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
5 Cites 12 Cited by

AI-Extracted Technical Summary

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 used

(3) copper and other heavy metal precipitation: add in the first reaction tank with the flow velocity of 6m3/h through the waste water after step (2) reaction, add polyaluminium chloride content with the flow velocity of 0.2~0.8L/min 5% by mass of polyaluminum chloride solution, and aeration treatment at the same time, so that the remaining copper ions and other metal ions in the wastewater are precipitated; The flow rate is to add a polyacrylamide solution with a polyacrylamide content of 0.1% by mass, and the addition of polyacrylamide can accelerate the sedimentation of suspended solids in wastewater...
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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.

Application Domain

Water/sewage treatment by ion-exchangeMultistage water/sewage treatment

Technology Topic

Environmental chemistryPolyacrylamide +10

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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

Examples

  • Experimental program(7)
  • Comparison scheme(2)

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 composition of described waste water is as follows:
[0058] pH Copper content (mg/L) Nickel content (mg/L) Lead content (mg/L) Chromium content (mg/L) Ammonia nitrogen content (mg/L) COD content (mg/L) 8.8 18 6.6 1.4 1.2 125 92
[0059] The treatment method of the waste water after the acidic etching waste liquid described in the present embodiment extracts copper oxide:
[0060] (1) Preliminary copper precipitation: the waste water after extracting copper oxide from the acidic etching waste liquid is 5m 3 The flow rate per hour is injected into an ion exchange column equipped with styrene-based macroporous chelating cation exchange resin for treatment, and the copper ion content in the treated wastewater is 1.2mg/L.
[0061] (2) Ammonia nitrogen and COD treatment: inject 20 m 3 The pH value, copper, nickel, lead, chromium, ammonia nitrogen, and COD contents of the wastewater treated by ion exchange were measured. Add 53.1 kg of sodium hypochlorite solution with an available chlorine content of 8% under aeration, and add the sodium hypochlorite solution within 20 minutes, and react for 30 minutes under aeration;
[0062] (3) Precipitation of copper and other heavy metals: the waste water after the reaction in step (2) is 6m 3 The flow rate of /h is added to the first reaction tank, and the polyaluminum chloride solution with a polyaluminum chloride content of 5% by mass is added at a flow rate of 0.2~0.8L/min, and aeration treatment is performed at the same time to make the remaining copper ions in the wastewater Precipitation occurs with other metal ions; after fully reacting, it is transferred to the second reaction tank, and a polyacrylamide solution with a polyacrylamide content of 0.1% by mass is added at a flow rate of 0.1~0.9 L/min. The addition of polyacrylamide can accelerate Sedimentation of suspended solids in wastewater.
[0063] (4) The wastewater treated in step (3) enters the inclined tube sedimentation tank to settle the suspended matter, and the upper layer of clean water flows into the air flotation machine for air flotation treatment of the suspended matter, and the pH value, copper , nickel, lead, chromium, ammonia nitrogen, and COD content, enter the clear water pool and then be discharged to the open drainage channel.
[0064] The composition of the wastewater treated in step (1) and step (4) is as follows:
[0065] 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 8.6 0.2 0.6 0.1 0.3 8.6 46.0 75

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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Description & Claims & Application Information

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