Determination of the Optimum Hydraulic Retention Time in Two-Stage Anaerobic Fluidized Bed Bioreactor for Landfill Leachate Treatment

Abstract

Leachate in Indonesian landfill sites poses a high risk to the surrounding environment should there be leakage in the accumulating ponds. Anaerobic digestion is an attractive option to clean up leachate, mostly due to the affordability of its operational cost. To enhance the efficiency of leachate digestion, anaerobic microbes were immobilized on the surface of natural zeolite powder. The powder was fluidized in a mesophilic anaerobic fluidized bed reactor (AFBR) for more stable biofilm formation. The AFBR scheme was split into two stages, with the first stage dominated by the acidogenic process and the second stage dominated by the methanogenic process. The dominating microbes in each stage were provoked by pH control to maintain the first stage acidic at pH 5-5.5 and the second stage neutral at pH 7-7.5. The first stage was run at five different hydraulic retention times (HRTs), while the second stage was run at three different HRTs to determine the optimum HRT for each stage. For acidogenic AFBR with HRTs of 5 days and 2.5 days, the VFA concentration profile increased for a longer period compared to the other HRTs. The COD removal efficiency at steady state was almost identical for all HRTs. For methanogenic AFBR, all three HRTs showed an identical rate of biogas formation at steady state.

The Impact of Hydraulic Retention Time on the Biomethane Production from Palm Oil Mill Effluent (POME) in Two-Stage Anaerobic Fluidized Bed Reactor

“…The maximum percentage of sCOD removal in this work was 96.06% at 20 days of HRT. This result was higher compared to a similar experiment using double stage AFBR with one-time feeding/day, which was about 75% (Prasetyo et al 2017). Intermittent feeding system was applied in this work to maximize the contact time between the microorganism and substrate.…”

“…The stable concentration of VFA in the effluent (200-500 mg/L) for all HRTs was defined as the minimum substrate concentration for the microorganism to survive. Methanogenic cells required specific minimum substrate concentrations to live (Prasetyo et al 2017). When this minimum concentration was reached, the production of biomethane ceased because the substrate was all used for cell maintenance.…”

Influence of Nutrient Impregnated into Zeolite Addition on Anaerobic Digestion of Palm Oil Mill Effluent (POME)

“…Anaerobic digestion has considerable advantages during the process such as minimum sludge production, less energy demand, no unpleasant odor and low microorganism nutrient requirements [2]. It implied that the level of COD and BOD in POME was also reduced as the biogas was produced.…”