School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Water Sci Technol. 2012;66(5):1022-8. doi: 10.2166/wst.2012.277.
Construction solid waste (CSW), an inescapable by-product of the construction and demolition process, was used as main substrate in a four-stage vertical subsurface flow constructed wetland system to improve phosphorus P removal from domestic wastewater. A 'tidal flow' operation was also employed in the treatment system. Under a hydraulic loading rate (HLR) of 0.76 m3/m2 d for 1st and 3rd stage and HLR of 0.04 m3/m2 d for 2nd and 4th stage of the constructed wetland system respectively and tidal flow operation strategy, average removal efficiencies of 99.4% for P, 95.4% for ammoniacal-nitrogen, 56.5% for total nitrogen and 84.5% for total chemical oxygen demand were achieved during the operation period. The CSW-based constructed wetland system presents excellent P removal performance. The adoption of tidal flow strategy creates the aerobic/anoxic condition intermittently in the treatment system. This can achieve better oxygen transfer and hence lead to more complete nitrification and organic matter removal and enhanced denitrification. Overall, the CSW-based tidal flow constructed wetland system holds great promise for enabling high rate removal of P, ammoniacal-nitrogen and organic matter from domestic wastewater, and transforms CSW from a waste into a useful material.
建筑固体废物（CSW）是建筑和拆除过程中不可避免的副产品，被用作四级垂直潜流人工湿地系统的主要基质，以提高生活污水中的磷去除率。该处理系统还采用了潮汐流运行方式。在水力负荷率（HLR）分别为 0.76 m3/m2·d（第一和第三级）和 0.04 m3/m2·d（第二和第四级）的情况下，以及潮汐流运行策略下，人工湿地系统的磷去除率平均达到 99.4%，氨氮去除率达到 95.4%，总氮去除率达到 56.5%，总化学需氧量去除率达到 84.5%。基于 CSW 的人工湿地系统具有出色的磷去除性能。潮汐流策略的采用在处理系统中间歇性地创造了好氧/缺氧条件。这可以实现更好的氧气传递，从而导致更完全的硝化和有机物去除以及增强的反硝化。总的来说，基于 CSW 的潮汐流人工湿地系统有望实现从生活污水中高效去除磷、氨氮和有机物，并将 CSW 从废物转化为有用材料。
