Clogging processes caused by biofilm growth and organic particle accumulation in lab-scale vertical flow constructed wetlands.
Clogging processes caused by biofilm growth and organic particle accumulation in lab-scale vertical flow constructed wetlands.
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DOI：
10.1016/s1001-0742(08)62336-0
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发表时间：
2009
影响因子：
6.9
通讯作者：
Lianfang Zhao;Wei Zhu;Wei Tong
中科院分区：
文献类型：
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作者：
Lianfang Zhao;Wei Zhu;Wei Tong
有机物在基质孔隙中的积累是造成潜流人工湿地堵塞的重要因素。以葡萄糖（溶解性有机物）和淀粉（颗粒性有机物）为进水，研究了两组实验室垂直流人工湿地（VFCWs）中生物膜生长或有机颗粒积累而非总有机物积累引起的堵塞发展过程。结果表明，基质孔隙中生物膜的生长确实会导致有效孔隙率显著降低，尤其是对于强有机废水，但对入渗速率的影响很小。这表明，生物膜生长对堵塞的最重要贡献是加速堵塞的发生。与生物膜生长相比，除有效孔隙率外，孔隙内颗粒物的积累也会迅速降低入渗速率，堵塞主要发生在0-15 cm的上层。在有机物积累量大致相等的情况下，淀粉系统堵塞层的有效孔隙度远小于葡萄糖系统，说明除有机物积累量外，组成和积累方式也是造成堵塞的重要因素。
The accumulation of organic matter in substratum pores is regarded as an important factor causing clogging separately in the subsurface flow constructed wetlands. In this study, the developing process of clogging caused by biofilm growth or organic particle accumulation instead of total organic matter accumulation was investigated in two groups of lab-scale vertical flow constructed wetlands (VFCWs), which were fed with glucose (dissolved organic matter) and starch (particulate organic matter) influent. Results showed that the growth of biofilms within the substratum pores certainly caused remarkable reduction of effective porosity, especially for the strong organic wastewater, whereas its influence on infiltration rate was negligible. It was implied that the most important contribution of biofilm growth to clogging was accelerating the occurrence of clogging. In comparison with biofilm growth, particles accumulation within pores could rapidly reduce infiltration rate besides effective porosity and the clogging occurred in the upper 0–15 cm layer. With approximately equal amount of accumulated organic matter, the effective porosity of the clogged layer in starch-fed systems was far less than that of glucose-fed systems, which indicated that composition and accumulation mode in addition to the amount of the accumulated organic matter played an important role in causing clogging.