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Use "vacuum evaporation" as water treatment technology in a surface treatment plant to get zero waste water discharge.

The technique ensures total treatment of all waste water
streams under the concentration limits, recycling of rinsing
water and electricity production. Investigation into the
technical, ecological and economic benefits of the technique

For the countries of Europe, the new PARCOM limits require many industries to achieve optimised waste water management. The lowering of concentration limits for several pollutants requires a change in waste water treatment technology. In the Belgian company STC N.V. the waste water treatment installation has to be rearranged. The new technology has to fulfil several requirements, namely: * be able to clean different waste streams at the same time * the treated water must be dischargeable at any time in such a way that none of the concentration limits is exceeded. * avoid transport and external treatment of some concentrated waste waters. * be technically, economically and ecologically feasible. This can be achieved with "vacuum evaporation". The energy for the evaporation will be generated in a so-called co-generator, where natural gas is transformed into electricity and a defined volume of hot water. This hot water is used to bring the waste water up to a reduced boiling point (30 deg.C). The excess electricity can be sold or used within the company. The implementation of a "vacuum evaporation" technique, is the final goal of this project. The evaporation technique has several advantages in comparison with conventional environmental technologies: no waste water discharge, rinse water recycling, production of electricity, strongly reduced solid waste disposal (drying of sludge), chemical- free technique, environmental legislation is no longer a problem because there are no concentration limits to consider, the technology complies with the PARCOM requirements (reducing and avoiding waste, recovery of valuable products) and is suitable for the treatment of all kinds of waste water. The evaporation technique is not new. What is new, however, is the forward-looking application which makes it possible to produce energy and recycle rinsing water. On the other hand, the technology can purify all waste water streams in such a unique way that "zero waste water discharge" is obtained. Keywords: environment, waste water discharge, vacuum evaporation.
Acronym: 
ZEWADI
Project ID: 
2 171
Start date: 
01-10-1999
Project Duration: 
60months
Project costs: 
1 000 000.00€
Technological Area: 
Water Pollution / Treatment
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.