半导体行业废水对反渗透膜的污堵机制与控制策略
Mechanism and Control Strategy of Reverse Osmosis Membrane Fouling of Semiconductor Industry Wastewater
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摘要: 半导体行业是我国大力发展的高精尖产业,废水产生量大、再生处理难度高。半导体行业废水再生处理过程中,反渗透(reverse osmosis, RO)是重要的污染物去除单元,但面临的膜污堵问题严重影响了其效率与经济性。笔者梳理了半导体行业废水的种类与典型污染物,总结了半导体行业废水导致反渗透膜污堵的主要机制及控制手段,提出了针对半导体行业废水特点的膜污堵控制策略。半导体生产的不同工序会产生多种废水,其中污染物种类多且可生化性普遍较差。通常,不同种类废水分类经分质收集后,进行相应的预处理,之后部分合流处理并进入RO系统。半导体行业废水反渗透处理系统面临严重的膜污堵问题。金属离子或氟离子易在反渗透膜面形成无机结垢,表面活性剂易形成有机污堵。反渗透膜污堵可通过预处理、膜清洗与运行条件调控等手段进行控制,但大部分现有手段对半导体行业废水造成的污堵控制能力有限。建议未来开发针对关键污染物的预处理技术;并结合半导体生产工序,提出针对污染物关键相互作用关系的废水收集与再生处理整体策略。Abstract: The semiconductor industry is a fast-growing high-tech industry in China, which produces large amount of wastewater with various types of pollutants, resulting in difficult treatment. In the reclamation process of semiconductor industry wastewater, reverse osmosis (RO) has been an important pollutant removal unit, but membrane fouling has seriously affected its efficiency. In this paper, the types of the main pollutants in semiconductor industry wastewater are summarized, the main mechanism of the RO membrane fouling caused by the semiconductor industry wastewater and the related control methods are introduced, and the fouling control strategies are proposed. Different processes of semiconductor production will produce various types of wastewater, among which there are many types of pollutants with complex forms, and generally poor biodegradability. Generally, different types of wastewater are collected according to water quality, after corresponding pretreatment, some of them are combined for further treatment and enter the RO system. The RO treatment system of semiconductor industry wastewater reclamation faces serious membrane fouling problems. Metal ions or fluoride ions are prone to form inorganic scaling on the RO membranes, and surfactants tend to form organic fouling. RO membrane fouling caused by semiconductor wastewater can be controlled by methods of pretreatment, membrane cleaning and operating condition regulation, but most of the existing methods have limited efficiency. It is recommended that researchers can develop targeted pretreatment technology for key pollutants in the future. Moreover, combined with the semiconductor production process, an overall strategy for wastewater collection and reclamation treatment based on the key interaction of pollutants is proposed.
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Key words:
- semiconductor industry wastewater /
- reverse osmosis /
- membrane fouling /
- key pollutants /
- heavy metal /
- surfactants
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