Utilization of lime-softening sludge to obtain calcium nitrate

Korchuganova, Olena; Afonina, I. Yu.; Prygorodov, Pavlo; Mokhonko, Victoriya; Канарова, К.І.

doi:10.15587/1729-4061.2018.141007

Cited by 2 publications

(3 citation statements)

References 15 publications

(20 reference statements)

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“…Overall, the materials predicted to precipitate agreed with the study of lime sludge characteristics by Korchuganova et al[48] who indicated the sediment comprised of a mixture of calcium carbonate (…”

supporting

confidence: 87%

Process design of a treatment system to reduce conductivity and ammoniacal nitrogen content of landfill leachate

Scott

Millar

Altaee

2019

Journal of Water Process Engineering

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An innovative combination of computational modelling and laboratory testing was applied to address the challenge of reducing conductivity and ammoniacal nitrogen in landfill leachate.The hypothesis was that accelerated selection of an appropriate treatment process could be achieved by application of new water process engineering software termed AqMB. Several scenarios were investigated incorporating settling ponds, clarifiers, lime softening, ion exchange, pH adjustment and degassing unit operations. Settling ponds reduced the lime demand if a lime softening process was tested, albeit ponds involved greater expense and needed space. Alternately, a clarifier using aluminium chlorohydrate removed suspended solids. Use of a single cation resin bed in series with a strong base anion (SBA) resin column was not able to meet regulatory targets. However, employment of a weak acid cation (WAC) and strong acid cation (SAC) resin combination achieved very low ammoniacal nitrogen levels.To satisfy conductivity limits both a degassing unit and a strong base anion (SBA) resin were also necessary. Bench top testing of actual leachate confirmed that the software predicted the trends in water quality. Final solution conductivity of ca. 250 µS/cm and ammoniacal nitrogen content of <1 mg/l were recorded which were compliant with target values of <1600 µS/cm and <100 mg/l ammoniacal nitrogen. Process economics encompassing power, chemicals, and resin costs were calculated to be A$10.50 per kL leachate.

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confidence: 87%

Process design of a treatment system to reduce conductivity and ammoniacal nitrogen content of landfill leachate

Scott

Millar

Altaee

2019

Journal of Water Process Engineering

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“…A future research avenue should be the exploration of alternative calcium-based media instead of calcium nitrate, such as shellfish shells and eggshells, as has been done for microbial-induced carbonate precipitation, 67 or the potential to recover calcium nitrate from wastes, such as lime-softening sludge. 68 Finally, to maximize the valorization of the process, it will be necessary to recycle the calcium carbonate. Calcium nitrate can be recovered via organic solvents in the production of potassium, although it has not been explored for a DMS system and should be an area of future research.…”

Section: Resultsmentioning

confidence: 99%

“…These concerns would need to be addressed in the scale-up of the process. A future research avenue should be the exploration of alternative calcium-based media instead of calcium nitrate, such as shellfish shells and eggshells, as has been done for microbial-induced carbonate precipitation, or the potential to recover calcium nitrate from wastes, such as lime-softening sludge . Finally, to maximize the valorization of the process, it will be necessary to recycle the calcium carbonate.…”

Section: Resultsmentioning

confidence: 99%

Upgrading of Low-Grade Colombian Coals via Low-Cost and Sustainable Calcium Nitrate Dense Media Separation

et al. 2022

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Wet coal beneficiation in Colombia is prohibitive due to the high cost and scarcity of commonly used dense media. The practical value of this study is that it demonstrates for the first time that a common fertilizer, calcium nitrate, can be used in the beneficiation of low-grade Colombian coals. Three high-ash low-grade Colombian coals (Valle, Cundinamarca, and Antioquia) commonly used in Colombian sugar mill stoker furnaces were tested. Coal mineralogy and prevalence were analyzed before and after washing using mineral liberation analysis. The swelling potential of the coals was assessed using a novel application of thermal mechanical analysis (TMA) and an ash fusion oven (AFO). Calcium nitrate reduced ash levels across all size fractions, even for highash coals like Valle (29% to below 7%) to acceptable levels for coke manufacturing or pulverized fuel combustion. The novel use of TMA and AFO to analyze coal swelling demonstrated that swelling varies under constrained and unconstrained conditions and the small sample size allows for rapid testing of coal swelling. This study has demonstrated that the use of common fertilizers can allow beneficiation to become a processing option for low-grade coals in Official Development Assistance countries where conventional dense media is prohibitively expensive.

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Utilization of lime-softening sludge to obtain calcium nitrate

Cited by 2 publications

References 15 publications

Process design of a treatment system to reduce conductivity and ammoniacal nitrogen content of landfill leachate

Process design of a treatment system to reduce conductivity and ammoniacal nitrogen content of landfill leachate

Upgrading of Low-Grade Colombian Coals via Low-Cost and Sustainable Calcium Nitrate Dense Media Separation

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