School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China.
Int J Environ Res Public Health. 2018 Dec 9;15(12):2790. doi: 10.3390/ijerph15122790.
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 (Rs) of 2:1, 1:1 and 1:2 with a hydraulic load of 0.10 m³·(m²·d) were monitored. Results showed that the optimal R 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 and Mn increasing under aerobic conditions ( < 0.05) because Fe and Mn moved with wastewater flow. Effluent met reuse requirements and no clogging was found in the SWIS during the operation.
为了了解不同间歇进水条件下地下污水渗滤系统（SWIS）中在线氧化还原电位（ORP）的特征，在水力负荷为 0.10 m³·(m²·d)下，监测了湿干比（Rs）为 2:1、1:1 和 1:2 时五个基质深度的 ORP。结果表明，SWIS 的最佳 Rs 为 1:1。在这种情况下，40 和 65 cm 深度的 ORP 分别从进水期到干燥期显著变化了 529 mV 和 261 mV，有利于氧化环境的恢复。可以得出结论，ORP 在强需氧和缺氧环境中呈非线性变化。将废水注入 SWIS 时，溶解氧在一个周期的初始阶段扩散。因此，随着含水量的增加，65 cm 处的 ORP 增加。然而，40 和 95 cm 处的 ORP 呈现相反的趋势。此外，结果表明，在需氧条件下（<0.05），由于 Fe 和 Mn 随废水流动，Fe 和 Mn 的增加会导致 ORP 降低。在运行过程中，SWIS 的出水符合回用要求，且未发现堵塞。
