短程硝化曝气生物滤池效果分析与运行参数优化
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摘要
为改善短程硝化曝气生物滤池(BAF)的运行效果,通过单因素试验确定了最佳温度、pH值和溶解氧(DO)浓度,并在此基础上采用响应面分析法中Box-Behnken中心组合设计进行了运行参数优化试验与回归模型分析。试验结果表明,短程硝化BAF最佳运行条件如下:温度为30℃、pH值为8. 5、DO为2. 0 mg/L;基于响应面分析法优化短程硝化BAF运行参数得到的最优模型如下:温度为28. 3℃、p H值为8. 1、DO为2. 15 mg/L,在此条件下对氨氮的去除率达到92. 15%,亚硝酸盐氮积累率为92. 65%。响应面试验回归模型的分析结果显示,该模型具有较高的显著性(P <0. 000 1),pH值和DO对氨氮去除率的影响显著,且交互作用明显;温度、pH值和DO对亚硝酸盐氮积累率的影响显著,且pH值和DO、温度和pH值交互作用明显。
Single factor experiments were used to determine the optimum temperature,pH value and dissolved oxygen (DO) of a shortcut nitrification biological aerated filter (BAF) to improve its operational performance. On this basis,the Box-Behnken central combination design in response surface methodology was used to carry out the operational parameter optimization test and regression model analysis. The results showed that the optimum operational conditions of the BAF were as follows:temperature of 30 ℃, pH value of 8. 5 and DO of 2. 0 mg/L. Based on the response surface methodology,the obtained optimal operational parameters were as follows: temperature of 28. 3 ℃,pH value of 8. 1 and DO of 2. 15 mg/L. Under this condition,the ammonia nitrogen removal rate reached 92. 15%,and nitrite nitrogen accumulation rate was 92. 65%. Regression model analysis of response surface experiments indicated that the model had high significance (P < 0. 000 1). pH value and DO had significant influence on ammonia nitrogen removal rate,and the interaction was obvious. In addition,pH value,DO and temperature affected the nitrite nitrogen accumulation rate significantly, and the interaction between pH value and DO,temperature and pH value was obvious.
Single factor experiments were used to determine the optimum temperature,pH value and dissolved oxygen (DO) of a shortcut nitrification biological aerated filter (BAF) to improve its operational performance. On this basis,the Box-Behnken central combination design in response surface methodology was used to carry out the operational parameter optimization test and regression model analysis. The results showed that the optimum operational conditions of the BAF were as follows:temperature of 30 ℃, pH value of 8. 5 and DO of 2. 0 mg/L. Based on the response surface methodology,the obtained optimal operational parameters were as follows: temperature of 28. 3 ℃,pH value of 8. 1 and DO of 2. 15 mg/L. Under this condition,the ammonia nitrogen removal rate reached 92. 15%,and nitrite nitrogen accumulation rate was 92. 65%. Regression model analysis of response surface experiments indicated that the model had high significance (P < 0. 000 1). pH value and DO had significant influence on ammonia nitrogen removal rate,and the interaction was obvious. In addition,pH value,DO and temperature affected the nitrite nitrogen accumulation rate significantly, and the interaction between pH value and DO,temperature and pH value was obvious.
引文
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[11]Ma B,Wang S Y,Cao S B,et al.Biological nitrogen removal from sewage via anammox:Recent advances[J].Bioresour Technol,2016,200:981-990.
[2]彭赵旭,彭永臻,左金龙.全程硝化与短程硝化的特性对比研究[J].中国给水排水,2008,24(23):6-10,15.Peng Zhaoxu,Peng Yongzhen,Zuo Jinlong.Comparison of characteristics of complete nitrification and shortcut nitrification[J].China Water&Wastewater,2008,24(23):6-10,15(in Chinese).
[3]李占,李冬,陶晓晓,等.序批式生物膜反应器常温亚硝化启动试验研究[J].现代化工,2010,30(10):69-73.Li Zhan,Li Dong,Tao Xiaoxiao,et al.Start-up experiment of shortcut nitrification in sequencing batch biofilm reactor under room temperature[J].Modern Chemical Industry,2010,30(10):69-73(in Chinese).
[4]焦阳,李军,朱向东,等.BAF深度处理二沉池出水的抗冲击能力研究[J].中国给水排水,2010,26(3):103-105.Jiao Yang,Li Jun,Zhu Xiangdong,et al.Impact resistance of BAF for advanced treatment of secondary effluent[J].China Water&Wastewater,2010,26(3):103-105(in Chinese).
[5]张磊,刘平,马锦,等.基于微气泡曝气的生物膜反应器处理废水研究[J].环境科学,2013,34(6):2277-2282.Zhang Lei,Liu Ping,Ma Jin,et al.Wastewater treatment using a microbubble aerated biofilm reactor[J].Environmental Science,2013,34(6):2277-2282(in Chinese).
[6]徐影,仇天雷,韩梅琳,等.PCR-DGGE技术解析固体碳源表面生物膜的微生物群落结构[J].环境科学,2013,34(8):3257-3263.Xu Ying,Qiu Tianlei,Han Meilin,et al.Analysis on microbial community in biofilm coating onto solid carbon source using the PCR-DGGE technique[J].Environmental Science,2013,34(8):3257-3263(in Chinese).
[7]梅瑜,成卓韦,王家德,等.新型生物滴滤填料性能评价[J].环境科学,2013,34(12):4661-4668.Mei Yu,Cheng Zhuowei,Wang Jiade,et al.Performance evaluation of three novel biotrickling packings[J].Environmental Science,2013,34(12):4661-4668(in Chinese).
[8]Brockmann D,Morgenroth E.Evaluating operating conditions for outcompeting nitrite oxidizers and maintaining partial nitrification in biofilm systems using biofilm modeling and Monte Carlo filtering[J].Water Res,2010,44(6):1995-2009.
[9]Biswas R,Bagchi S,Bihariya P,et al.Stability and microbial community structure of a partial nitrifying fixed-film bioreactor in long run[J].Bioresour Technol,2011,102(3):2487-2494.
[10]Park S,Bae W,Rittmann B E.Operational boundaries for nitrite accumulation in nitrification based on minimum/maximum substrate concentrations that include effects of oxygen limitation,p H,and free ammonia and free nitrous acid inhibition[J].Environ Sci Technol,2010,44(1):335-342.
[11]Ma B,Wang S Y,Cao S B,et al.Biological nitrogen removal from sewage via anammox:Recent advances[J].Bioresour Technol,2016,200:981-990.
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