Nitrogen removal processes in deep subsurface wastewater infiltration systems

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

“…The NH 4 + -N removal rate quickly increased to 39.8% at 0.26-0.55 m with 24.7 mg/L (on average) in effluent A2 and 34.7% at 0.55-0.88 m with 9.9 mg/L in effluent A3. The TOC was mainly removed at 0.1-0.55 m, while NH 4 + -N was removed by 74.5% at 0.26-0.88 m. This result was consistent with previous study that the degradation of organic matter was prior to NH 4 + -N in SWIS (Zhang et al, 2015). Meanwhile, the pH gradually decreased from effluent A1 to A4 (Fig.…”

Organic matter and nitrogen removal in a hybrid upflow anaerobic sludge blanket—Moving bed biofilm and rope bed biofilm reactor

“…In present experiment due to presence of sufficient alkalinity and innovative reactor design, with moving rope bed and oxic-anoxic environment, a total nitrogen removal of 89 ± 8% could be observed at an influent loading rate of 0.3 g N/L.day. Previously similar TN removal rates of 87% via nitritation-denitritation and 84% in subsurface infiltration systems was reported by Zeng et al (2014) and Zhang et al (2015), respectively. Simple operation and innovative reactor design of the present RBBR, makes it an attractive option for higher rate of organic matter and nitrogen removal from UASB-MBBR effluent.…”

Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

“…Higher temperatures enhance biological and chemical reactions including denitrification. Willems et al [44] also reported that the denitrification rates generally decreased at lower temperature.…”