酸/碱+超声联合厌氧发酵强化污泥释磷及蓝铁矿法磷回收研究  

Enhanced Phosphorus Release from Sludge by Combined Acid/alkali+Ultrasonic Anaerobic Fermentation and Phosphorus Recovery by Vivianite Method

作　　者：马娟[1,2,3] 周怡君 蔡雨麒 周园 张贤庆 赵龙 于占洋 MA Juan;ZHOU Yijun;Cai Yuqi;ZHOU Yuan;ZHANG Xianqing;ZHAO Long;YU Zhanyang(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Wastewater Treatment Industry Technology Center,Lanzhou 730070,China;Key Laboratory of Yellow River Environment in Gansu Province,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]甘肃省污水处理行业技术中心,兰州730070 [3]甘肃省黄河水环境重点实验室,兰州730070

出　　处：《兰州交通大学学报》2025年第1期10-18,共9页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(52060013);兰州市人才创新创业项目(2019-RC-109);兰州交通大学基础研究拔尖人才项目(2022JC50)。

摘　　要：以污水处理厂市政污泥为研究对象,考察了污泥厌氧处理过程中不同铁源,无定形铁(γFeOOH)、赤铁矿(Fe_(2)O_(3))及针铁矿(αFeOOH),被异化金属还原菌(DMRB)还原的难易及酸碱+超声联合预处理对污泥释磷乃至蓝铁矿生成的提升影响。结果表明:不同铁源体系铁还原率分别为γFeOOH(68.28%)、αFeOOH(20.92%)、Fe_(2)O_(3)(5.32%),铁被还原的难易受铁源结晶度的影响最大,结晶度越低,越易被微生物利用。酸/碱+超声预处理均能有效促进磷的释放,且超声条件相同,碱性环境的释磷性能显著优于酸性环境,初始pH=9和11条件下PO_(4)^(3-)释出量相较中性条件分别提高了68%和80%。另外,中性偏碱环境也有利于DMRB的异化铁还原过程,有利于系统内释出的磷和还原态铁结合,从而促进蓝铁矿的生成。相较于单独厌氧发酵体系,预处理联合厌氧发酵系统的PO_(4)^(3-)释放量增加94%,蓝铁矿产量提升至110%。Taking municipal sludge from sewage treatment plants as the research object,the study investigated the ease of reduction of different iron sources,γFeOOH,Fe_(2)O_(3),andαFeOOH,by dissimilatory metal reducing bacteria(DMRB)during anaerobic treatment of sludge,as well as the impact of acid base+ultrasonic combined pretreatment on the release of phosphorus from sludge and the promotion of the formation of blue iron ore.The results showed that the reduction rates of iron in different iron source systems were:γFeOOH(68.28%),αFeOOH(20.92%),and Fe_(2)O_(3)(5.32%).The difficulty of iron reduction may be most affected by the crystallinity of the iron source,with lower crystallinity being more easily utilized by microorganisms.Both acid/alkali and ultrasonic pretreatment can effectively promote the release of phosphorus.Under the same ultrasonic conditions,the phosphorus release performance in alkaline environment is significantly better than that in acidic environment.The release of PO _(4)^(3-) under initial pH=9 and 11 conditions increase by 68%and 80%respectively compared to neutral conditions.In addition,a neutral to alkaline environment is also beneficial to the dissimilatory iron reduction process of DMRB,which facilitates the binding of phosphorus released from the system with reduced iron,thereby promoting the formation of vivianite.Compared to the anaerobic fermentation system alone,the pretreatment combined with anaerobic fermentation system increased the release of PO _(4)^(3-) by 94%and the production of vivianite by 110%.

关 键 词：酸碱处理 超声 磷回收 蓝铁矿 市政污泥 

分 类 号：X703.1[环境科学与工程—环境工程]