Compost quality analysis of various variations in green biomass and sawdust with the hot composting method

The household-scale composting process can use the basket or Takakura method. Another concept, Hot composting, is a method that prioritizes the comparison of the balance between wet waste and dry waste in composting. This study uses both methods. The source of wet waste or green biomass comes from kitchen waste while the source of dry or brown waste comes from fine sawdust. The composting process is carried out in a basket with a household scale with an aerobic process and the addition of bio activators of stale rice moles. There are several important parameters related to the quality of compost including organic matter and pH. Organic material is related to its role in improving soil structure physically, chemically, and biologically. Whereas pH is related to the availability of nutrients in the soil and the dissolution of these nutrients to be absorbed by plants. Methods: This research is a quasi-experimental. There are 3 variations in the ratio of green biomass and sawdust in this study, namely 3: 3, 3: 4, and 3: 2. The variable observed in this study is the quality of compost produced. Organic material and compost pH are compared with Compost Quality Standards (SNI 19-7030-2004). The other studies are physical characteristics such as texture, composting time, and shrinkage. Results: There is a significant difference in compost organic matter content among the three variations of sawdust and green biomass (p value = 0,000). There is a significant difference in compost pH between the three variations of sawdust and green biomass (p value = 0,000). Conclusion: Compost with sawdust and green biomass ratios (3: 3) has the lowest organic material content of 29.12%, and the highest is 30.75%, fulfilling the requirements based on SNI 19-7030-2004. Compost with sawdust and green biomass ratios (3: 2) shows a range of pH from 7.32 to 7.72, meeting the requirements based on SNI 19-7030-2004. Depreciation of waste into compost is in the range of 42.86 to 53.33%.