活性污泥法降解EDTA废水的最佳条件

Optimal Degradation Conditions of Aactivated Sludge Process for EDTA Wastewater

在以EDTA作为单一碳源,以及葡萄糖、磷酸氢二钠、尿素作为营养盐条件下,测试了活性污泥降解EDTA的最佳条件。结果表明,在EDTA为0.001mol/L,污泥沉降比(SV%)为35%的常温常压条件下,pH为6、7、8时,EDTA的降解率分别为64.24%、78.80%、73.24%;在pH=7,20%～50%之间的污泥沉降比对0.001mol/L的EDTA的降解率在58.63%～81.69%之间,以SV%在40%时为最高。在pH为7,SV%为40%时对初始浓度为50～374mg/L的EDTA的降解率在75.64%～85.94%之间,以300mg/L的EDTA为最高。

An experiment of EDTA degradation was performed by using activated sludge with addition of Na2 HPO3 and glucose. The results showed that the degradation efficiency （DE） of EDTA were 64. 24%, 78. 80% and 73.24% when the pH was 6,7 and 8, respectively. When the sludge settling ratio（SV） were from 20% to 50% and the pH was 7, the DE of EDTAean reached to 58.6%--81.69%, the best EDTA DE was that when the SV is 40 percent. The EDTA DE reached to 75.64-85.94% when the initial concentration of EDTA were from 50 to 374 mg/L. In brief, the optimal conditions of the EDTA biodegradation were ： the value of pH 7, SV of 40%, and the initial concentration of EDTA of 300 mg/L.