Accelerating Calcium Carbonate Precipitation in Softening Plants

McCauley, Robert F.; Eliassen, Rolf

doi:10.1002/j.1551-8833.1955.tb19159.x

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…To date, several inorganic materials have been examined for the decontamination of 90 Sr from the RLW by ion exchange [1][2][3][4][5][6][7][8][9][10] and chemical precipitation routes [11,12]. Carbonate precipitation methods have advantages of simplicity and cost effectiveness in terms of operation and applicability to large treatment volumes [11][12][13][14]. The efficiency of the methods is influenced by the separation of precipitates by membrane filtration process.…”

Section: Introductionmentioning

confidence: 99%

Preparation of carbamate-containing vaterite particles for strontium removal in wastewater treatment

Nakamura

Kasuga

Sakka

2017

Journal of Asian Ceramic Societies

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Submicron-sized particles of vaterite, containing carbamate-functionalised siloxane (V-Si), were prepared as the precipitant of radioactive strontium in the treatment of wastewater. The particles consisted of 10-22 nm-sized vaterite crystallites with preferred-orientation towards (00l) plane; a highly charged plane. The crystallites were suggested to be stabilised by the coordination of the siloxane through carbamate (NH-COO −) groups. On being soaked in the aqueous strontium chloride solution, vaterite was dissolved from V-Si to facilitate the competitive precipitation of calcian-strontianite and calcite. The particles containing a large amount of silicon exhibited the highly-controlled dissolution; the formation of calcite was suppressed to increase the strontium contents in the resulting precipitates.

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Section: Introductionmentioning

confidence: 99%

Preparation of carbamate-containing vaterite particles for strontium removal in wastewater treatment

Nakamura

Kasuga

Sakka

2017

Journal of Asian Ceramic Societies

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Methoden zum Herabsetzen oder Verhindern der Krustenbildung

Junghahn¹

1964

Chemie Ingenieur Technik

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Krustenbildung an Oberflächen von Apparaten verschlechtert den Wärmedurchgang und erhöht den Druckverlust. Deshalb muß man das Entstehen dieser Ablagerungen unterdrücken. Methoden zum Herabsetzen oder Verhindern der Krustenbildung werden an Beispielen aus verschiedenen Industriezweigen beschrieben. Jede Art der Verkrustung weist charakteristische Merkmale auf. Man ist daher gezwungen, für das jeweils vorliegende Problem einige der besprochenen Verfahren experimentell zu überprüfen, um das günstigste auszuwählen.

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Effect of Accumulated Lime‐Softening Slurry on Magnesium Reduction

Tuepker¹,

Hartung²

1960

Journal AWWA

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This article discusses an example of reducing magnesium by lime‐softening in the Meramec River water source in the presence of accumulated softening slurry, to an amount that will not precipitate in 140°F domestic hot water heaters and will not require recarbonation. The lime dose for this purpose should not exceed the raw‐water alkalinity equivalent plus 34.24 ppm. The slurry concentration for contacting should be about 5 per cent by weight and should be from softening products only, being virtually free of activated silica, coagulant, and turbidity. If large amounts of magnesium solids are accumulated in the slurry, and are not removed with the effluent water, the slurry becomes less effective as a softening aid. Mixing and contacting time for the softening reactions should be about 30 min.

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Accelerating Calcium Carbonate Precipitation in Softening Plants

Cited by 5 publications

References 3 publications

Preparation of carbamate-containing vaterite particles for strontium removal in wastewater treatment

Preparation of carbamate-containing vaterite particles for strontium removal in wastewater treatment

Methoden zum Herabsetzen oder Verhindern der Krustenbildung

Effect of Accumulated Lime‐Softening Slurry on Magnesium Reduction

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