Study of Nano Zero-Valent Iron on Molasses Alcohol Wastewater Treatment by Anaerobic Digestion

doi:10.3969/j.issn.1673-1689.2019.07.012

Home > Archive>Volume 38, Issue 7, 2019 >86-93. DOI:10.3969/j.issn.1673-1689.2019.07.012

Study of Nano Zero-Valent Iron on Molasses Alcohol Wastewater Treatment by Anaerobic Digestion
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                        10.3969/j.issn.1673-1689.2019.07.012
                    
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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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CHEN Yang, ZHAO Mingxing, RUAN Wenquan. Study of Nano Zero-Valent Iron on Molasses Alcohol Wastewater Treatment by Anaerobic Digestion[J]. Journal of Food Science and Biotechnology,2019,38(7):86-93.

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