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首页> 外文会议>The American Institute of Chemical Engineers 2002 Spring National Meeting, Mar 10-14, 2002, New Orleans, LA >Emissions Reduction for Water Purification from Waste Streams by an Evaporative Process
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Emissions Reduction for Water Purification from Waste Streams by an Evaporative Process

机译：通过蒸发工艺减少废水中的水的排放量

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Water reclamation from waste concentration, sea and brackish water desalination, evaporation ponds and CMP slurries can be achieved at less than 35 gmoles of carbon dioxide emissions/ cubic meter of distillate and cost $0.707 1000 gallons. Reverse osmosis and vapor recompression require 80 gmoles carbon dioxide emissions/ cubic meter distillate assuming 35% electric power generation efficiency. The electrical cost for reverse osmosis is about $1.7 per 1000 gallons distillate. For the standard Dewvaporation technique, thermal costs are $1.5 to $3 per 1000 gallon distillate. Utilization of the desiccant heat pumping technique with ambient dry air regeneration reduces energy cost to less than $0.5 per 1000 gallon distillate. The Dewvaporation evaporative process currently funded by the US Bureau of Reclamation and Arizona Salt River Project, belongs to the humidification-dehumidification family. In this process, called Dewvaporation, a carrier-gas is used to evaporate liquids to vapors into a heating carrier-gas and then dew form vapors back to liquids from a cooling carrier-gas on opposite sides of a heat transfer wall. The energy needed for the evaporation is supplied by the energy released from dew formation. External energy is supplied to establish the heat exchange temperature difference. External heat sources can be combustible fuel, solar or waste heat and heat supplied from a desiccant heat pumping means.
机译：废料浓缩，海水和苦咸水淡化，蒸发池和CMP浆液的回收利用，可实现每立方米馏出物二氧化碳排放量少于35克摩尔，成本为0.707 1000加仑。假设发电效率为35％，反渗透和蒸汽再压缩需要排放80克分子的二氧化碳/立方米馏出物。每1000加仑馏出液的反渗透电气成本约为1.7美元。对于标准的脱水技术，每1000加仑馏出物的热成本为1.5到3美元。将干燥剂热泵技术与周围的干燥空气再生一起使用，可将能源成本降低至每1000加仑馏分不到$ 0.5。目前由美国垦殖局和亚利桑那盐河项目资助的脱水蒸发工艺属于加湿除湿系列。在此过程中，称为“蒸发”，使用载气将液体蒸发成蒸气，变成加热的载气，然后从传热壁相对两侧的冷却载气中将蒸气形成露水形式，变成液体。蒸发所需的能量由结露形成的能量提供。提供外部能量以建立热交换温度差。外部热源可以是可燃燃料，太阳能或废热以及由干燥剂热泵装置提供的热。

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