Do Wet-Dry Ratio and Fe-Mn System Affect Oxidation-Reduction Potential Nonlinearly in the Subsurface Wastewater Infiltration Systems?

Xiaorong Zhang, Haibo Li, Yinghua Li, Fei Guo, Zhongxin Yang and Jianing Bai
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Xiaorong Zhang: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Haibo Li: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Yinghua Li: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Fei Guo: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Zhongxin Yang: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Jianing Bai: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

IJERPH, 2018, vol. 15, issue 12, 1-14

Abstract: To understand characteristics of on-line oxidation-reduction potential (ORP) in a subsurface wastewater infiltration system (SWIS) under different intermittent influent conditions, ORP among five matrix depths at wet-dry ratios (R wd s) of 2:1, 1:1 and 1:2 with a hydraulic load of 0.10 m 3 ·(m 2 ·d) −1 were monitored. Results showed that the optimal R wd for the SWIS was 1:1. In that case, ORP at 40 and 65 cm depths changed significantly, by 529 mV and 261 mV, respectively, from the inflow period to the dry period, which was conducive to the recovery of the oxidation environment. It was concluded that ORP varied nonlinearly in strongly aerobic and hypoxic environment. Wastewater was fed into the SWIS at 80 cm and dissolved oxygen diffused at the initial period of one cycle. As a consequence, ORP at 65 cm increased with water content increasing. However, ORP at 40 and 95 cm displayed inverse trends. Moreover, results showed that ORP decreased with Fe 2+ and Mn 2+ increasing under aerobic conditions ( p < 0.05) because Fe 2+ and Mn 2+ moved with wastewater flow. Effluent met reuse requirements and no clogging was found in the SWIS during the operation.

Keywords: wet-dry ratios; ORP; SWIS; redox microenvironment; Fe-Mn system (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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