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- Title
EFFECT OF CO-DIGESTION AND HYDRAULIC RETENTION TIME ON ANAEROBIC DIGESTION OF DECANTER CAKE AND BLOCK RUBBER WASTEWATER FOR BIOGAS PRODUCTION.
- Authors
Kaosol, Thaniya; Lerdrattanataywee, Weerapong
- Abstract
This paper aims to study biogas production using anaerobic digestion for wastewater from a block rubber factory alone, and anaerobic co-digestion for decanter cake from a palm oil mill factory together with the wastewater from the block rubber factory and the effect of the hydraulic retention time (HRT). The anaerobic co-digestion was studied using a continuously stirred tank reactor (CSTR). The experiments were conducted at a laboratory scale. The mixing time of all CSTRs was 24 h using the inner mixing devices. From a previous study using the biochemical methane potential test, the suitable ratio of the anaerobic co-digestion between the decanter cake from the palm oil mill factory and the wastewater from the block rubber factory was 5 g of the decanter cake and 200 mL of the wastewater. The experiments consisted of 4 CSTRs, namely R1, R2, R3, and R4. The R1 contained the wastewater of the block rubber factory alone at 30 d of HRT. The R2, R3, and R4 contained the same ratio of the 5 g of decanter cake and 200 mL of wastewater with 30, 20, and 10 d of HRTs, respectively. The results show that the anaerobic co-digestion provides higher biogas production than that of the anaerobic digestion using wastewater alone. The decanter cake from the palm oil mill factory can improve the biogas production potential of the wastewater from the block rubber factory using anaerobic co-digestion. The HRT of the anaerobic co-digestion shows the effect on anaerobic digestion. The 10 d of HRT can increase the organic substrates in chemical oxygen demand (COD) form. The efficiency of the COD, total solids (TS), and total volatile solids (TVS) removal was the highest value in the R4 (10 d of HRT using anaerobic co-digestion). The maximum biogas production occurred when HRT of 10 d was used on anaerobic co-digestion. The R4 provided 580-1088 mL/d of biogas production rate, 1088±27 mL/d of maximum biogas production rate, 47.5-56.8% of methane production and 56.8±2.4% of maximum methane production. The COD, TS, and TVS removal efficiencies were 99. 6-99. 8%, 87. 5-91.1%, and 89.3-95.4%, respectively in R4. The maximum COD, TS, and TVS removal efficiencies were 99. 8±4. 6%, 91. 1±3. 9%, and 95. 4±2. 9%, respectively. From the results, it can be concluded that the best HRT for the anaerobic co-digestion is the 10 d in R4.
- Subjects
BIOGAS production; ANAEROBIC digestion; RUBBER factories; DECANTERS; ANAEROBIC reactors
- Publication
Suranaree Journal of Science & Technology, 2017, Vol 24, Issue 4, p395
- ISSN
0858-849X
- Publication type
Article