CN104671615B - A kind of Taihu Lake that is used for enters lake livestock and poultry cultivation sewage treatment process - Google Patents

Abstract

The invention relates to a treatment process for livestock and poultry breeding sewage entering the lake in Taihu Lake. The treatment process designed and adopted mainly uses the combination of primary sedimentation filtration, anaerobic and aerobic biochemistry, flocculation coagulation reaction with drug addition and membrane module filtration. , and adopts the material method of adding compound water treatment agents, so as to achieve the functions of high-efficiency denitrification, phosphorus removal and COD reduction. At the same time, the present invention also has good effects of decolorization and sterilization. The invention has low operating cost and management cost, good sewage treatment effect, and the treated livestock and poultry breeding sewage can reach the first-level discharge standard for sewage treatment in the Taihu Lake area stipulated by the state.

Description

A process for treating livestock and poultry breeding sewage in Taihu Lake

technical field

The invention relates to the technical field of environmental protection, and mainly aims at the treatment of livestock and poultry breeding sewage at the lake entrance along the Taihu Lake, and provides a process for treating the livestock and poultry breeding sewage entering the Taihu Lake.

Background technique

At present, along the Taihu Lake, due to the high attention and strict supervision of government departments at all levels, the treatment and discharge of industrial enterprise sewage can basically meet the standards. There are still many livestock and poultry breeding sites at the entrance of Taihu Lake, including many agricultural demonstration parks. Due to the typical "three highs" characteristics of livestock and poultry farm sewage, CODcr is as high as 3000-12000mg/l, and ammonia nitrogen is as high as 800-2200mg/l , P exceeds the standard by dozens of times, limited to the livestock and poultry breeding industry is a small profit industry, and there are still great technical and economic difficulties in meeting the emission standards. The reason is that the sewage from thousands of breeding farms and agricultural demonstration parks along Taihu Lake has not been treated up to the standard. Although some large-scale farms and agricultural demonstration parks have set up simple sewage treatment equipment and facilities, due to their simple equipment and facilities and single treatment process, UASB+SBR process, ZWD new biogas digester + biological cycle treatment process, etc. The traditional anaerobic or aerobic process treatment is not suitable for farm sewage, the treatment effect is not ideal, the effluent water quality cannot meet the sewage discharge standard above the second level in the Taihu Lake area, or the normal application cannot be popularized due to the high cost. Especially in the rainy season in summer, there is nothing to do, and the untreated sewage is directly discharged to Taihu Lake, which also lays the foundation for the formation of blue algae in Taihu Lake after entering summer. Therefore, in view of the current water quality situation in Taihu Lake, while maintaining the discharge of industrial sewage up to standard, we use technological innovation to improve the sewage treatment process and technical level of livestock and poultry breeding sites and agricultural ecological demonstration parks along Taihu Lake, so as to improve the water quality of Taihu Lake from the source. , to further improve the ecological environment of Taihu Lake, protect the ecological environment, and achieve the goal of harmony between man and nature.

Contents of the invention

Purpose of the invention: The present invention provides a sewage treatment process for livestock and poultry breeding in Taihu Lake. The sewage treatment process has good functions of denitrification, phosphorus removal, and COD reduction, and has the advantages of simple and convenient operation and low operating cost.

Technical solution: The process of the present invention mainly adopts anaerobic pool, aerobic pool, dosing flocculation and sedimentation, and is equipped with membrane module filtration technology, which is specifically realized through the following technical solutions:

The livestock and poultry breeding sewage of the present invention sequentially passes through the concentration pool, the primary sedimentation filter pool, the anaerobic pool, the aerobic pool, the dosing flocculation sedimentation pool, and the filter pool of the membrane module device, and the purified water after filtration reaches the first-level discharge of sewage in the Taihu Lake area. standard. Its treatment process specifically includes the following steps:

1. Solid-liquid separation: The sewage is collected and flowed into the concentration pool, and the solid matter such as livestock and poultry manure is removed through the grille and the mud-water separator. The filtrate enters the primary sedimentation filter tank through the overflow pipe for treatment. The collected solid matter can be used for planting as organic Fertilizer use. At the same time, most organic matter in sewage can be removed through solid-liquid separation, reducing the load and cost of subsequent sewage treatment, and after solid-liquid separation, it can also prevent clogging of lifting pumps, pipes, and valves, which can prolong the service life of equipment.

2. Primary sedimentation filtration: After the sewage enters the primary sedimentation filter tank, it is still for 1-2 hours, and the filter filler is laid on the bottom of the tank, and the thickness of the filler is 80cm. The graded sandstone is used for preliminary adsorption and sedimentation filtration, mainly to adsorb some flocculation impurities, colloid etc.

3. Anaerobic reaction: The sewage filtered by the primary sedimentation enters the anaerobic tank through the overflow port, in which the biological contact filler of the microbial carrier and the compound microbial preparation are added in the tank, and the sewage undergoes the biological nitrification reaction for 8-12 hours.

4. Aerobic reaction: The sewage after the anaerobic reaction enters the biological contact aerobic tank through the overflow port, and the biological contact filler of the microbial carrier and the microporous aeration device are installed in the tank, and the outlet of the aeration device is installed in the biological contact well. At the bottom of the oxygen tank, the inlet of the aeration device is connected with the blower, and the contact filler is installed on the upper part of the biological contact aerobic tank. Sewage reacts in the biological contact aerobic pool for 5-8 hours.

5. Dosing flocculation and sedimentation: The sewage after biological contact with aerobic reaction enters the dosing flocculation sedimentation tank through the overflow port, firstly add alkali to adjust the pH value to 7-8, then add flocculant and coagulant respectively, and add Add water quality stabilizer for coagulation reaction for 1-2 hours, and then add fungicide for disinfection, let it stand still for 3-5 hours.

6. Filtration: After the sewage is flocculated and precipitated by adding drugs, the supernatant liquid is pumped into the membrane module device for filtration treatment. The water quality of the filtrate effluent can meet the sewage discharge standard for livestock and poultry breeding in Taihu Lake, that is, the first-level discharge standard for sewage in Taihu Lake area.

The graded sandstone of the present invention is specifically the fineness of the natural river sand is 1-3mm, the particle size of the cobblestone is 1-2cm, and the weight ratio of the sand and the cobblestone is 3:1.

The biological contact filler of the present invention adopts elastic fiber, which contains biofilm formed by microorganisms.

The composite microbial preparation of the present invention is a composite probiotic, which can be one of denitrifying bacteria, nitrifying bacteria, yeast and lactic acid bacteria, preferably nitrifying bacteria.

The alkali used for adjusting the pH value of the present invention is sodium hydroxide.

The flocculant in the present invention is one of polyacrylamide, polyaluminum chloride and ferrous sulfate, preferably polyacrylamide.

The coagulant of the present invention is one of aluminum sulfate and magnesium carbonate, preferably magnesium carbonate.

The water quality stabilizer of the present invention is a compound water treatment agent, which is prepared according to the water quality index after anaerobic and aerobic biochemical treatment, and is prepared by the following method, and the parts by weight of its raw material components are: sodium polyacrylate 25-25, polyphosphorus ferric chloride 20-25, acrylamide 45-50, 2-phospho-1,2,4-tricarboxylic butane 5-10; the preparation process is: in a heating and stirring First add 500L tap water into the medicine tank, and when the temperature rises to 20-25°C, then add sodium polyacrylate and polyphosphorus ferric chloride, and stir for 40-60 minutes at the same time, then add acrylamide, and stir for 30 minutes, and finally add 2 -Phosphate-1,2,4-butane tricarboxylate, continue to stir for 30-40 minutes until fully dissolved to obtain the required water quality stabilizer (compounded water treatment agent).

The bactericide of the present invention is one of trichloroisocyanuric acid and sodium dichloroisocyanurate, preferably trichloroisocyanuric acid.

The membrane module device of the present invention is a flat membrane module device or a hollow membrane module device, preferably a flat membrane module device.

After the flocculation and coagulation in the present invention is reacted, the generated sediment is separated by the mud-water separator, the filtrate enters the primary sedimentation filter tank for treatment, and the generated filter residue is incinerated through the incinerator.

Beneficial effects: the present invention is a process for treating livestock and poultry breeding sewage entering Taihu Lake. The combination technology of coagulation reaction and membrane module filtration, and also adopts the process of adding compound water treatment chemicals, so as to achieve the functions of efficient nitrogen removal, phosphorus removal and COD reduction. At the same time, the treatment process also has the effect of decolorization and sterilization. The operation cost and management cost of the treatment process of the invention are low, the sewage treatment effect is good, and the treated livestock and poultry breeding sewage can reach the first-level discharge standard for sewage treatment in the Taihu Lake area stipulated by the state.

Description of drawings

Fig. 1 is a kind of Taihu Lake of the present invention enters the lake livestock and poultry breeding sewage treatment process structural representation;

Fig. 2 is the schematic diagram of the structure of the aerator used in the biological contact aerobic tank;

Fig. 3 is a structural schematic diagram of a membrane module filtration device.

detailed description

Example 1

Pig breeding farm with 4,500 pigs on hand: the sewage is collected and flowed into a 150m ³ concentration pool, and the screen and mud-water separator are used to remove solid substances such as feces in the sewage. The collected solid substances are used for planting organic fertilizers, and the filtrate is overflowed The flow pipe enters the 120m ³ primary sedimentation filter tank, where the bottom of the tank is paved with graded sand and gravel with a fineness of 2-6mm and a thickness of 80cm, and stands still for 1.5 hours for preliminary adsorption and sedimentation filtration.

The sewage filtered by the primary sedimentation enters the 80m ³ anaerobic tank through the overflow port, and the sewage undergoes biological nitrification reaction for 8 hours in the anaerobic tank equipped with biological contact elastic fiber filler and compound microbial preparation nitrifying bacteria.

The sewage after the anaerobic reaction enters the 80m ³ biological contact aerobic tank through the overflow port. In the aerobic tank equipped with biological contact elastic fiber filler and microporous aeration device, the blower is turned on for microporous aeration to carry out good Oxygen reaction for 6 hours.

The sewage after biological contact with aerobic reaction enters the 80m ³ dosing flocculation sedimentation tank through the overflow port. First, the chemical metering pump is turned on to add sodium hydroxide solution with a concentration of 30%, and the pH value is adjusted to 7.1, and then the chemical metering pump is turned on respectively. Add 50L of flocculant polyacrylamide with a concentration of 5‰ and 35L of coagulant magnesium carbonate solution with a concentration of 10%. Ferric chloride, acrylamide, and 2-phosphate-1,2,4-tricarboxylic acid butane compounded water quality stabilizer 60L, carried out coagulation reaction for 0.5 hours, and then opened the chemical metering pump to add a concentration of 2% The fungicide trichloroisocyanuric acid solution 2L, after disinfection, let it stand for 3 hours.

After the sewage is flocculated and precipitated by dosing, the supernatant liquid is pumped into the flat membrane module device for filtration treatment, and the filtrate flows into the 100m ³ clear water tank and is discharged.

Example 2

Pig breeding farm with 6,000 pigs on hand: the sewage is collected and flowed into a 150m ³ concentration pool, and the solid matter such as feces in the sewage is removed by using a grille and a mud-water separator. The collected solid matter is used for planting organic fertilizers. The flow pipe enters the 120m ³ primary sedimentation filter tank, where the bottom of the tank is paved with filter packing graded sandstone with a fineness of 2-6mm and a thickness of 80cm, and stands still for 2 hours for preliminary adsorption and sedimentation filtration.

The sewage filtered by the primary sedimentation enters the 80m ³ anaerobic tank through the overflow port, and the biological nitrification reaction is carried out for 10 hours in the anaerobic tank equipped with biological contact elastic fiber filler and compound microbial preparation lactic acid bacteria.

The sewage after the anaerobic reaction enters the 80m ³ biological contact aerobic tank through the overflow port. In the aerobic tank equipped with biological contact elastic fiber filler and microporous aeration device, the blower is turned on for microporous aeration to carry out good Oxygen reaction for 8 hours.

The sewage after biological contact with aerobic reaction enters the 80m ³ dosing flocculation sedimentation tank through the overflow port. First, the chemical metering pump is turned on to add sodium hydroxide solution with a concentration of 30%, and the pH value is adjusted to 7.2, and then the chemical metering pump is turned on respectively. Add 80L of flocculant polyaluminum chloride with a concentration of 8‰, and 50L of coagulant aluminum sulfate with a concentration of 10%. Ferric chloride, acrylamide, and 2-phospho-1,2,4-tricarboxylic acid butane compounded water quality stabilizer 90L, carry out coagulation reaction for 0.5 hours, and then start the chemical metering pump to add a concentration of 2% The fungicide sodium dichloroisocyanurate solution is 3L, after disinfection, it can be left to stand for 4 hours.

After the sewage is flocculated and precipitated by dosing, the supernatant liquid is pumped into the flat membrane module device for filtration treatment, and the filtrate flows into the 100m ³ clear water tank and is discharged.

Example 3

Breeding scale broiler farm with 20,000 chickens on hand: the sewage flows into a 150m ³ concentration pool, and the screen and mud-water separator are used to remove solid substances such as feces in the sewage. The collected solid substances are used as planting organic fertilizers, and the filtrate is overflowed The flow pipe enters the 120m ³ primary sedimentation filter tank, where the bottom of the tank is paved with graded sand and gravel with a fineness of 2-6mm and a thickness of 80cm, and stands still for 1.5 hours for preliminary adsorption and sedimentation filtration.

The sewage filtered by the primary sedimentation enters the 80m ³ anaerobic tank through the overflow port, and the sewage undergoes biological nitrification reaction for 9 hours in the anaerobic tank equipped with biological contact elastic fiber filler and compound microbial preparation nitrifying bacteria.

The sewage after the anaerobic reaction enters the 80m ³ biological contact aerobic tank through the overflow port. In the aerobic tank equipped with biological contact elastic fiber filler and microporous aeration device, the blower is turned on for microporous aeration to carry out good Oxygen reaction for 7 hours.

The sewage after biological contact with aerobic reaction enters the 80m ³ dosing flocculation sedimentation tank through the overflow port. First, the chemical metering pump is turned on to add sodium hydroxide solution with a concentration of 30%, and the pH value is adjusted to 7.3, and then the chemical metering pump is turned on respectively. Add 20L of flocculant polyacrylamide with a concentration of 5‰, and 15L of coagulant magnesium carbonate solution with a concentration of 10%. Ferric chloride, acrylamide, and 2-phospho-1,2,4-tricarboxylic acid butane compounded water quality stabilizer 40L, carry out coagulation reaction for 0.5 hours, and then start the chemical metering pump to add a concentration of 2% The fungicide trichloroisocyanuric acid solution is 1.5L. After disinfection, let it stand for 3 hours.

After the sewage is flocculated and precipitated by dosing, the supernatant liquid is pumped into the flat membrane module device for filtration treatment, and the filtrate flows into the 100m ³ clear water tank and is discharged.

After the present invention adopts the new process and the examples, the effluent water quality reaches the following indicators:

The present invention and through embodiment 1～3, the sewage water quality index after adopting the new technology and new method treatment reaches as shown in the following chart, and reaches the first-level discharge standard for sewage treatment in the Taihu Lake area stipulated by the state:

The present invention provides an idea and method, and there are many methods and approaches for realizing the technical solution, and the above descriptions are only preferred implementation modes of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention. Each component that is not specified in can be realized by existing technology.

Claims (10)

1. one kind enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: it comprises the following steps,

(1) separation of solid and liquid: sewage collects inflow centralized pool, by grid and mud, removes animal dung solid matter, and filtrate enters primary precipitation filtering ponds through overflow pipe and processes；

(2) primary precipitation filters: after sewage enters primary clarifier, static 1-2 hour, wherein lays filter packing bottom pond, and depth of packing is the graded sand and stone of 80cm, tentatively adsorbs and precipitates filtration；

(3) anaerobic reaction: the sewage after primary precipitation filters is entered in anaerobic pond by overfall, wherein arranges the biological contact filler of microbe carrier and adds plyability microorganism formulation in pond, sewage reacts 8-12 hour through biological nitration；

(4) aerobic reaction: the sewage after anaerobic reaction enters in biological Aerobic Pond by overfall, contact filler and the microporous aeration device of microbe carrier are set in pond, wherein the outlet of aerator is arranged on the bottom of biological Aerobic Pond, the import of aerator is connected with air blast, contact filler is arranged at the body top, pond of biological Aerobic Pond, and sewage reacts 5-8 hour in biological Aerobic Pond；

(5) dosing flocculation sediment: the sewage aerobic through biological enters in dosing flocculation sedimentation tank by overfall, first alkali regulation pH value is added to 7-8, add flocculant, coagulant the most respectively, and add water quality stabilizer and carry out coagulating 1-2 hour, add bactericide the most again to carry out disinfection so that it is static 3-5 hour；

(6) membrane filtration processes: the sewage after dosing flocculation sediment, and supernatant liquid enters film component device by pump and carries out filtration treatment, and filtrate is discharged after flowing into clear water reserviors.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterized in that: described graded sand and stone, the fineness being specially natural river sand is 1-3mm, and cobblestone granularity is 1-2cm, and its medium sand is 3:1 with the weight of cobblestone.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: described biological contact filler uses elastomer, wherein comprises the biomembrane that microorganism is formed.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: described plyability microorganism formulation is compound probiotic, specially denitrifying bacterium, nitrifier, saccharomycete, lactic acid bacteria one therein.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: the alkali that described regulation pH value uses is NaOH.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: the flocculant of described employing is polyacrylamide, aluminium polychloride, ferrous sulfate one therein.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: the coagulant of described employing is aluminum sulfate or magnesium carbonate.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterized in that: described water quality stabilizer is compounding water treatment agent, the preparation of medicament is carried out according to the water quality index after anaerobic-aerobic biochemical treatment, its water quality stabilizer prepares by the following method, the weight portion of its each raw material components is: Sodium Polyacrylate 25-25, poly-phosphorus iron chloride 20-25, acrylamide 45-50,2-phosphate-1,2,4-butane tricarboxylate 5-10；Preparation technology is: be firstly added 500L running water in the medicament barrel heating, stirring, during by being warming up to 20-25 DEG C, it is separately added into Sodium Polyacrylate, poly-phosphorus iron chloride again, is stirred 40-60min simultaneously, then adds acrylamide, and stir 30min, it is eventually adding 2-phosphate-1,2,4-butane tricarboxylates, continue stirring 30-40min to dissolve to abundant, i.e. obtain required water quality stabilizer and compound water treatment agent.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: described bactericide is sym-closene or sodium dichloro cyanurate.

One the most according to claim 1 enters lake livestock and poultry cultivation sewage treatment process for Taihu Lake, it is characterised in that: described film component device is plate film assembly device or hollow membrane assembly apparatus.