Regarding hydrogen sulfide in wastewater
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I would like to ask: the wastewater from the vent tower contains 1100 mg/L of sulfides (hydrogen sulfide) at 60°C. Is it necessary to install toxic gas detectors near the wastewater tank? I calculated that this concentration is not that of a saturated aqueous solution, so hydrogen sulfide gas should not leak out; I’m not sure if that’s correct
It should be set up; if there is a check in place, he won’t care whether it leaks or not
It’s an open environment; no setup is required. However, operators need to wear toxic gas detectors. 【Haichuan Equipment Guessing Game】What is hanging on this chest? https://bbs.hcbbs.com/thread-3223320-1-1.html
Does that mean hydrogen sulfide must be dissolved in water; it can’t survive without water?
Yes, this concentration has already reached a lethal level
A lift pump area for the sewage tank should be installed! It should be given high priority.
The fact that a gas is not saturated when dissolved in a liquid does not mean it will not escape; this is related to partial pressure and temperature.
2. Inquiry: Underground fire water tank; no one enters it； An underground septic tank, 1 meter below the ground surface, where no one enters ； 3m3 air storage tank, with a manhole, but it contains air and no one enters it ； Is a place like this considered a confined space? Inquiry date: 2021-12-09 Reply: Thank you for your message. Industrial and trade enterprises should make judgments in accordance with the second paragraph of Article 2 of the Interim Provisions on Safety Management and Supervision of Work in Confined Spaces in Industrial and Trade Enterprises (Order No. 59 of the State Administration for Work Safety), taking into account the actual conditions on site. Under normal circumstances, septic tanks contain toxic and harmful substances as well as flammable and explosive materials, and since cleaning, inspection, and maintenance tasks are required, they should be managed as confined spaces. Fire water tanks and air storage tanks do not need to be classified as confined spaces for management, provided that the company confirms that there is no accumulation of toxic, harmful, flammable, or explosive substances in these areas, nor is there an insufficient oxygen level during operations. Responding department: Bureau of Safety Law Enforcement and Industry and Trade Supervision. Response date: 2021-12-16