Resty Arestya1), Herry Suseno2) dan RLM. Satrio Ari Wibowo2)
Leather industry is one of industries supporting a country’s economy which has a negative side such as waste resulted from skin processing. Fleshing process is one those producing solid waste in the form of remnants of protein and fat that is potentially causing the pollution because of waste decomposition. The processes of making organic fertilizer consist of material preparation, size reduction, pile preparation, inversion, maturation, milling, and drying under the sun. Efforts to maximize the process of making organic fertilizer were done by adding rotten rice as starter so that it could speed up the composting process in a laboratory scale. Feed quality testing is then known using physical, chemical and biological testing using marigolds plant/suring. Fertilizer was made using tannery solid waste added with (A) and without (B) rotten rice starter. Fertilizer A with 1.075% total nitrogen content using the composition of 40% cooked fleshing, 40% raw fleshing, 20% cow dung and starter 1:5 has met the requirements of SNI-09-7030-2004 (min. 0.4%). Fertilizer B with 0.9850% total nitrogen content using the composition 40% cooked
fleshing, 20% raw fleshing, 10 shaving powder, 20% cow dung and 10% WWT sludge meets the requirements of SNI-09-7030-2004 (min. 0, 4%).
Keywords: solid waste, waste treatment, organic fertilizer