水厂常规工艺强化去除原水中的2-MIB  

Enhanced 2-MIB Removal in Raw Water by Conventional Processes of WTPs

作　　者：李土雄 刘伟 刘岳峰 范丹 李抄 曾立章 叶晓华 LI Tuxiong;LIU Wei;LIU Yuefeng;FAN Dan;LI Chao;ZENG Lizhang;YE Xiaohua(Shen Shui Bao An Water Group Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]深圳市深水宝安水务集团有限公司,广东深圳518000

出　　处：《净水技术》2025年第2期72-78,94,共8页Water Purification Technology

摘　　要：【目的】为适应《生活饮用水卫生标准》(GB 5749—2022)对2-甲基异莰醇(2-MIB)限值要求,提高常规工艺对2-MIB的去除能力。【方法】文章通过小试和生产性试验,研究常规工艺水厂提升2-MIB去除效果的生产措施,并形成1套适用于常规工艺水厂的,以优化预氧化、两级粉末活性炭吸附和滤池生物降解为核心的全流程多级屏障2-MIB控制技术路线。【结果】结果表明,强化常规工艺水厂2-MIB去除效果主要措施有:优化预氧化剂;采用高锰酸钾替代次氯酸钠预氧化,高锰酸钾投加量宜不超过0.3 mg/L;粉末活性炭吸附可显著提升2-MIB去除效果,且可通过在水库取水头部建设粉末活性炭投加点及投加装置,实现原水+厂内两级粉末活性炭投加,延长粉末活性炭吸附时间,提高吸附效果;优化调整厂内生产运行工艺(包括停用滤前次氯酸钠投加、不含氯反冲洗、延长过滤周期、降低反冲强度等),可有效提升普通砂滤池对2-MIB的生物降解作用,培养周期约为4个月,2-MIB滤池去除率可稳定达到90%左右,且滤后水2-MIB稳定低于10 ng/L。【结论】通过以上措施可有效提升常规工艺对2-MIB的去除效率,出厂水能够达到国标限值以下。[Objective]In order to adapt to the limit value requirements of the Standards for Drinking Water Quality(GB 5749—2022)for 2-methyl isoethanol(2-MIB),improve the ability of conventional processes to remove 2-MIB[Methods]This paper studied the production measures of water treatment plants(WTPs)with conventional process to improve 2-MIB removal effect,and formed a set of full-process multi-stage barrier 2-MIB control technology routes suitable for WTPs with conventional processes,with the optimization of preoxidation,two-stage powder carbon adsorption and filter biodegradation as the core.[Results]Results showed that main measures to strengthen 2-MIB removal effect of the WTP with conventional process included optimizing the preoxidant,using potassium permanganate instead of sodium hypochlorite preoxidation,and the amount of potassium permanganate should not exceed 0.3 mg/L and the adsorption of powder activated carbon could significantly improve the 2-MIB removal effect.The water head built the powder carbon adding point and the adding device to realize the raw water+two-stage powder carbon in the WTP,prolong the powder carbon adsorption time;optimize and adjust the production and operation process in WTP(including stopping the use of sodium hypochlorite before filtration,backwashing without chlorine,prolong the filtration cycle,reduce the recoil strength,etc.),which could effectively improve the biodegradation effect of ordinary sand filter on 2-MIB.The culture cycle was about 4 months The stability reached about 90%,and 2-MIB of the water after filtration was stable below 10 ng/L.[Conclusion]Through the above measures,the removal efficiency of 2-MIB in the conventional process can be effectively improved,and the factory water can reach below the national standard limit.

关 键 词：常规工艺水厂 2-甲基异莰醇 预氧化 粉末活性炭 滤池生物降解 

分 类 号：TU991[建筑科学—市政工程]