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Effect of the start-up length on the biological nutrient removal process

机译：启动时间对生物营养去除过程的影响

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In this work, a study of the start-up stage of a Biological Phosphorus Removal (BPR) process was carried out. To do this, SBR alternating anaerobic and aerobic conditions were used with conventional activated sludge and fed with synthetic influent at the beginning of each cycle. During the length of the cycles (4 h) the most important parameters were determined. The main results obtained were that during the first days of the start-up stage the phosphorus removal percentage increased more quickly that those of the COD and ammonium-nitrogen. However, it was necessary to extend the start-up stage to at least 30 days in order to obtain the maximum phosphorus removal percentages and a stable Phosphorus Accumulating Organisms (PAO) population, whereas the maximum COD and ammonium-nitrogen removal percentages were obtained in about ten days. Once the start-up period had finished the ratio P released to COD stored was determined, obtaining a value of about 0.14, which is significantly lower than the theoretical value (0.55), suggesting the presence of a significant GAO population.
机译：在这项工作中，对生物除磷（BPR）过程的启动阶段进行了研究。为此，将SBR厌氧和好氧条件与常规活性污泥交替使用，并在每个循环开始时加入合成进水。在整个周期（4小时）内，确定了最重要的参数。获得的主要结果是，在启动阶段的第一天，除磷百分比的增加速度快于COD和铵氮的去除率。但是，有必要将启动阶段延长至至少30天，以便获得最大的除磷百分比和稳定的磷累积生物（PAO）种群，而获得最大的COD和铵态氮去除百分比。大约十天。一旦启动阶段结束，就确定释放的P与储存的COD的比率，得出的值约为0.14，这大大低于理论值（0.55），表明存在大量的GAO。

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