MBBR工艺中SNEDPR的启动及性能研究

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Abstract This study assessed the feasibility of simultaneous nitrification, endogenous denitrification and phosphorus removal (SNEDPR) for enhancing the nitrogen and phosphorus removal by the process of moving bed biofilm reactor (MBBR), an MBBR operated alternately by continuous aeration and stirring/aeration was adopted for simulating the treatment of domestic sewage with magnetic filler as the carrier. The performance of nitrogen and phosphorus removal during SNEDPR initiation was investigated, and the structural changes of functional microflorae were analyzed by fluorescence microscopy and high-throughput sequencing technology. The results showed that after two stages of operation, the removal rates of ammonia nitrogen and phosphorus reached 97.6% and 85.37% respectively, and the NO₂^--N, NO₃^--N and COD concentrations in the effluent were 1.3949, 3.88 and 20.4mg/L respectively. The simultaneous nitrification and endogenous denitrification rate (SNEDR) increased from 0.07% to 86.35%. The improvement in SNEDR at the aerobic stage decreased the NO_x^--N concentration in the effluent, improved the denitrification performance of the system and promoted the storage capacity of carbon source at the anaerobic stage. The fluorescence microscopy and high-throughput sequencing results showed that after 53d of operation, the diversity of microbial community was improved significantly, and at the same time, the increase in abundance for GAOs, AOB and NOB (from 3.3%, 0.84% and 0.66% in the inoculated sludge to 27.08%/20.48%, 1.45%/1.76% and 1.05%/0.85% in the system respectively) and the presence of PAOs and DPAOs guaranteed the performance of nitrogen and phosphorus removal for the system, and realized the coupling of EBPR and SNED by the MBBR process.

Key words： simultaneous nitrification-endogenous denitrification (SNED) moving bed biofilm reactor enhanced biological phosphorous removal phosphorous accumulating organisms (PAOs) high-throughput sequencing

Received: 16 December 2022

PACS:

X703.1

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	Articles by authors
	JING Shuang-yi
	SONG Zi-yang
	LIU Chao
	LI Wei-ping
	LI Qi
	ZHANG Tie-jun

Cite this article:

JING Shuang-yi,SONG Zi-yang,LIU Chao等. Start-up and performance study on the simultaneous nitrification-endogenous denitrification phosphorus removal (SNEDPR) in the biological process of the moving bed biofilm reactor (MBBR)[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3121-3129.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3121

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