The effectiveness of composter at the integrated waste treatment plant in the campus of engineering faculty Hasanuddin University

Abstract

The weight of domestic solid waste generation at the Faculty of Engineering of Hasanuddin University is 62.60 kg day−1. The percentage of organic waste generation is 28%, so the weight of organic waste generation on this campus is 17.66 kg. One way to utilize organic waste is by composting. There are three methods for composting, including (1) aerobic methods, (2) anaerobic methods, and (3) combining aerobic and anaerobic methods. The method used in measuring waste generation is the measurement of waste generation in ten buildings located on this campus for eight consecutive days, according to the procedures in the Indonesian National Standard. The data used in this study include primary and secondary data. Primary data in this study are the results of measurements of weight, volume, and composition of waste. Whereas, secondary data in this study is the number of the campus population of the Faculty of Engineering. From the primary and secondary data, composter space requirements, effectiveness, and investment evaluation through the Benefit-Cost Ratio of the three composting methods can be calculated. From the calculation results, the space requirements for aerobic composter are 16.08 m2, 16.08 m2 for the anaerobic composter, and 25.61 m2 for combination aerobic and anaerobic composter. The effectiveness values for each composter method were 98.7%, 98.47%, and 98.9% for aerobic, anaerobic composters, and the combination of the two, respectively. Furthermore, the value of the Benefit-Cost Ratio for each composter method is 1.20, 1.38, and 1.85 for aerobic, anaerobic composters, and the combination of the two, respectively.