原水生物预处理软体动物的大量生长与控制

Biological Pre -Treatment of Raw Water to Control the Growth of Mollusca

椎实螺是原水生物预处理填料上易大量生长的一种软体动物。试验研究表明 :当其个体数量少而且体小时 ,对原水生物预处理的影响较小 ;当其大量生长且个体在 5～ 10mm大小时 ,对原水生物预处理的危害较大。采用静置、水力冲洗法清除池内的椎实螺简单、易行 ,可作为工程的控制措施。淡水壳菜在填料的中轴附近大量生长会减少填料的总表面积 。

Galba pervia is a mollusca generally appearing and growing on surface of package media of raw water pre treatment facility. The experiment result showed that, Galba pervia has little influence on raw water bio treatment process when it growing sparsely and being in juvenile; however, Galba pervia can threat bio film and cause decline of pollutant removal when it growing in large number and becoming mature with size of 5～10 mm. In this experiment we find that stewing and hydro sweeping might be a feasible and simple method to remove Galba pervia and this method might be a engineering measure. Limnoperna lacustris can grow largely in the center of YDT elastic packing media to reduce the total surface areas of media; this can be prevented by pre filtration process.