Nitrogen removal enhanced by shunt distributing wastewater in a subsurface wastewater infiltration system

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

“…Substrate oxidation reduction potential (ORP) and/or oxygen concentration decreased with depth because the oxygen from air diffused to the substrate was limited in non-aerated rapid infiltration system and SWIS (Dutta et al, 2015;Wang et al, 2010;Zhang et al, 2005). However, substrate ORP results still showed that aerobic conditions in the upper layer and anoxic or anaerobic conditions in the subsequent sections were well developed in a SWIS with continuous feed and intermittent aeration.…”

“…Moreover, unlike the excellent organic removal, nitrogen removal efficiency varies from 10% to 90% according to wastewater compositions, environmental conditions and operating conditions in SWIS (Pan et al, 2015;Wang et al, 2010). In addition, large footprint resulting from the low hydraulic capacity greatly restricts the large-scale application of SWIS in developing countries like China.…”

Nitrogen removal processes in deep subsurface wastewater infiltration systems

“…As a land treatment system (LTSs), the subsurface wastewater infiltration system (SWIS) is an ecological process that is widely used for on-site and decentralized wastewater treatment (USEPA, 2002;Wang et al, 2010). In conventional SWIS treatment, wastewater is first treated by conventional physical-chemical and/or biological methods in a septic tank and then is allowed to infiltrate through an aerated unsaturated zone where it is purified through processes such as filtration, adsorption, chemical reactions and biodegradation (Zhang et al, 2005).…”

The treatment performance and nutrient removal of a garden land infiltration system receiving dairy farm wastewater

“…researchers have modified the system to adapt to local conditions and influent quality (Christen et al, 2010;Hatt et al, 2007;Wang et al, 2010).…”