Mohamed Afifi and Ahmed Mohy Eldin( 2020). Biochemical Evaluation and Maturity Criteria during Fish Waste and Olive Mill
Mixed Composting
Int. J. Environ., 9(1):26 -49, 2020 EISSN: 2706-7939 ISSN: 2077-4508
Abstract: This study introduced two unusual local wastes including fish wastes and olive mill into traditional compost structure of rice straw and cattle dung in permutations and combinations to form three types of heaps (A), (B) and (C). The composting process was investigated following up variable parameters in correlation to enzymatic activities in each heap which was of great feasibility to evaluate heap state. C/N ratio, organic matter content and humification parameters were investigated, while the influence of coinciding weathering conditions on temperature and humidity in heaps were evaluated. In their mature state, heavy metal ion concentrations were way down than many worldwide standards and those embedding fish wastes were found to be richer in phosphorous, potassium and zinc, with higher cation exchange capacity. Their germination indices exceeded 70%, while they were all free from parasite, nematodes, total coliforms, fecal coliforms, pathogenic Salmonella and Shigella. They were all compliant to good compost humification parameters, where compost (B) recorded the least humification index % and humification rate % while gave the highest humification degree %. Gathering fish waste with equal amounts of olive mill and rice straw in heap (B) made it the best combination constructed for compost production with the highest organic matter %, Nitrogen %, Humification degree % and germination index among other composts
Keywords: (compost, fish, olive, weather, enzymes, maturation, humification.)
