Al<sup>3+</sup>对污泥自热高温微氧消化产酸及有机物释放的影响

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Abstract In order to exploit and use the organic matter in the fermentation liquid, the study added various dosage of AlCl₃•6H₂O to the sludge digestion system which using the technology of Autothermal Thermophilic Micro-Aerobic Digestion (ATMAD), the thesis discussed about the impacts of aluminum ions (Al³⁺) on transformation rule of organic substance, volatile fatty acid (VFA), ammonia nitrogen (NH₄⁺-N) and orthophosphate (PO₄^3--P) in the course of ATMAD. The results promoted that the conversion and degradation of organic substance was inhibited, meanwhile, the content and composition of dissolved organic substance in sludge digestion solution was changed when Al³⁺was existing in the system of ATMAD. The maximum production of VFA in contrast group was 6.9 multiple than experimental group with the concentration of Al³⁺ was 1.0g/L. When the process of ATMAD digestion ended, the concentration of NH₄⁺-N was 502.06mg/L in the reactor which the concentration of Al³⁺ was 1.0g/L, in the contrast group the concentration of NH₄⁺-N just was 334.41mg/L. The activity of microorganisms declined when Al³⁺ present in the system of ATMAD. It can be concluded that Al³⁺ have negative impacts on sludge digestion and stabilization. It's advisable to avoid adding excessive aluminum ions in sludge ATMAD system to ensure the digestion system can fully produce acid and release organic substance, which will be used as high-quality carbon for biological nitrogen removal.

Key words： digestion liquid of waste activated sludge organic substance ATMAD microorganisms aluminum ions (Al³⁺)

Received: 03 December 2022

PACS:

X703

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	Articles by authors
	LIU Yi-wei
	GAO Chun-di
	BI Hao-hua
	OU Jia-li
	XING Yi-yan
	PENG Yong-zhen

Cite this article:

LIU Yi-wei,GAO Chun-di,BI Hao-hua等. Effects of aluminum ions on acid production and organic substance release in waste activated sludge diges-tion by Autothermal Thermophilic Micro-Aerobic Digestion (ATMAD)[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3481-3488.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3481

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