CN108585283B - Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals - Google Patents

Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals Download PDF

Info

Publication number
CN108585283B
CN108585283B CN201810477028.2A CN201810477028A CN108585283B CN 108585283 B CN108585283 B CN 108585283B CN 201810477028 A CN201810477028 A CN 201810477028A CN 108585283 B CN108585283 B CN 108585283B
Authority
CN
China
Prior art keywords
water
hydroxyl radical
mechanical pump
concentration
water outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810477028.2A
Other languages
Chinese (zh)
Other versions
CN108585283A (en
Inventor
白敏冬
余忆玄
张芝涛
田一平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen University
Original Assignee
Xiamen University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen University filed Critical Xiamen University
Priority to CN201810477028.2A priority Critical patent/CN108585283B/en
Publication of CN108585283A publication Critical patent/CN108585283A/en
Application granted granted Critical
Publication of CN108585283B publication Critical patent/CN108585283B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical

Abstract

The system is provided with a hydroxyl free radical strong oxidation pretreatment system, a hydroxyl free radical mineralized organic pollutant system, a sodium hypochlorite disinfection unit, a central control system, a residual chlorine on-line monitor, a coagulating sedimentation tank, a sand filter tank, a clean water tank, a sodium hypochlorite storage tank, a mechanical pump, a controller, a water flow meter, an electromagnetic valve and a unit water outlet valve; the hydroxyl radical strong oxidation pretreatment system is provided with a hydroxyl radical strong oxidation pretreatment device, a1 st water jet cavitation liquid dissolving device and a1 st residual chlorine on-line monitor; the hydroxyl radical mineralized organic pollutant system comprises a hydroxyl radical mineralized organic pollutant device, a No. 2 water jet cavitation liquid dissolving device and a No. 2 residual chlorine on-line monitor.

Description

Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals
Technical Field
The invention relates to water bloom microalgae and organic pollutant treatment, in particular to a system and a method for treating water bloom microalgae and mineralized organic pollutants by using hydroxyl radicals.
Background
Lake water or river reservoir area water is an important surface water drinking water source in China, with the development of economy, the nutrient salt load of the surface water drinking water source is increasing day by day, and the rise of main pollution indexes such as chemical oxygen demand, total phosphorus, ammonia nitrogen and the like in the water body causes the massive propagation of algae in spring and summer. In recent years, large freshwater lakes such as Dian-Chin, Chaohu and Taihu lake in China are basically in eutrophication state. A great deal of water bloom in lakes explodes, the water body is fishy and smelly and dark brown, the water quality is further deteriorated due to the death of algae, and a great deal of organic pollutants such as algal toxins and the like are released, so that the water supply safety of urban drinking water is seriously threatened.
At present, most of water plants in China adopt a water purification process of coagulation, precipitation, filtration and chlorine disinfection. However, when the algae grow in a burst phase, the algae cells may secrete soluble organic substances extracellularly. The substances secreted by the algae mainly comprise nitrogen-containing substances and pentose gum substances, and complex compounds formed by the substances and ferric salt, aluminum salt and the like in a coagulant are suspended in water in a coagulating sedimentation stage, so that the destabilization is not facilitated, and the algae cannot be effectively precipitated. The algae in the water still pass through the coagulating sedimentation tankCan reach 105About cells/mL, the high density algae then enter the filter, easily causing the filter to block. It follows that the traditional "coagulation-sedimentation-filtration-chlorine disinfection" approach does not kill and remove algae well. In addition, algal toxins and secondary metabolites such as smelly substances generated by algae are chemically stable, and are difficult to be oxidatively degraded by a conventional chlorine disinfection process. Oxidative removal of odorants 2-MIB from water by plum blossom, Majun, Chenloyalty forest, et al [ J]The research on KMnO found in the Proc of Nature science of Heilongjiang university, 2007,24(01):76-804、H2O2And a disinfectant such as NaClO, and the like can hardly degrade the 2-methylisoborneol by oxidation.
The related patents of China for high algae drinking water have been reported as follows.
Chinese patent CN106044875A discloses a method and a system for treating high algae content water, which uses a method of adding different filter materials to filter high algae content water, but the method requires frequent membrane replacement and is relatively high in cost. Chinese patent CN104176839A discloses a treatment system using membrane treatment and powdered activated carbon addition, but the used membrane needs chemical cleaning, and the added powdered activated carbon adsorbed on the membrane surface may also aggravate membrane pollution. Chinese patent CN104925920A discloses a method for enhancing algae killing by physicochemical treatment, wherein copper salt and chlorine are added before pretreatment, chlorine free radical can destroy the integrity of algae cell wall, and copper ions act on cytoplasm. However, disruption of the algal cell wall can cause spillage of solutes within the algae, releasing algal toxins. Chinese patent CN101948153A discloses an ultrasonic-ultraviolet coupling pretreatment device for high algae-laden raw water, but the treatment capacity of the method is only 3m3And/h, the application of a tap water plant is difficult to realize.
Comprehensive analysis is carried out by adopting a high algae water treatment technology, and although the physical method cannot cause the rupture of algae cells to release intracellular solutes, the filter membrane needs to be replaced frequently, so that the cost is higher. Although the traditional chemical method can effectively kill algae, secondary pollution is easily caused, and toxic disinfection byproducts are generated. Hydroxyl free radicals generated by advanced oxidation technologies such as an ultraviolet method and the like can quickly kill algae mineralized organic pollutants, but most advanced oxidation technologies have small water treatment capacity and cannot realize large-scale application of water plants. Therefore, emergency water supply technical equipment is researched and developed, high algae and mineralized organic pollutants are killed safely and effectively, domestic water of the masses is guaranteed, and the emergency water supply device has important significance for maintaining social stability.
Disclosure of Invention
The invention aims to provide a system and a method for treating water bloom microalgae and mineralized organic pollutants by using hydroxyl radicals.
The device is provided with a hydroxyl radical strong oxidation pretreatment system, a hydroxyl radical mineralization organic pollutant system, a sodium hypochlorite disinfection unit, a central control system, a residual chlorine on-line monitor, a coagulating sedimentation tank, a sand filter tank, a clean water tank, a sodium hypochlorite storage tank, a mechanical pump, a controller, a water flow meter, an electromagnetic valve and a unit water outlet valve;
the hydroxyl radical strong oxidation pretreatment system is provided with a hydroxyl radical strong oxidation pretreatment device, a1 st water jet cavitation liquid dissolving device and a1 st residual chlorine on-line monitor;
the hydroxyl radical mineralization organic pollutant system comprises a hydroxyl radical mineralization organic pollutant device, a No. 2 water jet cavitation liquid dissolving device and a No. 2 residual chlorine on-line monitor;
the hydroxyl radical strong oxidation pretreatment device and the technical equipment for mineralizing organic pollutants are provided with an atmospheric pressure ionization discharge oxygen plasma integrated source, a partition excitation type high-frequency high-voltage power supply, a Venturi gas-liquid mixing and dissolving device, a booster pump, a decompression buffer, a bag filter and cooling water circulating equipment;
the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are provided with 5 venturi ejectors connected in parallel, the main water inlets of the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are connected with a water delivery main pipeline, the side water inlets of the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are connected with the water outlet of high-concentration hydroxyl radical generating equipment, and the 1-5 venturi ejectors can be selectively opened to process 300-500 m3The high algae-laden water is used for mixing and dissolving the high-concentration hydroxyl radical solution and the high-efficiency liquid of the treated water;
the sodium hypochlorite disinfection unit is provided with a sodium hypochlorite storage tank, a 5 th residual chlorine on-line monitor, a 9 th electromagnetic valve, a 7 th mechanical pump, a 4 th controller and a 3 rd flow meter; the sodium hypochlorite disinfection unit can realize the automatic feeding of a sodium hypochlorite solution, inactivate bacteria, viruses and protozoa in water, control the regrowth of microorganisms in the water delivery and distribution process and inhibit the growth of a pipe wall biomembrane.
And the central control system automatically adjusts the concentration and the injection amount of the oxygen active particles generated in the plasma integrated source according to the detection results returned by the residual chlorine on-line monitor, such as parameters of algae concentration, Chemical Oxygen Demand (COD), pH, turbidity and the like, so as to realize the automatic control of the concentration of the hydroxyl radical solution in the high-concentration hydroxyl radical generating equipment. In addition, the central control system can control the opening and closing of the electromagnetic valve in the system, the opening and closing of the mechanical pump and the opening and closing of the sodium hypochlorite disinfection unit are controlled through the controller, and automatic control in the running process of the whole treatment equipment is realized.
The water inlet of the 1 st mechanical pump of main treatment pipeline is connected to pending water source water, be equipped with the 1 st solenoid valve between pending water source water and the 1 st mechanical pump, the 1 st water flowmeter water inlet is connected to the delivery port of the 1 st mechanical pump, the 1 st water flowmeter delivery port connects the water inlet of the 1 st chlorine residue on-line monitoring appearance, the 1 st chlorine residue on-line monitoring appearance delivery port divide into two the tunnel, connect the 2 nd mechanical pump water inlet all the way, the 2 nd mechanical pump is equipped with the 1 st controller, be equipped with the 2 nd solenoid valve and the 1 st unit outlet valve between the 1 st chlorine residue on-line monitoring appearance and the 2 nd mechanical pump, the 2 nd mechanical pump water outlet connects the main water inlet of the 1 st cavitation liquid water jet cavitation liquid dissolving device among the hydroxyl radical strong oxidation water jet pretreatment systems, the 1 st water jet cavitation liquid water jet dissolving device water outlet connects the.
The water outlet of the 2 nd residual chlorine on-line monitor is connected with the water inlet of the coagulating sedimentation tank; the other path of the water outlet of the 1 st residual chlorine on-line monitor is directly connected with the water inlet of the coagulating sedimentation tank, a 3 rd electromagnetic valve is arranged between the water outlet of the 1 st residual chlorine on-line monitor and the water inlet of the coagulating sedimentation tank, and a2 nd unit water outlet valve is arranged between the water outlet of the hydroxyl radical strong oxidation pretreatment system and the water inlet of the coagulating sedimentation tank.
The water outlet of the coagulating sedimentation tank is connected with the water inlet of the 3 rd mechanical pump, and a 4 th electromagnetic valve is arranged between the water outlet of the coagulating sedimentation tank and the water inlet of the 3 rd mechanical pump. The water outlet of the 3 rd mechanical pump is connected with the water inlet of the sand filter, the water outlet of the sand filter is connected with the water inlet of the 5 th mechanical pump, the water outlet of the 5 th mechanical pump is connected with the water inlet of the 3 rd residual chlorine on-line monitor, and a 3 rd unit water outlet valve is arranged between the water outlet of the 5 th mechanical pump and the 3 rd residual chlorine on-line monitor. The water outlet of the 3 rd residual chlorine on-line monitor is divided into two paths, one path is connected with the water inlet of the 4 th mechanical pump, the water outlet of the 4 th mechanical pump is connected with the main water inlet of the 1 st water jet cavitation liquid dissolving device in the hydroxyl radical mineralization organic pollutant system, the water outlet of the 1 st water jet cavitation liquid dissolving device is connected with the water inlet of the 4 th residual chlorine on-line monitor, and the water outlet of the 4 th residual chlorine on-line monitor is connected with a water treatment main pipeline; the other path of the water outlet of the No. 3 residual chlorine on-line monitor is directly connected with a clean water tank through a water treatment main pipeline. A 6 th electromagnetic valve is arranged between the water outlet of the 3 rd residual chlorine on-line monitor and the water inlet of the clean water tank, and a 4 th unit water outlet valve is arranged between the water outlet of the hydroxyl radical mineralization organic pollutant system and the water inlet of the clean water tank.
Be equipped with sodium hypochlorite disinfection unit between hydroxyl radical mineralize mineralization organic pollutant system delivery port and the clean water basin water inlet, the delivery port of sodium hypochlorite storage jar is connected the surplus chlorine on-line monitoring appearance water inlet of 5 th, is equipped with 9 th solenoid valve, 7 th mechanical pump and 3 rd water flowmeter between the surplus chlorine on-line monitoring appearance delivery port of 5 th and the water treatment main line in proper order, and central control system passes through opening of 4 th controller control 7 th mechanical pump.
A water treatment branch pipeline is divided from a water treatment main pipeline between the water outlet of the sand filter tank and the water inlet of the clean water tank and used for preparing high-concentration hydroxyl radical solution, the water treatment branch pipeline is connected with the water inlet of a2 nd water flowmeter, the water outlet of the 2 nd water flowmeter is connected with the water inlet of a 6 th mechanical pump, the water outlet of the 6 th mechanical pump of the branch pipeline is divided into two paths, one path is connected with the water inlet of a hydroxyl radical strong oxidation pretreatment device in a hydroxyl radical strong oxidation pretreatment system, and the water outlet of the hydroxyl radical strong oxidation pretreatment device is connected with the branch water inlet of a1 st water jet cavitation liquid dissolving device; the other path of the water outlet of the 6 th mechanical pump of the branch pipeline is connected with a water inlet of a hydroxyl radical mineralization organic pollutant device in the hydroxyl radical mineralization organic pollutant equipment, and a water outlet of the hydroxyl radical mineralization organic pollutant device is connected with a branch water inlet of the 1 st water jet cavitation liquid dissolving device.
The water outlet of the clean water tank is connected with the water inlet of the 8 th mechanical pump, a 5 th unit water outlet valve and a 10 th electromagnetic valve are arranged between the water outlet of the clean water tank and the water inlet of the 8 th mechanical pump, and the water outlet of the 8 th mechanical pump is connected with a pipe network.
The method for efficiently killing the water bloom microalgae and mineralized organic pollutants by using the hydroxyl radicals comprises the following steps:
1) opening the 1 st electromagnetic valve and the 1 st mechanical pump of the main pipeline, sucking the water source water to be treated, controlling the water flow through the 1 st water flow meter, detecting the water source water by the 1 st residual chlorine on-line monitor, and feeding back the detection result to the central processing system. When the density of algae is detected to be higher than 1000cells/mL, starting a hydroxyl radical strong oxidation pretreatment system, determining the dosage of a hydroxyl radical solution to be added by a central control system according to parameters such as the concentration of the algae, COD (chemical oxygen demand), water turbidity and the like, sending a signal to a hydroxyl radical strong oxidation pretreatment device, when the density of algae is detected to be lower than 1000cells/mL, not starting the hydroxyl radical strong oxidation pretreatment system, closing the 2 nd electromagnetic valve, starting the 3 rd electromagnetic valve, directly pumping source water into a coagulation sedimentation tank, wherein the water flow in the main pipeline is 300-500 m3/h；
2) The method for efficiently preparing the hydroxyl radical solution by the hydroxyl radical strong oxidation pretreatment equipment comprises the following steps: opening oxygen active group gas generating equipment in hydroxyl radical strong oxidation pretreatment equipment, introducing oxygen in an oxygen cylinder into a plasma generating module, starting a subarea excitation high-frequency high-voltage power supply corresponding to the plasma module, forming atmospheric pressure ionization discharge in an extremely narrow discharge gap, ionizing and dissociating the oxygen to generate high-concentration oxygen active group gas, wherein the generation amount of the high-concentration oxygen active group gas is controlled by the number of the started plasma module; opening a 7 th electromagnetic valve corresponding to a branch pipeline water flow path of a branch pipeline 6 th mechanical pump and the hydroxyl radical strong oxidation pretreatment system, controlling the water flow of the branch pipeline through a2 nd water flow meter, pumping part of sand-filtered water into the hydroxyl radical strong oxidation pretreatment system through the 6 th mechanical pump, and removing impurities in the water through a bag filter; pumping the filtered water into a gas-liquid mixing and dissolving device through a booster pump; the hydroxyl radical solution after gas-liquid mixing enters a decompression buffer, the pressure at the outlet end of the gas-liquid mixing equipment is reduced through the decompression buffer, the hydrodynamic cavitation effect of the gas-liquid mixing of the oxygen active radical gas and the water solution is enhanced, the reaction time of the contact collision of the burst micro bubbles and the water is prolonged, extreme reaction conditions are provided for the plasma chemical reaction for generating the hydroxyl radical, and the high-concentration hydroxyl radical solution is prepared;
in the step 1), the aperture of the bag filter can be 20-50 μm, and the bag filter is used for filtering organic suspended matters and particles in a water body and reducing the consumption of water turbidity to hydroxyl radicals; the oxygen flux of the hydroxyl radical strong oxidation pretreatment device is 8-10 m3The concentration of oxygen active groups generated by atmospheric pressure electric field discharge is 100-300 mg/L, the generation amount of oxygen active group gas is 200-400 g/h, and the water flow of sand filter water entering the water jet cavitation liquid dissolving device>40m3H, through efficient gas-liquid mixing and dissolving equipment, generating a high-concentration hydroxyl radical solution by the oxygen active group gas through a radical chain reaction in water, wherein the total oxidant concentration is 10-20 mg/L, and the power of the whole machine is less than 20 kW;
3) starting a solenoid valve corresponding to the hydroxyl radical strong oxidation pretreatment equipment through a central control system, enabling source water in a main pipeline to enter a main water inlet of a1 st water jet cavitation liquid dissolving device, carrying out full mixing reaction with a high-concentration hydroxyl radical solution sucked from a side water inlet of the 1 st water jet cavitation liquid dissolving device, and detecting the total oxidant concentration in the pipeline by a2 nd residual chlorine on-line monitor; and opening the water taking valve of the unit 2, and detecting the water after the hydroxyl radical strong oxidation treatment. Hydroxyl free radicals can effectively kill plankton, pathogens and the like in water source water and improve the water quality condition;
in step 3), the 1 st water jet cavitation liquid-liquid dissolving device can be1-5 Venturi ejectors are selectively started according to the treatment capacity of water to be treated, and the water flow is 300-500 m3The reaction time of liquid-liquid mixing and dissolving is 6-20 s, and the total oxidant concentration is 1.0-2.0 mg/L. The negative pressure jetting effect of the Venturi ejector generates violent shock waves, micro jet flow and water flow stirring, the efficient mixing and dissolution of the hydroxyl radical solution and the water to be treated are promoted, the contact collision probability and efficiency of the hydroxyl radical solution and algae, pathogenic microorganisms and organic pollutants are greatly improved, and the efficient killing of the algae and the microorganisms and the oxidative degradation of organic matters by the hydroxyl radical solution are ensured. The total algae density after the pretreatment of the high algae water is less than 500cells/mL, no disinfection by-products are generated, and the water quality index reaches the standard of more than national surface water III.
4) The water after the strong oxidation pretreatment of the hydroxyl radicals enters a coagulating sedimentation tank, a coagulant is added into the coagulating sedimentation tank, colloid and fine suspended matters which are difficult to settle in the water are removed through the actions of compressing a double electric layer, adsorbing-electric neutralization, adsorbing-bridging, settling net catching and the like, and the coagulating sedimentation tank adopts a grid structure, so that the flocculating agent has the advantages of short flocculating time, good flocculating effect and simple structure;
in the step 4), the coagulation sedimentation tank is in a horizontal flow type, the plane of the tank body is rectangular, the inlet and the outlet are respectively arranged at two ends of the tank length, the tank length is 107.4m, the width is 16.5m, the height is 4.0m, and the distance between the liquid level and the top is 0.40 m. The hydraulic load on the surface of the coagulating sedimentation tank is 1.0-2.0 m3/(m2H), the hydraulic retention time is 160-180 min. The designed adding amount of the coagulant is 15-20 mg/L, the stirring speed is 48-73 r/min, and the turbidity of precipitated water is not more than 3.0NTU after the regulation is stable.
5) Opening a 4 th electromagnetic valve, pumping the water after coagulating sedimentation into a sand filter through a 3 rd mechanical pump, removing suspended substances and colloid in the water through the actions of resistance interception, gravity sedimentation, physical adsorption and the like, wherein the suspended substances with larger particle diameter are mainly removed on the upper layer of the filter through the action of resistance interception; suspended particles and colloid with smaller particle size are removed mainly through gravity settling and physical adsorption on the lower layer of the filter bed, and a water taking valve of the unit 3 is opened to detect the water after sand filtration;
in step 5), filtering of the sand filterThe height of the bed can be 1.2m, the bed is mainly formed by filling quartz sand with the particle diameter of 0.9-1.2 mm, a single-layer uniform-particle filter material is adopted from top to bottom, and the non-uniform coefficient k80Less than 1.3; the cross-sectional area of the filter bed is 78m2The filtration speed is designed to be 7-10 m/h.
6) When the density of algae in the raw water is higher than 1000cells/mL, a hydroxyl radical mineralization organic pollutant system is started through a central control system for further treating micro-polluted organic matters possibly generated in the water body;
7) the specific operation steps of the device for mineralizing the organic pollutants by the hydroxyl radicals in the system for mineralizing the organic pollutants by the hydroxyl radicals are the same as the step 2).
In the step 7), the hydroxyl radical mineralization organic pollutant device is controlled by the number of the plasma modules, the amount of the generated oxygen active radical gas generated by ionizing and dissociating oxygen through atmospheric pressure ionization discharge is controlled by the number of the plasma modules, and the oxygen flux is 5-8 m3The concentration of the oxygen active group gas is 100-300 mg/L, and the generation amount of the oxygen active group gas is 100-300 g/h. Water flow of sand filter water entering hydroxyl radical mineralization organic pollutant device>40m3And h, through efficient gas-liquid mixing and dissolving equipment, generating a high-concentration hydroxyl radical solution by the oxygen active group gas through a radical chain reaction in water, wherein the total oxidant concentration is 5-15 mg/L, and the power of the whole machine is less than 20 kW.
8) And (3) opening a 5 th electromagnetic valve corresponding to the hydroxyl radical mineralization organic pollutant system in the main pipeline through the central control system, closing a 6 th electromagnetic valve, and enabling the sand filtered water in the main pipeline to enter a main water inlet of the 1 st water jet cavitation liquid dissolving device and to be subjected to full mixing reaction with a high-concentration hydroxyl radical solution sucked from a side water inlet of the 1 st water jet cavitation liquid dissolving device. And 4, measuring the concentration of the total oxidant in the pipeline by using the residual chlorine on-line monitor. Opening the water intake valve of the 4 th unit, oxidizing and degrading organic pollutants such as algal toxins, smelly substances and the like by hydroxyl radical, and sterilizing;
in the step 8), the 1 st water jet cavitation liquid dissolving device can selectively start 1 to 5 Venturi ejectors according to the treatment capacity of water to be treated, and the water flow is 300 to 500m3H, liquid-liquid mixing reactionThe time is 6-20 s, and the total oxidant concentration is 0.3-1.0 mg/L. The negative pressure jetting effect of the Venturi ejector generates violent shock waves, micro jet flow and water flow stirring, the efficient mixing of the hydroxyl radical solution and the water to be treated is promoted, the extreme reaction conditions of high temperature and high pressure are generated immediately after the cavitation bubbles break, the reaction rate of the hydroxyl radical for oxidizing and degrading the organic pollutants is greatly improved, the mineralization of the organic pollutants is ensured, and the sterilization and disinfection are simultaneously carried out. The treated microcystin is not detected, and has odor substances of 2-MIB and GSM less than 10ng/L, no foreign odor and odor, and color intensity<5 degree, turbidity drop less than 0.3NTU, CODMnLess than 1.0mg/L, no biotoxicity, no disinfection by-product, and all indexes of water quality can reach the national sanitary Standard for Drinking Water (GB 5749-2006).
9) When the density of algae in the water source water is lower than 1000cells/mL, a conventional water treatment process is adopted, the 5 th electromagnetic valve corresponding to the hydroxyl radical mineralization organic pollutant system is closed through the central control system 1, the 6 th electromagnetic valve is opened, and the sodium hypochlorite disinfection unit is started. The central control system starts a 9 th electromagnetic valve of the sodium hypochlorite disinfection unit, starts a 7 th mechanical pump through a 4 th controller, regulates and controls the adding amount of sodium hypochlorite, and pumps sodium hypochlorite mother liquor from a sodium hypochlorite storage tank into a main pipeline to disinfect and sterilize sand filtration effluent;
in the step 9), the concentration of the sodium hypochlorite mother liquor can be 100-120 g/L, and the adding amount of the mother liquor is controlled to be 5-10 m3The concentration is 1.6-1.7 mg/L, and the concentration of the residual chlorine in the factory water is controlled to be 0.3 mg/L.
10) And the drinking water treated by the hydroxyl radicals or the sodium hypochlorite enters a clean water tank, and the clean water tank is used for adjusting the flow difference between the water production amount and the water supply amount of the pump station. And opening the water taking valve of the unit 5, and detecting the water sample after the disinfection treatment. And when the index of the treated drinking water reaches the national sanitary Standard for Drinking Water (GB5749-2006), the 8 th mechanical pump and the 10 th electromagnetic valve are started, and the treated water flowing through the clean water tank is introduced into a pipe network for residents to use.
The invention utilizes the high-concentration hydroxyl radical solution prepared by atmospheric pressure ionization discharge to quickly and efficiently kill the microalgae bloom, mineralizes micro-polluted organic pollutants, does not generate disinfection byproducts, and improves the water quality condition. All indexes of the treated drinking water reach the national sanitary Standard for Drinking Water (GB 5749-2006).
The invention combines the conventional water treatment process of a drinking water plant, and 5 treatment modules of OH strong oxidation pretreatment, coagulating sedimentation, sand filtration, OH mineralized organic pollutants and a clean water tank are arranged between source water and a water supply network.
The invention has the following technical effects and advantages:
1) the daily treatment capacity of the high algae drinking water of a single hydroxyl radical technical equipment is 12000 tons/day, and a treatment system comprises: the method comprises the steps of high algae source water, OH strong oxidation pretreatment, coagulating sedimentation, sand filtration, OH mineralization of organic pollutants, a clean water tank and a pipe network, can solve safe water supply for 150 thousands of people/day, and ensures that each index of the treated drinking water reaches the sanitary standard of drinking water (GB 5749-2006);
2) the technical equipment for the integrated OH strong oxidation pretreatment and mineralization of organic pollutants regulates and controls the generation amount of oxygen active group gas by starting the number of modular array plasma integrated sources, and the concentration of the oxygen active group gas generated by atmospheric pressure ionization discharge is 100-300 mg/L; the concentration of the prepared hydroxyl free radical solution is 5-20 mg/L, and the maximum treatment capacity for treating the high algae drinking water is 500 tons/hour; the equipment can realize full-automatic control, the power of the whole machine is less than 20kW, the operation cost is only increased by 0.01-0.02 RMB/ton water, the volume of the container is 3.5m multiplied by 1.5m multiplied by 2m, and the container can be transported on a vehicle.
3) The water jet cavitation liquid dissolving device generates violent shock waves, micro jet and water flow stirring under the negative pressure jetting action of the Venturi ejector, promotes the efficient mixing and dissolution of the hydroxyl radical solution and the water to be treated, greatly improves the contact collision probability and efficiency of the hydroxyl radical and algae, pathogenic microorganisms and organic pollutants, and ensures that the hydroxyl radical can efficiently kill the algae and the microorganisms and oxidize and degrade organic matters; the maximum water flow of the equipment is 500m3The device occupies 1/20 with only conventional miscibility technology between voids.
4) OH strong oxidation to kill the algal bloom: injecting an OH solution into a pipeline for transporting high algae drinking water, wherein the treatment time is 6-20 s, the adding dosage of the OH solution is 1.0-2.0 mg/L, and the total algae density after the high algae water is pretreated is reduced to 500cells/mL, so that the total algae density reaches the standard of the national surface water class III;
5) OH mineralized organic pollutants: injecting an OH solution into a pipeline for transporting high-algae drinking water, wherein the treatment time is 6-20 s, the adding dosage of the OH solution is 0.3-1.0 mg/L, the treated microcystin-LC is not detected, and odor substances 2-MIB and GSM are less than 10 ng/L;
6) the disinfection by-products after OH treatment, such as bromate, formaldehyde, chlorite, chlorate, halogenated alkane, haloacetic acid, haloacetaldehyde, chlorophenol and other organic halides, were not detected;
7) OH can kill pathogenic microorganisms in drinking water without any peculiar smell, peculiar smell and chromaticity<5 degrees, turbidity less than 0.3NTU and organic comprehensive index CODMnLess than 1.0mg/L, no biological toxicity, and various indexes after OH treatment reach sanitary Standard for Drinking Water (GB 5749-2006).
Drawings
FIG. 1 is a flow chart of a combined treatment system for efficiently killing water bloom microalgae and mineralized organic pollutants by treating 12000 tons of hydroxyl radicals daily.
FIG. 2 is a chromatogram of OH oxidative degradation of MC-LR.
FIG. 3 is a chromatogram of OH oxidative degradation of 2-MIB.
FIG. 4 is a chromatogram of OH oxidative degradation of GSM.
Detailed Description
The following examples will further illustrate the present invention with reference to the accompanying drawings.
Referring to fig. 1, the embodiment of the invention is provided with a hydroxyl radical strong oxidation pretreatment system A, a hydroxyl radical mineralization organic pollutant system B, a sodium hypochlorite disinfection unit C, a central control system 1, residual chlorine on-line monitors 21-25, a coagulation sedimentation tank 3, a sand filter tank 4, a clean water tank 5, a sodium hypochlorite storage tank 6, mechanical pumps 71-78, controllers 81-84, water flow meters 91-93, electromagnetic valves 101-1010 and unit water outlet valves 111-115.
The hydroxyl radical strong oxidation pretreatment system A is provided with a hydroxyl radical strong oxidation pretreatment device A1, a1 st water jet cavitation liquid dissolving device A2 and a1 st residual chlorine on-line monitor 22.
The hydroxyl radical mineralized organic pollutant system B comprises a hydroxyl radical mineralized organic pollutant device B1, a No. 2 water jet cavitation liquid dissolving device B2 and a No. 2 residual chlorine on-line monitor 24.
The hydroxyl radical strong oxidation pretreatment device A1 and the mineralized organic pollutant technical equipment B1 are provided with an atmospheric pressure ionization discharge oxygen plasma integrated source, a subarea excitation type high-frequency high-voltage power supply, a Venturi gas-liquid mixing and dissolving device, a booster pump, a decompression buffer, a bag filter and cooling water circulation equipment.
The 1 st water jet cavitation liquid dissolving device A2 and the 2 nd water jet cavitation liquid dissolving device B2 are provided with 5 venturi ejectors connected in parallel, the main water inlets of the 1 st water jet cavitation liquid dissolving device A2 and the 2 nd water jet cavitation liquid dissolving device B2 are connected with a water delivery main pipeline, the side water inlets of the 1 st water jet cavitation liquid dissolving device A2 and the 2 nd water jet cavitation liquid dissolving device B2 are connected with the water outlet of high-concentration hydroxyl radical generating equipment, and the 1-5 venturi ejectors capable of processing 300-500 m3The/h high algae-laden water is used for mixing and dissolving the high-concentration hydroxyl radical solution and the high-efficiency liquid of the treated water.
The sodium hypochlorite disinfection unit C is provided with a sodium hypochlorite storage tank 6, a 5 th residual chlorine on-line monitor 25, a 9 th electromagnetic valve 109, a 7 th mechanical pump 77, a 4 th controller 84 and a 3 rd flow meter 93; the sodium hypochlorite disinfection unit C can realize the automatic feeding of a sodium hypochlorite solution, inactivate bacteria, viruses and protozoa in water, control the regrowth of microorganisms in the water delivery and distribution process and inhibit the growth of a pipe wall biomembrane.
The central control system 1 automatically adjusts the concentration and the injection amount of the oxygen active particles generated in the plasma integrated source according to the detection results returned by the residual chlorine on-line monitor, such as parameters of algae concentration, Chemical Oxygen Demand (COD), pH, turbidity and the like, and realizes the automatic control of the concentration of the hydroxyl radical solution in the high-concentration hydroxyl radical generating equipment. In addition, central control system 1 can the opening and closing of solenoid valve among the control system, through the opening and closing of controller control mechanical pump, the opening and closing of sodium hypochlorite disinfection unit realize whole treatment equipment automatic control in the operation process.
The water source water to be treated is connected with the water inlet of a1 st mechanical pump 71 of a main treatment pipeline, a1 st electromagnetic valve 101 is arranged between the water source water to be treated and the 1 st mechanical pump 71, the water outlet of the 1 st mechanical pump 71 is connected with the water inlet of a1 st water flowmeter 91, the water outlet of the 1 st water flowmeter 91 is connected with the water inlet of a1 st residual chlorine on-line monitor 21, the water outlet of the 1 st residual chlorine on-line monitor 21 is divided into two paths, one path is connected with the water inlet of a2 nd mechanical pump 72, the 2 nd mechanical pump 72 is provided with a1 st controller 81, a2 nd electromagnetic valve 102 and a1 st unit water outlet valve 111 are arranged between the 1 st residual chlorine on-line monitor 21 and the 2 nd mechanical pump 72, the water outlet of the 2 nd mechanical pump 72 is connected with the main water inlet of a1 st water jet cavitation liquid dissolving device A2 in the hydroxyl radical strong oxidation pretreatment system A, the water jet cavitation liquid,
the water outlet of the 2 nd residual chlorine on-line monitor 22 is connected with the water inlet of the coagulating sedimentation tank; the other path of the water outlet of the 1 st residual chlorine on-line monitor 21 is directly connected with the water inlet of the coagulating sedimentation tank 3, a 3 rd electromagnetic valve 103 is arranged between the water outlet of the 1 st residual chlorine on-line monitor 21 and the water inlet of the coagulating sedimentation tank 3, and a2 nd unit water outlet valve 112 is arranged between the water outlet of the hydroxyl radical strong oxidation pretreatment system A and the water inlet of the coagulating sedimentation tank 3.
The water outlet of the coagulating sedimentation tank 3 is connected with the water inlet of the 3 rd mechanical pump 73, and a 4 th electromagnetic valve 104 is arranged between the water outlet of the coagulating sedimentation tank 3 and the water inlet of the 3 rd mechanical pump 73. The water outlet of the 3 rd mechanical pump 73 is connected with the water inlet of the sand filter 4, the water outlet of the sand filter 4 is connected with the water inlet of the 5 th mechanical pump 75, the water outlet of the 5 th mechanical pump 75 is connected with the water inlet of the 3 rd residual chlorine on-line monitor 23, and a 3 rd unit water outlet valve 113 is arranged between the water outlet of the 5 th mechanical pump 75 and the 3 rd residual chlorine on-line monitor 23. The water outlet of the 3 rd residual chlorine on-line monitor 23 is divided into two paths, one path is connected with the water inlet of a 4 th mechanical pump 74, the water outlet of the 4 th mechanical pump 74 is connected with the main water inlet of a1 st water jet cavitation liquid dissolving device B2 in the hydroxyl radical mineralization organic pollutant system B, the water outlet of the 1 st water jet cavitation liquid dissolving device B2 is connected with the water inlet of a 4 th residual chlorine on-line monitor 24, and the water outlet of the 4 th residual chlorine on-line monitor 24 is connected with a water treatment main pipeline; the other path of the water outlet of the 3 rd residual chlorine on-line monitor 23 is directly connected with the clean water tank 5 through a water treatment main pipeline. A 6 th electromagnetic valve 106 is arranged between the water outlet of the 3 rd residual chlorine on-line monitor 23 and the water inlet of the clean water tank 5, and a 4 th unit water outlet valve 114 is arranged between the water outlet of the hydroxyl radical mineralization organic pollutant system B and the water inlet of the clean water tank 5.
And a sodium hypochlorite disinfection unit C is arranged between the water outlet of the hydroxyl radical mineralization organic pollutant system B and the water inlet of the clean water tank 5. The water outlet of the sodium hypochlorite storage tank 6 is connected with the water inlet of the 5 th residual chlorine on-line monitor 25, a 9 th electromagnetic valve 109, a 7 th mechanical pump 77 and a 3 rd water flow meter 93 are sequentially arranged between the water outlet of the 5 th residual chlorine on-line monitor 25 and a water treatment main pipeline, and the central control system 1 controls the opening of the 7 th mechanical pump 77 through the 4 th controller 84.
And one branch of the water treatment main pipeline between the water outlet of the sand filter 4 and the water inlet of the clean water tank 5 is a water treatment branch pipeline and is used for preparing high-concentration hydroxyl radical solution. The water treatment branch pipeline is connected with the water inlet of the 2 nd water flow meter 92, and the water outlet of the 2 nd water flow meter 92 is connected with the water inlet of the 6 th mechanical pump 76. The water outlet of the 6 th mechanical pump 76 of the branch pipeline is divided into two paths, one path is connected with the water inlet of a hydroxyl radical strong oxidation pretreatment device A1 in the hydroxyl radical strong oxidation pretreatment system A, and the water outlet of a hydroxyl radical strong oxidation pretreatment device A1 is connected with the branch water inlet of a1 st water jet cavitation liquid dissolving device A2; the other path of the water outlet of the 6 th mechanical pump 76 of the branch pipeline is connected with the water inlet of a hydroxyl radical mineralization organic pollutant device B1 in the equipment B, and the water outlet of a hydroxyl radical mineralization organic pollutant device B1 is connected with the branch water inlet of a1 st water jet cavitation liquid dissolution device B2.
The water outlet of the clean water tank 5 is connected with the water inlet of the 8 th mechanical pump 78, a 5 th unit water outlet valve 115 and a 10 th electromagnetic valve 1010 are arranged between the water outlet of the clean water tank 5 and the water inlet of the 8 th mechanical pump 78, and the water outlet of the 8 th mechanical pump 78 is connected with a pipe network.
The method for efficiently killing the water bloom microalgae and mineralized organic pollutants by using the hydroxyl radicals comprises the following steps:
1) the 1 st electromagnetic valve 101 and the 1 st mechanical pump 71 of the main pipeline are opened, the source water to be treated is sucked, and the water flow rate is controlled by the 1 st water flow meter 91. The water source water is detected by a1 st residual chlorine on-line monitor 21, and the detection result is fed back to the central processing system 1. When the density of the algae is detected to be higher than 1000cells/mL, the hydroxyl radical strong oxidation pretreatment system A is started, the central control system 1 determines the dosage of the hydroxyl radical solution to be added according to the parameters of the algae concentration, COD, water turbidity and the like, and sends a signal to the hydroxyl radical strong oxidation pretreatment device A1. When the density of the algae is detected to be lower than 1000cells/mL, the hydroxyl radical strong oxidation pretreatment system A is not started, the 2 nd electromagnetic valve 102 is closed, the 3 rd electromagnetic valve 103 is opened, and the source water is directly pumped into the coagulating sedimentation tank 3. The water flow in the main pipeline is 300-500 m3/h。
2) The method for efficiently preparing the hydroxyl radical solution by the hydroxyl radical strong oxidation pretreatment equipment comprises the following steps: opening an oxygen active group gas generating device A1 in hydroxyl radical strong oxidation pretreatment equipment, introducing oxygen in an oxygen cylinder into a plasma generating module, starting a subarea excitation high-frequency high-voltage power supply corresponding to the plasma module, forming atmospheric pressure ionization discharge in an extremely narrow discharge gap, ionizing and dissociating the oxygen to generate high-concentration oxygen active group gas, wherein the generation amount of the oxygen active group gas is controlled by the number of the started plasma module; secondly, opening a 7 th electromagnetic valve 107 corresponding to a branch pipeline water flow path of the branch pipeline 6 th mechanical pump 76 and the hydroxyl radical strong oxidation pretreatment system, controlling the water flow of the branch pipeline through a2 nd water flow meter 92, pumping part of sand-filtered water into a hydroxyl radical strong oxidation pretreatment system A1 through the 6 th mechanical pump 76, and removing impurities in the water through a bag filter; pumping the filtered water into a gas-liquid mixing and dissolving device through a booster pump; and fourthly, the hydroxyl radical solution after gas-liquid mixing enters a decompression buffer, the pressure at the outlet end of the gas-liquid mixing equipment is reduced through the decompression buffer, the hydrodynamic cavitation effect of the gas-liquid mixing of the oxygen active radical gas and the water solution is enhanced, the reaction time of the contact collision of the burst micro bubbles and the water is prolonged, extreme reaction conditions are provided for the plasma chemical reaction for generating the hydroxyl radical, and the high-concentration hydroxyl radical solution is prepared.
The aperture of the bag filter is 20-50 microns, and the bag filter is used for filtering organic suspended matters and particles in a water body and reducing the consumption of hydroxyl radicals caused by water turbidity; the oxygen flux of the hydroxyl radical strong oxidation pretreatment device is 8-10 m3The concentration of oxygen active groups generated by atmospheric pressure electric field discharge is 100-300 mg/L, the generation amount of oxygen active group gas is 200-400 g/h, and the water flow of sand filter water entering the water jet cavitation liquid dissolving device>40m3And h, through efficient gas-liquid mixing and dissolving equipment, generating a high-concentration hydroxyl radical solution by the oxygen active group gas through a radical chain reaction in water, wherein the total oxidant concentration is 10-20 mg/L, and the power of the whole machine is less than 20 kW.
3) The electromagnetic valve corresponding to the hydroxyl radical strong oxidation pretreatment device A1 is opened through the central control system 1, water source water in the main pipeline enters the main water inlet of the 1 st water jet cavitation liquid dissolving device A2 and is subjected to full mixing reaction with the high-concentration hydroxyl radical solution sucked from the side water inlet of the 1 st water jet cavitation liquid dissolving device A2. The 2 nd on-line residual chlorine monitor 22 detects the total oxidant concentration in the pipeline. And opening the water taking valve 112 of the unit 2, and detecting the water after the hydroxyl radical strong oxidation treatment. The hydroxyl free radicals can effectively kill plankton, pathogens and the like in the source water and improve the water quality.
The 1 st water jet cavitation liquid dissolving device A2 can selectively open 1-5 Venturi ejectors according to the treatment capacity of water to be treated, and the water flow is 300-500 m3The reaction time of liquid-liquid mixing and dissolving is 6-20 s, and the total oxidant concentration is 1.0-2.0 mg/L. The negative pressure jetting effect of the Venturi ejector generates violent shock waves, micro jet flow and water flow stirring, the efficient mixing and dissolution of the hydroxyl radical solution and the water to be treated are promoted, the contact collision probability and efficiency of the hydroxyl radical solution and algae, pathogenic microorganisms and organic pollutants are greatly improved, and the efficient killing of the algae and the microorganisms and the oxidative degradation of organic matters by the hydroxyl radical solution are ensured. The total algae density after the pretreatment of the high algae water is less than 500cells/mL, no disinfection by-products are generated, and the water quality index reaches the standard of more than national surface water III.
4) The water after the strong oxidation pretreatment of the hydroxyl free radicals enters a coagulating sedimentation tank 3. Adding a coagulant into a coagulating sedimentation tank, and removing colloid and fine suspended matters which are difficult to settle in water through the actions of double electric layer compression, adsorption-electric neutralization, adsorption-bridging, sediment net catching and the like. The coagulating sedimentation tank adopts a grid structure, and has the advantages of short flocculation time, good flocculation effect and simple structure.
The coagulation sedimentation tank is in a horizontal flow type, the plane of the tank body is rectangular, an inlet and an outlet are respectively arranged at two ends of the tank length, the tank length is 107.4m, the width is 16.5m, the height is 4.0m, and the distance between the liquid level and the top is 0.40 m. The hydraulic load on the surface of the coagulating sedimentation tank is 1.0-2.0 m3/(m2H), the hydraulic retention time is 160-180 min. The designed adding amount of the coagulant is 15-20 mg/L, the stirring speed is 48-73 r/min, and the turbidity of precipitated water is not more than 3.0NTU after the regulation is stable.
5) And opening the 4 th electromagnetic valve 104, pumping the water after coagulating sedimentation into the sand filter 4 through the 3 rd mechanical pump 73, and removing suspended substances and colloid in the water through the actions of resistance interception, gravity sedimentation, physical adsorption and the like. Suspended substances with larger particle diameters are mainly removed on the upper layer of the filter tank by the action of resistance interception; the suspended particles and colloids with small particle sizes are mainly removed by gravity sedimentation and physical adsorption in the lower layer of the filter bed. And opening the 3 rd unit water taking valve 113 to detect the water after sand filtration.
The height of a filter bed of the sand filter is 1.2m, the filter bed is mainly formed by filling quartz sand with the particle diameter of 0.9-1.2 mm, a single-layer uniform-particle filter material is adopted from top to bottom, and the non-uniform coefficient k80Less than 1.3; the cross-sectional area of the filter bed is 78m2The filtration speed is designed to be 7-10 m/h.
6) When the density of algae in the raw water is higher than 1000cells/mL, in order to further treat micro-polluted organic matters possibly generated in the water body, a hydroxyl radical mineralization organic pollutant system B is started through the central control system 1.
7) The specific operation steps of the hydroxyl radical mineralization organic pollutant device B1 in the hydroxyl radical mineralization organic pollutant system B are the same as the step 2).
The hydroxyl radical mineralized organicIn the pollutant device B1, the generation amount of oxygen active group gas generated by ionizing and dissociating oxygen through atmospheric pressure ionization discharge is controlled by the number of plasma modules, and the oxygen flux is 5-8 m3The concentration of the oxygen active group gas is 100-300 mg/L, and the generation amount of the oxygen active group gas is 100-300 g/h. Water flow of sand filter water entering hydroxyl radical mineralization organic pollutant device>40m3And h, through efficient gas-liquid mixing and dissolving equipment, generating a high-concentration hydroxyl radical solution by the oxygen active group gas through a radical chain reaction in water, wherein the total oxidant concentration is 5-15 mg/L, and the power of the whole machine is less than 20 kW.
8) The 5 th electromagnetic valve 105 corresponding to the hydroxyl radical mineralization organic pollutant system B in the main pipeline is opened through the central control system 1, the 6 th electromagnetic valve 106 is closed, the sand filtered water in the main pipeline enters the main water inlet of the 1 st water jet cavitation liquid dissolving device B2 and is subjected to full mixing reaction with the high-concentration hydroxyl radical solution sucked from the side water inlet of the 1 st water jet cavitation liquid dissolving device B2. The 4 th residual chlorine on-line monitor 24 measures the total oxidant concentration in the pipeline. And (4) opening the water taking valve 114 of the unit 4, oxidizing and degrading organic pollutants such as algal toxins and smelly substances by hydroxyl radical, and sterilizing and disinfecting simultaneously.
The 1 st water jet cavitation liquid dissolving device B2 can selectively start 1-5 Venturi ejectors according to the treatment capacity of water to be treated, and the water flow is 300-500 m3The reaction time of liquid-liquid mixing and dissolving is 6-20 s, and the total oxidant concentration is 0.3-1.0 mg/L. The negative pressure jetting effect of the Venturi ejector generates violent shock waves, micro jet flow and water flow stirring, and the efficient mixing of the hydroxyl radical solution and the water to be treated is promoted. The cavitation bubble breaks the extreme reaction condition of high temperature and high pressure in the twinkling of an eye, raise the reaction rate that the hydroxyl radical oxidizes and degrades organic pollutant greatly, has guaranteed the mineralization of organic pollutant, sterilizes at the same time. The treated microcystin is not detected, and has odor substances of 2-MIB and GSM less than 10ng/L, no foreign odor and odor, and color intensity<5 degree, turbidity drop less than 0.3NTU, CODMnLess than 1.0mg/L, no biotoxicity, no disinfection by-product, and all indexes of water quality can reach the national sanitary Standard for Drinking Water (GB 5749-2006).
9) When the density of algae in the water source water is lower than 1000cells/mL, a conventional water treatment process is adopted, the 5 th electromagnetic valve 105 corresponding to the hydroxyl radical mineralization organic pollutant system B is closed through the central control system 1, the 6 th electromagnetic valve 106 is opened, and the sodium hypochlorite disinfection unit C is started. Central control system 1 opens the 9 th solenoid valve 109 of sodium hypochlorite disinfection unit, opens 7 th mechanical pump 77 through 4 th controller 84, regulates and control the volume of throwing of sodium hypochlorite, goes into the main pipeline with sodium hypochlorite mother liquor from sodium hypochlorite storage jar 6 pump to sand filtration goes out water disinfection and sterilization.
The concentration of the sodium hypochlorite mother liquor is 100-120 g/L, and the adding amount of the mother liquor is controlled to be 5-10 m3The concentration is 1.6-1.7 mg/L, and the concentration of the residual chlorine in the factory water is controlled to be 0.3 mg/L.
10) The drinking water treated by the hydroxyl radicals or the sodium hypochlorite enters a clean water tank 5, and the clean water tank 5 is used for adjusting the flow difference between the water production amount and the water supply amount of the pump station. And opening the water taking valve 115 of the unit 5, and detecting the water sample after the disinfection treatment. When the index of the treated drinking water reaches the national sanitary Standard for Drinking Water (GB5749-2006), the 8 th mechanical pump 78 and the 10 th electromagnetic valve 1010 are started, and the treated water flowing through the clean water tank is introduced into a pipe network for residents to use.
The invention utilizes the high-concentration hydroxyl radical solution prepared by atmospheric pressure ionization discharge to quickly and efficiently kill the microalgae bloom, mineralizes micro-polluted organic pollutants, does not generate disinfection byproducts, and improves the water quality condition. All indexes of the treated drinking water reach the national sanitary Standard for Drinking Water (GB 5749-2006).
The specific embodiment is as follows: the treatment capacity is 12000 tons/day, and the combined system for treating the high algae source water and the sand filtration precipitation effluent by using OH strong oxidation.
According to the method and the system, a 12000 ton/day hydroxyl free radical technology for efficiently killing the water bloom microalgae and mineralizing the organic pollutants and a treatment combined system are developed. The test site for 1.2 ten thousand ton/day high algae drinking water strong oxidation emergency treatment technical engineering demonstration is set in Anxiang flying Anshu factory in Xiamen city. The total algae density of the source water to be treated is 1.79 multiplied by 105cells/mL, wherein the microcystis, anabaena pseudobaena, anabaena, and,The density of Cyclotella algae and other algae is 1.75 × 105、1.73×103、8.10×102And 1.23X 103cells/mL, thus opening the hydroxyl radical strong oxidation pretreatment unit. The microcystin concentration of the sand filtration effluent is 8.6 mug/L; the concentrations of di-methylisoborneol and geosmin were 88.8 and 95.3ng/L, respectively, thus opening the hydroxyl radical mineralization organic contaminant unit. Water of a water source to be treated is pumped by a mechanical pump, the water treatment capacity of a main pipeline is 500 tons/hour, and the water flow of a branch pipeline flowing into the OH strong oxidation pretreatment unit and the OH mineralization organic pollutant unit is 55 tons/hour. The total oxidant concentration after the OH strong oxidation pretreatment unit and the main pipeline water are mixed and reacted in the treatment process is ensured to be 1.0mg/L, the total oxidant concentration after the OH mineralized organic pollutant unit is mixed and reacted is 0.5mg/L, and the treatment time is 20 s. And opening a unit water outlet valve for sampling, and detecting the processed water sample.
The combined system-OH strong oxidation and disinfection treatment process has the algae killing condition shown in Table 1. The cell death and viability are identified by a SYTOX Green fluorescent staining microscope. The cell membrane permeability of dead algae cells is changed, and SYTOX Green dye macromolecules can enter the cells and emit Green fluorescence under the excitation of 488 nm. The cell membrane of the survival algae seed cell is intact, dye macromolecules can not enter the cell body, green fluorescence can not be emitted under the excitation of 488nm, and only chlorophyll spontaneous red fluorescence is presented, so that the death and the survival of the algae cell can be judged. The total algae density in the high algae source water is 1.79 multiplied by 105cells/mL, after adopting OH strong oxidation treatment for 20s, only 250cells/mL microcystis and a small amount of other algae survive, and the rest algae are all dead, thereby meeting the water requirement of water plants for entering the plant. After the sand filtration effluent is subjected to OH strong oxidation treatment, algae cells are completely killed.
TABLE 1
Figure BDA0001664734710000131
The oxidative degradation of organic pollutants by the OH disinfection process is shown in FIGS. 2-4. The adding concentration of the total oxidant in the sand filtered water is 0.5mg/L, and after the sand filtered water is treated for 20s, the concentration of the microcystins is lower than the detection limit. The degradation rates of smelly substances 2-methylisoborneol and geosmin after OH disinfection treatment are 91% and 96%, respectively, and the concentration after treatment is lower than 10ng/L, so that the product reaches the sanitary Standard for Drinking Water (GB5749-2006) in China.
The strong OH oxidation and disinfection by-products from the disinfection process are shown in Table 2. In the treated water sample, disinfection byproducts such as chlorite, bromate, formaldehyde, tribromomethane, dichloromethane, 1, 2-dichloroethane, 1,1, 1-trichloroethane, dichloroacetic acid, trichloroacetic acid, 2,4, 6-trichlorophenol, halogenated alkane and the like are not detected, which indicates that the risk of generating the disinfection byproducts is lower when OH is adopted for oxidizing the drinking water.
TABLE 2
Figure BDA0001664734710000141
The water quality of the OH strong oxidation and disinfection process is shown in Table 3. In a source water and sand filtration effluent treatment test, after OH strong oxidation treatment is carried out for 20s, the total number of bacteria, total coliform bacteria, faecal coliform bacteria and escherichia coli in water have obvious killing effects, and the indexes of the four types of bacteria all reach the national drinking water standard. Other water quality indexes of source water and sand filtered water before and after treatment are not obviously changed, and the water quality indexes are free of biotoxicity, and can reach the national sanitary Standard for Drinking Water (GB 5749-2006).
TABLE 3
Figure BDA0001664734710000142
Figure BDA0001664734710000151
In conclusion, the OH strong oxidation process is adopted to treat the high algae source water, algae can be killed rapidly and efficiently, meanwhile, organic pollutants are oxidized, degraded and mineralized, no disinfection byproducts are generated, indexes of microbiology, sensory properties and the like of the treated drinking water reach the national sanitary standard for drinking water (GB5749-2006), the water body has no biotoxicity, the water quality safety of the drinking water is effectively guaranteed, and the research result can provide technical support for the safe supply of the drinking water in the high algae source area in China.

Claims (8)

1. The system is characterized by being provided with a hydroxyl radical strong oxidation pretreatment system, a hydroxyl radical mineralized organic pollutant system, a sodium hypochlorite disinfection unit, a central control system, a residual chlorine on-line monitor, a coagulating sedimentation tank, a sand filter tank, a clean water tank, a sodium hypochlorite storage tank, a mechanical pump, a controller, a water flow meter, an electromagnetic valve and a unit water outlet valve;
the hydroxyl radical strong oxidation pretreatment system is provided with a hydroxyl radical strong oxidation pretreatment device, a1 st water jet cavitation liquid dissolving device and a1 st residual chlorine on-line monitor;
the hydroxyl radical mineralization organic pollutant system is provided with a hydroxyl radical mineralization organic pollutant device, a No. 2 water jet cavitation liquid dissolving device and a No. 2 residual chlorine on-line monitor;
the hydroxyl radical strong oxidation pretreatment device and the technical equipment for mineralizing organic pollutants are provided with an atmospheric pressure ionization discharge oxygen plasma integrated source, a partition excitation type high-frequency high-voltage power supply, a Venturi gas-liquid mixing and dissolving device, a booster pump, a decompression buffer, a bag filter and cooling water circulating equipment;
the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are provided with 5 venturi ejectors which are connected in parallel, main water inlets of the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are connected with a main water delivery pipeline, and side water inlets of the 1 st water jet cavitation liquid dissolving device and the 2 nd water jet cavitation liquid dissolving device are connected with a water outlet of high-concentration hydroxyl radical generating equipment and are used for mixing and dissolving a high-concentration hydroxyl radical solution and a high-efficiency liquid of treated water;
the sodium hypochlorite disinfection unit is provided with a sodium hypochlorite storage tank, a 5 th residual chlorine on-line monitor, a 9 th electromagnetic valve, a 7 th mechanical pump, a 4 th controller and a 3 rd flow meter; the sodium hypochlorite disinfection unit realizes the automatic feeding of a sodium hypochlorite solution, inactivates bacteria, viruses and protozoa in water, controls the regrowth of microorganisms in the water delivery and distribution process and inhibits the growth of a pipe wall biomembrane;
the central control system automatically adjusts the concentration and the injection amount of the oxygen active particles generated in the plasma integrated source according to the detection result returned by the residual chlorine on-line monitor, wherein the detection result is parameters of algae concentration, Chemical Oxygen Demand (COD), pH and turbidity, and the automatic control of the concentration of the hydroxyl radical solution in the high-concentration hydroxyl radical generating equipment is realized; the central control system can control the opening and closing of the electromagnetic valve in the system, and the opening and closing of the mechanical pump and the opening and closing of the sodium hypochlorite disinfection unit are controlled by the controller, so that the automatic control in the operation process of the whole treatment equipment is realized;
the water source water to be treated is connected with a water inlet of a1 st mechanical pump of a main treatment pipeline, a1 st electromagnetic valve is arranged between the water source water to be treated and the 1 st mechanical pump, a water outlet of the 1 st mechanical pump is connected with a water inlet of a1 st water flow meter, a water outlet of the 1 st water flow meter is connected with a water inlet of a1 st residual chlorine on-line monitor, a water outlet of the 1 st residual chlorine on-line monitor is divided into two paths, one path is connected with a water inlet of a2 nd mechanical pump, the 2 nd mechanical pump is provided with a1 st controller, a2 nd electromagnetic valve and a1 st unit water outlet valve are arranged between the 1 st residual chlorine on-line monitor and the 2 nd mechanical pump, a water outlet of the 2 nd mechanical pump is connected with a main water inlet of a1 st cavitation liquid water jet flow dissolving device in a hydroxyl;
the water outlet of the 2 nd residual chlorine on-line monitor is connected with the water inlet of the coagulating sedimentation tank; the other path of the water outlet of the 1 st residual chlorine on-line monitor is directly connected with the water inlet of the coagulating sedimentation tank, a 3 rd electromagnetic valve is arranged between the water outlet of the 1 st residual chlorine on-line monitor and the water inlet of the coagulating sedimentation tank, and a2 nd unit water outlet valve is arranged between the water outlet of the hydroxyl radical strong oxidation pretreatment system and the water inlet of the coagulating sedimentation tank;
the water outlet of the coagulation sedimentation tank is connected with the water inlet of a 3 rd mechanical pump, a 4 th electromagnetic valve is arranged between the water outlet of the coagulation sedimentation tank and the water inlet of the 3 rd mechanical pump, the water outlet of the 3 rd mechanical pump is connected with the water inlet of a sand filter, the water outlet of the sand filter is connected with the water inlet of a 5 th mechanical pump, the water outlet of the 5 th mechanical pump is connected with the water inlet of a 3 rd residual chlorine on-line monitor, a 3 rd unit water outlet valve is arranged between the water outlet of the 5 th mechanical pump and the 3 rd residual chlorine on-line monitor, the water outlet of the 3 rd residual chlorine on-line monitor is divided into two paths, one path is connected with the water inlet of the 4 th mechanical pump, the water outlet of the 4 th mechanical pump is connected with a main water inlet of a1 st water jet cavitation liquid dissolving device in a hydroxyl radical mineralization organic pollutant system, the water outlet; the other path of the water outlet of the No. 3 residual chlorine on-line monitor is directly connected with a clean water tank through a water treatment main pipeline; a 6 th electromagnetic valve is arranged between the water outlet of the 3 rd residual chlorine on-line monitor and the water inlet of the clean water tank, and a 4 th unit water outlet valve is arranged between the water outlet of the hydroxyl radical mineralization organic pollutant system and the water inlet of the clean water tank;
a sodium hypochlorite disinfection unit is arranged between the water outlet of the hydroxyl radical mineralization organic pollutant system and the water inlet of the clean water tank, the water outlet of a sodium hypochlorite storage tank is connected with the water inlet of a 5 th residual chlorine on-line monitor, a 9 th electromagnetic valve, a 7 th mechanical pump and a 3 rd water flow meter are sequentially arranged between the water outlet of the 5 th residual chlorine on-line monitor and a water treatment main pipeline, and the central control system controls the opening of the 7 th mechanical pump through a 4 th controller;
a water treatment branch pipeline is divided from a water treatment main pipeline between the water outlet of the sand filter tank and the water inlet of the clean water tank and used for preparing high-concentration hydroxyl radical solution, the water treatment branch pipeline is connected with the water inlet of a2 nd water flowmeter, the water outlet of the 2 nd water flowmeter is connected with the water inlet of a 6 th mechanical pump, the water outlet of the 6 th mechanical pump of the branch pipeline is divided into two paths, one path is connected with the water inlet of a hydroxyl radical strong oxidation pretreatment device in a hydroxyl radical strong oxidation pretreatment system, and the water outlet of the hydroxyl radical strong oxidation pretreatment device is connected with the branch water inlet of a1 st water jet cavitation liquid dissolving device; the other path of the water outlet of the 6 th mechanical pump of the branch pipeline is connected with a water inlet of a hydroxyl radical mineralization organic pollutant device in the hydroxyl radical mineralization organic pollutant equipment, and a water outlet of the hydroxyl radical mineralization organic pollutant device is connected with a branch water inlet of the 1 st water jet cavitation liquid dissolving device;
the water outlet of the clean water tank is connected with the water inlet of the 8 th mechanical pump, a 5 th unit water outlet valve and a 10 th electromagnetic valve are arranged between the water outlet of the clean water tank and the water inlet of the 8 th mechanical pump, and the water outlet of the 8 th mechanical pump is connected with a pipe network.
2. The method for efficiently killing the water bloom microalgae and the mineralized organic pollutants by using the hydroxyl radicals is characterized in that the method for killing the water bloom microalgae and the mineralized organic pollutants by using the hydroxyl radicals comprises the following steps:
1) opening a1 st electromagnetic valve and a1 st mechanical pump of the main pipeline, sucking source water to be treated, controlling the water flow through a1 st water flow meter, detecting the source water by a1 st residual chlorine on-line monitor, and feeding back a detection result to a central processing system; when the density of algae is detected to be higher than 1000cells/mL, starting a hydroxyl radical strong oxidation pretreatment system, determining the dosage of a hydroxyl radical solution to be added by a central control system according to parameters of algae concentration, COD and water turbidity, sending a signal to a hydroxyl radical strong oxidation pretreatment device, when the density of algae is detected to be lower than 1000cells/mL, not starting the hydroxyl radical strong oxidation pretreatment system, closing a2 nd electromagnetic valve, starting a 3 rd electromagnetic valve, directly pumping source water into a coagulation sedimentation tank, wherein the water flow in a main pipeline is 300-500 m3/h；
2) The method for efficiently preparing the hydroxyl radical solution by the hydroxyl radical strong oxidation pretreatment equipment comprises the following steps:
opening oxygen active group gas generating equipment in a hydroxyl radical strong oxidation pretreatment device, introducing oxygen in an oxygen cylinder into a plasma generating module, starting a subarea excitation high-frequency high-voltage power supply corresponding to the plasma module, forming atmospheric pressure ionization discharge in an extremely narrow discharge gap, ionizing and dissociating the oxygen to generate high-concentration oxygen active group gas, wherein the generation amount of the high-concentration oxygen active group gas is controlled by the number of the started plasma modules;
opening a 7 th electromagnetic valve corresponding to a branch pipeline water flow path of a branch pipeline 6 th mechanical pump and the hydroxyl radical strong oxidation pretreatment system, controlling the water flow of the branch pipeline through a2 nd water flow meter, pumping part of sand-filtered water into the hydroxyl radical strong oxidation pretreatment system through the 6 th mechanical pump, and removing impurities in the water through a bag filter;
pumping the filtered water into a gas-liquid mixing and dissolving device through a booster pump;
the hydroxyl radical solution after gas-liquid mixing enters a decompression buffer, the pressure at the outlet end of the gas-liquid mixing equipment is reduced through the decompression buffer, the hydrodynamic cavitation effect of the gas-liquid mixing of the oxygen active radical gas and the water solution is enhanced, the reaction time of the contact collision of the burst micro bubbles and the water is prolonged, extreme reaction conditions are provided for the plasma chemical reaction for generating the hydroxyl radical, and the high-concentration hydroxyl radical solution is prepared;
3) starting a solenoid valve corresponding to the hydroxyl radical strong oxidation pretreatment equipment through a central control system, enabling source water in a main pipeline to enter a main water inlet of a1 st water jet cavitation liquid dissolving device, carrying out full mixing reaction with a high-concentration hydroxyl radical solution sucked from a side water inlet of the 1 st water jet cavitation liquid dissolving device, and detecting the total oxidant concentration in the pipeline by a2 nd residual chlorine on-line monitor; opening the water intake valve of the unit 2, detecting the water after the strong oxidation treatment of the hydroxyl radicals, and efficiently killing plankton and pathogens in the source water by the hydroxyl radicals to improve the water quality condition;
the 1 st water jet cavitation liquid dissolving device selectively opens 1-5 Venturi ejectors according to the treatment capacity of water to be treated, and the water flow is 300-500 m3The reaction time of liquid-liquid mixing and dissolving is 6-20 s, and the concentration of the total oxidant is 1.0-2.0 mg/L; the negative pressure jetting effect of the Venturi ejector generates violent shock waves, micro jet flow and water flow stirring, promotes the efficient mixing and dissolution of the hydroxyl radical solution and the water to be treated, greatly improves the contact collision probability and efficiency of the hydroxyl radical solution and algae, pathogenic microorganisms and organic pollutants, ensures that the hydroxyl radical solution can efficiently kill the algae and the microorganisms and oxidize and degrade organic matters, and ensures that the total algae density after the high algae water pretreatment is less than 500cells/mL,no disinfection by-product is generated, and the water quality index reaches the national standard of surface water above III class;
4) water after the strong oxidation pretreatment of hydroxyl radicals enters a coagulating sedimentation tank, a coagulant is added into the coagulating sedimentation tank, colloid and fine suspended matters which are difficult to settle in the water are removed through the actions of compressing a double electric layer, adsorption-electric neutralization, adsorption-bridging and sediment net catching, and the coagulating sedimentation tank adopts a grid structure;
5) opening a 4 th electromagnetic valve, pumping the water after coagulating sedimentation into a sand filter through a 3 rd mechanical pump, removing suspended substances and colloid in the water through resistance interception, gravity sedimentation and physical adsorption, wherein the suspended substances with larger particle diameter are mainly removed on the upper layer of the filter through the action of resistance interception; suspended particles and colloid with smaller particle size are removed mainly through gravity settling and physical adsorption on the lower layer of the filter bed, and a water taking valve of the unit 3 is opened to detect the water after sand filtration;
6) when the density of algae in raw water is higher than 1000cells/mL, a hydroxyl radical mineralization organic pollutant system is started through a central control system;
7) the specific operation steps of the device for mineralizing the organic pollutants by the hydroxyl radicals in the system for mineralizing the organic pollutants by the hydroxyl radicals are the same as the step 2);
8) opening a 5 th electromagnetic valve corresponding to a hydroxyl radical mineralization organic pollutant system in the main pipeline through a central control system, closing a 6 th electromagnetic valve, enabling sand-filtered water in the main pipeline to enter a main water inlet of a1 st water jet cavitation liquid dissolving device, carrying out full mixing reaction with a high-concentration hydroxyl radical solution sucked from a side water inlet of the 1 st water jet cavitation liquid dissolving device, detecting the concentration of a total oxidant in the pipeline by a 4 th residual chlorine online monitor, opening a 4 th unit water taking valve, oxidizing and degrading algal toxins and smelling substance organic pollutants by hydroxyl radicals, and sterilizing and disinfecting simultaneously;
the 1 st water jet cavitation liquid dissolving device selectively opens 1-5 Venturi ejectors according to the treatment capacity of water to be treated, and the water flow is 300-500 m3The reaction time of liquid-liquid mixing and dissolving is 6-20 s, and the concentration of the total oxidant is 0.3-1.0 mg/L; after treatment, the microcystin is not detected, and the smelling substances 2-MIB andGSM < 10ng/L, no foreign odor and odor, and chroma<5 degree, turbidity drop less than 0.3NTU, CODMnLess than 1.0mg/L, no biotoxicity, no disinfection by-product, and all indexes of water quality reaching the national sanitary Standard for Drinking Water;
9) when the density of algae in water source water is lower than 1000cells/mL, adopting a conventional water treatment process, closing a 5 th electromagnetic valve corresponding to a hydroxyl radical mineralization organic pollutant system through a central control system 1, opening a 6 th electromagnetic valve, starting a sodium hypochlorite disinfection unit, opening a 9 th electromagnetic valve of the sodium hypochlorite disinfection unit through the central control system, opening a 7 th mechanical pump through a 4 th controller, regulating and controlling the adding amount of sodium hypochlorite, and pumping sodium hypochlorite mother liquor into a main pipeline from a sodium hypochlorite storage tank to disinfect and sterilize sand filtration effluent;
10) the drinking water treated by the hydroxyl radicals or the sodium hypochlorite enters a clean water tank, the clean water tank is used for adjusting the flow difference between the water production amount and the water supply amount of a pump station, a 5 th unit water taking valve is opened, and a water sample after the disinfection treatment is detected; and when the index of the treated drinking water reaches the national sanitary Standard for Drinking Water, the 8 th mechanical pump and the 10 th electromagnetic valve are started, and the treated water flowing through the clean water tank is introduced into a pipe network for residents to use.
3. The method for efficiently killing water bloom microalgae and mineralized organic pollutants by using the hydroxyl radicals as claimed in claim 2, wherein in the step 2), the aperture of the bag filter is 20-50 μm, and the bag filter is used for filtering organic suspended matters and particulate matters in a water body and reducing the consumption of the hydroxyl radicals caused by water turbidity.
4. The method for efficiently killing water bloom microalgae and mineralized organic pollutants according to claim 2, wherein in the step 2), the oxygen flux of the hydroxyl radical strong oxidation pretreatment device is 8-10 m3The concentration of oxygen active groups generated by atmospheric pressure electric field discharge is 100-300 mg/L, the generation amount of oxygen active group gas is 200-400 g/h, and the water flow of sand filter water entering the water jet cavitation liquid dissolving device>40m3H, passing through efficient gas-liquid mixing and dissolving equipmentThe oxygen active group gas generates a high-concentration hydroxyl radical solution through a radical chain reaction in water, the total oxidant concentration is 10-20 mg/L, and the power of the whole machine is less than 20 kW.
5. The method for efficiently killing water bloom microalgae and mineralized organic pollutants by using hydroxyl radicals as claimed in claim 2, wherein in the step 4), the coagulation sedimentation tank is in a horizontal flow type, the plane of the tank body is rectangular, the inlet and the outlet are respectively arranged at two ends of the tank length, the tank length is 107.4m, the width is 16.5m, the height is 4.0m, the distance between the liquid surface and the top is 0.40m, and the hydraulic load on the surface of the coagulation sedimentation tank is 1.0-2.0 m3/(m2H), the hydraulic retention time is 160-180 min, the designed addition amount of a coagulant is 15-20 mg/L, the stirring speed is 48-73 r/min, and the turbidity of precipitated water is not more than 3.0NTU after the regulation is stable.
6. The method for efficiently killing algal bloom and mineralized organic pollutants by using hydroxyl radicals as claimed in claim 2, wherein in step 5), the height of the filter bed of the sand filter is 1.2m, the filter bed is mainly filled with quartz sand with the particle diameter of 0.9-1.2 mm, a single-layer uniform-particle filter material is adopted from top to bottom, and the non-uniform coefficient k is80Less than 1.3; the cross-sectional area of the filter bed is 78m2The filtration speed is designed to be 7-10 m/h.
7. The method for efficiently killing algal bloom microalgae and mineralized organic pollutants by using hydroxyl radicals as claimed in claim 2, wherein in the step 7), the amount of the generated oxygen active group gas generated by the hydroxyl radical mineralized organic pollutants device through ionization and dissociation of oxygen by atmospheric pressure ionization discharge is controlled by the number of the plasma modules, and the oxygen flux is 5-8 m3The concentration of the oxygen active group gas is 100-300 mg/L, and the generation amount of the oxygen active group gas is 100-300 g/h; water flow of sand filter water entering hydroxyl radical mineralization organic pollutant device>40m3H, through efficient gas-liquid mixing equipment, generating high-concentration hydroxyl radical solution through radical chain reaction of oxygen active group gas in water, wherein the total oxidant concentration is 5-15 mg/L, and the complete machine powerLess than 20 kW.
8. The method for efficiently killing water bloom microalgae and mineralized organic pollutants by using hydroxyl radicals as claimed in claim 2, wherein in the step 9), the concentration of the sodium hypochlorite mother liquor is 100-120 g/L, and the adding amount of the mother liquor is controlled to be 5-10 m3The concentration is 1.6-1.7 mg/L, and the concentration of the residual chlorine in the factory water is controlled to be 0.3 mg/L.
CN201810477028.2A 2018-05-18 2018-05-18 Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals Active CN108585283B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810477028.2A CN108585283B (en) 2018-05-18 2018-05-18 Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810477028.2A CN108585283B (en) 2018-05-18 2018-05-18 Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals

Publications (2)

Publication Number Publication Date
CN108585283A CN108585283A (en) 2018-09-28
CN108585283B true CN108585283B (en) 2020-12-01

Family

ID=63631816

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810477028.2A Active CN108585283B (en) 2018-05-18 2018-05-18 Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals

Country Status (1)

Country Link
CN (1) CN108585283B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109824176A (en) * 2019-03-30 2019-05-31 山东大学 A kind of device of Hydrodynamic cavitation combined oxidant degradation of dye waste water
CN109821434B (en) * 2019-03-30 2021-02-09 山东大学 Microbubble generating device under low-speed state
US11453603B2 (en) * 2019-06-28 2022-09-27 Crystal Lagoons Technologies, Inc. Low cost and sanitary efficient method that creates two different treatment zones in large water bodies to facilitate direct contact recreational activities
CN110921946A (en) * 2019-12-23 2020-03-27 北京工业大学 Small integrated organic wastewater treatment control system and control method thereof
CN111333170A (en) * 2020-03-20 2020-06-26 同济大学 Method for synchronously removing disinfection by-products and micropollutants in water
CN112299611A (en) * 2020-09-25 2021-02-02 葫芦岛废思盈环保科技有限公司 Wastewater treatment method and system
CN113857124A (en) * 2021-09-29 2021-12-31 安徽鲸洋生物科技有限公司 Water body cavitation equipment and water body cavitation method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104402140A (en) * 2014-11-14 2015-03-11 厦门大学 Method and apparatus for removal of earthy-musty smelly substances from water
CN107758927A (en) * 2017-11-23 2018-03-06 大连海事大学 A kind of advanced oxidation drinking water water preparation process optimizes checking system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104402140A (en) * 2014-11-14 2015-03-11 厦门大学 Method and apparatus for removal of earthy-musty smelly substances from water
CN107758927A (en) * 2017-11-23 2018-03-06 大连海事大学 A kind of advanced oxidation drinking water water preparation process optimizes checking system

Also Published As

Publication number Publication date
CN108585283A (en) 2018-09-28

Similar Documents

Publication Publication Date Title
CN108585283B (en) Processing system and method for killing water bloom microalgae and mineralizing organic pollutants by hydroxyl radicals
US11111165B2 (en) Process and apparatus for treating water
CN104310663B (en) Combined system for hydroxyl radical (.OH) strong oxidation treatment of high algae-laden water
KR100939442B1 (en) Algae removal method and the system which using the chlorine dioxide
CN106630279A (en) Pathogenic microorganism control device for recycling municipal sewage and operation method
CN202936278U (en) Comprehensive treatment device for ballast water
CN104326529B (en) A kind of hydroxyl radical free radical is processed the method and apparatus of high algae water
US20130277315A1 (en) Oxidation process
AU2009200113A1 (en) Water purification
CN108423883B (en) Method and device for degrading and mineralizing quinolone antibiotics by hydroxyl radicals
CN104591451B (en) A kind of tap water purifying processing system
CN104556509B (en) A kind of running water sterilization system based on membrane technology
CN108585285A (en) The processing system and its processing method of antibiotic in hydroxyl radical free radical mineralized drinking water
CN215161801U (en) Hydroxyl radical aqueous solution and drinking water supply system
CN215667580U (en) Direct drinking water purification treatment device
CN202936224U (en) Device capable of eliminating organics in water by collaborative processing of UV-irradiation and sodium hypochlorite
CN106746035A (en) A kind of drinking water algae-removing technology
JPH0427493A (en) Cleaning and sterilizing device for water and method for utilizing cleaned and sterilized water
CN112811708A (en) Direct drinking water purification treatment method and device
RU2315007C1 (en) Method of purification of the water from the harmful impurities and the installation for the method realization
CN206266303U (en) Urban sewage reutilization pathogenic microorganism control device
CN1477063A (en) Technique for purifying water of micropolluted water source by adopting ultrafiltration, jet-supplementing ozone and UV secondary excitation to produce free radical and process
CN216337170U (en) High-efficient preprocessing device of pharmacy waste water
CN205024040U (en) Medical treatment waste water treatment equipment
US20110284469A1 (en) Device and Method for Purifying a Liquid

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant