Odor Control >> How To Get Rid Of Sewage Smell

Wastewater lift stations are facilities designed to move wastewater from lower to higher elevation through pipes. Key elements of lift stations include a wastewater receiving well (wet-well), often equipped with a screen or grinding to remove coarse materials; pumps and piping with associated valves; motors; a power supply system; an equipment control and alarm system; and an odor control system and How To Get Rid Of Sewage Smell ventilation system.

Lift station equipment and How To Get Rid Of Sewage Smell systems are often installed in an enclosed structure. They can be constructed on-site (custom-designed) or prefabricated. Lift station capacities range from 76 liters per minute (20 gallons per minute) to more than 378,500 liters per minute (100,000 gallons per minute). Pre-fabricated lift stations generally have capacities of up to 38,000 liters per minute (10,000 gallons per minute). 

Centrifugal pumps arecommonly used in lift stations. A trapped aircolumn, or bubbler system, that senses pressure and level is commonly used for pump station control. Other control alternatives include electrodes placedat cut-off levels, floats, mechanical clutches, and How To Get Rid Of Sewage Smell floating mercury switches. A more sophisticated control operation involves the use of variable speed drives.

Lift stations are typically provided with equipment for easy pump removal. Floor access hatches or How To Get Rid Of Sewage Smell openings above the pump room and an overhead monorail beam, bridge crane, or portable hoist arecommonly used.The two most common types of lift stations are thedry-pit or dry-well and submersible lift stations. 

Indry-well lift stations, pumps and valves are housedin a pump room (dry pit or dry-well), How To Get Rid Of Sewage Smell that is easilyaccessible. The wet-well is a separate chamber attached or located adjacent to the dry-well (pumproom) structure. Figures 1 and 2 illustrate the twotypes of pumps. Submersible lift stations do not have a separatepump room; the lift station header piping,associated valves, and flow meters are located in aseparate dry vault at grade for easy access.

Submersible lift stations include sealed pumps thatoperate submerged in the wet-well. These areremoved to the surface periodically and reinstalledusing guide rails and How To Get Rid Of Sewage Smell a hoist. A key advantage ofdry-well lift stations is that they allow easy accessfor routine visual inspection and maintenance. Ingeneral, they are easier to repair than submersiblepumps. 

An advantage of submersible lift stations isthat they typically cost less than dry-well stations and operate without frequent pump maintenance. Submersible lift stations do not usually include large above ground structures and How To Get Rid Of Sewage Smell tend to blend inwith their surrounding environment in residential areas. They require less space and are easier andless expensive to construct for wastewater flowcapacities of 38,000 liters per minute (10,000gallons per minute) or less.

APPLICABILITY Lift stations are used to move wastewater fromlower to higher elevation, How To Get Rid Of Sewage Smell particularly where theelevation of the source is not sufficient for gravit yflow and/or when the use of gravity conveyance will result in excessive excavation depths and highsewer construction costs. Current Status Lift stations are widely used in wastewater conveyance systems. 

Dry-well lift stations havebeen used in the industry for many years. However, How To Get Rid Of Sewage Smell the current industry-wide trend is to replace drywell lift stations of small and medium size(typically less than 24,000 liters per minute or 6,350 gallons per minute) with submersible lift stationsmainly because of lower costs, a smaller footprint,and simplified operation and maintenance.

Variable speed pumping is often used to optimizepump performance and minimize power use.Several types of variable-speed pumping equipmentare available, including variable voltage andfrequency drives, eddy current couplings, andmechanical variable-speed drives. Variable-speedpumping can reduce the size and cost of the wet well How To Get Rid Of Sewage Smell and allows the pumps to operate at maximumefficiency under a variety of flow conditions.

Because variable-speed pumping allows lift stationdischarge to match inflow, only nominal wet-wellstorage volume is required How To Get Rid Of Sewage Smell and the well water levelis maintained at a near constant elevation.Variable-speed pumping may allow a given flow range to be achieved with fewer pumps than a constant-speed alternative. 

Variable-speed stationsalso minimize the number of pump starts and stops,reducing mechanical wear. Although there issignificant energy saving potential for stations withlarge friction losses, it may not justify the additionalcapital costs unless the cost of power is relativelyhigh. Variable speed equipment also requires moreroom within the lift station and may produce more noise How To Get Rid Of Sewage Smell and heat than constant speed pumps.

Lift stations are complex facilities with manyauxiliary systems. Therefore, they are less reliablethan gravity wastewater conveyance. However, liftstation reliability can be significantly improved byproviding stand-by equipment (pumps and controls)and emergency power supply systems. In addition, How To Get Rid Of Sewage Smell lift station reliability is improved by using non-clogpumps suitable for the particular wastewater quality and by applying emergency alarm and automatic control systems.

ADVANTAGES AND DISADVANTAGES Advantages Lift stations are used to reduce the capital cost ofsewer system construction. When gravity sewers are installed in trenches deeper than three meters(10 feet), How To Get Rid Of Sewage Smell the cost of sewer line installationincreases significantly because of the more complex and costly excavation equipment and trench shoringtechniques required. 

The size of the gravity sewerlines is dependent on the minimum pipe slope and flow. Pumping wastewater can convey the sameflow using smaller pipeline size at shallower depth, How To Get Rid Of Sewage Smell and thereby, reducing pipeline costs. Disadvantages Compared to sewer lines where gravity driveswastewater flow, lift stations require a source ofelectric power. 

If the power supply is interrupted,flow conveyance is discontinued and can result inflooding upstream of the lift station, It can alsointerrupt the normal operation of the downstream wastewater conveyance and How To Get Rid Of Sewage Smell treatment facilities. This limitation is typically addressed by providingan emergency power supply.

Key disadvantages of lift stations include the highcost to construct and maintain and the potential forodors and noise. Lift stations also require asignificant amount of power, How To Get Rid Of Sewage Smell are sometimesexpensive to upgrade, and may create publicconcerns and negative public reaction. The low cost of gravity wastewater conveyance.

The higher costs of building, operating, and maintaining lift stations means that wastewaterpumping should be avoided, How To Get Rid Of Sewage Smell if possible andtechnically feasible. Wastewater pumping can beeliminated or reduced by selecting alternative sewerroutes or extending a gravity sewer using directiondrilling or other state-of-the-art deep excavationmethods. If such alternatives are viable, a costbenefit analysis can determine if a lift station is themost viable choice.

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