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Efficiency evaluation and dynamic modeling of intermittently aerated horizontal subsurface-flow constructed wetlands

Grant number: 17/18075-8
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): December 01, 2017
Effective date (End): November 30, 2020
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal researcher:Marcelo Loureiro Garcia
Grantee:João Gabriel Thomaz Queluz
Home Institution: Instituto de Geociências e Ciências Exatas (IGCE). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
Associated research grant:15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery, AP.TEM


Introduction: Constructed wetland (CW) is an efficient system for the treatment of domestic wastewater. The use of intermittent aeration in CW allows nitrification and denitrification to occur simultaneously, increasing the efficiency of total nitrogen removal. Since this is a dynamic system, the characteristics of the treated effluent vary greatly. Dynamic models would allow the evaluation of the behavior of CW over time. Objective: Develop and evaluate the efficiency of artificially aerated CWs, evaluate the performance of hydraulic models and develop a model using the System Dynamics methodology to evaluate and simulate the behavior of constructed wetland components and their specific interrelationships over time. Material and methods: Five horizontal subsurface-flow CWs with different aeration intervals (0, 3, 6, 12 and 24 h d-1) will be evaluated. The behavior of the CWs will also be evaluated using different oxygen application rates (0, 3, 6, 12 and 20 L min-1). Each CW will receive a daily flow of 10 L of synthetic domestic wastewater, resulting in a hydraulic retention time of 4.5 days. The following parameters will be evaluated in each CW: biochemical oxygen demand, chemical oxygen demand, suspended solids, turbidity, dissolved oxygen, redox potential, pH, total nitrogen, nitrate, nitrite, total phosphorus, potassium, electrical conductivity, temperature and flow. The chemical oxygen demand and total nitrogen data determined throughout the five CWs will be compared in terms of the coefficient of determination (R2) with estimated values provided by hydraulic models. Additionally, will be developed a dynamic model in the SIMILE software which will allow to simulate the behavior of aerated CWs over time.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
YABUKI, L. N. M.; QUELUZ, J. G. T.; GARCIA, M. L. Assessment of phase distribution and removal of metals in anaerobic digesters. INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, v. 19, n. 1, p. 463-474, JAN 2022. Web of Science Citations: 0.
ISABELA PIRES DA SILVA; GABRIELA BARBOSA DA COSTA; JOÃO GABRIEL THOMAZ QUELUZ; MARCELO LOUREIRO GARCIA. Effect of hydraulic retention time on chemical oxygen demand and total nitrogen removal in intermittently aerated constructed wetlands. Rev. Ambient. Água, v. 15, n. 3, p. -, 2020.

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