摘要
从湖北大冶某铅锌矿选矿废水排水沟污泥中驯化筛选出1株能够有效吸附Zn2＋、Pb2＋并耐低pH值的菌株T1,经分子生物学鉴定,其为芬氏纤维微菌（Cellulosimicrobium funkei）。将T1按单菌种连续挂膜法固定在活性炭上,采用固定化生物活性炭（Immobilized Biological Activated Carbon,IBAC）技术处理pH=4、Pb2＋含量为30 mg/L、Zn2＋含量为100 mg/L的模拟铅锌矿山酸性废水,并与单纯活性炭吸附工艺进行对比,试验结果表明：IBAC工艺对模拟废水中Zn2＋、Pb2＋的7 d平均去除率分别达75.28%和74.16%,处理后废水的pH值提高至6.8~7.5;单纯活性炭吸附工艺虽然在处理模拟废水的开始阶段可取得高达96.80%和95.21%的Pb2＋、Zn2＋去除率,但80 h后Pb2＋、Zn2＋的去除率分别下降到只有9.65%和12.93%,而IBAC工艺的Pb2＋、Zn2＋去除率始终保持在68.27%~76.25%和71.27%~77.89%的较高水平。扫描电镜捡测结果显示：活性炭挂膜后颗粒表面被T1覆盖,变得更为粗糙,孔隙更多;T1呈纤维状,吸附Pb2＋、Zn2＋后体积膨胀,相互间黏结性更强。以上研究成果可为IBAC技术处理铅锌矿山酸性废水的工业化提供参考。
The strain T1 which is domesticated from wastewater drainage sludge in a lead-zinc mine of Hubei Daye, can effectively adsorb Zn2 ＋ and Pb2 ＋ and is resistant to low pH value. Identified by molecular biology, it is called the Cellulosimi- crobium funkei. T1 was immobilized on activated carbon by a single strain of continuous membrane, the immobilized biological activated carbon （IBAC） technique was adopted to treat the acidic Pb-Zn mine waste water with pH value 4, Pb2 ＋ content of 30 mg/L, Zn2＋ content of 100 mg/L, and then contrasted with a simple activated carbon adsorption process. The test results showed that： the removal rate of Zn2＋ and Pb2＋ for 7 d reached to 75.28% and 74.16% respectively by IBAC process, and the pH value of treated wastewater raised to between 6.8 and 7.5. Although the activated carbon adsorption process realized the removal rate of 96.80% and 95.21% of Pb2＋ and Zn2＋ in dealing with the wastewater at the initial stage, but decreased to 9.65% and 12.93 % only after 80h. While the IBAC process can remain removal rate of Pb2 ＋ and Zn2 ＋ between 68.27% and 76.25%, between 71.27% and 77.89% respectively. SEM test results showed that under the activated carbon membrane, the particle is covered by T1, and becomes coarser and more porous. In fibrous, T1 expands in volume after adsorbing Pb2＋ and Zn2＋ , and owns a stronger bond with each other. The findings above can be as a reference for industrial processing of acid Pb-Zn mine drainage by IBAC technology.
出处
《金属矿山》
CAS
北大核心
2014年第6期171-176,共6页
Metal Mine
基金
环保部环保公益性行业科研专项(编号:201209013)
关键词
固定化生物活性炭技术
铅锌矿山酸性废水
铅锌离子
吸附
Immobilized biological activated carbon process
Acid Pb-Zn mine drainage
Lead and zinc ion
Absorption
