CN205528299U - Effluent disposal system of diary farm - Google Patents

Abstract

The utility model discloses a dairy farm wastewater treatment system, which belongs to the technical field of environmental engineering. The system of the utility model is sequentially provided with: a regulating tank, a filter press device, a first anaerobic tank, a second anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, an aerated biological fluidized bed, an air flotation tank, Sludge storage tank. The sewage treatment system based on "anaerobic treatment + AAO + aerated biological fluidized bed + air flotation tank" of the utility model has good treatment effect, low energy consumption, anaerobic biogas can also be used as energy, and the remaining sludge after treatment The amount is small, which reduces the cost of excess sludge treatment; and the project investment is small, the operating cost is low, and the operation and management are simple and convenient.

Description

A dairy farm wastewater treatment system

technical field

The utility model relates to a dairy farm wastewater treatment system, which belongs to the technical field of environmental engineering.

Background technique

With the improvement of people's living standards and the increase in the demand for dairy products, the amount of milk produced by the scattered dairy cows previously raised by residents can no longer meet people's requirements, so large-scale farming is increasing day by day. While large-scale farming brings huge social benefits, the harm it brings to the environment cannot be underestimated. The problem of environmental pollution has gradually attracted people's attention, so seeking an efficient and low-cost treatment method has become a key research direction.

Dairy farm wastewater is mainly composed of urine, flushing water (including manure flushing water for pens, drinking trough flushing water, ground cleaning water, equipment and facility cleaning water, etc.), and a small amount of wastewater generated in the daily life and production of workers. Dairy industry wastewater mainly has the following characteristics: high organic matter, nitrogen and phosphorus content, large water volume and low temperature. The uniqueness of dairy industry wastewater increases the difficulty of treatment, and it is difficult to meet the standard treatment with existing treatment methods.

At present, the treatment methods of dairy farm wastewater mainly include anaerobic treatment method, aerobic treatment method and anaerobic-aerobic combined treatment method. Although the anaerobic treatment method can treat high-concentration dairy farm wastewater, the concentration of the effluent after anaerobic treatment is still high, which cannot meet the discharge standards, and is accompanied by odor, which affects the surrounding environment. Due to the characteristics of dairy farm wastewater with high organic matter and high nitrogen and phosphorus, the aerobic treatment technology is mainly aimed at wastewater with a COD lower than 500 mg/L. Therefore, the aerobic treatment method must be diluted before treating dairy farm wastewater, which requires a large amount of water and increases The processing capacity is increased, and the processing cost is increased at the same time. At present, the most widely used method is the anaerobic-aerobic combined treatment method, but the treatment effect of this method on dairy farm wastewater is not good for nitrogen and phosphorus. The main reason is that most of the organic matter is consumed in the anaerobic stage, which affects denitrification. Effect.

Utility model content

In order to solve the above problems, the utility model provides a dairy farm wastewater treatment system based on "anaerobic-AAO-aeration fluidized bed" treatment, which solves the difficulty of existing dairy farm wastewater treatment, poor treatment effect, nitrogen and phosphorus The content of the water is not up to the standard and other problems.

The utility model provides a wastewater treatment system for dairy farms. The system is sequentially provided with: a regulating tank, a filter press device, a first anaerobic tank, a second anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, Aerated biological fluidized bed, air flotation tank, sludge storage tank.

In one embodiment of the present utility model, an aeration device is provided in the regulating tank.

In one embodiment of the present utility model, the adjustment pool is connected to a filter press through a feed pump.

In one embodiment of the present utility model, the filter press is an automatic compartment diaphragm filter press.

In one embodiment of the present utility model, the filter chamber area of the automatic compartment diaphragm filter press is 200m ² , and the volume of the filter chamber is 4m ³

In one embodiment of the present utility model, the first anaerobic tank is a UASB reactor, the upper part of the reactor is provided with a three-phase separator, the top is provided with a gas collection pipeline, and the lower part is provided with a sludge discharge device, and in the reactor There is an internal return pipe inside.

In one embodiment of the present utility model, the aerobic pool and the anoxic pool are connected through a sludge return system.

In one embodiment of the present utility model, the sedimentation tank is connected with the second anaerobic tank through a sludge return device.

In one embodiment of the present utility model, the sedimentation tank is a vertical sedimentation tank with a sludge discharge system.

In one embodiment of the present utility model, an anoxic device is further arranged in front of the biological aerated fluidized bed.

In one embodiment of the present utility model, the air flotation tank is provided with a feeding device.

In one embodiment of the present invention, the feeding device is filled with PAM and PAC.

The working principle of the utility model is as follows:

(1) Dairy farm wastewater enters the regulating tank; (2) The conditioned wastewater enters the filter press for dehydration, removes suspended matter, and the mud cake is discharged; (3) The filtrate enters the first anaerobic pool to treat the organic matter in the wastewater Carry out microbial degradation; (4) the effluent of the first anaerobic tank and the return sludge of the sedimentation tank enter the second anaerobic tank together, and in the second anaerobic tank, the phosphorus-accumulating bacteria release phosphorus and part of the nitrogen-containing organic matter is ammonified; ( 5) The effluent of the second anaerobic tank and the internal circulation wastewater of the aerobic tank enter the anoxic tank together, and the nitrate nitrogen is denitrified in the anoxic tank; (6) The effluent of the anoxic tank enters the aerobic tank to complete the nitrification of ammonia nitrogen and phosphorus absorption, remove the remaining organic matter, set up an independent reflux system in the aerobic tank, and return it to the anoxic tank; (7) the effluent from the aerobic tank enters the sedimentation tank, and part of the phosphorus-containing sludge returns to the second anaerobic tank, and the sedimentation tank is set There is a sludge discharge system; (8) The supernatant of the sedimentation tank is passed into the aerated biological fluidized bed, and the residual organic pollutants, nitrogen, and phosphorus in the wastewater are further removed; (9) The wastewater is lifted into the air flotation tank, and the separated sewage The mud is discharged into the sludge storage tank, the effluent is discharged up to the standard, and the air flotation tank is equipped with a feeding device.

The beneficial effects of the utility model:

(1) This utility model is aimed at the characteristics of high organic content and ammonia nitrogen content in dairy farm wastewater. Firstly, a box-type diaphragm filter press is used to remove SS in wastewater to reduce the difficulty of subsequent biological treatment. Anaerobic technology can remove most of the organic matter, but Unable to meet the discharge standards, and the removal rate of nitrogen and phosphorus is low. After anaerobic treatment, it enters the AAO process. The main purpose is to remove nitrogen and phosphorus. After AAO treatment, the content of total nitrogen has been greatly reduced, but the content of phosphorus is still not up to the standard; so the effluent It is further passed into the air flotation tank, and PAM and PAC are added before the air flotation to further reduce the phosphorus content.

(2) The wastewater treatment system based on "anaerobic treatment + AAO + aerated biological fluidized bed + air flotation tank" of the utility model has good treatment effect, low energy consumption, anaerobic biogas can also be used as energy, and the remaining sewage of this method The amount of mud is small, which reduces the cost of excess sludge treatment; and the project investment is small, the operating cost is low, and the operation and management are simple and convenient.

Description of drawings

Fig. 1: Working diagram of the dairy farm wastewater treatment system of the present invention.

detailed description

The dairy cow wastewater produced by Jinshan Breeding Dairy Farm of Shanghai Guangming Holstein Animal Husbandry Co., Ltd. was taken as the research object. The wastewater from the company's dairy farm is characterized by high organic matter, NH ₃ -N, high TP and high solid content.

Example 1: Dairy Farm Wastewater Treatment System

The dairy farm wastewater treatment system of the present utility model is provided with: regulating tank, press filter device, first anaerobic tank, second anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, aerated biological fluidized bed , Air flotation tank, sludge storage tank.

Wherein, the regulating tank is provided with an aeration device, and the perforated pipe is used for intermittent aeration and stirring in the tank to achieve uniform water quality and prevent solid particles from settling; the upper part of the reactor of the first anaerobic tank is provided with a three-phase separator, The top is provided with a gas collection pipe, the lower part is provided with a sludge discharge device, and an internal return pipe is provided inside the reactor; the filter press is an automatic compartment diaphragm filter press; the aerobic pool and the anoxic pool pass through the sewage The sludge return system is connected; the sedimentation tank is connected to the second anaerobic tank through a sludge return device; the sedimentation tank is a vertical sedimentation tank with a sludge discharge system; the air flotation tank is provided with a feeding device.

The pretreated dairy farm wastewater in the adjustment tank enters the filter press for dehydration through the feed pump, and the suspended solids are intercepted after the press filtration, the suspended solids and COD content in the effluent water are greatly reduced, and the mud cake is discharged; after the press filtration, the filtrate is pumped into The first anaerobic tank decomposes organic matter in wastewater through the metabolism of anaerobic microorganisms. In the first anaerobic tank, most of the content of COD, BOD, and SS are removed, but the removal rate of NH ₄ ⁺ -N, TN, and TP However, it is not large; the anaerobic effluent further passes through the second anaerobic pool, anoxic pool, and aerobic pool, and then enters the AAO process (anaerobic-aerobic replacement, anoxic-aerobic replacement) to remove total phosphorus and nitrify Bacteria carry out nitrification reaction under aerobic mediation, and denitrifying bacteria denitrify under anoxic conditions; the wastewater after AAO process enters the sedimentation tank for mud-water separation, and part of the sludge returns to the anoxic tank; Aerobic treatment is carried out on the aerobiological fluidized bed, and a small anoxic area is set in front of the fluidized bed. While removing COD, it can also continue to degrade total nitrogen. After that, the wastewater is passed into the air flotation tank. Before the air flotation, PAC and PAM are added to continue to purify the phosphorus content in the wastewater. At the same time, the activated sludge that has not been separated in the water is also separated by air flotation.

Example 2: Dairy Farm Wastewater Treatment System

The dairy farm wastewater treatment system of the present utility model is provided with: regulating tank, press filter device, first anaerobic tank, second anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, aerated biological fluidized bed , Air flotation tank, sludge storage tank.

The waste water enters the regulating tank through the lift pump. The regulating pool adopts reinforced concrete structure.

The waste water enters the automatic compartment diaphragm filter press through the filter feed screw pump. The model of the filter press is XMZG200/1250, the filter area is 200m ² , and the volume of the filter chamber is 4m ³ .

The first anaerobic tank, design parameters: L×W×H=12.5m×8.5m×12m, quantity 2. The internal circulation system (water pump) is installed in the first anaerobic tank. The pump model is 150WL150-7-5.5, the quantity is 2, and the internal circulation device is 4 sets. The material is SS304+UPVC. The first anaerobic tank adopts bottom feeding, 4 water distribution pipes are evenly distributed, and the material is SS304+UPVC. The upper part of the reactor is equipped with 8 sets of three-phase separators, the material is FRP, the top is equipped with gas collection pipes, and the lower part is equipped with drainage. The mud device has 4 sets of outlet weirs, the material is SS304, and there is an internal return pipe inside the reactor.

The AAO reactor includes the second anaerobic tank, anoxic tank, aerobic tank and sedimentation tank. The AAO reactor is a reinforced concrete structure, the quantity is 2, the design parameters: L×W×H=, 16m×12.5m×6m, the effective water depth is 5.5m, the total effective volume is 2200m ³ , and there are 1000 sets of aerators in the AAO reactor , the material is ABS, and a submersible mixing device is set inside.

The aerobic tank is filled with 2000m3 biological carrier elastic material, the material ^of the biological carrier support is hot-dip galvanized, 4 sets of internal circulation return pumps (2 for use and 2 for standby), model 100WL80-10-4, the pump body is made of cast iron; 3 sets of Roots fans (2 for 1 spare), model SSR150HB; 2 submersible mixers, material SS304, model MA2.2/8-320-740.

The sedimentation tank is a reinforced concrete structure, design parameters: L×W×H=7.5m×7.5m×4m, a mud scraper is installed in the sedimentation tank, the underwater material is SS304, the water material is CS anti-corrosion, and the outlet weir is made of SS304. There are two sludge return pumps in the sedimentation tank (one for use and one for standby), the model is 65WL30-10-2.2, and the pump body is made of cast iron.

The aerated biological fluidized bed is a reinforced concrete structure, the design parameters: L×W×H=10m×7.5m×5m, the effective volume is 375m ³ , PE+polyurethane filler is added to the aerated biological fluidized bed, and the specific surface area of the filler is 500-3.5 ×103m ² /m ³ , the material of the aeration system is UPVC, and the material of the distribution system is SS304.

The waste water flows out from the aerated biological fluidized bed through a lift pump (model 65WQ30-15-3) to pump into the floating tank, and the model of the air floating tank is DAF-45. The air flotation tank is equipped with a set of PAC storage tank (single tank volume 30m ³ , material PE), a set of PAM automatic drug making machine (material SS304, model PT2660), 2 sets of PAM dosing metering pump (model JZM-A1200), 2 sets PAC dosing metering pump (model JZM-A1200).

Example 3 Dairy Farm Wastewater Treatment

The sewage treatment system of the utility model is used to treat the waste water from the Jinshan Dairy Farm of Shanghai Guangming Holstein Animal Husbandry Co., Ltd. Dairy farm wastewater COD is about 48600mg/L, BOD is about 7800mg/L, NH ₄ ⁺ -N is about 1230mg/L, TN is about 1543mg/L, TP is about 447mg/L, after the wastewater treatment system of the utility model COD<400mg/L, the average removal rate of effluent after treatment is 99%; BOD<150mg/L, the average removal rate is 99%; NH ₄ ⁺ -N<40mg/L, the average removal rate is 99%; TN<60mg /L, the average removal rate is 99%; TP<8mg/L, the average removal rate is 99%; SS<400mg/L, TP<8mg/L, fully meet the "Livestock and Poultry Farming Pollutant Discharge Standard" (GB18596- 2001) emission standards required.

Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person familiar with this technology can make various changes and modifications without departing from the spirit and scope of the utility model. modification, so the scope of protection of the utility model should be defined by the claims.

Claims (10)

1. A dairy farm wastewater treatment system, characterized in that, the system is provided with: regulating tank, press filter device, the first anaerobic tank, the second anaerobic tank, anoxic tank, aerobic tank, sedimentation tank , Aerated biological fluidized bed, air flotation tank, sludge storage tank. 2. The dairy farm wastewater treatment system according to claim 1, wherein the first anaerobic tank is a UASB reactor, the upper part of the reactor is provided with a three-phase separator, the top is provided with a gas collection pipe, and the lower part is provided with Sludge discharge device, and an internal return pipeline is provided inside the reactor. 3. The dairy farm wastewater treatment system according to claim 1, characterized in that, an aeration device is provided in the regulating tank. 4. The dairy farm wastewater treatment system according to claim 1, wherein the aerobic pool is connected to the anoxic pool through a sludge return system. 5. The dairy farm wastewater treatment system according to claim 1, characterized in that, the sedimentation tank is connected to the second anaerobic tank through a sludge return device. 6. The dairy farm wastewater treatment system according to claim 1, characterized in that an anoxic device is provided in front of the biological aerated fluidized bed. 7. The dairy farm wastewater treatment system according to claim 1, wherein the sedimentation tank is a vertical sedimentation tank and is provided with a sludge discharge system. 8. The dairy farm wastewater treatment system according to claim 1, wherein the adjustment tank is connected to a filter press through a feed pump. 9. The dairy farm wastewater treatment system according to claim 1, wherein the filter press is an automatic compartment diaphragm filter press. 10. The dairy farm wastewater treatment system according to claim 1, characterized in that, the air flotation tank is provided with a feeding device.