Nitrogen removal enhanced by intermittent operation in a subsurface wastewater infiltration system

Municipal wastewater treatment using novel constructed soil filter system

“…ECEC was calculated as the sum of exchangeable cations. Nitrification potential of the media was measured as per Zhang et al (2005).…”

Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

“…Furthermore, these wastewater treatment technologies such as activated sludge process, membrane bioreactors and membrane separation, are expensive and require complex operations and maintenance (Wu et al, 2015a). Fortunately, subsurface wastewater infiltration system (SWIS) is an attractive alternative for domestic wastewater treatment for small towns, suburban developments, and rural regions due to its low construction and operation costs, excellent pollutant removal performance, less maintenance need and environmental release (Zhang et al, 2005).…”

“…SWIS is effective to treat domestic wastewater according to integrated mechanisms of chemical, physical and biological reactions if the infiltration system was carefully designed and managed (Zhang et al, 2005). The pollutant removal performance in SWIS http://dx.doi.org/10.1016/j.biortech.2015.12.088 0960-8524/Ó 2016 Elsevier Ltd. All rights reserved.…”

“…Substrate clogging is the inevitable consequence if this trend continuing. Accordingly, intermittent operation (Leuerenz et al, 2009;Li et al, 2012;Zhang et al, 2005), a special configuration with ring filter (Llorens et al, 2011), and using amended soil to replace original soil (Zou et al, 2009) have been developed to improve the oxygen availability. Intermittent operation allows for endogenous decay and desiccation to partially recover the filter porosity, leading to improvement of the removal efficiency of pollutants.…”

Characteristics of subsurface wastewater infiltration systems fed with dissolved or particulate organic matter

“…Subsurface wastewater infiltration system (SWIS) is an effective way to treat wastewater according to integrated mechanisms of chemical, physical and biological reactions as it passes through the unsaturated soil in infiltration system (USEPA 2002;Zhang et al 2005;Wang et al 2010). Compared to the conventional activated sludge and biofilm processes, this system has better performance in organic substance and phosphorus removal, lower construction and operational costs, and easier management and maintenance (Yamaguchi et al 1996;USEPA 2002;Li et al 2012).…”