The compost obtained from composting organic fraction of Municipal solid waste, Paper & Pulp mill sludge and saw dust using different initial mix ratios (1:3, 1:6, 1:9) was used to evaluate phytotoxicity of green gram (Vigna radiata) using a seed germination method. The tests were repeated for the compost obtained from organic fraction of MSW and saw dust without the addition of sludge. The control germination test was carried out using deionised water. The results showed that composting generally reduced the phytotoxicity of the mixtures. A germination index was the highest in the mix ratio of 1:9 in the compost obtained from the addition of paper & pulp mill sludge and a germination index was the highest in the mix ratio of 1:6 in the compost obtained without the addition of sludge. The germination percentage, germination index and vigour index values were relatively higher in the compost obtained with the addition of paper & pulp mill sludge. The vigour index was found to be maximal in the mix ratio of 1:3 from the compost obtained with the addition of sludge.

DOI: http://dx.doi.org/10.5755/j01.erem.59.1.922

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Milk processing consumes a large amount of water and generates 6-10 liters of effluent per liter of milk processed. An effluent volume is approximately four times the volume of processed milk. Since the pollutants generated by industry are great losses of production, improvements in production efficiency are recommended to reduce pollutant loads. In this research a series of experimental studies were conducted with regard to bioconversion of organic fraction of municipal solid waste along with dairy waste water at different C/N ratios. About 50 kg of shredded waste containing dairy waste water, saw dust, and organic fraction of municipal solid waste was placed in static piles of different proportions and 500 ml of effective microorganisms was added to them. The variation in physical and chemical parameters was monitored throughout the process. Results indicate that co composting of dairy waste water with municipal solid waste produces compost that is more stable and homogenous and can be effectively used as soil conditioner.