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Device and method for short-cut nitrification of swine farm biogas slurry in artificial wetland based on zeolite filler

A technology of artificial wetland and short-range nitrification, which is applied in chemical instruments and methods, sustainable biological treatment, animal husbandry wastewater treatment, etc., can solve the problem of low hydraulic load of nitrite nitrogen, and achieve increased hydraulic load, stable short-range nitrification, The effect of low energy consumption

Active Publication Date: 2020-07-10
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI +1
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Problems solved by technology

[0005] Aiming at the difficult problem of stable generation of nitrite nitrogen and low hydraulic load by adopting artificial wetland and other ecological treatment technologies for biogas slurry in pig farms, the primary purpose of the present invention is to provide a constructed wetland based on zeolite filler to treat pig farm biogas slurry in a short-range Nitrification device

Method used

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  • Device and method for short-cut nitrification of swine farm biogas slurry in artificial wetland based on zeolite filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The hydraulic load of this embodiment is 0.64m 3 / (m 2 d). The structure of the device is as figure 1 shown. In this embodiment, the heights of wetland I and wetland II are 1.40m and 0.20m respectively, and the height ratio is 7:1. The water distribution device 23 sprays the waste water evenly on the surface of the wetland I, and the percolated waste water enters the wetland II. Because the electric valve 26 is closed, the water level in the wetland II keeps rising. When the water inflow ends, the water level rises to the interface between Wetland I and Wetland II. A drainage-ventilation pipe 24 is arranged in the gravel layer 22 for discharging the treated waste water out of the system and supplying the system with ventilation and oxygen when it dries up. Drainage-ventilation pipe 24 is equipped with tee 25 at the outer part of the pond, and its two ends are connected air inlet pipe 27 and electric valve 26 respectively. The equipment is controlled by a time con...

Embodiment 2

[0050] The hydraulic load of this embodiment is 0.64m 3 / (m 2 d), the same as in Example 1. The structure of the device is as figure 1 shown. The arrangement sequence of the filler layers in this embodiment is exactly the same as that in Embodiment 1, the main difference is that the first zeolite functional layer 20 and the second zeolite functional layer 21 are filled with mixed fillers of zeolite and crushed stone, and the volume ratio of zeolite to crushed stone is 1.5:1.

[0051] The test also used biogas slurry from a pig farm as raw water. The specific water quality is as follows: pH is 7.35-7.77, COD is 725-1100mg / L, ammonia nitrogen is 680-1232mg / L, nitrate nitrogen is <1mg / L, nitrite state Nitrogen is <1mg / L.

[0052] After the system runs stably, the water quality after treatment by the new constructed wetland device is as follows: pH is 6.27-7.51, COD is 362-930mg / L, ammonia nitrogen is 221-473mg / L, nitrite nitrogen is 432-642mg / L, nitrate Nitrogen is 3-46mg / L...

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Abstract

The invention relates to a device and method for achieving partial nitrification by treating pig farm biogas slurry in artificial wetland based on a zeolite filler. The device comprises a biogas slurry pool or a coagulation sedimentation water outlet pool, and an artificial wetland; the artificial wetland adopts a vertical flow and a tidal flow superposition manner, uses zeolite as a main body filler, the biogas slurry is uniformly sprayed on the surface of the wetland, and when the biogas slurry percolates downward to the vertically penetrate through the wetland, part of ammonia nitrogen is adsorbed by the zeolite, and ammonia oxidizing bacteria on a biofilm on the surface of the filler are oxidized into nitrite nitrogen; wastewater percolates downward into a tidal flow wetland, an electric valve on a water draining pipe is turned off, and the water level of the tidal flow wetland rises tilll it is completely submerged; during a flooding period, the filler further adsorbs the ammonianitrogen, meanwhile oxygen-deficit denitrification is executed, then the electric valve is turned on for water drainage, the system is in a dry environment, and a medium pressure fan supplies oxygen for the system. The device has simple structure, large hydraulic load and low operation energy consumption and can provide a substrate for a subsequent denitrification process such as anaerobic ammonium oxidation at a low cost without regulation of DO and pH of wastewater.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in environmental engineering, and in particular relates to a device and method for short-range nitrification of pig farm biogas slurry treated by artificial wetland based on zeolite filler. Background technique [0002] In recent years, my country's hog production accounts for more than 50% of the world's total hog production, making it the world's largest hog producer. However, it is accompanied by tremendous pressure on environmental protection. Pig wastewater contains high concentrations of organic matter, ammonia nitrogen, and phosphorus. If it is discharged into environmental water bodies or reused in planting without effective treatment, it will cause direct harm to the environment and agricultural ecology, and then threaten human health. At present, most large-scale pig farms are equipped with anaerobic digesters. After the pig wastewater is treated by anaerobic fermentation, a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F101/16C02F103/20
CPCC02F3/107C02F2101/16C02F2103/20Y02W10/10
Inventor 杨永强孙晓文李宁吴世军陈繁荣
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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