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Decentralized Domestic Sewage Treatment Using an Integrated Multi-Soil-Layering and Subsurface Wastewater Infiltration System
- Source :
- Water, Volume 13, Issue 4, Water, Vol 13, Iss 431, p 431 (2021)
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- In this study, an integrated multi-soil-layering and subsurface wastewater infiltration (MSL-SWI) system was developed for decentralized domestic sewage treatment under high hydraulic loading rates (HLRs). To improve sustainable nitrogen removal, the influence of intermittent operation and shunt distributing wastewater on the performance of MSL-SWI systems was investigated. The optimal performance—with removal efficiencies of 93.41% for chemical oxygen demand, 97.91% for total phosphorus, 74.02% for ammonia nitrogen, and 73.56% for total nitrogen—was achieved using both intermittent operation and shunt distributing wastewater under an HLR of 0.3 m3 m−2 d−1. The activity of microbial nitrogen functional genes (i.e., amoA, nirK, nirS, nosZ, and anammox 16S rRNA) and their relationships with nitrogen transformation rates were further analyzed in different layers of the system. The results imply that nitrification and anaerobic ammonium oxidation in the MSL section coupled with nitrification and denitrification in the SWI section contribute to main the mechanisms of sustainable nitrogen removal. In summary, MSL-SWI systems not only operate with high efficiency under high HLRs, but the contaminant removal is also stable and sustainable, which are promising properties for domestic sewage treatment in areas where land resources are limited.
- Subjects :
- lcsh:Hydraulic engineering
subsurface wastewater infiltration system
Geography, Planning and Development
0207 environmental engineering
chemistry.chemical_element
02 engineering and technology
010501 environmental sciences
Aquatic Science
nitrogen functional genes
01 natural sciences
Biochemistry
lcsh:Water supply for domestic and industrial purposes
lcsh:TC1-978
domestic sewage treatment
020701 environmental engineering
0105 earth and related environmental sciences
Water Science and Technology
lcsh:TD201-500
multi-soil-layering system
Chemical oxygen demand
Environmental engineering
Nitrogen
Infiltration (hydrology)
chemistry
Wastewater
Anammox
Environmental science
Nitrification
Sewage treatment
Layering
Subjects
Details
- ISSN :
- 20734441
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Water
- Accession number :
- edsair.doi.dedup.....43ecb31d6cde80eef69ef29aa2dd4933