溶解氧对单级颗粒污泥自养脱氮系统影响的模拟

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Abstract

The effect of dissolved oxygen (DO) on single-stage granular sludge autotrophic denitrification in a sequencing batch reactor system was evaluated through coupling of mass transfer process of granule sludge, vegetation processes of ammonia oxidizing bacteria (AOB), aerobic ammonia-oxidizing bacteria (AAOB), nitrite-oxidizing bacteria (NOB) and denitrifying bacteria, and endogenous respiration processes of aerobic and anoxic bacteria. A kinetic model of autotrophic denitrification granular sludge was developed based on activated sludge model 3 (ASM3) and the shortcut nitrification-nitrification-denitrification model, and subsequently the substrate concentration distribution within granular sludge was predicted. The results showed the ratio of aerobic zone to anoxic zone in granular sludge decreased from 3:1 to 0.4:1 when DO concentration decreased from 0.6mg/L to 0.4mg/L. Based on the matrix reaction rate equation, a system kinetic model of granular sludge single-stage autotrophic nitrogen removal was developed to predict system performance. The predicted result of total nitrogen removal rate (89%) was slightly lower than the actual measured removal rate (95%).

Key words： single-stage autotrophic nitrogen removal granule sludge DO kinetic model

Received: 06 June 2019

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X703

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	Articles by authors
	LI Bo-lin
	REN Xiao-ling
	LI-Ye
	WANG-Yue
	WANG-Wei
	LIANG Ya-nan

Cite this article:

LI Bo-lin,REN Xiao-ling,LI-Ye等. Simulation study on the effect of dissolved oxygenon single-stage granular sludge autotrophic nitrogen removal system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5126-5133.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I12/5126

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