The sludge from the manufacture and recycling of paper (de-inking sludge) is generated in large quantities throughout North America. Currently, common landfilling and land application management practices are under increasing environmental scrutiny and are becoming increasingly costly.
The paper fiber can be recovered as fuel or recycled as fiber. Kaolin clay can be recycled in the papermaking process or other industrial applications. The removal of clay also significantly increases the value of the fuel and reduces the ash created during combustion.
This type of processing plant has been designed as a turnkey solution using KDS Micronex ™ to recycle sludge from the pulp and paper industry.
The extensive tests conducted in the United Kingdom shows that the sludge can be dried from 38% to 16% moisture with a total energy consumption of only 90 kW and a water removal rate of 236 kg / hour.
Therefore, the KDS has a cost advantage of 25% over conventional dryers, assuming that the relative prices of electricity and natural gas remain the same. It should be emphasized that the clay and fiber components of the deinking sludge CAN NOT be separated from the dried deinking mud in a drum dryer.
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In contrast, our plants produce a fluffy and fibrous product that allows the clay to separate from the residual fiber that can then be burned in boilers as fuel.
The clay can be calcined and reused in the papermaking process. Similarly, extensive testing in Ontario, Canada with a local deinking sludge showed that the sludge can be dried at similar feed rates and power consumption from an initial water content of 50% to a final water content 15%, that is, 370 kg /hour with a total energy consumption of 100 kW. This represents an even better economy than in the U.K tests, that is, a cost advantage of 33% over a dryer powered by natural gas.
Our customers choose this type of plants because: