CAJ | 학술논문

采用 Fe(Ⅱ)活化过硫酸盐，产生强氧化性硫酸根自由基(SO?4·)，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SO?4·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?)=2.2 mmol·(g VSS)?1，n(Fe2+)=1.32 mmol·(g VSS)?1，常温下反应3 h后，SCOD由66.5 mg·L?1增加到472.3 mg·L?1，RH由26.9%升高到41.1%，SRF由24.9×108 S2·g?1降低至4.5×108 S2·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pH 4.27， n(S2O82?)=2.6 mmol·(g VSS)?1，n(Fe2+)=1.59 mmol·(g VSS)?1时，SRF为3.8×108 S2·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 SO?4·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。
채용 Fe(Ⅱ)활화과류산염，산생강양화성류산근자유기(SO?4·)，이오니석방적용해성COD(SCOD)、상대소수성(RH)화오니비조(SRF)위표정，고찰료SO?4·양화파해잉여오니강화탈수적영향인소，병해석료궤리。결과표명：당초시pH위4.5，n(S2O82?)=2.2 mmol·(g VSS)?1，n(Fe2+)=1.32 mmol·(g VSS)?1，상온하반응3 h후，SCOD유66.5 mg·L?1증가도472.3 mg·L?1，RH유26.9%승고도41.1%，SRF유24.9×108 S2·g?1강저지4.5×108 S2·g?1；재차기출상이용향응면법，근거Box-Benhnken중심조합시험설계，이SRF위향응지표，우화조건위pH 4.27， n(S2O82?)=2.6 mmol·(g VSS)?1，n(Fe2+)=1.59 mmol·(g VSS)?1시，SRF위3.8×108 S2·g?1，니병함수솔위72.7%。경검발현，파해후오니변위과립쇄편상；부리협홍외광보현시오니표면관능단대응적특정흡수봉강도유일정정도적감약；열중분석표명무명현물리흡부수실중구。증실료재 SO?4·작용하，오니균효단결구파배，용포석방료유궤물，사표관소수성경강，여수결합력명현감약，탈수성득도료교대제고，유리우오니감양화응용。
Released soluble COD (SCOD), relative hydrophobicity (RH), and specific resistance of sludge (SRF) were used to characterize sludge disintegration degree, surface hydrophobicity and dewatering performance. The enhanced dewatering influence factors and mechanism of oxidation disintegration of excess sludge were investigated by oxidative sulfate radical (SO?4·) generated from persulfate activated by Fe(Ⅱ). SCOD increased from 66.5 mg·L?1 to 472.3 mg·L?1, RH increased from 26.9%to 41.1%, SRF decreased from 24.9×108 S2·g?1 to 4.5×108 S2·g?1 after disintegration reaction when pH was 4.5, n(S2O82?) was 2.2 mmol·(g VSS)?1, n(Fe2+)=1.32 mmol · (g VSS)?1 and reaction time was 3 h at room temperature. According to the center combination experimental design of Box-Benhnken based on the response surface method, the optimal results were pH=4.27, n(S2O82?)=2.6 mmol·(g VSS)?1, n(Fe2+)=1.59 mmol·(g VSS)?1, SRF=3.8×108 S2·g?1 and sludge cake moisture content rate = 72.7% when SRF was taken as response. Microscopic observation revealed that floc sludge was disintegrated into smaller particles and debris. FT-IR showed the surface functional group corresponding to the absorption peak intensity of sludge decreased to some extent, and thermogravimetric analysis indicated that physical adsorption combined water loss region disappeared. The above results suggested that under the influence of SO?4·, stable sludge zoogloea structure was destroyed, cell lysis and organic matter was released into the liquid phase, sludge surface was more hydrophobic, water binding capacity decreased and sludge dewatering performance was improved considerably, thus facilitating sludge reduction application.