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Study of magnetite-immobilized bacterial cell system for removal and recovery of heavy metals from electroplating effluent.

机译：固定磁铁矿的细菌细胞系统用于从电镀废水中去除和回收重金属的研究。

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摘要

Cu2+ and Ni2+ are the major heavy metal ions in electroplating wastewater of Hong Kong. The present study was conducted to investigate the removal and recovery of Cu2+ and Ni2+ from electroplating wastewater by bacterial cell biomass.; A gram-negative bacterium Pseudomonas putida with high Cu2+ and Ni2+ accumulating capability was isolated from local electroplating effluent. P. putida 5-x cells cultured in sulfate limiting medium was found of obviously high Cu2+ and Ni2+ adsorption capacity compared with those cultured in other media. Higher incubation temperature had a negative effect on Cu2+ and Ni2+ adsorption of P. putida 5-x cell, with effect particularly obvious at the logarithmic growth phase. The bacterial cells harvested in 34∼38h and 28–30h had maximum Cu2+ and Ni 2+ adsorption capacity, respectively.; The adsorption process of Cu2+ and Ni2+ by fresh cell consisted of two phases, namely a rapid, metabolism-independent metal ions adsorption phase (biosorption) followed by a slow metabolism-dependent bioaccumulation phase, while pretreated cell only consisted of a rapid, metabolism-independent adsorption phase. About 80% of the total Cu2+ and Ni 2+ taken up by the fresh bacterial cells were removed within the rapid adsorption phase. The adsorption capacity of P. putida 5-x cell was obviously affected by changes of pH. The high the pH, the high the Cu2+ and Ni2+ adsorption capacities.; Under suitable conditions, 0.1∼0.3 M HCl could effective recover Cu2+ and Ni2+ from loaded cell biomass with less biomass loss rate. The desorption process was quite rapid, with 95% Cu 2+ and 99% Ni2+ being desorbed in the first 5 minutes. P. putida 5-x cell as biosorbent could be effectively regenerated and reused at least five cycles for removing and recovering Cu2+ or Ni2+.; The adsorption capacity of magnetite immobilized P. putida 5-x cell to Cu2+ and Ni2+ appeared to be much higher than using magnetite alone. The Cu2+ and Ni2+ adsorption by both magnetite alone and magnetite immobilized cells obeyed the Freundlich isotherms of QM-Cu = 2.1 Ce-Cu 0.68, QIm-Cu = 11.9 Ce-Cu0.74 and QM-Ni = 0.78 Ce-Ni0.79, QM-Ni = 9.7, Ce-Ni0.21.; The capsules outside the fresh cell of P. putida 5-x reduced the adsorption capacity to Cu2+ due to the Cu 2+-bridging formed by binding divalent Cu2+ on electronegative groups in the capsule, which might induce a conformation change within the capsule, and thus resulted in some metal-binding sites on the cell outer membrane or PEG layer becoming inaccessible for Cu2+ binding. (Abstract shortened by UMI.)
机译：Cu 2 + 和Ni 2 + 是香港电镀废水中的主要重金属离子。本研究旨在研究细菌细胞生物质对电镀废水中Cu2 +和Ni2 +的去除和回收率。从当地电镀废水中分离出具有高Cu 2 + 和Ni 2 + 蓄积能力的革兰氏阴性细菌恶臭假单胞菌。 <斜体> P。与其他培养基相比，在硫酸盐限制培养基中培养的putida 5-ital细胞具有明显更高的Cu 2 + 和Ni 2 + 吸附能力。较高的培养温度对 P的Cu 2 + 和Ni 2 + 吸附有不利影响。恶性5-x细胞，在对数生长期尤其明显。在34〜38h和28〜30h收获的细菌细胞分别具有最大的Cu 2 + 和Ni 2 + 吸附能力。新鲜细胞对Cu 2 + 和Ni 2 + 的吸附过程包括两个阶段，即快速的，与代谢无关的金属离子吸附阶段（生物吸附），然后是缓慢的新陈代谢依赖性生物积累阶段，而预处理的细胞仅由快速的新陈代谢无关的吸附阶段组成。在快速吸附阶段，新鲜细菌细胞吸收的Cu 2 + 和Ni 2 + 总量约占80％。 <斜体> P的吸附容量。 pH变化明显影响恶臭5-x细胞。 pH值越高，Cu 2 + 和Ni 2 + 的吸附能力越高。在适当的条件下，0.1〜0.3 M HCl可以有效地从负载的细胞生物质中回收Cu 2 + 和Ni 2 + ，生物质损失率较低。解吸过程非常迅速，在开始的5分钟内解吸了95％的Cu 2 + 和99％的Ni 2 + 。可以有效地再生恶臭假单胞菌 5-x细胞，并至少重复使用五个循环以去除和回收Cu 2 + 或Ni 2 + .;固定磁铁矿<斜体> P的吸附能力。恶臭的5-x细胞对Cu 2 + 和Ni 2 + 的作用比单独使用磁铁矿要高得多。单独磁铁矿和固定磁铁矿的细胞对Cu 2 + 和Ni 2 + 的吸附均符合Q M-Cu = 2.1 C的Freundlich等温线。 e-Cu 0.68 ，Q Im-Cu = 11.9 Ce -Cu 0.74 并且Q M-Ni = 0.78 C e-Ni 0.79 ，Q M-Ni = 9.7，C < sub> e-Ni 0.21 。 P新鲜细胞外的胶囊。 Putida 5-x降低了对Cu 2 + 的吸附能力，这是由于二价Cu 2+结合形成的Cu 2 + 桥，可能引起胶囊内的构象变化，从而导致细胞外膜或PEG层上的某些金属结合位点无法与Cu 2 + 结合。 （摘要由UMI缩短。）

著录项

  • 作者

    Wang, Lei.;

  • 作者单位

    Hong Kong Polytechnic (People's Republic of China).;

  • 授予单位 Hong Kong Polytechnic (People's Republic of China).;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 315 p.
  • 总页数 315
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

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