加湿除湿技术用于高盐工业废水脱盐的实验研究

Experimental Study on the Application of Humidification-Dehumidification Technology in the Desalination of High- Salt Industrial Wastewater

摘要:

通过加湿除湿蒸发实验，对高盐工业废水34个不同水样采用了加湿除湿技术进行脱盐处理。在所得实验数据的基础上，对加湿除湿技术在实际工业中的普遍应用进行了可行性研究，并结合不同高盐工业废水的水质特点和处理效果，总结了判定该方法处理高盐工业废水的效果的一般规律。结果表明，实验中所有废水的冷凝液的电导率下降百分比ησ均在80.0%以上，最高可达99.9%；冷凝液的盐度均可达到生化处理标准，其中，有32个废水样的冷凝液的电导率可降到2 000 μS?cm^-1以下。另外，加湿除湿技术对沸点比水高的盐类物质的去除效果较为彻底，对沸点比水低且电离常数较大的盐类物质也有较好的去除效果，而对沸点比水低且电离常数较小的盐类物质的去除效果较差。

Abstract:

Thirty-four different water samples of high-salt industrial wastewater were desalinated by humidification-dehumidification and evaporation experiments. Based on the experimental results， the feasibility study of the universal application of the humidification-dehumidification technology in actual industry is conducted. Combining with the water quality characteristics and treatment effects of different high-salt industrial wastewater， the general rule for judging the effect of this method on the treatment of high-salt industrial wastewater is summarized. The results show that the conductivity drop percentage η_σ of the condensate of all wastewater in the experiment is above 80.0%， with the highest percentage of up to 99.9%. All the salinity of the condensate can reach the biochemical treatment standard， and the electrical conductivity of 32 condensates can be reduced to below 2 000 μS?cm^-1. In addition， via the humidification-dehumidification technology， salt substances with a higher boiling point than water have a complete removal effect， salt substances with a lower boiling point than water and a larger ionization constant have a better removal effect， and salt substances with a lower boiling point than water and a smaller constants have a poor removal effect.