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《Journal of Zhejiang University(Engineering Science)》 2014-06
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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;  
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.
【Fund】: 国家水体污染控制与治理科技重大专项资助项目(2011ZX07301-004-03-02);; 教育部高等学校博士学科点专项科研基金资助项目(20110101120029);; 浙江省饮用水安全保障与城市水环境治理重点科技创新团队资助项目(2010R50037)
【CateGory Index】: TU992.2
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