Method for processing waste water generated by extracting copper oxide from acidic corrosion waste fluid

A technology for acid etching waste liquid and treatment method, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , the problem of high cost, to reduce the content of ammonia nitrogen, a large amount of treatment in a short time, reduce the effect of COD

Active Publication Date: 2012-07-18
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

However, during the treatment process, hydrogen sulfide gas is easily generated due to the addition of sodium sulfide in the copper precipitation process, and a small amount of sulfide will still remain in the wastewater after copper precipitation
During the biochemical treatment of the treated wastewater to reduce the ammonia nitrogen content, due to the high content of sodium salts in the wastewater, the bacterial population is extremely easy to die during the biochemical process
This two-step method of treating wastewater not only increases the exhaust gas emission of the wastewater treatment workshop, but also consumes more manpower and material resources, which increases the cost
And in the ammonia nitrogen treatment stage, due to the death of the bacterial flora, the ammonia nitrogen treatment of th

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  • Method for processing waste water generated by extracting copper oxide from acidic corrosion waste fluid
  • Method for processing waste water generated by extracting copper oxide from acidic corrosion waste fluid

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Example Embodiment

[0052] Example 1

[0053] In Example 1, the waste water after extracting copper oxide with the acidic etching waste liquid is prepared by the following method:

[0054] (1) The acidic etching waste liquid is put into the impurity removal liquid storage tank after impurity removal.

[0055] (2) Add 5m to the alkali distribution tank 3 Water, while stirring, add 2.5m 3 The mass concentration is 50% sodium hydroxide solution and 800kg of mixed powder of sodium carbonate and sodium bicarbonate. After the solid is dissolved, put the lye into the lye storage tank.

[0056] (3) Pour 3m into the copper oxide synthesis kettle 3 Clean water is preheated to 85°C with stirring, and the preheated acidic etching waste liquid and lye are poured into it respectively to produce copper oxide. During the reaction process, the reaction temperature was controlled at 75-85°C, the pH was between 7.0-7.5, and the stirring speed was 40r / min. Obtain copper oxide and waste water.

[0057] The co...

Example Embodiment

[0066] Example 2

[0067] Compared with Example 1, under the constant situation of all dosages and reaction conditions, adding available chlorine content is 62.5kg of sodium hypochlorite solution of 8%, and the wastewater index after treatment is as follows:

[0068] pH Copper content (mg / L) Nickel content (mg / L) Lead content (mg / L) Chromium content (mg / L) Ammonia nitrogen content (mg / L) Chlorine content (mg / L) COD content (mg / L) Step (1) processing 8.8 1.2 6.6 1.4 1.2 125 0 92 Step (4) processing 8.5 0.1 0.6 0.1 0.3 5.2 27.4 60

Example Embodiment

[0069] Example 3

[0070] Compared with Example 1, under the constant situation of all dosages and reaction conditions, adding available chlorine content is 8% sodium hypochlorite solution 100.0kg, and the wastewater index after treatment is as follows:

[0071] pH Copper content (mg / L) Nickel content (mg / L) Lead content (mg / L) Chromium content (mg / L) Ammonia nitrogen content (mg / L) Chlorine content (mg / L) COD content (mg / L) Step (1) processing 8.8 1.2 6.6 1.4 1.2 125 0 92 Step (4) processing 8.4 0.1 0.6 0.1 0.3 1.2 11.0 58

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Abstract

The invention discloses a method for processing waste water generated by extracting copper oxide from acidic corrosion waste fluid. The processing method comprises the following steps of: (1) extracting the copper oxide from the acidic corrosion waste fluid through strong alkaline solution, and generating waste water; (2) adopting cationic resin to carry out initial treatment; (3) adding sodium hypochlorite to remove ammonia nitrogen; (4) conveying to a first reaction pond, adding aluminium polychlorid to remove heavy metal ions, then conveying to a second reaction pond, and adding polyacrylamide to carry out sedimentation; and (5) in a settling pond, setting and layering suspending matters in waste water, conveying clear water on an upper layer into an air floating machine to remove the suspending matters, and discharging. According to the processing method, not only can the content of copper ions and ammonia nitrogen in the waste water can be reduced, but also COD (Chemical Oxygen Demand) can be greatly reduced, the processing effect for waste water with low COD content is good, and continuous processing of waste water generated by extracting the copper oxide from the acidic corrosion waste fluid can be realized.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating wastewater after extracting copper oxide from acidic etching waste liquid. Background technique [0002] The acidic or alkaline etching waste liquid of the PCB circuit board factory contains about 10% copper by mass. In order to save resources and reduce the pressure of post-processing, the copper in the etching waste liquid is usually recycled. Recycled forms include copper salts such as copper oxide, copper sulfate, and copper chloride. However, waste water will still be produced after copper recovery, which contains a small amount of copper and a relatively large amount of ammonia nitrogen, which must be further treated before being discharged. [0003] Traditional ammonia nitrogen wastewater treatment mainly adopts alkali stripping method, evaporation concentration method, resin exchange method, biochemical method and so on. Because a la...

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Application Information

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IPC IPC(8): C02F9/04C02F1/42
Inventor 吴阳东王永成刘杨张素娟方健才韩福勇
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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