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Osmosis Case Study

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Case Study on zero liquid discharge forward osmosis. Changxing Power Plant Debuts The World's First Forward Osmosis-Based Zero Liquid Discharge Application.

fig. Desalination Technology Transforms 650 m3/day of Abused Industrial Wastewater.

Customer: Changxing Power Plant.
Location: Zhejiang province, China.
Environment: 1.3GW Ultra-Supercritical Coal-fired Power Plant.
Partner: Beijing Woteer Water Technology Co. Ltd.

OVERVIEW
In China, power generation growth has increased national dependence on coal for meeting a large portion of power needs and has in turn driven regulations surrounding environmental controls and water treatment. Regulation of power plant wastewater discharge, to the level of zero liquid discharge for streams …show more content…

Oasys Water has provided its Membrane Brine Concentrator system and pre-concentrating reverse osmosis while Beijing Woteer supplied filtration and ion exchange pretreatment.
The guiding philosophy in designing the zero liquid discharge process flow for Changxing was for the pretreatment and membrane brine concentrator sections of the system to be able to absorb the wide swings in wastewater flow and water quality arising from variations in the flue gas desulfurization scrubber process. Because the wastewater treatment plant was built with the new facility and not a retrofit, the zero liquid discharge process flow was designed based on projected water quality data. Ability to treat a variety of waters across a wide range of hardness, alkalinity and total dissolved solids was therefore planned for in the design of the system.
Several important design decisions were made to optimize the system for stable performance over the expected wide range of water quality and flow conditions, …show more content…

Stoichiometric softening in a contact clarifier was combined with weak acid cation ion exchange polishing.
Membrane brine concentrator process flexibility was maximized so that the wide range of feed flow and water quality could be managed. To accomplish this, the team defined four design cases for flow and incoming total dissolved solids . The reverse osmosis and forward osmosis components of the membrane brine concentrator were then design to produce stable brine total dissolved solids, allowing flow and overall recovery to float as necessary.
To maximize turndown ratio the forward osmosis component of the membrane brine concentrator was split into three trains. This configuration allows operation of the membrane brine concentrator at flows from 60% to 110% of design

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