Method for treating swine wastewater

A treatment method and waste water technology, which is applied in animal husbandry waste water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the unsustainable recycling of magnesium ammonium phosphate and affect the recycling of magnesium ammonium phosphate , no ammonia nitrogen removal performance and other problems, to achieve the effect of low treatment cost, low project investment cost, and solve pollution problems

Active Publication Date: 2015-12-02
播恩集团股份有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

At present, the existing recycling technology of magnesium ammonium phosphate is mainly realized by NaOH pyrolysis and high-temperature direct pyrolysis. To achieve the recycling of phosphorus and magnesium, but this kind of pyrolysis method is very easy to produce by-product Mg without any ammonia nitrogen removal performance 2 P 2 o 7 , making the recycling of magnesium ammonium phosphate unsustainable, and as the number of recycling increases, Mg 2 P 2 o 7 The amount of production is also gradually increasing, which greatly affects the recycling effect of magnesium ammonium phosphate

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  • Method for treating swine wastewater

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Effect test

Embodiment 1

[0029] according to figure 1 The schematic flow chart of the processing method of the shown pig wastewater, at first:

[0030] a. Take 1m 3Pig raising wastewater with an ammonia nitrogen concentration of 890mg / L and a phosphorus concentration of 135mg / L is added to the electrolytic phosphorus recovery pool 1, the anode magnesium metal plate 3 of the electrolytic phosphorus recovery pool has a magnesium content of 92%, and the cathode 2 is a stainless steel mesh, and then the direct current is turned on Power supply, adjust the current density at 120mA / cm, and release magnesium ions through the electrolysis of the anode magnesium alloy plate. During this period, start the stirrer and control the stirring speed at 220rpm to make the waste water mix evenly. When the pH of the waste water rises to 9, turn off the power. Stop the electrolysis, let stand for 60min to carry out solid-liquid separation, the supernatant enters the ammonia sinking tank 5, and recovers the magnesium amm...

Embodiment 2

[0036] a. Take 1m 3 Pig raising wastewater with an ammonia nitrogen concentration of 890mg / L and a phosphorus concentration of 135mg / L is added to the electrolytic phosphorus recovery pool. The magnesium content of the anode magnesium metal plate of the electrolytic phosphorus recovery pool is 95%, and the cathode is graphite. Then turn on the DC power supply and adjust the current When the density is 180mA / cm, magnesium ions are released through the electrolysis of the anode magnesium alloy plate. During this period, the stirrer is started and the stirring speed is controlled at 180rpm to make the waste water mix evenly. When the pH of the waste water rises to the range of 9.5, turn off the power and stop the electrolysis. Stand still for 90 minutes for solid-liquid separation, the supernatant enters the ammonia sink tank, and recovers the magnesium ammonium phosphate solid precipitated at the bottom of the tank for future use.

[0037] B, the ammonium magnesium phosphate sol...

Embodiment 3

[0042] a. Take 1m 3 Pig raising wastewater with an ammonia nitrogen concentration of 890mg / L and a phosphorus concentration of 135mg / L is added to the electrolytic phosphorus recovery pool 1, the anode magnesium metal plate magnesium 3 content of the electrolytic phosphorus recovery pool is 93%, the cathode is a platinum electrode 2, and then the direct current is turned on Power supply, adjust the current density at 160mA / cm, and release magnesium ions through the electrolysis of the anode magnesium alloy plate. During this period, start the stirrer and control the stirring speed at 200rpm to make the waste water mix evenly. When the pH of the waste water rises to 9.5, turn off the power and stop Electrolysis, standing for 80min for solid-liquid separation, the supernatant enters the ammonia sinking tank 5, and recovers the magnesium ammonium phosphate solid precipitated at the bottom of the tank for future use.

[0043] B, the ammonium magnesium phosphate solid that reclaims...

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Abstract

The invention discloses a method for treating swine wastewater. The method includes the steps that the swine wastewater is injected into an electrolytic phosphorus recycling pond; when the pH is increased to 9 to 9.5, the electrolytic reaction is stopped; after standing is carried out, supernatant liquid enters an ammonia settling pond; recycled magnesium ammonium phosphate solid is added into a magnesium ammonium phosphate electrochemical decomposing pond with the proportion of the mole number of phosphorus in the magnesium ammonium phosphate solid to the mole number of ammonia nitrogen in the wastewater in the ammonia settling pond of 1:1, a magnesium ammonium phosphate electrochemical reaction is carried out, and all generated decomposition products are transferred to the ammonia settling pond; then reacting is carried out for 20 min to 30 min at the pH of 9 to 9.5, magnesium ammonium phosphate generated after solid-liquid separation returns to the magnesium ammonium phosphate electrochemical decomposing pond to be repeatedly used, and after repeated using is carried out 6 to 8 times in this way, fresh recycled magnesium ammonium phosphate is used for replacement. According to the method, operation is easy, the project investment cost is low, the treating cost is low, and the ammonia nitrogen in the wastewater can be efficiently removed under the condition that phosphate and magnesium salt do not need to be added; meanwhile, the magnesium ammonium phosphate solid can be recycled, and the high economic benefits and the high environment benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for treating pig wastewater. Background technique [0002] At present, an important problem facing my country's water ecological environment protection is that the discharge of ammonia nitrogen far exceeds the environmental capacity of the receiving water body, and ammonia nitrogen has surpassed COD to become the primary pollutant affecting the environmental quality of my country's surface water. According to the 2013 "China Environmental Statistical Annual Report", the national discharge of ammonia nitrogen in wastewater reached 2.457 million tons, which is equivalent to nearly 8 times the environmental capacity of the receiving water body. Ammonia nitrogen (NH 3 and NH 4 + ) is a form of existence that has the greatest impact and harm on the aquatic ecological environment among various nitrogen-containing compounds. Compared with other f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01B25/45C02F103/20C02F101/16C02F101/10
Inventor 黄海明刘佳慧肖晶张鹏丁丽
Owner 播恩集团股份有限公司
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