Page 119 - Hong Kong Green School Guide

3. Green School Guide - 3.4 Water Use
Hong Kong Green Building Council 117
c. Solutions
• Rainwater can be harvested from roof with drainage pipe directed to treatment
plant and storage tank;
• Grey water can be harvested from basin and shower with drainage pipe
directed to treatment plant and storage tank;
• Rainwater and grey water harvested can be used for irrigation and floor
cleaning purposes;
• Grey water treatment plants are generally more complicated than rainwater
treatment systems, as they necessitate stricter filtration and disinfection
requirement;
• However, for new and existing schools considering water treatment systems,
the following aspects should be consulted with Authorised Person (AP) and
Registered Professional Engineer (RPE) in Building Services Discipline:
- - Space / plant room required for water treatment system;
- - Drainage system;
- - Alterations and additional works to the existing building structure (in order
to support the water system treatment) if required will need approval from
Buildings Department;
- - Obtaining approval from Water Supplies Department; and
- - Treated water quality and hygiene, etc.
d. Professional Help
• Authorised Person (AP) – Appendix A (2)
• Registered Professional Engineer (RPE) in Building Services Discipline –
Appendix A (4)
• Approved Supplier (Water Treatment Category) – Appendix B (1)
Cost Information
The costs for installation and maintenance vary depending upon:
• Integration with the current piping system for existing building;
• Region of manufacturer;
• Maintenance cost;
• Space for water treatment system; and
• Maintenance/installation access.
Schools can contact contractors provided in Appendix B (1) for costs and
options.