Impacts of biological activities on erosion of sewer sediments
Impacts of biological activities on erosion of sewer sediments
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DOI：
10.1680/wama.14.00134
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Yongchao Zhou;Yan Ma;Lei Fang;Yiping Guo
中科院分区：
文献类型：
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作者：
Yongchao Zhou;Yan Ma;Lei Fang;Yiping Guo
通过实验研究，探讨了生物过程对富有机物下水道沉积物侵蚀行为的影响。结果表明，生物活动使沉积物膨胀，使其容重降低。实验结果还表明，下水道泥沙侵蚀是一个非常复杂的过程，受重力固结和生物稳定作用的影响。好氧生物过程可以削弱沉积物床，并影响富含挥发性固体的沉积物的侵蚀模式，而相同的过程可以增加挥发性固体含量较低的沉积物的抗侵蚀能力。在厌氧条件下，由于生物活性的作用，会形成两种具有不同物理性质和抗侵蚀能力的沉积层。然而，在低温和有氧条件下，重力固结被确定为控制沉积物侵蚀行为的主要因素。
Experimental studies were conducted to investigate the influences of biological processes on the erosion behaviour of organic-rich sanitary sewer sediments. The results show that biological activities can make sediments expand and their bulk densities decrease. The experimental results also illustrate that sewer sediment erosion is a very complex process influenced by gravitational consolidation and biostabilisation. Aerobic biological processes can weaken a sediment bed and affect the erosion patterns for sediments rich in volatile solids, whereas the same processes can increase the resistance to erosion of sediments with lower volatile solid contents. Under anaerobic conditions, two sediment layers with different physical properties and erosion-resistance capabilities would form as a result of biological activities. Under low temperature and aerobic conditions, however, gravitational consolidation was identified as the major factor controlling the erosion behaviour of sediments.