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• “Produced water” from oil and gas production • Stormwater capture and reuse ZLD involves various process steps, for example reverse osmosis and evaporation Another involves using power plant heat to achieve the evaporation. Image courtesy of Aquatech

Highperformance

From a global perspective, the global industrial market is more promising, with a growth rate of 7 per cent per annum. This high growth industrial market includes zero liquid discharge (see box text) and wastewater re-use. As mentioned before, the sanitation and re-use of water is an interesting growth market. Wastewater re-use also involves a bigger investment in high performance valves than normal wastewater treatment. It can involve evaporation and reverse osmosis which require special valve designs. One of the biggest present and potential uses is the power industry. In China, re-use of municipal wastewater from power plants is standard practice. In the U.S., municipal wastewater sources are convenient. The average power plant is within 70 miles of a municipal wastewater plant. This use of power plant heat involves a spray drier and a critical valve to control slurry injection into the dryer. To conclude, the market for valves for water and wastewater will be driven by population growth which will increase total use. A bigger driver, however, will be the water scarcity that is in part due to climate change but also do to previous water management practices.

By Bob McIlvaine.

Valve World, www.valveworldexpo.com

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