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Waste Manag. 2014 Jun;34(6):1035-40. doi: 10.1016/j.wasman.2013.10.012. Epub 2013 Nov 22.

Ultrasound pretreatment of filamentous algal biomass for enhanced biogas production.

Author information

  • 1Department of Civil and Environmental System Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 143-701, Republic of Korea.
  • 2EPS Solution Ltd., 126-1 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do 431-755, Republic of Korea.
  • 3Department of Civil and Environmental System Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 143-701, Republic of Korea. Electronic address: kypark@konkuk.ac.kr.

Abstract

The filamentous alga Hydrodictyon reticulatum harvested from a bench-scale wastewater treatment pond was used to evaluate biogas production after ultrasound pretreatment. The effects of ultrasound pretreatment at a range of 10-5000 J/mL were tested with harvested H. reticulatum. Cell disruption by ultrasound was successful and showed a higher degree of disintegration at a higher applied energy. The range of 10-5000 J/mL ultrasound was able to disintegrated H. reticulatum and the soluble COD was increased from 250 mg/L to 1000 mg/L at 2500 J/mL. The disintegrated algal biomass was digested for biogas production in batch experiments. Both cumulative gas generation and volatile solids reduction data were obtained during the digestion. Cell disintegration due to ultrasound pretreatment increased the specific biogas production and degradation rates. Using the ultrasound approach, the specific methane production at a dose of 40 J/mL increased up to 384 mL/g-VS fed that was 2.3 times higher than the untreated sample. For disintegrated samples, the volatile solids reduction was greater with increased energy input, and the degradation increased slightly to 67% at a dose of 50 J/mL. The results also indicate that disintegration of the algal cells is the essential step for efficient anaerobic digestion of algal biomass.

KEYWORDS:

Algae; Biogas production; Hydrodictyon reticulatum; Pretreatment; Ultrasound

PMID:
24269061
DOI:
10.1016/j.wasman.2013.10.012
[PubMed - indexed for MEDLINE]
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