关于垃圾填埋场渗滤液处理工艺的探讨

渗滤液的处理一直是生活垃圾填埋场存在的一大问题,尤其是新标准执行以来,对渗滤液的排放提出了更加严格的要求,因此处理工艺的选择成为达标排放的关键问题,本文中的“厌氧＋生化＋超滤＋纳滤＋反渗透”组合型渗滤液处理工艺能够确保污染物达标排放,并同时能满足处理后废水综合利用的要求。     

Removal of dissolved organic matter in municipal effluent with ozonation, slow sand filtration and nanofiltration as high quality pre-treatment option for artificial groundwater recharge

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 O₃/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.     

UF-RO-NF应用于电镀镍漂洗废水回用中试研究

采用“UF-RO-NF”中试装置处理电镀镍漂洗废水,在周期运行的工况下,考察其浓淡水回用效果以及膜通量变化情况。研究表明,该套系统淡水COD、Ni离子、电导率的平均值为70.6 mg/L、2.93 mg/L、91.1μs/cm^2,远低于该生产车间镀镍漂洗水,可以回用。浓水COD、Ni离子、电导率相对于漂洗水均有4倍以上的浓缩效果,具有一定的回用价值。整个系统在试验运行10个周期内膜通量保持不变。