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− | + | <font size=3>'''Post-Storage Treatment Process Considerations'''</font size><br> | |
− | + | Link to this [[Post-Storage Treatment Process Considerations|table]] | |
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− | + | [[category:Rain harvest table]] | |
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Post-Storage Treatment Process Considerations
Link to this table
Post-Storage Treatment Process | Description and Considerations | Treatment Alternatives | Target Pollutants | Capital Cost | O&M Level | Energy Needs | Advantages over Alternatives | Disadvantages over Alternatives |
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Dissolved Solids Removal | Filtration generally is used to remove residual solids that will not settle spontaneously from harvested water through sedimentation or which may become re-suspended in storage. Filters come in a variety of different types and sizes. The type of filter depends on the class of pollutants targeted for removal. | Coarse & fine filters |
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Med | Med | Med |
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Micro-filtration |
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Med | Med | Med |
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Nano-filtration |
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Med | Med | High |
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Reverse-osmosis |
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High | High | High |
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X | X |
Ion-exchange filter |
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High | High | High |
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Disinfection | Disinfection processes kill, remove, or deactivate pathogenic microorganisms in harvested water. | Chlorination – injects chlorine into stormwater |
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Low | Low | Low |
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Ultra-violet light (UV) radiation – stormwater is passed over an ultraviolet lamp |
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Med | High | High |
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Ozonation – diffused ozone released through a fine bubble diffuser at the bottom of the storage tank (possible with stormwater but rarely used) | Med | Med | Med |
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Other treatments (e.g., pH adjustment) | Treatment for pH adjustment may be needed if the end use of harvested water requires a neutral pH or if harvested water will come in contact with metal pipes or surfaces. Rainwater tends to be slightly acidic and harvested stormwater may retain this characteristic. Acidity can cause metal pipes to corrode leading to contamination of harvested water. | Chemical additive |
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Low | Low | Low |
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