餐厨垃圾酸性发酵及其产物为碳源的脱氮特性

发布时间：2018-05-30 17:00

本文选题：餐厨垃圾 + 反硝化　；参考：《中国环境科学》2017年04期

【摘要】：利用餐厨垃圾为基质进行酸性发酵并利用其发酵产物作为反硝化碳源,结果发现发酵过程具有明显的阶段性,即碳水化合物—乳酸—VFAs,这主要与发酵过程中微生物种群的变化关系较大.发酵72h后,Lactobacillus相对丰度达99.3%,乳酸含量达到最大值(45.2g/L).利用不同阶段的发酵液(未发酵、部分发酵、乳酸为主和VFAs为主)作为反硝化碳源时发现,与乙酸钠相似,乳酸为主的发酵液具有良好的反硝化能力(0.15g NO_3~--N/g COD)和较快的反硝化速率[6.1g NO_3~--N/(g VSS·h)],其有机物利用效率较高,厌氧污泥产率低,并在C/N大于5.7时能够实现完全的反硝化.将以乳酸为主的发酵液用于实际污水处理时发现,SBR脱氮效率明显提高.而且不会对硝化过程产生抑制,因此利用餐厨垃圾进行乳酸发酵,不仅能够缩短发酵时间、降低废物处理费用,还能获得优质的反硝化碳源.
[Abstract]:The acid fermentation was carried out by using kitchen waste as the substrate and the fermentation product was used as the carbon source of denitrification. The results showed that the fermentation process had obvious stages. That is carbohydrate-lactic acid-VFAs. this is mainly related to the variation of microbial population during fermentation. After 72 hours of fermentation, the relative abundance of Lactobacillus reached 99.3, and the content of lactic acid reached its maximum value of 45.2 g / L ~ (-1). When the fermentation broth (unfermented, partially fermented, lactic acid and VFAs) was used as carbon source for denitrification, it was found that it was similar to sodium acetate. The fermentation broth dominated by lactic acid had a good denitrification capacity of 0.15 g NO_3~--N/g / COD) and a faster denitrification rate [6.1 g NO_3~--N/(g VSS / h], and its organic matter utilization efficiency was higher, and the anaerobic sludge yield was low, and complete denitrification could be achieved at C / N > 5.7. It was found that the denitrification efficiency of SBR was improved obviously when the fermentation broth with lactic acid was used in actual wastewater treatment. And the nitrification process will not be inhibited. Therefore, lactic acid fermentation with kitchen waste can not only shorten the fermentation time, reduce the cost of waste treatment, but also obtain high quality denitrification carbon source.
【作者单位】：西安建筑科技大学环境与市政工程学院;成都大学建筑与土木工程学院;东北大学市政与环境工程学院;
【基金】：国家自然科学基金资助项目(51508450) 陕西省污水处理与资源化重点科技创新团队(2013KCT-13) 博士后基金(2015M582760XB)
【分类号】：X799

【相似文献】