Wednesday, October 24, 2012

Green project part 3: Integrated rainwater harvesting and grey water recycling systems

You may click on these links for part 1 and 2 of this green project.

After months of planning, sourcing, talking to vendors etc., the prototype for the rainwater harvesting (RWH) and grey water recycling (GWR) systems is up. This prototype combines both systems into a single framework (pun intended) and is intended for testing the components and process flow as a coherent whole. Though the final design in the "actual" project will appear very different, this prototype and the actual system basically share the same elements and process flow.

Our SP Library has kindly allowed the prototype to be placed in their garden for testing. Bravo to them!

Figure 1: Figure shows the mini grey water recycling system incorporating  plants as the "filters" in 3 separate cells. In the background, you can see the book shelves of the library. If this prototype proves successful, it may be placed as it is for the long term as an educational tool for our students. Posters will then be fixed strategically to explain the capabilities of the system and how it works.
Figure 2: To polish up the grey water and the rainwater, off-the-shelf filters are installed. Depending on the quality of your input and the desired quality of your output (what do you want to use your treated water for?), these filters may not be necessary.


Jedi_Uno said...


Do you know of any company that designs and installs RWH system? This is for a landed residential unit. Thanks.

CK said...

As far as I know, there is no company in Singapore specialising in RWH. The alternative is to do lots of research and come up with your own design (including dimensions, materials, process flow and control) and get a general contractor to work on it.

chi said...


I'm rebuilding my home at the moment and wish to have a large rainwater harvesting tank beneath the house. The water will be used for watering plants and washing floor. Would you know what sort of maintenance that is needed, or who I'm able to talk to regarding such a harvesting tank? My architect mentioned that they need to be cleaned periodically and we're still at a discussion stage on the rainwater harvesting tank. Thanks.

CK said...

Chi, you may want to check out my recent blog post: More power to rainwater harvesting in Singapore! for further details.

If you check out the code of practice for water services, it states that a water tank has to be cleaned at least once a year.

Unknown said...

I am able to design and install the system with my team. Let me know of your requirements.

Unknown said...

Generally, the maintenance includes tank cleaning, pipe flushing and filter maintenance / replacement.