vaccum sewerage systems
DESCRIPTION
Vacuum sewerage is a mechanized system of wastewatertransport. Unlike gravity flow, it uses differential airpressure to move the wastewater. It requires a centralsource of power to run vacuum pumps which maintainvacuum on the collection system . Thesystem requires a normally closed vacuum/gravityinterfacevalveat each entrypointtosealthelinessothatvacuum is maintained. These valves, located in a pit,open when a predetermined amount of wastewateraccumulates in the collecting sump. The resultingdifferential pressure between atmosphere and vacuumbecomes the driving force that propels the wastewatertowards the vacuum station.TRANSCRIPT
VACUUM SEWERAGE SYSTEMSTHE NEW CONCEPT OF WASTE WATER COLLECTION
PRESENTED BY GUNJAN DISAWAL
DEPARTMENT OF CIVIL ENGINEERING
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Introduction
Vacuum sewerage systems is method of disposing of sewage in the sophisticated and reliable way.
Alternative way of sewage disposal.
Wide applications in future.
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Vacuum Sewerage Systems Vacuum sewerage system works due to
differential air pressure. Working of Vacuum sewerage system.
1. Based on differential air pressure.
2. Interface valves works pneumatically.
Schematic Vacuum Sewerage Technology
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3. Air-to-liquid ratio is the key for reliable transport.
4. Automatic optimization of air-to-liquid ratio offers more application and security.
5. Saw tooth profile keeps sewer lines shallow.
6. Pumping of sewage.
Discharge of Effluent in Vacuum System takes place via a Collection sump with an interface valve
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The Components
The main elements of Vacuum Sewerage System are:
1. Collection Chambers / Interface Units
2. Vacuum Lines / Hydro-pneumatic Transport
3. Vacuum station
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1. Collection Chambers / Interface Units
Function of collection chamber and interface units. Addition of air. Working of interface valve. Interface valves are membrane type. Diameter restricted to prevent clogging. Collection chamber at each house.
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Vacuum sewer line work on the elevation profiles i.e. high or low points.
Flow situations cannot be described by hydraulic laws.
Conveyance take place by means of two phase regime.
Sewers are laid in the form of saw-tooth profile.
2. Vacuum Lines / Hydro- pneumatic Transport
The starting movement of sewage bulb. when the sub pressure is strong enough, sewage portion will be shifted over the next peak in the form of a bulb
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Gradual flow of sewage by “tooth by tooth” mechanism to the vacuum station.
Movement of each bulb changes the pressure situation for the next bulb. Usually HDPE or PVC pipes used. Inspection pipes at every 100m.
The saw-tooth profile vacuum sewer line.
Sewage is shifted sequentially in the form of bulb.
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3.Vacuum StationWORKING
Wastewater and air is driven to a collection tank at the vacuum station.
Vacuum generators maintain vacuum in the tank. Only place where energy required. Vacuum station consists of rotary vane vacuum pumps
and sewage pumps. Vacuum pump maintains negative pressure. Vacuum pumps run only for few hours a day.
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Operation and Maintenance Vacuum systems are reliable and nearly trouble
free. Visual inspection at regular interval of collection
pits. Regular visit to the vacuum station required.
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Advantages Low investment costs. Saves material cost. Flexibility of piping. No pumping stations required for lifts. No odours, no corrosion of pipes, no danger. No manholes are required. Sedimentation, infiltration does not take place. Absolutely leakage free. Reduced installation time. No disturbance to inhabitants. Immediate detection of leakage.
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Fields of application Especially difficult situations such as ribbon,
peripheral settlement on flat terrain, with high pipe lengths of longer than 4 meters per inhabitant.
Can pass through water protection areas and areas with sensitive high ground water table.
Feasible solution in adverse gradient, unfavorable soil, missed ground inclinations.
Rural areas where buildings are not close to each other as well as in the congested areas.
Only solution for refurbishment of sewer systems. Areas of seasonal settlements such as recreation
areas , camping sites, farm houses or holiday resorts, etc.
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Conclusion High potential in future. Clean solution for the future High installation and operation costs are
prejudices only. Vacuum sewerage system seems to become more
and more adaptable. Poland –largest vacuum system for more than 30,000
inhabitants with 4 pre–mounted vacuum stationsDubai – 2000 villas connected by approximate
1000km of vacuum sewer lines to one central vacuum station that too underground on man-made island PALM JUMEIRAH
Use of environmental-friendly sewer system.
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T HANK
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