一种同步脱氮脱硫并回收单质硫的新工艺初探  

A new process of simultaneous de-sulfurization and de-nitrification.

作　　者：王爱杰[1] 杜大仲[1] 任南琪[1] 刘春爽[1] 万春黎[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《中国科技信息》2005年第9期56-57,71,共3页China Science and Technology Information

基　　金：国家自然科学基金项目50208006

摘　　要：依据脱氮硫杆菌(Thiobacillus denitrificans)在厌氧(或兼性厌氧)条件具有脱硫反硝化的生理特性,采用分离筛选的脱氮硫杆菌,通过间歇试验考察了同步脱氮脱硫技术的关键因素。试验结果证明了同步脱氮脱硫技术的可行性,提出硫氮比(S2-/NO3-)和硫化物浓度是同步脱氮脱硫技术的主要因素,两者分别控制在5/3和低于300mg/L的水平可以获得较好的脱硫和反硝化效果,在此条件下,单质硫转化率最高达94%。Thiobacillus denitrificans, as a kind of autotrophic facultative bacteria, could oxidize sulfide into elemental sulfurwhen nitrate was adopted as its electron accepter and carbon dioxide as its carbon resource under anaerobic environment.Through this way, nitrate was converted into nitrogen. In addition, Thiobacillus denitrificans has a wide ecological-amplitudeand could accumulate sulfur extracellularly. Based on these special physiological characteristics, an innovative process ofsimultaneous de-sulfide and de-nitrification was developed by authors. Three strains of Thiobacillus denitrificans wereemployed as sulfur-producers in the treatment of wastewater containing sulfide and nitrate in this study. The stoichiometricequations of simultaneous de-sulfide and de-nitrification by Thiobacillus denitrificans was presented. The key factor affectingthis process was investigated through batch tests. The experimental results indicated that the sulfide concentration and theratio of sulfide to nitrate (S2-/ NO3- ratio) in the influent are the key factors. Their suitable level could be controlled at 5/3 and 300mg/L respectively in order to achieve 94% of sulfur conversion rate. If S2-/ NO3- ratio was not over 5/3, sulfurconversion rate will increase with the decrease of S2-/ NO3- ratio.

关 键 词：同步 单质硫 脱氮硫杆菌 工艺 回收 脱氨 生理特性 兼性厌氧 分离筛选 间歇试验 试验结果 脱硫技术 硫转化率 反硝化 硫化物 

分 类 号：X701.3[环境科学与工程—环境工程] X703