Abstract
Abstract Purifying initial surface runoff is one of the most important measures to improve water quality and recreation value of water bodies in an urbanized area such as Moshui Lake. Two types of combined pond–wetland systems were constructed to store and treat the initial urban surface runoff together with the combined sewer overflow in rainy season and the diluted municipal wastewater or the Moshui Lake water in dry season. After one year, the deposition pond–landscape pond–vertical flow constructed wetland (VFCW)–horizontal flow subsurface constructed wetland (HFCW) system was more effective than the deposition pond–HFCW system in removing chemical oxygen demand (COD), total phosphorous (TP), total nitrogen (TN), and suspended solids (SS). After being treated by the deposition pond–landscape pond–VFCW–HFCW system, the initial influent containing COD 161.0 ± 28.4 mg L−1, TP 2.65 ± 0.27 mg L−1, TN 23.21 ± 2.04 mg L−1, and SS 531.2 ± 56.2 mg L−1 was purified to have the COD, TP, TN, and SS concentrations...
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