Solution of toxic and harmful gas in sewage pipeline

The inlet pipes of the sewage treatment plant, such as clean water tank, concentration tank, underground sewage, sludge gate well and stagnant sewage tank, may produce toxic gases. There are many kinds of toxic gases, which can be roughly divided into three categories: toxic gases, corrosive gases and flammable and explosive gases.
 

Toxic gases include methane, hydrogen sulfide, carbon monoxide, carbon dioxide, hydrogen cyanide, etc., which will harm the internal organs of the human body through the respiratory organs, inhibit the oxygen exchange capacity of the internal tissues or cells of the human body, and cause asphyxiating poisoning due to lack of oxygen in the body tissues. Therefore, it is also called asphyxiating gas.
 

Disinfection gases in sewage treatment plants are mostly corrosive gases, such as chlorine, ozone and chlorine dioxide, which corrode the respiratory system of human body.
 

Flammable and explosive gases, such as methane and hydrogen, are mostly produced in the process of sewage treatment.
 

To solve the gas safety problem of sewage pipeline, it is necessary to understand which part produces what gas.

The main odor generated by the inlet lifting pump room of the sewage treatment plant is hydrogen sulfide;

The odor generated during the anaerobic digestion of sludge in the primary sedimentation tank is mainly hydrogen sulfide and other sulfur-containing gases;

Ammonia and other volatile substances will be produced during sludge digestion;

Ammonia, amine, sulfide, fatty acid, aromatic and dimethyl sulfur will be produced in the process of waste composting;

Good oxidation and sludge air drying process may produce a small amount of hydrogen sulfide, but mainly mercaptan and dimethyl sulfur gas.

For these toxic and harmful gases, the sewage treatment plant can install toxic and harmful gas detectors and combustible gas alarms at different locations, such as methane gas detection alarm, carbon monoxide gas detection alarm, carbon dioxide gas detection alarm, etc. Moreover, it is also required to be installed according to national regulations.

Gas alarms are fixed and portable, which can be combined in the installation process of sewage treatment plant. The fixed alarm will be monitored in real time for 24 hours. Once the gas concentration exceeds the standard, the alarm will be displayed. The higher the gas concentration, the stronger the electrical signal. At the same time, the safety supervision bureau also requires that the sewage treatment plant must be equipped with safety protection articles in accordance with the provisions of the Safety Supervision Bureau, such as gas masks, air respirators, protective clothing, portable gas detectors, labor protection safety shoes, protective gloves and other safety protection articles, so as to ensure the safety of operators in the work process.

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