好氧颗粒污泥SBR处理垃圾渗滤液的污泥理化特性分析

Physicochemical Characteristics of Aerobic Granular Sludge in Granular Sequencing Batch Reactor Treating Landfill Leachate

应用接种颗粒污泥的SBR(GSBR)处理垃圾渗滤液,研究反应器内污泥的理化特性.连续稳定运行91,d的试验结果表明:GSBR中颗粒污泥结构密实;细菌以杆菌为主,颗粒表面发现少量钟虫;粒径以0.20～0.60,mm的小粒径颗粒为主;污泥SVI5min为38,mL/g左右,污泥层区域平均沉降速度(ZSV)为24,m/h;污泥密度为28,g(VSS)/L;颗粒污泥强度(以完整性系数计)为96.3%;含水率为97%;SOUR平均为67.9,mg(O2)/(g(VSS).h);污泥表面相对疏水性为85.9%.污泥内元素分析表明:颗粒状污泥更倾向于选择性结合Ca、Fe、Cu等2价或3价金属,特别是Ca元素以CaCO3化合物的形式在好氧颗粒污泥内核大量沉积.污泥EPS中Na、K和Mg为主要的阳离子,而Ca元素所占的比例相对较小.

By seeding aerobic granular sludge, a SBR, which was correspondingly called GSBR, was applied to treat refractory landfill leachate. The physicochemical characteristics of aerobic granular sludge were studied. During the 91-day continuous operation time, the aerobic granular sludge was stable with dense structure, and was mainly composed of bacillus, as well as some protozoa and metazoan, like vorticella. Granules with the size of 0.20--- 0.60 mm were the main part of the sludge. Its SVIsmin, average zone settling velocity（ZSV）, biomass density, strength（in terms of integrity coefficient） , water content, average SOUR and relative hydrophobicity were 38 mL/g, 24 m/h, 28 g （VSS）/L, 96.3%, 97%, 67.9 mg （02） / （g （VSS） ~ h） and 85.9%, respectively. The elemen- tal analysis showed that multi-valence Ca, Fe, and Cu were the main metal elements of granules. Especially Ca, in the form of CaCO3, largely accumulated in the core of granules. While Na, K, and Mg were the main cations in the extracellular polymer substance （EPS） of granules, in comparison with the low content of Ca.