CN112250214A - Method and system for pretreatment of high-salt mustard wastewater - Google Patents
Method and system for pretreatment of high-salt mustard wastewater Download PDFInfo
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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
-
- 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
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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Abstract
本发明提供了一种用于高盐榨菜废水预处理的方法和系统，该系统包括格栅、调节池、循环反应池、中间罐和沉淀池。该方法通过对循环反应池中悬挂填料上的嗜盐复合菌进行强化，使填料表面附着生长的复合菌剂和悬浮生长的活性污泥的两种微生物能在系统中共存，去除榨菜废水中大部分的有机物和氨氮，净化后的废水再通过沉淀池进一步对悬浮物进行去除，能为后续的电渗析处理工艺减轻负荷，提高处理效率及减低运行成本。本发明所述方法具有微生物浓度高、抗冲击负荷能力强、处理有机负荷高、生物脱氮除磷能力强、预处理效果好、工程投资和运行费用低等特点。
The present invention provides a method and system for pretreatment of high-salt mustard waste water. The system includes a grid, a regulating tank, a circulating reaction tank, an intermediate tank and a sedimentation tank. The method strengthens the halophilic compound bacteria on the suspended filler in the circulating reaction tank, so that the two microorganisms of the compound bacteria agent attached to the surface of the filler and the activated sludge grown in suspension can coexist in the system, and remove the large amount of bacteria in the mustard wastewater. Part of the organic matter and ammonia nitrogen, and the purified wastewater is further removed by the sedimentation tank to further remove the suspended matter, which can reduce the load for the subsequent electrodialysis treatment process, improve the treatment efficiency and reduce the operating cost. The method of the invention has the characteristics of high microbial concentration, strong anti-shock load capacity, high organic load treatment, strong biological nitrogen and phosphorus removal capacity, good pretreatment effect, and low engineering investment and operation cost.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a method and a system for pretreating high-salt preserved szechuan pickle wastewater.
Background
The waste water from the pickling of the preserved szechuan pickle belongs to waste water with three high contents of organic matters, ammonia nitrogen and salinity (the salinity is 1 to 15 percent), and the waste water is usually directly discharged, so that the pollution of rivers and underground water is caused, and the surrounding ecological environment is seriously influenced. At present, the treatment of the wastewater adopts a physicochemical and biochemical combined process, or is mixed with other wastewater to form comprehensive wastewater, and then the comprehensive wastewater is treated by using a conventional biochemical treatment technology.
The biological method is a treatment technology with high treatment efficiency, good stability and low treatment cost, but the conventional water treatment microorganisms have low salinity tolerance concentration (less than 1.0 percent) and cannot tolerate the high salinity (more than 10 percent) of the preserved mustard waste water, so in order to improve the salt tolerance of the biological method, part of the inventors begin to try to biologically strengthen the traditional biological technology by using functional microorganisms with halophilic (tolerant) salt performance. Chinese patent publication No. CN101629153A, published as 2010, 1/20, discloses a method for treating tuber mustard wastewater by using halophilic (tolerant) complex flora, which comprises adding complex flora consisting of halomonas, candida, bacillus and bacillus into tuber mustard wastewater to treat wastewater. It has been found that these halophilic (tolerant) complex bacteria groups can degrade organic substances and the like in the tuber mustard wastewater, but have certain limitations: when the salinity is 3.5-5.0%, the treatment effect is good, but the treatment efficiency is obviously reduced along with the increase of the salinity, so that the method cannot be applied to the treatment of the preserved szechuan pickle pickling wastewater; the added microbial inoculum is easy to lose or degenerate, and the maintenance time of the biological strengthening effect is short. In addition, the existing biological pretreatment technology only considers the removal of organic matters and ammonia nitrogen in the wastewater, and does not consider the removal of suspended particles.
The electrodialysis treatment technology is a new type of electrochemical wastewater treatment technology that has emerged in recent years, and has attracted extensive attention and application because it can not only achieve efficient treatment of high-salinity wastewater, but also recover resources from the wastewater. In engineering application of treating preserved szechuan pickle salting wastewater by using an electrodialysis device, the electrodialysis device can not work normally, the main reason is that high-concentration organic matters and suspended particles in the preserved szechuan pickle salting wastewater can seriously block and pollute an ion exchange membrane in the electrodialysis device, and therefore, in order to ensure normal operation of the electrodialysis device, a pretreatment unit is usually additionally arranged at the front section of the electrodialysis device so as to strengthen removal of the organic matters and the suspended particles in the preserved szechuan pickle salting wastewater.
Disclosure of Invention
The invention aims to provide a method and a system for pretreating high-salt preserved szechuan pickle wastewater, wherein the preserved szechuan pickle wastewater treated by the method is used for subsequent electrodialysis treatment, so that an ion exchange membrane in an electrodialysis device can normally work, and the normal operation of the electrodialysis device is ensured. The method has the characteristics of high microorganism concentration, strong impact load resistance, high organic load treatment capacity, strong biological nitrogen and phosphorus removal capacity, good pretreatment effect, low engineering investment and operation cost and the like.
The technical scheme of the invention is as follows:
a system for pretreatment of high-salt preserved szechuan pickle waste water, which is characterized in that: the system comprises an adjusting tank, a circulating reaction tank, an intermediate tank and a sedimentation tank which are sequentially arranged, wherein a grid is arranged at the upstream of the adjusting tank, the downstream of the adjusting tank is connected with the circulating reaction tank through a main water inlet pipe, a first water suction pump and a first check valve are arranged on the main water inlet pipe, the circulating reaction tank is sequentially divided into a biological selection area, a pre-reaction area and a main reaction area by partition walls according to the flowing water sequence, the partition wall between the biological selection area and the pre-reaction area is an overflow wall, the lower part of the partition wall between the pre-reaction area and the main reaction area is provided with an upper partition wall of an overflow port, a plurality of filler suspension brackets are arranged in the main reaction area, a plurality of filler bundles for attaching halophilic composite microbial agents are arranged on each filler suspension bracket from top to bottom, the filling volume of the filler bundles accounts for 60-70% of the volume of the main reaction area, a first, the downstream end of the first reflux pump is connected with a first reflux pipe, the downstream end of the first reflux pipe is inserted into a biological selection area, a stirrer driven by a motor is arranged in the biological selection area, an aeration pipe is arranged at the bottom of the main reaction area, the aeration pipe extends out of the circulation reaction tank and is connected with an aeration pump, the main reaction area is connected with the inlet end of a second water suction pump through a water suction pipe, the water suction pipe is connected with a main water inlet pipe through a second reflux pipe, a second reflux pump and a second check valve are arranged on the second reflux pipe, the outlet end of the second water suction pump is connected with the water inlet pipe of an intermediate tank, the water outlet pipe of the intermediate tank is connected with a sedimentation tank, a third water suction pump is arranged on the water outlet pipe, the sedimentation tank is sequentially divided into a coagulation area, a flocculation area and a sedimentation area by partition walls according to the flow sequence, the coagulation area is communicated with the flocculation area through a flow guide, this flocculation draft tube is located honeycomb duct downstream mouth top, set up by motor drive's agitator in the flocculation draft tube, in the coagulation district respectively, the overflow channel intercommunication is formed by the last partition wall of flocculation district side and the overflow wall of sedimentation district side between flocculation district and the sedimentation district, and sedimentation district upper portion sets up the delivery port, and the sedimentation district bottom sets up the mud discharging port, sets up the mud scraper above the mud discharging port, mud scraper fixed connection is in a pivot by motor drive.
The side wall of the main reaction area of the circulating reaction tank is provided with drain pipes with different water levels, each drain pipe is connected with a drain header pipe, the bottom of the main reaction area is provided with a sludge discharge pipe, and the sludge discharge pipe and each drain pipe are respectively provided with an electromagnetic valve.
And flowmeters are arranged on the main water inlet pipe, the water pumping pipe, the first return pipe and the second return pipe.
The filler bundle comprises a framework and a fiber bundle attached with the halophilic complex microbial inoculum, the framework is composed of two circular rings and a plurality of radially extending connecting strips for connecting the two circular rings, and a plurality of fiber bundles are fixed on the framework and extend in a ray shape to form the filler bundle with the diameter of 80 mm-100 mm.
The method for pretreating the high-salt preserved szechuan pickle wastewater adopts the system for treatment, and specifically comprises the following steps:
1) filtering the high-salinity wastewater through a grating, allowing the high-salinity wastewater to enter an adjusting tank, and adjusting the pH value of the wastewater to 6.5-8 by using dilute hydrochloric acid or NaOH;
2) step 1) the wastewater after pH value adjustment enters a circulating reaction tank to carry out water inlet-aeration-sedimentation-drainage circulation, so that filler attached with halophilic composite bacteria in filler bundles on a suspension bracket is fully contacted with the wastewater, and organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater are removed;
3) the effluent circularly treated by the circular reaction tank enters a sedimentation tank after passing through an intermediate tank, and a coagulant aid are respectively added into a coagulation area and a flocculation area of the sedimentation tank and are used for precipitating difficultly-compatible organic matters and fine particle suspended matters in the wastewater;
4) the water discharged from the sedimentation tank completes the pretreatment of the high-salt preserved szechuan pickle wastewater.
The filling volume ratio of the filler in the main reaction zone of the circulating reaction tank is 60-70%.
Each cycle of the circulation of the circulating reaction tank is 6 hours, wherein water is fed for 1 hour, aeration is carried out for 2.5 hours after water is fed, sedimentation is carried out for 1.5 hours, and water is discharged for 1 hour;
preferably, the water inflow entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the water discharge ratio is 1/3.
The halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent.
The coagulant and the coagulant aid are respectively polyaluminium chloride and polyacrylamide anions; preferably, the adding amount of the polyaluminium chloride per ton of water is 200-400 g; preferably, the dosage of each ton of water of the polyacrylamide anion is 1-2 g.
The stirring time of the coagulation and flocculation area of the sedimentation tank is 25-30 min, the sedimentation time is 1-1.2 h, and the HRT of the sedimentation tank is 1.4-1.7 h.
The invention adopts a Cyclic Activated Sludge System (CASS) which is an Activated Sludge treatment method of circulating water inlet, aeration, sedimentation and drainage, and biological degradation and Sludge-water separation of organic matters are completed in one reactor. The circulating reaction tank combines an activated sludge process and a biofilm process, the whole reactor operates in a plug flow mode, and each reaction zone operates in a completely mixed mode to realize the functions of synchronous carbonization and nitrification-denitrification. The circulating reaction tank is filled with suspended fillers, salinity is reduced by adding halophilic composite bacteria to enhance the denitrification performance and organic matter removal efficiency of the system, the halophilic composite bacteria has extremely strong high osmotic pressure resistance and grows well under the condition of 1% -15% salinity, and the circulating reaction tank has the characteristics of high treatment efficiency, strong impact load resistance, good denitrification and dephosphorization performance and the like through the synergistic effect of the four microorganisms. The halophilic bacteria adsorbed on the surface of the filler not only improve the microbial concentration, but also enhance the impact resistance load, and after the halophilic composite bacteria are inoculated into the system, the system can resist high-salinity preserved szechuan pickle wastewater, so that the denitrifying bacteria in the system can still normally play a role, and the treatment efficiency is improved.
Adding chemical agents into a coagulation area and a flocculation area of the sedimentation tank, and respectively adding a coagulant and a coagulant aid, so that particles which are difficult to precipitate in water can be mutually polymerized to form colloid and combined with impurities in the water body to form a larger flocculating constituent. Not only can adsorb suspended matters, but also can adsorb partial bacteria and soluble substances.
The invention adopts CASS + coagulating sedimentation combination to treat high-salt preserved szechuan pickle wastewater, the circulating reaction tank combines an activated sludge method and a biofilm method, the high-salt environment can be endured by combining the biofilm method which is inoculated with halophilic bacteria agent and biologically enhanced by the advantages of flexible operation and simple operation of the activated sludge method, thereby greatly improving the pollutant removal effect, shortening the process flow, greatly reducing the pollution concentration at the front end of the electrodialysis treatment process, lightening the load of the subsequent electrodialysis treatment process and ensuring the normal operation and stable water outlet of the electrodialysis equipment.
Compared with the traditional activated sludge method, the method has the following remarkable advantages:
(1) the CASS process for filling the suspended filler combines an activated sludge process and a biological membrane process, has the advantages of two treatment technologies, enables a system to have higher volume load and microorganism concentration, has high impact load resistance and adaptability, and can well solve the problems of poor nitrification stability, high operation cost, poor salt resistance and the like of the traditional activated sludge process.
(2) The combined soft filler has the advantages of large specific surface area, high oxygen utilization rate, difficult blockage and capability of efficiently removing pollutants in water.
(3) The suspended combined soft filler arranged in the circulating reaction tank can improve the sludge concentration in the system, and the inner ring of the combined soft filler is a snowflake-shaped plastic branch, so that the film can be hung, bubbles can be effectively cut, the transfer rate and the utilization rate of oxygen are improved, and the generation of sludge is reduced.
(4) The halophilic composite microbial inoculum is a composite microbial inoculum, wherein the halophilic composite microbial inoculum has halotolerant bacteria and strains with high ammonia nitrogen resistance and other properties, can reduce the toxic action of factors such as high salt and high ammonia nitrogen on microorganisms, can efficiently remove nitrogen in a completely aerobic environment under a high salt condition (1-15%), can simultaneously realize nitration and denitrification reactions in one reactor, reduces the occupied area, and is convenient to operate, maintain and manage.
(5) The halophilic complex bacteria agent adopted by the invention can realize rapid immobilization on suspended fillers, the biofilm formation period (10-15 d) of a biological system inoculated with the halophilic complex bacteria agent is obviously lower than the biofilm formation period (30-35 d) in the traditional activated sludge method, the treatment effect of the system is enhanced, and the system is ensured to have higher impact load resistance and high ammonia nitrogen resistance, high salt resistance, high organic matter concentration resistance and the like.
The combined process combines the advantages of an activated sludge method and a biofilm method, accelerates the formation and fixation of a biofilm by virtue of the suspended filler with large specific surface area in the circulating reaction tank, and improves the running performance of a combined process system, thereby greatly reducing the running investment and the occupied area of the process, reducing the complex procedures of running management, and having the characteristics of flexible and convenient operation and management. Therefore, the pretreatment of the electrodialysis treatment of the preserved szechuan pickle wastewater by adopting the combined process has the advantages of high treatment efficiency, low engineering investment and operation cost and the like. The combined process can reduce the salinity of the wastewater at the front end of the electrodialysis treatment process and simultaneously remove other pollutants so as to reduce the load of subsequent electrodialysis treatment, can obviously shorten the process flow, and fully exerts the characteristics of salt tolerance, high ammonia nitrogen resistance, high COD resistance, high toxicity resistance and the like of a combined process system.
Drawings
FIG. 1 is a schematic diagram of a wastewater pretreatment system of the present invention;
fig. 2 is a schematic view of the packing bundle structure of the present invention.
Detailed Description
Referring to fig. 1 and 2, the method for pretreating high-salinity wastewater according to the present invention is performed by using a high-salinity wastewater pretreatment system, and specifically comprises the following steps:
a system for pretreatment of high-salt preserved szechuan pickle wastewater comprises an adjusting tank 17, a circulating reaction tank 18, a middle tank 19 and a sedimentation tank 20 which are sequentially arranged, wherein the adjusting tank 17 is connected with a grid 16 arranged at the upstream through a pipeline, the pipeline is provided with a valve and a water pump, and the grid 16 is used for filtering out impurities and suspended matters in the wastewater to be treated; the downstream of equalizing basin 17 connects circulation reaction tank 18 through main inlet tube 3, is provided with first suction pump 1 and first check valve 2 on this main inlet tube 3 to and be used for measuring the flowmeter of the flow of intaking, first suction pump 1 is arranged in drawing water from equalizing basin 17, and first check valve 2 is used for preventing the water backward flow that flows through. The circulating reaction tank 18 is internally divided into a biological selection area 18-1, a pre-reaction area 18-2 and a main reaction area 18-3 by partition walls in sequence according to water flow, the partition wall between the biological selection area 18-1 and the pre-reaction area 18-2 is an overflow wall, so that the biological selection area 18-1 enters the pre-reaction area 18-2 through overflow, and the lower part of the partition wall between the pre-reaction area 18-2 and the main reaction area 18-3 is provided with an upper partition wall of a flow through port, so that water in the pre-reaction area 18-2 enters the main reaction area 18-3 through the flow through port. The main reaction zone is internally provided with a plurality of filler hangers 13, a plurality of filler bundles 13a for attaching halophilic complex bacteria agents are arranged on each filler hanger 13 from top to bottom, and the filling volume of the filler bundles accounts for 60-70% of the volume of the main reaction zone. The filler bundle comprises a framework and a fiber bundle attached with the halophilic complex microbial inoculum, the framework is composed of two circular rings and a plurality of radially extending connecting strips for connecting the two circular rings, the fiber bundles are fixed on the framework and extend in a ray shape to form a filler bundle 13a with the diameter of 80 mm-100 mm, and the filler bundle 13a is convenient for the halophilic complex microbial inoculum to be attached to form a hanging film. The biological selection device is characterized in that a first backflow pump 6 is arranged in the main reaction zone 18-3, the downstream end of the first backflow pump 6 is connected with a first backflow pipe 12, the downstream end of the first backflow pipe 12 is inserted into the biological selection zone 18-1 to form a first backflow circulation structure, a flow meter is arranged on the first backflow pipe 12 and used for measuring first backflow flow, and a stirrer 15 driven by a motor is arranged in the biological selection zone. The bottom of the main reaction zone 18-3 is provided with an aeration pipe 5, the aeration pipe 5 is provided with a plurality of microporous aeration heads, and the aeration pipe 5 extends out of the circulating reaction tank 18 and is connected with an aeration pump 9. The main reaction zone 18-3 is connected with the inlet end of a second water pump 24 through a water pumping pipe 23, and a flowmeter and a check valve are arranged on the water pumping pipe 23 and used for measuring the water quantity pumped out of the main reaction zone 18-3. The water pumping pipe 23 is connected with a second return pipe 22, the second return pipe 22 is welded on the water pumping pipe 23 through a tee joint, the water pumping pipe 23 is connected with the main water inlet pipe 3 through the second return pipe 22 to form a second return circulation structure, and the second return pipe 22 is connected with the main water inlet pipe 3 through a tee joint or welding. The second return pipe 22 is provided with a second return pump 25, a second check valve 4, and a flow meter 14, and the flow meter 14 is used for measuring a second return flow rate. The outlet end of the second water pump 24 is connected with the water inlet pipe of the intermediate tank 19, the water outlet pipe of the intermediate tank 19 is connected with the sedimentation tank 20, and the water outlet pipe is provided with a third water pump 26. The sedimentation tank 20 is sequentially divided into a coagulation area 20-1, a flocculation area 20-2 and a sedimentation area 20-3 by partition walls according to a flowing water sequence, the coagulation area 20-1 is communicated with the flocculation area 20-2 through a guide pipe at the lower part, a flocculation guide cylinder 27 is arranged in the flocculation area 20-2, the flocculation guide cylinder 27 is positioned above the lower downstream opening of the guide pipe, stirrers 15 driven by a motor are respectively arranged in the flocculation guide cylinder 27 and the coagulation area 20-1, an overflow channel 28 is formed between the flocculation area 20-2 and the sedimentation area 20-3 by an upper partition wall at the side of the flocculation area and an overflow wall at the side of the sedimentation area to be communicated, and flocculated water overflows into the sedimentation area 20-3 through the overflow channel 28. The upper part of the settling zone 20-3 is provided with a water outlet 21, the bottom of the settling zone 20-3 is provided with a sludge discharge port 20-4, a sludge scraper 29 is arranged above the sludge discharge port 20-4, and the sludge scraper 29 is fixedly connected on a rotating shaft driven by a motor.
The side wall of a main reaction zone 18-3 of the circulating reaction tank is provided with drain pipes with different water levels, each drain pipe is connected with a drain main pipe 11, the drain main pipe 11 is provided with a valve 10, the bottom of the main reaction zone 18-3 is provided with a sludge discharge pipe 7, and the sludge discharge pipe 7 and each drain pipe are respectively provided with an electromagnetic valve.
The system arranges a biological selection area 18-1 in a circulating reaction tank 18, and is used for arranging a reaction tank with shorter retention time before the main reaction area 18-3 carries out aerobic reaction, so that the returned mixed liquor and the undiluted wastewater are contacted in the biological selection area 18-1 to maintain higher food-micro ratio (F/M), enhance the stability of the aerobic reaction of the main reaction area 18-3 and improve the impact load resistance of the system; in the pre-reaction zone 18-2, microorganisms can rapidly adsorb most soluble organic matters in the sewage through a rapid enzyme transfer mechanism, and the microorganisms undergo a high-load matrix rapid accumulation process, so that the microorganisms have a good buffering effect on the quality, quantity, pH and toxic and harmful substances of inlet water, and inhibit the growth of filamentous fungi, thereby effectively preventing sludge from swelling; the main reaction zone 18-3 undergoes a matrix degradation process with lower load to deeply degrade various pollutants, and sludge and nitrifying liquid in the main reaction zone 18-3 flow back to the biological selection zone 18-1 through the first return pipe 12 so as to keep the concentration of the activated sludge stable and good nitrification effect.
The pretreatment of the high-salt preserved szechuan pickle wastewater by adopting the system comprises the following steps:
1) high-salt preserved szechuan pickle waste water passes through the grid, filters, removes partial suspended substance, eliminates the influence of suspended substance to follow-up processing system. Enabling the waste water filtered by the grids to enter an adjusting tank, and adjusting the pH value of the waste water to 6.5-8 by using dilute hydrochloric acid or NaOH;
2) and (3) enabling the wastewater with the pH value adjusted to enter a circulating reaction tank to carry out water inlet-aeration-precipitation-drainage circulation, wherein each cycle of the circulation is 6 hours, water is fed for 1 hour, aeration is carried out for 2.5 hours after water is fed, precipitation is carried out for 1.5 hours, and water is drained for 1 hour, so that organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater are continuously removed. The water inflow entering the circulating reaction tank is adjusted to be 300-900L/h through a water inlet pump and a flow meter, the aeration intensity range is 900-1200L/h, the sludge concentration is 3200-3500 mg/L, and the water discharge ratio is 1/3 (ratio of water inlet liquid level to water decanting liquid level)/water inlet liquid level). After the wastewater is treated by a CASS pool reinforced by halophilic compound bacteria, most of pollutants such as COD (chemical oxygen demand), SS (suspended solid) and the like in the wastewater can be removed, and nitrogen-containing pollutants such as ammonia nitrogen and the like are mainly removed by virtue of aerobic nitrification reaction in a main reaction zone;
in the wastewater circulation process, the filler attached with halophilic compound bacteria in the filler bundles on the suspension bracket is fully contacted with the wastewater, and organic matters, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater are removed or reduced; the filling volume ratio of the filler in the main reaction zone of the circulating reaction tank is 60-70%, so that the specific surface area of the filler is large, the oxygen utilization rate is high, the blockage is not easy to occur (the fixed snowflake-shaped branches in the filler bundles can be used for film hanging and can also effectively cut bubbles, the oxygen transfer rate and the oxygen utilization rate are improved), and pollutants in water can be efficiently removed.
The halophilic composite microbial inoculum is prepared by compounding Rhodococcus erythropolis C1, Leibetococcus motilis, Pseudomonas aeruginosa, Alcaligenes faecalis and Acinetobacter, wherein the Rhodococcus erythropolis C1: motilin lepigone: the bacterium pseudomonas aeruginosa: alcaligenes faecalis: the volume ratio of the acinetobacter is 10-15%: 20-30%: 10-20%: 15-20%: 10 to 20 percent
3) And the effluent circularly treated by the circulating reaction tank enters the sedimentation tank after passing through the intermediate tank, wherein the effluent of the circulating reaction tank is regulated by the flowmeter to enter the intermediate tank and then enters the sedimentation tank from the intermediate tank so as to ensure the stable flow of the water flow of the system. Effluent sequentially passes through a coagulation zone, a flocculation zone and a sedimentation zone in a sedimentation tank, and coagulant polyaluminium chloride and coagulant aid polyacrylamide anions are respectively added into the coagulation zone and the flocculation zone of the sedimentation tank and are used for precipitating difficult-to-dissolve organic matters and fine particle suspended matters in wastewater; the coagulant and the flocculating agent are respectively and fully mixed with the pollutants in the wastewater by stirring in the coagulation area and the flocculation area through the stirring rod 15, so that the treatment effect is improved. The stirring time of the coagulation zone and the flocculation zone of the sedimentation tank is 25-30 min, the sedimentation time is 1-1.2 h, and the HRT of the sedimentation tank is 1.4-1.7 h.
4) The water discharged from the water outlet 21 of the sedimentation tank completes the pretreatment of the high-salt preserved szechuan pickle wastewater.
The invention adopts CASS + coagulating sedimentation combination to pretreat the high-salt preserved szechuan pickle wastewater, and because the preserved szechuan pickle wastewater has variable water quality, the water quality entering a treatment system is complex, and more suspended matters exist, the preserved szechuan pickle wastewater enters a grid through a water collecting pipeline to remove part of the suspended matters so as to improve the operation condition of a subsequent biological treatment structure, and then enters an adjusting tank to play the roles of adjusting the water quantity and stabilizing the water quality. The effluent of the regulating reservoir is pumped into the circulating reaction tank, the rapid enrichment and the dominant construction of the halophilic composite microbial inoculum in the system are realized by virtue of the suspended filler with large specific surface area, and the suspended filler in the circulating reaction tank can solve the problems that the sludge settling performance is poor and the effluent suspended matter concentration is high due to the influence of salinity (the system for inoculating halophilic bacteria can tolerate the high salt concentration, and the halophilic bacteria can be attached to the suspended filler in a biofilm form, so that the influence of salinity on microbial degradation is reduced, and the problem of microorganism loss caused by the shedding of the biofilm in the activated sludge process is solved by combining the large specific surface area of the suspended filler). The main reaction zone of the circulating reaction tank is equivalent to a halophilic composite bacteria biologically-enhanced biological contact oxidation tank, and can remove most organic matters, ammonia nitrogen, partial total nitrogen and partial total phosphorus (the system enhanced by halophilic composite bacteria has heterotrophic nitrification-aerobic denitrification functions, and can simultaneously remove organic matters and nitrogen and phosphorus in one system), reduce the treatment load of a subsequent coagulating sedimentation tank and reduce the operation cost of the whole process. Improving the nitrification efficiency and stability of the system and realizing the high-efficiency removal of ammonia nitrogen and organic matters in the wastewater.
And (3) enabling effluent after the CASS process to pass through a tundish and then enter a sedimentation tank for coagulation, flocculation and sedimentation treatment, adding a coagulant PAC into a coagulation area, adding a coagulant aid PAM into the flocculation, and respectively stirring to enhance the removal of refractory organic matters and fine suspended particles.
The invention can effectively solve the treatment problem caused by the unique water quality of the high-salt preserved szechuan pickle wastewater, improve the treatment efficiency and enhance the treatment effect.
The invention will be further illustrated with reference to the following examples:
the method of the invention is adopted to treat the mixed wastewater of the comprehensive wastewater and the salting wastewater of Fuling certain mustard tuber factories (the volume mixing ratio of the comprehensive wastewater and the salting wastewater is 1: 2.5). COD and NH in the preserved szechuan pickle wastewater4 +The water quality of-N and SS is 14380-14410, 441-453 and 218-230 mg/L respectively. Adjusting the pH value of the solution to 6.5-8.5 by a grid through an adjusting tank, entering a circulating reaction tank for biological enhancement treatment, performing activation treatment on halophilic bacteria (the inoculum size is 5% -10%) (cold-stored halophilic compound bacteria seed liquid is subjected to amplification culture, and a culture medium is added to enable the halophilic compound bacteria seed liquid to grow to the optimal concentration) for 3d, setting HRT (HRT) 12h for sequencing batch intermittent water change, performing coagulation, flocculation and precipitation treatment, namely adding 5mL of 10g/L PAC, adding 5mL of 1g/L PAM, uniformly mixing, adjusting the pH value to 8.5, uniformly stirring for 30min, and standing for 1 h. The above run parameters were maintained at 15 ℃ and 25 ℃ respectively for treatment and comparison.
Supernatant COD and NH precipitated at different temperatures of 15 ℃ and 25 DEG C4 +The water quality of the N, SS is 7790-9400, 122.3-176.1, 7-87 mg/L, 6490-7990, 79.9-146.1 and 10-87 mg/L respectively. It can be seen that the combined process of the present invention can still maintain good removal efficiency at low temperature (around 15 ℃).
The concrete treatment conditions of the water quality indexes are shown in the following table:
TABLE 1 treatment of COD and NH by combined process4 +Handling cases of N and SS
And (4) conclusion: through continuous 9-period observation of the CASS process and the coagulating sedimentation combined process for inoculating the halophilic complex microbial inoculum, the CASS + coagulating sedimentation combined process has a good pretreatment effect on high-salt tuber mustard wastewater, and the combined process can be used for treating COD and NH4 +The average removal rates of-N and SS can be as high as 51.4%, 79.3% and 88.7%, respectively. And still has certain pretreatment effect under the condition of low temperature (15 ℃).
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Application publication date: 20210122 |