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首页> 外文期刊>Environmental research >Biodegradation of methylene blue dye in a batch and continuous mode using biochar as packing media
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Biodegradation of methylene blue dye in a batch and continuous mode using biochar as packing media

机译：以生物炭为填充介质分批连续地对亚甲基蓝染料进行生物降解

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摘要

Bacterial species for metabolizing dye molecules were isolated from dye rich water bodies. The best microbial species for such an application was selected amongst the isolated bacterial populations by conducting methylene blue (MB) batch degradation studies with the bacterial strains using NaCl-yeast as a nutrient medium. The most suitable bacterial species was Alcaligenes faecalis (A. faecalis) according to 16S rDNA sequencing. Process parameters were optimized and under the optimum conditions (e.g., inoculum size of 3 mL, temperature of 30 degrees C, 150 ppm, and time of 5 days), 96.2% of MB was removed. Furthermore, the effectiveness for the separation of MB combining bio-film with biochar was measured by a bio-sorption method in a packed bed bioreactor (PBBR) in which microbes was immobilized. The maximum MB removal efficiencies, when tested with 50 ppm dye using batch reactors containing free A. faecalis cells and the same cells immobilized on the biochar surface, were found to be 81.5% and 89.1%, respectively. The PBBR operated in continuous recycle mode at high dye concentration of 500 ppm provided 87.0% removal of MB through second-order kinetics over 10 days. The % removal was found in the order of PSBR Immobilized batch Free cell. The standalone biochar batch adsorption of MB can be described well by the pseudo-second order kinetics (R-2 = 0.978), indicating the major contribution of electron exchange-based valence forces in the sorption of MB onto the biochar surface. The Langmuir isotherm suggested a maximum monolayer adsorption capacity of 4.69 mg g(-1) at 40 degrees C which was very close to experimentally calculated value (4.97 mg g(-1)). Moreover, the Casuarina seed biochar was reusable 5 times.
机译：从富含染料的水体中分离出用于代谢染料分子的细菌。通过使用NaCl-酵母作为营养培养基对细菌菌株进行亚甲基蓝（MB）批处理降解研究，从分离的细菌群体中选择了最佳的微生物菌种。根据16S rDNA测序，最合适的细菌种类是粪便产碱杆菌（A. faecalis）。优化了工艺参数，并在最佳条件下（例如，接种物大小为3 mL，温度为30摄氏度，150 ppm，时间为5天），去除了96.2％的MB。此外，在固定有微生物的填充床生物反应器（PBBR）中，通过生物吸附法测定了分离结合了生物膜和生物炭的MB的有效性。当使用含有游离粪肠球菌细胞和固定在生物炭表面的相同细胞的分批反应器以50 ppm染料测试时，最大MB去除效率分别为81.5％和89.1％。 PBBR以500 ppm的高染料浓度在连续循环模式下运行，可在10天内通过二级动力学除去87.0％的MB。以PSBR>固定批次>游离细胞的顺序发现％去除。 MB的独立生物炭批吸附可以通过拟二级动力学（R-2> = 0.978）很好地描述，表明基于电子交换的化合价在MB吸附到生物炭表面上的主要贡献。 Langmuir等温线表明在40摄氏度时最大单层吸附容量为4.69 mg g（-1），非常接近实验计算值（4.97 mg g（-1））。此外，木麻黄种子生物炭可重复使用5次。

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  • 来源
    《Environmental research》 |2019年第4期|356-364|共9页
  • 作者

    Bharti Vikash; Vikrant Kumar; Goswami Mandavi; Tiwari Himanshu; Sonwani Ravi Kumar; Lee Jechan; Tsang Daniel C. W.; Kim Ki-Hyun; Saeed Mohd; Kumar Sunil; Rai Birendra Nath; Giri Balendu Shekher; Singh Ram Sharan;

  • 作者单位

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Hanyang Univ, Dept Civil & Environm Engn, 222 Wangsimni Ro, Seoul 04763, South Korea;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Ajou Univ, Dept Environm & Safety Engn, 206 Worldcup Ro, Suwon 16499, South Korea;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

    Hanyang Univ, Dept Civil & Environm Engn, 222 Wangsimni Ro, Seoul 04763, South Korea;

    Univ Hail, Coll Appl Med Sci, Dept Clin Lab Sci, POB 2440, Hail, Saudi Arabia;

    Natl Environm Engn Res Inst, CSIR, Solid & Hazardous Waste Management Div, Nehru Marg, Nagpur 440020, Maharashtra, India;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

    Banaras Hindu Univ, Indian Inst Technol, Ctr Adv Study, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India;

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  • 正文语种 eng
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  • 关键词

    Dye removal; Immobilized bacterium; Pollution control; Engineered biochar; DNA sequencing;

    机译：染料去除;固定化细菌;污染控制;工程生物炭;DNA测序;

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