煤化工废水除氟及尾水脱氮除磷性能

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摘要为了实现将水体中F^-浓度降至1mg/L以下的目标,采用多步除氟法,优化药剂投加顺序及剂量控制成本.对除氟尾水进行脱氮除磷处理,并利用16S rRNA高通量测序技术分析微生物群落结构.结果表明,在最优除氟方案下能将F^-浓度从119.73~138.56mg/L降至0.33mg/L,除氟成本为6.13元/t.除氟尾水的硝化和反硝化负荷分别达到0.12和0.13kg/(m³×d).硝化过程从批次八实现稳定的短程硝化,平均亚硝酸盐积累率(NAR)>80%,这由前期游离氨(FA)抑制和后期游离亚硝酸(FNA)抑制造成.脱氮过程中观察到反硝化除磷作用,磷的吸收率可达到84.10%~89.75%.高通量测序结果表明,经过20个批次的驯化,污泥微生物群落结构发生显著变化.驯化污泥中好氧反硝化菌(Paracoccus和Pseudomonas)、异养反硝化菌(Flavobacterium和Thauera)和反硝化聚磷菌(Paracoccus、Pseudomonas和Thauera)得到富集.

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	张广瑞
	任彬
	李海松

关键词 ：煤化工废水, 除氟, 短程硝化, 脱氮, 反硝化除磷

Abstract：The multi-step defluorination process was used to optimize the dosing sequence and dosage control cost in order to reduce the concentration of F^- in water to below 1mg/L. High-throughput sequencing of the 16S rRNA gene was used to examine the microbial community structure after nitrogen and phosphorus were removed from the defluorination tailwater. Based on the optimized defluorination scheme, F^- concentration could decline from 119.73~138.56mg/L to 0.33mg/L with the defluorination cost of 6.13yuan/t. The nitrification and denitrification loads of defluorination tailwater reached to 0.12 and 0.13kg/(m³·d), respectively. The nitrification process achieved stable shortcut nitrification from the eighth batch with an average nitrite accumulation rate (NAR) >80%. This was due to the early free ammonia (FA) and late free nitrite (FNA) inhibitions. Denitrifying phosphorus removal was seen during the denitrification process, and the phosphorus absorption rate ranged from 84.10% to 89.75%. The result of high-throughput sequencing demonstrated the great change of microbial community structure had a great shift after 20 batches of domestication. The abundance of aerobic denitrifying bacteria (Paracoccus and Pseudomonas), heterotrophic denitrifying bacteria (Flavobacterium and Thauera), and denitrifying phosphorus accumulating bacteria (Paracoccus, Pseudomonas and Thauera) were enriched in acclimation sludge.

Key words： coal chemical wastewater fluoride removal shortcut nitrification denitrification denitrifying phosphorus removal

收稿日期: 2022-08-04

PACS:

X52

基金资助:河南省重大科技专项(201300311100)

通讯作者: 李海松,教授,lhs@zzu.edu.cn E-mail: lhs@zzu.edu.cn

作者简介: 张广瑞(1981-),男,河南新乡人,高级工程师,在职博士,主要从事煤气化及其下游产品的技术研究.发表论文20余篇.15090402941@163.com.

引用本文:

张广瑞, 任彬, 李海松. 煤化工废水除氟及尾水脱氮除磷性能[J]. 中国环境科学, 2023, 43(4): 1655-1662. ZHANG Guang-rui, REN Bin, LI Hai-song. Defluorination of coal chemical wastewater and nitrogen and phosphorus removal performance of tailwater. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1655-1662.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I4/1655

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