农业工程学报2016，Vol.32Issue(z2)：226-232,7.DOI:10.11975/j.issn.1002-6819.2016.z2.031
提高沼液生物有效性的曝气参数优化
Aeration parameter optimization for improving biological effectiveness of biogas slurry
摘要
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.关键词
氨基酸/生物毒性/优化/曝气/沼液Key words
amino acid/biological toxicity/optimization/aeration/biogas slurry分类
资源环境引用本文复制引用
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):226-232,7.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 （）
