旋流式壅塞空化破解剩余污泥的试验研究  

Experimental Study of Swirling Choked Cavitation for Excess Sludge Breakdown

作　　者：张凤华[1] 蒋浩[1] 唐川林[1] 李春华 骆航成 

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412007 [2]株洲首创水务有限责任公司,湖南株洲412000

出　　处：《中国给水排水》2017年第23期98-103,共6页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51374101);湖南省自然科学株洲联合基金资助项目(2015JJ5014)

摘　　要：基于壅塞空化和旋转射流理论提出了一种新型水力空化器——旋流式壅塞空化器,搭建了旋流式壅塞空化破解剩余污泥的循环试验系统,分析了旋流芯长度、背压和循环次数等对污泥破解的影响。结果表明,旋流式壅塞空化器可有效提高空化强度、破解污泥絮体和微生物细胞壁所需的机械剪切效应,实现了高效破解剩余污泥。适宜的旋流芯长度和相应的背压,可使旋流式壅塞空化技术破解剩余污泥效果达到最佳。在旋流芯长度为3/4倍导程、背压为89 k Pa的条件下,循环处理20次后SCOD溶出率达到16.51%。研究成果为剩余污泥减量化提供了一种新途径。Based on the theory of choked cavitation and swirling jet, an innovative hydrodynamic cavitation device driven by a swirling-jet was proposed. Through the development of the experimental cy- cle system of swirling choked cavitation for sludge breakdown, the effect of the length of swirling core, the back pressure, and the number of cycles were investigated. The results showed that the swirling choked cavitation effectively improved the cavitation intensity and enhanced the mechanical shear effects to separate the floc and microbial cell wall in the sludge, which accomplished efficient breakdown of ex- cess sludge. Suitable swirling core length and back pressure could facilitate achieving the best results of excess sludge breakdown. When the length of swirling core was 3/4 of the lead, and the back pressure was 89 kPa, the dissolving rate of SCOD was up to 16.51% after 20 cycles. The research results provid- ed an innovative method for the reduction of excess sludge.

关 键 词：壅塞空化 剩余污泥 污泥破解 SCOD 旋转射流 

分 类 号：X703[环境科学与工程—环境工程]