Study on Operation Effect of Two-Stage MSL System for Rural Decentralized Sewage Treatment DOI Open Access

Qingtao Hu,

Anhong Bao,

Zenan Niu

et al.

Water, Journal Year: 2024, Volume and Issue: 16(22), P. 3204 - 3204

Published: Nov. 8, 2024

To improve the removal efficiency of rural domestic sewage, a two-stage multi-soil-layer sewage treatment system with an “aeration section + non-aeration section” was designed, and its performance observed under different influent loads aeration intensities. The experiment ran for total 150 days, results showed that (MSL) could effectively reduce effluent concentration to meet discharge standards. Under operating conditions hydraulic load 1000 L·m−2·d−1 air–water ratio 4:1, final average concentrations COD, NH3-N, TN, TP were 106.5 mg·L−1, 7.4 13.9 0.12 18.6 respectively, rates 85.3%, 82%, 72.5%, 96%, 85%. A longer retention time ideal anoxic ensured by designing certain height in system. Adding allowed synchronous nitrification–denitrification reaction reasonable loads, ultimately enabling

Language: Английский

Assessment of secondary metabolites in Pennisetum purpureum planted into constructed wetlands using shale and laterite as substrate for wastewater treatment DOI Creative Commons

Nadège Fatim Traoré,

Jean-Marie Pétémanagnan Ouattara, Franck Michaël Zahui

et al.

Heliyon, Journal Year: 2024, Volume and Issue: 10(13), P. e33284 - e33284

Published: June 18, 2024

Constructed wetlands (CWs) are systems designed to maximize pollutants removal by various mechanisms, most of which associated with the presence plants. However, substances secreted plants defend themselves against external aggressions during their growth very little studied in these systems. This study aimed characterize chemical constituents Pennisetum purpureum extracts used an experimental mesocosm filled shale and laterite treating domestic wastewater. Above-ground biomass, strain diameter secondary metabolites P. grown on different substrates (shale laterite) were monitored, as those site (control). In addition, performance oxygen demand (COD), biochemical (BOD5), total Kjedahl nitrogen (TKN) Total Phosphorus (TP) was determined at outlet CWs. Plant biomass measured bed (13.7 ± 0.5 kg m−2) higher than (12.5 0.1 m−2), both lower obtained natural environment (14.9 0.6 m−2). Performances ranged from 83 5.4 76.9 7 % 84.7 6.8 78 8.1 72.2 10.7 55.5 16.4 (NTK) 72.4 4.9 58.4 3.4 (TP), efficiencies shale-filled bed. richer (total polyphenol [73.5 mgEAG/gMS], flavonoids [18.1 mgEQ/gMS] condensed tannin [13.3 mgEC/gMS]) more (57.7 mgEAG/gMS), (12.1 mgEQ/gMS) (12 mgEC/gMS) laterite-filled short, wastewater filtration materials have influence secretion plant metabolites. two materials, seems be better suited CWs, it promotes close environment.

Language: Английский

Citations

2
Study on Operation Effect of Two-Stage MSL System for Rural Decentralized Sewage Treatment DOI Open Access

Qingtao Hu,

Anhong Bao,

Zenan Niu

et al.

Water, Journal Year: 2024, Volume and Issue: 16(22), P. 3204 - 3204

Published: Nov. 8, 2024

To improve the removal efficiency of rural domestic sewage, a two-stage multi-soil-layer sewage treatment system with an “aeration section + non-aeration section” was designed, and its performance observed under different influent loads aeration intensities. The experiment ran for total 150 days, results showed that (MSL) could effectively reduce effluent concentration to meet discharge standards. Under operating conditions hydraulic load 1000 L·m−2·d−1 air–water ratio 4:1, final average concentrations COD, NH3-N, TN, TP were 106.5 mg·L−1, 7.4 13.9 0.12 18.6 respectively, rates 85.3%, 82%, 72.5%, 96%, 85%. A longer retention time ideal anoxic ensured by designing certain height in system. Adding allowed synchronous nitrification–denitrification reaction reasonable loads, ultimately enabling

Language: Английский

Citations

0