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过程工程学报 ›› 2022, Vol. 22 ›› Issue (11): 1584-1592.DOI: 10.12034/j.issn.1009-606X.221418

• 研究论文 • 上一篇    下一篇

碱化膨润土-海藻酸钙固定化颗粒作为微生物载体对微污染废水的处理性能

刘晓玉1,2， 张亦飞1*， 邓立聪1,2   

  1. 1. 中国科学院过程工程研究所绿色制造创新研究院，绿色过程与工程重点实验室，湿法冶金清洁生产技术国家工程实验室，北京 100190 2. 中国科学院大学，北京 100049
  • 收稿日期:2021-12-14 修回日期:2022-02-11 出版日期:2022-11-28 发布日期:2022-11-28
  • 通讯作者: 张亦飞 yfzhang@ipe.ac.cn
  • 作者简介:刘晓玉(1998-)，女，河北省石家庄市人，硕士研究生，材料学专业，E-mail: liuxiaoyu19@mails.ucas.ac.cn；通讯联系人，张亦飞，E-mail: yfzhang@ipe.ac.cn.
  • 基金资助:
    国家自然科学基金

Performance of alkaline bentonite?calcium alginate immobilized particles for micro?polluted wastewater treatment as microbial carriers

Xiaoyu LIU1,2,  Yifei ZHANG1*,  Licong DENG1,2   

  1. 1. Key Laboratory of Green Process and Engineering and National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Innovation Academy for Green Manufacture, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

    2. University of Chinese Academy of Sciences, Beijing 100049, China

  • Received:2021-12-14 Revised:2022-02-11 Online:2022-11-28 Published:2022-11-28
  • Contact: ZHANG Yi-fei yfzhang@ipe.ac.cn
  • Supported by:
    the national nature science Foundation of China

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摘要： 近年来，微污染景观水体表现出氨氮、化学需氧量(COD)超标的水质恶化趋势。使用吸附材料是解决该现状的有效途径之一，但是这类材料往往不具备原位长期稳定的处理性能。针对这一问题，本工作选用生物相容性良好的海藻酸钙作为固定剂，制备得到碱化膨润土-海藻酸钙固定化颗粒，探究固定化颗粒作为微生物载体对模拟微污染水体中NH3-N和COD的去除效果。通过溶胶凝胶法采用海藻酸钙固定不同浓度NaOH溶液碱化的膨润土合成系列碱化膨润土-海藻酸钙固定化颗粒。通过扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)、Zeta测试、BET比表面积测试对制备得到的系列碱化膨润土及固定化颗粒进行表征，并分析固定化颗粒作为微生物载体对微污染废水的处理性能。研究结果表明，0.5 mol/L NaOH溶液处理的膨润土具有最低的Zeta电位(-27.4 mV)，其表面电负性增强，且表面片层状结构增加。制备的0.5B-CA固定化颗粒比表面积最大，为12.1 m2/g，比膨润土原土合成的固定化颗粒(0B-CA)比表面积增加了28%，有利于微生物附着生存。0.5B-CA固定化颗粒作为微生物载体显示出最佳的NH3-N和COD去除性能。在10周期处理中，所有处理后废水的NH3-N浓度和COD浓度均分别降至1和20 mg/L以下，达到了国家地表水环境III类水标准。本工作制备的碱化膨润土-海藻酸钙固定化颗粒作为微生物载体，在污水处理中同时发挥膨润土的吸附作用与微生物的去除作用，对NH3-N和COD有着优异的去除性能及长期稳定的去除能力，为其在实际场景的应用提供了可能。

关键词: 微污染废水, 碱化, 膨润土, 海藻酸钙

Abstract: In recent years, the water quality of micro-polluted landscape water shows the deterioration trend of ammonia nitrogen and chemical oxygen demand (COD) exceeding the standard. The use of adsorption materials is one of the effective ways to solve this situation, but such materials often do not have long-term stable in-situ treatment performance. To solve this problem, the alkalized bentonite-calcium alginate immobilized particles were prepared by using calcium alginate with good biocompatibility as a fixative. And the removal effect of NH3-N and COD in simulated micro-polluted water was investigated by using immobilized particles as microbial carriers. A series of alkalized bentonite-calcium alginate immobilized particles were synthesized by sol-gel method using calcium alginate to fix alkaline bentonite, which was treated with different concentrations of NaOH solution. The prepared alkaline bentonite and immobilized particles were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Zeta test and BET specific surface area test. Meanwhile, the treatment performance of immobilized particles on micro-polluted wastewater as microbial carriers was analyzed. The results showed that the bentonite treated with 0.5 mol/L NaOH solution increased surface lamellar structure, and had the lowest Zeta potential of -27.4 mV, which meant that the surface electronegativity was enhanced. 0.5B-CA immobilized particles had the maximum BET specific surface area of 12.1 m2/g, which was 28% higher than that of 0B-CA immobilized particles, providing more sites for microbial attachment. 0.5B-CA immobilized particles as microbial carriers had the best removal effect on NH3-N and COD. In the 10 cycles of treatment, the concentration of NH3-N and COD in all treated wastewater were reduced to below 1 and 20 mg/L, respectively, reaching the national surface water environment class III water standard. The combination of adsorption of bentonite as adsorption matrix and microbial removal makes the material as microbial carrier show excellent removal performance and long-term stable removal ability of NH3-N and COD, which provides the possibility for its application in practical scenes.

Key words: micro-polluted wastewater, alkaline, bentonite, calcium alginate