The Hadwaco system for treatment of industrial and municipal waste water, leachate from landfills and for preparing drinking and process water has in a relatively short time become an attractive alternative to conventional evaporation solutions.  Based on mechanical vapour recompression (MVR) and the falling film principle, the system is reported to have several benefits when compared with competing technologies. The advantages include, for example, good purification results, lower energy consumption and lower investments costs. 

The Finnish company Hadwaco Ltd has delivered its first evaporator for purifying rinse water to a plant for the treatment of aluminium profile surfaces. The purification process is based on a closed-loop system whereby purified rinse water is re-utilised, and chrome is efficiently separated and brought to a deposit. The capacity of the plant, at Mäkelä Alu Ltd in central Finland, is 50 m3 of rinse water per day.

In industrial pulp and paper processes, the consumption of fresh water can be reduced by employing counter current water flow arrangements and efficient water separation between the various process stages. The effluent from the processes will then be highly concentrated, but by utilising new evaporation technology, significant cost savings can be achieved. Two evaporation methods, mechanical vapour recompression (MVR) and multi-stage evaporation (ME), are applied to the evaporation process. The operational costs for multi-stage evaporation are low, since low-grade surplus heat from pulping and stock preparation can be used as an energy source. The system is marketed by Hadwaco Ltd Oy of Finland and Andritz AG, who recently signed a co-operation agreement.