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

doi:10.12068/j.issn.1005-3026.2019.11.022

Abstract

Abstract: 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.

Key words: subsurface wastewater infiltration system(SWIS), oxidation reduction potential(ORP), disturbance, wet-dry period ratio(WDPR), hydraulic load(HL)

CLC Number:

X506

LI Hai-bo， LI Ying-hua ， BAI Xue-yu， BAI Jia-ning. Matrix ORP Disturbance Characteristics and Its Affecting Factors in Subsurface Wastewater Infiltration System[J]. Journal of Northeastern University Natural Science, 2019, 40(11): 1641-1647.

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