Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/685686
16 WET NEWS JUNE 2016 It was action stations at Transvac when a water company urgently needed one of its containerised carbon dosing systems. The challenge: Overcoming the unexpected INSIGHT Water Treatment A TransPAC being loaded on to a lorry ready for transporting W ater treatment works are regularly faced with problems with contamination to the raw water supplies that feed into their works' inlet. Chemicals like pesticides, put onto fields by farmers to treat crops, oen get washed into ground water by heavy rainfall. This finds its way to lakes, rivers and reservoirs, which are the main source of our drinking water. The Drinking Water Inspectorate (DWI) monitor and inspect water companies to ensure levels of contaminates are within allowable limits and when these limits are breached they issue notices to a water company to take action. Some pesticides can be notoriously difficult to remove from water, requiring high levels of processing and additional treatments, which uses extra energy and valuable resources. One of the most efficient ways of removing pesticides from water is by addition of Powder Activated THE CONCEPT • The system doses the exact amount required to remove the pesticide • TransPAC is housed within a shipping container, enabling it to be lifted from one site to another • The system includes a bulk bag handling frame, carbon transfer equipment, booster pump, header tank, control panel and Ejector skid NEED TO KNOW 1 TransPAC units can take up to 12 weeks to manufacture from scratch 2 PAC adsorbs the chemicals out of the water safely and is removed at flocculation stage 3 This project did not require any ground or construction works THE VERDICT "Transvac's quick reaction was the key to the success of this project, with priority given to get the system into the WTW where it was needed in more urgently. Due to the TransPAC being so adaptable it was great that we were able to respond to such an urgent issue so quickly." David Moss, Transvac Senior Commissioning Engineer Carbon (PAC) into treatment works. PAC adsorbs the chemicals out of the water safely and is removed at flocculation stage as a part of the process sludge. Resources As PAC is a difficult substance to handle, Transvac's design team developed its system to transfer the carbon with the minimum human intervention and wastage. A custom bulk-bag handling split frame has been designed to be removable from the container via a fork li truck for easy and safe bag loading. In an industry where efficient use of resources is key, the sealed transfer system and accurate dosing ensures that no carbon is wasted. The system also has the added flexibility to accept a carbon feed from a Silo, which the site operator can do within a few minutes. One of the largest regulated water companies in the UK recently placed an order with Transvac to purchase one of its fully-containerised carbon dosing systems, the TransPAC. The system was to be delivered to one of the utility's water treatment works to tackle taste and odour issues by dosing the exact required amount of PAC into the water. However, just a few weeks away from delivery, the same water company experienced more critical taste and odour issues at a different water treatment works – 60 miles away from the original site. TransPAC units can take up to 12 weeks to manufacture from scratch, and with sales at an all-time high, there were no ready-made units to purchase. A HMI control panel runs the system with the only input being the flow rate of carbon