Abstract
The aim of this study is to survey damage reduction of in an aqueous environment using nonionic surfactants and to develop a resourceful system that recovers and recycles. In previous papers, it was reported that a nonionic surfactant in solution can be removed and recovered using a suction filtration packing soil system. In this study, the recovered nonionic surfactant was separated from the alcohol component of the extract, and examined for possible recycling. The result showed that NP10, NP15, and NP20 could be separated from alcohol using an evaporator. The structure of the separated nonionic surfactant showed no change, as determined from the result of NMR analysis. The performance parameters related to detergency, namely, surface tension, osmotic force, critical micelle concentration, dispersion force, and emulsion stability, were examined for the nonionic surfactant. Although a part of surface tension, osmotic force, and the dispersion force had the significant difference as compared with the intact surfactants, these were maintained of the nonionic surfactant even after separating it from alcohol. From these results, it is clear that, if restricted for this model system, recovered nonionic surfactants can be recyclable.
