A new type of dual rotation subsurface flow wetland was designed in order to solve the easy clogging problem of the vertical subsurface flow wetland. This new type of wetland realizes dual rotation of the pretreatment pool and the upper layer of the main pool and periodical change of the water flow direction through controlling the switch of the inlet and outlet valves, in order to improve the anti-clogging effect. A test on the pollutant removal effect of the new type of wetland was conducted under conditions of four different rotation periods, and the optimal rotation period was determined as five days. The anti-clogging ability and decontamination effect of the new type of wetland operated under the 5-day rotation period and the traditional subsurface flow wetland were compared. After 40, 140, and 160 days of operation, the porosities of the new type of wetland were 48.43%, 46.36%, and 46.21%, respectively, and the values of the traditional wetland were 46.89%, 38.72%, and 44.37%, respectively. The substrate porosity of the new type of wetland decreased less than that of the traditional wetland. Moreover, the removal rates of NH3-N, NO-3-N, TN, COD, and TP of the new type of wetland after 160 days were 60.40%, 70.80%, 56.53%, 53.12%, and 48.30%, respectively, and the values of the traditional wetland were 34.99%, 51.70%, 41.43%, 29.84%, and 47.06%, respectively. The removal rates of pollutants of the new type of wetland were higher than those of the traditional wetland, and the values of the new type of wetland decreased less than those of the traditional wetland. The new type of wetland has a relatively stable pollutant removal effect throughout the operation process, providing a new method to effectively alleviate the clogging problem.
华祖林,张子豪,沈志伟,等.一种新型双重轮休式潜流湿地及其抗堵塞与去污效果[J].水资源保护,2022,38(3):140-146.(HUA Zulin, ZHANG Zihao, SHEN Zhiwei, et al. Anti-clogging and decontamination effects of a new type of dual rotation subsurface flow wetland[J]. Water Resources Protection,2022,38(3):140-146.(in Chinese))复制