地下污水渗滤系统基质层ORP扰动特征及其影响因素

以往研究认为基质氧化还原电位分区呈垂直线性变化， 且即使存在微区穿透现象，也未能获得充分的实验证实.为揭示氧化还原微区变化规律及其影响因素， 采用土柱模拟方法探究了水力负荷与湿干比对氧化还原微区的扰动规律.结果表明: 在中等水力负荷(0.1m³/(m²·d))下， 湿干比变化可诱导氧化还原电位分区纵向移动，硝化区随湿干比增大而缩小， 反硝化区反之;湿干比过大可导致硝化与反硝化微区互穿透， 产生非线性分区; 水力负荷变化对氧化还原微环境扰动显著，负荷增大对中下层影响更明显;湿干比为4h∶8h时， 氧化还原电位分区随水力负荷变化呈明显线性波动.

Matrix ORP Disturbance Characteristics and Its Affecting Factors in Subsurface Wastewater Infiltration System

Previous studies supported that the matrix ORP (oxidation reduction potential) partition varied linearly in the vertical direction. Even if there is mutual penetration between micro-zones， it has not been experimentally confirmed. To reveal the disturbance feature of ORP and its affecting factors， a soil column simulation experiment was conducted to study how the hydraulic loads(HLs)and wet-dry period ratios(WDPRs)influenced the OPR. The results indicated that， under a moderate HL(0.1m³/(m²·d))， ORP micro-zones moved vertically along with the soil matrix inducted by WDPR. Nitrification zone expanded and denitrification zone zoomed out when DWPR was increased. Moreover， extreme small WDPR would cause nonlinear ORP partition， i.e.， mutual penetration between nitrification and denitrification zones. HL variety affected ORP micro-environment obviously， especially in the middle and lower layers of matrix while HL increased. Under 4h∶8h WDPR， linear ORP partition was the dominant trend along with HL variety.