The Effect on Bifurcation of Acidogenic and Methanogenic Microorganism in a Compartmentalized Anaerobic Migrating Blanket Reactor
C. Aruna1, B. Asha2
1C.Aruna, PG Scholar, Department of Civil Engineering, Annamalai University, Annamalai Nagar (Tamil Nadu), India.
2B.Asha, Assistant Professor, Department of Civil Engineering, Annamalai University, Annamalai Nagar (Tamil Nadu), India.
Manuscript received on 25 May 2019 | Revised Manuscript received on 03 June 2019 | Manuscript Published on 22 June 2019 | PP: 91-95 | Volume-8 Issue-3S, February 2019 | Retrieval Number: C10180283S19/19©BEIESP
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Abstract: A laboratory scale experimental setup was performed to develop a compartmentalized Anaerobic Migrating Blanket Reactor (AMBR) for treating an institutional wastewater. Each compartment has a volume of 14.55 litres. Temperature of the reactor was maintained under mesophilic range. The reactor was accomplished with both suspended and attached growth processes. The high concentration of VFA during anaerobic process can inhibit the methanogenic activity. The pH level of each compartment was analysed. The influence of pH for the growth of acidogenic and methanogenic organisms with respect to the reduction of organic substance was analysed. The entire experimental work was carried out with the Hydraulic Retention Times of 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 5.0 and 6.0 days with an average influent Chemical Oxidation Demand of 890 mg/l. At all the phases of HRT the first two compartments, the VFA concentration was higher due to the acid accumulation in the reactor and dampen pH level that inhibits the hydrolysis and acidogenic phase. Declined level of pH in the second compartment was due to the production of acetic acids and acetate during the digestion process. The anaerobic path way from the first to fifth compartment in terms of COD reduction was estimated due to the influence of pH. The methanogenic community for metabolism was hampered due to the lower level of pH in the first two compartments viz 6.7 and 5.9. The minimum COD removal efficiency and biogas production was attained in the first two compartments. The maximum percentage COD removal efficiency was achieved at 94.25% with a HRT of 5.0 days in the final compartment. The incremental range of pH in the fourth and fifth compartment indicated that the metabolism process was in methanogenic state. The results of this experimental study showed the intense effect on VFA synthesis in the AMBR.
Keywords: Acidogenesis, Anaerobic Migrating Blanket Reactor, Chemical Oxidation Demand, Hydraulic Retention Time, Methanogenesis, Ph, Volatile Fatty Acids.
Scope of the Article: Civil and Environmental Engineering