EVALUATION OF EFFLUENT QUALITY AT THE OUTLET OF COMMUNAL WWTP BASED ON PHYSICAL AND CHEMICAL PARAMETERS Siti Siwi Wulandari (1), Tri Retnaningsih Soeprobowati (2), and Kismartini (3)
1) Master of Environmental Science, School of Postgraduate, Diponegoro University- email: sitisiwiwulandari[at]gmail.com
2) Biology Departement, Faculty of Science and Mathematics, School of Postgraduate, Diponegoro University- Cluster of Paleolimnology (Cpalim)
3) Department of Public Administration, Faculty of Social and Political Sciences, Diponegoro University
Abstract
Household activities ranging from sanitation and cooking to business produce waste with a high content of organic and inorganic compounds and have the opportunity to pollute the environment. Communal Wastewater Treatment Plant (WWTP) is an alternative technology that could treat household waste of grey and black water to be safe when discharged into the atmosphere. This study was conducted at one of the Communal WWTPs in Salatiga City, Indonesia, which was built on the banks of the Cengek River and uses the river to discharge effluent from the treatment of household waste. Sample testing was conducted using the grab sampling method and was supported by survey results to 7 key informants: Communal WWTP managers, users, and government staff. Based on the results of physical parameter testing, the measurement values of temperature, pH, conductivity, TDS, DO, and O2 were 26.3oC, 6.99, 1058 microsiemens/cm, 584.33 mg/L, 0.00 mg/L and 0.00 mg/L. The measurement results of chemical parameters for TN, TP, Nitrate, TSS, COD and BOD were 11.33 mg/L, 51.10 mg/L, 0.66 mg/L, 18 mg/L, 101.47 mg/L, and 21.72 mg/L with concentrations of TP, COD, and BOD exceeding river quality standards according to Government Regulation of the Republic of Indonesia 22/2021 Regarding the Implementation of Environmental Protection and Management. Strategies that could be carried out to overcome excessive pollutant concentrations are routine monitoring and maintenance of the communal WWTP, monitoring the flowing quality of the communal WWTP, and ensuring that household waste is treated in the communal basin by the established SOP.
