Oxidation ditches for wastewater recycling and reuse for long-term sustainability—A case study

Abstract The increasing problem of wastewater management remains reliant on onsite sanitation technology, which is used by 2.7 billion people globally, primarily in developing nations, and may reach 5 billion by the end of 2030. The world’s fastest-growing cities are driven to reevaluate sustainable development goals because they deal with inadequate or nonexistent sanitation sector management. A significant area of focus in sanitation is fecal sludge and septage, which has gained popularity recently as a practical and cost-effective way to create clean, healthy cities. The fecal sludge processing process at the Keputih IPLT Surabaya starts from feces transported by trucks, the feces are dumped into measuring tanks that have been installed with bars screen at the beginning of the unit. The OD unit used to remove organic material from the supernatant fecal sludge by utilizing microorganisms. The evaluation results and recommendations for the performance of the Oxidation Ditch processing unit at the Keputih IPLT show that of the 9 design criteria that have been determined, only the MLSS parameters do not meet the design criteria. The MLSS value was obtained by testing the supernatant in the OD and the MLSS result was 1960 mg/l, ideal design criteria for an MLSS value of 3000-6000 mg/l, it is necessary to optimize the aeration system.