厌氧系统中酵母浸出物提高Co、Fe生物有效性的研究  

Improvement of bioavailability of cobalt and iron by yeast extract in anaerobic system

作　　者：成洁[1] 左剑恶[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《中国环境科学》2010年第2期192-196,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(50678091)

摘　　要：采用半连续实验,研究中、低温条件下酵母浸出物对厌氧系统中Co、Fe溶解性能和生物有效性的改善作用.结果表明,酵母浸出物对提高纯水中和投加不同有机基质的水中溶解态Co、Fe浓度有明显效果,能显著提高低温下厌氧系统中Co、Fe的生物有效性.在15℃和35℃下,投加酵母浸出物后,水中溶解态Co、Fe浓度均有上升,其中Fe浓度升高明显.啤酒废水等含有酵母浸出物的废水对这种提升作用也有帮助.在15℃厌氧系统中移除酵母浸出物、Co、Fe之后,COD去除率由91.6%下降到58%;重新投加Co、Fe后效果有所回升,其中同时添加酵母浸出物的系统,其COD去除率回升明显,升幅达31.6%,产甲烷速率也呈上升趋势,证实了同时投加酵母浸出物和Co、Fe可有效促进低温下厌氧生物系统的处理效能.The improvement of yeast extract on solubility and bioavailability of Co,Fe in mesophilic and psychrophilic anaerobic system were studied.The results indicated that the dosing of yeast extract could significantly increase the solute concentration of Co and Fe in pure water and water with different organic matters,as well as improve their bioavailability in psychrophilic anaerobic system.The dissolved concentration of Co and Fe,especially Fe,increased obviously after yeast extract dosing in water at both 15℃ and 35℃.Wastewater such as brewery wastewater which contains yeast extract contributed to this promotion as well.COD removal efficiency decreased from 91.6% to 58% after removing of yeast extract,Co and Fe in the anaerobic system operated at 15℃.It increased slightly after dosing Co and Fe again,while a remarkable increase（31.6%） appeared when yeast extract was dosed simultaneously,and so does the methane production rate.It is proved that a simultaneous dosing of Co and Fe with yeast extract could improve the performance of psychrophilic anaerobic treatment system.

关 键 词：微量金属元素 生物有效性 酵母浸出物 低温厌氧生物处理 

分 类 号：X703.5[环境科学与工程—环境工程]