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纳米零价铁强化糖蜜乙醇废水厌氧处理效果
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Study of Nano Zero-Valent Iron on Molasses Alcohol Wastewater Treatment by Anaerobic Digestion
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DOI：10.3969/j.issn.1673-1689.2019.07.012
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中文关键词: 纳米零价铁 糖蜜乙醇废水 厌氧消化 胞外聚合物 脱氢酶
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英文关键词: nano zero-valent iron,molasses alcohol wastewater,anaerobic digestion,extracellular polymeric substance,dehydrogenase enzyme
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基金项目:
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摘要点击次数: 7
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全文下载次数: 13
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中文摘要:
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研究了外源添加纳米零价铁（NZVI）对糖蜜乙醇废水厌氧处理的作用以及NZVI对厌氧微生物活性和厌氧消化效果的影响。向厌氧消化体系中分别添加0、0.025、0.05、0.10、0.25、0.50、2.50 g NZVI进行批次实验。结果表明，随着NZVI添加量的增加，糖蜜乙醇废水的厌氧处理效率先升高后降低。添加0.50 g NZVI实验组的COD降解率、产气率和气体中甲烷含量最高，分别为71.1%、310.9 mL/g COD和58%，比空白组提高14.7%、35.6 mL/g COD和18.8%；反应结束时该组COD和硫化物质量浓度最低，分别为2 400 mg/L和33.3 mg/L。NZVI添加量为2.5 g实验组SO42-去除效率和污泥胞外聚合物（EPS）含量最高，硫酸根最终质量浓度为288.2 mg/L，去除率为72.8%，是空白组的1.93倍；EPS中蛋白质和多糖质量分数分别为46.00 mg/gVSS和5.05 mg/gVSS，分别是空白实验组的4.43和1.66倍。脱氢酶活性在添加0.50 g NZVI的实验组中最高，为340.3 TF μg/（mL·h），比空白组提高192.5 TF μg/（mL·h）。
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英文摘要:
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The effects of adding nano zero valent iron（NZVI） on the anaerobic disposal of molasses alcohol wastewater，the effects of NZVI on the anaerobic microbial activity were studied in this study. Batch experiments were carried out by adding 0，0.025 g，0.05 g，0.10 g，0.25 g，0.50 g and 2.50 g NZVI，respectively to the anaerobic digestion systems. The results indicated that the treatment efficiency of molasses alcohol wastewater was first increased then decreased when NZVI was added. The COD degradation rate，biogas generation rate and methane content was maximum at the group of 0.50 g NZVI was added，the values were 71.1%，310.9 mL/g COD and 58% ，which was 14.7%，35.6 mL/g COD and 18.8% higher than those of the control group，respectively. The concentration of COD and sulfide in the wastewater were the lowest at the end of the reaction，which were 2 400 mg/L and 33.3 mg/L，respectively. The degradation rate of sulfate radical and the concentration of extracellular polymeric substance（EPS） were the highest in the experimental group with 2.50 g NZVI. Finally，the concentration of sulfate radical was 288.2 mg/L and the removal rate of sulfate radical was 72.8% ，which was 1.93 times as much as that of the control group. The concentration of protein and polysaccharide in this group were 46.00 mg/gVSS and 5.05 mg/gVSS，which were 4.43 and 1.66 times of the control group，respectively. The activity of dehydrogenase reached the maximum value of 340.3 TF μg/（mL·h） when 0.5g NZVI was added，it was192.5 TF μg/（mL·h） higher than the control group.
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