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化工学报  2015 

Fe(Ⅱ)活化过硫酸盐氧化破解剩余污泥

DOI: 10.11949/j.issn.0438-1157.20141072, PP. 785-792

Keywords: 硫酸根自由基,剩余污泥,强化脱水,氧化破解,响应面优化

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Abstract:

采用Fe(Ⅱ)活化过硫酸盐,产生强氧化性硫酸根自由基(SO4-·),以污泥释放的溶解性COD(SCOD)、相对疏水性(RH)和污泥比阻(SRF)为表征,考察了SO4-·氧化破解剩余污泥强化脱水的影响因素,并解析了机理。结果表明:当初始pH为4.5,n(S2O82-)=2.2mmol·(gVSS)-1,n(Fe2+)=1.32mmol·(gVSS)-1,常温下反应3h后,SCOD由66.5mg·L-1增加到472.3mg·L-1,RH由26.9%升高到41.1%,SRF由24.9×108S2·g-1降低至4.5×108S2·g-1;在此基础上利用响应面法,根据Box-Benhnken中心组合试验设计,以SRF为响应指标,优化条件为pH4.27,n(S2O82-)=2.6mmol·(gVSS)-1,n(Fe2+)=1.59mmol·(gVSS)-1时,SRF为3.8×108S2·g-1,泥饼含水率为72.7%。镜检发现,破解后污泥变为颗粒碎片状;傅里叶红外光谱显示污泥表面官能团对应的特征吸收峰强度有一定程度的减弱;热重分析表明无明显物理吸附水失重区。证实了在SO4-·作用下,污泥菌胶团结构破坏,溶胞释放了有机物,使表观疏水性更强,与水结合力明显减弱,脱水性得到了较大提高,有利于污泥减量化应用。

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