摘要：

某电路板企业的生产废水来源于晒版冲洗废水、显影及显影后清洗废水、脱墨后清洗废水、蚀刻清洗废水、前处理清洗废水、中处理清洗废水、有机可焊性保护层（OSP）抗氧化清洗废水等。将生产废水划分为高浓度有机废水、蚀刻清洗废水及一般清洗废水进行单独预处理后，再汇合进行生化处理及深度处理。结果表明，排放废水经处理后，COD≤95 mg/L、BOD₅≤22.4 mg/L、NH₃-N≤11.3 mg/L、SS≤78 mg/L，稳定达到《电子工艺水污染物排放标准》（GB 39731—2020）间接排放限值和广东省《水污染物排放限值》（DB 44/26—2001）第二时段二级排放标准的较严者；回用水COD≤27 mg/L、BOD₅≤8.14 mg/L、NH₃-N≤2.4 mg/L、电导率≤843 μS/cm，稳定达到《城市污水再生利用 工业用水水质》（GB/T 19923—2005）工艺与产品用水标准后回用至蚀刻、脱墨等生产工艺清洗用水，其废水处理直接运行成本为10.54元/t，中水处理成本为2.72元/t。

关键词: 线路板废水, 中水回用, 酸析, 碱性吹脱, 反渗透

Abstract:

The production wastewater of a circuit board enterprise comes from the printing plate washing wastewater,developing and post-developing cleaning wastewater, deinking cleaning wastewater, etching cleaning wastewater, pre-treatment cleaning wastewater, intermediate treatment cleaning wastewater, and OSP antioxidant cleaning wastewater. The produced wastewater in this project was divided into high-concentration organic wastewater, etching cleaning wastewater, and general cleaning wastewater for separate pretreatment, and then converged for biochemical treatment and advanced treatment. The results showed that the COD, BOD₅, NH₃-N, and SS of the discharged wastewater after treatment were ≤95 mg/L, ≤22.4 mg/L, ≤11.3 mg/L, and ≤78 mg/L, respectively, which reached the indirect emission limit of the “Electronic Process Water Pollutant Emission Standards”(GB 39731—2020) and the second-stage secondary emission standard of the “Water Pollutant Emission Limits”(DB 44/26—2001) in Guangdong Province. The COD, BOD₅, NH₃-N, and conductivity of the reclaimed water were ≤27 mg/L, ≤8.14 mg/L, ≤2.4 mg/L, and ≤843 μS/cm. After meeting the process and product water standards of “Recycling of Urban Sewage for Industrial Water Quality”(GB/T 19923—2005), it could be reused for etching, deinking, and other production processes. The direct operating cost of wastewater treatment in this project was 10.54 yuan/ton of water, and the cost of reclaimed water treatment was 2.72 yuan per ton of water.

Key words: circuit board wastewater, reclaimed water, acid precipitation, alkaline-stripping, reverse osmosis

中图分类号: 

• X703