提高沼液生物有效性的曝气参数优化

发布时间：2018-06-10 10:22

本文选题：氨基酸 + 生物毒性　；参考：《农业工程学报》2016年S2期

【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。
[Abstract]:Aeration treatment is widely used in the pretreatment of drip irrigation of biogas liquid. Reasonable aeration is beneficial to the growth of crops and the blockage occurs in the subsequent drip irrigation of biogas liquid, but the relevant technological parameters are lacking at present. Based on this, the optimization of the parameters affecting aeration process was carried out by improving the bioavailability of biogas liquid. The results showed that aeration could reduce the contents of ammonia nitrogen, total phosphorus and biological toxicity in the biogas liquid, and the decrease was more obvious when aerobic sludge was added. In order to maintain the amino acid content in the biogas as the evaluation index, The optimal aeration parameters were as follows: aerobic sludge 8000 mg / L, HRT 2 h, air-water ratio 20 g / H 8.5. The optimal aeration parameters were: aerobic sludge 6000 mg / L, HRT 1 h, air-water ratio 40 g / H 6.5. The results of hydroponics test showed that the optimal concentration of amino acid in biogas liquid was more favorable for maize growth, but the growth of maize was poor in the optimization scheme based on reducing biogas toxicity. Even worse than the unoptimized scheme.
【作者单位】：中国农业大学资源与环境学院;贵州省农业资源与环境研究所;
【基金】：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)
【分类号】：S216.4;X71

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