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Background: Sustainable Development Goals (SDGs) in the environmental sector, namely targeting the community to achieve universal access to clean water and sanitation by 2030 can be met. So it is necessary (WWTP) with considerations of cleanliness, health, and safety. Objective: to review the existence of WWTPs in Indonesia, the quality of existing WWTPs in Indonesia, and the cost of treating WWTPs in Indonesia. Method: comprehensive literature review. The data source used comes from Google Scholar with a time span of 2017-2021. The articles used after the screening process were 17 articles Results:. only 15 provinces have IPAL services, and only 10 provinces have been studied. The quality of WWTP from the parameters studied still does not meet the quality standards set, the cost of WWTP maintenance is relatively cheap. The recommendation given is that it is hoped that WWTP planning will be carried out in locations where there is no WWTP, in order to reduce environmental pollution. It is necessary to check the WWTP equipment at least once every 1-3 months so that the content in the waste is treated optimally and reduces the negative impact on the river. The monthly fee can be increased, but the local government must also supervise the operation of the WWTP. Conclusion: Based on previous research, the BOD and COD parameters still do not meet the quality standards. The cost of WWTP treatment paid by residents with a monthly fee system is still affordable, but the wastewater produced still does not meet the quality standards. [ABSTRACT FROM AUTHOR]

Background: The problem in the small industry of making tempe is that the residual waste from its production is directly discharged into the river without any prior processing. If done continuously will cause various problems to the surrounding environment. Objective: To analyze changes in turbidity, pH, BOD, COD, TSS in the tempewastewater treatment process. Methods: This research is a pre-experimental research. The sample size used in this study was 40 liters of tempeh liquid waste left over from production. The number of samples used in this study was 3 times including before filtration 1 time and after filtration 2 times. Results:. The results showed that turbidity decreased from the value before filtration 1153 NTU to 104 NTU (90.98%) in the second filtration. The pH increased from the value before filtration 4.36 to 9.07 (51.9%) in the second filtration. BOD decreased from the value before filtration 37843 mg/L to 4099 mg/L (89.17%) in the second filtration. COD decreased from the value before filtration 90597 mg/L to 9928 mg/L (89.04%) in the second filtration. TSS decreased from the pre-filtration value of 6,580 mg/L to 364.0 mg/L (94.46%) in the second filtration. Conclusion: There was a change in turbidity, pH, BOD, COD, TSS in the tempe wastewater treatment process. Slow sand filter combined with activated carbon has proven to be an alternative for tempe wastewater treatment. Suggestions that can be given are the role of the government to carry out monitoring by the local DLH to home industries, and industrial owners are advised to make WWTPs in order to reduce the pollution load. [ABSTRACT FROM AUTHOR]