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Comparative characterization of surface sludge deposits from fourteen French Vertical Flow Constructed Wetlands sewage treatment plants using biological, chemical and thermal indices
- Source :
- Science of the Total Environment, Science of the Total Environment, Elsevier, 2019, 647, pp.464-473. ⟨10.1016/j.scitotenv.2018.07.440⟩
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- International audience; Due to their design and mode of operation, French Vertical Flow Constructed Wetlands (VFCWs) accumulate suspended solids from the inflow wastewater in the form of a sludge layer at the surface of the first filter. In order to maintain the treatment performance over the long term, the characteristics of the sludge deposits and their evolution have to be well described. In this objective, a panel of sludge deposit samples taken from 14 French VFCW sewage treatment plants was investigated. Elemental composition and organic matter content, nature and reactivity were analyzed. Results clearly revealed two categories of sludge deposits, namely the “young-age plants” type (1 year of operation and less) and the “mature plants” type (3 years of operation and more). Sludge deposits from the “mature plants” exhibited same biological, physical and chemical properties. Their organic matter was globally less abundant, more humified and less biodegradable than in the young-age plants type. Their overall contents in trace metals were also higher, although in a limited manner. The effect of additional treatments, particularly FeCl3 injection for phosphorus precipitation, was observable in the “young-age plants” group. Finally, the sludge deposits sampled from one particular plant with specific operating conditions were found to exhibit very different characteristics from those of either groups identified. This observation underlined the influence of local conditions on the typology of the sludge deposits.
- Subjects :
- Environmental Engineering
010504 meteorology & atmospheric sciences
Characterization
Sewage
chemistry.chemical_element
Wastewater
010501 environmental sciences
Waste Disposal, Fluid
01 natural sciences
Sludge deposits
Environmental Chemistry
Organic matter
Waste Management and Disposal
0105 earth and related environmental sciences
chemistry.chemical_classification
Suspended solids
business.industry
Phosphorus
Pulp and paper industry
Pollution
Constructed wetland
Ageing
Waste treatment
chemistry
Wetlands
Environmental science
Sewage treatment
France
[CHIM.OTHE]Chemical Sciences/Other
business
Filtration
Indices
Subjects
Details
- ISSN :
- 00489697 and 18791026
- Volume :
- 647
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....ec9d5170e47d14fe8fcf217518c334f5