Use of limestone for pH control in autotrophic denitrification: continuous flow experiments in pilot-scale packed bed reactors

Koenig, A; Liu, L.H.

doi:10.1016/s0168-1656(02)00183-9

Cited by 65 publications

(21 citation statements)

References 9 publications

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“…The pH during the experiment decreased from 6.8 to 6. A decrease in pH during carbohydrate fermentation has been also observed in other studies where powdered (Taylor & Nasr-El-Din, 2003) or coarse (Koenig & Liu, 2002;Maree et al, 2004;Maree & Duplessis, 1994) CaCO 3 was used as the neutralizing agent. After the substrate (glucose) was consumed (18 h), the remaining CO 2 was sparged out of the broth resulting in a rapid increase of the pH.…”

Section: Numerical Integrationsupporting

confidence: 72%

Mineral CO2 sequestration by environmental biotechnological processes

Salek

Kleerebezem

Jonkers

et al. 2013

Trends in Biotechnology

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Section: Numerical Integrationsupporting

confidence: 72%

Mineral CO2 sequestration by environmental biotechnological processes

Salek

Kleerebezem

Jonkers

et al. 2013

Trends in Biotechnology

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“…The specific rate of autotrophic denitrification was inhibited when pH decreased below 6.8 [55]. Zinc and copper ions inhibited the reaction, and yet the presence of trichloroethylene did not inhibit the reaction at the concentrations up to 20 mg/L [61].…”

Section: Inhibition and Mitigationmentioning

confidence: 93%

“…According to reaction stoichiometry as shown in Equation (3) [48], the sulphur-utilizing autotrophic denitrification process consumed about 4 g alkalinity (as CaCO 3 ) per g NO 3 -N reduced resulting in a decrease of pH [55], and to compensate that, limestone can be added to the system to increase pH. Based on established chemical-biological interactive relationships, an empirical formula was presented to determine the optimum sulphur to limestone ratio for nitrate removal, taking into account the characteristics of the influent wastewater [55]. The ratio of influent alkalinity to theoretically required alkalinity in the wastewater suggested a value of no less than 0.5 in order to prevent pH inhibition in nitrate removal performance [55].…”

Section: Effect Of Alkalinity and Supplementationmentioning

confidence: 99%

“…Based on established chemical-biological interactive relationships, an empirical formula was presented to determine the optimum sulphur to limestone ratio for nitrate removal, taking into account the characteristics of the influent wastewater [55]. The ratio of influent alkalinity to theoretically required alkalinity in the wastewater suggested a value of no less than 0.5 in order to prevent pH inhibition in nitrate removal performance [55]. The optimum sulphur/limestone ratio was determined to be 1:1 (wt/wt) in autotrophic denitrification systems with sulphur and limestone packing [56].…”

Section: Effect Of Alkalinity and Supplementationmentioning

confidence: 99%

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A review of nitrate reduction using inorganic materials

Zhu

Getting

2012

Environmental Technology Reviews

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In a biological denitrification system for water and wastewater treatment, an external carbon source (electron donor) is usually needed to generate dedicated microbial communities if intrinsic organic substances are insufficient. Alternative sources of electron donors, especially inorganic donors, are becoming more and more attractive in order to replace or reduce carbon use. In this article, inorganic electron donors, i.e. zero-valent iron, ferrous ion, sulphur and hydrogen are reviewed. While carbon dioxide (greenhouse gas) is produced when organic electron donors are used, inorganic electron donors have the potential advantages to reduce a plant's carbon footprint, and prevent carbon eluting out of the system, as occurs with heterotrophic processes. While sulphur and hydrogen are promising for nitrate removal in terms of reaction kinetics and economical feasibility, zero-valent iron and ferrous ion show potential to be utilized as a supplement to heterotrophic denitrification, where it is anticipated that synergistic effects would occur with autotrophic and heterotrophic denitrification, and thus external carbon consumption can be reduced.

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“…The optimum pH for the growth of T. denitrificans is in the range of 6.8-8.2 [6]. In order to control pH, limestone is widely used as an alkalinity source in the SOD process with elemental sulfur as an electron donor [2,[7][8][9][10]. The combination of sulfur and calcium carbonate in the form of pellets as a single matrix also represented an alternative media for ensuring adequate alkalinity for the growth of sulfur oxidizing denitrifiers and for the reduction of clogging problem as well [11].…”

Section: Introductionmentioning

confidence: 99%

Bioaugmented sulfur-oxidizing denitrification system with Alcaligenes defragrans B21 for high nitrate containing wastewater treatment

Flores

Nisola

Cho

et al. 2007

Bioprocess Biosyst Eng

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The performance of enriched sludge augmented with the B21 strain of Alcaligenes defragrans was compared with that of enriched sludge, as well as with pure Alcaligenes defragrans B21, in the context of a sulfur-oxidizing denitrification (SOD) process. In synthetic wastewater treatment containing 100-1,000 mg NO3-N/L, the single strain-seeded system exhibited superior performance, featuring higher efficiency and a shorter startup period, provided nitrate loading rate was less than 0.2 kg NO3-N/m(3) per day. At nitrate loading rate of more than 0.5 kg NO3-N/m(3) per day, the bioaugmented sludge system showed higher resistance to shock loading than two other systems. However, no advantage of the bioaugmented system over the enriched sludge system without B21 strain was observed in overall efficiency of denitrification. Both the bioaugmented sludge and enriched sludge systems obtained stable denitrification performance of more than 80% at nitrate loading rate of up to 2 kg NO3-N/m(3) per day.

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Use of limestone for pH control in autotrophic denitrification: continuous flow experiments in pilot-scale packed bed reactors

Cited by 65 publications

References 9 publications

Mineral CO2 sequestration by environmental biotechnological processes

Mineral CO2 sequestration by environmental biotechnological processes

A review of nitrate reduction using inorganic materials

Bioaugmented sulfur-oxidizing denitrification system with Alcaligenes defragrans B21 for high nitrate containing wastewater treatment

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