Effluent treatment

The mills based on Oxygen Delignification process could be considered the most environmental friendly between the existing ones based on the advanced technologies.
This becomes evident considering that:

• no chlorine or chlorine derivatives and no sulphur are involved in the process
• the bleaching technology, ozone and peroxide based, will allow the closest water recycling system.

The mills based on our process using annual plants, wastepaper or wood, which will have a too low capacity to justify the investment in the recovery system, could take the advantage of using the anaerobic-aerobic technology for their effluent treatment.
It has been shown by the pilot and industrial installation that the biological treatment can be easily operated with a very limited amount of sludges.
The COD load can be reduced by 70% in the anaerobic treatment with a very limited sludged production. The 350-400 N.m³ of biogas per ton of COD destroyed, helps in reducing the operating costs to an acceptable level. In most of the cases the COD load can be reduced up to 85%, by adding an aerobic treatment.
It has to be also evidenced that our process could help in garbage disposal.
In many regions, e.g. in the US, the problem of solid waste, relevant part of which is paper, becomes quite critical.
Recycling of secondary fibers into the papermaking process implies the reconditioning of the material and bringing it as far as possible back to its original virgin conditions.
When a paper web is dried, the free water between the fibers and in the lumen evaporates first. The effect of drying is not completely reversible.
Through the application of a proper recycling process involving a chemical treatment, the original fibers' characteristics can be restored. The  process may be considered as a fiber re-vitalization process.
The use of wastepaper in food packaging (food board, liquid packaging board and tissue paper) has been prevented by the occurrence of bacteria and poisonous chemicals.