An empirical and statistical investigation on decarbonizing groundwater using industrial waste-based biochar: Trading-off zero-waste management and zero-emission target.

This study recommended a trade-off between zero-waste management of a brewery industry and zero-aim target of the drinking water sector. This study mainly aimed to decrease the carbon dioxide (CO2) emissions resulting from groundwater treatment using biochar derived from malt sprout (MS) which is a waste by-product of a brewery industry. Also, CO2 resulting from groundwater treatment was collected and gas adsorption was performed to define the CO2 adsorption capacity of each biochar. Data Envelopment Analysis (DEA) was performed to determine the effect of groundwater quality on CO2 emissions. In the result of experimental and computational analysis, a new carbon capture indicator (CCIB) was derived depending on biochar adsorption process, in this study. The results revealed that averagely 28.98 % of reduction on CO2 emission from groundwater treatment was reported using the mixture of three malt sprout derived biochar. MS1 had the highest carbon capture capacity which was derived at 300 °C. According to (DEA) results, the optimum total organic carbon (TOC) should be 3.2 mg/L for the minimum CO2 emission. Also, optimum biochar dose, contact time and gas flow were 8 g, 10 min and 965 mL/d, respectively for the maximum CO2 adsorption by biochar according to Box-Behnken design method.