12:12 Jun 26, 2016 |
German to English translations [PRO] Tech/Engineering - Other / Rohrleitungen Pigging | |||||||
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| Selected response from: Marga Shaw United Kingdom Local time: 08:02 | ||||||
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3 | gypsum precipitation(s) |
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gypsum precipitation(s) Explanation: Experiments were performed in a piping system to examine the effects of flow rates and Cu 2+ , a common metal ion in wastewater, on the kinetics of gypsum (CaSO 4 .2H 2 O) scale formation. The scaling was monitored by measuring the decrease in Ca 2+ concentrations, [Ca 2+ ], of the scaling solution. AAS analysis shows that [Ca 2+ ] reduces progressively after a certain induction time, during which time the concentration remains steady. Thus, the gypsum precipitation which leads to scaling in pipes does not occur spontaneously. https://www.researchgate.net/publication/253340907_Influence... Overfeed of lime will also tend to increase the pH, which will advance the equilibrium reaction (Equation [6]) and will increase Ca2+ concentrations that will allow gypsum precipitation. http://www.scielo.org.za/pdf/jsaimm/v112n7/10.pdf Fouling of resins involves accumulation of insoluble material on resin beds. Four common types of fouling are: calcium sulphate (gypsum) precipitation, calcium/magnesium hydroxide precipitates, organic matter, and oil films. http://australianbeverages.org/wp-content/uploads/2013/07/Wa... |
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