赤霉素菌渣与餐厨垃圾混合厌氧消化特性研究

发布时间：2018-01-22 03:32

  本文关键词： 赤霉素菌渣 餐厨垃圾 混合厌氧消化　出处：《南昌大学》2016年硕士论文　论文类型：学位论文

【摘要】：赤霉素作为一种农用抗生素因其具有植物生长促进作用而被广泛用于农业生产。赤霉素生产过程中会产生赤霉素菌渣,赤霉素菌渣中含有丰富的有机物以及少量的赤霉素残留。赤霉素菌渣对周边环境造成了潜在的环境风险,已经成为药品生产企业的重要难题。本课题通过对赤霉素菌渣预处理及其可厌氧生化性能进行研究并进一步研究菌渣和餐厨垃圾的混合厌氧消化特性,以期为生产应用提供一定的理论研究基础和技术支撑。本研究的主要内容及结论如下:(1)采用碱热联合工艺对菌渣进行预处理,正交实验设计结果表明:碱热预处理能有效地提高菌渣的水解效果,SCOD的溶解率最高可达65.26%,产气量也得到提高。影响菌渣预处理的主要因素为加碱量、预处理时间和温度,综合考虑确定后续实验预处理条件为预处理温度65℃、加碱量6%、预处理时间30 min。(2)在中温条件下进行不同混合比例的静态发酵试验。实验结果表明:提高餐厨垃圾混合比例,可以有效地提高系统产气量及有机物去除率,但系统的稳定性指标会降低。赤霉素菌渣和餐厨垃圾的混合比2:1时最高产气率、有机物去除率分别为103.2 mL/d、45.2%,相对于赤霉素菌渣单独厌氧发酵分别提高339.14%、34.12%,且系统稳定性指标VFA/碱度稳定在0.5左右,综合考虑系统效率和稳定性比较确定2:1为最佳混合比例。(3)在35℃、45℃、55℃三个CSTR设备以最佳混合比例2:1分别以1gVS/(L·d)作为启动负荷进行为期158天厌氧发酵动态试验。实验结果表明:35℃、45℃、55℃系统最大可容忍负荷分别为5 gVS/(L·d)、6 gVS/(L·d)、7gVS/(L·d),系统稳定期平均最大产气量分别为670 mL/d、720 mL/d、760 mL/d。高温系统日产气量最大,系统稳定性较差。中温35℃系统,在可容忍范围内,增大有机负荷可以提高系统产气率,有机物去除率。综合得出35℃,4 gVS/(L·d),赤霉素菌渣与餐厨垃圾混合比例为2:1为厌氧发酵性能最佳状态。
[Abstract]:As an agricultural antibiotic, gibberellin is widely used in agricultural production because of its plant growth promoting effect. Gibberellin bacteria residue is produced in the process of gibberellin production. Gibberellin residue is rich in organic matter and a small amount of gibberellin residue. Gibberellin residue poses a potential environmental risk to the surrounding environment. Through the pretreatment of gibberellin bacteria residue and its anaerobic biochemical properties of the study and further study of the mixed anaerobic digestion characteristics of bacteria residue and kitchen waste. The main contents and conclusions of this study are as follows: 1. Pretreatment of bacteria residue by alkali heat combined process. The results of orthogonal experiment showed that alkali thermal pretreatment could effectively improve the hydrolysis effect of bacteria residue and the highest solubility of Scod could be up to 65.26%. The main factors affecting the pretreatment of bacteria residue were alkali addition, pretreatment time and temperature. The following experimental pretreatment conditions were determined comprehensively: pretreatment temperature 65 鈩，

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