| Title |
Design of Residual Treatment Process with Filter Backwash Recycle System |
| Authors |
배병욱 ( Byung Uk Bae ) ; 최경환 ( Kyung Hwan Choi ) |
| Keywords |
Backwashed residual sedimentation basin; SRSB; Design of residual treatment train; Filter backwash water recycle; Solid Loading rate; Surface Loading rate |
| Abstract |
In this study, both sedimentation and thickening experiments were conducted for residuals produced from an advanced water treatment plant for more accurate and practical design of residual treatment train. In order to design a backwashed residual sedimentation basin (SRSB) in the filter backwash water recycle system, two kinds of backwash waters, one from sand filter (SFBW) and the other from GAC adsorption bed (GACBW), were separately collected and their surface loading rate measured. In addition, in order to design a gravity thickener, batch thickening tests were conducted for concentrated residuals taken from sedimentation basin and their limiting solid flux (SFL) measured. From the experimental results and consideration of the seasonal characteristics of the residual, surface loading rate of 70 m3/m2·d was proposed as a design parameter for SRSB and solid loading rate of 20 kg TS/m2·d was proposed as a design parameter for gravity thickeners. Finally, the material mass-balance was made for the design of each unit process in the residual treatment train. |