工作压力对污泥淤砂分离器分离效能的影响

Effect of Working Pressure on Separation Performance of Grit Separation Module

工作压力直接影响污泥淤砂分离器的分离效果,是污泥淤砂分离器最重要的控制参数,试验结果表明,随着工作压力的增加,分离器处理能力呈显著的线性增长（判定系数R2=0.9889）,分流比呈显著的指数衰减（R2 =0.9931）;分离效率、富集率呈先增加后稳定的趋势,运用Boltzmann函数模型进行拟合,其R2分别为0.9757和0.9878.工作压力为0.150～0.200MPa时可以获得较高的分离效能,且当工作压力为0.175MPa时污泥淤砂分离器的分离效能最高.锥角20°、溢流口直径22 mm、底流口直径13 mm的污泥淤砂分离器在工作压力为0.175 MPa的情况下分离效率为48％,其分流比为0.17.如果将底流污泥作为外排污泥,则可以增加淤砂的排放,有助于缓解污水厂的淤砂问题.

Working pressure P which directly influenced separation performance of grit separation module was the most important control parameter. Experimental results show that with the increasing of the working pressure, the processing capacity increases significantly linearly （R2 = 0. 988 9） and the split ratio exponentialy （R2 = 0. 993 1 ）. Separation efficiency and enrichment ratio increase first and then remain stable. Boltzmann function model was emploged to fit the trend, the R2 being 0. 975 7 and 0. 987 8, respectively. Better separation performance can be obtained when the work pressure controls between 0. 15 - 0. 2 MPa, and the best separation performance can be obtained when the working pressure is 0. 175 MPa. The separation efficiency r/of the gritseparation module is 48% and the split rate g isφ 17 under the condition that the cone angle is 20, the overflow hole diameter φ22 mm, underflow port diameter φ 13 mm and the working pressure is O. 175 MPa. If we drain the underflow sludge, which can increase grit discharge, thus the grit problem can be relieved.