| 提高沼液生物有效性的曝气参数优化 |
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| 引用本文： | 张邦喜,孙巧萍,李恕艳,李国学,杜龙龙,王雅雅,袁京,张地方.提高沼液生物有效性的曝气参数优化[J].农业工程学报,2016,32(Z2):226-232. |
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| 作者姓名： | 张邦喜 孙巧萍 李恕艳 李国学 杜龙龙 王雅雅 袁京 张地方 |
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| 作者单位： | 1. 中国农业大学资源与环境学院,北京 100193; 贵州省农业资源与环境研究所,贵阳 550006;2. 中国农业大学资源与环境学院,北京,100193 |
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| 基金项目： | 国家重点研发计划项目（2016YFD0800601）;国家"十二五"科技支撑项目（2012BAD14B01和2012BAD14B06） |
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| 摘 要： | 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、p H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、p H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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| 关 键 词： | 氨基酸 生物毒性 优化 曝气 沼液 |
| 收稿时间： | 2016/7/13 0:00:00 |
| 修稿时间： | 2016/9/20 0:00:00 |
Aeration parameter optimization for improving biological effectiveness of biogas slurry |
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| Zhang Bangxi,Sun Qiaoping,Li Shuyan,Li Guoxue,Du Longlong,Wang Yay,Yuan Jing and Zhang Difang.Aeration parameter optimization for improving biological effectiveness of biogas slurry[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(Z2):226-232. |
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| Authors: | Zhang Bangxi Sun Qiaoping Li Shuyan Li Guoxue Du Longlong Wang Yay Yuan Jing and Zhang Difang |
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| Institution: | 1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China; 2. Guizhou Institute of Agricultural Resources and Environment, Guiyang 550006, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China,1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China and 1. College of Resource and Environment Science, China Agricultural University, Beijing 100193, China |
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| Abstract: | Abstract: 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 were applied by compounding MLSS, HRT, gas-water ratio and pH. Our aim was finding out the regulation of nutrient variation biogas slurry through the aeration by the investigation of amino acid, major element and GI, screening the suitable aeration rate, and proving the changes of the biogas slurry before and after aeration through the hydroponic experiment of Maize. We also observed maize grow to determine the parameters of the slurry which matched the due need of maize growth. The results showed that the aeration treatment could reduce the ammonia nitrogen, total phosphorus content, and biological toxicity in biogas slurry, and the biological toxicity decreased significantly after aerobic sludge was added. The amino acid content in biogas slurry fluctuated under aeration treatment. The optimization aeration parameters for keeping the maximum content was 8000 mg/L for MLSS, 2h for Hydraulic retention time (HRT), 20:1 for gas water ratio, and 8.5 for pH. The optimization aeration parameters for reducing the biotoxicity was 6000 mg/L for MLSS, 1h for Hydraulic retention time (HRT), 40:1 for gas water ratio, and 6.5 for pH. Through maize hydroponics experiment, the optimization parameters was 8000 mg/L for MLSS, 2h for Hydraulic retention time (HRT), 20:1 for gas water ratio, and 8.5 for pH , which was the optimization aeration parameters for keep the maximum content. Comparing the two optimization procedures concerning maize hydroponic experiments, we found maize grew better in the biogas slurry with optimized amino acid content but on contrary, maize in slurry with reduced biological toxicity grew worse than those in untreated slurry. The present results would provide useful information and technical proof on further research of effective usage of biogas slurry along with reducing the risk of environmental pollution and ultimately achieve the goal of agricultural pollution reduction. |
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| Keywords: | amino acid biological toxicity optimization aeration biogas slurry |
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