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污水土地处理系统流态影响因素及优化

Keywords: 土地处理系统,水力流态,正交分析,停留时间分布

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Abstract:

在污水土地处理系统的反应器模型中进行流态实验,使用正交分析理论及停留时间分布(RTD)分析理论,探索管网、集水层和承托层对反应器体积效率及推流的影响,并对反应器构造进行优化。使用正交实验分析发现,各因素对体积效率的影响程度顺序为:承托层>集水层>管网,管网与承托层的影响有明显的交互作用;集水层对推流有影响,并且管网与集水层有很显著的交互作用。使用RTD分析各因素交互作用发现,采用全网布水与集水时,集水层及承托层对流态的影响都不大。管网布设为过水断面的一半(半网)时,集水层的集水作用及承托层的布水作用可以增加反应器体积效率。“半网-有集水层-有承托层”的体积效率最高,流态最接近推流形式,其无因次平均停留时间为1.093,轴向扩散系数为0.037,属于低扩散程度。

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