PAC强化饮用水常规工艺去除2-MIB的优化及应用
Optimization and application of powdered activated carbon enhanced for removal of 2-methylisoborneol in conventional drinking water treatment processes
刘岳峰 1邵志昌 1李土雄 1潘博伦 1李抄 1刘叶芳 1刘丽君2
作者信息
- 1. 深圳市深水宝安水务集团有限公司,深圳 518133
- 2. 深圳市环境水务集团有限公司,深圳 518031
- 折叠
摘要
《生活饮用水卫生标准》(GB 5749-2022)中将2-甲基异莰醇(2-MIB)调整为水质扩展指标,限值为10 ng/L,并于2023年4月1日正式实施.为确保出水水质满足新国标要求,S水厂开展了去除2-MIB的生产试验.试验表明,常规工艺水厂通过强化生物作用可削减12～15 ng/L的2-MIB,但原水2-MIB大于25 ng/L时,需投加粉末活性炭强化去除2-MIB.恒温吸附试验结果表明,同时满足碘值≥950 mg/g和亚甲基蓝值≥190 mg/g的粉末活性炭对2-MIB吸附效果明显;粉末活性炭吸附效率随着一次性投加量的增加而降低,在总投加量50、40和30 mg/L时,多点投加方式相比于原水单点投加能分别提升18.4％、15.3％和39.6％;为解决多点投加特别是滤前投加对浊度的影响,应选择粒径集中在200～400目的粉末活性炭,且粒径小于400目的比例应小于5％.
Abstract
The Standards for drinking water quality(GB 5749-2022)has adjusted 2-methyl-isoborneol(2-MIB)to an extended water quality indicator with a limit value of 10 ng/L,which was officially implemented on April 1,2023.To ensure that the effluent quality meets the new national standards,production tests for the removal of 2-MIB carried out in S Water Plant.It shows that conventional water treatment plants can reduce 2-MIB by 12-15 ng/L through enhanced biological action,but when the raw water 2-MIB exceeds 25 ng/L,Powdered activated carbon needs to be added to enhance the removal of 2-MIB.The results of the isothermal adsorption test indicate that powdered activated carbon meeting both an iodine value of ≥950 mg/g and a methylene blue value of ≥190 mg/g exhibits a significant adsorption effect on 2-MIB;the adsorption efficiency of pow-dered activated carbon decreases with the increase of the one-time addition amount.When the total addition amounts are 50、40、and 30 mg/L,the multi-point addition method can improve the adsorp-tion by 18.4％,15.3％,and 39.6％respectively compared to the single-point addition in raw wa-ter.To solve the impact of multi-point addition,especially pre-filtration addition,on turbidity,powdered activated carbon with a particle size concentrated between 200 to 400 mesh should be se-lected,and the proportion of particles smaller than 400 mesh should be less than 5％.
关键词
2-甲基异莰醇/粉末活性炭/饮用水/应急处理Key words
2-methylisoborneol/Powdered activated carbon/Drinking water/Emergency treat-ment引用本文复制引用
出版年
2024
NETL
NSTL
万方数据