Wastewater treatment and bioelectricity generation using constructed wetland integrated with microbial fuel cell
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A microbial fuel cell coupled with constructed wetland (CW-MFC) is a new and innovative device used to treat the different types of wastewater and produce energy which has also more wastewater treatment efficiency and more easy maintenance than others MFCs. In this work, the effects of hydraulic residence time (HRT) and different wetland plants were used for treatment and on the electricity production. The degradation characteristics of different wastewater were also investigated. The degradation rate and the electricity production increased to a peak before slowing down with the elongation of HRT. The highest degradation rate was obtained when HRT was 5days, the concentration of pollutants such as BOD, COD, chloride, sodium, potassium, sulphate and total nitrogen were reduced to by 96.98, 87.83, 62.91, 72.23, 82.71, 86.32, 78.55% respectively and pH was 7.23 by Canna and 96.97, 85.06, 70.14, 70.31, 69.48, 79.75, 69.95% respectively by Reed and pH was 7.23. Highest voltage generation was recorded 31.66 mV by Canna and 25.33 mV by Reed in the setup-1 and almost similar trends were also observed with other setup of other experiment for voltage and current generation and pollutant removal. The artificial neural network (ANN) models were developed on a daily basis with sigmoid as an activation function and subjected to a maximum of 20 iterations. In the setup-1, among the various ANN models, 4-4-1 was consider best because in this model with highest r- value, similarly in the setup 2,3,4, and 5, 4-2-1, 4-8-1, 4-10-1 and 4-8-1 models were found most suitable. Immobilized peroxidase enxyme on sodium alginate beads was also made and used in the microcosm for lignin dedradation. Optimization of various concentrations of wastewater and HRT for degradation of the lignin, electricity generation and COD removal by peroxidase enzyme were also studied mathematically by using Response Surface Methodology model. After optimization the maximum values were calculated treatment - 74.99%, HRT- 3.08 days and concentration of peroxidase 10 mg/L.
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