摘要
以被硝酸盐氮污染的地下水为研究对象,利用共混/熔融聚合技术将聚乳酸和淀粉混合,制备成兼具碳源和生物载体的缓释碳.并考察不同质量比(聚乳酸∶淀粉为8∶2、7∶3、6∶4、5∶5)的缓释碳在反硝化间歇试验中硝氮、亚硝氮和COD的去除效果,结果表明,当聚乳酸/淀粉质量比为5∶5的缓释碳,其反硝化效果最佳,硝氮去除率达99%;以该比例的缓释碳进行反硝化填充柱连续动态试验时,反应器中反硝化效果显著,出水硝氮浓度在2 mg·L-1以下,为开发环境友好的可控性缓释碳源提供了科学依据.
We used polylactic acid( PLA) and starch to develop a slow-release carbon source and biofilm carrier by blending and fusing techniques for removing nitrate contamination from groundwater,investigated the changes of nitrate,nitrite concentrations and COD in denitrification process supplied by the slow-release carbon source in different mass ratios [PLA /starch( P∶ S) were 8∶ 2,7∶ 3,6∶ 4,5∶ 5,respectively]. The experimental results demonstrated that the best mass ratio of PLA /starch was 5∶ 5,resulting in a nitrate removal rate of more than 99%. A high denitrification performance was achieved in continuous fixed-bed reactor,the effluent nitrate concentration was below 2 mg·L-1. These experiments provide scientific basis for the development of environmentally-friendly and controllable slow-release carbon source.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第6期2236-2240,共5页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07201002-6)
关键词
反硝化
缓释碳源
聚乳酸
淀粉
地下水
denitrification
slow-release carbon source
polylactic acid(PLA)
starch
groundwater
