Mg2+、Ca2+对厌氧消化系统中CO2的捕获和营养盐的回收

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Abstract

In order to explore the feasibility of simultaneous CO₂ sequestration and N/P nutrients recovery in sludge anaerobic digestion coupled with mineral carbonation, different ratios of Mg²⁺/Ca²⁺ were added in the anaerobic digestion systems with sludge hydrolysate as substrate, to investigate the performance of simultaneous CO₂ sequestration and nutrients removal. The results showed that the addition of Mg²⁺/Ca²⁺ of (20mmol/L)/(0mmol/L), (10mmol/L)/(10mmol/L) and (0mmol/L)/(20mmol/L) could promote the degradation of organic matters, so that the biogas production increased by 16.97%, 21.56% and 23.99%, and the CO₂ content was reduced from 27.27% to 24.81%, 22.06% and 21.98%, respectively. The phosphate concentration was reduced by 63.46%~66.47% with Mg²⁺/Ca²⁺ addition of different ratios. However, ammonia nitrogen concentration was reduced only in the digesters with Mg²⁺/Ca²⁺ added at (20mmol/L)/(0mmol/L) and (10mmol/L)/(10mmol/L). XRD analysis revealed that struvite and magnesium carbonate, struvite and calcite, calcite and monetite were respectively formed in the digesters with Mg²⁺/Ca²⁺ added at (20mmol/L)/(0mmol/L), (10mmol/L)/(10mmol/L) and (0mmol/L)/(20mmol/L). The combined addition of Mg²⁺/Ca²⁺ in equimolar amount achieved the best simultaneous CO₂ sequestration and N/P nutrients recovery.

Key words： sludge anaerobic digestion mineral carbonation CO₂ sequestraion nutrients recovery

Received: 12 December 2018

PACS:

X703

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	Articles by authors
	GONG Lin-lin
	ZHANG Yan
	JIANG Qian-qian
	CUI Min-hua
	LIU He
	ZHANG Jie

Cite this article:

GONG Lin-lin,ZHANG Yan,JIANG Qian-qian等. CO₂ sequestration and nutrients recovery in anaerobic digestion with Mg²⁺ and Ca²⁺ addition[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2804-2811.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2804

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