Development of Denitrification Kinetics for Alternative Supplemental Carbon Sources at Full Scale and Bench Scale

The biodegradation of particulate substrates starts by a hydrolytic stage. Hydrolysis is a slow reaction and usually becomes the rate limiting step of the organic substrates biodegradation. The objective of this work was to evaluate a novel hydrolysis concept based on a modification of the activated sludge model (ASM2d) and to compare it with the original ASM2d model. The hydrolysis concept was developed in order to accurately predict the use of internal carbon sources in enhanced biological nutrient removal (BNR) processes at a full scale facility located in northern Poland. Both hydrolysis concepts were compared based on the accuracy of their predictions for the main processes taking place at a full-scale facility. From the comparison, it was observed that the modified ASM2d model presented similar predictions to those of the original ASM2d model on the behavior of chemical oxygen demand (COD), NH4-N, NO3-N, and PO4-P. However, the modified model proposed in this work yield better predictions of the oxygen uptake rate (OUR) (up to 5.6 and 5.7%) as well as in the phosphate release and uptake rates.

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Evaluation of Quicklime Incorporation in Bench-Scale and Full-Scale Lime Stabilized Biosolids Using a Flat Surface pH Electrode

Journal of the Air & Waste Management Association ◽

10.3155/1047-3289.57.7.794 ◽

2007 ◽

Vol 57 (7) ◽

pp. 794-802 ◽

Cited By ~ 1

Author(s):

Hualiang Teng ◽

Valerian Kwigizile ◽

David James ◽

Valerian Kwigizile ◽

David James ◽

...

Keyword(s):

Flat Surface ◽

Full Scale ◽

Surface Ph ◽

Bench Scale ◽

Ph Electrode

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Reply to comments by Jim Quintiere on ‘full scale bench-scale correlations of wall and ceiling lining’ by Ulf Wickströ and Ulf Göransson

Fire and Materials ◽

10.1002/fam.810170313 ◽

1993 ◽

Vol 17 (3) ◽

pp. 151-151

Author(s):

Ulf WickströM ◽

Ulf Göransson

Keyword(s):

Full Scale ◽

Bench Scale

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Assimilable organic carbon and biodegradable organic carbon removal by nanofiltration: full and bench-scale evaluation

Water Science & Technology Water Supply ◽

10.2166/ws.2001.0064 ◽

2001 ◽

Vol 1 (4) ◽

pp. 35-42 ◽

Cited By ~ 1

Author(s):

I.C. Escobar ◽

A.A. Randall ◽

S.K. Hong

Keyword(s):

Molecular Weight ◽

Ionic Strength ◽

Organic Carbon ◽

Effective Means ◽

High Hardness ◽

Full Scale ◽

Significant Fraction ◽

Size Exclusion ◽

Small Molecular Weight ◽

Bench Scale

The main objective of this research was to evaluate the effectiveness of nanofiltration (NF) at full and bench scale for controlling AOC and BDOC, which are the main indicators of biological stability of the finished potable water. One of the major observations from full-scale operation was that nanofiltration was a very effective means to reduce BDOC, but conversely, did not reject a significant fraction of AOC. The high BDOC rejection by nanofiltration (NF) membranes at full scale can be explained by size exclusion, since a significant fraction of BDOC consists of compounds, such as humic and fulvic acids, which are larger than the pores of NF membranes (molecular-weight cutoff ≈200 daltons). The insignificant AOC rejection observed in full-scale systems was probably due to the low pH, high hardness, and high ionic strength (TDS) of the raw water. Bench scale tests using simulated waters clearly demonstrated that AOC removal by NF membranes decreases markedly with decreasing pH, and increasing hardness and ionic strength, implying that electrostatic repulsion plays a significant role in AOC removal mechanisms. These solution environments repress the electrostatic interaction between charged organic compounds and membranes, allowing passage of small molecular weight compounds and thus reducing AOC rejection.

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Hydrodynamic conditions in bench-scale membrane flow-cells used to mimic conditions present in full-scale spiral-wound elements

Membrane Technology ◽

10.1016/s0958-2118(17)30096-4 ◽

2017 ◽

Vol 2017 (5) ◽

pp. 7-13 ◽

Cited By ~ 2

Author(s):

Sepideh Jankhah

Keyword(s):

Full Scale ◽

Hydrodynamic Conditions ◽

Membrane Flow ◽

Flow Cells ◽

Bench Scale ◽

Spiral Wound

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Enhanced denitrification with external carbon sources in a biological anoxic filter

Water Science & Technology ◽

10.2166/wst.2012.460 ◽

2012 ◽

Vol 66 (10) ◽

pp. 2243-2250 ◽

Cited By ~ 5

Author(s):

Wen-yi Dong ◽

Xian-bing Zhang ◽

Hong-jie Wang ◽

Fei-yun Sun ◽

Tong-zhou Liu

Keyword(s):

Chemical Oxygen Demand ◽

Total Nitrogen ◽

Biomass Yield ◽

Nitrate Nitrogen ◽

Carbon Sources ◽

Oxygen Demand ◽

Brewery Wastewater ◽

Removal Rates ◽

Denitrification Kinetics ◽

Kinetics Of

Three parallel biological anoxic filters (BaFs) were operated to investigate the denitrification kinetics of methanol, brewery wastewater and bakery wastewater. The experiment was conducted within the temperature range of 15–20 °C, with an influent nitrate and carbon dosage of 30 mg/L and 150 mg COD/L (COD: chemical oxygen demand). The denitrification efficiencies of brewery wastewater, bakery wastewater and methanol were 84, 66 and 74%, specific denitrification rates were 1.44, 1.11 and 1.24 kg NO3-N/m3 d, and total nitrogen (TN) removal rates were 74, 62 and 66%, respectively. The volatile attached solid (VAS) tests reveal that methanol has the minimum net biomass yield, so it needs the least carbon to nitrogen (expressed in COD to nitrate, C/N) ratio for complete denitrification. While the brewery wastewater and bakery wastewater need higher C/N ratio to remove all nitrate nitrogen, and they both may need pretreatment to remove phosphate when used as external carbon sources.

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