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Changes in bacteria composition and efficiency of constructed wetlands under sustained overloads: A modeling experiment
- Source :
- Science of the Total Environment, Science of the Total Environment, Elsevier, 2018, 612, pp.1480-1487. ⟨10.1016/j.scitotenv.2017.08.265⟩, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), Recercat. Dipósit de la Recerca de Catalunya, instname
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- International audience; The average organic and hydraulic loads that Constructed Wetlands (CWs) receive are key parameters for their adequate long-term functioning. However, over their lifespan they will inevitably be subject to either episodic or sustained overloadings. Despite that the consequences of sustained overloading are well known (e.g., clogging), the threshold of overloads that these systems can tolerate is difficult to determine. Moreover, the mechanisms that might sustain the buffering capacity (i.e., the reduction of peaks in nutrient load) during overloads are not well understood. The aim of this work is to evaluate the effect of sudden but sustained organic and hydraulic overloads on the general functioning of CWs. To that end, the mathematical model BIO_PORE was used to simulate five different scenarios, based on the features and operation conditions of a pilot CW system: a control simulation representing the average loads; 2 simulations representing +10% and +30% sustained organic overloads; one simulation representing a sustained +30% hydraulic overload; and one simulation with sustained organic and hydraulic overloads of +15% each. Different model outputs (e.g., total bacterial biomass and its spatial distribution, effluent concentrations) were compared among different simulations to evaluate the effects of such operation changes. Results reveal that overloads determine a temporary decrease in removal efficiency before microbial biomass adapts to the new conditions and COD removal efficiency is recovered. Increasing organic overloads cause stronger temporary decreases in COD removal efficiency compared to increasing hydraulic loads. The pace at which clogging develops increases by 10% for each 10% increase on the organic load.
- Subjects :
- Environmental Engineering
CONSTRUCTED WETLAND
Zones humides artificials
0208 environmental biotechnology
ORGANIC LOAD
Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua [Àrees temàtiques de la UPC]
Biomass
Wetland
02 engineering and technology
010501 environmental sciences
01 natural sciences
Clogging
Hydraulic load
Environmental Chemistry
Effluent
Waste Management and Disposal
BUFFERING CAPACITY
0105 earth and related environmental sciences
geography
BIO_PORE
Buffering capacity
Constructed wetland
Organic load
Pollution
geography.geographical_feature_category
Constructed wetlands
Environmental engineering
15. Life on land
020801 environmental engineering
13. Climate action
[SDE]Environmental Sciences
HYDRAULIC LOAD
Environmental science
Subjects
Details
- Language :
- English
- ISSN :
- 00489697 and 18791026
- Database :
- OpenAIRE
- Journal :
- Science of the Total Environment, Science of the Total Environment, Elsevier, 2018, 612, pp.1480-1487. ⟨10.1016/j.scitotenv.2017.08.265⟩, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC), Recercat. Dipósit de la Recerca de Catalunya, instname
- Accession number :
- edsair.doi.dedup.....9e2a6bc012dbb919e2afbadef6c3bb91