Greywater Reuse for Irrigation Purposes

  • MarinaAndj
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Greywater Reuse for Irrigation Purposes

Dear all,

In our ​project area, ​we are ​generating 35 ​MLD greywater ​daily. ​

What is the ​best technology ​available to ​treat greywater ​and reuse for ​irrigation ​purposes? ​

I would like ​to know the ​feasibility of ​these ​technologies, ​as well as ​economical ​details.
Please share ​your case experiences and ​treatment ​details. ​

Thank you!

Originally posted on The Water Network: bit.ly/2drx7IW
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  • canaday
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Re: Greywater Reuse for Irrigation Purposes

Dear Marina,

This is an important issue, but we need to know more about the situation. What country is it? What is the climate? What crops are being grown?

At first glance, it seems the greywater could first pass through an Anaerobic Baffled Reactor (ABR) to separate solids, grease, and maybe even biogas. Next, if food crops that are eaten raw are to be irrigated, I would put the greywater through some sort of Vegetated Sand Filter (= Constructed Wetland, Phytoremediation) to control the pathogens and produce fodder for animals and potentially other useful products.

Please post more information on the case in question.

Best wishes,
Chris Canaday

Conservation Biologist and EcoSan Promoter
Omaere Ethnobotanical Park
Puyo, Pastaza, Ecuador, South America
inodoroseco.blogspot.com
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  • clint
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Re: Greywater Reuse for Irrigation Purposes

Hole Mi Amigo,

Having worked with aerobic treatment of greywater for over 45 years I would recommend that you utilize at least a three chambered septic type tank or three separate tanks connected in series.

With minimal energy the first two chambers and/or tanks are aerated to immediately provide oxygen to the "Good" Guys, the aerobic ones!

By installing plumbing T's, in our case 2", at each interior effluent port, the fats and grease that floats remains in the tank to be eaten up by the "Good" Guys, and the heavy stuff settles to the bottom for easy removal with a bottom discharge for maintenance, in our tanks, or pipe installed to suck those settleable solids out to be further composted in a separate composting system for total resource recovery.

Google AlasCan and Equaris Corporation and you will find drawings of our greywater patented technologies if you wish to utilize a system that has proven its performance under Arctic and Caribbean conditions.

If you really want to get into it, think about ozone and reverse osmosis and total reuse of the greywater to drinking water qualities and then utilize the RO concentrate to irrigate and/or flush water consuming toilets.

El Hombre de La Lluvia

A basic septic tank works or even on a residential level three plastic 30 gallon or larger tanks connected in series.
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