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

被引:7
|
作者
Zhang, Xiaorong [1 ]
Li, Haibo [1 ]
Li, Yinghua [1 ]
Guo, Fei [1 ]
Yang, Zhongxin [1 ]
Bai, Jianing [1 ]
机构
[1] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
wet-dry ratios; ORP; SWIS; redox microenvironment; Fe-Mn system; NITROGEN REMOVAL; INTERMITTENT OPERATION; N2O EMISSION; SOIL; PH; AERATION; ORGANICS; CARBON; EH;
D O I
10.3390/ijerph15122790
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 Fe2+ and Mn2+ increasing under aerobic conditions (p < 0.05) because Fe2+ and Mn2+ moved with wastewater flow. Effluent met reuse requirements and no clogging was found in the SWIS during the operation.
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页数:14
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