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首页> 外文期刊>Clean technologies and environmental policy >Systematic analysis of the operational response of activated sludge process to variable wastewater flows. A case study
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Systematic analysis of the operational response of activated sludge process to variable wastewater flows. A case study

机译：系统分析活性污泥工艺对可变废水流量的操作响应。案例研究

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Flow perturbation due to inflow of water (mainly rain water) and loss of wastewater from the pipes of a sewage network is a widely recognized phenomenon in the operation of sewage transfer systems. The most apparent result is the variability of wastewater flow in the input of the subsequent wastewater treatment facilities, which affects several operational parameters including the sedimentation processes and the biological activity. As part of an overall effort for the upgrade of the wastewater treatment plant of Ioannina (Greece) a 3-year study was undertaken to investigate the effect of wastewater flow fluctuation on the performance of the treatment process. In either case (water infiltration or wastewater evaporation) a decrease in the process performance was observed due to decrease in the hydraulic or solids retention time or due to the elevated feed concentration caused by the reduced flow, respectively. Handling these problems through control of the return activated sludge flow was not found to be totally adequate for all operating conditions, thus indicating the need for a different perspective in the design procedures in order to meet with the legislative mandated effluent limits.
机译：在污水输送系统的运行中，由于水（主要是雨水）的流入和污水从污水管网的管道流失而引起的流量扰动是公认的现象。最明显的结果是随后的废水处理设施输入中废水流量的可变性，这会影响几个操作参数，包括沉降过程和生物活性。作为升级约阿尼纳（希腊）废水处理厂的整体努力的一部分，进行了为期3年的研究，以调查废水流量波动对处理过程性能的影响。在任何一种情况下（水渗透或废水蒸发），由于水力或固体保留时间的减少或流量减少导致的进料浓度升高，均导致过程性能下降。通过控制返回的活性污泥流量来处理这些问题并不完全适合所有操作条件，因此表明需要在设计程序中采用不同的观点，以符合法律规定的废水限值。

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