Wastewater treatment is a process of purifying wastewater to reach a certain water quality in the drainage pipeline or reapply to water quality regulations. Wastewater treatment is widely used in various fields such as engineering and construction, agriculture and animal husbandry, transportation, electricity and energy, petrochemicals, environmental protection, urban landscape, diagnosis and treatment, restaurants, etc. It is also increasingly entering the daily lives of thousands of households. There are many methods for treating fluorine-containing wastewater in the electroplating process, organic fertilizer, ironmaking, and pesticide industries, and it is necessary to choose the appropriate method according to the actual water body needs.

At present, the treatment methods for fluorinated wastewater used in industry mainly include sedimentation, adsorption, ion exchange, membrane separation, etc.

1. Precipitation method

① Organic chemical precipitation method

② Concrete sedimentation method

2. Adsorption method

The adsorption method can continuously, efficiently, and steadily treat organic compounds, improve the BOD/COD of wastewater treatment, ensure biochemical treatment, and regenerate the adsorption raw materials. It is sturdy and durable, with a small total area, compact structure, high automation level, and convenient use.

Outeya - Case Study of Wastewater Treatment Process Figure 24.jpg

3. Ion exchange

Ion exchange equipment is simple, easy to operate, cost-effective, zero pollution, and has a significant fluoride removal effect. It is an ideal method for deep removal of fluoride ions in water.

4. Membrane separation method

Fluorine containing wastewater is collected in the regulating tank and buffered for water transformation. The regulating tank contains a compressed gas stirring device for water quantity and quality adjustment. The sewage in the regulating tank is pumped to the first stage for fluoride removal, which has three reaction zones. Lime powder slurry, polyaluminum iron chloride, and PAM are added to each reaction zone before entering the sedimentation zone for the first stage of fluoride removal. There is a sludge thickener in the sedimentation zone for sludge discharge. The first stage defluorination effluent flows into the second stage defluorination. The second stage defluorination has three reaction zones, in which defluorination agents, polyaluminum iron chloride, and PAM are added successively. Then, it enters the sedimentation zone of the second stage defluorination, which is equipped with a sludge thickener for sludge discharge. The secondary defluorination effluent flows into the outlet tank by itself, and acid is added to adjust the pH value in the outlet tank. At the same time, gas explosion is used to stir the water quality. After the sewage in the outlet pool is qualified, it is pumped by the ground pump to the industrial park to take over the pipeline network.

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