高含盐有机废水蒸发浓缩分离特性实验研究

搭建废水蒸发浓缩分离实验装置,对溶液和废水进行不同温度、p H下的蒸发浓缩分离实验,总结废水热力学与理化特性。结果表明:含盐有机废水溶液沸点随溶液蒸发浓缩比增加而升高,当TDS浓缩至工况相应饱和浓度,沸点升高增加速度骤降;蒸发浓缩分离过程继续推进,盐沉淀析出,沸点升高值趋于平稳;蒸发温度、p H升高,废水在相同蒸发浓缩比时,沸点升高增加;蒸发浓缩分离有机物截留率随蒸发温度、溶液p H的升高而增加。

EXPERIMENTAL RESEARCH ON SEPARATION CHARACTERISTICS IN EVAPORATIVE CONCENTRATION OF ORGANIC WASTEWATER WITH HIGH SALINITY

The paper built a wastewater evaporative concentrating and separation experimental device，and conducted experiments on the solution and wastewater at different temperature and pH conditions． According to the experimental data，a comprehensive summary of the thermodynamic properties and physical and chemical characteristics of wastewater were gained． The results showed that: The boiling point elevation of organic wastewater with high salinity increased with evaporative concentration ratio rised; when TDS reached to saturation concentration，the high amplitude of increasing boiling point elevation dipped; during the evaporation continued to advance，the salt precipitated out and boiling point elevation value went stabilized; as the evaporation temperature and the solution pH increasing，at the same evaporative concentration ratio，boiling point elevation and the organics rejection ratio of evaporative concentration in organic wastewater with high salinity increased．