CN108947135B - Integrated treatment method for livestock and poultry breeding wastewater - Google Patents
Integrated treatment method for livestock and poultry breeding wastewater Download PDFInfo
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Abstract
The invention relates to the technical field of livestock and poultry breeding wastewater treatment, and aims to provide an integrated treatment method for livestock and poultry breeding wastewater. The technical scheme adopted is as follows: s1, detecting the water quality of the wastewater; s2, stirring, and pretreating the wastewater according to the quality of the wastewater; s3, sequentially carrying out anoxic and aerobic treatment, wherein a nitrifying agent is added in the aerobic treatment process, and the dissolved oxygen amount, the pH value and the reflux ratio of the mixed solution in the treatment process are controlled; s4, vertical flow precipitation and sludge-water separation; s5, stirring the clear water obtained by separation in the step S4, and performing coagulation and decoloration treatment; s6, precipitating and separating mud and water from the wastewater after the coagulation and decoloration treatment; and S7, discharging the sludge obtained by precipitation to a sludge storage pool. The whole treatment method is simple and easy to implement, stable in water outlet, high in treatment efficiency and low in construction and operation cost.
Description
Technical Field
The invention relates to the technical field of livestock and poultry breeding wastewater treatment, in particular to an integrated treatment method for livestock and poultry breeding wastewater.
Background
In recent years, the large-scale breeding of China is rapidly developed, and meanwhile, the influence of the generation of a large amount of livestock and poultry breeding wastewater on the environment is increasingly prominent. At present, the culture pollution becomes the largest source of agricultural non-point source pollution. According to statistics of relevant departments, the chemical oxygen demand emission of livestock and poultry farms and specialized culture households with 24 provinces in China accounts for more than 90% of the total local agricultural non-point source emission. The method is characterized in that the amount of wastewater/biogas slurry discharged by large-scale farms every day is large and centralized (Yuancei, Dong hong Ming, Zhang Wan Qin, etc.. the research on the membrane concentration treatment technology of the aquaculture wastewater/biogas slurry is advanced [ J ]. China biogas, 2018, 36(2):25-33.), the wastewater/biogas slurry contains pollutants such as high-concentration organic matters, SS, ammonia nitrogen and the like, and simultaneously contains a large amount of other pollutants such as heavy metals, residual veterinary drugs, pathogens and the like, and if the wastewater/biogas slurry is discharged to the environment or is directly used for agriculture without being treated, the wastewater/biogas slurry can cause serious pollution to the local ecological environment and farmlands.
Aiming at the treatment method and process of livestock and poultry breeding wastewater, the application of an anaerobic-aerobic combined process is the most common at present. For example, the patent CN101921044B of the invention discloses a method for treating livestock and poultry wastewater in a two-stage anaerobic-tower filter, which treats livestock and poultry breeding wastewater in an anaerobic-aerobic alternative operation mode; an integrated anaerobic-wetland treatment device is disclosed in the patent CN1315743C issued by the granted invention. Wherein, high-concentration organic matters in the livestock and poultry breeding wastewater are partially converted into methane through anaerobic treatment, and the discharged wastewater is subjected to dry-wet alternate treatment of the artificial wetland to realize nitrification-denitrification.
In the actual treatment process of livestock and poultry breeding wastewater, the conventional biological treatment process is often difficult to meet the treatment requirements, and the application of the membrane module can achieve a good removal effect, for example, granted patents CN207210210U, CN207047067U, CN206289127U, CN203159398U and the like all adopt the membrane module to treat the wastewater. However, the components in the livestock and poultry breeding wastewater are complex, and the SS and colloidal substances are more, so that membrane pollution is easily caused, and the wastewater treatment cost is increased. Although the advanced treatment of the livestock and poultry breeding wastewater can be realized by the application of some advanced oxidation technologies such as photocatalytic oxidation (CN207091218U), Fenton oxidation (CN207047067U), ozone oxidation (CN206486337U), electrochemical oxidation (CN207552136U) and the like, the advanced treatment is limited to technical and economic factors, and the large-scale application is mostly difficult to realize.
In addition, although the operation cost is low by applying treatment units such as artificial wetlands, oxidation ponds (CN207091218U) and the like, the occupied area is large, and the method is not suitable for regions with strict cultivated land protection and certain land tension. Aiming at the treatment of biogas slurry wastewater, partial COD, SS, TN and TP are removed at home and abroad mainly through pretreatment technologies such as a chemical method, a catalytic oxidation method, an electrochemical method and the like; subsequently, evaporating, concentrating and membrane separating to recover resources; or further treating biogas slurry wastewater by using a combined process mainly comprising biological methods such as A/O, SBBR and artificial wetland (Piuqiong, Liulinpei, Liuchun. farm anaerobic digestion biogas slurry post-treatment technical research progress [ J ]. proceedings of Sichuan academy of technology, 2018, 31(1): 21-7.).
In conclusion, in the prior art, most of the prior art focuses on removing organic matters, ammonia nitrogen and other substances in the livestock and poultry breeding wastewater and biogas slurry, but the total nitrogen and the chromaticity cannot be efficiently removed, and the wastewater treatment device and method integrating efficient removal of COD, ammonia nitrogen, total phosphorus, total nitrogen and chromaticity and low-consumption operation are lacked. In addition, the quality of the livestock and poultry breeding wastewater is variable, most of the prior art processes adopt fixed treatment flows, corresponding adjustment and transformation aiming at different qualities of water are difficult to achieve, and the adaptability is poor.
Disclosure of Invention
The invention aims to provide the integrated treatment method for the livestock and poultry breeding wastewater, which has the advantages of simple structure, good treatment effect and low treatment cost.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: an integrated treatment method of livestock and poultry breeding wastewater comprises the following steps:
s1, detecting the water quality of the wastewater;
s2, stirring, and pretreating the wastewater according to the quality of the wastewater;
s3, sequentially carrying out anoxic and aerobic treatment, wherein a nitrifying agent is added in the aerobic treatment process, and the dissolved oxygen amount, the pH value and the reflux ratio of the mixed solution in the treatment process are controlled;
s4, precipitating and separating mud and water;
s5, stirring and coagulating the supernatant separated in the step S4 for decoloring;
s6, precipitating and separating mud and water from the wastewater after the coagulation and decoloration treatment;
and S7, discharging the sludge obtained by precipitation to a sludge storage pool.
Preferably, when the SS in the wastewater is high, the steps S3, S4 are exchanged with the steps S5, S6.
Preferably, the mass volume ratio of the added nitrifying bacteria agent in the aerobic treatment process is 2-5%.
Preferably, part of the sludge obtained by vertical flow sedimentation is returned to anoxic and aerobic treatment.
Preferably, the sludge obtained by precipitation after partial coagulation and decoloration treatment is sent back to the coagulation and decoloration treatment.
Preferably, the filler used in the anoxic and aerobic processes is one of combined filler or suspended filler; the design interval of the combined filler is 150-200mm, and the material is PP + hydroformylation yarn; the adding amount of the suspended filler is 5-8% of the volume of the tank body used in the anoxic and aerobic treatment process.
Preferably, the dissolved oxygen in the anoxic treatment process is controlled to be 0.5-1.0mg/L, and the dissolved oxygen in the aerobic process is controlled to be 2-4 mg/L; the reflux ratio of the mixed solution is 100 to 400 percent.
Preferably, the filler used in the anoxic and aerobic treatment process is adjusted according to the data obtained by the detection in step S1.
Preferably, the adopted device comprises an adjusting tank, a device room, an anoxic tank, an aerobic tank, a vertical flow sedimentation tank, a coagulation and decoloration tank and an inclined plate sedimentation tank; a dosing device, a fan, a first reflux pump, a second reflux pump, a third reflux pump, two pH online monitors, two DO online monitors and a control cabinet are arranged in the equipment room; the fan, the first reflux pump, the second reflux pump, the third reflux pump, the dosing device, the pH online monitor and the DO online monitor are respectively and electrically connected with the control cabinet, and the dosing device is respectively connected with the regulating tank and the coagulation and decoloration tank; the water outlet of the regulating tank is connected with an anoxic tank, the water outlet of the anoxic tank is connected with an aerobic tank, a bypass is arranged between the anoxic tank and the aerobic tank and is connected with a first reflux pump, the aerobic tank is connected with a vertical flow sedimentation tank, the vertical flow sedimentation tank is respectively connected with the anoxic tank and the aerobic tank through a second reflux pump, the vertical flow sedimentation tank is connected with a coagulation and decoloration tank, the coagulation and decoloration tank is connected with an inclined plate sedimentation tank, the vertical flow sedimentation tank and the inclined plate sedimentation tank are connected with a sludge storage tank, and the connection among the tank bodies is detachable; still be provided with the bypass between inclined plate sedimentation tank and the coagulating and decolorizing pond and link to each other with the third backwash pump, the sense terminal of pH on-line monitoring appearance sets up respectively in oxygen deficiency pond, aerobic tank, the sense terminal of DO on-line monitoring appearance sets up respectively in oxygen deficiency pond, aerobic tank.
The invention has the beneficial effects that: the livestock and poultry breeding wastewater is subjected to anoxic and aerobic treatment in sequence, a nitrifying agent is added in the aerobic treatment process, and the dissolved oxygen content, the pH value and the reflux ratio of a mixed solution in the treatment process are controlled, so that pollutants such as chromaticity, SS, organic matters, ammonia nitrogen, total phosphorus and the like of the livestock and poultry breeding wastewater can be effectively removed; the coagulation and decoloration treatment can effectively reduce the effluent chromaticity and the total phosphorus concentration, and has the advantages of short flow, simple operation, high treatment efficiency, good treatment effect, lower construction and operation cost and the like. Meanwhile, the process flow is adjusted according to the quality of the wastewater, so that the method is suitable for treating the livestock and poultry breeding wastewater with different water qualities. In addition, the biochemical reaction can be controlled more accurately through the backflow of the mixed liquid and the online monitoring of the pH and the DO; the sludge generated by the coagulation and decoloration treatment partially flows back, so that the consumption of coagulation and decolorant can be reduced.
Drawings
FIG. 1 is a schematic top view of an apparatus useful in the present invention;
FIG. 2 is a schematic view of the invention taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the invention taken along the plane B-B of FIG. 1;
FIG. 4 is a schematic view of a stuffing frame of an apparatus employed in the present invention;
FIG. 5 is a schematic view of the piping connections of the apparatus employed in the present invention;
FIG. 6 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings so as to facilitate the understanding of the present invention by those skilled in the art, wherein the connections between the tanks are connected through corresponding pipes, pumps, and valves, and the electrical components are connected through wires, which will not be described in detail in the specification.
As shown in fig. 1-5, an integrated treatment device for livestock and poultry breeding wastewater, which comprises a main tank body made of glass fiber reinforced plastic plates, and a baffle plate arranged in the main tank body to separate the main tank body into: a pretreatment unit, a biochemical treatment unit, a physicochemical treatment unit, an equipment room 2 and a sludge storage tank 5. The pretreatment unit is mainly used for adjusting the water quality and the water quantity entering the biochemical treatment unit, and can be changed into a simple ammonia stripping tank when the ammonia nitrogen concentration in inlet water is high; the biochemical treatment unit can remove high-concentration organic matters, SS, ammonia nitrogen, total nitrogen and chromaticity; the physicochemical treatment unit can remove organic matters difficult to biodegrade, total phosphorus and chromaticity. The pretreatment unit is an adjusting tank 1, the biochemical treatment unit comprises an anoxic tank 3, an aerobic tank 4 and a vertical flow sedimentation tank 8, and the physicochemical treatment unit comprises a coagulation and decoloration tank 6 and an inclined plate sedimentation tank 7.
A water inlet pump, a dosing device 13, a fan 17, a first reflux pump 9, a second reflux pump 10, a third reflux pump 11, two pH on-line monitors 14, two DO on-line monitors 15 and a control cabinet 12 are arranged in the equipment room 2. The fan 17, the first reflux pump 9, the second reflux pump 10, the third reflux pump 11, the dosing device 13, the pH online monitor 14 and the DO online monitor 15 are respectively electrically connected with the control cabinet 12. That is to say, the electrical equipment in the whole system is controlled by the control cabinet 12, which is convenient for the control and automatic operation of the system. The acid/alkali liquor, the decolorant, the coagulant and the nitrobacter (the microbial inoculum described in the invention patent with the publication number of CN104164386A contains a large amount of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB), and a small amount of microorganisms such as heterotrophic bacteria, ammonifying bacteria, denitrifying bacteria) are added into the dosing device 13, namely the dosing device 13 comprises an acid or alkali storage container, a coagulant storage container, a decolorant storage container, a nitrobacter storage container and corresponding metering pumps, and the dosing device 13 is respectively connected with the regulating tank 1 and the coagulation and decoloration tank 6. It can be understood that an operator can control the dosing device 13 according to the actual water quality condition of the wastewater, add acid/alkali liquor with corresponding concentration and corresponding flow into the regulating tank 1, add coagulant and decolorant with corresponding concentration and corresponding flow into the coagulation and decoloration tank 6, and add nitrifying agent with corresponding flow into the aerobic tank 4 (the denitrification efficiency of the livestock and poultry breeding wastewater can be improved, and the start time of the short-cut nitrification and denitrification can be shortened).
In addition, the outlet of the adjusting tank 1 is sequentially connected with an anoxic tank 3 and an aerobic tank 4, and a bypass is arranged between the anoxic tank 3 and the aerobic tank 4 and is connected with a first reflux pump 9. The aerobic tank 4 is connected with the vertical flow sedimentation tank 8, and the vertical flow sedimentation tank 8 is respectively connected with the anoxic tank 3 and the aerobic tank 4 through a second reflux pump 10 and corresponding pipe valves. The vertical flow sedimentation tank 8 is connected with the coagulation and decoloration tank 6, the coagulation and decoloration tank 6 is connected with the inclined plate sedimentation tank 7, and the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 are connected with the sludge storage tank 5. A bypass is arranged between the inclined plate sedimentation tank 7 and the coagulation and decoloration tank 6 and is connected with a third reflux pump 11. The detection ends of the pH on-line monitor 14 are respectively arranged in the anoxic tank 3 and the aerobic tank 4, and the detection ends of the DO on-line monitor 15 are respectively arranged in the anoxic tank 3 and the aerobic tank 4.
Specifically, the mixed liquid can be subjected to mud-water separation by the vertical flow sedimentation tank 8, the supernatant is conveyed to the coagulation and decoloration tank 6 through an overflow tank or a corresponding pipeline, and the sludge is precipitated at the bottom of the vertical flow sedimentation tank 8. The first reflux pump 9 can pump the mixed liquor passing through the aerobic tank 4 back to the anoxic tank 3; the second reflux pump 10 can pump the sludge at the bottom of the vertical sedimentation tank 8 back to the anoxic tank 3 and the aerobic tank 4, thereby realizing the circular treatment of the mixed liquor and the sludge and ensuring the removal rate of high-concentration organic matters, SS, ammonia nitrogen, total nitrogen, chromaticity and the like. In addition, the wastewater treated by the coagulation and decoloration tank 6 is sent to an inclined plate sedimentation tank 7 through a corresponding pump and a corresponding pipeline, and the inclined plate sedimentation tank 7 carries out mud-water separation on the wastewater; the separated supernatant is discharged through an overflow groove, and a part of sludge at the bottom of the tank is pumped back into the coagulation and decoloration tank 6 through a third reflux pump so as to reduce the use amount of a coagulant and a decolorant. And finally, pumping the residual sludge in the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 into the sludge storage tank 5 through a sewage pump 31.
Further, aeration devices are arranged at the bottoms of the regulating tank 1, the anoxic tank 3 and the aerobic tank 4, and each aeration device comprises a diaphragm type microporous aeration disc 16. The size of the aeration disc 16 is phi 215mm, the installation distance is 500mm, the installation height of the surface from the bottom of the tank is 200mm and 270mm, and the service area is 0.25-0.55m2And the aeration disc 16 is connected with a fan 17. It should be understood that the pH and DO in the anoxic tank 3 and the aerobic tank 4 can be monitored in real time by the pH on-line monitor 14 and the DO on-line monitor 15, so that the dissolved oxygen in the oxygen tank 3 is controlled to be 0.5-1.0mg/L, the dissolved oxygen in the aerobic tank 4 is controlled to be 2-4mg/L, and the reflux ratio of the mixed liquid is set to be 100-400%; thereby realizing short-cut nitrification-denitrification, improving the total nitrogen removal efficiency and reducing the treatment cost. Moreover, when the ammonia nitrogen concentration of the treated sewage is higher, the gas path valve of the regulating tank can be controlled to increase the gas distribution amount of the regulating tank, and ammonia stripping is carried out by matching with the added alkali liquorThereby adjusting the carbon-nitrogen ratio of the wastewater.
Furthermore, the anoxic tank 3 and the aerobic tank 4 are both provided with fillers, and the fillers are combined fillers or suspended fillers. The design interval of the combined filler is 150-200mm, the material is PP + hydroformylation yarn, and the specification is phi 150 multiplied by 100mm (80). The combined packing is arranged on a non-fixed packing frame 32, the height design size of the packing frame 32 is that the upper part is 100mm lower than the water surface of the tank body, the bottom part is 300-400mm higher than the bottom part of the tank body, and the distance between the periphery and the tank body is 50-100mm, so that the packing frame 32 and the combined packing can be conveniently detached. In addition, the adding volume of the suspended filler is 5-8% of the volume of the tank body, so as to ensure the effect of wastewater treatment.
Further, a stirring device is arranged in the coagulation and decoloration tank 6, and the stirring device comprises a mechanical stirring and aeration stirring device. Wherein, the mechanical stirring device is provided with a stirring blade on a motor rotating shaft, the aeration stirring device is an aeration disc 16 arranged at the bottom of the coagulation and decoloration tank 6, and the aeration disc 16 is connected with a fan 17. That is, the coagulation and decoloration tank 6 stirs the sewage in the tank body by means of mechanical stirring and aeration stirring; thereby improving the removal efficiency of the organic matters difficult to biodegrade, the total phosphorus and the chromaticity.
Further, the control cabinet 12 is constituted by a PLC system, and is used for controlling each electric device, and is divided into a manual mode and an automatic mode, and an operation time can be set. Moreover, the valves for controlling the air quantity and the water quantity of each part are all arranged at the position convenient for operation.
In addition, the wastewater treatment process can be adjusted and changed according to the difference of the quality of the livestock and poultry breeding wastewater. When the inflow water is detected to have high ammonia nitrogen concentration and carbon nitrogen ratio is not adjusted, the blower 17 and the dosing device 13 can be started to adjust the pH value of the wastewater to be alkaline (about pH 11), ammonia nitrogen in the wastewater is removed by blowing, so that the effect of adjusting the carbon nitrogen ratio of the wastewater is achieved, and the treatment process is shown in figure 6 a. When the inlet water is detected to have high SS content, switching a pipeline and a corresponding valve, leading the coagulation and decoloration 6 pool, namely, after the wastewater is regulated by the regulating pool 1, firstly inputting the wastewater into the coagulation and decoloration pool 6, and then starting the dosing device 13 to remove part of solid SS, total phosphorus and chromaticity; finally, the wastewater enters the anoxic tank 3 and the aerobic tank 4 for further treatment, and the treatment process is shown in figure 6 b. Meanwhile, the fillers in the anoxic tank 3 and the aerobic tank 4 can be replaced according to the actual wastewater treatment condition, and the biochemical treatment unit is changed into one of the conventional activated sludge process (without filler), the biological contact oxidation process (combined filler), the IFAS process (combined filler) and the MBBR process (suspended filler) so as to meet the treatment requirements of different water qualities.
The following further explains the water outlet condition of the livestock and poultry breeding wastewater treated by the device by combining with specific embodiments.
Example 1
The method comprises the following operation steps:
1. and detecting the quality of the inlet water.
2. Switching on a power supply, starting a main switch, turning on a water inlet pump 30, pumping wastewater through a water inlet 33, adjusting the water inflow, after the flow is adjusted, opening an air flow valve of an adjusting tank 1 and a fan 17, and uniformly mixing the wastewater in an aeration stirring mode; then opening an acid/alkali liquor adding switch, adjusting the concentration of the medicament and the flow rate of a corresponding metering pump, and adding acid/alkali liquor into the adjusting tank 1; and finishing pretreatment of the inlet water.
3. Opening corresponding pump valves to enable the mixed liquid to enter an anoxic tank 3 and an aerobic tank 4 from the regulating tank 1 in sequence; opening corresponding valves of the anoxic tank 3 and the aerobic tank 4, and adjusting and controlling aeration rate according to the flow of the wastewater; and starting the first reflux pump 9 and the second reflux pump 10, and determining the reflux amount of the mixed liquor and the sludge according to the requirement of the treated water quality. Adding a certain amount of nitrifying bacteria agent into the aerobic pool 4, dynamically detecting and adjusting the pH value and DO concentration in the anoxic pool 3 and the aerobic pool 4 through the pH on-line monitor 14 and the DO on-line monitor 15, controlling the occurrence of short-range nitrification-denitrification in the biochemical treatment process, and finishing anoxic and aerobic biochemical treatment.
4. After the mud-water mixture in the aerobic tank 4 is subjected to mud-water separation through the vertical flow sedimentation tank 8, part of the sludge flows back to the anoxic tank 3 and the aerobic tank 4 through the second reflux pump 10, and the supernatant flows to the coagulation and decoloration tank 6 through the overflow tank.
5. Starting a stirring device in the coagulation and decoloration tank 6; and simultaneously, starting a dosing device 13, and adding a coagulant and a decolorant into the coagulation and decoloration tank 6.
6. The wastewater treated by the coagulation and decoloration tank 6 enters an inclined plate sedimentation tank 7 for mud-water separation, and supernatant is discharged through an overflow tank; and starting a third reflux pump 11, adjusting the flow on a reflux pipeline, and refluxing the materialized sludge part to the coagulation and decoloration tank 6 so as to reduce the use amount of a coagulant and a decolorant.
7. The residual sludge in the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 is discharged to the sludge storage tank 5 through a sewage pump 31.
Specifically, under the condition that the carbon and nitrogen of the inlet water are relatively appropriate (COD: TN ≈ 10:1), the biochemical treatment unit is not filled with the filler, namely, the traditional activated sludge process is adopted, and the process flow is shown in FIG. 6 a. Simultaneously, the DO concentration in the anoxic tank 3 is controlled to be 0.5mg/L, the DO concentration in the aerobic tank 4 is controlled to be 2.0-3.5mg/L, and the pH value is 7.8-8.6; the reflux ratio of the mixed solution is 200 percent; hydraulic Retention Time (HRT) was set to 5d, Sludge Retention Time (SRT) was set to 7 d; the temperature range is 25-28 ℃; the addition amount of the nitrifying bacteria agent is 2-5% (mass volume ratio, w/v); the addition amounts of the coagulant and the decolorant are respectively 200mg/L and 150 mg/L. The effects of the embodiment are shown in Table 1.
TABLE 1
Example 2:
in the embodiment, the inlet water has high SS content, the coagulation and decoloration tank 6 and the inclined plate sedimentation tank 7 are arranged in front, namely the operation steps 5 and 6 in the embodiment 1 are replaced before the step 3, and the rest is unchanged; in addition, the COD of the inlet water is high, the biochemical treatment unit adopts a combined filler, namely an IFAS process, and the process flow is shown in figure 6 b. Simultaneously, the DO concentration in the anoxic tank 3 is controlled to be 0.5-0.8mg/L, the DO concentration in the aerobic tank 4 is controlled to be 2.2-3.8mg/L, and the pH value is 7.2-8.2; the reflux ratio of the mixed liquid is set to 250%; hydraulic Retention Time (HRT) was set to 5d, Sludge Retention Time (SRT) was set to 7 d; the temperature range is 25-30 ℃; the addition amount of the nitrifying bacteria agent is 2-5% (w/v); the addition amounts of the coagulant and the decolorant are respectively 300mg/L and 200 mg/L. The effects of the embodiment are shown in Table 2.
TABLE 2
Example 3:
in the embodiment, the carbon-nitrogen ratio of the inlet water is about 5:1, the inlet water is wastewater with low carbon-nitrogen ratio, the pH is adjusted to about 11 by adding alkali liquor into an adjusting tank, namely, on the basis of the embodiment 1, the water quality in the step 2 is adjusted to about 11, so that the carbon-nitrogen ratio of the inlet water is adjusted; the biochemical treatment unit adopts combined packing, and the rest steps are kept unchanged, namely, a contact oxidation process is adopted, and the process flow is shown in figure 6 a. Simultaneously, the DO concentration in the anoxic tank 3 is controlled to be 0.5-0.8mg/L, the DO concentration in the aerobic tank is controlled to be 2.6-3.8mg/L, and the pH ranges are 7.6-8.3; the reflux ratio of the mixed liquid is set to be 200 percent; hydraulic retention time HRT is 5d, SRT is 7 d; the temperature range is 25-30 ℃; the addition amount of the nitrifying bacteria agent is 2-5% (w/v); the addition amounts of the coagulant and the decolorant are respectively 300mg/L and 150 mg/L. The effects of the embodiment are shown in Table 3.
TABLE 3
Example 4:
in the embodiment, the temperature range of the wastewater is 15-19 ℃, and the lower temperature has certain inhibition effect on the activity of microorganisms. On the basis of example 1, the biochemical treatment unit adopts (suspended filler), and the rest steps are kept unchanged, namely, the MBBR process is adopted to reduce the influence of low temperature on the microbial activity, and the process flow is shown as attached figure 6 a. Meanwhile, the DO concentration in the anoxic tank 3 is controlled to be 0.5-1.0mg/L, the DO concentration in the aerobic tank is controlled to be 3.0-4.0mg/L, and the pH is 7.8-8.2; the reflux ratio of the mixed liquid is set to 300 percent; HRT 8d, SRT 10 d; the addition amount of the nitrifying bacteria agent is 2-5% (w/v); the addition amounts of the coagulant and the decolorant are 250mg/L and 150mg/L respectively. The effects of the embodiment are shown in Table 4.
TABLE 4
It should be noted that the inventors did not only experiment with the above parameters, but also showed that the above parameters and results are representative, and the examples and comparative examples were chosen for the sake of space. Wherein the unit of each data is mg/L. According to tables 1-4, the effluent quality of the livestock wastewater treated by the treatment method disclosed by the invention is as follows: COD is less than or equal to 246mg/L, SS is less than or equal to 85mg/L, ammonia nitrogen is less than or equal to 12.1mg/L, total nitrogen is less than or equal to 65.7mg/L, total phosphorus is less than or equal to 3.3mg/L, and other indexes except COD all reach the standard of discharge Standard of pollutants for livestock and poultry Breeding (draft of secondary research).
The above examples are merely intended to illustrate the objects, aspects and advantages of the present invention in further detail, and it should be understood that the present invention is not limited in scope by the specific embodiments. It will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (3)
1. An integrated treatment method of livestock and poultry breeding wastewater and biogas slurry comprises the following steps:
s1, detecting the water quality of the wastewater;
s2, stirring, and pretreating the wastewater according to the quality of the wastewater;
s3, sequentially carrying out anoxic and aerobic treatment, wherein a nitrifying agent is added in the aerobic treatment process, and the dissolved oxygen amount, the pH value and the reflux ratio of the mixed solution in the treatment process are controlled;
s4, precipitating and separating mud and water; returning part of sludge obtained by vertical flow precipitation to anoxic and aerobic treatment; pumping the mixed liquor in the aerobic treatment back to the anoxic treatment;
s5, stirring and coagulating the supernatant separated in the step S4 for decoloring;
s6, precipitating and separating mud and water from the wastewater after the coagulation and decoloration treatment; returning part of the sludge obtained by precipitation after the coagulation and decoloration treatment to the coagulation and decoloration treatment;
s7, discharging the residual sludge obtained by the precipitation in the step S4 and the residual sludge obtained by the precipitation in the step S6 to a sludge storage pool;
the dissolved oxygen in the anoxic treatment process is controlled to be 0.5-1.0mg/L, and the dissolved oxygen in the aerobic process is controlled to be 2-4 mg/L; the reflux ratio of the mixed solution is 100-400 percent, so that shortcut nitrification-denitrification is realized, and the mass volume ratio of the nitrifying bacteria added in the aerobic treatment process is 2-5 percent; the pH is 7.8-8.6, and the temperature is 25-28 ℃; when the SS content in the wastewater is high, the steps S5 and S6 are changed to the step S3, the pH is = 7.2-8.2, and the temperature is 25-30 ℃.
2. The integrated treatment method of livestock and poultry breeding wastewater and biogas slurry according to claim 1, characterized in that: the filler adopted in the anoxic and aerobic processes is one of combined filler or suspended filler; the design interval of the combined filler is 150-200mm, and the material is PP + hydroformylation yarn; the adding amount of the suspended filler is 5-8% of the volume of the tank body used in the anoxic and aerobic treatment process.
3. The integrated treatment method of livestock and poultry breeding wastewater and biogas slurry according to claim 1, characterized in that: and (5) adjusting the fillers used in the anoxic and aerobic treatment processes according to the data obtained by the detection in the step S1.
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