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Treatment of farm dairy effluent with hybrid upflow multilayer bioreactor and activated sludge module

机译:混合上流多层生物反应器和活性污泥模块处理农用乳制品废水

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Biological removal of nitrogen and carbon from farm dairy effluent (FDE) was studied with two laboratory-scale systems following nitrification and denitrification processes. Each system consisted of an upflow multilayer bioreactor (UMBR) as a pre-denitrification unit, an aeration tank (AT) as nitrification unit and a secondary clarifier. The optimization of two operational variables, total hydraulic retention time (HRT) and internal recycle (IR) rate with both real-FDE and a synthetic-wastewater were investigated. First, HRTs of 2, 3, 4 and 5 days were tested with synthetic-wastewater at uniform IR rate. The HRT of 4 days proved optimum with high efficiencies for nitrification (>90%), denitrification (>90%) and total chemical oxygen demand (COD) removal (similar to 90%). The lowest efficiency was recorded at 2 days HRT with 7% nitrification efficiency. This was followed by experimentation with IR rates of 200%, 300% and 400% on both real-FDE and synthetic-wastewater at optimized HRT. The increase in IR to 300% improved the denitrification potential and overall performance with continuous high nitrification efficiency and COD removal whereas IR of 400% retarded the process. The application of combined UMBR and activated sludge system showed good potential for biological removal of nitrogen from FDE.
机译:在硝化和反硝化过程之后,使用两个实验室规模的系统研究了从农场乳制品废水(FDE)中生物去除氮和碳的方法。每个系统均由上流多层生物反应器(UMBR)作为预脱氮装置,曝气池(AT)作为硝化装置和二级澄清池组成。研究了使用实际FDE和合成废水对两个运行变量(总水力停留时间(HRT)和内部循环率(IR))进行的优化。首先,用合成废水以均匀的IR率测试2天,3天,4天和5天的HRT。事实证明4天的HRT具有最佳的硝化(> 90%),反硝化(> 90%)和总化学需氧量(COD)去除效率(约90%)。在HRT 2天记录的最低效率为7%的硝化效率。随后,在优化的HRT上对真实FDE和合成废水的IR率分别进行200%,300%和400%的实验。 IR不断提高至300%,通过持续高的硝化效率和COD去除提高了反硝化潜力和总体性能,而IR达到400%则阻碍了该过程。结合使用UMBR和活性污泥系统显示出从FDE中生物脱氮的良好潜力。

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