餐厨垃圾制备高性能反硝化碳源的厌氧发酵条件优化  

Optimization of Anaerobic Fermentation Conditions for the Preparation of High-performance Denitrified Carbon Sources with Food Waste

作　　者：梁曼丽 袁维波 敖冬 高婷婷 李倩[3] 陈荣[3] LIANG Manli;YUAN Weibo;AO Dong;GAO Tingting;LI Qian;CHEN Rong(Tongfang Water Group Co.Ltd.,Nanjing Jiangsu 210046;School of Environmental and Chemical Engineering,Xi’an Polytechnic University,Xi’an Shaanxi 710055;School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an Shaanxi 710055)

机构地区：[1]同方水务集团有限公司,江苏南京210046 [2]西安工程大学环境与化学工程学院,陕西西安710055 [3]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《环境卫生工程》2022年第5期60-66,共7页Environmental Sanitation Engineering

基　　金：企业横向合作项目(2020-031);陕西省自然科学基础研究计划项目(2021JQ-684,2020JQ-835);陕西省教育厅专项科研计划项目(21JK0665)。

摘　　要：利用餐厨垃圾厌氧发酵液作为碳源是改善污水处理厂脱氮效果的有利途径,因此,提高发酵产物中易被反硝化菌利用的小分子有机酸值得研究。结合厌氧发酵制约因素,着重研究pH对餐厨垃圾发酵液中挥发性有机酸和乳酸等小分子有机酸的组成及其反硝化性能的影响。结果发现,pH调节有利于水解和酸化过程,不同pH下的小分子有机酸浓度无显著差异;且pH调节至5时,虽然发酵产物中溶解性碳源浓度较低,但其中乳酸和小分子有机酸的占比最高,分别为67.77%和93.04%。利用不同pH的发酵液作为碳源的反硝化性能试验结果表明,pH调节同样有利于提高其反硝化性能;发酵液中乳酸含量越高,其发酵液反硝化能力越强、反硝化速率越快,且更不容易导致NO_(2)^(-)-N积累。综合而言,pH调节至5时,其溶解性碳源浓度会受限于水解作用,但其组成更适合作为反硝化的碳源。Taking food waste anaerobic fermentation broth as a carbon source had been a favorable way to improve the denitrification effect of sewage treatment plants. Therefore,it was worth studying to improve the small molecular organic acids in the fermentation products that were easily utilized by denitrifying bacteria. Combined with the restriction factors of anaerobic fermentation,the effects of pH on the composition and denitrification performance of volatile organic acids and organic acids such as lactic acid in food waste fermentation broth were studied. The results showed that pH adjustment was conducive to the hydrolysis and acidification process,there was no significant difference of organic acids concentration at different pH. And when the pH was adjusted to five,though the soluble carbon sources in the fermentation products was low,but the concentration of lactic acid and organic acid was highest in the soluble fermentation products,reached 67.77%and 93.04%,respectively. The denitrification performance of using fermentation broth with different pH as carbon sources was tested. The result showed that pH adjustment was also beneficial to improve its denitrification performance,the higher of lactic acid content in the fermentation broth,the stronger the denitrification capacity of the fermentation broth was,the faster the denitrification rate was,and it was less likely to lead to the accumulation of NO_(2)^(-)-N accumulation. In summary,when the pH was adjusted to 5,the concentration of the soluble carbon source would be limited by hydrolysis,but its composition was more suitable as a carbon source for denitrification.

关 键 词：餐厨垃圾 pH 挥发性有机酸 乳酸 反硝化 

分 类 号：X705[环境科学与工程—环境工程]