The degradation processes of refractory substances in nanofiltration concentrated leachate using micro-ozonation.
The degradation processes of refractory substances in nanofiltration concentrated leachate using micro-ozonation.
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DOI：
10.1016/j.wasman.2017.08.048
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发表时间：
2017-11
期刊：
影响因子：
8.1
通讯作者：
Hui Wang;Yunhai Wang;Z. Lou;N. Zhu;Haiping Yuan
中科院分区：
文献类型：
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作者：
Hui Wang;Yunhai Wang;Z. Lou;N. Zhu;Haiping Yuan
渗滤液浓缩液是渗滤液生物处理后经膜分离装置处理后的副产物，含有大量的类腐殖酸物质。本研究采用臭氧氧化法对废水中难降解物质进行进一步的去除。微气泡臭氧氧化（MB-O3）的效果最好，在臭氧投加量为2.4 g/L、初始pH为9、反应时间为120 min的条件下，COD和TOC的去除率分别为76.0%和69.9%。MB-O3中的反应速率k为0.0104 min-1，是普通O3中的3倍。腐殖酸和富里酸在CL中所占的百分比分别从24.1%下降到14.3%和49.6%下降到25.0%，而HyI物质从26.3%上升到60.7%，并且在<2000 Da的组分中也发现了这一现象，所占百分比从0上升到63.0%。在Em/Ex 475/390 ~ 410/325 nm范围内，类胡敏酸物质发生了连续的蓝移，可能是由于类胡敏酸物质发生了羰基和羧基的转化。MB-O3有望成为CL的深度治疗方法。
Concentrated leachate (CL) is the byproduct of leachate treated by the membrane separation unit after bio-treatment processes, and contains many humic-like substances. Ozonation processes were applied and optimized for the further removal of those refractory matters in this work. Micro-bubble ozonation (MB-O3) possessed the best performance, and 76.0% and 69.9% of COD and TOC were found to be removed under the optimum conditions with ozone dosage of 2.4 g/L, initial pH of 9 and reaction time of 120 min. The reaction rate k in MB-O3was 0.0104 min−1, three times higher than that in normal O3. The percentages of humic acid and fulvic acid in CL decreased from 24.1% to 14.3% and 49.6% to 25.0%, while that of HyI substances increased from 26.3% to 60.7%, which was also found in the fraction of <2000 Da, with the occupied percentage increased from 0 to 63.0%. The humic acid-like substances might be transformed to matters with carbonyl and carboxyl group, since a continuous blue-shift was observed from Em/Ex 475/390 to 410/325 nm. MB-O3could be a promising method for the advanced treatment of CL.