PCB行业双膜法中水回用预处理技术和工程示范  

Pretreatment Technology of Dual Membrane Process for Reclaimed Water Reuse and Its Engineering Demonstration in PCB Industry

作　　者：薛方勤[1] 刘莉 王欣[1] 付宏祥[1] XUE Fang-qin;LIU Li;WANG Xin;FU Hong-xiang(Beijing Guohuan Tsinghua Environmental Engineering Design and Research Institute Co.Ltd.,Beijing 100084,China)

机构地区：[1]北京国环清华环境工程设计研究院有限公司,北京100084

出　　处：《中国给水排水》2021年第17期100-106,共7页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07101-003)。

摘　　要：针对印刷电路板(PCB)行业双膜法中水回用系统普遍存在的反渗透膜寿命短、合格进膜原水不足导致双膜系统产能不足等问题,在对示范企业调研的基础上,将原水分为清废水和污废水两类,清废水在能保障去除一些氧化性物质(如余氯)的基础上可直接进入反渗透系统,污废水则需要经芬顿氧化工艺同步脱除有机物和重金属后才能进入双膜系统,芬顿氧化工艺对络合态铜和镍有破络合的作用。对芬顿氧化法中pH值、反应时间、双氧水投加量、双氧水和亚铁比例等参数进行了小试研究和中试验证,同时在芬顿氧化法后增加曝气生物滤池(BAF),进一步去除COD,在此条件下,出水COD<120 mg/L、铜离子<2 mg/L,基本满足进入双膜系统的条件。通过上述研究,确定了基于清污分流和芬顿氧化同步去除有机物和重金属的PCB生产废水预处理技术,并进行了工程示范,达到了预期效果。There are some common problems, such as short service life of the reverse osmosis(RO) membrane and insufficient capacity of the dual membrane system in the printed circuit board(PCB) industry. Based on the investigation of several demonstration companies, the raw water was divided into two categories: light wastewater and heavy wastewater. The light wastewater was directly fed into the RO system on the basis of the removal of some oxidizing substances(such as residual chlorine). Meanwhile, the heavy wastewater was treated by the Fenton oxidation process to simultaneously remove the organic pollutants and heavy metals before entering the dual membrane system, and the Fenton oxidation process could break the copper and nickel complexes. The parameters of Fenton oxidation, such as pH, reaction time, the dosage of hydrogen peroxide and the ratio of hydrogen peroxide to ferrous oxide, were explored in bench experiments and verified in a pilot project. Furthermore, a biological aerated filter(BAF) was added after the Fenton oxidation process to further remove the COD. Under these conditions, the COD and copper ion in the effluent were less than 120 mg/L and 2 mg/L, respectively, which met the requirements to enter the dual membrane process. Therefore, a technology for PCB production wastewater pretreatment based on light and heavy wastewater diversion and simultaneous removal of organics and heavy metals by Fenton oxidation was determined and demonstrated in an actual project with an expected performance.

关 键 词：印刷电路板生产废水 中水回用 双膜法 清污分流 芬顿氧化 

分 类 号：TU992[建筑科学—市政工程]