CN212198940U - Breed sewage treatment system based on multi-media soil filtration technique - Google Patents

Abstract

The utility model discloses a culture sewage treatment system based on multi-medium soil infiltration technology, which comprises a sedimentation filter tank, an aerobic tank, an anaerobic tank and a dephosphorization tank which are connected in sequence, wherein biological filler is arranged in the aerobic tank, an aeration pipe is arranged below the biological filler and is connected with an aeration pump, the sedimentation filter tank is connected with the aerobic tank through a water pipe I, and a water pump I is arranged on the water pipe I; be equipped with zeolite water passing layer in the anaerobism pond, be equipped with the multimedium soil horizon in zeolite water passing layer, be equipped with the seal membrane at the top in anaerobism pond, good oxygen pond leads to pipe II and is connected with the anaerobism pond, is equipped with suction pump II on water pipe II, and dephosphorization pond leads to pipe III and is connected with the anaerobism pond, is equipped with suction pump III on water pipe III. The utility model separately arranges the nitrification and denitrification reactions in the aerobic tank and the anaerobic tank, thereby avoiding the mutual restriction between the aerobic tank and the anaerobic tank and having better denitrification effect; can realize the closed-loop treatment and the recycling of the aquaculture sewage and realize the near zero emission of the aquaculture sewage.

Description

Breed sewage treatment system based on multi-media soil filtration technique

Technical Field

The utility model relates to a sewage treatment engineering especially relates to a breed sewage treatment system based on multimedium soil filtration technique.

Background

The aquaculture mode of China develops from the traditional low-density and extensive aquaculture mode to intensive and industrial aquaculture with high density, high investment and high output, and the development of aquaculture technology makes great progress. In the culture process, in order to increase the yield of aquatic products, a large amount of artificial baits, residual baits which are not ingested, excrement of culture objects and the like are put into the culture water body and become main sources of pollutants of the culture water body. On the other hand, in order to prevent and control diseases, remove harmful organisms and ensure the healthy and stable environment of the aquaculture water, the aquaculture personnel need to often use chemical agents such as insecticides, algicides, weeding and stopping agents and the like to remove the harmful organisms in the aquaculture water, and residual pesticides enter the aquaculture water and become another source of pollutants in the aquaculture water.

The aquaculture sewage is usually discharged into a natural water body without being treated or primarily treated, so that a large amount of water resources are wasted, and pollutants generated in the aquaculture process are brought into the surrounding environment, so that the pollution of the surrounding water body is caused, and the ecological balance of a water area is damaged. Therefore, how to treat the aquaculture sewage in a closed loop, realizing the near zero emission of the aquaculture sewage and reducing the aquaculture pollution becomes a problem to be solved.

Patent application No.: 201810727501.8 discloses a seawater pond circulating water aquaculture system, which comprises a seawater pump station, a seawater sedimentation tank pump station, a water diversion tank, a biological purification system, a water supply channel, an aquaculture tank, and a water return channel. The biological purification system of the seawater pond recirculating aquaculture system consists of a primary biological purification tank, a secondary biological purification tank and a tertiary biological purification tank. The primary biological purification tank adopts a soil tank structure, has the main functions of suspending biological fillers and removing harmful substances in water by using an active biological film growing on the surface of the biological fillers, but fails to effectively exert the purification effect of a soil layer at the bottom of the tank, has small contact area with sewage, cannot form an anaerobic environment by using the soil layer, has weaker denitrification effect and weaker TN removal effect. The second-level and third-level biological purification tanks utilize the chuanwan algae to remove harmful substances in water, but the chuanwan algae needs proper temperature for growth and reproduction, and the chuanwan algae is not beneficial to growth when the temperature is lower in winter, so the purification effect of the second-level and third-level biological purification tanks is greatly influenced by seasons.

Patent application No.: 201610033461.8 discloses a method for treating circulating water of seawater for aquaculture and a device thereof, which comprises a purifying box, an electrocatalytic oxidation device, a purifying tank, an aeration tank and a multistage fine filter. The method and the equipment for treating the circulating water of the seawater for cultivation decompose organic matters by using the electro-catalytic oxidation device, so that the energy consumption is high, and the economical efficiency is relatively poor; after the aquaculture sewage is oxygenated by the aeration tank, the aquaculture sewage enters the multistage fine filter tank, an obvious aerobic environment can be formed, the nitrification reaction is facilitated, the nitrate nitrogen concentration of the effluent is increased, and the problems that the denitrification effect is not synchronously enhanced and the denitrification effect is weak are caused by the fact that the dissolved oxygen concentration is too high and no obvious anaerobic environment exists.

Patent application No.: 201810250868.5 discloses a dual automatic oxygen-making and reoxygenation multi-medium soil layer underground sewage treatment system, which comprises a medicine inlet device, a water distribution pipe, a surface soil covering layer, a gravel layer, an oxygen-making and reoxygenation multi-medium soil layer, a gravel layer, a water outlet layer and an impermeable layer, wherein the surface soil covering layer, the gravel layer, the oxygen-making and reoxygenation multi-medium soil layer, the gravel layer, the water outlet. The system is provided with a two-layer water distribution mode, so that the whole system is uniformly distributed with uniform oxygen distribution, and the utilization efficiency of the system is improved. The system has the advantages that the aerobic environment of the gravel layer and the anaerobic environment of the soil layer are arranged in the same device, the aerobic environment and the anaerobic environment are mutually restricted, and the nitrification reaction and the denitrification reaction are difficult to balance.

Patent application No.: 201410322638.7 discloses a vertical flow biotrickling filter-horizontal flow multi-medium soil infiltration sewage treatment system, which comprises a front section vertical flow biotrickling filter system and a rear section horizontal flow multi-medium soil infiltration system under the front section. The system adopts horizontal flow, so that the hydraulic retention time is effectively prolonged, the horizontal flow submerges the effluent, and the anaerobic environment is improved; however, as in patent 201810250868.5, the aerobic environment of the natural zeolite packing layer and the anaerobic environment of the sealed soil layer are arranged in the same device, and the mutual restriction between the aerobic environment nitration reaction and the anaerobic environment denitrification reaction exists.

Patent application No.: 201520717439.6 discloses a multi-medium baffling biological aerated filter, which comprises a two-stage biological aerated filter and water through holes, wherein the two-stage biological aerated filter is communicated with the water through holes on the lower side, and the two-stage biological aerated filter is provided with a packing layer. The two-stage aeration biological filter of the system has aeration oxygenation, high dissolved oxygen concentration and obvious nitrification reaction in aerobic environment, and the denitrification reaction in anaerobic environment in the same device has weaker denitrification reaction, is not beneficial to the denitrification reaction and has weak denitrification effect.

Disclosure of Invention

The utility model provides a breed sewage treatment system based on multi-medium soil filtration technique for solve the technical problem that exists among the well-known technique, this system can avoid nitration reaction and denitrification reaction to restrict each other, and denitrification effect is good.

The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: a culture sewage treatment system based on a multi-medium soil infiltration technology comprises a precipitation filter tank, an aerobic tank, an anaerobic tank and a phosphorus removal tank which are sequentially connected, wherein the precipitation filter tank is divided into a front tank and a rear tank by a filter partition wall I, a supporting layer is arranged at the bottom of the aerobic tank, biological filler is arranged on the supporting layer, an aeration pipe is arranged below the biological filler and is connected with an aeration pump, the aeration pump is arranged outside the aerobic tank, the rear tank of the precipitation filter tank is connected with the top of the aerobic tank through a water pipe I, a water suction pump I is arranged on the water pipe I, a water outlet gravel layer is arranged at the bottom of the anaerobic tank, a sealing film is arranged at the top end of the anaerobic tank, a zeolite water through layer is arranged on the water outlet gravel layer, a multi-medium soil layer is arranged in the zeolite water through layer, and a water inlet gravel layer is arranged on the multi-medium soil layer, the gravel layer of intaking sets up the top in anaerobism pond the below of seal membrane, the bottom in good oxygen pond pass through water pipe II with the top in anaerobism pond is connected be equipped with suction pump II on the water pipe II, the dephosphorization pond adopts and filters II front and back two parts pond grooves of separating into of partition wall, the rear portion pond groove in dephosphorization pond pass through water pipe III with the bottom in anaerobism pond is connected be equipped with suction pump III on the water pipe III.

The filtering partition wall I and the filtering partition wall II are identical in structure and are provided with water through holes, and geotextile is attached to the wall surface on the upstream side.

The equivalent aperture of the geotextile is 0.07-0.2 mm.

The sedimentation filter tank, the aerobic tank, the anaerobic tank and the phosphorus removal tank are all of reinforced concrete structures.

The utility model has the advantages and positive effects that: the nitrification reaction and the denitrification reaction are separately arranged in the aerobic tank and the anaerobic tank, so that the mutual restriction of the aerobic tank and the anaerobic tank is avoided; under the action of stage aeration, firstly, a biological film on the biological filler of the aerobic tank is subjected to nitration reaction to convert organic ammonia nitrogen into nitrate and nitrite, and then, a multi-medium soil layer in the anaerobic tank is subjected to denitrification reaction to convert the nitrate and nitrite into nitrogen for release, so that the denitrification effect is better; and finally, the phosphorus is removed independently by adding a phosphorus removing agent into the phosphorus removing tank, so that the defect that the effect of separating the nitration reaction and the denitrification reaction for removing phosphorus is poor is overcome. The utility model discloses can realize the closed loop treatment and the recycling of breeding sewage, adopt the utility model discloses breed sewage after the processing can supply water to produce and breed and recycle, has realized the nearly zero release of breeding sewage.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-a sedimentation filter tank, 2-an aerobic tank, 3-an anaerobic tank, 4-a phosphorus removal tank, 5-a filter partition wall I, 6-a water pump I, 7-biological filler, 8-an aeration pump, 9-an aeration pipe, 10-a support layer, 11-a water pump II, 12-a sealing film, 13-a water inlet gravel layer, 14-a multi-medium soil layer, 15-a zeolite water passing layer, 16-a water outlet gravel layer, 17-a water pump III and 18-a filter partition wall II.

Detailed Description

For further understanding of the contents, features and effects of the present invention, the following embodiments are exemplified and will be described in detail with reference to the accompanying drawings:

referring to fig. 1, a cultivation sewage treatment system based on a multi-medium soil infiltration technology includes a sedimentation filter tank 1, an aerobic tank 2, an anaerobic tank 3 and a phosphorous removal tank 4 which are connected in sequence.

The sedimentation and filtration tank 1 is divided into a front tank and a rear tank by a filtration partition wall I5.

The bottom of the aerobic tank 2 is provided with a supporting layer 10, the supporting layer 10 is provided with biological fillers 7, an aeration pipe 9 is arranged below the biological fillers 7, the aeration pipe 9 is connected with an aeration pump 8, and the aeration pump 8 is arranged outside the aerobic tank 2.

The rear tank groove of the sedimentation and filtration tank 1 is connected with the top of the aerobic tank 2 through a water pipe I, and a water suction pump I6 is arranged on the water pipe I.

The bottom of the anaerobic tank 3 is provided with a water outlet gravel layer 16, the top end of the anaerobic tank 3 is provided with a sealing film 12, and the sealing film 12 can prevent oxygen in the atmosphere from being dissolved and can also prevent other impurities from falling into the anaerobic tank. Go out to be equipped with zeolite water passing layer 15 on the water gravel layer 16 be equipped with multi-media soil horizon 14 in the zeolite water passing layer 15 be equipped with into water gravel layer 13 on the multi-media soil horizon 14, it sets up to advance water gravel layer 13 the top of anaerobism pond 3 the below of seal membrane 12.

The bottom of the aerobic tank 2 is connected with the top of the anaerobic tank 3 through a water pipe II, and a water suction pump II 11 is arranged on the water pipe II.

The dephosphorization tank 4 has the same structure as the sedimentation filter tank 1 and is divided into a front tank and a rear tank by a filter partition wall II 18.

And a tank at the rear part of the dephosphorization tank 4 is connected with the bottom of the anaerobic tank 3 through a water pipe III, and a water suction pump III 17 is arranged on the water pipe III.

In this embodiment, the filtering partition wall i 5 and the filtering partition wall ii 18 have the same structure, are provided with water through holes, and are attached with geotextile on the upstream side wall surface. The equivalent aperture of the geotextile is 0.07-0.2 mm, and the sedimentation filter tank 1, the aerobic tank 2, the anaerobic tank 3 and the phosphorus removal tank 4 are all of reinforced concrete structures.

When the system is used for the first time, nitrifying bacteria are required to be put into the biological filler in the aerobic tank 2, denitrifying bacteria are required to be put into the anaerobic tank 3, a phosphorus removing agent is added into the phosphorus removing tank 4, and then the system is treated by adopting the following steps:

one) make breed sewage get into and deposit filtering ponds 1 and carry out the sediment and filter, the solid particle that is greater than geotechnological cloth equivalent aperture all is detained in the anterior tank of sediment filtering ponds by pasting the filtration partition wall I5 that has geotechnological cloth, and the water after the filtration enters into the rear portion tank of sediment filtering ponds. If the geotextile is blocked after being used for many times, the geotextile can be cleaned or replaced under the condition that the sedimentation filter tank has no water.

Secondly) the water after the precipitation filtration is pumped into the aerobic tank 2 from the front water tank of the precipitation filtration tank by the water pump I6, the aeration pump 8 is started to aerate, gas is injected into the aerobic tank through the aeration pipe, nitrobacteria have high activity under aerobic conditions and propagate on biological fillers to form a biological film, ammonia nitrogen in the water is converted into nitrite by the nitrobacteria, the nitrite is converted into nitrate by the nitrobacteria, the nitration reaction is completed, and meanwhile, the dissolved oxygen concentration of the water is reduced. The biological filler is the main site for nitration reaction. The biological filler is attached to a biological film, has higher activity under sufficient dissolved oxygen concentration, and improves the decomposition effect of organic matters.

The aerobic tank is used for the first time, nitrobacteria are required to be put on the biological filler of the aerobic tank, and the nitrobacteria are not required to be put when the aerobic tank is used again later.

Thirdly), pumping the water body which completes the nitration reaction into an anaerobic tank 3 by a water pump II 11, and carrying out the nitration reaction again on the residual ammonia nitrogen in the water body and trace nitrobacteria on a zeolite water-passing layer 15, thereby further reducing the dissolved oxygen concentration of the water body and creating an anoxic condition for the denitrification reaction of a multi-medium soil layer; then, under the anoxic condition, nitrate generated by the nitration reaction reacts with denitrifying bacteria on the multi-medium soil layer to convert the nitrate into nitrogen, so that the denitrification reaction is completed, and the aim of denitrifying the aquaculture sewage is fulfilled. The anaerobic tank is used for the first time, denitrifying bacteria are required to be put into the anaerobic tank, the anaerobic tank is sealed by the sealing film, the sealing film can be repeatedly used, and the denitrifying bacteria are not required to be put into the anaerobic tank again when the anaerobic tank is used later.

Fourthly) pumping the water body which completes the denitrification reaction into the phosphorus removal tank 4 by adopting a water pump III 17 to complete the phosphorus removal reaction, retaining the precipitated and flocculated impurities in the tank at the front part of the phosphorus removal tank by a filter partition wall II 18, and enabling the clear water to enter the tank at the rear part of the phosphorus removal tank so as to supply water for aquaculture and reuse.

In this embodiment, the more specific method is: and step two), starting the aeration pump 8 to carry out intermittent aeration, controlling the concentration of dissolved oxygen in the aerobic tank to be 2-3 mg/L, maintaining the concentration for 1-2 days, stopping aeration, retaining the water body in the aerobic tank for 2-3 days, and pumping the water body into the anaerobic tank. The aeration pump 8 can properly improve the concentration of dissolved oxygen in the aerobic tank and reduce the power consumption. And step three), controlling the concentration of dissolved oxygen in the anaerobic tank 3 to be less than 0.5mg/L, and controlling the time of the water body staying in the anaerobic tank to be 2-4 days, so that the sewage treatment effect is better.

The multi-medium soil which forms the multi-medium soil layer is formed by mixing soil, charcoal and scrap iron, and the multi-medium soil layer is a denitrification reaction generation place.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the scope of the present invention.

Claims (4)

1. A culture sewage treatment system based on a multi-medium soil infiltration technology is characterized by comprising a sedimentation filter tank, an aerobic tank, an anaerobic tank and a phosphorus removal tank which are connected in sequence,

the sedimentation and filtration tank is divided into a front tank and a rear tank by a filter partition wall I,

the bottom of the aerobic tank is provided with a bearing layer, the bearing layer is provided with biological filler, an aeration pipe is arranged below the biological filler and is connected with an aeration pump, the aeration pump is arranged outside the aerobic tank,

the rear tank groove of the sedimentation and filtration tank is connected with the top of the aerobic tank through a water pipe I, a water suction pump I is arranged on the water pipe I,

the bottom in anaerobism pond is equipped with out the water gravel layer the top in anaerobism pond is equipped with the seal membrane go out to be equipped with zeolite water passing layer on the water gravel layer be equipped with the multi-media soil horizon in the zeolite water passing layer be equipped with into water gravel layer on the multi-media soil horizon, it sets up to advance water gravel layer the top in anaerobism pond, the below of seal membrane,

the bottom of the aerobic tank is connected with the top of the anaerobic tank through a water pipe II, a water suction pump II is arranged on the water pipe II,

the dephosphorization tank is divided into a front tank and a rear tank by a filter partition wall II,

and the tank at the rear part of the dephosphorization tank is connected with the bottom of the anaerobic tank through a water pipe III, and a water suction pump III is arranged on the water pipe III.

2. The system for treating aquaculture sewage based on multimedia soil infiltration technology of claim 1, wherein said filtering partition wall I and said filtering partition wall II are identical in structure, and are provided with water through holes, and geotextile is attached to the upstream side wall surface.

3. The aquaculture sewage treatment system based on the multimedia soil infiltration technology of claim 2, wherein the equivalent pore diameter of the geotextile is 0.07-0.2 mm.

4. The system for treating aquaculture sewage based on multimedia soil infiltration technology of claim 1, wherein said sedimentation filtration tank, said aerobic tank, said anaerobic tank and said phosphorus removal tank are all made of reinforced concrete structure.

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