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Enhancing wastewater remediation by drinking water treatment residual-augmented floating treatment wetlands

Shen, C., Zhao, Y.Q., Liu, R.B., Morgan, D., Wei, T.
The Science of the total environment 2019 v.673 pp. 230-236
adsorption, aeration, biomass, chemical oxygen demand, dissolved oxygen, drinking water treatment, nitrogen, phosphorus, remediation, salts, sediments, total nitrogen, total phosphorus, wastewater, wetlands
In this study, the involvement of aluminum-based drinking water treatment residual (DWTR) as substrate in floating treatment wetland (FTW) to enhance its treatment performance was firstly proposed and trialed. A laboratory scale DWTR-FTW fed with synthetic wastewater containing COD, nitrogen (N), phosphorus (P) and mineral salts was operated in three stages of unplanted (1–30 days), planted (31–60 days) and aerated (61–135 days) modes. The results showed that the average removal rates of COD, total nitrogen (TN), total phosphorus (TP) in stage 3 were 88%, 85%, and 90.2%, respectively, indicating the outstanding purification performance of DWTR-FTW in comparison of traditional FTWs. The embedded DWTR enriches the biomass and robustly adsorbs P, while aeration supplies sufficient dissolved oxygen for the microorganism. The results revealed that 7.022 g P was accumulated in DWTR, which is 400 times higher than that in sediment and plants during the experimental period, reflecting that DWTR adsorption is the major P removal pathway in DWTR-FTW. Overall, DWTR-FTW could significantly remove pollutants, especially P, and provide an alternative pathway to enhance purification performance of FTW.