With a 270 million Indonesian population, domestic wastewater is one of the major contributors to wastewater generated from human activities. This review aimed to give an overview of the current state of domestic wastewater generation, characteristics and treatment systems in Indonesia. Overall, grey water quantity in Indonesia was 1 to 4 times higher than black water quantity, while the quantity of untreated grey water was 3 to 6 times higher than untreated black water. Parameters of concern include suspended solids, biochemical oxygen demand, chemical oxygen demand, oil and grease, nitrogen and coliforms. Our analysis shows that grey water can be a significant source of water pollution due to the large quantity and lack of treatment. In addition, black water treatment that relies mainly on on-site treatment is often inadequate due to the lack of quality control for the infrastructure, operation and maintenance. An incentive or penalty scheme to build and ensure the quality of domestic wastewater treatment is required and can be applied at the household, community or central (city) level.
Tofu factories are spread across Indonesia as tofu is a cheap source of protein and favorite food for almost all population groups. Most tofu producers are micro/small business owners. In addition to soybeans, clean water is the most important input to produce tofu curd. It will generate a large amount of wastewater and solid waste, which still contains significant amounts of easily biodegradable organic matter. There are often complaints and protests from the public about the pollution in air and water in the area from the discharged waste. Tofu producers know about this, but their limited income and capital force them to ignore the environmental issues. The potential of tofu waste treatment technologies to produce new products or clean materials that can be fed back into the production process is discussed and reviewed to ensure all input materials in the tofu process can be used optimally and efficiently in a closed-loop production process. And it could be implemented easily and economically by the factories.
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