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A Case Study for Wastewater Treatment: Hirwaun



A collaborative trial, with five water utilities, was created to validate of effectiveness of Hydro's electro-chemical (EC) system for solids-metal separation within the utility sector. 

Hydro was able to demonstrate the capabilities of the system with trial results confirming the ability to treat the backwash water to the standard required. This is the standard for the new discharge consent limits for disposal at the Wastewater Treatment Works (WWTW). This water can also be returned to the head of the works to be reused, resulting in improved process and cost efficiency.


New consent limits were created as a requirement for companies to increase the standard of wastewater treatment. The main pollutant of concern was iron, with consent levels demanding a maximum concentration of


A HydroCurrent system and a dissolved-air floatation tank for solids-liquids separation were deployed to site. Treating 10,000 litres/hour, the unit not only successfully met the parameters but exceeded them. In addition, the Hydro unit significantly reduced the solids, turbidity and colour levels. The longevity of the trial has been noted with the discharge water consistently meeting the limits.
The economic benefit is substantial with the WTW having the ability to recycle the treated water and use it to clean the backwash filters. The risk of site closure can be removed and any negative environmental impact mitigated.