Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Post-treatment process for reverse osmosis membranes
Reverse osmosis membranes capable of producing potable water from seawater by single-pass desalination processes are difficult to make. Small defects in the thin film barrier layer are introduced during various stages of production of desalination devices. This report covers research on synthetic and natural organic colloidal preparations that seal membrane defects. Types of colloids synthesized and tested included: polyamine-aldehyde, melamine-aldehyde, and polyphenol-aldehyde condensation products; piperazinepoxy abducts; sulfonated polysulfone; oxidized polyamines, and crosslinked polyacrylic acid. Tannic acid was also tested for comparison. Colloidal preparations with 0.1-0.2 micrometer particle sizes worked best, and were found to seal defects as large as 500 micrometer in thin film composite membranes. Spiralwound membrane elements with as low as 93 percent salt rejection were improved to single-pan desalination quality by treatment with selected colloids. Sequential treatment with a cationic colloid, then an anionic colloid, produced some dramatically increased salt rejections in spiral elementsss initially showing only 68-85 percent salt rejection. (Jensen)
Post-treatment process for reverse osmosis membranes
Reverse osmosis membranes capable of producing potable water from seawater by single-pass desalination processes are difficult to make. Small defects in the thin film barrier layer are introduced during various stages of production of desalination devices. This report covers research on synthetic and natural organic colloidal preparations that seal membrane defects. Types of colloids synthesized and tested included: polyamine-aldehyde, melamine-aldehyde, and polyphenol-aldehyde condensation products; piperazinepoxy abducts; sulfonated polysulfone; oxidized polyamines, and crosslinked polyacrylic acid. Tannic acid was also tested for comparison. Colloidal preparations with 0.1-0.2 micrometer particle sizes worked best, and were found to seal defects as large as 500 micrometer in thin film composite membranes. Spiralwound membrane elements with as low as 93 percent salt rejection were improved to single-pan desalination quality by treatment with selected colloids. Sequential treatment with a cationic colloid, then an anionic colloid, produced some dramatically increased salt rejections in spiral elementsss initially showing only 68-85 percent salt rejection. (Jensen)
Post-treatment process for reverse osmosis membranes
Nachbehandlungsverfahren von Membranen fuer die Umkehrosmose
Cadotte, J.E. (Autor:in) / King, R.S. (Autor:in) / Majerle, R.J. (Autor:in) / Hultman, C. (Autor:in) / Petersen, R.J. (Autor:in)
US Government Reports ; 1-39
1981
39 Seiten
Report
Englisch
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