Fouling characteristics and fouling control of reverse osmosis membranes for desalination of dyeing wastewater with high chemical oxygen demand

• Published in: Desalination 2017-10, Vol.419, p.1-7
• Main Authors: Tan, Yu-Jun, Sun, Li-Juan, Li, Bing-Tian, Zhao, Xue-Hao, Yu, Tong, Ikuno, Nozomu, Ishii, Kazuki, Hu, Hong-Ying
• Format: Article
• Language: English
• Subjects: Dyeing wastewater desalination; Membrane fouling; Membrane fouling control; Non-oxidizing biocides; Reverse osmosis (RO)
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2017.04.029

Fouling of reverse osmosis (RO) membranes is a severe problem for desalination of dyeing wastewater with high chemical oxygen demand (COD). In this paper, fouled RO membranes in a pilot-scale desalination system of biologically treated dyeing wastewater containing high COD (143–228mg/L) with or without injection of non-oxidizing biocides were analyzed. The two non-oxidizing biocides used are K5030 (a kind of isothiazoline biocide) and FR110 (an inorganic base type of combined chlorine agent), respectively. For the RO membrane from the system without non-oxidizing biocide injection to the influent, a typical biofilm occurred on the RO membrane in a short operation time of 19days. The injection of non-oxidizing biocides caused a decline of nearly 99.0% in active biomass on the RO membrane. Burkholderiales ruled mature biofilm on the RO membrane without injection of non-oxidizing biocide. Pseudoxanthomonas exhibited a certain resistance to non-oxidizing biocides and ruled the bacterial community on the RO membrane with injection of non-oxidizing biocides. Fe, P and Al were major inorganic elements on RO membranes, decreasing with injection of non-oxidizing biocides. Hydrophobic neutral (HON) fraction was the most major organic component of dissolved organic matter (DOM) on RO membranes, decreasing notably with injection of non-oxidizing biocides. [Display omitted] •Non-oxidizing biocides control RO membrane biofouling, inorganic/organic foulings.•Burkholderiales ruled mature biofilm and was sensitive to non-oxidizing biocides.•Pseudoxanthomonas ruled primary biofilm and was resistant to non-oxidizing biocides.•More organic and inorganic foulings occurred on the inlet part of RO membranes.•Fouling profiles of RO membranes differed from those in RO influent.