Abstract

The effect of temperature on phosphorous, nitrogen, organic matter removal, overall effluent quality, methane, and hydrogen production in an activated sludge system (ASS) is assessed in this research. For the plant-wide model of the ASS, benchmark simulation model (BSM2-P) with an ASS (ASM2d) is used and the temperature is selected between 10 to 35°C covering different seasons. A steady-state simulation is carried out to evaluate the effluent compositions by changing kinetic parameters. A total of fourteen kinetic expressions for the maximum growth rate of heterotrophic biomass, autotrophic, phosphate accumulating organisms and their decay rates, oxygen saturation, hydrolysis, fermentation and oxygen mass transfer coefficients are also considered. Improved removal efficiency of NH, TN, TP, COD, and BOD₅ is obtained at 17, 20, 10, 20, and 28°C temperatures respectively. The average percentage of removal is obtained as 22.2, 9.7, 28, 1.7, and 86.4% respectively for NH, TN, TP, COD, and BOD5 which is higher when compared to the removal rate at 15°C. Further, the anaerobic digestion model (ADM1) is also used with changing physico-chemical parameters which are functions of temperature. The corresponding physico-chemical parameters are analysed in the range of 25 to 55°C. A total of seven physico-chemical kinetic expressions for the acid-base equilibrium gases are considered which includes Henry’s law coefficient for carbon dioxide, methane, hydrogen, and partial pressure of water. At higher temperature (55°C) the ADM1 showed improved production efficiency rates for carbon dioxide and hydrogen but at lower level (25°C) it showed lower production efficiency rates. The average production rates of methane, hydrogen, and CO₂ at 55°C different by –0.01, 54.1, and 7.8% respectively when compared at temperature of 28°C. This knowledge of varying temperature leads to the operator to handle biological treatment for wastewater in a quality manner with an optimal operational cost.

中文翻译：

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一种基于模型的方法来研究工厂范围内的生物废水处理厂的温度影响

摘要

本研究评估了温度对活性污泥系统 (ASS) 中磷、氮、有机物去除、整体出水质量、甲烷和氢气产生的影响。对于 ASS 的全厂模型，使用带有 ASS (ASM2d) 的基准模拟模型 (BSM2-P)，温度选择在 10 到 35°C 之间，覆盖不同的季节。进行稳态模拟以通过改变动力学参数来评估流出物成分。还考虑了异养生物量、自养生物、聚磷生物的最大生长速率及其衰减速率、氧饱和度、水解、发酵和氧传质系数的14个动力学表达式。提高 NH、TN、TP、COD 和 BOD _{5的去除效率}分别在 17、20、10、20 和 28°C 温度下获得。NH、TN、TP、COD 和 BOD5 的平均去除百分比分别为 22.2、9.7、28、1.7 和 86.4%，与 15°C 的去除率相比更高。此外，厌氧消化模型（ADM1）也用于改变物理化学参数，这些参数是温度的函数。在 25 至 55°C 的范围内分析相应的物理化学参数。共考虑了酸碱平衡气体的七个物理化学动力学表达式，包括二氧化碳、甲烷、氢气和水分压的亨利定律系数。在较高温度 (55°C) 下，ADM1 显示出更高的二氧化碳和氢气生产效率，但在较低温度 (25°C) 下，它显示出较低的生产效率。甲烷、氢气和一氧化碳的平均产率₂在 55°C 时与 28°C 的温度相比分别相差 –0.01、54.1 和 7.8%。这种对不同温度的了解使操作员能够以最佳的运营成本以高质量的方式处理废水的生物处理。