LIANGXiao-jun,LIQiu,WANGZhi-yu,et al.Removal and Optimization of Emerging Contaminants by Conventional Treatment Processes in Waterworks[J].China Water & Wastewater,2025,41(13):56-62.
给水厂常规处理工艺对新污染物的去除及优化
- Title:
- Removal and Optimization of Emerging Contaminants by Conventional Treatment Processes in Waterworks
- Keywords:
- waterworks; emerging contaminants (ECs); powdered activated carbon; atrazine (ATZ); propisochlor (PPS)
- 摘要:
- 为了解给水处理厂常规工艺对水源水中新污染物的去除效果，对广州某给水处理厂各工艺出水的特征新污染物进行了检测。结果表明，该水厂常规工艺可以有效去除双酚A、4-n-壬基酚、布洛芬、罗红霉素和磺胺二甲嘧啶，去除率为86.24%~99.62%；但对阿特拉津（ATZ）和异丙草胺（PPS）的去除率分别仅为1.18%和29.93%，表明部分农药类新污染物难以通过常规工艺去除。模拟该水厂的运行条件，探究了粉末活性炭（粉炭）及其耦合絮凝技术对目标污染物的去除效果。结果表明，投加20 mg/L粉炭，可显著提高对ATZ和PPS的去除率，分别达到66.97%和67.84%。粉炭耦合絮凝技术对大部分目标污染物的去除率低于单独粉炭，可能是由于絮体包裹部分粉炭，进而减少了粉炭与污染物的接触。然而，粉炭耦合絮凝技术对ATZ的去除效果（72.09%）优于单独使用粉炭的，可能是粉炭对ATZ的吸附速度快于絮凝沉降速度，即粉炭优先吸附ATZ。
- Abstract:
- In order to understand the effect of conventional processes on the removal of emerging contaminants in water sources, the emerging contaminants in the effluent from a waterworks in Guangzhou were tested. The results showed that the conventional process could effectively remove bisphenol A, 4-n-nonylphenol, ibuprofen, roxithromycin and sulfadimidine, and the removal rates were 86.24%-99.62%. However, the removal rates of atrazine (ATZ) and propisochlor (PPS) were only 1.18% and 29.93%, indicating that some new pesticide pollutants were difficult to be removed by conventional processes. The operation conditions of the waterworks were simulated and the removal effect of powdered activated carbon and its coupled flocculation technology on target contaminants was investigated. The results showed that the removal rates of ATZ and PPS could be significantly increased by adding 20 mg/L powdered activated carbon, reaching 66.97% and 67.84% respectively. The efficiency of powdered activated carbon coupling flocculation was lower than that of powdered activated carbon alone for the removal of most of the target contaminants, possibly because the floc was partially coated with powdered activated carbon, thereby reducing their contact. However, the ATZ removal effect (72.09%) of the coupled process was better than that of powdered activated carbon alone, possibly because the adsorption rate of ATZ by powdered activated carbon was faster than the flocculation settling rate, that was, the adsorption of ATZ by powdered activated carbon was preferred.
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