Combination of solar advanced oxidation processes and biological treatment strategy for the decolourization and degradation of pulp and paper mill wastewater

Abstract

This study is focused on the investigation of seven treatment strategies and the percentage reduction on COD and colour was evaluated and total time required for different treatment strategies were calculated. The results revealed that the COD and colour removal of 97% and 92%, respectively, was attained at 180 min of treatment for the coupled SPF-biological process, 97% and 90% of COD and colour removal was attained at 195 min of treatment for the coupled SPC-biological process whereas 98% and 95% of COD and colour removal at 95 min of treatment for the coupling of combined SPF-PC-biological process confirming the efficiency of the coupled process with a relatively shorter reaction time compared with the other processes. The values of the first order kinetics for the combined SPF-PC-biological process were 0.03 min-1 which is eight times greater than the biological process and 1.4 and 1.87 times faster than the coupled SPF-biological and SPC-biological process, respectively. The economic analysis of various AOPs and the relative cost of AOP-biological processes were discussed and the coupling of combined SPF-PC-biological process was found to be a technically and economically effective in treatment of pulp and paper mill wastewater to meet the effluent discharge standard.

Improvement of stability and reduction of energy consumption for Ti-based MnOx electrode by Ce and carbon black co-incorporation in electrochemical degradation of ammonia nitrogen

“…The physical technologies include coagulation/flocculation (Mamelkina et al 2020), separation membrane (Tavangar et al 2020) and adsorption (Bacelo et al 2020;Choudhary et al 2020;Imran et al 2021). The biological treatments have been studied including anaerobic process, activated sludge process and so on (Gopalakrishnan et al 2019;Wu et al 2021). The chemical technology, such as ozonation and oxidation with catalysts (Silva et al 2019;Liu et al 2021), as well as advanced oxidation processes (AOPs), have been widely used in wastewater treatment due to its effectiveness.…”