玉米秸秆生物炭改善污泥脱水性能

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Abstract Biochar and AlCl₃-modified biochar were prepared by using corn stalks as materials to enhance the dewatering of the sludge. The performances of these two biochar for the enhancement of the dewatering of the sludge and possible enhancing mechanisms were discussed. Results showed that SRF, MC, SV₃₀ and CST of the sludge were decreased and Y_N was increased after conditioned by the two biochar, indicating higher sludge dewaterability. Furthermore, dewatering of the sludge conditioned by the AlCl₃-modified biochar was significantly better than that conditioned by the biochar that without modification. Especially, when the dosage of the biochar modified by 3mol/L of AlCl₃ solution was adjusted to 3g/L, SRF, MC, SV₃₀ and CST were decreased to 1.3×10¹²m/kg, 81.9%, 78.6% and 35s, respectively, Y_N was increased to 17.8kg/(m²·h). For the enhancing mechanism, on the one hand, after conditioned by the biochar, certain skeleton structures were formed in sludge cake to make water cut across easily by decreasing the sludge EPS; on the other hand, charge neutralization occurred when the AlCl₃-modified biochar (loaded with positively charged aluminum species on its surface) was dosed into the sludge system, thus destroying the stable sludge colloidal system, thus far easier to congregate the sludge particles, which enhanced the dewatering of the sludge.

Key words： aluminum chloride (AlCl₃) corn stalks biochar sludge dewatering

Received: 28 January 2019

PACS:

X703.1

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	Articles by authors
	GUO Jun-yuan
	WEN Xiao-ying
	YANG Run-jin
	LIN Yue
	LAI Yu-long
	ZHOU Yu-yu
	YANG Hong

Cite this article:

GUO Jun-yuan,WEN Xiao-ying,YANG Run-jin等. Preparation of corn stalks biochar and improvement of dewatering performance of sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3316-3322.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3316

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