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the raw water from river to the reactor continuously with various Hydraulic RetentionÂ Time. Samples of raw water and treated water were taken daily and analyzed for pH,
Total Suspended Solid (TSS), Organic matter, Ammonia nitrogen and Detergent (MBAS).Â The results showed that performance of biofiltration system decreaed due to shorteningÂ Hydraulic Retention Times (HRT). The longer HRT caused bigger volume of biofiltrationÂ tank. Therefore, this study suggests that the optimum Hydraulics retention time is 1 hr.Â In this HRT, the treated water quality were 7.2 for pH, 40 mg/l for TSS, 10,7 mg/l forÂ organic matter, 0.35 mg/l for ammonia nitrogen and 0.1 mg/l for MBAS. These results
comply with the Regulation No. 582 year 1995 for raw drinking water quality (class B).
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