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Hey,

Everyone insists on “not storing greywater”. Is this the case even if the greywater is treated?

I live in Lebanon where there are 6 months of rain and 6 months of drought. During the dry season, I don’t have the need to store water, instead, i’ll irrigate the trees with it on the same day. However, during the rainy season, the greywater will be of no use if not stored 🙁 I’ll show you what I’m thinking of and i would appreciate it if you can tell if this can work out or not.
I’ll treat the greywater through several phases:
Note that our home produces around 700-800 liters of greywater per day.
cloth filter –> grease trap –> filtration through wetlands (big enough in order for the water to be well treated and for enough period of time) –> vermicomposting area (for the worms to consume what’s left of the organic contents) –> biosand filtration –> storage tank or small pond (aerated with a pump)
october’s greywater will be stored the whole wet season, till the beginning of april (I know that’s too much and i kind of anticipate the answer…)
Is this treatment sufficient to store greywater for ~6 months? are there any modifications needed?
If this won’t work, are there any other treatment methods that allow me to store greywater for this long?
Thanks in advance 🙂
Greywater reuse- general greywater   greywater filtering   wetlands   greywater storage
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Hi Khalil,

You bring up an important point. In the US there are many regions with a similar rainy/dry season. What typically works best is to store rainwater from the rainy season to offset irrigation need during the dry seasons, and use the greywater during the dry season as well.

The system you describe may work, or you may have odor issues, clogging issues, and maintenance challenges. It is much easier to store rainwater than greywater. The quality of rainwater is very good, so you don’t need to treat the water. All you need are simple screens to keep out leaves and debris. Also, if you have a roof, it is very easy to collect a lot of the rainwater.

I hope this makes sense!

Best wishes with your system.

-Laura

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Yeah i guess you’re right Laura, it seems that storing greywater is a hassle especially for that long… I got into this cause i was trying to minimize the area of rainwater harvesting (i’m not harvesting just from the roof). but at the end, the difference is no that huge. so no greywater storage. thx again 🙂

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