中国科学院重庆绿色智能技术研究院机构知识库

QQ客服 官方微博 反馈留言

	Effect of working pressure of sludge-grit separator on properties of separated sludge
	Fan, Jian-Ping1; Ji, Fang-Ying1; Yan, Peng2; Yan, Da-Chao1
	2017
摘要	For wastewater treatment systems which do not have the primary settling tanks (PSTs), such as the oxidation ditch, or omit the PSTs in operation, developing fine grit/activated sludge separation technology has became a new technical route to improve MLVSS/MLSS value of activated sludge. As the working pressure reflected the energy consumption of sludge-grit separator directly, the effects of the working pressure of sludge-grit separator on the properties of separated sludge and performance of the separator were investigated to optimize the working pressure and achieve the efficient operation of sludge-grit separation system with energy saving. The results showed that the working pressure of 0.05 MPa to 0.2 MPa had significant effect on properties of separated sludge, and the separation degree of sludge-grit separator defined as the ratio of overflow sludge MLVSS/MLSS value to underflow sludge MLVSS/MLSS value was increased linearly with the working pressure. With the working pressure of 0.2 MPa to 0.4 MPa, the properties of separated sludge and the separation degree of separator were less influenced. Therefore, the working pressure should be controlled at 0.2 MPa. Under this condition, compared with that of feed sludge, MLVSS/MLSS value of overflow sludge raised by 13.8%, MLVSS/MLSS value of underflow sludge decreased by 31.5%, and the separation degree was 1.66, which indicated that biomass was collected in overflow sludge and fine grit was collected in underflow sludge. Moreover, compared with those of feed sludge, MLSS of underflow sludge increased by 1.73 times, and SVI and CST decreased by 66.9% and 48.3%, respectively, which showed that the thickening effect of underflow sludge was obvious, and the settleability and dewaterability of underflow sludge were improved significantly. © 2017, China Water and Wastewater Journal Editorial Office. All rights reserved.
发表期刊	China Water and Wastewater
ISSN	10004602
卷号	33期号:1页码:121-125
语种	中文