Study of Tofu Industry Wastewater Treatment in Kediri, East Java, Indonesia
L S Gavidiknas and Ipung Fitri Purwanti
Department of Environmental Engineering
Faculty of Civil, Environmental, and Geo Engineering
Institut Teknologi Sepuluh Nopember
Abstract
One of the developing industries in Kediri is the tofu industry with approximately 121 industries in 2018. The location of the tofu industry is spread in several villages in Kediri. The development of the tofu industry is followed by the problem of wastewater effluent. According to the Kediri Environment Office, only 1 tofu industry had a permit of wastewater management in 2018, another has wastewater treatment but did not have permits and the rest did not have wastewater treatment. The Government of Kediri has not monitored the tofu wastewater maximally yet, so that the waste has a potential to cause pollution to water bodies. The aim of this study was to design a Waste Water Treatment Plant (WWTP) as an alternative to solve the tofu wastewater problem in Kediri. In this study, step of design was started by collecting data including tofu industry categories, determining alternatives of WWTP process, designing WWTP for factories with a production capacity of more than 200 kg/day and less than 200 kg/day, technical drawing, and calculating the costs required for the construction and operation of WWTP. Based on the design, the tofu WWTP consists of neutralization tank, anaerobic digester, and anaerobic filter. The processing unit has the advantage of being able to reduce potentially environmental pollution and provide benefits in the form of biogas from the anaerobic process. The investment fund for a WWTP with a production capacity of less than 200kg/day is IDR 128,158,000 while for a production capacity of more than 200kg/day requires an investment fund of IDR 378,376,000.
Keywords: Wastewater treatment
Topic: Industrial and Hazardous Waste Management