Kinetic analysis of palm oil mill wastewater treatment by a modified anaerobic baffled reactor

Influential Parameters on Biomethane Generation in Anaerobic Wastewater Treatment Plants

“…In order to maintain high levels of biomass inside the digester, several strategies have been adopted by many researchers. Among those, sludge recycling (Visser et al, 1993;Setiadi et al, 1996;Bae et al, 1998;Faisal & Unno, 2001;Busu et al, 2010), is probably the simplest strategy to increase the biomass concentration in the digester. Busu et al conducted a simple experiment on anaerobic treatment of POME and the sludge was recycled at 6 m 3 /d with different feeding strategies.…”

“…Thus based on these two studies on POME, it could be concluded that by increasing the sludge recycling rate during treatment at higher OLRs, the treatment process maintained stable with high COD removal efficiency and satisfactory methane production. Using the same substrate but different digester designs, Setiadi et al, Faisal and Unno and Najafpour et al revealed that sludge recycling strategy is compulsory to ensure system stability by maintaining pH higher than 6.8 without alkalinity supplementation, eliminating high organic over loading and supplying alkalinity by blending the fresh feed and recycled stream (Setiadi et al, 1996;Faisal & Unno, 2001;. Setiadi et al conducted a simple study on the effects of sludge recycling on the baffled system stability and found out that a recycle system of more than 15 times of the fresh feed was required in order to maintain the system's pH higher than 6.8 without alkalinity supplementation and the implementation of the recycle system was an effective means to reduce alkalinity requirements (Setiadi et al, 1996).…”

The developments of anaerobic baffled reactor for wastewater treatment: A review

“…In order to avoid or at least decrease clogging and sludge washout of biomass in attached form, enhance the bacterial activity together with better mixing to ensure high-rate contact between the cells and their substrate (Faisal and Unno, 2001), the carrier anaerobic baffled reactor (CABR) was developed to treat sewage at 28 ± 1°C. It combines the advantages of ABR with the characteristics of biofilm reactor and is a suitable technology for decentralized domestic sewage treatment for rural areas of China (Feng et al, 2008).…”

“…The stability was achieved by the recycling of 30 times feed flow rate. By recycling the effluent to the influent, the alkalinity in the effluent was recovered (Faisal and Unno, 2001).…”

“…A kinetic model for substrate utilization and methane production in anaerobic digestion of complex palm oil mill wastewater in MABR is discussed by assuming to take place in three stages: (1) extracellular hydrolysis of complex wastewater into soluble substrates; (2) transport of the solubilized substrates into cells and (3) utilization of the soluble substrates for cell growth and product formation. Based on the experimental data, the biokinetic parameters were evaluated, which represented the behavior of reactor very well (Faisal and Unno, 2001).…”