间歇运行提高二沉池负荷能力

Improving Hydraulic Surface Loading of Secondary Sedimentation Tank by Intermittent Sedimentation Process

通过对竖流式和平流式沉淀池进行间歇运行和连续运行模拟试验,探讨出水前静态沉淀对表面负荷的影响。试验结果表明在相同的进出水水质条件下,交替式内循环活性污泥系统间歇沉淀运行方式下的表面负荷最大值可比连续沉淀的表面负荷值高出约4倍,为同类工艺设计过程中选取较大的表面负荷提供了理论依据。这项研究结果的应用将大幅缩减工程投资。

To study the effect of the static settlement on the overflow rate, the simulating experiment was conducted on the traditional sediment tanks including the vertical-flow tank and the horizontal-flow tank which was run respectively under continuous settlement and intermittent settlement. Given the same quality of the influent and getting the same quality of the effluent, the result shows that the value of the overflow rate in the intermittent settlement process of the alternated internal-cyclic system（AICS） can be about 4 times higher than that in the continuous settlement process. This result will provide theoretical reference for choosing a higher value of the overflow rate in the designs of similar processes of AICS with a theoretical basis. And the application of this result will significantly reduce the investment of the project.