在现场的液处理设施能否有效地解决液中 perfluoroalkyl 酸 (PFAA) 的问题?
Chu Tang1, Lingyue Zhang2, Hongxin Li1
1School of Environment, Tsinghua University, Beijing 100084, China.
The Science of the total environment
|May 5, 2024
概括
这项研究评估了漏液中 perfluoroalkyl 酸 (PFAA) 的先进废水处理. 纳米过和反透有效地去除了PFAA,而无氧/有氧处理显示出有限的容量.
科学领域:
- 环境科学 环境科学
- 环境化学环境化学
- 水处理工程水处理工程
背景情况:
- perfluoroalkyl酸 (PFAA) 是常见的有机污染物,在城市固体废物中发现.
- 液中高度的PFAA对废水处理厂 (WWTP) 和环境构成风险.
- 目前的现场液处理厂 (LTP) 面临着高的PFAA加载率.
研究的目的:
- 评估"无氧/有氧 (A/O) +膜生物反应器 (MBR) +纳米过 (NF) +反透 (RO) "配置在液中去除PFAA的有效性.
- 在10个现场LTP中分析不同处理阶段的PFAA去除效率.
- 调查垃圾填埋场年龄和PFAA链长度对移除率的影响.
主要方法:
- 从现场的10个具有相同处理配置的LTP中取样和分析原始和经过处理的浸出液.
- 通过每个处理过程 (A/O,MBR,NF,RO) 进行PFAA去除的综合性质量流分析.
- 相关性分析以确定影响PFAA去除的因素,包括PFAA链的长度和填埋场的年龄.
主要成果:
- 在A/O处理阶段,PFAA的去除能力有限.
- 纳米过 (NF) 实现了总PFAA (PFAA) 的清除率为77.44%.
- 反透 (RO) 证明了PFAA的高去除率为94.30%.
- 经常检测到短链PFAA,并在水相中分散.
- 与短链变种相比,现场LTP显示了长链PFAA的更高的去除效率.
结论:
- "A/O + MBR + NF + RO"处理配置有效地从城市固体废物水中去除PFAA,特别是NF和RO阶段.
- 短链PFAA由于分散而构成挑战,而长链PFAA则通过当前的系统更有效地去除.
- 可能需要进一步优化,以加强在液处理过程中去除短链PFAA.
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