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Reactive toughening of polyvinyl alcohol hydrogel and its wastewater treatment performance by immobilization of microorganisms

机译：聚乙烯醇水凝胶的反应增韧及其废水处理性能通过固定微生物化

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摘要

In order to improve the hydraulic impact resistance of a polyvinyl alcohol (PVA) hydrogel as a microorganism immobilization material and meet the requirements of long-time aeration of sewage treatment, toughened PVA hydrogel beads were prepared by co-crosslinking with glycerol through the boric acid (H3BO3) - chemical crosslinking method. It was found that glycerol could increase the consumption of H3BO3 and decelerate the crosslinking reaction of PVA. Crosslinked structures of borate-PVA monodiol complex (abbreviation as BP) and PVA-borate-PVA didiol complex (abbreviation as BP2) were formed, and the proportion of BP2 increased by the introduction of glycerol. Moreover, the pores of the core and surface layers exhibited a similar size and the structure of the PVA/glycerol hydrogel was relatively uniform. With increasing glycerol content, the shear storage modulus (G') and the effective network density (v_e) increased first, then decreased, and reached a maximum in the presence of 1.5 wt% glycerol, indicating the formation of a dense network structure of the gel, resulting in an improvement in the tensile properties and crushing strength of the gel beads. PVA/1.5 wt% glycerol immobilized with and without a microorganism exhibited excellent hydrogel stability during long-term wastewater treatment process. The reactive toughening mechanism of glycerol on the PVA hydrogel was explored. The value of the oxygen uptake rate (OUR) and COD removal rate of the PVA hydrogel immobilized with activated sludge had no obvious difference with addition of glycerol, and a high microbial activity can be maintained.
机译：为了改进聚乙烯醇（PVA）水凝胶作为微生物固定化材料的液压耐冲击性和满足污水处理的长期通气的要求，通过用甘油共交联通过硼酸制备增韧PVA水凝胶珠粒（H3BO3） - 化学交联的方法。据发现，甘油可以增加H 3 BO 3的消耗和减速PVA的交联反应。硼酸-PVA monodiol复合物（缩写为BP）和PVA-硼酸-PVA的交联结构didiol复合物（缩写为BP2）形成，和BP2的比例增加了引入的甘油。此外，孔隙中的芯的层和表面层表现出相似的尺寸和PVA的/甘油水凝胶是相对均匀的结构。随着甘油含量，剪切储能模量（G'）和有效的网络密度（V_E）先增加后降低，并且以重量％甘油1.5存在下达到最大，表明的密集网络结构的形成凝胶，导致在拉伸性能的提高和压碎的凝胶珠的强度。 PVA / 1.5％（重量）甘油的固定化使用和不使用微生物期间长期废水处理过程显示出优异的水凝胶的稳定性。在PVA水凝胶甘油的反应性增韧机理进行了探讨。氧吸收速率（OUR）和固定有活性污泥的PVA水凝的COD去除率的值与添加甘油没有明显的差别，并且可以维持高的微生物活性。

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  • 来源
    《RSC Advances》 |2015年第111期|共9页
  • 作者

    Yi Zhang; Bing Hui; Lin Ye;

  • 作者单位

    College of Biological and Chemical Engineering of Panzhihua University Panzhihua 617000 China;

    College of Biological and Chemical Engineering of Panzhihua University Panzhihua 617000 China;

    State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065 China.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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