Removal processes of indicator organisms and opportunistic pathogens in an anaerobic digester‐constructed wetland system

Factors affecting the removal of opportunistic pathogens were evaluated in a hybrid constructed wetland (CW2) treating rural wastewater. The correlations between the bacterial population and the environmental variables showed that bacteria discharge was the result of abiotic factors change such as t...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2020-12, Vol.34 (S1), p.342-354
Main Authors: Khouja, Ibtissem, M’Hiri, Fadhel, Ouzari, Hadda‐Imene, Saidi, Neila
Format: Article
Language:English
Subjects:
Abiotic factors
Ammonia
Anaerobic processes
Antagonism
Artificial wetlands
Availability
Bacteria
Biochemical oxygen demand
Biotic factors
Chemical oxygen demand
correlation
Dissolved oxygen
Electrical conductivity
Electrical resistivity
factors
hybrid constructed wetland
indicator organisms
Microorganisms
Nitrogen
Nutrient availability
Opportunist infection
opportunistic pathogens
Organic matter
Orthophosphate
Oxygen
Pathogens
Removal
Rural environments
rural wastewater
Solid suspensions
Suspended particulate matter
Total oxygen demand
Total suspended solids
Wastewater
Wastewater composition
Wastewater treatment
Wetlands
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Summary:Factors affecting the removal of opportunistic pathogens were evaluated in a hybrid constructed wetland (CW2) treating rural wastewater. The correlations between the bacterial population and the environmental variables showed that bacteria discharge was the result of abiotic factors change such as temperature (T), electrical conductivity (EC), dissolved oxygen (DO), organic matter and nutrient availability, as well as biotic factors like antagonism and competition with the native microbial community. However, the contribution of each factor depends on bacteria nature, on the influence of wetland design, availability of oxygen, season, presence of plant, and wastewater composition. Higher removals rates of biochemical oxygen demand BOD5 (94.64 ± 3.92%), chemical oxygen demand COD (90.91 ± 6.81%), total suspended solids TSS (98.05 ± 1.18%), nitrogen (total Kjeldahl nitrogen TKN (81.78 ± 11.01%), ammonia nitrogen NH4+ (92.17 ± 6.56%), orthophosphate PO43- (79.73 ± 10.41%) and bacteria (>98%) were observed in CW2.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12531