Department of Chemistry, Fakir Mohan (Autonomous) College, Balasore, India
Advanced Management Institute for Training and Achievement, Thane, India
Purpose Huge quantity of paper mill wastes are dumped at the outskirt of factory as unwanted materials. Vermicomposting is an eco-friendly technique for benefcial conversion of diferent biodegradable/organic wastes into useful organic manure utilizing earthworms. Solid wastes generated in paper mills contain appreciable quantity of organic matter. Attempt was made for bio-conversion of Emami paper mill wastes with diferent numbers of Eisenia fetida (5–30 earthworms/2 kg substrate) for studying its infuence on vermi-conversing time and quality of prepared vermicompost. Method Vermicomposting was carried out in trays following heap method and quality of fnal product was determined following both chemical analysis and bioassay on wheat seedlings. Results Application of more earthworms up to 20 numbers per 2 kg substrate made bio-conversion quicker but further addition of earthworm, however, delayed the process as some earthworms came out of beds and died probably due to competition for food among earthworms inside beds. Ten earthworms per kg paper mill wastes–saw dust–cow dung mixture (1:0.5:0.5 weight wise) was found as optimum earthworm population for preparing quality vermicompost having more major and secondary plant nutrients. Bioassay of this manure on wheat seedlings also confrmed the analytical fndings. Conclusion It is confrmed that earthworm population in vermibed played vital role in faster decomposition of paper mill wastes and releasing of more nutrients, which ultimately helped in better growth of wheat seedlings. Successful demonstration of vermicomposting technique will encourage local farmers for benefcial utilization of paper mill wastes in their agriculture.