Sewer gas

Methanethiol has been found in sewer gases (8,9) and is thought to be produced by the bacterial degradation of methionine. Methanethiol,... 

At inlet structures to treatment plants and pumping stations, sewer gases may be emitted to the atmosphere. To avoid odor nuisance, this gas may need treatment. Such methods have been widely used in the mining and coal gas industries to remove hydrogen sulfide from gases (Herrygers et al 2000). 

Hydrogen sulfide occurs in natural gas. It also is found in many sewer gases. It is a by-product of many industrial processes. Trace amounts of dissolved H2S are found in wastewaters in equilibrium with dissolved sulfides and hydrosulfides. It also is found in volcanic eruptions, hot springs and in troposphere. The average concentration of H2S in the air is about 0.05 ppb. 

Floor drains must be flooded with water periodically in order to fill traps and prevent the backflow of sewer gases. 

Manholes with open tops covered with grating may be used to collect surface drainage as explained for catch basins. The grating cover for sealed manholes requiring vent connections should be filled with concrete and sealed or bolted down tightly to prevent the escape of sewer gases. 

A sudden rush of liquids from equipment into the drainage system would cause compression of entrapped gases in the sewer ahead of the stream and a vacuum behind the stream. Such pulsation drains all the traps and permits permeation of odors and sewer gases. The breather system, by proper installation of vents, is always installed according to code. In order to prevent the back rush of liquids, a ball check is installed ahead of a condenser. Both check valve and subsequent trap should be accessible for cleanout. The bell of the trap extends down from the perforated or gridded floor screen and covers a portion of the drain pipe extending above the bottom of the drain pit. More commonly the floor drains, drain screen, bell, and outside case of the pit are cast iron. 

DWV (drain-waste-vent)- The section of a plumbing system that carries water and sewer gases out of a home. ... 

Kanal, m. canal channel conduit sewer flue tunnel, -gas, n. sewer gas. 

Kloake,/. cloaca, sewer sink cesspool. Eloaken-gas, n. sewer gas. -wasser, n. sewage. Elc ben, m. pulley, block vise pincers log. kltkkun, prst. (of klimmen) climbed. 

Schleuse,/. sluice sewer airlock. Schleusengas n. sewer gas,... 

Hydrogen sulfide is a colorless gas that smells like rotten eggs. Because of its smell, it is often called stink gas or sewer gas. It is also poisonous. Because of its toxic nature, and smell, a Kipp s apparatus generating hydrogen sulfide gas should always be kept under a fume hood. 

Hydrogen sulfide is a colorless, flammable gas under normal conditions. It is commonly known as hydrosulfuric acid, stink damp, and sewer gas. Hydrogen sulfide smells like rotten eggs. People can smell hydrogen sulfide at concentrations as low as 0.5 parts of hydrogen sulfide per billion parts of air (ppb, 1 ppb is 1,000 times less than 1 part per million [ppm]). However, at concentrations over 100 ppm most people can no longer smell hydrogen sulfide, which makes it... 

Synonym(s) Hydrosulfuric acid stink damp sulfur hydride sulfurated hydrogen dihydrogen monosulfide dihydrogen sulfide sewer gas HSDB 1998... 

Thoman M. 1969. Sewer gas Hydrogen sulfide intoxication. Clin Toxicol 2 383-386. 

A different approach for sewer gas cleaning is to use bioscrubbers. In a bioscrubber, the polluted gas is absorbed into a liquid and then degraded in an activated sludge process. 

An explosion demolishing an empty building was dubiously attributed to ignition of methane evolved from bat droppings [1]. There was much argument as to the probability of this [2], the eventual conclusion being that sewer gas from a septic tank was responsible. 

Formula H2S MW 34.08 CAS [7783-06-4] ocurs in natural gas and sewer gas formed when metal sulfides react with dilute mineral acids colorless gas with rotten egg odor liquefies at -60.2°C solidifies at 85.5°C slightly soluble in water (4000 mg/L at 20°C) aqueous solution unstable, absorbs oxygen and decomposes to sulfur highly toxic and flammable. 

Related Calculations. Use the method given here when making combustion calculations for any type of gas used as a fuel—natural gas, blast-furnace gas, coke-oven gas, producer gas, water gas, sewer gas—from any source, domestic or foreign, in any type of furnace—boiler, heater, process, or waste-heat. When the air used for combustion contains moisture, as is usually true, this moisture is added to the combustion-formed moisture appearing in the products of combustion. Thus, for 80°F (300 K) air of 60 percent relative humidity, the moisture content is 0.013 lb per pound of dry air. This amount appears in the products of combustion for each pound of air used and is a commonly assumed standard in combustion calculations. 

Move sewer and sewer gas adsorption system above-grade Segregate process water from rainwater Enclose or redesign API separator... 

Synonyms Sulfur hydride Dihydrogen sulfide Hydrosulfuric acid Stink damp Sewer gas... 

SEWER GAS (7783-06-4) A highly flammable and reactive gas. Violent reaction with strong oxidizers, metal oxides, metal dusts and powders, bromine pentafluoride, chlorine trifluoride, chromium trioxide, chromyl chloride, dichlorine oxide, nitrogen trichloride, nitryl hypofluorite, oxygen difluoride, perchloryl fluoride, phospham, phosphorus persulfide, silver fulminate, soda-lime, sodium peroxide. Incompatible with acetaldehyde, chlorine monoxide, chromic acid, chromic anhydride, copper, nitric acid, phenyldiazoniumchloride, sodium. Forms explosive material with benzenediazonium salts. Attacks many metals. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

SYNONYMS dihydrogen sulfide, hydrogen sulfiiric acid, hydrosulfuric acid, sewer gas, sufuretted hydrogen, sulfur hydride. 

Synonyms/Trade Names Hydrosulfuric acid. Sewer gas. Sulfuretted hydrogen ... 

Hydrogen sulfide is used as an analytical reagent and in the manufacture of heavy water. It occurs in natural gas and sewer gas. It is formed by the reaction of a metal sulfide with dilute mineral acid, and in petroleum refining. 

Hydrogen sulfide (sewer gas [CAS 7783-06-4)) Vapors irritating to eyes and respiratory tract. At higher ieveis, a potent, rapid systemic toxin causing ceiiuiar asphyxia and death. Systemic ettects ot iow-ievei exposure inciude headache, cough, nausea, and vomiting. See aiso p 224. 

CAS 7783-06-4 EINECS/ELINCS 231-977-3 UN 1053 (DOT) FEMA 3779 Synonyms Hydrogen sulfuric acid Hydrogen sulphide Hydrosulfuric acid Sewer gas Sour gas... 

Setoglaucine. See Basic blue 1 Severe acid-treated middle distillate. See Petroleum distillates, acid-treated middle Severely hydrotreated light distillates. See Petroleum distillates, hydrotreated light Severely solvent-refined light naphthenic distillate. See Petroleum distillates, light naphthenic, solvent-refined Sewer gas. See Hydrogen sulfide Seychelles cinnamon leaf oil. See Cinnamon... 

Obtain facility drawings, diagrams, and/or photos showing all water mains, valves, and meters for the facility. These drawings, diagrams, and/or photos should accurately show main lines for all utilities including water, sewer, gas, electric, cable television, and telephone. Describe their physical relationship to each other. 

Wu, X., Li, Y., Su, X., Shang, B., Application of SPS and TGNET in natural gas pipeline network simulation, ICPTT 2009 conference on Advances and Experiences with Pipelines and Trenehless Teehnology for Water, Sewer, Gas, and Oil Applications, pp. 416-422, 2009. 

Location of jobsite Proximity to fuel tanks, sewers, gas lines, old landfills, coal deposits, and swamps ... 

---