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Inorganic wastewater
①The wastewater mainly contains suspended solids, which can be discharged after standing for a period of time under normal conditions.
This kind of wastewater can be treated by natural sedimentation
.
Figure 1-11 AAO synchronous nitrogen and phosphorus removal process flow
Figure 1-13 The process flow of papermaking wastewater treatment in a paper mill
②Wastewater contains suspended solids, but the particles are small and cannot meet the discharge standard within the specified time.
This kind of water needs to be treated by the coagulation sedimentation method
③Waste water contains not only suspended matter, but also toxic substances.
When the suspended matter is removed, there are still harmful substances in the wastewater.
Consider adjusting the pH value, chemical precipitation, redox and other methods for treatment of this kind of wastewater
.
The process flow of oxidation treatment of cyanide-containing wastewater is shown in Figure 1-14
Figure 1-14 A certain chlorination treatment process flow of cyanide-containing wastewater treatment
④The wastewater containing soluble pollutants can be treated with advanced treatment methods such as adsorption, ion exchange, redox and so on
.
For wastewater with complex components, the treatment process is also more complicated.
The process flow of wastewater treatment in a fiber nylon factory is shown in Figure 1-15
.
The main object of waste water removal is formaldehyde (biological filter).
Figure 1-15 The production wastewater treatment process flow of a fiber nylon factory
(3) Oily wastewater The oily wastewater mainly comes from industrial sectors such as petroleum, petrochemical, steel, coking, gas generating stations, and mechanical processing
.
For oily pollutants in wastewater, except for heavy tar whose relative density is above 1.
①The particle size of the floating oil droplets is greater than 100um, which is easy to separate from the wastewater
.
②The particle size of the dispersed oil droplets is between 10-100um, suspended in water
.
③The particle size of emulsified oil droplets is less than 10um, which is not easy to separate from wastewater
.
Because the oil concentration in wastewater discharged from different industrial sectors is very different, such as wastewater generated in the oil refining process, the oil content is about 150-1000 mg/L, the tar content in coking wastewater is about 500-800 mg/L, and the wastewater discharged from gas generating stations is about 500-800 mg/L.
The tar content can reach 2000～3000mg/L
.
Therefore, the treatment of oily wastewater should first use an oil trap to recover slick or heavy oil.
Figure 1-16 The process flow of a certain oily production wastewater treatment
