Feasibility study of a pilot-scale sewage treatment system combining an up-flow anaerobic sludge blanket (UASB) and an aerated fixed bed (AFB) reactor ... [An article from: Bioresource Technology]

This digital document is a journal article from Bioresource Technology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
A feasibility test of a 17m^3-pilot-scale sewage treatment system was carried out by continuous feeding of raw municipal sewage under ambient temperature conditions. The system consisted of a UASB and an aerated fixed bed reactor. Some of the effluent from the fixed bed reactor was returned to the UASB influent in order to provide a sulfate source. The total BOD of 148-162mgl^-^1 in the influent was reduced to a more desirable 11-25mgl^-^1 in the final effluent. The levels of methane-producing activity from acetate and H"2/CO"2 gas at 10^oC were only 2% and 0% of those at 35^oC, respectively. On the other hand, the sulfate-reducing activity levels of the UASB sludge were relatively high at 10^oC, for example, 18% for acetate and 9% for H"2/CO"2 gas, compared to the activity levels at 35^oC. Therefore, BOD oxidization by sulfate reduction in the UASB was greater than that by methane production under low temperature conditions. This sulfate-reducing activity tended to be proportional to the copy number of adenosine-5'-phosphosulfate (APS) reductase genes in DNA extracted from the sludge.