Treating An Industrial Wastewater To High-purity Water Quality Using Membrane And IX Technologies
By Joseph M. Wong
A very large integrated steel complex (plant) located in a water-limited area frequently is facing the threat of water rationing by the local water supply company because of limited local water resources. The steel plant uses more than 42 mgd of fresh water for cooling system makeup, boiler system makeup, process washing, cleaning, and other process uses. Encouraged by the recent successful membrane-based municipal and industrial water reuse projects implemented worldwide, the steel plant decided to embark on a water reuse project at the plant. The goal of the project is to recycle 4.2 mgd of purified water from the plantﾒs wastewater streams to compensate for the potential 10% water supply reduction in the future. This article presents a brief description of a feasibility study, pilot testing, demonstration testing, and full-scale implementation of the water reuse project to treat the water to the point it would qualify as a high-purity water.
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