The new report of domestic wastewater treatment and bioelectricity generation using Dieffenbachia seguine constructed wetland coupling microbial fuel cell (CW-MFC)

Abstract

The constructed wetland integrated with microbial fuel cell (CW-MFC) has gained attention in wastewater treatment and electricity generation owing to its electricity generation and xenobiotic removal efficiencies. This study aims to use the CW-MFC with different macrophytes for domestic wastewater treatment and simultaneously electricity generation without chemical addition. The various macrophytes such as Crinum asiaticum, Canna indica, Hanguana malayana, Philodendron erubescens, and Dieffenbachia seguine were used as a cathodic biocatalyst. The electrochemical properties such as half-cell potential and power density were determined. For wastewater treatment, the chemical oxygen demand (COD) and other chemical compositions were measured. The results of electrochemical properties showed that the maximal half-cell potential was achieved from the macrophyte D. seguine. While the maximal power output of 5.42±0.17 mW/m 2 (7.75±0.24 mW/m 3 ) was gained from the CW-MFC with D. seguine cathode. Moreover, this CW-MFC was able to remove COD, ammonia, nitrate, nitrite, and phosphate of 94.00±0.05%, 64.31±0.20%, 50.02±0.10%, 48.00±0.30%, and 42.05±0.10% respectively. This study gained new knowledge about using CW-MFC planted with the macrophyte D. seguine for domestic wastewater treatment and generation of electrical power as a by-product without xenobiotic discharge.

The effect of fermentation modes on the efficiency of organic waste treatment in batch bioreactors

“…Therefore, there is an urgent need to develop new approaches for the effective degradation of solid organic waste. Biological processes are considered promising for providing effective degradation of organic waste (Chaijak and Sola 2023) while also yielding valuable by-products. For example, composting produces nutrient-rich compost that enhances soil fertility (Chen, Zhang, and Yuan 2020;Bernstad, Cánovas, and Valle 2017), while anaerobic fermentation can generate methane or hydrogen (Chen, Zhang, and Yuan 2020;Havryliuk et al 2023).…”