含磷及含氮农药稀溶液萃取分离的研究

农药生产废水对环境产生了极大的危害。该文在分析农药亲油性的基础上，对含磷及含氮农药稀溶液的萃取平衡特性作了较为系统的研究。研究表明，溶质的亲油性可以作为选择萃取溶剂的依据。溶质的亲油性和溶剂的极性、萃水率是影响物理萃取分配系数的重要因素，络合剂的种类、浓度以及稀释剂的种类、溶质的亲油性都会影响络合萃取的分配系数。在研究农药萃取分离特性的基础上，采用农药稀溶液进行了错流萃取研究，溶剂萃取前后溶液生物降解性的比较表明，萃取置换－生物处理法治理难降解有机废水具有很大的潜力

Study on extraction of farmdrugs containing phosphorus or nitrogen from dilute solution

Wastewater drained from farmdrugs production have done great harm to environment. Considering the hydrophobicity of farmdrugs containing phosphorus or nitrogen, a series of extraction equilibrium for them were studied. The results show that the hydrophobicity of solutes can be a standard for selecting suitable solvents. The hydrophobicity of solutes, as well as the polarity of solvents and the water solubility in the solvents, can affect the distribution coefficients of physical extraction. The kinds of complex agents and dilute solvents, the concentration of complex agents and the hydrophobicity of solutes have influence on the distribution coefficients of extraction based on chemical complexation. In this paper, the cross current flow extraction experiments are done for aqueous solution of farmdrugs. The results illustrate that the combination of displacement by extraction and biological treatment has great potentiality for treating wastewater containing non biodegradable organic contaminant.