Abstract
Chemical oxygen demand (COD) in domestic wastewater can be treated using flocculation-coagulation process with addition of Oyster mushroom (Pleurotus ostreatus) in powder form as biocoagulant. The fungal cell wall of Oyster mushroom comprises of chitin that is high polyelectrolyte and can be function as an absorbent of heavy metals in wastewater. The effectiveness of flocculation-coagulation process in treating wastewater depends on dose of coagulant and mixing rate. Therefore, this study aims to determine the best combination of three variation of dose of biocoagulant which are 600 mg/l, 1000 mg/l, and 2000 mg/l and mixing rate which are 100 rpm, 125 rpm, and 150 rpm that give the most reduction of COD in the wastewater. The result indicates that the combination of 1000 mg/l of biocoagulant and 100 rpm of mixing rate were found to be the most optimum combination to treat COD in the wastewater with COD reduction of 47.7%.
Highlights
Wastewater of canteen Dean of Faculty of Engineering Diponegoro University and canteen of Electrical Engineering Diponegoro University is one of the waste water that contributes to pollution if not processed first
In the preliminary test the initial characteristics of Chemical oxygen demand (COD) value of domestic waste received a value of 399.4 mg / L for the canteen Dean of the Faculty of Engineering Faculty of Diponegoro University and 636.9 mg / L for the Diponegoro University Electrical Engineering canteen.Where both COD values exceed the existing quality standard
Engineering is higher than the value of COD in the Faculty Engineering Faculty canteen canteens
Summary
Wastewater of canteen Dean of Faculty of Engineering Diponegoro University and canteen of Electrical Engineering Diponegoro University is one of the waste water that contributes to pollution if not processed first. Contaminant sources contained in waste water canteen of Dean of Faculty of Engineering Diponegoro University and canteen Electrical Engineering Diponegoro University, among others, is pathogenic bacteria and organic and inorganic solids. That the result of pollution caused by canteen waste water make the channel become clogged, and odor and waste of processed product still not fulfill the required quality standard. The detergent or soap used in the own washing industry can cause the resulting liquid waste to contain some contaminants which, if excessive, can be harmful to the environment is COD
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