摘要
通过在好氧污泥颗粒化初期(10~16d)投加硫酸铝的方式来加速好氧污泥的颗粒化进程.采用X荧光光谱仪测定元素含量,扫描电镜和能量弥散X射线光谱仪联用的方法测定元素的空间分布.结果显示:Al^(3+)快速造粒形成的颗粒污泥结构更加密实,生物量大,具有更加良好的污泥特性.加药停止后,颗粒中Al元素含量从16d的(45.69±0.55)%逐渐下降至43d的(1.09±0.39)%,总体呈一个近似线性下降的趋势.与此同时,颗粒中P和S元素的含量分别由(7.21±0.047)%和(32.11±0.23)%逐渐回升至(13.64±0.071)%和(47.82±0.21)%,并且在成熟后的颗粒中Al元素主要以沉淀物的形式分布在污泥颗粒的核心.这说明加药期间微生物之间的聚集方式以物化絮凝为主,停止加药后微生物的自絮凝逐渐替代了混凝剂的无机絮凝,成为微生物聚集的主要手段.结果证明Al^(3+)快速造粒过程是一个物化-生化的耦合过程.
During the initial stage of aerobic granulation(10~16d),the aluminum sulfate feeding strategy was applied toaccelerate the granulation of aerobic granules.The elements content were analyzed by X-ray fluorescence spectrometer(XRF).Scanning electron microscope combined with energy dispersive X-ray detector(SEM-EDX)were used toanalyzed the spatial distribution of elements.The results showed that the granules cultivated with aluminum sulfate hadmore compact structure,more biomass and better characteristics.After chemical dosing,the content of aluminum ingranules linearly decreased from(45.69±0.55)%(16d)to(1.09±0.39)%(43d).Meanwhile,the content of P and Srecovered from(7.21±0.047)%and(32.11±0.23)%to(13.64±0.071)%and(47.82±0.21)%,respectively.Aluminummainly accumulated in the core of the mature granules and was in the form of precipitate.During the chemical dosing,theaggregation of microorganism was mainly caused by the physical flocculation.Since the chemical dosing terminated,theself-flocculating of microorganism gradually replaced the inorganic flocculation of flocculant and became the main modefor microbial aggregation.The results prove that Al3+accelerated granulation is a coupling process betweenphysicochemical-biochemical effects.
作者
李昱欢
刘永军
李洋媚
刘喆
LIU Yong-jun;LI Yu-huan;LI Yang-mei;LIU Zhe(School of Environmental and Municipal Engineering, Xi-an University of Architecture and Technology, Xi-an 710055, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第6期2122-2129,共8页
China Environmental Science
基金
国家自然科学基金资助项目(51178377)
关键词
好氧污泥
快速造粒
AL元素
空间分布
aerobic sludge
fast granulation of aerobic granules
Al
spatial distribu
