Odor Control >> Reasons For Sewage Smell From A Basement Drain

Cost effective lift stations are designed to: (1)match pump capacity, type, and configuration with wastewater quantity and quality; (2) provide reliable and uninterruptible operation; (3) allow for easy operation and maintenance of the installed equipment; (4) accommodate future capacity expansion; (5) avoid septic conditions and excessive release of odors in the collection system  Reasons For Sewage Smell From A Basement Drain and at the lift station.

Minimize environmental and landscape impacts on the surrounding residential and commercial developments; and (7)avoid flooding of the lift station and the surrounding areas.Wet-well Wet-well design depends on the type of lift station configuration (submersible or dry-well) and Reasons For Sewage Smell From A Basement Drain the type of pump controls (constant or variable speed).

Wet-wells are typically designed large enough toprevent rapid pump cycling but small enough toprevent a long detention time and Reasons For Sewage Smell From A Basement Drain associated odor release. Wet-well maximum detention time in constantspeed pumps is typically 20 to 30 minutes. Use ofvariable frequency drives for pump speed controlallows wet-well detention time reduction to 5 to 15 minutes. 

The minimum recommended wet-well bottom slope is to 2:1 to allow self-cleaning and Reasons For Sewage Smell From A Basement Drain minimum deposit of debris. Effective volume ofthe wet-well may include sewer pipelines,especially when variable speed drives are used.Wet-wells should always hold some level of sewage to minimize odor release. Bar screens or grindersare often installed in or upstream of the wet-well to minimize pump clogging problems.

Wastewater PumpsThe number of wastewater pumps and associated capacity should be selected to provide head capacity characteristics that correspond as nearly as possible to wastewater quantity fluctuations. This can be accomplished by preparing pump/pipeline system head-capacity curves showing all conditions of head (elevation of a free surface of water) and  Reasons For Sewage Smell From A Basement Drain capacity under which the pumps will be required to operate.

The number of pumps to be installed in a lift stationdepends on the station capacity, the range of flow Reasons For Sewage Smell From A Basement Drain and the regulations. In small stations, with maximum inflows of less than 2,640 liters perminute (700 gallons per minute), two pumps are customarily installed, with each unit able to meetthe maximum influent rate. 

For larger lift stations,the size and number of pumps should be selected so that the range of influent flow rates can be met without starting and stopping pumps too frequently and without excessive wet-well storage. Depending on the system, Reasons For Sewage Smell From A Basement Drain the pumps are designed to run at a reduced rate. The pumps may also alternate to equalize wear and tear. 

Additional pumps may provide intermediate capacities better matched to typical daily flows. An alternative option is to provide flow flexibility with variable speed pumps. For pump stations with high head-losses, Reasons For Sewage Smell From A Basement Drain the single pump flow approach is usually the most suitable. Parallel pumping is not as effective for such stations because two pumps operating together yield only slightly higher flows than one pump. 

If thepeak flow is to be achieved with multiple pumps inparallel, the lift station must be equipped with atleast three pumps: two duty pumps that together provide peak flow and Reasons For Sewage Smell From A Basement Drain one standby pump foremergency backup. Parallel peak pumping istypically used in large lift stations with relativelyflat system head curves. 

Such curves allowmultiple pumps to deliver substantially more flowthan a single pump. The use of multiple pumps inparallel provides more flexibility. Several types of centrifugal pumps are used inwastewater lift stations. In the straight-flowcentrifugal pumps, wastewater does not change direction as it passes through the pumps and Reasons For Sewage Smell From A Basement Drain intothe discharge pipe. 

These pumps are well suited forlow-flow/high head conditions. In angle-flowpumps, wastewater enters the impeller axially and Reasons For Sewage Smell From A Basement Drain passes through the volute casing at 90 degrees to itsoriginal direction (Figure 3). This type of pump isappropriate for pumping against low or moderateheads. Mixed flow pumps are most viable forpumping large quantities of wastewater at low head.

In these pumps, the outside diameter of the impelleris less than an ordinary centrifugal pump, Reasons For Sewage Smell From A Basement Drain increasing flow volume.Ventilation Ventilation and heating are required if the liftstation includes an area routinely entered by personnel. Ventilation is particularly important to prevent the collection of toxic and/or explosive gases. 

According to the Nation Fire Protection Association (NFPA) Section 820,  Reasons For Sewage Smell From A Basement Drain all continuous ventilation systems should be fitted with flow detection devices connected to alarm systems to indicate ventilation system failure. Dry-well ventilation codes typically require six continuous air changes per hour or 30 intermittent air changes per hour. 

Wet-wells typically require 12 continuous air changes per hour or 60 intermittent air changes per hour. Motor control center (MCC) rooms should have a ventilation system adequate to provide six air changes per hour and  Reasons For Sewage Smell From A Basement Drain should be air conditioned to between 13 and 32 degrees Celsius(55 to 90 degrees F). 

If the control room is combined with an MCC room, Reasons For Sewage Smell From A Basement Drain the temperature should not exceed 30 degrees C or 85 degrees F. All other spaces should be designed for 12 air changes per hour. The minimum temperature should be 13 degrees C (55 degrees F) whenever chemicals are stored or used. Odor control is frequently required for lift stations.

A relatively simple and widely used odor controlalternative is minimizing wet-well turbulence. More effective options include collection of odors generated at the lift station and Reasons For Sewage Smell From A Basement Drain treating them inscrubbers or biofilters or the addition of odor control chemicals to the sewer upstream of the liftstation. Chemicals typically used for odor controlinclude chlorine, hydrogen peroxide, metal salts(ferric chloride and ferrous sulfate) oxygen, air, and potassium permanganate. 

Chemicals should be closely monitored to avoid affecting downstream treatment processes, Reasons For Sewage Smell From A Basement Drain such as extended aeration. Power Supply The reliability of power for the pump motor drivesis a basic design consideration. Commonly usedmethods of emergency power supply includeelectric power feed from two independent powerdistribution lines.

An on-site standby generator; an adequate portable generator with quick connection; a stand-by engine driven pump; ready access to asuitable portable pumping unit and Reasons For Sewage Smell From A Basement Drain appropriate connections; and availability of an adequate holdingfacility for wastewater storage upstream of the liftstation.

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