AI Article Synopsis
- A study was conducted on a pilot-scale upflow anaerobic sludge blanket (UASB) reactor using flocculent sludge to treat corn-ethanol wastewater over a period of 52 days, focusing on its performance and microbial community.
- The wastewater had notable characteristics, including varying levels of Chemical Oxygen Demand (CODCr) and ammonia, and the UASB started effectively at specific hydraulic loading and volatile fatty acid-to-alkalinity ratios.
- After 48 days, the reactor demonstrated high gas production and a substantial volumetric loading rate, with the microbial community, particularly Methanosaeta and aceticlastic methanogens, contributing to its resilience against sudden changes in loading levels.
Article Abstract
The performance and microbial community structure of a pilot-scale upflow anaerobic sludge blanket (UASB) reactor inoculated with flocculent sludge were investigated over 52 days. The characteristics of corn-ethanol wastewater were as follows: CODCr, 1,050-4,970 mg l(-1); ammonia, 14-298 mg l(-1); and alkalinity, 332-2,867 mg l(-1). The UASB could start up smoothly with a hydraulic loading rate lower than 180 l h(-1) and a ratio of volatile fatty acid versus alkalinity between 0.04 and 0.48. The maximum gas production rate was 432 l h(-1) and the highest volumetric loading rate of 7.2 kg m(-3) day(-1) was obtained after 48 days. The 1 mm granules could form a complex network and were composed of many Methanosaeta. Aceticlastic methanogens served as a dominant methanogenic group, which accounted for the relatively high resistance to shock loading.
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| http://dx.doi.org/10.1007/s10529-014-1748-2 | DOI Listing |
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