Renovation example of magnetic coagulation sedimentation pretreatment project for raw water of printing and dyeing wastewater
The original design of a printing and dyeing enterprise wastewater treatment station in Shunde.Guangdong province used a common inclined tube sedimentation tank as a pre-treatment measure for printing and dyeing wastewater.Due to the large amount of sludge,the sedimentation tank had a serious sludge running phenomenon,weak impact load resistance,and low land use effi-ciency.In order to improve the pre-treatment effluent effect and to make space for future deep treatment renovation projects,the factory designed a magnetic coagulation process to replace the original inclined tube sedimentation for coagulation and sedimentation pre-treatment of the inlet water.The operation results of the renovation project showed that,while saving 50％of land,the effluent effect of the renovated sewage magnetic coagulation pretreatment system was stable,with a COD removal rate stable at 40％-50％,and the effluent quality better than before the renovation.After magnetic coagulation,the physical and chemical sludge concentration is high.After condi-tioning,the sludge concentration performance is good,and the load of the sludge pressure filtration treatment system does not change much compared to before the renovation.The experience of commissioning and operation of the transformation process shows that the magnetic coagulation process for the pre-treatment of industrial wastewater with high sludge production needs to consid-er both surface load and solid load as important parameters.
Magnetic coagulationPrinting and dyeing wastewaterRaw waterPretreatmentSurface loadSolid load
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