二价铁活化过氧化钙提高剩余活性污泥的脱水性能  

Enhanced Dewaterability of Waste-Activated Sludge in Presence of Fe(Ⅱ)-Activated Calcium Peroxide

作　　者：毕薇薇 阮书瑜 陈吴傲啸 梁方艺 陈智文 谢松儒 唐晶 邓靖[1] BI Wei-wei;RUAN Shu-yu;CHEN Wu-ao-xiao;LIANG Fang-yi;CHEN Zhi-wen;XIE Song-ru;TANG Jing;DENG Jing(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China;MMC Huatian Engineering&Technology Corporation,Nanjing 210019,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310014 [2]中治华天工程技术有限公司,南京210019

出　　处：《环境科学》2020年第12期5544-5551,共8页Environmental Science

基　　金：国家自然科学基金项目(51978618,51808497);浙江省自然科学基金项目(LY18E080036LY20E080021);浙江省大学生创新创业训练计划项目(CXCY2019055);浙江省教育厅科研项目(Y201636517)。

摘　　要：采用Fe^2+活化过氧化钙(Fe^2+/CaO2)提高剩余污泥的脱水性能,考察初始p H值、Fe^2+和CaO2投加量对污泥脱水性能的影响,并进一步探究了实现污泥深度脱水的内在机制.结果表明,初始pH值为中性,Fe^2+和CaO2投加量(以VSS计)分别为3.31 mmol·g^-1和3.68 mmol·g^-1时,污泥的脱水效果最好,污泥比阻(SRF)和含水率(WC)分别由20.99×10^12m·kg^-1和86.61%降低至3.91×10^12m·kg^-1和76.15%.Fe^2+/CaO2的氧化使污泥微生物细胞裂解,胞内有机物释放,胞外聚合物(EPS)降解;同时,Fe^3+促使污泥颗粒再絮凝形成致密、多孔的絮体结构,有利于EPS结合水释放,实现污泥深度脱水.从技术和经济角度来看,Fe^2+/CaO2工艺经济实用,在提高剩余污泥脱水能力方面具有一定的应用前景.Ferrous iron-activated calcium peroxide( Fe^2+/CaO2) was innovatively put forward to improve the dewaterability of wasteactivated sludge. The effects of initial p H,Fe^2+,and CaO2 dosages on sludge dewatering performance were investigated and its internal mechanism for achieving deep sludge dewatering was thoroughly explored. The results indicated that the best dewatering performance was obtained by dosing 3. 31 mmol·g^-1 Fe^2+and 3. 68 mmol·g^-1 CaO2 under neutral p H,in which specific resistance to filtration( SRF) and water content( WC) reduced from 20. 99 × 10^12 m·kg^-1 and 86. 61% to 3. 91 × 10^12 m·kg^-1 and 76. 15%,respectively.Fe^2+/CaO2 oxidation caused sludge microbial cell lysis,release of intracellular organic matter,and degradation of extracellular polymeric substances( EPS). Meanwhile,the generated Fe^3+facilitated re-flocculation of sludge particles into rigid and porous structure flocs,which was beneficial to the release of EPS-bound water to achieve deep sludge dewatering. From the perspective of technology and economy,the Fe^2+/CaO2 process is economical and practical,and has a promising application prospect in improving the dewatering performance of waste-activated sludge.

关 键 词：二价铁 过氧化钙 胞外聚合物 污泥脱水 高级氧化工艺 

分 类 号：X703[环境科学与工程—环境工程]