SPECIAL WORKS
D Wise benefits from Hydrex 6861 waste treatment chemical solution
VeoliaWater Technologies UK (VWT UK) has been specified to supply its water treatment chemical solution, Hydrex 6861, to egg product supplier DWise, based inMalpas, Cheshire. This has allowed the company to reduce the amount of sludge by-product formed during itsmanufacturing processes – and the costs to remove it fromsite. It has also improved its water treatment efficiency, resulting in an estimated and significant £50k of annual savings.
DWise is a family run business that specialises in the production of pasteurised egg products for the food industry. As a result, its wastewater is contaminated by substances including egg proteins and cleaning chemicals. Previously, a combination of PAC (PolyaluminiumChloride) and sodium hydroxide was used to coagulate the wastewater prior to being passed through a DAF (Dissolved Air Flotation) unit.
However, this solution was producing a high volume of sludge, causing the DAF unit to become overloaded with suspended solids. Consequently, it was only able to treat a limited amount of wastewater per day, while the remaining 70m3 had to be removed fromsite by a local farmer, for land spreading. Removing this quantity would require five to six trips to site every day at a cost of £65 per load. Over the course of a year, this amounted to well over £100k in removal costs to DWise.
An alternative solution was required. JamesWise, [OperationsManager] at D Wise commented: “I started looking for a new water treatment supplier and Veolia Water Technologies UK seemed to have a
50 | June 2023 |
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good number of really strong reviews that assuredme the company offered a reliable service. I also liked the look of VWT’s Hydrex 6861 organic coagulant that would enable us to cut out chlorine fromour water treatment process.”
Hydrex 6861 is a coagulant derived completely fromrenewable sources and is an effective replacement for traditional inorganic solutions, such as ferric sulphate. Easy to use, Hydrex 6861 does not require caustic soda for pH correction. Crucially, it also offers cost savings as it can reduce sludge production by approximately 30%in comparison withmetal salts coagulants, thereby reducing sludge disposal and dewatering costs.
After being contacted by James, Brian Jones, Business DevelopmentManager for VWT UK visited the DWise site. Together they discussed the use of Hydrex 6861 and replacing the use of PAC and sodiumhydroxide in the system without adding to the level of sludge
formation. This would enable the DAF unit to double its processing capacity so that it treats 4m3 per hour for ten hours a day – saving DWise £50 k per year. As a result, VWT UK was awarded the contract to supply effluent treatment chemicals for the next 12months.
“So far, everything is going really well,” commented James. “Brian has been able to pass on his expertise, training our teamto use the chemicals effectively and maximise the performance of the DAF unit. If we ever have a problem, we know we can contact Brian, and he will respond quickly.
“We have recently been planning to move DWise to a larger site that will producemore effluent. Originally, we believed we would need to upgrade our wastewater treatment systemas a result. However, now that we’re using Hydrex, it is likely we will be able to keep the same system. I’mexcited to see the long-term results and would definitely recommend VeoliaWater Technologies UK to others.”
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