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PCB ammonia-nitrogen wastewater zero discharge treatment method and device thereof

A technology for ammonia nitrogen wastewater and treatment methods, applied in water/sewage treatment, natural water treatment, neutralized water/sewage treatment, etc., can solve problems such as not suitable for zero discharge indicators, low treatment efficiency, large land occupation, etc., and achieve environmental protection significant effect

Active Publication Date: 2016-04-27
珠海市华泰环保科技股份有限公司
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Problems solved by technology

[0013] Biological deamination method: using microbial degradation to denitrify, the treatment efficiency is relatively low, and it occupies a large area. At the same time, biological methods cannot remove Cl in wastewater - , not suitable for zero emission indicators
[0014] Comprehensive analysis of the above existing technical principles, if zero discharge and direct reuse after on-line treatment are the goals, none of the existing technologies can achieve simultaneous ammonia nitrogen and Cl - Removed at the same time, so none of them can meet the requirements of achieving zero discharge and reuse

Method used

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  • PCB ammonia-nitrogen wastewater zero discharge treatment method and device thereof
  • PCB ammonia-nitrogen wastewater zero discharge treatment method and device thereof
  • PCB ammonia-nitrogen wastewater zero discharge treatment method and device thereof

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Embodiment Construction

[0068] Adjust the pH of the etching wastewater (i.e. primary washing water) to 10-11, and filter out Cu(OH) by filter bag and ultrafiltration system 2 Finally, the water is introduced into the electrolysis system, and the same sewage is electrolyzed with different current densities and different distances between electrode plates, and the electrolyzed water is directly reused to the secondary washing in the etching section after an ultrafiltration, and the secondary washing overflows to First-level water washing, using alkaline etching solution to absorb the gas generated by electrolysis. According to this, the system is continuously circulated for one week, and the concentration of each pollutant in the secondary washing water on the first day and the seventh day is detected and tracked during the implementation process. The specific implementation conditions and implementation effects are detailed in Table 3.

[0069] Implementation conditions and effects of table 3 embodim...

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Abstract

The invention discloses a PCB ammonia-nitrogen wastewater zero discharge treatment method and a device thereof. The invention is characterized in that the method comprises the following steps: adjusting pH value of etching washing wastewater to 8-11, carrying out rough filtration and ultrafiltration successively, electrolyzing a filtrate I by the use of electrodes with plate electrode distance D being less than or equal to 3 CM and an electrolysis system with electric current density being 1-3 ADS, and adsorbing the generated gas by the use of an alkaline etching liquid; treating the electrolyzed filtrate through a ultrafiltration system so as to obtain a filtrate II, and reusing the filtrate II. Local concentration of the electrolysis product between the plate electrodes is changed by adjusting the distance of the plate electrodes, and chlorine gas generated from the positive electrode escapes in a gaseous state due to too high local concentration so as to synchronously remove ammonia nitrogen and Cl<->. Thus, an effluent obtained after the treatment accords with technical requirements of the etching washing water and satisfies industrial reuse water so as to realize zero discharge.

Description

technical field [0001] The invention relates to the technical field of PCB wastewater treatment, in particular to a zero-discharge treatment method and device for PCB wastewater containing ammonia nitrogen. Background technique [0002] With the rapid development of the electronics industry, the demand for printed circuit boards is increasing. The production of PCB has become an important basic industry in the electronics industry, and the pollution of PCB industrial wastewater has become more and more prominent with the improvement of environmental protection requirements. Among them The treatment of ammonia nitrogen-containing wastewater has become a hot spot in the industry. The ammonia nitrogen-containing wastewater of the circuit board mainly comes from the washing water of the etching process, and the wastewater mainly contains ammonia nitrogen, divalent copper ions and chloride ions. [0003] Zero discharge is the most ideal result of industrial production, and it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/469C02F103/34
CPCC02F1/001C02F1/444C02F1/46104C02F1/469C02F1/52C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/46133C02F2103/34
Inventor 陈丽珊李虹侯延辉王维亮
Owner 珠海市华泰环保科技股份有限公司
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