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Treatment method for urea-containing high concentration copper ammonium wastewater

A copper ammonia wastewater and treatment method technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of inability to effectively precipitate copper ions, ammonia nitrogen cannot be recycled and reused, etc. Solve problems such as complex operation process, achieve good social and economic benefits, convenient operation, and overcome the effect of complex process

Active Publication Date: 2012-11-07
SHANGHAI HUAYI ENERGY CHEM
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Problems solved by technology

[0006] In view of the stable existence of copper ammonium complex in the existing wastewater, the pH of the wastewater is 8-11, the removal is difficult, and the iron filings replacement method and ordinary alkali precipitation method cannot effectively precipitate copper ions. The existing high-concentration ammonia nitrogen wastewater treatment process The ammonia nitrogen after treatment cannot be recycled and reused. At the same time, the existence of urea makes the operation process complicated, and there are problems of high processing cost and high energy consumption.

Method used

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  • Treatment method for urea-containing high concentration copper ammonium wastewater

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Effect test

Embodiment 1

[0029] Get 15.3kg of urea-containing copper ion concentration and add 55.7gNa 2 S·9H 2 O, blast aeration for 1 h; add organic polymer flocculant polyacrylamide (PAM: waste water = 0.1 wt%), let stand, settle for 10 min. In the supernatant, magnesium chloride solution (1mol / L) and disodium hydrogen phosphate solution (0.5mol / L) were added to make Mg 2+ : NH 4 + :PO 4 3- =1.25:1:1.25 (molar ratio), stirred for 20 minutes, and stood still for 30 minutes. The concentration of total copper (calculated as Cu) in the effluent is below 1 mg / L, the concentration of ammonia nitrogen is 40 mg / L, the removal rate of total copper is more than 99.88%, and the removal rate of ammonia nitrogen is 98.67%.

Embodiment 2

[0031] Get 1000kg urea-containing copper ion concentration is 234mg / L, ammonia nitrogen concentration is 1021mg / L in waste water, add sodium sulfide solution, make S 2- : Cu 2+ =1.2:1 (molar ratio); add organic polymer flocculant polyacrylamide (PAM: waste water = 0.1wt%), let stand, and settle for 10 minutes. In the supernatant, magnesium chloride solution (1mol / L) and disodium hydrogen phosphate solution (0.5mol / L) were added to make Mg 2+ : NH 4 + :PO 4 3- =1.25:1:1.25 (molar ratio), stirred for 20 minutes, and stood still for 30 minutes. The concentration of total copper (calculated as Cu) in the effluent was 1.5 mg / L, the concentration of ammonia nitrogen was 12 mg / L, the removal rate of total copper was 99.36%, and the removal rate of ammonia nitrogen was 98.82%.

Embodiment 3

[0033] Get 1kg of urea-containing copper ion concentration is 2056mg / L, ammonia nitrogen concentration is 800mg / L in waste water, add sodium sulfide solution, make S 2- : Cu 2+ =1.2:1 (molar ratio); add organic polymer flocculant polyacrylamide (PAM: waste water = 0.1wt%), let stand, and settle for 10 minutes. In the supernatant, magnesium chloride solution (1mol / L) and disodium hydrogen phosphate solution (0.5mol / L) were added to make Mg 2+ : NH 4 + :PO 4 3- =1.25:1:1.25 (molar ratio), stirred for 20 minutes, and stood still for 30 minutes. The concentration of total copper (calculated as Cu) in the effluent was 2.7mg / L, the concentration of ammonia nitrogen was 23.8mg / L, the removal rate of total copper was 99.87%, and the removal rate of ammonia nitrogen was 97.03%.

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Abstract

The present invention provides a treatment method for urea-containing copper ammonia wastewater. The method is directed at that the existence of a stable copper ammonia complex and a specific reason of containing urea seriously affect the treating process and effect of wastewater treatment for high concentration copper ammonium wastewater, employs the process of a combination method combined the copper sulfide precipitation method for removing copper with the magnesium ammonium phosphate precipitation method to process the copper ammonia complex, helps to solve the treatment of high concentration copper ammonia complex-containing wastewater, helps to overcome the problems that the urea removal for high concentration ammonia nitrogen wastewater is complex in operation process, high in processing costs, and high in energy consumption, has no need of an independent high temperature and high pressure treatment for the urea, is easy in operation and low in cost, and does not need to control the pH value and the temperature in the process. The treatment method can achieve the purpose of recycling resources, and has good social and economic benefits.

Description

technical field [0001] The invention relates to a treatment method for high-concentration copper ammonia wastewater containing urea, belonging to the field of industrial wastewater treatment. Background technique [0002] With the rapid development of my country's economy, accompanied by the rapid increase in population and the rapid expansion of industrial and agricultural scale, water pollution is becoming more and more serious. Among them, due to the large discharge of ammonia nitrogen wastewater, especially the continuous increase in the discharge of high-concentration ammonia nitrogen wastewater, causing marine pollution. Red tides appear, lakes have algae blooms, the eutrophic algae and microorganisms multiply, the dissolved oxygen in the water is excessively consumed, and the reoxygenation rate is significantly lower than the oxygen consumption efficiency, which eventually leads to a large number of fish deaths, and even lakes drying up and perishing. In addition, the ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 付朋肖本端施春辉刘晓翼朱姗王群吴良泉
Owner SHANGHAI HUAYI ENERGY CHEM
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