Removal of CaCO_3 Scaling Salt from RO Concentrates by Air-Blow and Inorganic Inducers

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概要

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• The reuse of reverse osmosis (RO) concentrates generally involves the removal of scaling salts such as CaSO4/CaCO3, and then the recycle part of the treated concentrate to the feed. By this method, the water recovery can be remarkably increased. However, the time necessary for precipitating the scaling components may extend to a few days, especially in the presence of antiscalants. In the present study, CaCO3 scaling salt removal was carried out from RO concentrates in the presence of three antiscalants by accelerating precipitation approaches. Three methods were adopted, including the air-blow method, inorganic inducer addition, and the combinative method of air-blow and inorganic inducer addition. Calcium ion concentration, pH and antiscalant concentration of the test solutions were monitored. Morphologies of the precipitated CaCO3 were observed by scanning electron microscopy (SEM). These methods were found to be effective, reaching a calcium removal ratio as high as 50–80%. The removal of scaling salt was always accompanied by the adsorption precipitation of antiscalants. In the presence of antiscalants, saw-toothed growth edges and holes on the precipitated CaCO3 surfaces were found. Moreover, fragmented small particles were also observed. The economic analysis shows that the methods are feasible.

• 社団法人 化学工学会の論文
• 2008-01-01

著者

• YANG Qingfeng

  School of Environmental Science and Engineering, Shanghai Jiao Tong University

• LIU Yangqiao

  State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute

• SEMIAT Raphael

  GWRI Rabin Desalination Research Laboratory, Department of Chemical Engineering, Technion-Israel Ins

• Semiat Raphael

  Gwri Rabin Desalination Research Laboratory Department Of Chemical Engineering Technion-israel Insti

• David Hasson

  Gwri Rabin Desalination Research Laboratory Department Of Chemical Engineering Technion-israel Insti

• Hasson David

  Gwri Rabin Desalination Research Laboratory Department Of Chemical Engineering Technion-israel Insti

• Liu Yangqiao

  State Key Laboratory Of High Performance Ceramics And Superfine Microstructures Shanghai Institute O

• Yang Qingfeng

  School Of Environmental Science And Engineering Shanghai Jiao Tong University

• Semiat Raphael

  Gwri Rabin Desalination Research Laboratory Department Of Chemical Engineering Technion-israel Insti

関連論文

• Scaling Salt Removal by Addition of Inorganic Particles
• Dropwise Condensation on SAM and Electroless Composite Coating Surfaces
• Removal of CaCO_3 Scaling Salt from RO Concentrates by Air-Blow and Inorganic Inducers
• Desupersaturation of RO Concentrates by Addition of Coagulant and Surfactant
• Direct Processing of RTD Signals from Conductivity Data in Spiral Wound RO Modules

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