Feng Liu

Publications (2)0.75 Total impact

• Article: Continuous biohydrogen production from diluted molasses in an anaerobic contact reactor

  Sheng Chang, Jianzheng Li, Feng Liu
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  ABSTRACT: An anaerobic contact reactor (ACR) system comprising a continuous flow stirred tank reactor (CSTR) with settler to decouple the hydraulic retention time (HRT) from solids retention time (SRT) was developed for fermentative hydrogen production from diluted molasses by mixed microbial cultures. The ACR was operated at various volumetric loading rates (VLRs) of 20–44 kgCOD·m−3·d−1 with constant HRT of 6 h under mesophilic conditions of 35°C. The SRT was maintained at about 46–50 h in the system. At the initial VLR of 20 kgCOD·m−3·d−1, the hydrogen production rate dropped from 22.6 to 1.58 L·d−1 as the hydrogen was consumed by the hydrogentrophic methanogen. After increasing the VLR to 28 kgCOD·m−3·d−1 and discharging the sludge for 6 consecutive times, the hydrogentrophic methanogens were eliminated, and the hydrogen content reached 36.4%. As the VLR was increased to 44 kgCOD·m−3·d−1, the hydrogen production rate and hydrogen yield increased to 42.1 L·d−1 and 1.40 mol H2·molglucose-consumed-1, respectively. The results showed that a stable ethanoltype fermentation that favored hydrogen production in the reactor was thus established with the sludge loading rate (SLR) of 2.0–2.5 kgCOD·kgMLVSS−1·d−1. It was found that the ethanol increased more than other liquid fermentation products, and the ethanol/acetic acid (mol/mol) ratio increased from 1.27 to 2.45 when the VLR increased from 28 to 44 kgCOD·m−3·d−1, whereas the hydrogen composition decreased from 40.4% to 36.4%. The results suggested that the anaerobic contact reactor was a promising bioprocess for fermentative hydrogen production. Keywordsfermentative hydrogen production–anaerobic contact reactor (ACR)–sludge loading rate (SLR)–butyric acid-type fermentation–ethanol-type fermentation
  Frontiers of Environmental Science & Engineering in China 04/2012; 5(1):140-148. · 0.75 Impact Factor
• Conference Proceeding: Performance and Characteristics of Anaerobic Baffled Reactor Treating Soybean Wastewater

  Sheng Chang, Jianzheng Li, Feng Liu, Gefu Zhu
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  ABSTRACT: The performance and characteristic of a four compartment anaerobic baffled reactor (ABR) treating soybean wastewater were investigated. The effective volume of the reactor is 28 L. After inoculated with aerobic activated sludge of 18.0 g-L^-1 in the term of mixed liquor volatile suspend solid (MLVSS), the ABR started up at an organic loading rate (OLR) of 1.2 kg-(m³-d)^-1 with an influent COD of 2000 mg-L^-1 and a hydraulic retention time (HRT) of 39.5 hrs under a temperature of (35plusmn1)degC. The ABR reached a steady state after 23 days for the first time with a COD removal of 96%. Since the 32^nd day, the OLR increased to 6.0 kg-(m³-d)^-1 step by step through increasing COD of the feed at the same HRT 39.5 hrs and temperature (35plusmn1)degC. Based on the analysis of liquid fermentation products, namely volatile fatty acids (VFAs), the microorganism communities showed an observable difference among the four compartments. The phase separation of different microorganism communities made the ABR have good operation stability to shock loads. When the OLR increased to 3.0, and then to 4.8 and to 6.0 kg-(m³-d)^-1, the COD removal could always keep above 97%.
  Bioinformatics and Biomedical Engineering, 2008. ICBBE 2008. The 2nd International Conference on; 06/2008