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Treatment method for waste water containing complex copper

A technology for complexing copper and wastewater, applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of increasing the possibility of hydrogen sulfide precipitation, unfavorable industrial production, and poor primary treatment effect and other problems, to achieve the effects of improving biodegradability, easy control of the treatment process, and reducing treatment costs

Inactive Publication Date: 2013-07-03
PEKING UNIV FOUNDER GRP CO LTD +1
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Problems solved by technology

[0006] Chinese patent application CN 200710074651.5 discloses a complete treatment process for circuit board production wastewater, wherein the copper-based wastewater is adjusted to a pH of about 9 by adding sodium hydroxide and calcium hydroxide through the process of pH adjustment and reduction replacement, and finally Treat with sodium sulfide and mix it with common washing water after coagulation and precipitation. This method has the following technical defects: the process flow is too long, and more one-time investment is required, which is not conducive to industrial production; the primary treatment effect is poor, so it needs to be processed. Multiple treatments; the high COD wastewater needs to be mixed with other wastewater even if it reaches the discharge standard after biochemical treatment, which results in the need for greater facility investment in the follow-up, and the repeated addition of reducing agent treatment increases the possibility of hydrogen sulfide precipitation, etc. question

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Embodiment approach

[0048] (1) Diversion and separate collection of wastewater

[0049] Wastewater treatment, especially the more complex wastewater in the circuit board industry, is basically classified and discharged on the production line, so that classified and diverted discharge provides a guarantee for subsequent treatment to meet standards. Therefore, the production line needs to divert and collect such wastewater separately, and the collection pool must have a certain buffer and homogenization function.

[0050] The treatment method provided by the present invention is mainly aimed at the treatment of EDTA-Cu and ammonia-copper mixed wastewater. The heavy metal copper in this type of wastewater exists in a complex state, and the purpose of removing copper pollutants can only be achieved after the complex is broken. , while other types of low-copper-containing wastewater can be separated separately, and heavy metals can be removed by simple alkali precipitation. The advantage of the above-...

Embodiment 1

[0072] The EDTA-Cu wastewater discharged from the PTH line and the ammonia-copper wastewater discharged from the etching line are pumped at a distance of 50m 3 / h is continuously pumped into the treatment tank 1, and the mechanical stirring speed is 60rpm / min for continuous stirring. At this time, the copper content in the waste water is 60mg / l, and the COD is 200mg / l.

[0073] The control in the following operations adopts the Siemens PLC automatic control system, the model is ST-300. The pH is adjusted to 2 through automatic pH control, and 10% by weight of ferrous sulfate is added to the above-mentioned wastewater at 20 L / min at the same time, and the wastewater after fully reacting and breaking the network enters the treatment pool 2, and then the hydrogen is released through the automatic pH control. Sodium oxide is added to the waste water to adjust the pH of the waste water, the pH is controlled at 8.5, and the stirring speed is 60 rpm / min. The wastewater after adjusti...

Embodiment 2

[0078] The EDTA-Cu wastewater discharged from the PTH line and the ammonia-copper wastewater discharged from the etching line are pumped at a distance of 30m 3 / h is continuously pumped into the treatment tank 1, and the mechanical stirring speed is 60rpm / min for continuous stirring. At this time, the copper content in the waste water is 60mg / l, and the COD is 200mg / l.

[0079] The control in the following operations adopts the Siemens PLC automatic control system, the model is ST-300. The pH is adjusted to 3 by automatic pH control, and 10% by weight of ferrous sulfate is added to the above-mentioned wastewater at 10L / min at the same time, and the wastewater after fully reacting and breaking the network enters the treatment pool 2, and then the hydrogen is released by automatic pH control. Sodium oxide is added to the wastewater to adjust the pH of the wastewater, the pH is controlled at 9.5, and the stirring speed is 60 rpm / min. The wastewater after adjusting the alkalinity...

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Abstract

The invention provides a treatment method for waste water containing complex copper. The method comprises the following steps: 1) providing waste water containing complex copper, wherein the waste water includes EDTA-Cu waste water and ammonia-copper waste water; 2) adjusting the pH value of the waste water containing complex copper to 2.0 to 3.0 and adding ferrous sulphate so as to allow copper in the waste water to be converted into cuprous ions; and 3) adjusting the pH value of the waste water obtained in step 2) to 8.0 to 10.5 so as to allow the cuprous ions in the waste water to be converted into cuprous hydroxide or cuprous oxide deposition. Compared with the prior art, the method provided by the invention has the following advantages and beneficial effects: operation steps are simplified, waste water treatment cost is reduced, treatment process is easy to control and can be easily implemented in a conventional process, and the method accords with requirements of industrial mass production.

Description

technical field [0001] The invention belongs to the field of circuit board wastewater treatment technology, and more specifically relates to a treatment method for wastewater containing complexed copper. Background technique [0002] With the rapid development of the electronic product production industry, the output and scale of circuit board production are increasing. Among them, the wastewater discharge of large and medium-sized professional production plants is about 1000-20000T / D. According to the requirements of the first-level discharge standard of the "Comprehensive Wastewater Discharge Standard" (DB44-26) of the People's Republic of China: pH between 6-9; COD≤90mg / l; Cu 2+ ≤0.5mg / l. [0003] The circuit board industry, including traditional single-sided boards, double-sided boards, multi-layer boards, and high-density interconnection boards and packaging machine boards, the main pollutant in the discharged wastewater is Cu 2+ Mainly heavy metal ions and organic co...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14
CPCC02F1/56C02F1/66C02F2101/20C02F2101/303C02F1/62
Inventor 周波
Owner PEKING UNIV FOUNDER GRP CO LTD
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