Redesigning the Wastewater Treatment Plant for the Tofu Industry in Ledok Kulon Village, Bojonegoro Regency

Currently, the wastewater treatment plant (WWTP) for the tofu industry in Ledok Kulon Village, Bojonegoro Regency uses an anaerobic-aerobic-anaerobic system. However, treated wastewater quality is still over maximum standard. To rectify this, the objective of the study was to technically improve the WWTP so that the treated wastewater could comply with the required quality standards for disposal into the environment. This was achieved without increasing the capacity of the WWTP by changing the function of each unit and modifying the flow patterns of the system. Additionally, the treatment system was altered from an anaerobic-aerobic-anaerobic to an anaerobic-aerobic system. Consequently, the WWTP redesigning calculations showed that the levels of BOD, COD, and TSS produced were 9.65 mg/L, 61.23 mg/L, and 2.16 mg/L, respectively, which met the required quality standards.