Application of biochars derived from agriculture wastes for wastewater treatment

Abstract

Canteen wastewater obtains a highly organic compound which should be treated before discharge to the environment. In this study, corn cob and pineapple peel were converted to biochar by pyrolysis at 400 450 and 500oC. The yield of corn cob and biochar pineapple peel were 29.24 to 34.94% and 34.67 to 46.34%, respectively. Corn cob biochar at 400°C has a surface area 7.685 m2/g and a high total pore volume that shows the potential of adsorption wastewater. The experiment was conducted by vary the ratio of biochar (30g, 15g and 10g) in 300 ml. of canteen wastewater for 3 day. The result showed that corn cob biochar at 400°C had high efficiency to treat canteen wastewater. The removal of total Kjeldahl nitrogen (TKN) was 85.38% of and pH was increased until the acceptable value of the domestic wastewater standard. Moreover, the result indicated that biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS) and oil and grease of wastewater significantly decreased. Therefore, corn cob and pineapple peel can be converted to biochar for treatment canteen wastewater.