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The technology for treating the industrial wastewater produced in the paper-making industry is able to separate aqueous paint as well as starch adhesives from the polluted industrial wastewater coming from the industrial process. The treatment principle consists in chemical stabilization, precipitation, and sedimentation, with subsequent filtration and dewatering in a filter press. For the separation of polluted wastewater, technology can be used for water containing adhesives and paint separately or together.
The wastewater that is continuously released from the production plant is homogenized in an accumulation plant, where it is stirred with a slow-speed stirrer and pumped via a pipe mixer to a coagulation-sedimentation reactor. After homogenization, the wastewater always has approximately the same pollution quality.
In the pipe mixer, wastewater is adjusted with an alkaline stabilizer to the required pH value. Pollution is separated from wastewater through precipitation by the dosing of coagulant. In this way, the neutralization of wastewater to the required pH value is ensured, to comply with the requirements for water released into the sewerage system.
A more effective filtration capability and the dewatering of precipitated products in the filter press is achieved by the addition of organic flocculant. The treated wastewater complies with the requirements for the biological after-treatment of wastewater in a biological wastewater treatment plant.
1 Precipitation reactor
8 Mechanical pre-treatment
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