碱预处理耦合零价铁强化含油污泥厌氧消化

doi:10.16085/j.issn.1000-6613.2020-0434

摘要/Abstract

摘要：

含油污泥通常含较多的生物难降解性有机化合物，且污泥黏度大，乳化程度高，导致其厌氧消化潜力较低。污泥细胞破壁较慢，是污泥厌氧消化的限速步骤。本研究通过对含油污泥进行碱预处理，实现了污泥细胞破壁，并检测到胞内有机物质大量溶出，进而加快污泥水解为溶解态的小分子有机物，提高厌氧消化效率。另一方面，为了解决由预处理产生过量有机酸（如丙酸等）积累破坏厌氧系统内pH平衡的问题，本研究通过投加零价铁，促进丙酸等小分子向乙酸的转化，促进产甲烷，并最终使厌氧系统内pH保持平衡。研究结果表明：含油污泥经过碱预处理甲烷产量提高91.7%，同时污泥减量率提高了8%。碱预处理耦合零价铁粉，使得甲烷产量提高了105.4%，污泥减量率提高13%。进一步优化碱预处理pH条件，结果表明碱处理的最佳pH为9。

关键词: 含油污泥, 厌氧消化, 碱预处理, 零价铁

Abstract:

Oily sludge usually contains more bio-degradable organic compounds, and the sludge has a large viscosity and a high degree of emulsification, which leads to its low anaerobic digestion potential. Slow sludge cell wall breaking is a rate-limiting step for anaerobic digestion of sludge. In this study, by performing alkaline pretreatment of oily sludge, the wall of sludge cells was broken, and a large amount of dissolved organic matter was detected, which further accelerated the hydrolysis of sludge to dissolved small molecule organic matter and improved the efficiency of anaerobic digestion. On the other hand, in order to solve the problem of excessive organic acids (such as propionic acid) accumulating by pretreatment and destroying the pH balance in the anaerobic system, this study reduced the partial pressure of hydrogen in the anaerobic system by adding zero-valent iron, thereby promoting the conversion of small molecules such as propionic acid to acetic acid promotes methanogenesis and ultimately maintains the pH balance in the anaerobic system. The results of the study showed that the output of methane from oily sludge after alkaline pretreatment increased by 91.7%, while the sludge reduction rate increased by 8 percentage points. Alkaline pretreatment coupled with zero-valent iron powder increased methane production by 105.4% and sludge reduction rate by 13 percentage points. The pH conditions of alkali pretreatment were further optimized. The results showed that the optimal pH for alkali treatment was obtained at 9.

Key words: oily sludge, anaerobic digestion, alkali pretreatment, zero-valent iron

中图分类号:

王亭亭, 赵智强, 张耀斌. 碱预处理耦合零价铁强化含油污泥厌氧消化[J]. 化工进展, 2021, 40(1): 534-541.

Tingting WANG, Zhiqiang ZHAO, Yaobin ZHANG. Enhancement of anaerobic digestion of oily sludge by alkali pretreatment coupled with zero-valent iron[J]. Chemical Industry and Engineering Progress, 2021, 40(1): 534-541.

图/表 9

参考文献 20

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元素	结合能/eV	污泥表面元素的原子丰度/%
元素	结合能/eV	原始	碱处理
C 1s	284.80	72.12	74.21
	286.15	16.48	14.68
	288.50	11.40	11.11
O 1s	531.20	30.87	32.77
	532.00	28.39	28.22
	532.40	30.55	28.78
	533.70	10.19	10.23
P 2s	134.10	79.52	75.78
	133.10	20.48	24.22
N 1s	402.40	6.38	3.68
	399.60	44.18	46.22
	400.20	49.44	50.10

元素	结合能/eV	污泥表面元素的原子丰度/%
元素	结合能/eV	原始	碱处理
C 1s	284.80	72.12	74.21
	286.15	16.48	14.68
	288.50	11.40	11.11
O 1s	531.20	30.87	32.77
	532.00	28.39	28.22
	532.40	30.55	28.78
	533.70	10.19	10.23
P 2s	134.10	79.52	75.78
	133.10	20.48	24.22
N 1s	402.40	6.38	3.68
	399.60	44.18	46.22
	400.20	49.44	50.10

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