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首页> 外文期刊>Journal of Polymers and the Environment >Toughening of Polyvinyl Alcohol Hydrogel Through Co-Crosslinking and its Wastewater Treatment Performance by Immobilizing with Microorganism
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Toughening of Polyvinyl Alcohol Hydrogel Through Co-Crosslinking and its Wastewater Treatment Performance by Immobilizing with Microorganism

机译：共交联法增韧聚乙烯醇水凝胶及其微生物固定化处理废水的性能

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摘要

In order to improve the hydraulic impact resistance of the polyvinyl alcohol (PVA) hydrogel as microorganism immobilization carrier and meet the requirements of long-time aeration of sewage treatment, the toughening PVA hydrogel beads were prepared by co-crosslinking with polyoxypropylene triol (PPG) through the boric acid (H3BO3)-chemical crosslinking method. It was found that PPG could increase the consumption of H3BO3, participated and accelerated the crosslinking reaction of PVA, and the pore size of the surface layer and core layer of the hydrogel beads can be controlled. With increasing PPG content, the shear storage modulus (G') and the effective network density (nu(e)) increased first, reached maximum in presence of 2 wt% PPG, and decreased afterwards. A relatively low content of PPG could promote the formation of relatively uniform and dense network structure in PVA hydrogel, resulting in an improvement of the mechanical property and long-term hydraulic stability of the gel beads. By addition of PPG, the capillary water absorption capacity of PVA hydrogel can be enhanced and the high permeability can be kept well. When applying in waste water treatment, 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 PPG, and a high microbial activity can be maintained.
机译：为了提高聚乙烯醇（PVA）水凝胶作为微生物固定载体的耐水压冲击性能，并满足污水长时间曝气的要求，通过与聚氧丙烯三醇（PPG）共交联制备了增韧的PVA水凝胶珠。通过硼酸（H3BO3）-化学交联的方法。发现PPG可以增加H 3 BO 3的消耗，参与并促进PVA的交联反应，并且可以控制水凝胶珠的表面层和核心层的孔径。随着PPG含量的增加，剪切储能模量（G'）和有效网络密度（nu（e））首先增加，在2 wt％PPG存在时达到最大值，然后降低。 PPG含量相对较低可以促进PVA水凝胶中相对均匀和致密的网络结构的形成，从而改善凝胶珠的机械性能和长期水力稳定性。通过添加PPG，可以增强PVA水凝胶的毛细管吸水能力，并且可以很好地保持高渗透性。当用于废水处理中时，固定有活性污泥的PVA水凝胶的吸氧率（OUR）和COD去除率值与PPG的添加无明显差异，并且可以保持较高的微生物活性。

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