CANNED工艺电化学生物反硝化段的电化学脱氮效能  

Study on the Electrochemical Nitrogen Removal Efficiency in the Bio-electrochemical Denitrification Part of CANNED Process

作　　者：张娜[1,2] 王海燕[2] 许吉现[1] 周岳溪[2] 万风[1] 柳栋升[2] 庞朝辉[2] 

机构地区：[1]河北工程大学城市建设学院,河北邯郸056038 [2]中国环境科学研究院水污染控制技术研究中心,北京100012

出　　处：《环境工程技术学报》2012年第2期96-102,共7页Journal of Environmental Engineering Technology

基　　金：国家自然科学基金项目(50708120)

摘　　要：研究了HRT为24h,电流密度为0.052mA/cm^2,纯电化学条件下进水氮形态分别为NO_2^--N,NH_4^+-N和NO_2^--N+NH_4^+-N三种情况下,生物挂膜前亚硝化/电化学生物反硝化全自养脱氮工艺(CANNED)中的电化学生物反硝化段的电化学脱氮效能。结果表明,当只投加NO_2^--N,浓度从100mg/L增加到400mg/L时,电化学生物反硝化段对NO_2^--N的去除率随其浓度的增大而减小,从40%左右逐渐降至20%左右,可能是由自配水中恒定的Cl^-所生成的HClO氧化造成;当只投加NH_4^+-N,浓度从100mg/L增加到400mg/L时,电化学生物反硝化段对NH_4^+-N的去除率均为35%左右,主要因为自配水中的NH_4^+-N是以NH_4Cl形式投加,随着NH_4^+-N浓度的增加Cl^-浓度也增加,能与NH_4^+-N反应的HClO增多;当同时投加NO_2^--N和NH_4^+-N时,NO_2^--N和NH_4^+-N的去除率与各自单独投加时相比几乎没有变化,说明在电化学条件下,自配水中Cl^-对NO_2^--N,NH_4^+-N均有一定的去除,且NH_4^+-N和NO_2^--N的去除之间没有相互影响。The electrochemical nitrogen removal efficiency in a bio-electrochemical denitrification part of Complete Autotrophic Nitrite-nitrification and Electrochemical Bio-denitrification Combined Process （CANNED） was studied before the biofilm inoculation stage under pure electrochemical conditions, which was 24 h HRT and 0.052 mA/ cm2 electric current density, when the influent nitrogen forms were NO2 - -N, NH4 ＋ -N and NO2 - -N ＋ NH4 ＋ -N, respectively. The results were shown as follows： When only NO2 --N was added and the NO2 --N influent concentration increased from 100 mg/L to 400 mg/L, NO2 --N was removed partially by the bio-electrochemical part but the NO＋--N removal efficiency reduced gradually from 40% to about 20%, which was might due to the oxidation of HCIO produced from the influent constant CI - concentration. When only NH4 ＋ -N was added and the influent NH4 ＋ -N removal efficie in the influent concentration increased from 100 mg/L to 400 mg/L, the was kept about 35%. This was mainly because that NH4 ＋ -N ncy and bio-electrochemical part NH4 ＋-N was supplied in the form of NH4C1 the concentration of CI- and HC10 reacted with NH4 ＋ -N increased with the NH4 ＋ -N increasing accordingly. When NO2 --N and NH4＋ -N were both added, the removal efficiency of each individual ion was almost the same as the NO2 --N and NH4 ＋ -N were added separately. The results showed that NH4 ＋ -N and NO2 --N were removed partially by the influent and NO2 --N removal under the electrochemical C1- and there was no electrochemical interaction of the NH4 ＋ -N conditions in the bio - electrochemical part of CANNED.

关 键 词：CANNED 电化学 脱氮效能 NO2--N NH4+-N Cl- 

分 类 号：X703[环境科学与工程—环境工程]