Centrifugal extraction machine adopts liquid-liquid extraction treatment of papermaking wastewater
Mainly from paper industry wastewater treatment in pulp and papermaking industry in the production of pulp and writing two production process.
Pulping is to separate the fiber in plant material, make pulp, then through bleaching;
Writing is the dilution, forming, pressing, drying and made into paper.
Both process discharge a large amount of waste water.
pulping wastewater, the pollution is most serious.
When washing pulp effluent is dark brown, called blackwater blackwater high concentrations of pollutants in the BOD as high as 5 -
40 g/L, contains a lot of fiber, inorganic salt and pigment.
Bleaching process waste water discharge also contains large amounts of acid and alkali substances.
Dipping paper mill waste water discharge, known as white water, which contains a lot of fiber and added in the production process of packing and rubber.
disposal of wastewater from papermaking industry should concentrate on improving circulation water use ratio, reduce water consumption and wastewater emissions, at the same time should also actively explore a variety of reliable, economic, and can make full use of useful resources in wastewater treatment.
Such as flotation process fibrous solid material in the recycled water, recovery rate can reach 95%, clear water reuse;
Combustion method of recycling the blackwater in sodium hydroxide, sodium sulfide, sodium sulfate and other sodium salt with organic matter.
Neutralization adjusting wastewater pH;
Coagulation sedimentation or flotation process can remove suspended solids in the waste water;
Chemical precipitation to decolorization;
Biological treatment can remove BOD of kraft paper wastewater treatment is effective;
Wet oxidation method sulfite pulp wastewater treatment is more successful.
In addition, both at home and abroad are using reverse osmosis, ultrafiltration, such as electrodialysis treatment method.
extraction using. cwl -
M type centrifugal extraction machine liquid liquid extraction method in the treatment of papermaking wastewater phenolics, can deal with phenolics, and reduce the use of the extraction agent, reducing environmental pollution.
M type centrifugal extraction machine by solvent extraction principle some of which were extracted from liquid mixture operation known as liquid/liquid extraction � � � centrifugal extraction machine extraction is the use of various components in the solution you choose, the differences in the solubility of solvent, the solute of liquid-liquid mass transfer, in order to achieve the operation of the separation of homogeneous liquid mixture.
Raw material liquid mixed with the extracting agent fully contact, complete the solute mass transfer process;
weight according to certain proportion respectively from two two phase solution and feeding tube into the drum shell ring gap formed between the mixed zone, with the aid of the rotation of the drum, through the turbine disc and the impeller to make two phase mixing and dispersing quickly, two phase solution fully mass transfer.
Complete mixing and mass transfer process.
Extraction and extraction residual phase separation process;
mixture under the action of vortex disk into the rotary drum, in the plate to form the bulkhead area, mixture quickly with synchronous rotary drum, in under the action of centrifugal force, the heavier than major phase fluid in the process of upward mobility and gradually away from the drum center on the drum wall;
Small proportion of liquid phase gradually away from the drum wall and on to the center, after clarification of two phase fluid end respectively through their weir plate into the collection chamber and the tube was closed to derivation, respectively, to complete two phase separation process.
From the extraction phase and extraction phase extractant recycling process.
usually use the method of distillation recycling extracting agent.
Removal after extraction of proportion as the extractant extract;
After removal from the extraction agent over extraction of proportion of extraction liquid.