添加剂对污泥堆肥过程中气体排放和酶活性的影响

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Abstract In response to the issue of elevated greenhouse gas emissions and nitrogen loss during the conventional co-composting of municipal sludge and straw blends, the combined addition of corn straw biochar (CSB) and coal gangue-based zeolite (ZL) was employed. To mitigate emissions of CH₄, NH₃ and N₂O during the composting process, 10% CSB was mixed with varying proportions of ZL (0%, 10%, 20% and 30%) based on the mass ratio of additives to the sludge and corn straw mixture. Meanwhile, an untreated control group was concurrently maintained. The findings revealed that the co-application of CSB and ZL (marked as 10%CSB+ZL) led to a significant augmentation in composting temperature and pH value in comparison to the control. This enhancement facilitated enhanced degradation of organic matter within the compost, with the degradation rates surpassing those observed in both the control group and 10%CSB treatment. The simultaneous application of these two addition agents yielded a reduction in the nitrogen loss during the composting process. Compared with the control, the cumulative emission of CH₄, NH₃ and N₂O in the 10%CSB+10%ZL, 10%CSB+20%ZL, 10%CSB+30%ZL treatments decreased by percentages ranging from 87.81% to 90.87%、41.61% to 57.45%、85.01% to 94.92%, respectively, The cumulative emission of CO₂ in these treatments exhibited a substantial increase, ranging from 55.45% to 86.55% relative to the control. Furthermore, enzymatic activities, including dehydrogenase, protease, xylanase and phosphatise, experienced augmentation during the composting process. Biochar functioned as a bulking agent, increasing compost porosity to stimulate microbial growth and bolster related enzymatic activities. Coal gangue-based zeolite contributed to gas emission reduction through an adsorption mechanism. The 10%CSB+20%ZL treatment emerged as the most effective strategy in decreasing nitrogen losses, primarily by curtailing the emission rates of CH₄, NH₃ and N₂O during the composting process.

Key words： dewatered sewage sludge corn straw compost biochar coal gangue based zeolite nitrogen retention

Received: 13 March 2023

PACS:

X703.5

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	Articles by authors
	GE Qi-long
	WANG Guo-ying
	HOU Rui
	ZHANG Jing

Cite this article:

GE Qi-long,WANG Guo-ying,HOU Rui等. Effects of the additives on gas emission and enzyme activities during sludge composting[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5873-5883.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5873

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