Changes

When rainwater is drained from the roof surface into the basement, it is collected by a rainwater cistern (CVC’s old, passive system). Water from this cistern can be pumped through the SBR’s second CSA-compliant treatment system. The following are the main treatment components of this basement system:

When rainwater is drained from the roof surface into the basement, it is collected by a rainwater cistern (CVC’s old, passive system). Water from this cistern can be pumped through the SBR’s second CSA-compliant treatment system. The following are the main treatment components of this basement system:

'''Settling Tanks:''' Allow any sediment that is suspended in the rainwater drained from the roof to settle out before rainwater enters the cistern. Three (3) settling tanks are present.

*'''Settling Tanks:''' Allow any sediment that is suspended in the rainwater drained from the roof to settle out before rainwater enters the cistern. Three (3) settling tanks are present.

Rainwater Cistern: Has capacity for up to 5,000 L of rainwater. This cistern holds water that will then be pumped through the CSA-compliant treatment system. After treatment, rainwater is used in Building A’s toilets.

Rainwater Cistern: Has capacity for up to 5,000 L of rainwater. This cistern holds water that will then be pumped through the CSA-compliant treatment system. After treatment, rainwater is used in Building A’s toilets.

 

*'''Micron Filter:''' Removes any fine debris from the rainwater that was not settled out in the settling tanks. This filtration is important for removing impurities, eliminating odours, and ensuring debris does not impeded the efficacy of the UV treatment unit by blocking light. A filter pore size of 5 μm is used.

'''Micron Filter:''' Removes any fine debris from the rainwater that was not settled out in the settling tanks. This filtration is important for removing impurities, eliminating odours, and ensuring debris does not impeded the efficacy of the UV treatment unit by blocking light. A filter pore size of 5 μm is used.

*'''UV Lamp:''' Disinfects rainwater by sterilizing bacteria and viruses with UV radiation. Note that UV disinfection does not have any residual effect that can be harmful to humans or aquatic life. A dosage of 40 mJ/cm2 is administered.

 

*'''Chlorine Pump:''' Provides a chlorine residual of 0.5 mg/L that can ensure that rainwater is protected from recontamination in the distribution line or when supplied to the toilets. Chlorination is not required for CSA compliance, but it was added for good measure.

'''UV Lamp:''' Disinfects rainwater by sterilizing bacteria and viruses with UV radiation. Note that UV disinfection does not have any residual effect that can be harmful to humans or aquatic life. A dosage of 40 mJ/cm2 is administered.

*'''Agitator:''' Mixes the newly introduced chlorine solution into the treated rainwater. This ensures that water is sufficiently mixed prior to being added to the greywater line.

 

'''Chlorine Pump:''' Provides a chlorine residual of 0.5 mg/L that can ensure that rainwater is protected from recontamination in the distribution line or when supplied to the toilets. Chlorination is not required for CSA compliance, but it was added for good measure.

 

'''Agitator:''' Mixes the newly introduced chlorine solution into the treated rainwater. This ensures that water is sufficiently mixed prior to being added to the greywater line.

Once treatment is complete, the rainwater is added to Building A’s greywater line for use in the building’s toilets. Currently, rainwater is only planned for use in toilets, but greywater use could be expanded to irrigation applications at a later phase. Although CVC would have no need for it, there is potential for rainwater to be reused for industrial uses, like vehicle washing and industrial processes. Upgrading the treatment systems could also make rainwater reusable as potable water.

Once treatment is complete, the rainwater is added to Building A’s greywater line for use in the building’s toilets. Currently, rainwater is only planned for use in toilets, but greywater use could be expanded to irrigation applications at a later phase. Although CVC would have no need for it, there is potential for rainwater to be reused for industrial uses, like vehicle washing and industrial processes. Upgrading the treatment systems could also make rainwater reusable as potable water.