Technology for processing wastewaters in PCB (printed circuit board) industrial park

Abstract

The invention discloses a technology for processing wastewaters in a PCB industrial park. The technology comprises the following steps: 1, dividing the wastewaters into a comprehensive wastewater, a complex wastewater, a wastewater containing nickel and cyanogen, an acid waste, an organic waste, an organic wastewater, domestic sewage, and an accident wastewater according to water qualities of various wastewaters, respectively collecting them, and allowing them to enter different wastewater collection pools; 2, respectively carrying out heavy metal removal processing through a corresponding method according to water quality characteristics of the wastewater in each wastewater collection pool, wherein there is no need to carry out the heavy metal removal processing on the domestic sewage; and 3, processing all the wastewaters according to a biochemical processing process. According to the invention, the wastewaters in the whole PCB industrial park are detailedly classified, different present wastewater processing processes are adopted to carry out the heavy metal removal processing according to the different water quality characteristics of the wastewaters, and then the biochemical processing is adopted to further remove heavy metals from the wastewaters, so the COD (chemical oxygen demand) in each obtained discharged water is less than 40mg / L.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a PCB industrial park wastewater treatment process. Background technique [0002] The PCB industry has always been a heavily polluting industry. Since its pollutants are heavy metals, its pollutant treatment, especially wastewater treatment, has always attracted much attention. [0003] Due to the wide dispersion of PCB factories, although the amount of wastewater is relatively small, the area of ​​pollution diffusion is relatively large, and the pollution caused is not easy to control. The wastewater they discharge is highly toxic, and even contains highly toxic substances that are carcinogenic, teratogenic, and mutagenic. [0004] The PCB industry has caused serious pollution to the environment. In addition to the high pollution intensity of PCB wastewater mentioned above, the difficulty of treatment, and the high cost of treatment, the deeper reasons are: [0005] (1) Mos...

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Problems solved by technology

[0005] (1) Most companies in the PCB industry are generally small in scale and have a small displacement, and are unwilling to invest in reasonable costs for pollution control. Therefore, many PCB companies have simple pollution control facilities and poor pollution control effects;

[0006] (2) The cost of breaking the law is less than the cost of abiding by the law, resulting in a considerable number of enterprises having serious leaks and sneaky discharges of PCB wastewater

[0012] Although there are many advantages in establishing an industrial park, there are also many problems. First of all, due to the concentration of many PCB companies in the industrial park and the diversification of PCB production processes, the wastewater classification of most industrial parks today is only divided into three or four categories. The water classification is not clear, and many wastewaters that cannot be mixed are mixed and treated, resulting in increased wastewater treatment costs and difficulties, and the treatment effect is not good

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