Denitrification With Carbon Addition – Kinetic Considerations

Dold, Peter; ́cs, I. Tak; Mokhayeri, Yalda; Nichols, Adam; Hinojosa, Jeneva; Riffat, Rumana; Bailey, Walter; Murthy, Sudhir

doi:10.2175/193864707787976975

Cited by 5 publications

(4 citation statements)

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“…Takacs et al [9] accurately simulated four full-scale wastewater treatment plants (WWTPs) with an expanded BioWin model (Envirosim, Canada) under aerobic conditions. Dold et al [10] used modeling to design optimal batch tests procedures, and to estimate the maximum specific growth rate of heterotrophs under anoxic conditions. Phillips et al [11] used a dynamic model to optimize the mixed liquor recycle rate and studied factors that affected nitrogen removal, including the influent wastewater readily biodegradable COD/N ratio and acetate addition.…”

Section: Resultsmentioning

confidence: 99%

Computer Simulation in Predicting Biochemical Processes and Energy Balance at WWTPs

2018

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Abstract. Nowadays, the use of mathematical models and computer simulation allow analysis of many different technological solutions as well as testing various scenarios in a short time and at low financial budget in order to simulate the scenario under typical conditions for the real system and help to find the best solution in design or operation process. The aim of the study was to evaluate different concepts of biochemical processes and energy balance modelling using a simulation platform GPS-x and a comprehensive model Mantis2. The paper presents the example of calibration and validation processes in the biological reactor as well as scenarios showing an influence of operational parameters on the WWTP energy balance. The results of batch tests and full-scale campaign obtained in the former work were used to predict biochemical and operational parameters in a newly developed plant model. The model was extended with sludge treatment devices, including anaerobic digester. Primary sludge removal efficiency was found as a significant factor determining biogas production and further renewable energy production in cogeneration. Water and wastewater utilities, which run and control WWTP, are interested in optimizing the process in order to save environment, their budget and decrease the pollutant emissions to water and air. In this context, computer simulation can be the easiest and very useful tool to improve the efficiency without interfering in the actual process performance.

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Section: Resultsmentioning

confidence: 99%

Computer Simulation in Predicting Biochemical Processes and Energy Balance at WWTPs

2018

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“…These values were much higher than the 1.53-2.57 for sucrose and 1.29 ± 0.21 for wastewater that were gotten from earlier study using the same methodology [11]. The SDNR values for fermented biosolids were also comparable to the 6.1-10.0 SDNR value for methanol [2,7,10], the most studied and commonly used external carbon in US. This shows some genuine potential of fermented and dark-fermented biosolids as external carbon sources…”

Section: Sdnr Of the Two Fermented Biosolidsmentioning

confidence: 59%

“…This should provide excessive nutrient sources for denitrification process to reach the maximum rate [2].…”

Section: B) Sdnr Experimentsmentioning

confidence: 99%

Assess the Denitrification Potential of Fermented Biosolids Based on Their Specific Denitrification Rate (Sdnr)

Duc¹

2018

JST

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The study examined the potential of fermented and dark-fermented biosolids as external carbon sources for denitrification improvement. This was done by up-scaling the selected two (out of seven) sludge fermentation conditions from past studies, carrying out ammonia stripping pre-treatment to fix the C/N ratio, before finding their specific denitrification rate (SDNR) using SDNR experiment set-up. The gotten SDNR were then compared to the SDNR of other substances gotten from both previous studies and literature, to weight the denitrification potential of fermented biosolids as a substance. The results found that with an initial COD of 607-704 mgCOD/L, the SDNR of the two fermented biosolids and dark fermented biosolids were found to be 8.35 ± 0.41 and 8.56 ± 0.71 respectively. This was much higher than the 1.53 -2.57 for sucrose and 1.29 ± 0.21 for wastewater found in earlier study using the same methodology; and comparable to the denitrification potential value for the well-studied methanol

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“…Adding alternative carbon sources, i.e., acetate or sugar, will not result in an immediate improvement in denitrification (Dold et al 2008). However, the substrate uptake rate (max) and specific denitrification rate (SDNR), measured by feeding ethanol to methanol-utilizers, indicated that ethanol was also used essentially as easily and at a similar rate to methanol by the methanol-utilizers (Dold et al 2008). …”

Section: Removal Of Nitrate (Denitrification) and Perchloratementioning

confidence: 99%