煤化工废水除氟及尾水脱氮除磷性能  

Defluorination of coal chemical wastewater and nitrogen and phosphorus removal performance of tailwater

作　　者：张广瑞[1] 任彬 李海松[3] ZHANG Guang-rui;REN Bin;LI Hai-song(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou Zhengdong New District Water Affairs Co.,Ltd,Zhengzhou 450046,China;College of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学化工学院,河南郑州450001 [2]郑州市郑东新区水务有限公司,河南郑州450046 [3]郑州大学生态与环境学院,河南郑州450001

出　　处：《中国环境科学》2023年第4期1655-1662,共8页China Environmental Science

基　　金：河南省重大科技专项(201300311100)。

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/(m^(3)⋅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.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/(m^(3)·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.

关 键 词：煤化工废水 除氟 短程硝化 脱氮 反硝化除磷 

分 类 号：X52[环境科学与工程—环境工程]