S. Sugito, R. Ratnawati
The increasing need for organic fertilizers in Indonesia along with the fulfilment of agricultural needs. On the other hand, the raw material of organic fertilizer is abundant and not yet utilized, one of which is Slaughterhouse Solid Waste (SSW). The objective of this study were to produce the quality of organic fertilizer that meets regulation of the Minister of Agriculture Decree No. 70 Year 2011 about Organic Fertilizer, Biological Fertilizer, and Land Improvement. The composting process was done using 20 kg of Madura's cow rumen content and rice straw was placed in each reactor during 50 days. Raw materials were consisted of three variations in composting, i.e., 1) 60% rumen content waste and 40% rice straw, 2) 50% rumen content waste and 50% rice straw, 3) 40% rumen content waste and 60% rice straw. Eight standing reactors of 120 L capacity were used in this research. Each reactor was equipped with a leachate outlet at the bottom, slits for aeration, and sampling. The measured parameters were C/N ratio, macro nutrient (phosphor and kalium), temperature, dan pH value. The results showed that the optimum composition of rumen content waste with addition of rice straw was 40%:60%. In this reactor, C/N ratio was decreased from 15.91 to 13.25, macro nutrients in P concentration increased from 4.27 to 6.12, K concentration gradually increased from 5.46 to 7.55, temperature range was 29.80 oC-33.70 oC, and pH values slightly fluctuated from 6.71 to 6.93. © 2020 Published under licence by IOP Publishing Ltd.
Department of Environmental Engineering, Universitas PGRI Adi Buana, Dukuh Menanggal XII, Surabaya, 60234, Indonesia
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