When a water treatment works in northern England faced a spike in pesticide concentration exceeding the allowable concentration limit for the incoming water, the site was forced to shut down. The company then had to divert water from a regional water treatment works in order to provide clean drinking water to its customers until the problem could be solved.
The solution arrived in the form of a mobile, lorry-mounted carbon dosing system, housed in a 6 m long steel shipping container that was delivered and activated within one day, without costly and time-consuming site preparation, construction or complex components.
Bulk bag and lifting frame of the BFF-C-X Bulk Out™ split-frame bulk bag discharger are forklifted onto the stationary discharger frame inside the container.
Supplied by Transvac Systems, the TransPAC mobile powder handling and carbon dosing system includes a bulk bag discharger and two flexible screw conveyors from Flexicon Europe, and Transvac’s ejector system for mixing and injecting a slurry of PAC (powdered activated carbon) into the municipal water stream.
The mobile unit requires only connections to an electric power supply, the municipal water stream, and an external water supply. Environmental impact and site preparation are minimised, as well as the need for maintenance and planning permission. The system is safe to operate, and simple to control.
The water treatment works was restored to compliance as the dosed carbon successfully removed pesticide traces from the main water stream. Dosing is accurate and steady without over-dosing or wastage.
From the BFF-C-X Bulk-Out™ split-frame bulk bag discharger, PAC is automatically transferred from a half tonne bulk bag through a flexible screw conveyor to a surge hopper from which a second flexible screw conveyor meters the powder into the Transvac ejector.
Transvac has deployed its mobile TransPAC dosing systems in a number of UK water treatment works for similar emergencies for pesticide, or taste or odour problems and as an alternative to traditional PAC batch dosing systems, which are large, complex and costly, and require long lead times by comparison.
