The Application Of Electrodialysis Technology Used For Furfural Waste Water Treatment

Furfural cannot be synthesized by petrochemical material but produced by scraps of plant fibers, as an important organic chemical material. It is used widely in the callings of foundry, medicament, chemical industry, pesticide, petroleum, synthetic resin, and foodstuff. Because of its simple production technology, less investment and abundance materials , after several decades development our country has already became one of most important furfural produced and exported country of the world. But due to the wastewater of furfural companies could not reached let standard in our country, which increase the conflict between economy development and environment protection. Therefore, to grope for an applied and accord with the situation of our country furfural wastewater treatment method is necessary, it has practical significance to the furfural enterprise development and national economy .In this thesis, we discuss the pivotal problems of electrodialysis techniques which existed in furfural waste water treatment process by electrodialysis and rectify method .The results demonstrated effects of voltage, flow rate, temperature, acetic acid concentration of solution on acetic acid movement, that voltage and flow rate have more impact . By taguchi experiment finds that increase voltage, temperature and flow rate acetic acid movement increased, when voltage,temperature,acetic acid concentration of solution,flow rate are corresponding 20V,40℃,1%,60L/h the acetic acid movement is the highest.The results with different furfural waste water treatment modes indicate that under optimal condition, electrodialysis technology is a useful method to remove acetic acid from furfural waste water, acetic acid concentration decrease from 1.45% to 0.08%, furthermore the volume of diluted solution change a little. Compare two different operated mode(concentrated,diluted solution circulate and concentrated solution unchanged ), the result of concentration keep unchanged mode is better, has higher current efficiency and the volume of diluted solution changed less.