A lab-scale Hybrid Upflow Anaerobic Sludge Blanket (HUASB) reactor with a working volume of 6.5 litres has been taken for the performance analysis, in the treatability study of pulp and paper mill wastewater. In order to analyze the performance of the reactor, operational parameter like hydraulic retention time (HRT) was varied from 10, 20, 30 and 40 h. In addition to that, performance parameters like chemical oxygen demand (COD), pH, volatile fatty acids (VFA), alkalinity, gas production and VFA/alkalinity ratio are analyzed to check the reactor efficacy. The maximum COD removal efficiency of 81.3% is obtained at 40 h HRT, with gas production (methane content of 58%). Also, the obtained results are fitted to the kinetic models like the standard first order, first order and second order to evaluate the performance of the HUASB reactor.

中文翻译：

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用于制浆造纸厂废水处理的HUASB反应器中非逐步性能评估的数学方法

在纸浆和造纸厂废水的可处理性研究中，采用了实验室规模的混合上流式厌氧污泥毯（HUASB）反应器，其工作容积为6.5升，用于性能分析。为了分析反应器的性能，将诸如水力停留时间（HRT）之类的运行参数从10、20、30和40小时变化。除此之外，还分析了性能参数，如化学需氧量（COD），pH，挥发性脂肪酸（VFA），碱度，产气量和VFA /碱度比，以检查反应器的效率。在40 h HRT时，最大COD去除效率为81.3％，同时产生天然气（甲烷含量为58％）。同样，将获得的结果拟合到动力学模型（如​​标准的一阶，一阶和二阶），以评估HUASB反应器的性能。