A laboratory study has been conducted to assess the performance of Hybrid Upflow Anaerobic Sludge Blanket (HUASB) Reactor in treating paper mill effluent. The hydraulic retention time (HRT) is maintained at 12 h. The organic loading rates (OLR) are calculated on the basis of COD inlet in the reactor for different flow rates and the maximum OLR is found to be 12 kg COD/m³.d. The maximum reduction of TCOD and SCOD is found to be 92 and 88% respectively. The maximum biogas production is 4.85m³/m³.d. The hybrid up flow anaerobic sludge blanket reactor is found to be develop granules in two different inoculum sludges in early granulation and start-up has been studied. The study reveals that earlier start-up and granulation of biomass can be achieved using mixed sludge (cow dung and effective microorganisms (EM)). Scanning electron microscope (SEM) study of the granules shows predominance of Methanosarcina and Methanothrix type of species on the surface of granules. The process efficiency and biogas production is found to be increased with an increase in the organic loading rate. Methanobacterium and Methanosaeta bacteria were dominant at the end of start-up whereas Methanosarcina, cocci and rods are predominant at the end of performance studies. The size of the granules is 1 to 3 mm and exhibite good settleability. Residence time distribution (RTD) study show mixed regime flow behaviour at the end of performance study. Dispersion numbers greater than 0.2 show the reactor attained ideal mixed flow regime.

中文翻译：

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实验室规模混合上流厌氧污泥床反应器的流体力学行为

已经进行了一项实验室研究，以评估混合上流厌氧污泥毯子（HUASB）反应器在处理造纸厂废水中的性能。水力停留时间（HRT）保持在12小时。根据不同流速下反应器中的COD进口量计算有机负荷率（OLR），发现最大OLR为12 kg COD / m ³ .d。发现TCOD和SCOD的最大减少分别为92％和88％。最大沼气产量为4.85m ³ / m ³.d。混合上流厌氧污泥毯式反应器在早期制粒中被发现是在两种不同的接种污泥中形成颗粒，并已进行了启动研究。研究表明，使用混合污泥（牛粪和有效微生物（EM））可以实现生物质的早期启动和造粒。颗粒的扫描电子显微镜（SEM）研究表明，颗粒表面上主要有甲烷菌和甲烷菌属物种。发现随着有机负载率的增加，过程效率和沼气产量增加。在启动结束时，甲烷菌和甲烷菌属细菌占主导地位，而在性能研究结束时，甲烷菌，球菌和杆状菌占主导地位。颗粒的大小为1至3mm，并表现出良好的沉降性。停留时间分布（RTD）研究显示，性能研究结束时混合态流行为。分散数大于0.2表明反应器达到了理想的混合流态。