Hydrogen sulfide is a colorless gas with a putrid smell and is soluble in water, ethanol and glycerol. Due to the particularity of sewage treatment plants, malodorous gases containing hydrogen sulfide and ammonia are produced during production and operation. The release of hydrogen sulfide from sewage into the air can cause certain harm to the environment and human health.
The main sources of H2S in sewage treatment plants are anaerobic environmental areas such as the collection well in the influent area, the regulating hydrolysis tank, the hydrolysis sedimentation tank and the sludge treatment area. It can be produced in two main ways.
(1).The role of sulfate-reducing bacteria (SRB) at a very low REDOX potential (-200mV?) At -300mV), H2, lactic acid, fatty acids, ethanol and other electrons serve as donors, and NH3 is the nitrogen source, which reduces sulfate to H2S.
(2).Hydrolysis of sulfur-containing organic substances, such as cysteine, cystine, methionine, etc., generates H2S after hydrolysis. Among them, the reducing action of sulfate-reducing bacteria is the main cause of H2S.
There can also be a certain concentration of hydrogen sulfide in the staff's office or rest area. The maximum allowable concentration of hydrogen sulfide in the air is 10 mg/m ³ (7 ppm), and the concentration of hydrogen sulfide in some treatment units of sewage treatment plants can sometimes reach tens to hundreds of ppm. When the concentration is too high, it can cause symptoms such as headache, dizziness, nausea and vomiting in the human body. In more severe cases, acute eye irritation symptoms or pulmonary edema may occur.
Given the significant harm of hydrogen sulfide to the human body, it is necessary to detect the content of hydrogen sulfide gas in sewage treatment plants in real time, so as to take reasonable protective measures promptly and suppress the damage of hydrogen sulfide to the human body.
Therefore, the industrial h2s gas detector is a protective measure that sewage treatment plants need to take. Hydrogen sulfide sensors can monitor the concentration of hydrogen sulfide in the air in real time. When the concentration of hydrogen sulfide gas exceeds the safe range, they can remind people to take anti-virus measures in time and also protect the personal and property safety of sewage treatment plants.