黑曲霉、荧光假单胞菌去除污水中重金属试验研究

Removal of Heavy Metals from Urban Sewage by Aspergillus Niger and Pseudomonas Fluorescens

将黑曲霉和荧光假单胞菌引入到传统的卡鲁塞尔氧化沟工艺模型中,参照规范中氧化沟的水力停留时间,分别选取12、16、20、24、28、32和36 h水力停留时间进行试验,研究了不同水力停留时间2种菌种对重金属Cd、Cr、Pb和Cu的吸附降解规律。对水力停留时间为36 h进行了接种对比试验研究。研究发现接种2种菌种后,当水力停留时间为20 h时,黑曲霉对4种重金属的去除率达到52%~91%,荧光假单胞菌对4种重金属的去除率均达到70%以上,去除效果非常显著,而这个时间参数也正是氧化沟常规的设计参数,由此可以说明,将黑曲霉和荧光假单胞菌引入到城市污水处理工艺中,可以明显提高常规工艺对重金属的吸附降解效率。

Aspergillus niger and Pseudomonas fluorescens were inoculated to the activated sludge in order to improve the removal effectiveness of the oxidation ditch.The comparative experimental study were carried out when the Hydraulic Retention Time（HRT） was 36 h,and six different HRT of 12 h,16 h,20 h,24 h,28 h,and 32 h were considered to study the adsorption degradation of Cd,Cr,Pb and Cu by Aspergillus niger and Pseudomonas fluorescens in the oxidation ditch.The result indicated that each of the two strains removal efficiency of the four heavy metals compared with the control group was significantly improved,and the removal increased with the increasing HRT.When the HRT was 20 h,the removal efficiency of the four heavy metals by the Aspergillus niger were found to be in the range of 52% to 91%,and the removal efficiency by Pseudomonas fluorescens reached 70%.Most of the heavy metals can be degraded in the HRT of 20 h,and this time parameter is exactly the conventional design parameters of oxidation ditch.It can be say that the degradation efficiency of adsorption of heavy metals can be significantly improved when inoculated with Aspergillus niger and Pseudomonas fluorescens to the traditional carrousel oxidation ditch process.