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The technology for the treatment of wastewater from laundries makes it possible to separate dirt, residual pollution by mechanical particles, bleaching agents, and tensides from the polluted industrial wastewater. The treatment principle consists in chemical stabilization, precipitation, and sedimentation or flotation, with subsequent filtration and dewatering in a filter press.
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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