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Livestock breeding wastewater nutrient pollution control and recycling process

A technology for livestock and poultry breeding wastewater and pollution control, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. problems such as comprehensive utilization and difficulty in achieving emission standards

Inactive Publication Date: 2013-09-25
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wastewater after anaerobic fermentation still contains high concentrations of COD, nitrogen, phosphorus and other pollutants, and it is difficult to achieve standard discharge through conventional activated sludge aerobic treatment, especially the removal of ammonia nitrogen and phosphorus
Therefore, the removal of nitrogen and phosphorus nutrients in anaerobic fermentation of livestock and poultry wastewater is a bottleneck problem that restricts the discharge and resource utilization of livestock and poultry wastewater.

Method used

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  • Livestock breeding wastewater nutrient pollution control and recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The livestock and poultry breeding wastewater (average water quality is COD 1753.7mg / L, TP 52.9mg / L, PO 4 3- -P 39.5mg / L, NH 4 + -N 646.6mg / L, Mg 60mg / L, pH 7.06, alkalinity 60mmol / L), at 0.28m 3 The flow rate of / h is injected into the pre-regulation tank. After adjusting the water quality and quantity, it is injected into the sequence batch MAP reactor and the continuous flow MAP reactor respectively; the sequence batch MAP reactor has a reactor height of 2.5m, a diameter of 1.0m, and an effective volume 1.0m 3 , the crystal trap is set inside. The trap is made of stainless steel wire mesh and is in the shape of four concentric cylinders with a diameter of 0.8m and a height of 1.0m. The bottom of the reactor is a conical crystal collection bucket for collecting MAP crystals that cannot be trapped by the trap; The sequence batch MAP reactor adopts the SBR operation mode, the water intake is 0.5h, the aeration reaction is 2h, the precipitation is 1h, the water outl...

Embodiment 2

[0029] The livestock and poultry breeding wastewater (average water quality is COD 1765.6mg / L, TP 59.4mg / L, PO 4 3- -P 41.0mg / L, NH 4 + -N 650.1mg / L, Mg 65mg / L, pH 7.12, alkalinity 62mmol / L), at 0.42m 3 The flow rate of / h is injected into the pre-regulation tank. After adjusting the water quality and quantity, it is injected into the sequence batch MAP reactor and the continuous flow MAP reactor respectively; the sequence batch MAP reactor has a reactor height of 2.5m, a diameter of 1.0m, and an effective volume 1.0m 3, the crystal trap is set inside. The trap is made of stainless steel wire mesh and is in the shape of four concentric cylinders with a diameter of 0.8m and a height of 1.0m. The bottom of the reactor is a conical crystal collection bucket for collecting MAP crystals that cannot be trapped by the trap; The sequence batch MAP reactor adopts the SBR operation mode, the water intake is 0.5h, the aeration reaction is 0.5h, the precipitation is 1.5h, the water o...

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Abstract

The invention discloses a livestock breeding wastewater nutrient pollution control and recycling process, which mainly comprises the following steps of: making livestock breeding wastewater (1) subjected to anaerobic treatment pass through a front adjusting tank (2), respectively injecting into a sequencing batch MAP (3) or continuous-flow MAP reactor (4), blowing off soluble CO2 through exposure to improve the pH of the wastewater, and trapping and recycling magnesium ammonium phosphate crystals generated by combining PO43- with NH4+ and Mg2+ in the wastewater by using a trap (10); making the wastewater pass through a middle adjusting tank (5) and enter an MBBR reactor (6) to remove COD and NH4+-N; and settling the effluent in a sedimentation tank (7) and discharging. In the process, the MAP technology and MBBR technology are combined, phosphorus is removed and recycled by a physicochemical method, and the COD and the NH4+-N are removed by a biomembrane method so as to realize the standard drainage of the wastewater and recycle nutrient elements such as N, P and Mg. The process is simple and convenient to operate and is stable to run.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource utilization thereof, and specifically relates to a process capable of effectively removing and recovering nutrient elements in livestock and poultry breeding wastewater. Background technique [0002] Livestock and poultry breeding sewage is a high-concentration organic wastewater with high concentrations of COD, ammonia nitrogen and phosphorus, which is difficult and costly to treat. In the livestock and poultry breeding industry, pig wastewater pollution is a ubiquitous and representative form of pollution. Livestock and poultry breeding wastewater has the following characteristics: first, large discharge volume and large impact load; second, solid-liquid mixture, high concentration of organic matter, and difficult treatment; third, particularly high N and P nutrient content, and low carbon-nitrogen ratio. The profit of the livestock and poultry breeding industry is low and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C01B25/45
Inventor 宋永会彭剑峰邱光磊崔晓宇袁鹏曾萍
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI