Synthetic Black Water Treatment by Aeroponic Cultivation of Water Spinach: Effect of the Pump Run Time
Benjian Sun 1, 2  
,   Jiyong Cen 1, 2  
,   Zhan Jin 1, 2  
,   Jin Zhou 1, 2  
,   Xianfeng Huang 1, 2  
,   Hainan Kong 3  
,   Min Zhao 1, 2  
,   Xiangyong Zheng 1, 2  
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School of Life and Environmental Science, Wenzhou University, Wenzhou325027, Zhejiang, China
Urban Water Pollution Ecological Treatment Technology Zhejiang Engineering Laboratory, Wenzhou325027, Zhejiang, China
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
Xiangyong Zheng   

School of life and environmental science, Wenzhou University, China
Submission date: 2019-12-14
Final revision date: 2020-07-30
Acceptance date: 2020-07-31
Online publication date: 2020-11-24
In this study, we report the treatment of simulated black water using a decentralised aeroponic system for the cultivation of water spinach. The effect of the pump run time on the treatment efficiency of black water at low temperature (15ºC±5ºC) in winter was systematically investigated. The results show that aeroponic cultivation process yields average chemical oxygen demand (COD) removal of 90.04%, ammonia nitrogen (NH4 +-N) reduction of 35.02%, total nitrogen (TN) abatement of 28.14%, and total phosphorus (TP) elimination of 14.71%. The increase in the pump run time from stop time (min) to spray time (s) ration of 45:30 (QW3) to 15:30 (QW1) significantly promotes the efficiency of the COD, NH4 +-N, TN, and TP removals. The sequence of the removal efficiency is as follows: QW1 (15:30)>QW2 (30:30)>QW3 (45:30). The higher efficiency of the COD and NH4 +-N removals in QW1 is due to the enhanced action of aerobic microorganisms because of the increased amount of dissolved oxygen. We believe that this study provides a simple and potential option for decentralised sewage.