With the rapid development of industry, the discharge of harmful substances such as phosphorus, cadmium, arsenic, and mercury in wastewater is increasing, causing great harm to the environment and human health. In order to effectively remove these harmful substances from wastewater, some effective treatment methods need to be employed.
To remove phosphorus from wastewater, chemical precipitation, adsorption, biological methods, etc. can be used. The chemical precipitation method is to separate phosphorus from wastewater in the form of precipitate by adding chemical agents to it. The adsorption method is to use the adsorption of adsorbents to remove phosphorus from wastewater. The biological law is to cultivate microorganisms in wastewater and convert phosphorus into harmless substances through the metabolism of microorganisms.
For the removal of cadmium, precipitation method, adsorption method, ion exchange method, etc. can be used. The precipitation method is to separate cadmium from wastewater in the form of a precipitate by adding chemicals to the wastewater. The adsorption method is to use the adsorption of adsorbents to remove cadmium from wastewater. The ion exchange law uses the ion exchange action of ion exchangers to remove cadmium from wastewater.
To remove arsenic from wastewater, oxidation, precipitation, adsorption, etc. can be used. The oxidation method is to oxidize arsenic to a harmless substance by adding an oxidant to the wastewater. The precipitation method is to separate the arsenic from the wastewater in the form of a precipitate by adding chemicals to the wastewater. The adsorption method is to use the adsorption of adsorbents to remove arsenic from wastewater.
The removal of mercury can be done by precipitation, adsorption, distillation, etc. The sedimentation method is to separate the mercury from the wastewater in the form of a precipitate by adding chemicals to the wastewater. The adsorption method is to use the adsorption of adsorbents to remove mercury from wastewater. The distillation method is to use the difference in the boiling points of mercury and water to distill mercury from wastewater.