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酸度对好氧颗粒污泥生物吸附含铅废水影响的研究
Effect of acidity on biosorption of Pb2+ wastewater by aerobic granular sludge
投稿时间:2008-07-14  修订日期:2008-09-19
DOI:
中文关键词:  好氧颗粒污泥  Pb2+  离子交换  生物吸附  解析
英文关键词:aerobic granular sludge  Pb2+  ion exchange  biosorption  desorption
基金项目:国家自然科学基金资助项目(30570339);教育部科学技术研究重点资助项目 (106105)
作者单位
王琳 1.中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室青岛 266100 
李煜 1.中国海洋大学环境科学与工程学院海洋环境与生态教育部重点实验室青岛 2661002.西澳大利亚大学水研究中心澳大利亚 6009 
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中文摘要:
      为了有效地控制铅污染,利用序批式反应器(sequencing batch reactor,SBR)培养的以醋酸钠为碳源的好氧颗粒污泥作为吸附剂,进行生物吸附含铅废水的效能和机理的研究。通过考察酸度、接触时间和Pb2+初始浓度等因素的影响,验证好氧颗粒污泥吸附模型,并利用不同的脱附剂,进一步解析其生物吸附的Pb2+。实验结果表明, 酸度是影响好氧颗粒污泥生物吸附Pb2+的关键因素,当初始pH为5时,好氧颗粒污泥对含铅废水生物吸附效果最好。对低浓度(0~20 mg/L)含铅废水, 10 min后可快速达到吸附平衡。好氧颗粒污泥对Pb2+的实测饱和吸附量为101.97±9.00 mg/g,符合朗缪尔(Langmuir)模型。好氧颗粒污泥生物吸附Pb2+的过程,伴随着pH值的升高和K+、 Ca2+、 Mg2+的释放,此现象揭示离子交换作用是好氧颗粒污泥生物吸附Pb2+的机理之一。此外,脱附剂HNO3、EDTA和CaCl2能实现Pb2+的回收和好氧颗粒污泥的重复利用。
英文摘要:
      In order to control the pollution of lead,aerobic granular sludge cultivated in sequencing batch reactor(SBR)was used for the treatment of wastewater containing Pb2+. The influences of acidity, contact time and initial Pb2+ concentration were investigated in batch experiments, and the biosorption model and mechanism were also analyzed. The results of the experiments show that acidity is an important factor in Pb2+ biosorption by aerobic granular sludge. When the initial pH is 5, aerobic granular sludge has the best Pb2+ biosorption efficiency. Moreover,biosorption equilibrium occurs within 10 min at each initial Pb2+ concentration in the range of 0~20 mg/L. The actual biosorption capability of Pb2+ by aerobic granular sludge is 101.97±9.00 mg/g. The Langmuir equation is in good agreement with the experimental data of Pb2+ biosorption by aerobic granular sludge. During the process of Pb2+ biosorption, pH increases and K+,Ca2+,Mg2+ are released, which implies that ion exchange is one of Pb2+ biosorption main mechanisms. Besides, the recovery of Pb2+ with desorbents, HNO3, EDTA and CaCl2, allows the reuse of aerobic granular sludge.
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