July / August 2016 |
FIBCs & Bagging |
BULKDISTRIBUTOR |
17 |
A mobile solution for tainted water
Mobile discharging of powdered activated carbon from bulk bags helps solve pesticide overload fast at a water treatment works
When a British water treatment works 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 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 6m-long shipping container , that was delivered and activated within a single day , without the need for costly and time-consuming site preparation , construction or complex components . Supplied by Transvac Systems Ltd , the TransPAC mobile powder handling and carbon dosing system includes a bulk bag discharger and two flexible screw conveyors from Flexicon ( Europe ) Ltd 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 wastage .
Handling problems
Powdered activated carbon adsorbs the pesticide on its surface , and the carbon and adsorbed material are subsequently removed as sludge in the flocculation process . However , the extremely fine powder , with an average particle size of only 20 microns and a bulk density of 230kg / cbm , is prone to dusting .
Both the bulk bag discharger and flexible screw conveyors prevent dusting . The bag outlet spout is connected to the feeder by a Spout-Lock clamp ring , which creates a secure , dust-tight connection between the clean side of the bag spout and clean side of the bag spout interface .
The 5m long flexible screw conveyor ( left ) from the bulk bag discharger moves the carbon powder to the surge hopper from which the second 3.5m long flexible screw conveyor moves the powder to the intake of the Transvac ejector ( right )
Extra fine powdered activated carbon is prone to dusting but is contained by the flexible screw conveyors and dust-tight connection at the discharger ’ s bag spout interface
TransPAC mobile powder handling and carbon dosing system houses a split-frame bulk bag discharger , two flexible screw conveyors , a control panel and the Transvac ejector
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 . The split-frame discharger fits inside the container . A forklift loads the 1.8m-high bag-loading frame and 500kg bulk bag onto the 0.9m-high stationary discharger frame inside the container . Once the bag spout is untied , the powder flows into a 5m-long , 80mm diameter flexible screw conveyor leading to the 930-litre capacity surge hopper . A second 3.5m-long , 67mm diameter flexible screw conveyor moves the carbon powder from the hopper outlet to the intake of the ejector that accurately doses the PAC into the municipal water stream . The conveyors are curved to fit the tight space within the container . From the control panel , the operator sets the speeds of the conveyor drives to dose the proper amount of PAC automatically according to the site water flow . Low and high level sensors in the surge hopper signal the controller to start or stop flow through the first flexible screw conveyor when the hopper contents reach low or high level . The carbon dosing portion of the TransPAC system includes a header tank for incoming water , a booster pump and the ejector . The velocity of the water flowing through a venturi creates a low pressure zone in the ejector that entrains the carbon powder into the treated water stream at a rate set at the control panel . The unit operates with no moving parts .
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
Each flexible screw conveyor consists of a stainless steel screw rotating inside a durable polymer tube that contains the fine powder as it is conveyed . The conveyor discharge is likewise dust-free , as powder exits through a transition adapter located forward of the drive at the discharge end , thereby preventing powder from making contact with bearings or seals . 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 . www . transvac . co . uk www . flexicon . co . uk
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