Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
J Environ Sci (China). 2018 Mar;65:253-261. doi: 10.1016/j.jes.2017.01.015. Epub 2017 Mar 8.
In this study, direct contact membrane distillation (DCMD) was used for treating fermentation wastewater with high organic concentrations. DCMD performance characteristics including permeate flux, permeate water quality as well as membrane fouling were investigated systematically. Experimental results showed that, after 12hr DCMD, the feed wastewater was concentrated by about a factor of 3.7 on a volumetric basis, with the permeate flux decreasing from the initial 8.7L/m/hr to the final 4.3L/m/hr due to membrane fouling; the protein concentration in the feed wastewater was increased by about 3.5 times and achieved a value of 6178mg/L, which is suitable for reutilization. Although COD and TOC in permeate water increased continuously due to the transfer of volatile components from wastewater, organic rejection of over 95% was achieved in wastewater. GC-MS results suggested that the fermentation wastewater contained 128 kinds of organics, in which 14 organics dominated. After 12hr DCMD, not only volatile organics including trimethyl pyrazine, 2-acetyl pyrrole, phenethyl alcohol and phenylacetic acid, but also non-volatile dibutyl phthalate was detected in permeate water due to membrane wetting. FT-IR and SEM-EDS results indicated that the deposits formed on the membrane inner surface mainly consisted of Ca, Mg, and amine, carboxylic acid and aromatic groups. The fouled membrane could be recovered, as most of the deposits could be removed using a HCl/NaOH chemical cleaning method.
在这项研究中，采用直接接触式膜蒸馏（DCMD）处理高浓度有机发酵废水。系统研究了 DCMD 的性能特点，包括渗透通量、渗透水质和膜污染。实验结果表明，经过 12 小时的 DCMD 处理，进料废水在体积上浓缩了约 3.7 倍，由于膜污染，渗透通量从初始的 8.7L/m/hr 下降到最终的 4.3L/m/hr；进料废水中的蛋白质浓度增加了约 3.5 倍，达到 6178mg/L，适合再利用。尽管由于挥发性成分从废水中转移，渗透水中的 COD 和 TOC 不断增加，但废水中的有机物去除率超过 95%。GC-MS 结果表明，发酵废水中含有 128 种有机物，其中 14 种有机物占主导地位。经过 12 小时的 DCMD 处理，由于膜润湿，不仅在渗透水中检测到挥发性有机物，如三甲吡嗪、2-乙酰吡咯、苯乙醇和苯乙酸，而且还检测到非挥发性邻苯二甲酸二丁酯。FT-IR 和 SEM-EDS 结果表明，膜内表面形成的沉积物主要由钙、镁以及胺、羧酸和芳香族基团组成。污染的膜可以通过 HCl/NaOH 化学清洗方法回收，因为大部分沉积物可以去除。
