Deep bed filtration is an important unit operation in water treatment technique 摘要深層過濾是水處理工藝中的重要單元操作。
Meanwhile , the filtration capacity of the deep bed using the uniform media is analyzed and valuated 同時,對均質濾料的過濾性能進行了分析、評價。
Filtration is one of important operation units in water treatment operation process , and the sand granule used in the deep bed filtration is the key to perform a satisfied capacity 過濾是給水處理中?個重要的單元操作過程,其中濾料是濾池的核心,它的選擇直接影響濾池的過濾特性。
( 3 ) the water head loss of the standard deep bed and that of the designed deep bed have less difference if the later is built according to the relationship of l / d2 , but they have larger difference when it is constructed according to the relationship of l / d 按照l d ~ 2的關系設計新濾池時,標準濾池的水頭損失與新濾池的水頭損失之間的差別較小,而按照l d的關系設計新濾池時,標準濾池的水頭損失與新濾池的水頭損失之間的差別較大。
Theoretical analysis shows that the filtration behaviors of the deep bed , that are the head loss and turbidity of the effluence water , have the correlation o f l / d2 with the deep bed when the diameter of the filtration media is changed , if the depth of the deep bed is designed according to the relationship of l / d2 , the filtration behavior of the deep bed will have a closer similarity with that of the original one 理論分析表明,濾池的過濾特性,即濾池的水頭損失和出水濁度與濾池的l d ~ 2成正比。改變?yōu)V料粒徑后,按照l d ~ 2的關系來確定濾池深度,與原濾池的過濾特性將保持更為良好的相似性。
Through choosing different diameter of sand granule , using fecl3 and pac as the coagulants , doing paralleled test through standard filtration column compared with referenced filtration columns ( the coarser and the finer sand granule used as filtration media separately ) , the thesis investigates the correlation between the filtration behavior and the depth of the deep bed l , the diameter of the sand granule d 本文采用不同粒徑的石英砂濾料,以fecl _ 3 、 pac作為混凝劑,通過進行標準濾池與參照濾池(分別裝填細濾料、粗濾料)的平行對比試驗,研究濾料粒徑改變后,濾池過濾特性與濾池深度l 、濾料粒徑d的相關關系。
In designing the deep bed , the empirical formula l / de = 800 is used as the basis . however , it has been proved that the formula cannot precisely describe the functional relationship and the correlation degree between the nitration behavior of the deep bed filtration process , the depth of the deep bed and the diameter of the sand granule , and it is restricted greatly in the practical application of finding a suitable depth of the deep bed 目前,濾池的設計通常采用經(jīng)驗公式i d _ e = 800作為設計濾池厚度的依據(jù),但實踐證明此經(jīng)驗公式還不能準確地反應濾池過濾特性與濾池深度l 、濾料粒徑d的相關關系及相關程度,在實際應用中受到很大限制。