Division of Environmental Science & Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, PR China.
Chemosphere. 2011 Apr;83(5):693-9. doi: 10.1016/j.chemosphere.2011.02.022. Epub 2011 Mar 5.
In the paper the combination process of ozonation, slow sand filtration (SSF) and nanofiltration (NF) was investigated with respect to dissolved organic matter (DOM) removal as high quality pre-treatment option for artificial groundwater recharge. With the help of ozonation leading to breakdown of the large organic molecules, SSF preferentially removes soluble microbial by-product-like substances and DOM with molecular weight (MW) less than 1.0 kDa. NF, however, removes aromatic, humic acid-like and fulvic acid-like substances efficiently and specially removes DOM with MW above 1.0 kDa. The residual DOM of the membrane permeate is dominated by small organics with MW 500 Da, which can be further reduced by the aquifer treatment, despite of the very low concentration. Consequently, the O(3)/SSF/NF system offers a complementary process in DOM removal. Dissolved organic carbon (DOC) and trihalomethane formation potential (THMFP) can be reduced from 6.5±1.1 to 0.7±0.3 mg L(-1) and from 267±24 to 52±6 μg L(-1), respectively. The very low DOC concentration of 0.6±0.2 mg L(-1) and THMFP of 44±4 μg L(-1) can be reached after the aquifer treatment.
在本文中，研究了臭氧化、慢砂过滤（SSF）和纳滤（NF）的组合工艺，以去除溶解有机物（DOM），作为人工地下水回灌的高质量预处理方法。臭氧化有助于大有机分子的分解，SSF 优先去除可溶性微生物副产物样物质和分子量（MW）小于 1.0 kDa 的 DOM。然而，NF 有效地去除芳香族、腐殖酸样和富里酸样物质，特别是去除 MW 大于 1.0 kDa 的 DOM。膜渗透物中的残留 DOM 主要由 MW 为 500 Da 的小分子有机物组成，尽管浓度非常低，但可以通过含水层处理进一步减少。因此，O(3)/SSF/NF 系统在 DOM 去除方面提供了一种互补的工艺。溶解有机碳（DOC）和三卤甲烷生成潜能（THMFP）可分别从 6.5±1.1 降至 0.7±0.3 mg/L 和从 267±24 降至 52±6 μg/L。经过含水层处理后，DOC 浓度可低至 0.6±0.2 mg/L，THMFP 可低至 44±4 μg/L。
