The contract for the process improvements and plant upgrade of an existing effluent treatment plant at the Waters? Edge site at Barton-upon-Humber in North Lincolnshire, to facilitate environmental clean up, was awarded to Naston by North Lincolnshire Council in March 2000. The value of the contract was ?0.4million and was based on design/build and operation strategy. A Naston operator will run the plant as opposed to handing over the plant complete to the client. Naston is now successfully treating effluent from the site.
Formerly, an agri-chemicals manufacturing operation occupied the site which is undergoing an extensive remediation process mainly involving the excavation of contaminated land. The excavation work generates effluent, which is transferred to a central 15000 m? capacity treatment lagoon; from which it is extracted for treatment by the new plant before discharge into the River Humber. Any discharge from the treatment plant is in accordance with stringent consent parameters stipulated by the Environment Agency.
Process Improvements and Plant Upgrade The process improvements and plant upgrade were specified using in house design capability to achieve optimum flexibility of plant operation. The varied nature of the polluted land excavated generates differing qualities of effluent dewatered from an area, as stages of the site remediation process progress.
Naston worked in close liaison with North Lincolnshire Council to tailor the treatment system to suit each stage of remediation activity.
Effluent Treatment Process 1. Air Stripping Tower for the removal of ammonia.
2. Ferric Sulphate dosing for flocculation to facilitate the removal of metals.
3. Granular Activated Carbon (GAC) filters for organic chemicals present in the effluent.
4. Caustic Soda and/or Acid dosing for pH control and correction.
5. Final effluent monitoring. Logging final pH and volumetric discharge into the River Humber.
6. Continuous monitoring and recording of Total Organic Carbon (TOC) loading the plant.
Ammonia Stripping Tower Bespoke air-stripping tower, capable of removal of 90% ammonia present in liquid effluent and operating in conjunction with the on-site pH control facilities.
Filter Package Sand/Anthracite filter followed by duty/standby Granular Activated Carbon Filters for the removal of organic compounds in the effluent.
pH Control and Correction pH control for ammonia removal. The air-stripping tower requires input pH of 11 to 12, necessitating the dosing of large volumes of caustic soda solution.
pH correction for acidic effluent using low volume dosing of caustic soda solution.
pH correction for alkaline effluent using low volume dosing of sulphuric acid solution.
Waters? Edge Effluent Treatment Plant
