Physical Separation
This section evaluates the physical separation alternatives for the treatment train. This section is broken down into physical screening and fine screening. The process is essential as it removes large debris from
the influent water such as garbage, branches, and other material that can harm
equipment in the AWPF.
Physical Screening Alternatives
The physical screening alternatives that were evaluated were the FlexRake FPFS Thru-Bar Cleaning Fine Screen and the Duperon Self-Cleansing Trash Rack. These alternatives are shown in the figures below.
Figure 2: Trash Rack (Duperon Self-Cleansing Trashrack)
Figure 1: Bar Screen (FlexRake FPFS Thru-Bar Cleaning Fine Screen)
Fine Screening Alternatives
Fine screening alternatives that were evaluated were the HUBER Fine Screen STEP SCREEN SSV and Johnson Vee-Wire Flat Panel Wedge Wire Screens. These alternatives are shown in the figure below.
Figure 3: Step Screen (HUBER Fine Screen STEP SCREEN SSV)
Figure 4: Wedge Wire Screens (Johnson Vee-Wire Flat Panel Wedge Wire Screens)
Physical Separation Scoring Criteria
Each alternative for physical separation was given a score from one to three. One being the least suitable alternative and three being the most suitable from the given criteria. The following table provides how each criteria was scored with the reasoning. It also provides the reasoning for the weighting of each criterion.
Table 1: Physical Separation Scoring and Weighting Table
Physical Screening Decision Matrix
Using the scoring criteria for physical separation, the decision matrix for physical screening was created to find the most suitable alternative for the treatment train. The decision matrix below is a simplified decision matrix, you can find the complete matrix in the final report, Appendix G: Scoring, Weighting, and Decision Matrix for Physical Screening.
Table 2: Physical Screening Simplified Decision Matrix
Fine Screening Decision Matrix
Using the scoring criteria for physical separation, the decision matrix for fine screening was created to find the most suitable alternative for the treatment train. The decision matrix below is a simplified decision matrix, you can find the complete matrix in the final report, Appendix K: Scoring, Weighting, and Decision Matrix for Fine Screening.
Table 3: Fine Screening Simplified Decision Matrix
