摘要
地下水中硝酸盐污染严重,采用室内试验装置,研究了以芦苇秸秆为碳源去除地下水中的硝酸盐的影响因素和效果,并探讨NO2--N的积累规律.研究表明:①在反硝化过程中,总有机碳TOC与NO3--N之间存在负相关性,而NO3--N与HCO3-之间存在一定的负相关性;②要使处理后地下水中NO3--N满足质量标准20mg·L-1,出水TOC浓度需达到一定值;③实验中当出水C/N小于1时NO2--N开始出现积累,NO2--N积累与出水C/N之间满足一定的规律;最佳C/N约为1,可以同时满足出水NO3--N、TOC、NO2--N的要求.
The factors influential on nitrate removal in groundwater were studied in laboratory equipment containing unprocessed reed stalks and sand and the rule governing nitrite accumulation was found.The results showed that：①Negative correlation existed between the TOC and NO3^--N,while negative correlation existed between the NO3^--N and HCO3- .②Some TOC was demanded if the NO3^--N was to meet the quality standards（20mg·L^-1）.③Nitrite accumulated when the C/N ratios were less than 1.00 and there were some rules between nitrite accumulation and C/N ratios.The optimal C/N ratio was assumed to be 1.00,at which more removal of NO3^--N is achieved with less excess TOC and NO2^--N in the effluent.
基金
国家自然科学基金(40672154
40872166)
新世纪优秀人才计划项目(NCET-06-0541)资助
