The use of heat treatment to improve solute rejection and fouling resistance of a polyamide reverse osmosis (RO) membrane was investigated in this study. Heat treatment was carried out by immersing the membrane samples in Milli-Q water at 70 °C for a specific duration. Heat treatment (24 h) reduced the pure water permeability from 4.1 to 2.8 L/m2hbar but improved conductivity rejection from 95.5 to 97.0%. As a result, a correlation was observed between changes in the two parameters. Marginal changes in the membrane surface characteristics (i.e. zeta potential, hydrophobicity, chemistry and roughness) were observed as a result of heat treatment. Heat treatment significantly improved the fouling resistance property of the RO membrane. When the secondary effluent was filtrated at an elevated permeated flux, the virgin RO membrane exhibited 30% flux decline while the heat-treated membrane showed only 12% flux decline. This is possibly because heat treatment resulted in a denser cross-linked active skin layer, thus reducing the blockage caused by small organic foulants.
Download our article here http://www.kurita.eu/en/published-articles and learn more about best practices and opportunities to reduce the risk of salt deposition and damage. This article was published in the “PTQ”, a quarterly magazine for refineries and the petrochemical.
Anti-fouling copper hydroxide nanowires (CHNs)-graphene oxide (GO) nanocomposites membrane was fabricated by a vacuum-assisted filtration self-assembly process. CHNs were covered on the surface and inserted into the interlayers of the GO nanosheets to form the rough surface and nanostructure channels. The membrane with water contact angles (CAs) of 53° and oil CAs of 155° exhibited superior stability, hydrophilicity, underwater superoleophobicity and ultralow oil adhesion, and hence it could separate the oil-water...
Masakazu Koizumi and Keisuke Karaki from Kurita Water Industries Ltd. published a technical article in the magazine Hydrocarbon Engineering about ACF – the patented technology for removal and prevention of ammonium chloride salt fouling and corrosion.
Hydrocarbon Engineering is a monthly global magazine for the refinery and petrochemical industry with a net print circulation average of >10,000 pcs per month.
Overview
The Kalamazoo Lake, Sewer and Water Authority (KLSWA) In Michigan, USA, had all they could handle and more with their aging, failing aspirators, persistent fouling and ragging, and what seemed like an endless cycle of maintenance and repairs.
Challenge
KLSWA was consistently experiencing failing floats, ruined motors, debris-clogged propellers, and high maintenance and repair costs. They knew their existing plant needed significant rehabilitation, which included improving the reliability and effectivene...
Watco Group developed an innovative solution that will improve chiller performance, maximise chiller efficiency as well as reduce fouling related costs by eliminating fouling and scaling and translating it into significant energy savings.
One of the biggest energy consumer in most facilities are chillers which can usually consume more than 50% of the electricity. An efficient water management program is of utmost importance to control energy consumption, since the energy required for the chiller to operate...
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