Objective
The project intends to demonstrate and document a new clean technique for washing with reduced or eliminated discharges to waste water recipients. Regeneration and purification of the used wash solution are integrated with the wash process. Ten demonstration plants in food industry, printing works and vehicle washes will be erected during 1997 - 1999.
The new cleaning method in regeneration and purification of the used wash solution are integrated with the wash process. The integration means, inter alia, that the main part of the regeneration agent, which consists of sodium orthophosphate, is recycled in the system. Sodium orthophosphate is a very efficient water softener, corrosion inhibitor and pH-stabiliser. The sodium orthophosphate stabilises pH in a range where the precipitation of heavy metals is quantitative. The recycling makes it possible to maintain very high concentrations of cleaning agents in the wash solution. The wash result becomes therefore very good, i.e. better or even much better than without recycling. The orthophosphate protects the washed metal surfaces against corrosion and delays corrosion after the wash by forming a very thin layer of insoluble phosphate. The technique has a very wide applicability and can, with small modifications, be used for almost every cleaning process using alkaline water. The savings of water and chemicals are large and will normally offset the costs of the process.
Topic(s)
Data not availableCall for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
175 40 Järfälla
Sweden