What are the toxic and harmful gases in the sewage treatment

Wastewater treatment is mainly for domestic sewage, production wastewater, industrial wastewater and other polluted water purification treatment to remove the pollutants in the water. Sewage treatment plants play an increasingly important role in our daily lives and production operations, but due to the complex structure of sewage treatment plants, sewage treatment process is complex and diverse, will produce a large number of dangerous gases. According to the different ways of harm, they can be divided into two categories: toxic gases (asphyxiating gases), flammable and explosive gases.



 
What hazardous gases will be produced in wastewater treatment plants?
 
1. Toxic gases such as hydrogen sulfide
 
Hydrogen sulfide is an inorganic compound with the chemical formula H₂S. Under normal circumstances, it is a colorless, flammable and acidic gas, which is highly toxic. Stirring sludge and sewage in a small space can make the local concentration of hydrogen sulfide too high, and when workers do not pay attention to personal protection, acute hydrogen sulfide poisoning or even death may occur.
 
2. Flammable and explosive gas
 
As the sewage contains a large number of microorganisms, so the sewage treatment plant will produce methane gas. The main component of biogas is methane, methane not only has the risk of explosion, but also can lead to a reduction in oxygen concentration and suffocation. Moreover, if it leaks out of the digester, it may also lead to an explosion.
 
Seasonality is a major pattern of accidents in wastewater treatment plants, May to September is the high incidence of accidents in wastewater treatment plants. The main accidents are: poisoning and asphyxiation, explosion, drowning, and fall.
 
Among them, the poisoning events caused by hydrogen sulfide and the explosion and asphyxiation events caused by methane, is the main accident in the sewage treatment plant; it is also the focus and difficulty of changing the safe living conditions in the sewage treatment plant.
 
Therefore, the good monitoring of toxic and harmful gases in wastewater treatment plants is a pressing problem nowadays.
 
Toxic and harmful gas solutions
 
In summary, the general detection of gases in wastewater treatment plants are combustible gases and hydrogen sulfide two gases, gas detection solutions are a combination of portable and fixed detectors.
 
In inspection wells, cesspools, pipe networks, trenches and other accident-prone locations, the installation of fixed hydrogen sulfide gas detection alarm, combustible gas detection alarm, gas alarm controller, fans, etc., can form a gas monitoring system with real-time monitoring and timely warning.
 
Staff can view the instrument status and plant gas leakage in real time through the computer terminal. When the concentration of toxic and harmful gas leakage reaches the preset value of the instrument, the alarm will immediately send out an acoustic and optical alarm signal, and can also transmit the alarm information to the computer terminal, which is convenient for staff to sense in time and handle remotely to prevent accidents.
 
The staff needs to use a combination of portable and fixed gas detection equipment when they enter the sewage well operation. Gas storage areas, ozone generators, rooms through which gas piping passes, and water treatment plants should always have fixed detectors to detect specific gases (or gas mixtures).
 
In addition, when operators need to enter enclosed spaces where hazardous gases are present, carry portable detectors as an additional safety precaution, even if fixed detectors are already installed in these areas. For example, you can carry a composite gas detector to monitor the concentration of hydrogen sulfide, gas and oxygen in real time downhole.
 
In the context of the global emphasis on the environmental protection industry and the increasing support of the times, sewage treatment plants should firmly establish the concept of safe development, according to the law to fulfill the main responsibility for safe production, the installation of toxic and harmful gas detection alarm, a comprehensive survey of potential safety accidents. At the same time, the staff should also be normalized, universal prevention and control to deal with hidden and sudden risks, the dam of safety production in sewage treatment plants to build a good guard.