Effect of Agitation on Acidogenesis Stage of Two-Stage Anaerobic Digestion of Palm Oil Mill Effluent (POME) into Biogas

1st Annual Applied Science and Engineering Conference

工业技术;自然科学

Trisakti, B.^1 ; Irvan^1 ; Adipasah, H.^1 ; Taslim^1 ; Turmuzi, M.^1

Chemical Engineering Department, Faculty of Engineering, University of Sumatera Utara, Jalan Almamater Komplek, Medan

20155, Indonesia^1

关键词: Agitation rates;    Concentration of acetic acid;    Continuous stirred tank reactor;    Organic substances;    Palm oil mill effluents;    Total suspended solids;    Two-stage anaerobic digestions;    Volatile suspended solids;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/180/1/012127/pdf
DOI  :  10.1088/1757-899X/180/1/012127

来源: IOP

【 摘 要 】

The acidogenesis stage in two-stage anaerobic digestion of palm oil mill effluent (POME) was studied in a continuous stirred tank reactor (CSTR). This research investigated the effect of agitation rate on the growth of microorganisms, the degradation of organic substances, and volatile fatty acids (VFA) production and composition. Initially, the suitable loading up was determined by varying the HRT 6.7, 5.0, and 4.0 days in a 2 L CSTR with agitation rate 50 rpm, pH 6.0 ± 0.2, at room temperature. Next, effect of agitation on the process was determined by varying agitation rate at 25, 50, 100, and 200 rpm. Analysis of total solids (TS), volatile solids (VS), total suspended solids (TSS), volatile suspended solids (VSS), chemical oxygen demand (COD), and volatile fatty acids (VFA) were conducted in order to study the growth of microorganisms and their abilities in converting organic compound to produce VFA. The highest growth of microorganisms was achieved at HRT 4.0 day with microorganism concentration was 20.62 mg VSS/L and COD reduction was 15.7%. The highest production of total VFA achieved was 5,766.61 mg/L mg/L at agitation rate 200 rpm, with concentration of acetic acid, propionic acid and butyric acid were 1,889.23; 1,161.43; and 2,725.95 mg/L, respectively. While degradation VS and COD were 16.61 and 38.79%.