中试MBBR装置强化氨氮去除速率的影响条件研究

采用中试MBBR组合工艺处理深圳市布吉河道的城镇污水,进水平均氨氮浓度为(25.88±7.73)mg/L,出水平均为(1.11±1.93)mg/L.单因素小试研究表明,反应器中挂有生物膜的悬浮填料具有强化氨氮去除的效果,投加该填料时获得的比氨氧化速率比采用活性污泥进行反应提高了25.5%;试验条件下通过投加甲醇将COD从139mg/L提高至587mg/L,比氨氧化速率从2.55mg/(gMLVSS·h)下降至1.91mg/(gMLVSS·h);当MLVSS浓度从0.45g/L逐步提高到4.05g/L时,容积氨氧化速率从3.68mg/(L·h)线性增加至7.82mg/(L?h),拟合度R2为0.967,但比氨氧化速率随MLVSS浓度的提高反而逐渐下降,从8.24mg/(gMLVSS·h)降至1.93mg/(gMLVSS·h);当温度从5℃升高到35℃,比氨氧化速率从0.99mg/(gMLVSS·h)提高至2.89mg/(gMLVSS·h),采用Arrhenius经验方程描述时,拟合度R2为0.970;当DO浓度从0.5mg/L逐步增加至4.0mg/L时,比氨氧化速率从0.62mg/(gMLVSS·h)提高至2.28mg/(gMLVSS·h),Monod方程可以很好的描述DO浓度与比氨氧化速率之间的关系,拟合度R2为0.994,氨氧化半饱和常数值为3.0mg O2/L.

Enhanced ammonia removal rate in a pilot-scale MBBR

A combined pilot-scale MBBR process was used for treatment of the wastewater in the Buji River in Shenzhen city. The averaged influent and effluent ammonia nitrogen concentrations were (25.88±7.73) mg/L and (1.11±1.93)mg/L, respectively. The results of the single factor experiments show that the biofilm fillers enhanced the ammonia removal and increased the specific ammonia oxidation rate by 25.5% to activated sludge. The specific rate decreased from 2.55mg/(gMLVSS·h) to 1.91mg/(gMLVSS·h) with the COD increasing from 139mg/L to 587mg/L, decreased from 8.24mg/(gMLVSS·h) to 1.93mg/(gMLVSS·h) with the MLVSS increasing from 0.45g/L to 4.05g/L, increased from 0.99mg/(gMLVSS·h) to 2.89mg/(gMLVSS·h) with the temperature increasing from 5℃ to 35℃ and increased from 0.62mg/(gMLVSS·h) to 2.28mg/(gMLVSS·h) with the DO concentration increasing from 0.5mg/L to 4.0mg/L, respectively. However, the volume ammonia oxidation rate increased linearly from 3.68mg/(L·h) to 7.82mg/(L·h) with the increased MLVSS (R2 = 0.967). The Arrhenius experience equation was used to describe the influence of temperature (R2 = 0.970). The Monod equation fitted the process well (R2 = 0.994) and the estimated half saturation constant of ammonia oxidation was 3.0mg O2/L.