CN108947135A - A kind of livestock breeding wastewater integral treatment method - Google Patents

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: S1, detect the water quality of wastewater; S2, stir, pretreat wastewater according to the quality of wastewater; S3, perform anoxic and aerobic treatment in sequence, in which nitrifying bacteria are added in the aerobic treatment process, and control the treatment process Dissolved oxygen, pH, and reflux ratio of the mixed solution; S4, vertical flow sedimentation, mud-water separation; S5, stirring, coagulation and decolorization of the clear water obtained in step S4; S6, precipitation of wastewater after coagulation and decolorization, Separation of mud and water; S7. Discharging the sludge obtained from sedimentation to a mud storage tank. The whole treatment method is simple and easy, the water output is stable, the treatment efficiency is high, and the construction and operation costs are low.

Description

An integrated treatment method for livestock and poultry breeding wastewater

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 technique

In recent years, my country's large-scale breeding has developed rapidly, and at the same time, the impact of a large amount of livestock and poultry breeding wastewater on the environment has become increasingly prominent. At present, farming pollution has become the largest source of agricultural non-point source pollution. According to the statistics of relevant departments, the COD emissions of livestock and poultry farms and specialized breeding households in 24 provinces across the country account for more than 90% of the total local agricultural non-point source emissions. The amount of waste water/biogas slurry discharged by large-scale farms every day is large and concentrated (Yue Caide, Dong Hongmin, Zhang Wanqin, et al. Research progress in membrane concentration treatment technology for aquaculture sewage/biogas slurry [J]. China Biogas, 2018, 36(2): 25 -33.), wastewater/biogas slurry contains high concentrations of organic matter, SS, ammonia nitrogen and other pollutants, and also contains a large number of other pollutants such as heavy metals, residual veterinary drugs and pathogens, etc., if it is not treated, it will be discharged to the environment or directly for agricultural use , will cause serious pollution to the local ecological environment and farmland.

For the treatment methods and processes of livestock and poultry wastewater, the anaerobic-aerobic combined process is currently the most widely used. For example, the authorized invention patent CN101921044B has announced a two-stage anaerobic-tower filter livestock and poultry wastewater treatment method, which treats livestock and poultry breeding wastewater through anaerobic-aerobic alternate operation mode; the authorized invention patent CN1315743C has announced an integrated Anaerobic - wetland treatment device. Among them, the high-concentration organic matter in livestock and poultry breeding wastewater is partially converted into methane through anaerobic treatment, and the discharged wastewater is treated with dry-wet alternate treatment in artificial wetlands to realize nitrification-denitrification.

In the actual treatment of livestock and poultry wastewater, conventional biological treatment processes are often difficult to meet the treatment requirements, and the application of membrane modules can achieve a better removal effect, such as authorized patents CN207210210U, CN207047067U, CN206289127U, CN203159398U, etc. all use membrane modules to treat such wastewater. However, the composition of livestock and poultry wastewater is complex, and there are many SS and colloidal substances, which are easy to cause membrane fouling and increase the cost of wastewater treatment. Although the application of some advanced oxidation technologies such as photocatalytic oxidation (CN207091218U), Fenton oxidation (CN207047067U), ozone oxidation (CN206486337U), electrochemical oxidation (CN207552136U) can realize the advanced treatment of livestock and poultry breeding wastewater, it is limited by technology and economy factors, most of them are difficult to achieve large-scale application.

In addition, although the operating cost of artificial wetlands, oxidation ponds (CN207091218U) and other treatment units are low, they occupy a large area and are not suitable for areas with strict protection of cultivated land and some land shortages. For the treatment of biogas slurry wastewater, some COD, SS, TN and TP are mainly removed through pretreatment technologies such as chemical method, catalytic oxidation and electrochemical method at home and abroad; resources are subsequently recovered by evaporation and concentration and membrane separation; or by A/O, SBBR, artificial wetland and other biological methods to further treat biogas slurry wastewater (Guan Xiuqiong, Liu Linpei, Liu Chun. Research progress on post-treatment technology of anaerobic digestion biogas slurry in farms [J]. Journal of Sichuan Institute of Technology, 2018, 31(1):21-7.).

In summary, most of the existing technologies focus on the removal of organic matter and ammonia nitrogen in livestock and poultry wastewater and biogas slurry, but cannot efficiently remove total nitrogen and chroma. Currently, there is still a lack of collection of COD, ammonia nitrogen, total phosphorus, total nitrogen and A wastewater treatment device and method integrating high-efficiency chroma removal and low-consumption operation. In addition, the water quality of livestock and poultry breeding wastewater is changeable, and most of the existing technical processes adopt fixed treatment processes, which make it difficult to adjust and transform correspondingly for different water qualities, and have poor adaptability.

Contents of the invention

The purpose of the present invention is to provide an integrated treatment method for livestock and poultry breeding wastewater with simple structure, good treatment effect and low treatment cost.

In order to achieve the purpose of the above invention, the technical solution adopted in the present invention is: an integrated treatment method for livestock and poultry breeding wastewater, the steps include:

S1. Detect the water quality of the wastewater;

S2, stirring, pretreating the wastewater according to the quality of the wastewater;

S3. Carry out anoxic and aerobic treatments in sequence, wherein a nitrifying bacteria agent is added in the aerobic treatment process, and the dissolved oxygen amount, pH and reflux ratio of the mixed solution are controlled during the treatment process;

S4, sedimentation, mud-water separation;

S5. The supernatant obtained in the separation step S4 is stirred, coagulated and decolorized;

S6. Sedimentation and mud-water separation of the wastewater after coagulation and decolorization treatment;

S7. Discharging the sludge obtained from sedimentation to a sludge storage tank.

Preferably, when the SS in the wastewater is high, the order of steps S3, S4 and S5, S6 is reversed.

Preferably, the mass volume ratio of the nitrifying bacteria agent added during the aerobic treatment is 2-5%.

Preferably, part of the sludge obtained through vertical flow sedimentation is returned to anoxic and aerobic treatment.

Preferably, the sludge obtained after the partial coagulation and decolorization treatment is sent back to the coagulation and decolorization treatment.

Preferably, the filler used in the anoxic and aerobic processes is a combination filler or a suspended filler; the designed spacing of the combined filler is 150-200mm, and the material is PP+formylated silk; the suspended filler is added The amount is 5-8% of the pool body volume used in anoxic and aerobic treatments.

Preferably, the dissolved oxygen is controlled at 0.5-1.0 mg/L during the anoxic treatment process, and 2-4 mg/L during the aerobic process; the reflux ratio of the mixed solution is 100%-400%.

Preferably, the fillers used in the anoxic and aerobic treatments are adjusted according to the data obtained from the detection in step S1.

Preferably, the devices used include regulating tanks, equipment rooms, anoxic tanks, aerobic tanks, vertical flow sedimentation tanks, coagulation decolorization tanks, inclined plate sedimentation tanks; the equipment room is equipped with dosing devices, fans, the second A reflux pump, a second reflux pump, a third reflux pump, two pH online monitors, two DO online monitors and a control cabinet; the fan, the first reflux pump, the second reflux pump, the third reflux pump, The dosing device, pH on-line monitor, and DO on-line monitor are electrically connected to the control cabinet respectively, and the dosing device is connected to the adjustment tank and the coagulation decolorization tank respectively; the water outlet of the adjustment tank is connected to the anoxic tank, and The outlet of the oxygen tank is connected to the aerobic tank, a bypass is set between the anoxic tank and the aerobic tank to connect with the first return pump, the aerobic tank is connected to the vertical flow sedimentation tank, and the vertical flow sedimentation tank passes through the first The two reflux pumps are respectively connected to the anoxic tank and the aerobic tank, the vertical flow sedimentation tank is connected to the coagulation decolorization tank, the coagulation decolorization tank is connected to the inclined plate sedimentation tank, and the vertical flow sedimentation tank and the inclined plate sedimentation tank are connected to each other. The tank is connected to the mud storage tank, and the connections between the tanks are all detachable connections; a bypass is also provided between the inclined plate sedimentation tank and the coagulation decolorization tank to connect with the third return pump, and the pH online monitor The detection ends are respectively set in the anoxic pool and the aerobic pool, and the detection ends of the DO online monitor are respectively set in the anoxic pool and the aerobic pool.

The beneficial effects of the present invention are: livestock and poultry breeding wastewater is treated sequentially with anoxic and aerobic treatment, nitrifying bacteria are added during the aerobic treatment process, and dissolved oxygen, pH and mixed liquid reflux ratio are controlled during the treatment process, which can effectively remove livestock and poultry waste water. Pollutants such as chroma, SS, organic matter, ammonia nitrogen, total nitrogen, and total phosphorus in poultry breeding wastewater; coagulation and decolorization treatment can effectively reduce the chroma and total phosphorus concentration of the effluent, with short process, simple operation, high treatment efficiency, and The effect is good, and the construction and operation costs are relatively low. At the same time, the technological process is adjusted according to the wastewater quality, which can be applied to the treatment of livestock and poultry breeding wastewater with different water quality. In addition, through the online monitoring of mixed liquid reflux, pH, and DO, the biochemical reaction can be controlled more accurately; the partial reflux of the sludge generated by the coagulation and decolorization treatment can reduce the consumption of coagulation and decolorization agents.

Description of drawings

Fig. 1 is a top view schematic diagram of the device adopted in the present invention;

Fig. 2 is the A-A face schematic diagram of accompanying drawing 1 of the present invention;

Fig. 3 is the B-B face schematic diagram of accompanying drawing 1 of the present invention;

Fig. 4 is the packing frame schematic diagram of the device that the present invention adopts;

Fig. 5 is the pipeline connection schematic diagram of the device that the present invention adopts;

Fig. 6 is a process flow diagram of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can understand the present invention, wherein the connections between the pool bodies are all connected by corresponding pipelines, pumps and valves, and all electrical components are connected by wires. No specific instructions will be given in the manual.

As shown in Figure 1-5, an integrated treatment device for livestock and poultry breeding wastewater, the main pool body is composed of glass steel plates, and then a partition is set in the main pool body to separate it into: a pretreatment unit, a biochemical treatment unit, a physical and chemical Processing unit, equipment room 2, mud storage tank 5. The pretreatment unit is mainly used to adjust the water quality and water volume entering the biochemical treatment unit. When the concentration of ammonia nitrogen in the influent water is high, it can also be converted into a simple ammonia stripping tank; the biochemical treatment unit can remove high-concentration organic matter, SS, Ammonia nitrogen, total nitrogen, and chroma; the physicochemical treatment unit can remove refractory organic matter, total phosphorus, and chroma. The pretreatment unit is the adjustment tank 1, the biochemical treatment unit includes the anoxic tank 3, the aerobic tank 4, and the vertical flow sedimentation tank 8, and the physical and chemical treatment unit includes the coagulation decolorization tank 6 and the inclined plate sedimentation tank 7.

The equipment room 2 is equipped with a water inlet pump, a dosing device 13, a fan 17, a first return pump 9, a second return pump 10, a third return pump 11, two pH online monitors 14, and two DO online monitors 15 And control cabinet 12. The fan 17 , the first return pump 9 , the second return pump 10 , the third return pump 11 , the dosing device 13 , the pH online monitor 14 , and the DO online monitor 15 are electrically connected to the control cabinet 12 respectively. That is to say, the electrical equipment in the whole system is controlled through the control cabinet 12, which facilitates the control and automatic operation of the system. Acid/lye, decolorizing agent, coagulant, nitrifying bacteria agent (publication number is the bacteria agent recorded in CN104164386A invention patent in described dosing device 13, contains a large amount of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria ( NOB), a small amount of microorganisms such as heterotrophic bacteria, ammonifying bacteria, and denitrifying bacteria) add modules, including acid or alkali storage containers, coagulant storage containers, decolorizer storage containers, nitrifying agent storage containers and corresponding metering pumps , the dosing device 13 is connected to the regulating tank 1 and the coagulation decolorizing tank 6 respectively. It can be understood that the operator can control the dosing device 13 according to the water quality of the actual wastewater, add the acid/alkali solution of the corresponding concentration and flow rate to the regulating tank 1, and add the acid/alkali solution of the corresponding concentration and flow rate to the coagulation decolorization tank 6 Coagulant and decolorizing agent, add a corresponding flow of nitrifying bacteria agent to the aerobic pool 4 (it can improve the denitrification efficiency of livestock and poultry breeding wastewater, and shorten the start time of short-range nitrification and denitrification).

In addition, the outlet of the regulating pool 1 is connected to the anoxic pool 3 and the aerobic pool 4 in turn, and a bypass is provided between the anoxic pool 3 and the aerobic pool 4 to connect with the first return 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 the second return pump 10 and corresponding pipe valves. The vertical flow sedimentation tank 8 is connected to the coagulation decolorization tank 6 , the coagulation decolorization tank 6 is connected to the inclined plate sedimentation tank 7 , and the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 are connected to the mud storage tank 5 . A bypass is also provided between the inclined plate sedimentation tank 7 and the coagulation decolorization tank 6 to connect with the third return pump 11 . The detection ends of the pH online monitor 14 are respectively set in the anoxic pool 3 and the aerobic pool 4 , and the detection ends of the DO online monitor 15 are respectively set in the anoxic pool 3 and the aerobic pool 4 .

Specifically, the vertical flow sedimentation tank 8 can separate the mixed liquid from mud and water, and the supernatant is transported to the coagulation decolorization tank 6 through the overflow tank or corresponding pipelines, and the sludge is deposited at the bottom of the vertical flow sedimentation tank 8 . The first backflow pump 9 can pump the mixed solution in the aerobic tank 4 back to the anoxic tank 3; the second backflow pump 10 can pump the sludge at the bottom of the vertical flow sedimentation tank 8 back to the anoxic tank 3, aerobic Pool 4, so as to realize the circulation treatment of mixed liquid and sludge, and ensure the removal rate of high-concentration organic matter, SS, ammonia nitrogen, total nitrogen, chroma, etc. In addition, the wastewater treated by the coagulation and decolorization tank 6 is sent to the inclined plate sedimentation tank 7 through corresponding pumps and pipelines, and the inclined plate sedimentation tank 7 performs mud-water separation on it; the supernatant after the separation is passed through the overflow tank The sludge at the bottom of the pool is pumped back to the coagulation and decolorization tank 6 through the third return pump to reduce the usage of coagulants and decolorizers. Finally, the residual sludge in the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 is pumped into the mud storage tank 5 through the sewage pump 31 .

Further, the bottoms of the regulating tank 1 , the anoxic tank 3 and the aerobic tank 4 are all provided with an aeration device, and the aeration device includes a membrane-type microporous aeration disc 16 . The size of the aeration discs 16 is Φ215mm, the installation distance is 500mm, the installation height from the surface to the bottom of the pool is 200-270mm, and the service area is 0.25-0.55m2/piece. The aeration discs 16 are connected to the fan 17. It should be understood that the pH and DO in the anoxic pool 3 and the aerobic pool 4 can be monitored in real time by the pH online monitor 14 and the DO online monitor 15, thereby ensuring that the dissolved oxygen in the oxygen pool 3 is controlled at 0.5-1.0mg/ L, the dissolved oxygen in the aerobic pool 4 is controlled at 2-4mg/L, and the reflux ratio of the mixed solution is set at 100%-400%; thereby realizing short-range nitrification-denitrification, improving total nitrogen removal efficiency and reducing treatment costs. Furthermore, when the concentration of ammonia nitrogen in the treated sewage is high, the carbon-to-nitrogen ratio of the wastewater can be adjusted by controlling the gas valve in the regulating tank to increase the distribution of gas in the regulating tank and cooperate with the addition of lye to carry out ammonia stripping.

Further, fillers are installed in the anoxic pool 3 and the aerobic pool 4, and the fillers are combined fillers or suspended fillers. The design spacing of the combined packing is 150-200mm, the material is PP+formaldehyde silk, and the specification is Φ150×100mm (80). The combined packing is installed on the non-fixed packing frame 32. The height design dimension of the packing frame 32 is that the upper part is 100mm lower than the water surface of the pool body, the bottom is 300-400mm higher than the bottom of the pool body, and the distance between the four sides and the pool body is 50-100mm. To facilitate the disassembly of the packing frame 32 and the combined packing. In addition, the volume of suspended filler is 5-8% of the volume of the pool body to ensure the effect of wastewater treatment.

Further, a stirring device is installed in the coagulation decolorization tank 6, and the stirring device includes a mechanical stirring device and an aeration stirring device. Wherein, the mechanical stirring device is a motor shaft with stirring blades, and the aeration stirring device is an aeration disc 16 arranged at the bottom of the coagulation decolorization tank 6, and the aeration disc 16 is connected with a fan 17. That is to say, the coagulation decolorization tank 6 stirs the sewage in the tank by means of mechanical stirring and aeration stirring; thereby improving the removal efficiency of refractory organic matter, total phosphorus and chroma.

Further, the control cabinet 12 is constituted by a PLC system, which is used to control various electrical equipment, and is divided into manual and automatic modes, and the running time can be set. Furthermore, the valves for controlling the air volume and water volume of each part are all arranged in easy-to-operate positions.

In addition, according to the different water quality of livestock and poultry breeding wastewater, the wastewater treatment process can be adjusted and transformed. When it is detected that the concentration of ammonia nitrogen in the influent is high and the carbon-nitrogen ratio is out of balance, the blower 13 and the dosing device 13 can be turned on to adjust the pH of the wastewater to alkaline (about pH 11), and the ammonia nitrogen in the wastewater is blown off to achieve adjustment The effect of wastewater carbon to nitrogen ratio, its treatment process is shown in Figure 6a. When it is detected that the influent contains high SS, switch the pipeline and the corresponding valve, and put the coagulation and decolorization pool 6 in front, that is to say, after the wastewater is regulated by the mediation pool 1, it will first enter the coagulation and decolorization pool 6, and then open The dosing device 13 is used to remove part of the solid SS, total phosphorus and chroma; finally, the waste water enters the anoxic pool 3 and the aerobic pool 4 for further treatment, and the treatment process is shown in Figure 6b. At the same time, the fillers in the anoxic pool 3 and the aerobic pool 4 can also be replaced according to the actual wastewater treatment conditions, and the biochemical treatment unit can be transformed into conventional activated sludge process (without filler), biological contact oxidation process (combined filler), IFAS A biochemical treatment unit in the process (combined packing) and MBBR process (suspended packing) to meet the treatment requirements of different water quality.

The effluent conditions of livestock and poultry breeding wastewater treated by the device will be further explained below in conjunction with specific examples.

Example 1

Steps:

1. Test the water quality of the influent.

2. Turn on the power supply, turn on the main switch, turn on the water inlet pump 30, draw waste water through the water inlet 33, and adjust the water inlet volume. After adjusting the flow rate, turn on the gas volume valve and fan 17 of the adjustment tank 1, and agitate through aeration. Then, turn on the acid/alkali dosing switch, adjust the chemical concentration and the flow rate of the corresponding metering pump, and add acid/alkali to the adjustment tank 1; complete the pretreatment of the influent.

3. Open the corresponding pump valve, so that the mixed solution enters the anoxic pool 3 and the aerobic pool 4 in turn from the regulating pool 1; open the corresponding valves of the anoxic pool 3 and the aerobic pool 4, and adjust and control the aeration according to the flow rate of the wastewater ; Turn on the first return pump 9 and the second return pump 10, and determine the return flow of the mixed liquor and sludge according to the water quality requirements. Add a certain amount of nitrifying bacteria agent to the aerobic pool 4, and at the same time, dynamically detect and adjust the pH value and DO concentration in the anoxic pool 3 and the aerobic pool 4 through the pH online monitor 14 and DO online monitor 15 to control the biochemical During the treatment process, short-range nitrification-denitrification occurs, and anoxic and aerobic biochemical treatments are completed.

4. After the mud-water mixture in the aerobic pool 4 is separated from the mud-water by the vertical flow sedimentation tank 8, part of the sludge is returned to the anoxic pool 3 and the aerobic pool 4 through the second return pump 10, and the supernatant flows through the overflow tank to Coagulation and decolorization pool6.

5. Turn on the stirring device in the coagulation and decolorization tank 6; at the same time, turn on the dosing device 13, and add coagulant and decolorant to the coagulation and decolorization tank 6.

6. The waste water treated by the coagulation and decolorization tank 6 enters the inclined plate sedimentation tank 7 for mud-water separation, and the supernatant is discharged through the overflow tank; the third reflux pump 11 is turned on to adjust the flow rate on the reflux pipeline, and part of the materialized sludge is refluxed To the coagulation and decolorization pool 6, to reduce the usage of coagulant and decolorization agent.

7. The remaining sludge in the vertical flow sedimentation tank 8 and the inclined plate sedimentation tank 7 is discharged to the mud storage tank 5 through the sewage pump 31 .

Specifically, under the condition that the influent carbon and nitrogen are relatively suitable (COD:TN≈10:1), there is no filler in the biochemical treatment unit, that is, the traditional activated sludge process is adopted, and the process flow is shown in Figure 6a. Simultaneously control the DO concentration in the anoxic pool 3 to be 0.5 mg/L, the DO concentration in the aerobic pool 4 to be 2.0-3.5 mg/L, and the pH to be 7.8-8.6; the reflux ratio of the mixed solution is 200%; hydraulic retention The time (HRT) is set to 5d, and the sludge retention time (SRT) is set to 7d; the temperature range is 25°C-28°C; The addition amount of coagulant and decolorizer is 200mg/L and 150mg/L respectively. The implementation effect is shown in Table 1.

Table 1

Example 2:

In this embodiment, the influent SS content is high, and the coagulation decolorization tank 6 and the inclined plate sedimentation tank 7 are placed in front, that is, the operation steps 5 and 6 in the embodiment 1 are replaced before the step 3, and the rest remain unchanged; in addition , the influent COD is high, and the biochemical treatment unit adopts combined packing, that is, adopts the IFAS process, and its process flow is shown in Figure 6b. Simultaneously control the DO concentration in the anoxic pool 3 to be 0.5-0.8 mg/L, the DO concentration in the aerobic pool 4 to be 2.2-3.8 mg/L, and the pH to be 7.2-8.2; the reflux ratio of the mixed solution is set to 250% ; The hydraulic retention time (HRT) is set to 5d, and the sludge retention time (SRT) is set to 7d; the temperature range is 25°C-30°C; Adding amount of agent and decolorizing agent are 300mg/L and 200mg/L respectively. The implementation effect is shown in Table 2.

Table 2

Example 3:

In this embodiment, the carbon-to-nitrogen ratio of the influent is about 5:1, which is waste water with a low carbon-to-nitrogen ratio. The pH is adjusted to about 11 by adding lye to the adjustment tank, that is, on the basis of Example 1, step 2 The water quality is adjusted to a pH of about 11, thereby adjusting the carbon-nitrogen ratio of the influent; the biochemical treatment unit uses a combined filler, and the rest of the steps remain unchanged, that is, the contact oxidation process is used, and the process flow is shown in Figure 6a. Simultaneously control the DO concentration control in the anoxic pool 3 to be 0.5-0.8mg/L, the DO concentration control in the aerobic pool is 2.6-3.8mg/L, and the pH range is 7.6-8.3; the mixed solution reflux ratio is set to 200%; hydraulic retention time HRT=5d, SRT=7d; temperature range is 25°C-30°C; the addition amount of nitrifying bacteria agent is 2-5% (w/v); the addition amount of coagulant and decolorizing agent is respectively 300mg/L, 150mg/L. The implementation effect is shown in Table 3.

table 3

Example 4:

In this embodiment, the temperature range of the wastewater is 15°C-19°C, and the lower temperature has a certain inhibitory effect on the activity of microorganisms. On the basis of Example 1, the biochemical treatment unit adopts (suspended filler), and the remaining steps remain unchanged, that is, the MBBR process is used to reduce the impact of low temperature on microbial activity. The process flow is shown in Figure 6a. Simultaneously, the DO concentration in the anoxic pool 3 is controlled to be 0.5-1.0 mg/L, the DO concentration in the aerobic pool is controlled to be 3.0-4.0 mg/L, and the pH is 7.8-8.2; the reflux ratio of the mixed solution is set to 300%; HRT=8d, SRT=10d; the addition amount of nitrifying bacteria agent is 2-5% (w/v); the addition amount of coagulant, decolorizing agent is respectively 250mg/L, 150mg/L. The implementation effect is shown in Table 4.

Table 4

It should be pointed out that the inventors did not only conduct experiments on the above-mentioned parameters, but the above-mentioned sets of parameters and results are more representative, and for the sake of space, the above-mentioned embodiments were selected for comparison. The unit of each data is mg/L. According to Tables 1 to 4, it can be seen that the effluent quality of the livestock wastewater treated by the treatment method of the present invention is: COD≤246mg/L, SS≤85mg/L, ammonia nitrogen≤12.1mg/L, total nitrogen≤65.7mg/L L, total phosphorus ≤ 3.3mg/L, except for COD, other indicators have reached the standards of "Discharge Standards of Pollutants for Livestock and Poultry Breeding Industry" (Second Draft for Soliciting Comments).

The above-mentioned embodiments only further describe the purpose, technical solutions and advantages of the present invention in further detail. It should be understood that the present invention is not limited to the scope of specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected. List.

Claims (9)

1. a kind of livestock breeding wastewater, biogas slurry integral treatment method, step include:

S1, the water quality for detecting waste water；

S2, stirring, according to waste water quality pretreated waste water；

S3, anoxic, Aerobic Process for Treatment are successively carried out, wherein Aerobic is added with nitrification microbial inoculum, and controls in treatment process Dissolved oxygen content, pH and return current ratio of the mixed liquid；

S4, precipitating, mud-water separation；

S5, by the separating obtained supernatant of step S4, be stirred, coagulation decoloration processing；

Treated that waste water precipitated, mud-water separation for S6, coagulation decoloration；

S7, precipitating gained sludge is drained into storage basin.

2. livestock breeding wastewater integral treatment method according to claim 1, it is characterised in that: as SS higher in waste water When, step S5, S6 is exchanged to before step S3.

3. livestock breeding wastewater integral treatment method according to claim 1 or 2, it is characterised in that: Aerobic Process for Treatment mistake The nitrification microbial inoculum mass volume ratio of addition in journey is 2-5%.

4. livestock breeding wastewater integral treatment method according to claim 3, it is characterised in that: part is heavy through perpendicular stream The resulting sludge that forms sediment sends anoxic, Aerobic Process for Treatment back to.

5. livestock breeding wastewater integral treatment method according to claim 4, it is characterised in that: by part coagulation decoloration Resulting sludge is precipitated after processing sends coagulation decoloration processing back to.

6. livestock breeding wastewater integral treatment method according to claim 5, it is characterised in that: the anoxic, aerobic Used filler is one kind of composite filling or floating stuffing in the process；The composite filling design spacing is 150-200mm, Material is PP+ hydroformylation silk；The floating stuffing dosage is the 5-8% of anoxic, tank volume used in Aerobic.

7. livestock breeding wastewater integral treatment method according to claim 6, it is characterised in that: the anoxic treatment mistake Dissolved oxygen of the dissolved oxygen control in 0.5-1.0mg/L, aerobic process is controlled in 2-4mg/L in journey；Return current ratio of the mixed liquid is 100%-400%.

8. livestock breeding wastewater integral treatment method according to claim 7, it is characterised in that: detected according to step S1 Obtain data, filler used in adjustment anoxic, Aerobic.

9. the device of livestock breeding wastewater integral treatment method described in -8 any one claims according to claim 1, It is characterized by comprising conditioning tank (1), equipment room (2), anoxic pond (3), aerobic tank (4), vertical sedimentation tank (8) coagulation decolorations Pond (6), inclined-plate clarifying basin (7)；

Be provided in the equipment room (2) chemicals dosing plant (13), blower (17), the first reflux pump (9), the second reflux pump (10), Third reflux pump (11), two pH on-line computing models (14), two DO on-line computing models (15) and control cabinet (12)；The blower (17), the first reflux pump (9), the second reflux pump (10), third reflux pump (11), chemicals dosing plant (13), pH on-line computing model (14), DO on-line computing model (15) respectively with control cabinet (12) be electrically connected, the chemicals dosing plant (13) respectively with conditioning tank (1), coagulation decoloration pond (6) are connected；

Conditioning tank (1) discharge outlet is successively connect with anoxic pond (3), aerobic tank (4), the anoxic pond (3), aerobic tank (4) Between setting bypass be connected with the first reflux pump (9), the aerobic tank (4) is connected with vertical sedimentation tank (8), and the perpendicular stream precipitates Pond (8) is connected with anoxic pond (3), aerobic tank (4) respectively by the second reflux pump (10), the vertical sedimentation tank (8) and coagulation Decolouring pond (6) is connected, and the coagulation decoloration pond (6) is connected with inclined-plate clarifying basin (7), the vertical sedimentation tank (8), sloping plate deposition Pond (7) is connected with storage basin (5), and the connection between each pond body is to be detachably connected；

Bypass is additionally provided between the inclined-plate clarifying basin (7) and coagulation decoloration pond (6) to be connected with third reflux pump (11), it is described The test side of pH on-line computing model (14) is separately positioned in anoxic pond (3), aerobic tank (4), the DO on-line computing model (15) Test side be separately positioned in anoxic pond (3), aerobic tank (4).