Maximum Methanol-Utilizer Growth Rate: Impact of Temperature on Denitrification

Self Cite

Wastewater treatment facilities in the Chesapeake Bay watershed are focusing their attention on nitrogen removal to meet future effluent limitations of about 3-4 mg N/L. External carbon is added during denitrification to facilitate the removal of nitrate. This study investigates the kinetics and stoichiometry of glycerol as an external carbon source for denitrification. Biodiesel-based glycerol acclimated mixed liquor was fed glycerol as an external carbon source in lab scale batch experiments to estimate specific denitrification rate (SDNR), maximum specific growth rate, C:N ratio, growth yield and half saturation constants for COD limiting conditions. The average SDNR for acclimated and unacclimated mixed liquor was 1.4 mg NO x -N /gVSS/hr. The maximum specific growth rate was estimated at 3.4 d -1 . Stoichiometric C:N ratio and growth yield were estimated as 4.2 mg COD/mg NO x -N and 0.32 mg biomass COD/mg NO x -N respectively. The half saturation constant was estimated between 5-8 mg COD/L.

Section: Maximum Specific Growth Rate (µ Max )supporting

confidence: 51%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimating The Kinetics And Stoichiometry Of Heterotrophic Denitrifying Bacteria With Glycerol As An External Carbon Source

Hinojosa¹,

Riffat²,

Fink³

et al. 2008

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“…(b) Dold et al, 2007. (c) Copp and Dold, 1998. (d) Tchobanoglous, Burton and Stensel, 2003. (e) Nichols, et al, 2007. (f) Adapted from McCarty, 1969. (g) Cherchi, et al, 2008.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Operating Issues and Dosing Requirements for Alternative Carbon Sources in Denitrification Filters

deBarbadillo¹,

Miller²,

Ledwell³

2008

The need for alternative supplemental carbon sources to support denitrification has been magnified during the past few years because of parallel nutrient reduction initiatives for the Chesapeake Bay and Long Island Sound. As a result, research into the use of alternative carbon sources is ongoing, including investigation into the impacts of different substrates on activated sludge denitrification kinetics as well as establishing the carbon requirements specific to each substrate. Denitrification filters are a popular add-on technology for meeting low nitrogen limits, and test results from several facilities suggest that there are some unique operating considerations associated with the use of different carbon sources. This paper presents denitrification filter data for several alternative carbon sources, and compares and contrasts the performance with methanol and theoretical values.

“…Determination of anoxic yield coefficients for different substrates has been a topic of recent research (Mokhayeri et al, 2006;Nichols et al 2007;Cherchi et al, 2008). For example, incorporating a methanol anoxic yield coefficient of 0.38 into equation 9 results in a requirement of 4.6 mg COD/mg NO 3 -N denitrified.…”

Section: Tertiary Denitrificationmentioning

confidence: 99%

Factors Affecting the Design and Operation of Biologically Active Filters

deBarbadillo¹,

Rogalla²,

Tarallo³

et al. 2010

Over the past thirty years, biologically active filters (BAF) have been demonstrated as reliable and robust processes for wastewater treatment. These systems can be designed for carbon removal, nitrification or denitrification depending on process objectives. There are a number of configuration options with differences in media and the backwashing regime, and there are several manufacturers of each type of process equipment package. This paper is being submitted by the authors of the BAF section that was recently written for the new WEF Manual of Practice No. 8 and will cover process variations, equipment types and patent issues, and process and detailed design information for each type of BAF to assist the designer in making an independent assessment between types of BAF configurations.