Sewage refers to water that contains waste and polluting substances after use. Treating sewage to turn it into clean water is one of the key steps to solve the problem of environmental pollution. This article will introduce the fastest way to turn wastewater into clean water, including physical, chemical, and biological treatment.
Physical treatment refers to the use of physical methods to remove suspended solids and solid particles from sewage. Common physical treatment methods include screen filtration, sedimentation, flotation and evaporation.
1.Screen filtration
Screen filtration refers to the method of setting up a screen to block larger particles. Screens with different pore sizes can be set up to filter out solid particles of different particle sizes. This process is similar to the operation of sifting rice and water when we usually cook.
2.precipitation
Sedimentation refers to the use of gravity and time to settle solid particles in sewage to the bottom. This can be achieved by setting up a sedimentation tank or using equipment such as a centrifuge. The precipitated solid particles can be conveyed out through the conveyor, so that the clean water is separated from the solids.
3.Flotation
Flotation refers to the use of the adhesion and buoyancy of air bubbles to float the suspended solids in the sewage. This can be achieved by jetting, stirring, or adding chemicals. The floating suspended solids can be separated by fishing or centrifuge operation.
4.Evaporation
Evaporation refers to the heating of sewage to evaporate it, while solid particles and dissolved matter remain inside the container. The evaporated water vapor can be condensed into a liquid through the condenser to achieve the separation of clean water and residue.
Chemical treatment refers to the addition of chemical agents to change the properties of sewage, so that the waste and pollutants in the sewage are condensed, precipitated or oxidized. Common chemical treatment methods include coagulation, neutralization, oxidation and reduction.
1.Coagulation
Coagulation refers to the coagulation of suspended solids or dissolved substances in sewage by adding coagulants to facilitate separation. Commonly used coagulants are polymers, aluminum sulfate, etc. The solidified agglomerates can be separated by filtration or centrifuge.
2.Neutralization
Neutralization refers to the addition of alkaline or acidic substances to counteract the acidic or alkaline substances in the sewage and neutralize them. Neutralized effluents are easier to treat and separate solid particles.
3.Oxidation
Oxidation refers to the oxidation and decomposition of organic substances in sewage into harmless substances by adding oxidants. Commonly used oxidants are bleaching powder, hydrogen peroxide, etc. The oxidized effluent can be further treated for other processes.
4.Revert
Reduction refers to the reduction of heavy metal ions in sewage into metal precipitation by adding reducing agent, so as to achieve the purpose of removing heavy metals. Commonly used reducing agents are hydrogen sulfide, ferrous sulfate, etc. The reduced effluent can be treated in the following process.
Biological treatment refers to the process of using organisms to degrade and treat organic substances in sewage. The action of microorganisms and plants is used to convert organic matter into harmless substances. Common methods of biological treatment are aerobic treatment and anaerobic treatment.
1.Aerobic treatment
Aerobic treatment refers to the use of oxygen in the air to convert organic matter in sewage into carbon dioxide and water through the metabolic action of microorganisms. Aerobic treatment can be operated by biological filters, aeration tanks and other equipment.
2.Anaerobic treatment
Anaerobic treatment refers to the use of anaerobic microorganisms to convert organic matter into methane and carbon dioxide in the absence of oxygen. Anaerobic treatment can be operated using equipment such as biogas digesters.
In summary, the fastest way to turn sewage into clean water is to use a combination of physical, chemical and biological treatment. Physical treatment can quickly remove suspended solids and solid particles from wastewater, chemical treatment can change the properties of sewage and condense or oxidize pollutants, while biological treatment uses the action of microorganisms and plants to degrade organic matter. These methods can be combined according to the specific situation to achieve the purpose of quickly turning sewage into clean water.