Hydrogen sulfide is a colorless gas with putrid smell. It is soluble in water, ethanol and glycerol. Due to the particularity of sewage treatment plant, malodorous gas containing hydrogen sulfide and ammonia will be produced in the process of production and operation. The release of hydrogen sulfide in sewage into the air will cause certain harm to the environment and human body.
The main sources of H2S in the sewage treatment plant are anaerobic environment areas such as water collecting well, regulating hydrolysis tank, hydrolysis sedimentation tank and sludge treatment area in the inlet area. It can be produced in two main ways. The following industrial production network describes these two ways in detail:
(1) Under the action of sulfate reducing bacteria (SRB), H2, lactic acid, fatty acid, ethanol and other electrons are donors at a very low redox potential (- 200mV? – 300mV), and NH3 is the nitrogen source to reduce sulfate to H2S;
(2) Hydrolysis of sulfur-containing organic substances, such as cysteine, cystine, methionine, etc., to produce H2S. Among them, the reduction of sulfate reducing bacteria is the main cause of H2S.
There will also be a certain concentration of hydrogen sulfide in the staff office or rest area. The maximum allowable concentration of hydrogen sulfide in the air is 10 mg / m3 (7 ppm). The concentration of hydrogen sulfide in some treatment units of the sewage treatment plant can sometimes reach tens to hundreds of ppm. When the concentration is too high, it will cause human headache, dizziness, nausea, vomiting and other symptoms, and more serious may appear acute eye irritation or pulmonary edema.
In view of the great harm of hydrogen sulfide to human body, it is necessary to detect the content of hydrogen sulfide in sewage plant in real time, so as to take reasonable protective measures in time and inhibit the harm of hydrogen sulfide to human body.
Therefore, the use of hydrogen sulfide sensor is a protective measure that needs to be taken by the sewage treatment plant. On the one hand, the hydrogen sulfide sensor can monitor the concentration of hydrogen sulfide in the air in real time. When the concentration of hydrogen sulfide exceeds the safe range, it can remind people to take anti-virus measures in time, and can also protect the personal and property safety of the sewage treatment plant. A hydrogen sulfide sensor represented by industrial mining network is suitable for sewage plants in China:
American spec sensors hydrogen sulfide sensor (H2S sensor) – 3sp-h2s-50. This hydrogen sulfide sensor is easy to integrate into wireless, handheld and other network solutions. Because of its high performance, low cost and small volume, it has become the first choice in many fields.
For convenience, Xiaobian also provides H2S analog output module ulpsm-h2s 968-003 of H2S sensor module. The H2S analog output module is equipped with H2S sensor 3sp-h2s-50, which saves the development steps and saves the cost.