Desupersaturation of RO Concentrates by Addition of Coagulant and Surfactant

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概要

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• One way for the reuse of reverse osmosis (RO) concentrates and thus increasing the water recovery is to recycle part of the brine concentrate to the feed, after precipitating the scaling salts such as CaSO4/CaCO3 held in solution by antiscalants. However, antiscalants impart considerable stability to the supersaturated solution. In the present study, desupersaturation of RO CaSO4 concentrate in the presence of antiscalants was studied by addition of coagulant polyaluminum chloride (PACl) and surfactant sodium dodecyl sulfate (SDS). Simulated experiments for testing the changes in antiscalant concentration were also conducted. The results indicated that under certain conditions, the above methods were effective for desupersaturation of RO concentrate. After the removal precipitation reactions, the calculated supersaturation ratio of the test solution deceased to about 1.0, which demonstrated that the test solution reached thermodynamic equilibrium. With respect to the removal of scaling salt, it was found to follow the second order kinetics. The removal of scaling salt was always accompanied by the adsorption precipitation of antiscalants. The ecomonic analyses show the proposed methods were feasible.

• 社団法人 化学工学会の論文
• 2007-09-01

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

• DAVID Hasson

  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 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

• LISITSIN Dmitry

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

• Lisitsin Dmitry

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

• 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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