超声波耦合Fenton氧化对污泥破解效果的研究 ——以粒径和溶解性物质为例

提出超声波和Fenton氧化协同作用来破解污泥,比较了单独的Fenton氧化和超声波耦合Fenton氧化对污泥粒径,溶解性物质和污泥上清液中多聚糖与蛋白质的影响.结果表明,污泥经过Fenton氧化和超声波耦合Fenton氧化处理后,污泥比表面积明显增加,体平均粒径和索太尔平均径都明显降低,污泥的絮凝体结构遭到了氧化破解,污泥的脱水性能和稳定性能得到了改善.超声波耦合对于污泥破解促进作用十分明显,表现在污泥的比表面积变得更大,粒径降低幅度更明显.这2种氧化对于污泥中SCOD的增加促进作用都十分明显,Fenton氧化处理后污泥SCOD从120.45mg/L增加到585.47mg/L,增加3.9倍,而超声波耦合Fenton氧化处理后,污泥中SCOD则能从120.45mg/L增加到767.47mg/L,增加5.4倍.单独的Fenton氧化处理,污泥上清液中多聚糖最高浓度为209.74mg/L,相对于原污泥的57.81 mg/L增加了2.6倍,而超声耦合Fenton氧化处理后污泥上清液中多聚糖最高浓度则为433.68mg/L,相对于原污泥增加了6.5倍.2种氧化对上清液中的蛋白质的作用则是先增加后下降.

Effects of Fenton oxidation with ultrasonic coupling on sludge particle size and soluble substances

The study was conducted to evaluate the effect of ultrasonic on the performance of Fenton oxidation in sludge treatment in terms of sludge particle size, soluble substances and polysaccharide and protein in the supernatant. Both Fenton oxidation and ultrasonic coupled Fenton oxidation significantly increased the specific surface area of sludge, decreased the average particle size and sauter average diameter. Sludge flocculated structure was dramatically destroyed and the dewatering process was enhanced by both treatments. Fenton oxidation increased the concentration of SCOD in sludge by 3.9 times from 120.45mg/L to 585.47mg/L, while ultrasonic coupled Fenton oxidation resulted in an increase by 5.4 times from 120.45mg/L to 767.47mg/L. Ultrasonic coupled Fenton oxidation doubled the concentration of polysaccharide in the supernatant from 209.74mg/L to 433.68mg/L, which are 2.6 and 6.5 times more than the concentration of polysaccharide in the crude sludge respectively. For both oxidation treatments, the concentration of protein in the supernatant was decreased after a short increase.