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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
    
Erosion characteristics of sewer sediment with biological actions
SHAO Wei-yun, MA Yan, ZHOU Yong-chao, DU Xu, GUAN Yao
College of Civil Engineering and Architecture. Zhejiang University, Hangzhou 310058, China
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Abstract  

The erosion behavior of organic-riched sewer sediment was investigated in laboratory experiments by controlling series conditions of different temperature, dissolved oxygen (DO) and incubation time. Results show that biological activities can affect sewer sediment erosion behavior in two ways. Anti-erosion ability is weaken due to the decrease of bulk density, whereas, biofilm which was developed during biological process can enhance the sediment anti-erosion ability. During the tests with high DO and normal temperature (25 ℃), the bulk density at various depths decreased to various degrees due to obvious biological effects. On the contrary, an increase of the bulk density was observed during the experiment under the condition of anaerobic and low temperature(5 ℃). Besides, compared with  5 ℃ and anaerobic conditions, aerobic condition with 25 ℃ promoted the development of biofilm on the sediment surface, which can enhance significantly the anti-erosion ability of sediment.

Published: 01 April 2015
CLC:  TU 992.3  
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SHAO Wei-yun, MA Yan, ZHOU Yong-chao, DU Xu, GUAN Yao. Erosion characteristics of sewer sediment with biological actions. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 48(6): 1075-1079.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.06.015     OR     http://www.zjujournals.com/eng/Y2014/V48/I6/1075


生物作用下排水管道沉积物的冲蚀特性

 通过在实验室内控制不同的温度、溶解氧环境以及培养时间,探究排水管道内高有机物含量的沉积物在生物作用下的冲蚀特性和规律.结果表明: 生物作用对高有机性沉积物的冲蚀特性的影响可表现为两方面：一是影响沉积物堆积密度使其内部结构松散从而削弱其抗冲蚀能力；二是在沉积物表面形成生物膜层从而使其抗冲蚀能力得到增强.在常温(25℃)好氧工况下,由于生物作用较为活跃,沉积物不同深度处的堆积密度随培养时间的增加有不同程度的减小,而在低温(5℃)和厌氧条件下沉积物密度则随培养时间的增加而增大.此外,相对于5℃和厌氧工况,25℃好氧条件更有利于沉积物表面生物膜层的发展,从而提高沉积物的抗冲蚀能力.

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