Cost-effective removal of cod in the pre-treatment of wastewater from paper industry

Different pre-treatment processes were applied to investigate the removal of chemical oxygen demand (COD) from paper mill effluent. The objective of this paper is to find the optimal operating conditions for coagulation process. The effect of key operational parameters, including the type of coagulant, initial pH, temperature, and coagulant dose, on the percent removal of COD was investigated. Under the optimal operational conditions, the treatment of wastewater from paper industries by coagulation has led to a reduction of fee paid for wastewater discharged. © Springer Nature Switzerland AG 2020.