The 3800.237 0.158 0.21 0.237 0.158 1Horizontal Flow Tanks

The designs were evaluated using the knowledge and basics of Project Management course. At first, we learned about our project objective in depth. After research it was evident that filtration must be followed by coagulation followed by aeration and lastly by pH controller (as can be seen in figure 1). After a brainstorming session of each process the relevant thoughts were screened out to form a definite design concept. These ideas were further evaluated upon different factors using weighting rating matrix and risk assessment charts.Weighting Rating MatrixMax/Best 5 4 3 2 1 Min/WorstFor DesignCriterion Cost Practicality Maintenance Time Duration User Friendly Power Consumption Volume of Water Structural Strength Total90 70 60 50 70 70 60 50 5200.173 0.135 0.115 0.096 0.135 0.135 0.115 0.096 1Vertical Design 4 4 3 3 3 4 4 3 3.558/5Horizontal Design 2 4 4 2 2 2 3 4 2.807/5For FiltrationCriterion Cost Durability Maintenance Time Duration Removal of Particles Power Consumption Enrichment of Water Total90 80 60 50 70 70 60 4800.188 0.166 0.125 0.104 0.146 0.146 0.125 1Latticed Screen 3 4 4 4 2 4 1 3.145/5Cartridge Filter 2 4 3 4 4 2 1 2.832/5Carbon Filter 3 2 3 4 3 4 1 2.834/5Multi-Media Filter 4 4 3 3 4 4 4 3.771/5For CoagulationCriterion Cost Hazard Risk Time Duration Complexity Power Consumption Total90 80 60 50 60 70 4100.22 0.195 0.146 0.122 0.146 0.171 1Electrophoresis 2 4 4 3 3 3 3.121/5Mixing of two Opposite Charge 4 5 3 3 4 4 3.927/5Boiling 4 1 4 4 3 3 3.098/5Coagulation of lyophilic Solution 3 5 2 3 3 4 3.415/5For SedimentationCriterion Cost Design Percentage of Sedimentation Time Duration Complexity Total90 60 80 90 60 3800.237 0.158 0.21 0.237 0.158 1Horizontal Flow Tanks 4 4 4 2 4 3.526/5Radial Flow Tanks 3 3 3 3 3 3/5Inclined Flow Tanks 4 4 4 4 3 3.842/5Ballasted Flow Tanks 3 3 4 3 3 3.21/5For AerationCriterion Time Duration Surface Area Operating Cost Maintenance Elements reduced Total90 70 80 70 90 4000.225 0.175 0.2 0.175 0.225 1With Perforated Plates 4 4 4 3 4 3.825Without Perforated Plates 3 2 3 4 3 2.825With Perforated Plates (Finehole diffusers) 4 5 1 1 4 3.05Air stripping 3 5 2 2 1 2.525For ArsenicCriterion Time Duration Hazard Operating Cost Maintenance Power Consumption Complexity Practicality Total80 70 80 60 70 60 70 4900.1637 0.143 0.163 0.122 0.143 0.122 0.143 1Electrolysis 4 4 4 4 4 4 4 4/5Discarded Cigarette Ashes 3 3 3 3 4 3 3 3.143/5For pH ProcessCriterion Time Duration Risk Hazard Operating Cost Maintenance Power Consumption Complexity Practicality Total80 70 70 80 60 70 60 70 5600.143 0.125 0.125 0.143 0.107 0.125 0.107 0.125 1With Controller 4 4 4 3 4 3 3 4 3.625/5Without Controller 3 2 2 4 3 4 4 3 3.125/