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• W158543419 abstract "One stage anaerobic digestion was carried out in this study where fresh leachate fromTaman Beringin Transfer Station was used as a substrate to be treated in terms ofchemical oxygen demand (COD) removal by using 10 L stirred tank reactor (STR)within period of two and three months for semi-continuous and batch anaerobictreatment processes, respectively, in which the maximum loading rate of the system wastested at 6kg COD/m3.day. Palm oil mill effluent (POME) sludge was used as aninoculum in phase 2 in order to obtain high amount of COD removal. Three experimentswere conducted in anaerobic treatment of fresh leachate until steady state was achieved,i.e. (1) no seed was added and pH and temperature were not controlled (phase1); (2)POME sludge was used as an inoculum and no pH adjustment and temperature controlwas done, fresh leachate was fed in semi-continuous mode and hydraulic retention time(HRT) 10 days was selected (phase2, run1); (3) POME sludge was used as an inoculum,pH was adjusted by using Sodium Hydroxide (NaOH) and temperature was notcontrolled and HRT 10 days was chosen (phase 2, run 2).In general, anaerobic digestion using POME seed sludge shows better efficiency in CODreduction and biochemical oxygen demand (BOD5 ) in comparison to batch process andunadjusted pH in run 1 which has been obtained in this study. The initial values for bothCOD and BOD5 of fresh leachate were extremely high compared with the stabilizedlandfill leachate. COD reduction rate for the batch (phase 1) and semi-continuousprocess (phase 2, run1 & 2) experiments were found 43, 37 and 52.7 % for period of 91,27 and 30 days, respectively. These results clearly show that using seed sludge as aninoculum as well as pH adjustment indicated better efficiency in terms of COD removalin comparison to phase 1 and run1 (unadjusted pH). Maximum reduction in BOD5occurred in run 2 (pH adjusted) with more than 90 % and 80-85 % for batch process attwo ending points; day 53 and 91, respectively.The volatile fatty acid (VFA) concentration was a rapid indicator of the reactor’sstability. High concentration of VFA indicated that the reactor was unstable. It wasapparent that as the total VFA concentration rose, the microbial population’s ability toutilize these compounds effectively was inhibited. The major acids produced were acidacetic (HAc), propionic (HPr) and butyric acids (HBu). The levels of HAc acid and HPrappeared to be the VFA species that accumulated and started to cause an imbalance inthe reactor. Acetic and propionic acid have been accumulated in run 2 and theirconcentration increased to 39 and 5 % respectively, while n-butyric decreased about46% in comparison to day 27 in run 1. All these cases show that anaerobic treatment inrun 2 has been subjected to failure.In this study it was also found that with decrease in pH, decrease in amount of CODremoval and increase in total volatile fatty acids (TVFA) was detected for run 1. TVFAwas indicated at a range of 6000-9000 mg/L and 9000-10000 mg/L for run 1 and 2,respectively, which showed despite of adjusting pH above 7 still considerableaccumulations of VFA was observed in the bioreactor. Therefore, it was concluded thatthe methanogenic population has not reached sufficient level to convert the organicacids produced from the acidogenic bacteria." @default.
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• W158543419 date "2008-01-01" @default.
• W158543419 modified "2023-09-23" @default.
• W158543419 title "Anaerobic Treatment Of Fresh Leachate From Transfer Station" @default.
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