Laundry waste dominant comes from clothes softener and detergent which is one of the environmentally inhospitable material (non-biodegraduble) soit has to be processed before dumped into the waste. The basic material that use in this research is waste laundry. The purpose of this research is to decrease phosphate and surfactant content by biosand filter method which using active carbon adsorbent with ratio of mixed waste laundry and nutrition is 100%:0, 75%:25%, and 50%:50% (in % volume) by anaerobic process. The parameter that being analyzed are Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), Volatile Suspended Solid (VSS), daily pH also Phosphate and Surfactant before and after being processed anaerobically. pH for this research arranged in range 6,9-7,5. The largest volume in VSS ratio is 63,55%, COD percentage is 53,67%, phosphate percentage is 74,32%, and surfactant is 53,54%. The reduction of phosphate and surfactant value result by the present of contaminate layer (biofilm) in tank so that produce phosphate and surfactant that have been fill quality based on government regulation of the Republic Indonesia No. 82 of 2001.
The most active ingredients in laundry waste such as clothes softener and detergent are ammonium chloride, linear alkyl sulfonate (LAS), sodium dodecyl benzene sulfonate, sodium carbonate, sodium sulfate, alkylbenzene sulfonate. These materials are not biodegradable This study aims to reduce the phosphate and surfactant content with the biosand filter method which uses activated carbon as adsorbents with the laundry to nutritional waste mixtures ratio of 100%: 0, 75%: 25%, and 50%: 50% (%volume) with anaerobic process. The parameters analyzed were Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), Volatile Suspended Solid (VSS), pH everyday and Phosphate and Surfactant before and after anaerobic processes. The pH for this study is set in the range of 6.9-7.5. The largest volume was at 50%: 50% (v/v) mixture of laundry waste and nutrients obtained 76.61% TSS, 63.55% VSS, 53.67% COD, 74.32 % phosphate and 53.54% surfactant. Reduction of phosphate and surfactant values is caused by the presence of a dirty layer (biofilm) in the tank so as to produce phosphate and surfactants that have met quality standards based on the Government Regulation of the Republic of Indonesia No. 82 of 2001.
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