提高沼液生物有效性的曝气参数优化
曝气处理广泛用于沼液滴灌前处理中，合理的曝气有利于农作物生长，降低沼液后续滴灌时发生堵塞，但目前缺乏相关工艺参数。基于此，该文从提高沼液农用生物有效性入手，对影响曝气过程的相关参数进行优化研究。结果表明，曝气能够降低沼液中氨氮、总磷含量和生物毒性，且添加好氧污泥情况下下降更明显。以保持沼液中氨基酸含量作为评价指标时，最优曝气参数为：好氧污泥量8000 mg/L、水力停留时间2h、气水比20、pH值8.5；以降低沼液生物毒性为目标的优化曝气参数为：好氧污泥量6000 mg/L、水力停留时间1h、气水比40、pH值6.5。通过玉米水培试验对2种优化方案进行验证，沼液氨基酸浓度的优化方案更利于玉米生...
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| Published in | 农业工程学报 Vol. 32; no. z2 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
2016
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 曝气处理广泛用于沼液滴灌前处理中，合理的曝气有利于农作物生长，降低沼液后续滴灌时发生堵塞，但目前缺乏相关工艺参数。基于此，该文从提高沼液农用生物有效性入手，对影响曝气过程的相关参数进行优化研究。结果表明，曝气能够降低沼液中氨氮、总磷含量和生物毒性，且添加好氧污泥情况下下降更明显。以保持沼液中氨基酸含量作为评价指标时，最优曝气参数为：好氧污泥量8000 mg/L、水力停留时间2h、气水比20、pH值8.5；以降低沼液生物毒性为目标的优化曝气参数为：好氧污泥量6000 mg/L、水力停留时间1h、气水比40、pH值6.5。通过玉米水培试验对2种优化方案进行验证，沼液氨基酸浓度的优化方案更利于玉米生长，而玉米在基于降低沼液生物毒性的优化方案中的生长情况较差，甚至劣于未优化方案。 |
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| Bibliography: | amino acid;biological toxicity;optimization;aeration;biogas slurry Biogas has been well developed as one of the key technologies for achieving a virtuous circular modern agriculture, with environmental benefits that no chemical fertilizer compares with. However, large amount of improperly disposed biogas slurry may cause serious environmental problems, as the biogas slurry from livestock manure has high biological toxicity for high molecular solid organic compounds during anaerobic digestion. Thus, various studies and experiments have been conducted to achieve the goal that biogas slurry could be cleansed scientifically and used safely in the vast rural area. Among them, aeration treatment was widely used for biogas slurry in drip irrigation and had been proved a constructive method that advanced crop growth when adopted appropriately. However, there was limited information available on aeration parameters. In this study, we discussed the influence of aeration on nutrient and toxicity of biogas slurry which we |
| ISSN: | 1002-6819 |