混合液回流比和外碳源对反硝化脱氮效能的影响
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摘要
针对某城镇污水处理厂存在垃圾渗滤液间歇性排入导致进水碳氮比值较低的问题,为确保出水总氮稳定达标,进行了混合液回流比优化调控和外碳源乙酸钠投加对反硝化脱氮效果影响的生产性试验研究。结果表明,当C/N(COD/TN)值为4. 48～6. 97,且混合液回流比分别为200%和300%时,对TN的平均去除率分别为50. 18%和61. 88%,混合液回流比调增可在一定程度上提升TN去除率,但出水TN平均浓度的降低较为有限。根据进水水质与出水硝酸盐浓度水平,以投加乙酸钠的理论计算量为基础,发现当混合液回流比为300%且乙酸钠投加量为理论投加量的1. 3倍(182 mg/L污水)时,反硝化脱氮效能显著提升,出水TN浓度达到一级A标准,乙酸钠药剂成本约为0. 55元/m~3污水。
One wastewater treatment plant has a low C/N (COD/TN) ratio due to the intermittent landfill leachate influent. A experimental study was conducted to investigate the effect of mixed liquor recycle ratio and additional external carbon source on the removal of TN,and to reduce TN concentration in effluent to satisfy the discharge standard. When the C/N ratio was 4. 48-6. 97,and the mixed liquor recycle ratio was 200% and 300%,the average removal rates of TN in effluent were 50. 18% and 61. 88%,respectively. The results indicated that the increase of the mixed liquor recycle ratio improved the removal efficiency of TN to a certain extent,but it had limited benefit to the decrease of TN average concentration in effluent. Based on the influent characteristics and nitrate concentration in effluent,the theoretical dosage of sodium acetate was calculated. The results showed that,with the mixed liquor recycle ratio of 300% and 1. 3 times of the theoretical dosage of sodium acetate (182 mg/L wastewater),the denitrification efficiency increased significantly and the TN in effluent had met the first level A standard specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The cost of sodium acetate was about 0. 55 yuan/m~3 wastewater.
One wastewater treatment plant has a low C/N (COD/TN) ratio due to the intermittent landfill leachate influent. A experimental study was conducted to investigate the effect of mixed liquor recycle ratio and additional external carbon source on the removal of TN,and to reduce TN concentration in effluent to satisfy the discharge standard. When the C/N ratio was 4. 48-6. 97,and the mixed liquor recycle ratio was 200% and 300%,the average removal rates of TN in effluent were 50. 18% and 61. 88%,respectively. The results indicated that the increase of the mixed liquor recycle ratio improved the removal efficiency of TN to a certain extent,but it had limited benefit to the decrease of TN average concentration in effluent. Based on the influent characteristics and nitrate concentration in effluent,the theoretical dosage of sodium acetate was calculated. The results showed that,with the mixed liquor recycle ratio of 300% and 1. 3 times of the theoretical dosage of sodium acetate (182 mg/L wastewater),the denitrification efficiency increased significantly and the TN in effluent had met the first level A standard specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The cost of sodium acetate was about 0. 55 yuan/m~3 wastewater.
引文
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[2]赵宗升,刘鸿亮,李炳伟,等.高浓度氨氮废水的高效生物脱氮途径[J].中国给水排水,2001,17(5):24-28.Zhao Zongsheng,Liu Hongliang,Li Bingwei,et al.Pathways of efficient biological nitrogen removal from wastewater with high ammonia nitrogen concentration[J].China Water&Wastewater,2001,17(5):24-28(in Chinese).
[3]余建恒,赵淑贤,夏耿东,等.接入垃圾渗滤液对城市污水厂运行的影响与对策[J].中国给水排水,2010,26(4):95-97.Yu Jianheng,Zhao Shuxian,Xia Gengdong,et al.Impact and countermeasures of treating landfill leachate in municipal sewage treatment plant[J].China Water&Wastewater,2010,26(4):95-97(in Chinese).
[4]Henze M.Capabilities of biological nitrogen removal process from wastewater[J].Water Science&Technology,1991,23:9-11.
[5]Her J J,Huang J S.Influences of carbon source and C/N ratio on nitrate/nitrite denitrification and carbon breakthrough[J].Bioresour Technol,1995,54(1):45-51.
[6]Nyberg U,Andersson B,Aspegren H.Long-term experiences with external carbon sources for nitrogen removal[J].Water Sci Technol,1996,33(12):109-116.
[7]马勇,彭永臻,王淑莹.不同外碳源对污泥反硝化特性的影响[J].北京工业大学学报,2009,35(6):820-824.Ma Yong,Peng Yongzhen,Wang Shuying.Sludge denitrification characteristics with different external carbon source[J].Journal of Beijing University of Technology,2009,35(6):820-824(in Chinese).
[8]孙永利,许光明,游佳,等.城镇污水处理厂外加商业碳源的选择[J].中国给水排水,2010,26(19):84-86.Sun Yongli,Xu Guangming,You Jia,et al.Selection of external carbon source for municipal wastewater treatment plant[J].China Water&Wastewater,2010,26(19):84-86(in Chinese).
[9]殷芳芳,王淑莹,昂雪野,等.碳源类型对低温条件下生物反硝化的影响[J].环境科学,2009,30(1):108-113.Yin Fangfang,Wang Shuying,Ang Xueye,et al.Effects of carbon source types on denitrification performance at low temperature[J].Environmental Science,2009,30(1):108-113(in Chinese).
[10]杨巧林,奚小英,陈娜,等.外加碳源对污水厂异常进水时的强化脱氮效果[J].中国给水排水,2011,27(3):106-108.Yang Qiaolin,Xi Xiaoying,Chen Na,et al.Enhanced nitrogen removal efficiency of external carbon source during abnormal influent in municipal wastewater treatment plant[J].China Water&Wastewater,2011,27(3):106-108(in Chinese).
[11]许方园,李勇,黄勇.内回流比对连续流改进A2/O反应器性能的影响[J].水处理技术,2009,35(8):59-62.Xu Fangyuan,Li Yong,Huang Yong.Effect of inner circumfluence rate on the performance of continuous-flow improved A2/O reactor[J].Technology of Water Treatment,2009,35(8):59-62(in Chinese).
[12]周丹,周雹.污水脱氮工艺中外部碳源投加量简易计算方法[J].给水排水,2011,39(11):38-41.Zhou Dan,Zhou Bao.A simple method for calculating external carbon source addition in sewage denitrification process[J].Water&Wastewater Engineering,2011,39(11):38-41(in Chinese).
[13]梁建海.大庆生活污水处理厂脱氮除磷技术改造研究[D].长春:吉林大学,2013.Liang Jianhai.Treatment of Denitrification and Dephosphorization Technology in Sewage Plant[D].Changchun:Jilin University,2013(in Chinese).
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