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Toluene mineralization by denitrification in an up flow anaerobic sludge blanket (UASB) reactor [An article from: Bioresource Technology] | Digital

by S. Martinez (Author), F.M. Cuervo-Lopez (Author), J. Gomez (Author)

List Price:

$10.95

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Available for download now

Binding:

Digital

Publisher:

Elsevier

Publication Date:

July 01, 2007

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Product Description
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: In order to examine the effect of easily degradable substrate such as acetate on toluene mineralization by denitrification, an upflow anaerobic sludge blanket (UASB) reactor in steady state was set up. The experimentation was carried out in two stages. Initially, the reactor was fed with a carbon loading rate of 250mg acetate-CL^-^1d^-^1 as electron source. Nitrate loading rate (mg NO"3^--NL^-^1d^-^1) was adjusted to obtain a constant C/N ratio of 1.4. In the second stage, five toluene-C loading rates (TLR, mg toluene-CL^-^1d^-^1), 25, 50, 75, 100 and 125, were assessed while total carbon loading rate and C/N were maintained constant at 250mgCL^-^1d^-^1 and 1.4, respectively. In so doing, acetate-C loading rate (mg acetate-CL^-^1d^-^1) was gradually substituted by toluene-C. When acetate-C was the only electron source a dissimilative denitrifying process resulted as indicated by bicarbonate yield Y"H"C"O"""3, mg HCO"3^- produced/mg carbon consumed) of 0.74+/-0.005 and denitrifying yield (Y"N"""2, mg N"2 produced/mg NO"3^--N consumed) of 0.89+/-0.042. The addition of different TLR did not affect the biological process as consumption carbon efficiency (CCE) values remained up to 95%+/-3.5 and Y"H"C"O"""3 and Y"N"""2 values were higher than 0.71+/-0.03 and 0.88+/-0.01, respectively. Toluene mineralization by denitrification in continuous culture was successfully achieved. A simple UASB denitrifying reactor system has promising applications for complete conversion of nitrate, toluene and acetate into N"2 and CO"2 with a minimal sludge production.