Grey-water treatment



Greywater treatment involves taking wastewater from showers and wash hand basins, treating it, and re-using it in certain applications.



2nd class water


Much of the water used by an enterprise does not need to be 1st class potable (drinking) water. Do you really need potable water to flush toilets with, irrigate plants, use in scrubbers, chillers, or wash vehicles with? Greywater can meet the water required in several applications, mainly toilets and irrigation.  


It is worth examining your enterprises operations to identify the quantity of water being consumed in these applications. Once you know the demand for 2nd class water, you can identify whether it can be met by greywater recycling.


How can you recycle greywater?


Firstly wastewater from showers and wash hand basins needs to be collected separately to that from toilets. This wastewater then normally is passed through filters to remove suspended mater, some systems also include bacterial filtration. The water is normally then chlorinated at which point it can be re-used.


Several technologies are available on the Maltese market. The project calculates that a minimum water consumption of 25m3 daily is required to make such an investment financially feasible. The minimum space required is around 25m2 – the size of a small yard.


Costs involved in recycling greywater


Recycled greywater is a very cheap source of water, estimated at €0.40 per m3. Costs for equipment start at around €60,000 with a repayment period of around 3 year.


Online Self-Assessment Tool – is rainwater harvesting for you?


Our online self-assessment tool can evaluate the potential for greywater harvesting in your premises. The tool assumes that you will use greywater only for the flushing of toilets; however a more in-depth study could reveal other uses of greywater. If you would like an indication of other uses book a water audit here.



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