Comparison of different approaches for color and COD removal from paper and pulp industry effluent

摘要

Effluent from the paper and pulp industry has been treated by various single and integrated approaches. Single approaches include sand filtration, algal treatment, chemical coagulation, electrocoagulation, and ozonation. Whereas the combinations of pre-chemical coagulation and sand filtration, pre-chemical coagulation and ozonation, post-chemical coagulation and ozonation, and pre-electrocoagulation and sand filtration were included in integrated approaches for determination of COD and color removal efficiencies. The application of sand filtration, algal treatment, chemical coagulation, electrocoagulation and ozonation have been deliberated the removal efficiencies (%) for COD as 8.73, 78.18, 16.96, 70.37 and 81.19 and for color as 9.09, 48.72, 58.57, -53.48 and 81 respectively. Subsequently the applications of combinations of pre-chemical coagulation and sand filtration, pre-chemical coagulation and ozonation, post-chemical coagulation and ozonation, and pre-electrocoagulation and sand filtration have resulted in the removal efficiencies (%) for COD as 97.33, 56.12, 88.04 and 70.33. Color removal efficiencies were 76.36, 76.36, 78.18 and 67.15 respectively. The integration of alum coagulation and sand filtration were found to be most effective and economical methods.