Abstract
以污水厂尾水为处理对象,研究垂直流人工湿地在4种水力负荷(125、250、375和500mm/d)条件下的周年净化效果,结果表明:秋季时系统的总氮去除率最高,冬季则显著降低;温度为10℃、溶解氧浓度为1.1mg/L是反硝化强度显著降低的关键拐点;总磷在冬季较其他季节净化效果高;125 mm/d水力负荷下COD<sub>Cr</sub>去除率显著高于其他水力负荷,冬季COD<sub>Cr</sub>去除率显著降低,而其他水力负荷及季节下的去除效果没有显著差异;当湿地以高去除率为目标时,最佳水力负荷为125mm/d;当湿地以地表水水环境质量Ⅴ类标准为目标时,最佳水力负荷为375mm/d;当湿地以污染物去除量为目标时,最佳水力负荷为500mm/d.综合推荐375mm/d为最佳水力负荷.;Four vertical flow constructed wetlands were employed to evaluate the purification effects within tail water in different seasons under four hydraulic loading rates (125, 250, 375 and 500 mm/d). The results showed that the highest removal efficiency of total nitrogen was achieved in autumn while decreased significantly in winter. The key points of temperature and dissolved oxygen for denitrification were 10℃ and 1.1 mg/L, respectively. The wetland system was more effective for phosphorus removal in winter than in other seasons. Removal efficiency of COD<sub>Cr</sub> under 125 mm/d was significantly higher than that of other hydraulic loading rates, the lowest treatment performance of COD<sub>Cr</sub> was achieved in winter,and with no significant variation in other hydraulic loading rates and other seasons. To obtain a full pollutant-removal efficiency of the wetland system, the optimal hydraulic loading rate is at 125 mm/d. To reach the V class of surface water environment quality standard, the optimal hydraulic loading rate is at 375 mm/d. To receive the amount of pollutant removal, the optimal hydraulic loading rate is 500 mm/d. Based on full consideration, the optimal hydraulic loading rate should be at 375 mm/d.
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