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Anaerobic Treatment of Palm Oil Mill Effluent in Pilot-Scale Anaerobic EGSB Reactor.

Wang J, Mahmood Q, Qiu JP, Li YS, Chang YS, Li XD - Biomed Res Int (2015)

Bottom Line: Setting HRT at 9.8 d, the anaerobic EGSB reactors reduced COD from 71179 mg/L to 12341 mg/L and recycled half of sludge by a dissolved air flotation (DAF).Bacilli and small coccid bacteria were the dominant microbial species of the reactor.The reactor produced 27.65 m(3) of biogas per m(3) of POME which was utilized for electricity generation.

View Article: PubMed Central - PubMed

Affiliation: College of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
Large volumes of untreated palm oil mill effluent (POME) pose threat to aquatic environment due to the presence of very high organic content. The present investigation involved two pilot-scale anaerobic expanded granular sludge bed (EGSB) reactors, continuously operated for 1 year to treat POME. Setting HRT at 9.8 d, the anaerobic EGSB reactors reduced COD from 71179 mg/L to 12341 mg/L and recycled half of sludge by a dissolved air flotation (DAF). The average effluent COD was 3587 mg/L with the consistent COD removal efficiency of 94.89%. Adding cationic polymer (PAM) dose of 30 mg/L to DAF unit and recycling its half of sludge caused granulation of anaerobic sludge. Bacilli and small coccid bacteria were the dominant microbial species of the reactor. The reactor produced 27.65 m(3) of biogas per m(3) of POME which was utilized for electricity generation.

No MeSH data available.


Related in: MedlinePlus

Scanning electron micrographs (SEM) of granular sludge from EGSB showing the predominant bacterial groups: (a) morphology of an overall anaerobic granules (65x magnification); (b) the exterior of anaerobic granules (5,000x magnification); (c) the cavities on the exterior of anaerobic granules (7,500x magnification); (d) the inner of anaerobic granules (7,500x magnification); (e) the inner structure of anaerobic granules (15,000x magnification); (f) the inner of anaerobic granules (10,000x magnification).
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fig3: Scanning electron micrographs (SEM) of granular sludge from EGSB showing the predominant bacterial groups: (a) morphology of an overall anaerobic granules (65x magnification); (b) the exterior of anaerobic granules (5,000x magnification); (c) the cavities on the exterior of anaerobic granules (7,500x magnification); (d) the inner of anaerobic granules (7,500x magnification); (e) the inner structure of anaerobic granules (15,000x magnification); (f) the inner of anaerobic granules (10,000x magnification).

Mentions: The scanning electron micrographs (SEM) of the granular sludge from these two EGSB reactors were presented in Figure 3. The granules had an average diameter of 1–3.5 mm. The ultrastructure of the granules revealed that the bacterial species of the granules were morphologically different from those at the surface. A stratified structure appeared in the bacterial cells present within the granules. It appeared that heterogeneous long rod-shaped and filamentous bacteria dominated the outer layer (Figures 3(b) and 3(c)), while the interior of granules comprised rod-shaped and little coccid bacteria (Figures 3(d), 3(e), and 3(f)). Three cavities were observed on the exterior of the granules as shown in Figure 3(c). Similar phenomena were also observed during POME treatment in an up-flow anaerobic sludge-fixed film bioreactor [10] and a pilot-scale EGSB [5].


Anaerobic Treatment of Palm Oil Mill Effluent in Pilot-Scale Anaerobic EGSB Reactor.

Wang J, Mahmood Q, Qiu JP, Li YS, Chang YS, Li XD - Biomed Res Int (2015)

Scanning electron micrographs (SEM) of granular sludge from EGSB showing the predominant bacterial groups: (a) morphology of an overall anaerobic granules (65x magnification); (b) the exterior of anaerobic granules (5,000x magnification); (c) the cavities on the exterior of anaerobic granules (7,500x magnification); (d) the inner of anaerobic granules (7,500x magnification); (e) the inner structure of anaerobic granules (15,000x magnification); (f) the inner of anaerobic granules (10,000x magnification).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4488516&req=5

fig3: Scanning electron micrographs (SEM) of granular sludge from EGSB showing the predominant bacterial groups: (a) morphology of an overall anaerobic granules (65x magnification); (b) the exterior of anaerobic granules (5,000x magnification); (c) the cavities on the exterior of anaerobic granules (7,500x magnification); (d) the inner of anaerobic granules (7,500x magnification); (e) the inner structure of anaerobic granules (15,000x magnification); (f) the inner of anaerobic granules (10,000x magnification).
Mentions: The scanning electron micrographs (SEM) of the granular sludge from these two EGSB reactors were presented in Figure 3. The granules had an average diameter of 1–3.5 mm. The ultrastructure of the granules revealed that the bacterial species of the granules were morphologically different from those at the surface. A stratified structure appeared in the bacterial cells present within the granules. It appeared that heterogeneous long rod-shaped and filamentous bacteria dominated the outer layer (Figures 3(b) and 3(c)), while the interior of granules comprised rod-shaped and little coccid bacteria (Figures 3(d), 3(e), and 3(f)). Three cavities were observed on the exterior of the granules as shown in Figure 3(c). Similar phenomena were also observed during POME treatment in an up-flow anaerobic sludge-fixed film bioreactor [10] and a pilot-scale EGSB [5].

Bottom Line: Setting HRT at 9.8 d, the anaerobic EGSB reactors reduced COD from 71179 mg/L to 12341 mg/L and recycled half of sludge by a dissolved air flotation (DAF).Bacilli and small coccid bacteria were the dominant microbial species of the reactor.The reactor produced 27.65 m(3) of biogas per m(3) of POME which was utilized for electricity generation.

View Article: PubMed Central - PubMed

Affiliation: College of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
Large volumes of untreated palm oil mill effluent (POME) pose threat to aquatic environment due to the presence of very high organic content. The present investigation involved two pilot-scale anaerobic expanded granular sludge bed (EGSB) reactors, continuously operated for 1 year to treat POME. Setting HRT at 9.8 d, the anaerobic EGSB reactors reduced COD from 71179 mg/L to 12341 mg/L and recycled half of sludge by a dissolved air flotation (DAF). The average effluent COD was 3587 mg/L with the consistent COD removal efficiency of 94.89%. Adding cationic polymer (PAM) dose of 30 mg/L to DAF unit and recycling its half of sludge caused granulation of anaerobic sludge. Bacilli and small coccid bacteria were the dominant microbial species of the reactor. The reactor produced 27.65 m(3) of biogas per m(3) of POME which was utilized for electricity generation.

No MeSH data available.


Related in: MedlinePlus