Identifying Membrane Foulants in Chemical Cleaning Solutions

Abstract:

The main objective of this study was to investigate foulants in chemical cleaning solutions of membrane (CCSM). Sodium hydroxide (NaOH), sodium hypochlorite (NaOCl), hydrochloric acid (HCl) were used as chemical agents respectively. Hydrophobicity, molecular weight distribution and metal ions of foulants in CCSM were analyzed as the major characters for membrane fouling. Results reveal that alkali cleaning can remove both hydrophobic and hydrophilic fractions of natural organic matters (NOM), and acid cleaning mainly removes hydrophilic organic matters. Medium molecular weight of very hydrophobic acids (1-10 kDa) and different molecular weight of neutral hydrophilic acids (100-1000 Da & >300kDa) in NOM can lead to membrane irreversible fouling. Acid cleaning is relatively effective for the reduction of inorganic foulants. The main metal ions in acid cleaning solutions are K ,Ca, Al and Mn, which are responsible for membrane inorganic fouling.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 1872-1878
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.1872
• Online since: August 2013
• Authors: Jun Xia Liu*, Bing Zhi Dong, Yun Ge Sheng, Ji Ping Wang
• Keywords: Chemical Cleaning, Hydrophobicity, Membrane Fouling, Metal Ions, Molecular Weight Distribution

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