Wastewater collection system gas emission control

A wastewater collection system is given a gas withdrawal port such as a gasoline suction device. The gas is preferably withdrawn at a speed in excess of their gas generation by germs at the wastewater collection system so that a small negative pressure is created in the immediate vicinity of the gasoline withdrawal vent. A gas mixing chamber is coupled to the fan or blower to receive the gas withdrawn in the wastewater collection system. An ozone generation device is also coupled to the gas mixing chamber that’s adjusted to present adequate ozone to react with any noxious or malodorous components of the gas. A reaction conduit is offered at an output of the gas mixing chamber to receive the pulled ozone and gas. The reaction conduit has surface features promising turbulent flow of the gasses through the amount of the conduit. The reaction conduit is also of sufficient length as to guarantee complete decomposition and removal of the noxious or malodorous components from the pulled gas, and decrease of the ozone to a negligible concentration at the gas emitted from the reaction conduit.


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The present invention is directed normally to the control of undesirable odors usually generated by microbial action in waste water systems. The present invention is particularly directed to the reduction of such undesirable odors in theimmediate area of wastewater lift stations, pumping stations, and other pretreatment facilities.

Contemporary wastewater collection systems, often known as sewage systems, are designed to catch and transport effluent from resources such as houses, schools, offices and factories to a frequent wastewater treatment facility. At the treatmentfacility, the wastewater is biologically and chemically treated so the water can be released back into the environment with as little effect as possible. Treatment facilities are usually open to the air to market aerobic microbialprocesses to biologically reduce the undesirable features of the wastewater, and for that reason are generally located in remote, densely populated areas. The collection system causing the treatment facility generally is a normally closedsystem of pipes, except at certain selected points, so as to inhibit dilution of their wastewater by runoff as a result of nearby rain showers or snow melt. The normally closed nature of this system is also meant to avoid any unwanted dispersal of thewastewater to the environment prior to proper treatment at the treatment facility.

Pretreatment facilities such as lift stations and pumping stations are typically contained in the collection system at chosen points to gather and pump wastewater to a next channel and, finally, to a waste treatment plant. The pretreatmentfacilities typically incorporate a large concrete pit with quite a few incoming pipes carrying wastewater. A pump located in the pit or moist well is combined to an outflow pipe. The pump is usually controlled by buttons that are responsive to the levelof liquid from the pit. Generally, the pumps operate periodically, instead of continuously, with the level of wastewater from the pit falling during times that the pump is operating and increasing whenever the pump isn’t operating. When the pumps are notoperating and the wastewater is collecting, there’s more opportunity for the accumulation of significant populations of microbes that produce gases including hydrogen sulfide, methyl sulfide, methyl disulfide, mercaptans such as methyl mercaptan,ammonia, methylamines including di- and trimethylamine, different ethylamines and butylamines, pyridine, acetone, ketone, phenol, benzene, methane, butene, toluene, and lots of more, much of which is malodorous, noxious, and in a number of conditions, dangerousto human health and wellbeing. The primary atomic gas present is generally hydrogen sulfide.

The common changes in liquid level in the wet colonies of such pretreatment facilities requires the occurrence of vents which will permit entry of air into the pit since the wastewater level falls. Since the level of wastewater increases, the gases thataccumulate above the wastewater are usually released out the very same vents into the air. Since the wastewater lift stations, pumping stations, and other pretreatment facilities are sometimes located in the immediate area of human habitations,the discharge of such gases can be much to the disgust of the local human inhabitants. The odors can be quite strong especially when the accumulation period involving pumping operations is lengthy, or during summer once the temperatures are hot for extendedperiods thus encouraging the development of microbial populations. The total prevention of gasoline release at such pretreatment facilities is generally not a sensible choice. The remedy of such discharged gas in order to reduce its offensive personality is arealistic option that has got the attention of others .

It has been recognized that such poisonous and malodorous gasses are treatable generally by an use of ozone as mentioned, as an example,. in Kobayashi, et al., U.S. Pat. No. 5,145,657 and Monagan, U.S. Pat. No. 5,601,786. A variety ofequipment exists which can be used to create ozone including, for example, Lowther, U.S. Pat. Nos. 3,954,586; 3,984,697; and 3,996,474; Schwab, et al., U.S. Pat. No. 4,110,086; Vaseen, U.S. Pat. No. 4,317,044; Weaver, U.S. Pat. Nos. 5,160,481;5,173,268; and 5,751,007; and Kazi, et al., U.S. Pat. No. 5,578,280. Especially, it has been previously suggested in Dickerson, U.S. Pat. Nos. 5,433,854 and 5,578,211, such poisonous and malodorous gasses may be eliminated from wastewatersystems by an introduction of ozone into the machine at various points along with the upkeep of a minimal degree of nitrogen. It will be appreciated by those skilled in the art that the forced introduction of any gasoline within a closed space mustresult in either an elevated pressure within that distance or the displacement of a similar amount of the exact same or another gas from that distance through any accessible vent. As a practical matter, recognizing that no wastewater collection piping system iscompletely sealed, it has been discovered that the forced introduction of ozone into a wastewater collection piping system, as indicated by Dickerson, only enhances the displacement of this poisonous and malodorous gasses out of accessible vent points, substantially tothe displeasure and possible harm of men in the vicinity of the vents. Further, the coming of the ozone to the machine, in selected points such as lift stations and so on, has to be very carefully controlled to prevent substantial andsubstantial erosion of portions of this system by the highly oxidative ozone itself.

Additionally, it has been proven that such noxious and malodorous gasses are treatable normally by extracting the gasses in the wet well and passing the electrons through a bed of activated carbon. The carbon mattress will work satisfactorily for aperiod of time, yet, occasionally it has to be replaced, along with the spent carbon disposed of as required by legislation, normally at a toxic waste facility. Additionally, it has been proven that the replacement program for these carbon beds can be extended byexposing the activated carbon bed to a stream of ozone. Such equipment is available by Parson Environmental Products of Reading, Pennsylvania under the trademark carbOzone. This equipment isn’t satisfactory in that it is not able to get rid of odor”spikes” occurring during certain periods and requires the periodic disposal of the spent carbon. Furthermore, it’s understood that activated carbon and ozone can become shaky, and pose an explosion-fire danger if ozone levels exceed 0.3%. Therefore,the vulnerability of carbon beds into ozone should only happen under closely controlled and monitored conditions which are generally not found in normal wastewater pretreatment facilities, which are unmanned facilities.

It’s thus desirable to build a centre for treatment of gasses from wastewater lift stations, pumping stations, and other pretreatment facilities which will accommodate such odor”spikes” and doesn’t require the use of anymaterials, particularly hazardous waste substances, doesn’t pose an explosion-fire hazard, and emits no ozone to the atmosphere.

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