Product water quality requirements and the corresponding processing flow

Product water quality requirements and the corresponding processing flow

 

When the wastewater is discharged or reused with low water quality requirements, only screening and precipitation methods are needed to remove coarse impurities and suspended solids (often referred to as primary treatment); when organic matter is required to be removed, biological treatment method (often referred to as secondary treatment) is generally used after primary treatment For the wastewater after biological treatment, the treatment process is collectively referred to as three-stage treatment or advanced treatment. For example, when the wastewater is discharged into the water body to prevent eutrophication, the process of removing nitrogen and phosphorus belongs to three-stage treatment (see physical and chemical treatment of water). When the waste water is used as the water source, the water quality requirements of the finished water and the corresponding processing flow depend on its use. In theory, modern water treatment technology can produce any high quality product water from any inferior water.