Treating high COD wastewater is an important environmental problem, and it requires effective measures to be taken to solve it. Here are some effective ways to deal with high COD wastewater:
1.Biological treatment: Through the action of microorganisms, organic matter is converted into stable substances, so that sewage can be purified. Biological treatment can be divided into two ways: anaerobic and aerobic. The anaerobic treatment method is mainly suitable for the treatment of high-concentration organic wastewater, and the aerobic treatment method is suitable for the treatment of medium- and low-concentration organic wastewater.
2.Chemical treatment method: the organic matter in the sewage is converted into harmless substances through chemical reaction, so as to achieve the purpose of purification. Chemical treatment methods can be divided into precipitation method, redox method, chemical precipitation method, etc. The sedimentation method is to add a precipitant to the wastewater to precipitate the suspended solids in the wastewater, so as to achieve the purpose of purification;The redox method is to oxidize or reduce the organic matter in the wastewater to harmless substances by adding oxidants or reducing agents to the wastewater;The chemical precipitation method is to add precipitants and chemical agents to the wastewater to precipitate the heavy metal ions or harmful substances in the wastewater, so as to achieve the purpose of purification.
3.Physical treatment method: through physical action, the suspended solids, oil, heavy metals and other substances in the sewage are separated, so as to achieve the purpose of purification. Physical treatment methods can be divided into filtration method, adsorption method, extraction method, etc. The filtration method is to separate the suspended solids, particulate matter and other substances in the wastewater through the filter medium;The adsorption method is to adsorb the harmful substances in the wastewater on the surface through adsorbents, so as to achieve the purpose of purification;The extraction method is to add an extractant to the wastewater, so that the harmful substances in the wastewater are transferred to the extractant, so as to achieve the purpose of purification.
The above are several common methods for treating high COD wastewater, different methods are suitable for different water quality and environmental conditions, so in practical applications, it is necessary to choose the appropriate method according to the actual situation. At the same time, in order to ensure the effectiveness of sewage treatment, it is also necessary to strengthen the maintenance and management of sewage treatment facilities to ensure the normal operation of facilities and the stability of effluent water quality.
In addition to the above common methods, there are also some new treatment methods such as electrochemical method, photocatalytic oxidation method, ultrasonic treatment method, etc. These methods have the advantages of good treatment effect, low energy consumption and no secondary pollution, but at the same time, they also have problems such as high equipment cost and poor stability, which need further research and improvement.
In short, the treatment of high COD wastewater requires comprehensive measures to choose the appropriate method for treatment according to the actual situation. At the same time, it is also very important to strengthen the maintenance and management of sewage treatment facilities. Only through scientific and reasonable methods and technical means can we effectively solve the problem of high COD sewage and protect the environment and water resources.