酸化联合钢渣催化过硫酸盐预处理对污泥脱水性能的影响研究

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Abstract The acidification combined with steel slag-catalytic persulfate (PS) pretreatment technology was applied to sludge conditioning and the sludge dewatering performance was investigated by the single-factor experiment. The optimal pretreatment conditions for sludge were temperature of 25℃, pH 3, mixing time of 30min, and dosing levels of 100mg/g TS and 280mg/g TS for steel slag and PS, respectively, the sludge specific resistance and sludge cake water content decreased from 9.23×10¹²m/kg and 85% of the raw sludge to 1.89×10¹²m/kg and 77% respectively. Fourier transform infrared spectroscopy, three-dimensional fluorescence spectroscopy, polysaccharide, protein and free radicals quenching experiments were characterizated mechanism for steel slag-catalytic PS pretreatment promoting sludge dewatering performance: The SO₄⁻• and •OH generated by slag-catalytic PS can destroy the sludge extracellular polymeric substances and biological cell structure, thereby reducing the content of hydrophilic functional groups and promoting the release of bound water.

Key words： acidification steel slag persulfate sludge dewatering free radicals

Received: 12 December 2022

PACS:

X703

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	LI Wen-xiu
	SONG Xiu-lan
	WU Yu-qi

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LI Wen-xiu,SONG Xiu-lan,WU Yu-qi. Effect of pretreatment though acidification combined with persulfate catalyzed by steel slag on dewaterability of sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3509-3517.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3509

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