School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne, 3001 Victoria, Australia.
School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne, 3001 Victoria, Australia.
J Hazard Mater. 2014 Feb 15;266:10-8. doi: 10.1016/j.jhazmat.2013.12.005. Epub 2013 Dec 12.
Disposal of reverse osmosis concentrate (ROC) is a growing concern due to potential health and ecological risks. Alum coagulation was investigated as pre-treatment for the UVC/H2O2 treatment of two high salinity ROC samples (ROC A and B) of comparable organic and inorganic content. Coagulation removed a greater fraction of the organic content for ROC B (29%) than ROC A (16%) which correlated well with the reductions of colour and A254. Although the total reductions after 60 min UVC/H2O2 treatment with and without coagulation were comparable, large differences in the trends of reduction were observed which were attributed to the different nature of the organic content (humic-like) of the samples as indicated by the LC-OCD analyses and different initial (5% and 16%) biodegradability. Coagulation and UVC/H2O2 treatment preferentially removed humic-like compounds which resulted in low reaction rates after UVC/H2O2 treatment of the coagulated samples. The improvement in biodegradability was greater (2-3-fold) during UVC/H2O2 treatment of the pre-treated samples than without pre-treatment. The target DOC residual (≤ 15 mg/L) was obtained after 30 and 20 min irradiation of pre-treated ROC A and ROC B with downstream biological treatment, corresponding to reductions of 55% and 62%, respectively.
反渗透浓缩液（ROC）的处理是一个日益受到关注的问题，因为其存在潜在的健康和生态风险。本研究采用铝盐混凝作为预处理方法，对两种高盐度 ROC 样品（ROC A 和 ROC B）进行了 UVC/H2O2 处理，这两种样品具有相似的有机和无机含量。混凝对 ROC B（29%）的有机成分去除率大于 ROC A（16%），这与色度和 A254 的降低情况很好地相关。尽管在有无混凝的情况下，经过 60 分钟 UVC/H2O2 处理后总去除率相当，但观察到还原趋势存在较大差异，这归因于样品中有机成分（类腐殖质）的不同性质，这一点通过 LC-OCD 分析得到了证实，以及不同的初始（5%和 16%）可生物降解性。混凝和 UVC/H2O2 处理优先去除类腐殖质化合物，导致混凝样品经过 UVC/H2O2 处理后的反应速率较低。预处理样品的生物可降解性提高了（2-3 倍），而未经预处理的样品则没有提高。经过下游生物处理，预处理的 ROC A 和 ROC B 的目标 DOC 残留（≤ 15 mg/L）分别在 30 分钟和 20 分钟的照射后达到，相应的去除率分别为 55%和 62%。
