Qatar Petroleum (QP) could save about $1.75mn yearly with its Mesaieed refinery gearing up to adopt zero liquid discharge (ZLD) as part of doubling the capacity of waste water treatment. The plan also includes a new train of biological treatment plant.
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The ZLD system will recover 99% of the reusable water, which will be used as make-up water for the cooling towers, demineralisation unit of boiler feed and for irrigation, Nadeem Shakir, senior project engineer, QP Refinery, said in a technical paper presented to the 2nd Joint Qatar-Japan Environment/ 21st Joint GCC-Japan Environment symposium, which concluded yesterday.
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“The yearly savings to QP Refinery, from recycling, is expected to be about $1.75mn in terms of water costs,” he said.
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The implementation of the project will start soon and a pilot plant will be installed in the refinery before the full scale implementation of the scheme, he added.
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Based on the extensive studies conducted over a two-year period, the best available technology has been evaluated for ZLD, which involves multi-stage reverse osmosis for brackish water recovery and mechanical vapour recompression with crystalliser for brine and flue gas scrubber recovery and salt removal.
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