Features of a double-chamber bed and case study Original Research Article

A double-chamber bed (DCB) was developed in China in 1980 and has been used for more than 500 sets. This paper introduces the structural and operational features of DCB and concludes that their unique structure leads to perfect operational features; thus, it is the best option for reconstruction projects and can replace other types of ion-exchangers such as mixed-beds, double-cell fluidized beds, multi-beds, etc. Then, four reconstruction project cases were introduced that were selected from more than 20 plants designed by us. From the case study it can be concluded that DCBs can be used not only to treat different source waters (river and well) but can also be used to treat water with a ratio of transient hardness to total cations to be less than 0.5 with the ratio of strong to weak anions to be more than 7.0. These findings enlarge the application scope of DCBs.