摘要
焚烧是当前城市垃圾处置的重要方式,焚烧飞灰及其重金属却是威胁周围环境的一种污染源。为降低这种污染,从植物根际筛选获得高活性脲酶菌,并比较脲酶菌固化焚烧飞灰后的抗压强度、颗粒级配及重金属稳定化效果。结果表明:从丹参根际土壤内分离获得2株高效脲酶菌Bacillus aryabhattai UR-F51和Pseudomonas taiwanensis UR-121;将脲酶菌与飞灰按一定比例混合后固化,菌株UR-F51和UR-121使固化飞灰的抗压强度分别增加48.00%和27.00%,固化颗粒粒径增加10.00%～145.00%;飞灰中重金属(Cr、Ni、Cu、Cd、Hg和Pb)的固化率分别为15.27%～37.23%、41.49%～90.43%、37.17%～99.73%、42.86%～71.42%、20.00%～40.00%和47.06%～82.35%。脲酶菌可显著提升飞灰及其重金属的固化效果,菌株UR-F51的固化效果最好,为缓解城市生活垃圾焚烧飞灰污染提供一种新途径。
Incineration is an important way to dispose the urban refuse, and the fly ash from municipal solid waste incineration （MSWI） and heavy metals are the pollution sources which threaten the surrounding environment. In order to lower the pollution, high activity ureolytic bacteria were gained by plant rhizosphere screening, and compressive strength, grain composition and heavy metal stabilization effect of fly ash solidified with ureolytic bacteria were compared. The results showed that, two strains of highly effective ureolytic bacteria, Bacillus aryabhattai UR FSI and Pseudomonas taiwanensis UR-121 , were isolated from the rhizosphere soil of Salvia miltiorrhiza. After ureolytic bacteria were mixed with fly ash according to certain proportion, fly ash was solidified. The bacterial strains UR FSI and UR- 121 made the compressive strength of solidified fly ash increase by 48% and 27%, respectively; and the particle size of the fly ash solidified withUR FSI andUR -121 increased by10. 00%-145. 00%. The solidification rates of Cr, Ni, Cu, Cd, Hg and Pb in fly ash solidified by UR FSI and UR- 121 were 15.27%-37. 23%, 41.49%-90. 43%, 37. 17%-99. 73%, 42. 86%-71. 42%, 20%-40% and 47. 06%-82. 35%, respectively. Obviously, ureolytic bacteria can improve the solidification effect of fly ash and heavy metals, and especially strain UR FSI has the best solidification effect. This study provides a new way to alleviate the fly ash pollution of from municipal solid waste incineration.
作者
王贵卫
徐辉
丁晓青
陈萍
胡秀芳
WANG Gui-wei;XU Hui;DING Xiaoqing;CHEN Ping;HU Xiufang(College of Life Sciences;School of Civil Engineering and Architecture,Zhejiang Sci Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2018年第6期746-751,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(5157081460
LY16C030002)
关键词
垃圾焚烧
飞灰
重金属
脲酶菌
固化
municipal solid waste incineration
fly ash
heavy metals
ureolytic bacteria
solidification rate
