doi:10.16597/j.cnki.issn.1002-154x.2025.05.005
某金属加工厂生产废水处理工艺及其效果分析
华承鑫1 黄华莉2 王静2*
(1. 武汉环境投资开发集团有限公司，武汉 430013; 2. 武汉生物工程学院 化学与环境工程学院，武汉 430415)
摘 要 自行监测是企业履行排污许可责任的重要手段。某金属加工厂由于生产工艺中有酸洗工序，因此进入废水处理站的生产废水为含有大量铁离子的酸性废水。该废水经聚合氯化铝(PAC)和聚丙烯酰胺(PAM)复合混凝沉淀处理后，排入市政管网。本研究于废水总排放口取样，对水样中总磷、总氮、化学需氧量、氟化物和总铁浓度进行检测分析。检测结果显示，非连续采集的3个水样中总磷、总氮、化学需氧量、氟化物和总铁浓度的检测结果均低于《钢铁工业水污染物排放标准》(GB 13456—2012)表Ⅱ规定的污染物排放浓度限值。从以上指标来看，该厂废水经PAC和PAM复合混凝沉淀处理后，可以有效去除废水中总磷、总氮、化学需氧量、氟化物和总铁等污染物，满足排入市政管网标准要求。本研究的结果可为判断该金属加工厂生产废水是否满足排放标准要求提供依据，同时为该金属加工厂废水处理站处理工艺效果分析提供数据支持。
关键词 总磷 总氮 化学需氧量 氟化物 总铁 混凝沉淀
Process and Effect Analysis of Wastewater Treatment in a Metal Processing Plant
HUA Chengxin1 HUANG Huali2 WANG Jing2*
(1. Wuhan Environmental Investment and Development Group Co., Ltd., Wuhan 430013, China; 2. College of Chemistry and Environmental Engineering, Wuhan University of Bioengineering, Wuhan 430415, China)
Abstract The self-monitoring of enterprises is an important means to fulfill the responsibility of pollutant discharge permits. Due to the acid washing process in the production process of this metal processing plant, the production wastewater entering the wastewater treatment station is mainly acidic wastewater containing a large amount of iron ions. After being treated with PAC and PAM composite coagulation and sedimentation, the wastewater is discharged into the municipal pipeline network. This study collected samples from the wastewater discharge outlet and analyzed the concentrations of total phosphorus, total nitrogen, chemical oxygen demand, fluoride, and total iron in the water samples. The test results showed that the concentrations of total phosphorus, total nitrogen, chemical oxygen demand, fluoride, and total iron in the three non continuously collected water samples were all lower than the pollutant allowable discharge concentration limits specified in Table II of the “Steel Industry Water Pollutant Discharge Standard” (GB 13456—2012). From the above indicators, it can be seen that the wastewater from the factory can effectively remove pollutants such as total phosphorus, total nitrogen, chemical oxygen demand, fluoride, and total iron after PAC and PAM composite coagulation and sedimentation treatment, meeting the requirements for discharge into the municipal pipeline network. The results of this study can provide a basis for whether the production wastewater of the metal processing plant meets the discharge standard requirements, and also provide data support for the analysis of the treatment process effect of the wastewater treatment station of the metal processing plant.
Keywords total phosphorus total nitrogen chemical oxygen demand fluoride total iron coagulation sedimentation