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Vacuum Sewerage System - Palm Jumeirah, Dubai

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Vacuum Sewerage System - Palm Jumeirah, Dubai Vacuum Sewerage System - Palm Jumeirah, Dubai Corodex Electromechanic Bringing Engineering Solutions to Life System Highlights World’s Biggest Vacuum Station Over 2000 Villas Connected 900 Collection Chambers 40km of Vacuum Sewer Line Savings over traditional gravity system INTRODUCTION SCOPE OF WORK accumulates in the sump, an inter- In August 2002 Nakheel the Design, supply, installation, com- face valve automatically opens. Master Developer of Palm Jumei- missioning, operation, and mainte- The batch volume plus an addi- rah Island awarded Corodex Elec- nance of a Vacuum Sewerage tional volume of air flows through tromechanic the Vacuum Sewer- System for Palm Jumeirah Island. the open valve and is transported age System contract for to-be the to a centralized vacuum station. eighth wonder of the world. SYSTEM GENERAL Vacuum sewer pipes are arranged The Vacuum Sewerage System, with high and low points in a spe- supplied by Roediger Vacuum INFORMATION cific elevation profile. Batches of Gmbh, supports more than 2,000 Vacuum sewerage systems are wastewater come to rest at low villas, having 900 collection wastewater collection systems. An points in the pipe. When air is chambers and 40 km of vacuum air stream generated by differential introduced through an upstream sewer line to a central Roevac air pressure drives the wastewater interface valve, the wastewater is vacuum station, which is installed toward a vacuum station. pushed plug-wise over subsequent underground in the utilities build- high points toward the vacuum ing on Palm Jumeirah. A vacuum sewer system is consists station. of: i) A vacuum station, where the The vacuum station for the Palm vacuum is generated, the wastewa- Jumeirah Development, with a Wastewater and air are driven to ter is collected, then pumped to a a collection tank (vacuum tank) at capacity to connect 23,000 per- wastewater treatment facility. ii) A the vacuum station. Vacuum sons, is the largest single vacuum vacuum pipeline system, typically station in the world. generators (vacuum pumps) consisting of a branched network of maintain vacuum in the tank and The design of the vacuum sewer- vacuum sewer pipe, and collection sewer pipe. Conventional sewage age system conforms with Euro- chambers with sumps and interface pumps forward collected waste- pean Standard EN 1091 and the valve units. water from the collection tank design guidelines of the German Wastewater flows by gravity from a through a force main to wastewa- Wastewater Association. house/villa into a collection ter treatment plant. chamber’s sump. After a given quantity (batch) of wastewater www.corodex.com SPECIFICATIONS VACUUM STATION VACUUM SEWER LINES Comprise all mechanical and electrical works including pipe- work, vacuum vessel, vacuum pumps, sewage discharge pumps, control panel, odor control equip- ment, ventilation, air conditioning and lighting. Includes four vacuum tanks, sixteen vacuum pumps, six non- clog sewage pumps and two control panels. VACUUM VESSEL Manufactured of steel with inter- Vacuum sewer line with inspection point nal and external epoxy coating. Equipped with lifting lugs and all Collection Chamber Comprised of High Density required process connections. ELECTRICAL CONTROL PANEL Polyethylene pipes (HDPE). Constructed from not less than The operation of all pumps is Pipe diameters- from 90 mm 9mm thick steel plate; thus, it controlled by programmable logic up to 250 mm. provides flanged manhole access controller. of minimum 600mm diameter to Division valves are capable of The vacuum pumps are controlled permit man entry for inspection sustaining a vacuum of 80 by monitoring the vacuum inside and maintenance. KPa. the vacuum vessel with adjust- The minimum vessel capacity is Valves are made from ductile able pressure switches. calculated under consideration of iron with internal & external The sewage pumps are controlled the maximum switch-on- epoxy coating. by capacitive level measurement frequency of the aggregates of 12 in the vacuum vessel Telemetry. to 15 times per hour. VACUUM COLLECTION CHAMBERS SPECIAL FEATURES VACUUM PUMPS Made of PE with a wall thick- Automatic air admission control- Minimum one duty and one ness on the least 6mm. lers used for flushing lines with stand-by vacuum pumps were air are available. Air admission is installed. either controlled by vacuum VACUUM INTERFACE VALVES The pump controls incorporate strength or by a timer. These Minimum size of 75 mm auto and manual duty change- controllers are used to prevent diameter. over facilities. excessive hydrostatic head loss, Capable of passing solids with Operated by pressure switches or to increase flow velocity during a minimum size of 75 mm attached to the vacuum vessel. low flow periods. diameter. Interlocked with an emergency Controllers automatically adjust The interface valves are com- floating switch inside the vacuum the ALR (air to liquid ratio) with plete with controller, rubber vessel to prevent sewage from changing vacuum levels. coupling, plastic tubing, being drawn into the vacuum Designs of sewer pipe profiles is sensor piping connections, pumps. based on flow, line length, and monitoring connections. topography, pipeline material SEWAGE DISCHARGE PUMPS and ground stability. The saw- tooth profile provides excellent CONTROLLERS Minimum one duty and one Open the interface valve only stand-by sewage pumps were if there is a minimum vacuum installed. of 22 kPa available. Suitable for operation under Slide-attached to the valve negative pressure without cavita- body and exchangeable tion. within 1 minute. Pumps are dry pit, centrifugal The air-admission time is impeller type capable of passing adjustable in a wide range (up solids of a minimum shere size 80 to 15 seconds) by turning of a mm diameter. screw or similar method. Controlled by analog capacitive level measurement installed inside the vacuum vessel. Valve www.corodex.com Corodex Electromechanic momentum transfer from air to water. Inspection pipes along vacuum sewers permit manual aera- tion, connection of pressure gauges and isolation by intro- duction of an inflatable ball. No steel, stainless, or metallic component in contact with wastewater or ground water. The atmospheric, passenger load chambers neither need breather lines for ventilation of valves and controllers nor air inlets on the gravity lines. The plastic covers are provided with a locking mechanism with a special key. Flood-proof, heavy traffic chambers are provided with Vacuum Station with Vacuum Tanks plastic covers and cast iron frames and covers on top of rubber couplings and quick unstable pressure conditions. concrete support rings. release clamps, and valves can Vacuum Interface Valves are be exchanged within seconds. Insulation layer of styrofoam activated pneumatically without in the valve chamber protects Vacuum clean-out lance, that is any need of energy or electricity the interface valve unit from attached to the vacuum service at each valve. extreme (hot and cold) tem- connection in the valve chamber, peratures. removes large clogging objects that are retained in the sump. GENERAL ADVANTAGES OF Standard sumps are compact VACUUM SEWERAGE SYSTEM and have a self-cleansing DN 200 diameter gravity drain Construction & Installation shape. lines provide a large, adjustable, self-cleansing and inexpensive Small diameter plastic pipes Collection chamber is compact emergency storage volume. (HDPE) and can easily be carried and installed by two persons. Polyethylene pipes are electro- Shallow & narrow trenching fusion-welded to ensure airtight The sensor pipe is connected Uphill transportation possibility. conditions. to the suction pipe. It is self- No need for manholes or lift cleansed every time the valve Vacuum Interface valves are stations. membrane/diaphragm type which cycles and grease built-up is Easy change of direction, cross- prevented. ensure total closing or complete opening of the valve even under ing over or under obstacles Valves are connected with (flexible pipeline construction). Vacuum sewer may cross water protection areas because exfiltra- tion cannot occur. No need for electrical power at collection chambers. Fast construction, minimal traffic disturbance, and environmental impact. Low construction costs. Control Panel Collection Chamber Operation & Maintenance Minimal environmental impact No line flushing because of Cleaner, safer maintenance self-scouring flow velocity. Eliminates leakages & contamina- No operator contact with tion wastewater. More efficient sewage treatment No exfiltration of wastewater. Easy avoidance of obstructions No infiltration of ground water, Greater freedom in network plan- vacuum sewers are tightness ning tested. No septicity because the A typical Collection Chamber installation outside a villa in Palm Jumeirah wastewater in vacuum sewers is continuously aerated. CHALLENGES SOLUTIONS Pinpoint leak detection. ? Low population density (more than 50 ? Small pipe diameters and shallow Reliable, durable components ft. of sewer pipe length per connected trenches allow cost-effective that are easy to service. household (equivalent dwelling unit = installations for areas with low EDU) & more than 50 EDU’s connected. population density. Low operation & maintenance costs. ? Terrain with insufficient slope for gravity ? Saw-tooth profile allows pipe installation transport (flat terrain) inside shallow trench. ? Obstacles to be crossed ? Obstructions can easily be by-passed. Additional Advantages No natural fall required ? High ground water table ? Vacuum
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