The city of Makassar is in a coastal area. Cambayya village in Makassar is densely populated and has complex waste problems. Limited land access and narrow road access make it difficult to transport waste. People’s habit of throwing garbage into the sea leads to the accumulation of garbage on the coast of Cambayya and causes various forms of environmental pollution. A form of waste management that uses composting methods is needed to handle organic waste. This study aims to find an alternative piece of composting technology to handle waste coastal area conditions. This study uses qualitative methods, namely Analytical Hierarchy Process which is descriptive, refers to data and utilizes theory as a support. The sample is chosen using the purposive sampling method. Furthermore, the analytical hierarchy process approach and a comparison matrix involving four criteria are used, namely, economic, social, environmental and technical criteria. Thirteen sub-criteria are also used. Stakeholders from the government, community, and academia are interviewed, and direct observation and documentation (evidence in data collection during interviews) are used. This study found that communal composting technology is the most appropriate type of composting for coastal areas such as Cambayya, Makassar, because the amount of waste processed is higher than other technologies such as individual and hallway composter. This reduces the amount of waste disposed at the final waste disposal site, transforming community waste management habits, saving time, increasing the community’s income from the sale of compost.
Life is not possible without water, so we need to supply enough water to sustain well in life. Insufficiency of clean water is a major problem for urban communities today. For this reason, it is necessary to estimate the required amount of water. Thisissue will be slowly reduced by planning clean water supply in cities. This study was conducted as a case study in Palopo City, South Sulawesi. The population data is used as a reference when calculating domestic water requirements. The main objective of this study is to measure the clean water needs of community in Palopo City over a forecast period of up to 20 years. As a result of this study, the city of Palopo's water demand in 2027 is 29,510.37 m3/person/day for domestic use and 10,773.95 m3 for non-domestic use including water loss due hydrants and leaks. 31,685.72 m3/person/day for households in 2032, 13,493.76 m3/person/day for ordinary households, 33,744.08 m3/person/day for ordinary households in 2037, 13,884.27 m3/person/day for ordinary households, 35,741.65 m3/person/day for households and 14,183.00 m3/person/day for non-households. The city of Palopo's water production from multiple sources is 65,664.00 m3/day. At the end, it can be concluded that water needs in Palopo City will be quantitatively met by 2042.
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