DNB去除地浸铀矿山污染地下水中NO_3^-的研究  

Removing NO_3^- from the polluted groundwater in in-situ leaching uranium mine by DNB

作　　者：王清良[1,2] 张国奇[1] 胡鄂明[1] 丁德馨[1] 阳奕汉 蒋小辉 徐屹群 

机构地区：[1]南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]新疆中核天山铀业有限公司,新疆伊宁835000

出　　处：《铀矿冶》2010年第2期82-86,共5页Uranium Mining and Metallurgy

基　　金：国家自然科学基金(50774047)

摘　　要：针对地浸铀矿山污染地下水,开展了溶液pH、ρ(COD)/ρ(NO3-)、不同碳源及温度等因素对反硝化细菌(DNB)去除地浸铀矿山污染地下水中NO3-的影响研究。研究结果表明,DNB去除NO3-最适宜的pH为6~8,pH≤5时NO3-的去除率明显下降,随着NO3-去除过程的进行,溶液趋于中性;ρ(COD)/ρ(NO3-)≥1时,NO3-的去除率可达到90%以上,ρ(COD)/ρ(NO3-)<1时,DNB脱氮受到抑制,适宜的ρ(COD)/ρ(NO3-)为1~1.5;碳源影响DNB脱氮速率,乳酸钠、甲醇、乙酸3种碳源中乳酸钠效果最好;氧化还原电位在-50^-200 mV时,电位绝对值越大DNB脱氮速率越快;溶解氧(DO)对DNB去除NO3-影响较大,(ρDO)<1 mg/L时,DNB脱氮进行顺利;温度对DNB去除NO3-效果影响较大,温度高,DNB去除NO3-速度快,当温度为17℃时,DNB对NO3-仍能保持较好的去除效果。The effects of main factors, such as pH of solution, the ratio of COD concentration to NO3^- concentration, the different kinds of carbon sources and temperature on removing NO3^- by denitrifying bacteria （DNB）, are studied. The experimental results show that the suitable pH value is 6-8. When pHi5, the removal rate of NO3^- decreased. The end pH value of solution is about 7. When the ratio of COD concentration to NO^3- concentrationS1, the removal rate of NO3^- is more than 90%. The suitable ratio of COD concentration to NO3 concentration is about 1-1.5. The different kinds of carbon sources affected the removal rate of NO3^- and the removal effect of NO3^- was the best when sodium lactate was used as carbon source. When oxidation-reduction potential（ORP） was -50-200 mV, the lower the ORP was, the faster the removal rate of NO3^- was by DNB. Dissolved oxygen （DO） affected the removal rate of NO3^-. When DOll rag/L, the removal effect of NO3^- was restrained. The removal rate of NO3^- increased with the increasing of the temperature. When the experimental temperature was 17 ℃, the removal effect of NO3^ was also good.

关 键 词：反硝化细菌 地浸采铀 污染地下水 硝酸根 

分 类 号：X703.1[环境科学与工程—环境工程]