CN112707551A - Wastewater treatment system and method - Google Patents
Wastewater treatment system and method Download PDFInfo
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- CN112707551A CN112707551A CN202011504649.9A CN202011504649A CN112707551A CN 112707551 A CN112707551 A CN 112707551A CN 202011504649 A CN202011504649 A CN 202011504649A CN 112707551 A CN112707551 A CN 112707551A
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- 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
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- 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
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a wastewater treatment system which comprises a wastewater collection pool, an acid-base regulation pool, an electric flocculation pool, an electric catalysis pool and a membrane pool, wherein a water outlet of the wastewater collection pool is connected with the acid-base regulation pool, a water outlet of the acid-base regulation pool is connected with the electric flocculation pool, a water outlet of the point flocculation pool is connected with the electric catalysis pool, a water outlet of the electric catalysis pool is connected with the membrane pool, an adsorption material is filled in the membrane pool, and water in the membrane pool can flow back into the electric catalysis pool. The wastewater treatment system and the wastewater treatment method provided by the invention have a good wastewater treatment effect.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment system and a wastewater treatment method.
Background
In recent years, with the rapid development of chemical synthesis industry, the production wastewater of daily chemical industry is increasing day by day, and the wastewater in the industry contains a large amount of organic pollutants such as anionic surfactant (LAS), animal and vegetable oil, essence, pigment and the like, and has the characteristics of complex components, high pollutant concentration and poor biodegradability. The domestic chemical wastewater is discharged into natural water bodies such as rivers, lakes and the like without proper treatment, so that the content of dissolved oxygen in the water bodies is reduced, the water quality is deteriorated, the aesthetic feeling of the natural water body landscape is influenced, the biotoxicity of the domestic chemical wastewater directly threatens the survival of aquatic animals and plants, the aquatic ecosystem is seriously damaged, and the direct or indirect adverse effect on the survival of human beings is generated. Therefore, the method for treating the waste water of the daily chemical industry by an economic and effective method has important significance.
The treatment method of the daily chemical wastewater is various and mainly comprises a physical chemical method and a biological method according to different principles, wherein the physical chemical method comprises coagulation precipitation, adsorption separation, air flotation, iron-carbon micro-electrolysis, Fenton reagent oxidation, ozone oxidation, catalytic oxidation and the like; the biological method is mainly divided into aerobic biological treatment and anaerobic biological treatment according to the difference of microbial respiration modes, and in addition, various combined process technologies are used for treating daily chemical wastewater.
At present, the proposal of the 'emission standard of water pollutants for the cosmetic industry' is published, the pollutants such as COD, anionic surfactants, petroleum and the like in the wastewater produced by the daily chemical industry are definitely limited, and the emission limit values of the COD, the anionic surfactants and the petroleum of newly built enterprises are 100mg/L, 5mg/L and 5mg/L respectively. Therefore, the development of an economical and practical daily chemical wastewater treatment process technology and the solution of the problem of the discharge of the production wastewater in the daily chemical industry are significant.
Patents CN103183450B and CN202482169U propose similar treatment methods and devices for daily chemical wastewater, and the devices mainly include a fenton reaction tank, a sedimentation tank, a floatation tank, and a membrane bioreactor. The Fenton reaction tank is used for inputting daily chemical wastewater and treating the daily chemical wastewater by using a Fenton method. The sedimentation tank is connected with the Fenton reaction tank and used for inputting wastewater after the Fenton reaction and carrying out sedimentation. The air floatation tank is connected with the sedimentation tank and is used for inputting the supernatant of the sedimentation tank and separating oil particles and micro particles in the solution. The front end of the membrane bioreactor is an anaerobic tank, the rear end of the membrane bioreactor is an aerobic tank, and the membrane bioreactor is used for inputting the lower layer solution of the air flotation tank, outputting the lower layer solution after being treated by a biochemical method.
Patent CN105668916A provides a daily chemical industry wastewater treatment method and a pond with high treatment efficiency, which is characterized in that a water collecting pond, an acid-base adjusting pond, a Fenton reaction tank, an anaerobic reactor, an aerobic reactor and a filtering pond are sequentially connected, and the daily chemical industry wastewater is subjected to acid-base adjustment, Fenton reaction and biochemical treatment, so that toxic substances contained in the daily chemical industry wastewater can be effectively decomposed, and the method has the remarkable advantages of reasonable structure, stable work and the like.
Patent CN109626675A discloses a method for treating wastewater containing nonionic surfactant, which adopts a reinforced coagulation and electrochemical oxidation coupling treatment process to treat wastewater with the mass concentration of the nonionic surfactant of 200-500 mg/L, and has the characteristics of simple process, convenient equipment operation, short treatment time, excellent treatment effect and the like.
Patent CN209872639U provides a waste water pretreatment technique technology process pond, adopts the electricity flocculation to condense the photocatalysis technique promptly as the preliminary treatment, utilizes electricity flocculation earlier with surfactant active to coagulate the seizure, flocculates most surfactant active, then carries out mineralize mineralization oxidative decomposition remaining surfactant active to remaining surfactant active with photocatalysis for can degrade the surfactant active more than 98% through this department equipment, thoroughly solve the too much problem of foam in the surfactant active waste water treatment process.
Patent CN209974486U proposes a pool for treating wastewater containing various surfactants, said pool comprises four main water treatment pools including an acid-base adjusting pool, a coagulating pool, a sedimentation pool and an electrocatalytic oxidation pool, and further comprises a pump power system, a dosing system and a control system; the pool has the characteristics of mild reaction temperature, thorough pollutant degradation, stable treatment effect, high standard-reaching rate of effluent, no secondary pollution and compact structure.
The invention discloses a treatment method for removing anionic surfactants in domestic wastewater, which is characterized in that an anion-Hall effect separation tank is innovatively introduced, and daily chemical wastewater is sequentially treated efficiently through a water collecting well, a coarse grid, a primary sedimentation tank, a pH value adjusting tank, an anion-Hall effect separation tank, an aeration nitrification tank, a biological denitrification tank, a secondary sedimentation tank, a water purification tank and the like.
The invention of patent CN110590056A relates to and provides a surfactant wastewater treatment system and process based on a foamless oxygenation technology. The equipment system is provided with a flocculation sedimentation tank, a hydrolysis acidification tank, an aerobic tank, a membrane tank and a high-efficiency liquid-phase oxygenation system, the aerobic tank is innovatively oxygenated by the high-efficiency liquid-phase oxygenation system, so that the condition that a large amount of foam is generated by a surface active agent to influence the environment and take away sludge is avoided, sludge reduction is caused, the maintenance of the active sludge concentration of the aerobic biochemical system is facilitated, and the operation stability of the system is ensured.
The traditional treatment method is basically based on a physical chemical method or a biological method or a coupling process technology, and although the traditional single treatment technology has the advantages of simple operation, strong pertinence and the like, the problems of narrow application range, poor comprehensive treatment effect and the like exist, the coupling process technology is often adopted to realize effective treatment of wastewater, and the coupling process has the defects of high cost, complex technology, unstable treatment effect and the like, so that a novel daily chemical wastewater treatment technology needs to be developed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a wastewater treatment system and a wastewater treatment method with better wastewater treatment effect.
The invention provides a wastewater treatment system which comprises a wastewater collection pool, an acid-base regulation pool, an electric flocculation pool, an electric catalysis pool and a membrane pool, wherein a water outlet of the wastewater collection pool is connected with the acid-base regulation pool, a water outlet of the acid-base regulation pool is connected with the electric flocculation pool, a water outlet of the point flocculation pool is connected with the electric catalysis pool, a water outlet of the electric catalysis pool is connected with the membrane pool, an adsorption material is filled in the membrane pool, and water in the membrane pool can flow back into the electric catalysis pool.
Preferably, the adsorption material is one or more of bamboo charcoal, clay, polymer, nano material, activated carbon, particles and resin, and the adding amount of the adsorption material is 1-5% of the water amount of the membrane pool.
Preferably, a collecting tank water outlet device and an intelligent control device are arranged outside a water outlet of the wastewater collecting tank, the wastewater collecting tank is provided with a first high-low liquid level floating ball, the membrane tank is provided with a second high-low liquid level floating ball, and the intelligent control device is used for controlling the collecting tank water outlet device to be started when the position of the first high-low liquid level floating ball in the wastewater collecting tank is higher than a preset value and the position of the second high-low liquid level floating ball in the membrane tank is lower than the preset value; and/or the presence of a gas in the gas,
the intelligent control device is used for controlling the collecting tank water outlet device to stop starting when the position of the first high-low liquid level floating ball in the wastewater collecting tank is lower than a preset value or the position of the second high-low liquid level floating ball in the membrane tank is higher than the preset value.
Preferably, a plurality of electric flocculation pole plates are arranged in the electric flocculation pool, clamping groove type supports are arranged at the bottoms of the electric flocculation pole plates, the distance between every two adjacent electric flocculation pole plates is 10-40 mm, and the electric flocculation pole plates are iron plates or aluminum plates;
the electrocatalysis cell is provided with a plurality of electrocatalysis polar plates, the bottoms of the electrocatalysis polar plates are provided with clamping groove type supports, the distance between every two adjacent electrocatalysis polar plates is 10mm-40mm, and the electrocatalysis polar plates are titanium-based polar plates plated with iridium and/or ruthenium.
Preferably, the membrane pool comprises an external circulation system and a membrane separation assembly, the membrane separation assembly comprises a plurality of rows of hollow fiber membranes, two ends of each hollow fiber membrane are cast by epoxy resin, the lower ends of membrane wires of the hollow fiber membranes are sealed, the upper ends of the membrane wires are provided with holes and are connected with the external circulation system through pipelines, the external circulation system comprises a liquid suction system and a backwashing system, and the liquid suction system is provided with a suction water production pump, a first liquid flowmeter and a third valve; the backwashing system is provided with a cleaning pool, a backwashing pump, a second liquid flow meter and a second one-way valve; the hollow fiber membrane is selected from one or more of polyvinylidene fluoride membrane, polyacrylonitrile membrane and polysulfone membrane.
Preferably, the adsorption material is activated carbon, and water with activated carbon in the membrane tank can flow back to the electro-catalysis tank.
Preferably, the membrane pool is provided with a second high-low liquid level floating ball and a water production device for discharging water outwards, and when the position of the second high-low liquid level floating ball in the membrane pool is higher than a preset value, the water production device is started; when the position of the second high-low liquid level floating ball in the membrane pool is lower than a preset value, the water production device is closed; or the like, or, alternatively,
the membrane pool is provided with a water production device which discharges water outwards, the water production pump is provided with a time relay, and the water production device discharges water intermittently according to the preset time of the time relay.
Preferably, a fine grid is arranged at a water inlet of the wastewater collection tank, and a filter is arranged at a water outlet of the wastewater collection tank;
the acid-base adjusting tank is provided with an acid-base adjusting control cabinet, a stirring device, an acid-base testing probe and an automatic dosing device, and the bottom of the acid-base adjusting tank is also provided with a drain outlet of the adjusting tank;
the electric flocculation tank is provided with an electric flocculation drain, and the electric flocculation drain is arranged at the bottom of the electric flocculation tank.
A catalytic pool sewage outlet is formed in the bottom of the electro-catalytic pool;
the membrane tank is provided with a second water inlet, the position of the water outlet of the electric flocculation tank is higher than the position of the water outlet of the electric catalysis tank, and the position of the water outlet of the electric catalysis tank is higher than the position of the second water inlet;
the membrane tank is also provided with a bottom aeration system, and the aeration system consists of an air compressor, a gas flow meter, a third single valve, an aeration disc/an aeration pipe and a pipeline.
The invention provides a wastewater treatment method, which comprises the following steps:
(1) introducing wastewater into a wastewater collection tank;
(2) wastewater collected by the wastewater collection tank flows into an acid-base regulation tank for treatment;
(3) the effluent of the acid-base adjusting tank flows into an electric flocculation tank for treatment;
(4) the effluent of the electric flocculation tank flows into an electric catalysis tank for treatment;
(5) effluent of the electro-catalysis tank flows into a membrane tank for treatment, an adsorption material is filled in the membrane tank, and water in the membrane tank can flow back to the electro-catalysis tank.
Preferably, the electroflocculation time is 10-60 min; the time of the catalytic degradation of the electro-catalytic cell is 30-120 min.
The wastewater treatment system and the wastewater treatment method provided by the invention have a good wastewater treatment effect.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic view of a wastewater treatment system according to an embodiment of the present invention.
Wherein: 1-a wastewater collection tank; 2-acid-base adjusting tank; 3-an electric flocculation tank; 4-an electrocatalysis cell; 5-a membrane pool; 6-grating; 7-a first high-low liquid level floating ball; 8-a filter; 9-a self-priming pump; 10-a first one-way valve; 11-acid base test probe; 12-a stirring motor; 13-automatic dosing device; 14-acid-base regulation control cabinet; 15-a stirring device; 16-a first overflow port; 17-a sewage discharge outlet of the regulating tank, 18-a first valve and 19-a first water inlet; 20-a power supply; 21-an electroflocculation plate; 22-an electric flocculation sewage discharge outlet; 23-a filter press; 24-an electrocatalytic electrode plate; 25-a second overflow; 26-a sewage discharge outlet of the catalytic pool; 27-a third overflow; 28-a second water inlet; 29-aeration pan/aeration pipe; 30-a second high-low liquid level floating ball; 31-a second valve; 32-a sewage discharge outlet of the membrane tank; 33-a separation membrane module; 34-a second one-way valve; 35-a gas flow meter; 36-an air compressor; 37-pumping the water generating pump; 38-a first liquid flow meter; 39-pressure gauge; 40-a third valve; 41-reflux pump; 42-a fourth valve; 43-a cleaning tank; 44-backwash pump; 45-a second liquid flow meter; 46-third check valve.
Detailed Description
The technical solutions of the present invention are further described in detail with reference to specific examples so that those skilled in the art can better understand the present invention and can implement the present invention, but the examples are not intended to limit the present invention.
Referring to fig. 1, an embodiment of the present invention provides a wastewater treatment system, including a wastewater collection tank 1, an acid-base regulation tank 2, an electric flocculation tank 3, an electrocatalysis tank 4, and a membrane tank 5, wherein a water outlet of the wastewater collection tank 1 is connected to the acid-base regulation tank 2, a water outlet of the acid-base regulation tank 2 is connected to the electric flocculation tank 3, a water outlet of the point flocculation tank is connected to the electrocatalysis tank 4, a water outlet of the electrocatalysis tank 4 is connected to the membrane tank 5, an adsorption material is filled in the membrane tank 5, and water in the membrane tank 5 can flow back to the electrocatalysis tank 4. A reflux pump 41 and a fourth valve 42 are also arranged between the membrane pool 5 and the electro-catalysis pool 4, and the water flow of the membrane pool 5 which flows back to the electro-catalysis pool 4 can be controlled by arranging the reflux pump 41 and the fourth valve 42.
The effluent disposal system that this embodiment provided has coupled the electro-catalysis unit, and difficult degradation part in the effective degradation surfactant active combines the adsorption material in membrane cisterna 5 in addition, ensures quality of water safety, and through the water reflux that has adsorption material, forms a plurality of miniature catalytic unit at electro-catalysis pond 4, realizes adsorption and desorption of adsorption material, can effectively reduce the sludge amount at membrane cisterna 5 simultaneously.
The wastewater treatment system provided by the embodiment does not adopt a biochemical technology (the biochemical technology occupies a large area), and has the advantages of low treatment cost, small occupied area and good water production stability.
The waste water treatment system that this embodiment provided, it is better for conventional flocculation/sediment + membrane filtration technology water treatment.
The effluent disposal system that this embodiment provided to "electric flocculation/catalysis + membrane filtration" is the core treatment technology, and adsorption material can partly flow back to anterior segment electro-catalysis pond 4 in the membrane pond 5, forms a plurality of miniature catalytic unit, realizes that the degree of depth degradation of organic matter in the adsorption material and adsorption material realize regenerating, and the effluent disposal system that this embodiment provided has the running cost low, easy operation, and the sludge capacity is few, and the characteristics that LAS clearance is high.
The wastewater treatment system provided by the embodiment can realize high-efficiency and low-cost treatment of daily chemical wastewater and solve the problem that the daily chemical wastewater is difficult to treat. The wastewater treatment system provided by the embodiment is used for treating daily chemical wastewater in laboratories of daily chemical enterprises, the COD removal rate is more than or equal to 90%, and the surfactant can be completely removed, so that the wastewater treatment system has a good treatment effect.
In a preferred embodiment, the adsorption material is one or more of bamboo charcoal, clay, polymer, nano material, activated carbon, particles and resin, and activated carbon powder with lower cost is preferably selected, so that on one hand, the adsorption material has a better adsorption effect, and on the other hand, a better backflow effect can be realized, so that part of the activated carbon powder can flow back to the electro-catalysis cell 4 to form a plurality of micro-catalysis units, and deep degradation of organic matters in the activated carbon and regeneration of the activated carbon are realized. In a preferred embodiment, the amount of adsorbent material is added in the range of 1-5% of the water amount in the membrane tank 5.
In a preferred embodiment, a collecting tank water outlet device and an intelligent control device are arranged outside a water outlet of the wastewater collecting tank 1, the collecting tank water outlet device of the embodiment is a self-priming pump 9, the wastewater collecting tank 1 of the embodiment is provided with a first high-low liquid level floating ball 7, a second high-low liquid level floating ball 30 is arranged in the membrane tank 5, and the intelligent control device is used for controlling the self-priming pump 9 to start when the position of the first high-low liquid level floating ball 7 in the wastewater collecting tank 1 is higher than a preset value and the position of the second high-low liquid level floating ball 30 in the membrane tank 5 is lower than the preset value; and/or the presence of a gas in the gas,
the intelligent control device is used for controlling the water inlet device to stop starting when the position of the first high-low liquid level floating ball 7 in the wastewater collection tank 1 is lower than a preset value or the position of the second high-low liquid level floating ball 30 in the membrane tank 5 is higher than a preset value.
In this embodiment, set up height liquid level floater in waste water collecting pit 1 and the membrane cisterna 5 respectively, carry out chain control through intelligent control system (flow control device), ensure that the effluent disposal system of this embodiment can effectively prevent that waste water from accumulating too much in the collecting pit and spilling over, or the liquid level of membrane cisterna 5 is low so that separation membrane module 33 can't high-efficient operation. In this embodiment, when the liquid level of the membrane tank 5 is too high, the water inlet device is not started even if the liquid level of the collecting tank is high. The liquid level balance of the wastewater treatment system can be better realized. In a further preferred embodiment, the water inlet device is a water inlet pump.
In a preferred embodiment, a plurality of electric flocculation electrode plates 21 are arranged in the electric flocculation tank 3, a slot type bracket is arranged at the bottom of each electric flocculation electrode plate 21, the distance between every two adjacent electric flocculation electrode plates 21 is 10mm-40mm, each electric flocculation electrode plate 21 is an iron plate or an aluminum plate, and in a further preferred embodiment, the distance between every two adjacent electric flocculation electrode plates 21 is 20mm +/-2 mm.
In the preferred embodiment, the electro-catalytic cell 4 is provided with a plurality of electro-catalytic electrode plates 24, the bottom of the electro-catalytic electrode plates 24 is provided with a slot type bracket, the distance between two adjacent electro-catalytic electrode plates 24 is 10mm-40mm, and the electro-catalytic electrode plates 24 are titanium-based electrode plates coated with iridium and/or ruthenium, which can be titanium-based electrode plates coated with iridium, titanium-based electrode plates coated with ruthenium or titanium-based electrode plates coated with iridium and ruthenium. In a further preferred embodiment, the distance between two adjacent electrocatalytic electrode plates 24 is 20mm ± 2 mm.
In the preferred embodiment, the wastewater treatment system is provided with a self-contained power supply 20 for powering the electrocoagulation electrode 21 and the electrocatalytic electrode 24.
In the preferred embodiment, the membrane tank 5 comprises an external circulation system and a membrane separation module 33, wherein the membrane separation module 33 comprises a plurality of rows of lined hollow fiber membranes, both ends of each hollow fiber membrane are cast by epoxy resin, the lower ends of membrane wires of the hollow fiber membranes are sealed, and the upper ends of the membrane wires are provided with holes and are connected with the external circulation system through pipelines.
In a further preferred embodiment, the hollow fiber membrane is selected from one or more of polyvinylidene fluoride membrane, polyacrylonitrile membrane and polysulfone membrane. In a further preferred embodiment, the lined hollow fiber membrane sheet is selected from polyvinylidene fluoride lined reinforced hollow fiber membranes.
In a further preferred embodiment, the external circulation system comprises a liquid suction system and a backwashing system, wherein the liquid suction system is provided with a suction water generating pump 37, a first liquid flow meter 38, a pressure gauge 39 and a third valve 40; the backwash system is provided with a cleaning tank 43, a backwash pump 44, a second liquid flow meter 45 and a third one-way valve 46.
In a preferred embodiment, the membrane pool 5 is provided with a second high-low liquid level floating ball 30 and a water production device for discharging water outwards, and the water production device is started when the position of the second high-low liquid level floating ball 30 in the membrane pool 5 is higher than a preset value; when the position of the second high-low liquid level floating ball 30 in the membrane tank 5 is lower than the preset value, the water production device is closed, and the water treated by the membrane tank 5 is discharged.
In a preferred embodiment, the membrane pool 5 is provided with a water production device which discharges water outwards, and in a further preferred embodiment, the water production device is a water production pump. The water producing pump is provided with a time relay, and the water producing device intermittently discharges water according to the preset time of the time relay. For example: when the water producing pump works normally, the water producing pump is stopped for 2 minutes every 8 minutes, and the water producing pump is used and standby.
In the preferred embodiment, a fine grating 6 is arranged at the water inlet of the wastewater collecting tank 1, a filter 8 is arranged at the water outlet of the wastewater collecting tank 1, and the water in the wastewater collecting tank 1 flows to the acid-base adjusting tank 2 under the action of a self-priming pump 9. A first one-way valve 10 is arranged between the wastewater collecting tank 1 and the acid-base adjusting tank 2, so that treated water can be prevented from flowing back well.
In the preferred embodiment, the acid-base adjusting tank 2 is provided with an acid-base adjusting control cabinet 14, a stirring device 15, an acid-base testing probe 11 and an automatic medicine feeding device 13. The stirring device 15 stirs the water in the acid-base adjusting tank 2 under the action of the stirring motor 12. The water treated by the acid-base adjusting tank 2 flows into the electric flocculation tank 3 through a first overflow port 16 (a water outlet of the acid-base adjusting tank 2). The bottom of the acid-base adjusting tank 2 is also provided with an adjusting tank sewage discharge port 17, so that sewage at the bottom of the acid-base adjusting tank 2 can be discharged well.
In a preferred embodiment, the electroflocculation cell 3 is provided with a first water inlet 19 for introducing wastewater. A first valve 18 is arranged between the first overflow port 16 and the first water inlet 19, so that the water flow rate entering the flocculation tank 3 can be better controlled.
In a preferred embodiment, the electric flocculation tank 3 is further provided with an electric flocculation sewage outlet 22, and the electric flocculation sewage outlet 22 is arranged at the bottom of the electric flocculation tank 3 and is used for communicating with the outside of the wastewater treatment system, so that the sludge produced by the electric flocculation tank 3 is dewatered by the filter press 23 and then is disposed outside.
In the preferred embodiment, the water outlet of the electroflocculation chamber 3 is a second overflow port 25, and the water in the electroflocculation chamber 3 overflows into the electro-catalysis chamber 4.
In a preferred embodiment, the bottom of the electro-catalytic cell 4 is provided with a catalytic cell drain outlet 26. The membrane tank 5 is provided with a second water inlet 28 (water inlet of the membrane tank 5), and water treated by the electro-catalysis tank 4 flows into the second water inlet 28 through a third overflow port 27 (water outlet of the electro-catalysis tank 4) and enters the membrane tank 5. The second overflow opening 25 is arranged at a higher level than the third overflow opening 27. The third overflow outlet 27 is located higher than the second water inlet 28.
In the preferred embodiment, the membrane tank 5 is provided with a bottom aeration system consisting of an air compressor 36, a gas flow meter 35, a second one-way valve 34, an aeration disc/tube 29 and piping.
In the preferred embodiment, the bottom of the membrane tank 5 is provided with a membrane tank sewage outlet 32, and the flow discharged from the membrane tank sewage outlet 32 is controlled by a second valve 31.
The wastewater treatment system of the embodiment is integrally controlled through a PLC, and the control device relates to a water inlet system, an acid-base test and automatic chemical feeding device thereof, an electric flocculation and electro-catalysis system, a liquid level control system, a water production and backwashing system and the like, and can effectively control the wastewater treatment process of the whole device; wherein the acid-base test and the automatic medicine feeding device thereof, the electric flocculation and the electric catalysis system can also be independently controlled as an independent module.
The wastewater treatment system of this embodiment uses "electric flocculation/catalysis + membrane filtration" as the core treatment process, waste water gets into from the collecting pit through the grid promptly, filter the pump through the screen cloth and go into acid-base equalizing basin 2, then flow into electric flocculation and electro-catalysis pond 4 by the baffle through-hole and carry out the flocculation and precipitation, electro-catalytic oxidation degradation, degradation waste water flows into membrane cisterna 5 by the upside through-hole, through the dual function of powdered activated carbon deep adsorption and membrane filtration in membrane cisterna 5, activated carbon powder adds and to realize absorption-analysis-degradation mechanism, not only realize the advanced treatment of daily use chemical waste water, and can have the effect to the undulant impact to the system of water quality. Sludge generated by the electric flocculation box body is removed outside after being dehydrated by a filter press.
The embodiment of the invention also provides a daily chemical wastewater treatment method, which comprises the following steps:
(1) introducing wastewater into a wastewater collection tank 1;
(2) the wastewater collected by the wastewater collection tank 1 flows into an acid-base regulation tank 2 for treatment;
(3) the effluent of the acid-base adjusting tank 2 flows into an electric flocculation tank 3 for treatment;
(4) the effluent of the electric flocculation tank 3 flows into an electric catalysis tank 4 for treatment;
(5) effluent of the electro-catalysis tank 4 flows into the membrane tank 5 for treatment, the adsorption material is filled in the membrane tank 5, and water in the membrane tank 5 can flow back to the electro-catalysis tank 4.
In a preferred embodiment, the electric flocculation time of the electric flocculation tank 3 is 10-60 min; the time of the electro-catalysis cell 4 for catalytic degradation is 30-120 min. The power supply mode, current density, pH value and the like of the electric flocculation tank 3 and the electric catalysis tank 4 are preferably selected according to the specific wastewater category.
The daily chemical wastewater treatment method provided by the implementation of the invention relates to the advantages of simple equipment and high automation degree; the coupled electrocatalytic oxidation process and the special adsorption particle backflow process can effectively reduce the sludge amount and reduce the process treatment cost; the integrated coupling process can simultaneously solve the problems of large occupied area and long treatment time of the traditional biological treatment process, and greatly improves the removal efficiency of the refractory organic matters in the daily chemical wastewater.
In order that the technical solutions of the present invention may be further understood and appreciated, several preferred embodiments are now described in further detail.
Example 1
Refer to fig. 1.
S1, enabling the daily chemical wastewater to flow into the wastewater collection pool 1 through the grating 6;
s2, discharging the wastewater in the wastewater collection tank 1 into the acid-base regulation tank 2 through the self-priming pump 9 and the first one-way valve 10, and starting the spiral stirring motor 12, the acid-base testing probe 11 and the automatic dosing device 13 thereof;
s3, allowing the wastewater in the acid-base adjusting tank 2 to flow into the electric flocculation tank 3 through the first overflow port 16 (the water outlet of the acid-base adjusting tank 2) at the upper side, and flocculating and settling partial organic matters through the action of an electric flocculation electrode plate 21 of an electric flocculation system;
s4, after the electric flocculation is carried out in the electric flocculation tank 3, the wastewater flows into the electric catalytic reaction tank 4 through the second overflow port 25 at the upper side, and the organic matters which are difficult to degrade are effectively removed under the action of the electric catalytic electrode plate 24;
s5, the wastewater catalytically degraded by the electro-catalytic reaction tank 4 flows into the membrane tank 5, when the liquid level overflows the separation membrane module 33, a proper amount of activated carbon powder is added, and the air compressor 36 (air compressor) and the second one-way valve 46 thereof are started and stably operated;
s6, discharging the wastewater in the membrane pool 5 to a pipe network through the third valve 40 and the first liquid flowmeter 38 under the action of the suction water-producing pump 37;
s7, starting a reflux pump 41 of the membrane pool 5 at regular time, and refluxing a part of the membrane pool 5 entrained with the activated carbon wastewater to the electro-catalysis pool 4;
s8, cleaning the sludge in the electric flocculation tank 3, the electric catalysis tank 4 and the membrane tank 5 at regular time, and dehydrating and transporting the sludge by a filter press.
Before the wastewater enters the grating 6, the influent water is sampled, and the chemical oxygen demand and the content of the anionic surfactant are measured on the influent water sample. And (3) carrying out effluent sampling on the water discharged to the pipe network in the membrane pool 5, and measuring the chemical oxygen demand and the content of the anionic surfactant in the effluent sample. Specific test results are shown in table 1.
TABLE 1
In table 1, ND means below the minimum scale or resolution within the detection capability of the detection instrument.
As can be seen from the data in Table 1, the present invention provides a wastewater treatment system and method having superior wastewater treatment effects. Can greatly reduce the chemical oxygen demand and the content of the anionic surfactant in the wastewater.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a wastewater treatment system, its characterized in that, includes waste water collecting pit, acid-base equalizing basin, electric flocculation basin, electrocatalysis pond and membrane cisterna, the delivery port of waste water collecting pit is connected the acid-base equalizing basin, the delivery port of acid-base equalizing basin is connected the electric flocculation basin, the delivery port of some flocculation basins is connected the electrocatalysis pond, the delivery port of electrocatalysis pond is connected the membrane cisterna, the adsorption material is equipped with in the membrane cisterna, water in the membrane cisterna can flow back extremely in the electrocatalysis pond.
2. The wastewater treatment system of claim 1, wherein the adsorption material is one or more of bamboo charcoal, clay, polymers, nano-materials, activated carbon, microparticles and resins, and the amount of the adsorption material is 1-5% of the water amount in the membrane tank.
3. The wastewater treatment system of claim 1, wherein a collection tank water outlet device and an intelligent control device are arranged outside a water outlet of the wastewater collection tank, the wastewater collection tank is provided with a first high-low liquid level floating ball, the membrane tank is provided with a second high-low liquid level floating ball, and the intelligent control device is used for controlling the collection tank water outlet device to be started when the position of the first high-low liquid level floating ball in the wastewater collection tank is higher than a preset value and the position of the second high-low liquid level floating ball in the membrane tank is lower than the preset value; and/or the presence of a gas in the gas,
the intelligent control device is used for controlling the collecting tank water outlet device to stop starting when the position of the first high-low liquid level floating ball in the wastewater collecting tank is lower than a preset value or the position of the second high-low liquid level floating ball in the membrane tank is higher than a preset value.
4. The wastewater treatment system of claim 1, wherein a plurality of the electrocoagulation electrodes are arranged in the electrocoagulation cell, a clamping groove type support is arranged at the bottom of each electrocoagulation electrode, the distance between every two adjacent electrocoagulation electrodes is 10mm-40mm, and each electrocoagulation electrode is an iron plate or an aluminum plate;
the electrocatalysis cell is provided with a plurality of electrocatalysis pole plates, the bottoms of the electrocatalysis pole plates are provided with clamping groove type supports, the distance between two adjacent electrocatalysis pole plates is 10mm-40mm, and the electrocatalysis pole plates are titanium-based pole plates plated with iridium and/or ruthenium.
5. The wastewater treatment system of claim 1, wherein the membrane tank comprises an external tank circulation system and a membrane separation module, the membrane separation module comprises a plurality of rows of hollow fiber membranes, both ends of each hollow fiber membrane are cast with epoxy resin, the lower ends of membrane filaments of the hollow fiber membranes are sealed, the upper ends of the membrane filaments are provided with holes and are connected with the external tank circulation system through pipelines, the external tank circulation system comprises a liquid suction system and a backwashing system, and the liquid suction system is provided with a suction water production pump, a first liquid flow meter and a third valve; the backwashing system is provided with a cleaning pool, a backwashing pump, a second liquid flow meter and a second one-way valve; the hollow fiber membrane is selected from one or more of polyvinylidene fluoride membrane, polyacrylonitrile membrane and polysulfone membrane.
6. The wastewater treatment system of claim 1, wherein the adsorbent material is activated carbon and water with activated carbon in the membrane tank is returned to the electrocatalytic tank.
7. The wastewater treatment system of claim 1, wherein the membrane tank is provided with a second high-low liquid level floating ball and a water production device for discharging water outwards, and the water production device is started when the position of the second high-low liquid level floating ball in the membrane tank is higher than a preset value; when the position of the second high-low liquid level floating ball in the membrane pool is lower than a preset value, the water production device is closed; or the like, or, alternatively,
the membrane pool is provided with a water production device which discharges water outwards, the water production pump is provided with a time relay, and the water production device discharges water intermittently according to the preset time of the time relay.
8. The wastewater treatment system of claim 1, wherein a fine screen is provided at a water inlet of the wastewater collection tank, and a filter is provided at a water outlet of the wastewater collection tank;
the acid-base adjusting tank is provided with an acid-base adjusting control cabinet, a stirring device, an acid-base testing probe and an automatic dosing device, and the bottom of the acid-base adjusting tank is also provided with a drain outlet of the adjusting tank;
the electric flocculation tank is provided with an electric flocculation drain, and the electric flocculation drain is arranged at the bottom of the electric flocculation tank.
A catalytic pool sewage outlet is formed in the bottom of the electro-catalytic pool;
the membrane tank is provided with a second water inlet, the position of the water outlet of the electric flocculation tank is higher than the position of the water outlet of the electric catalysis tank, and the position of the water outlet of the electric catalysis tank is higher than the position of the second water inlet;
the membrane tank is also provided with a bottom aeration system, and the aeration system consists of an air compressor, a gas flow meter, a third single valve, an aeration disc/an aeration pipe and a pipeline.
9. A wastewater treatment method is characterized by comprising the following steps:
(1) introducing wastewater into a wastewater collection tank;
(2) wastewater collected by the wastewater collection tank flows into an acid-base regulation tank for treatment;
(3) the effluent of the acid-base adjusting tank flows into an electric flocculation tank for treatment;
(4) the effluent of the electric flocculation tank flows into an electric catalysis tank for treatment;
(5) effluent of the electro-catalysis tank flows into a membrane tank for treatment, an adsorption material is filled in the membrane tank, and water in the membrane tank can flow back to the electro-catalysis tank.
10. The wastewater treatment method according to claim 9, wherein the electrocoagulation time is 10 to 60 min; the time of the catalytic degradation of the electro-catalytic cell is 30-120 min.
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| CN115504558A (en) * | 2022-11-01 | 2022-12-23 | 临沭冠山升华食品有限公司 | Wastewater treatment device for dehydrated garlic flake production |
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Application publication date: 20210427 |