煤化工废水除氟及尾水脱氮除磷性能

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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

Received: 04 August 2022

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X52

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	ZHANG Guang-rui
	REN Bin
	LI Hai-song

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ZHANG Guang-rui,REN Bin,LI Hai-song. Defluorination of coal chemical wastewater and nitrogen and phosphorus removal performance of tailwater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1655-1662.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1655

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