The effect of sub-irrigation with untreated and treated municipal wastewater on organic matter and Nitrogen content on two soil types

Abstract

<p>In order to study the chemical parameters of the soil after sub-irrigation with wastewater, a system was installed in one of the greenhouses of the Agricultural University of Athens. Wastewater was applied subsurface into the soil mass of the pots were used. Three treatments were used: Untreated wastewater (U), Treated wastewater (T) and tap water (W) as control. Two different types were used: Soil (a) characterized as Sandy loam and soil (b) characterized as Loamy sand. Moreover, in order to investigate the change of total Nitrogen and organic matter concentrations at the point where the emitter was placed, the soil mass was divided into two zones. The upper (zone I) and the lower one (zone II). The total nitrogen content, ammonia nitrogen (NH4-N), nitrogen nitrate (NO3-N) and the percentage of organic matter, were determined in the soil samples. Statistically significant differences (p <0, 05) were observed in the organic matter and the total N%, only for soil (b). For soil (a), organic matter percentage was increased in zone (I) (irrigation with treated wastewater at 20 cm depth). For soil (b), total N% was increased in zone (I), while nitrate and ammonium were increased in zone (II) (irrigation with untreated wastewater at 20 cm depth).</p>

Effect of Recurrent Irrigation with Treated Sewage from Anaerobic Digester Coupled with Anaerobic Baffled Reactor on Soil Fertility

“…The differences were observed at the depths of 20-40 cm (P = 0.0138) and 40-60 cm (P = 0.0327) after the second farming cycle; and at 0-20 cm (P = 0.0008) and 20-40 cm (P = 0.0077) after the third farming cycle. This was attributed to the difference in the nitrogen and organic matter concentrations of the treated sewage and tap water, in line with previous studies (Tsigoida and Argyrokastritis, 2019).…”

“…Despite of the on recurrent irrigation (Disciglio et al, 2015). Increased NO3-N in the upper layer after the third farming cycle may be associated with nitrogen components in the treated sewage on recurrent irrigation and the decompsition of the organic matter which produces NH4-N that is readily converted into NO3-N (Disciglio et al, 2015;Salgado-Méndez et al, 2019;Tsigoida and Argyrokastritis, 2019). Irrigation with tap water reduced soil NO3-N at the sampled depths for all farming cycles.…”

Silver nanoparticle filter for domestic wastewater reuse

“…Similarly, UW treated with soil/sand filters showed 0.06 mg L −1 ammonium and 1.48 mg L −1 nitrate in the filtrate of Likovrisis plant (Attica, Greece). 35…”