Baffle Curtains and Turbidity Barriers

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Baffle curtains are used in waste water treatment reservoirs to improve the operating efficiency of WWTP systems. Baffle curtains minimise short circulating of water in the reservoir, increasing the retention time and thus optimising the reservoirs volume.

Applications

  • Waste Water Treatment Plant (WWTP) lagoons
  • Turbidity Barriers
  • Debris Barriers
  • Silt Curtains

Permathene custom manufactures these in the Auckland factory. Using materials which are designed to last for many years, including Permaliner Flexible Polypropylene and Permaflex Flexibible Polyethylene for the baffle skirts and floatation, stainless steel fittings.


Projects Completed

  • Lagoon Barrier, Beachlands-Maraetai, Manukau City, New Zealand. Contract Completion September 2000. Contract’s Scope: 60 m long lagoon barrier fabricated from 1 mm Permaliner (Flexible Polyethylene) was installed into existing lagoon to separate it into two different biological process sections.
  • STP Suspended Curtains, Waste Water Treatment Plant, Te Awamutu, New Zealand. Contract Completion August 2002. Contract’s Scope: One 65 m long 4.5 m deep baffle with 110 mm Ø floatation was installed along the center line of the pond, with 5 short 13.5 m long 4.5 m deep curtains attached perpendicular to it. Total system’s length was 132.5 m. The curtains were fabricated from Permaliner 1000 (1 mm).
  • Silt Control Curtain - Marine construction, Waiheke Island, Auckland, New Zealand. Contract Completion August 2004. Contract’s Scope: This was one of the first projects in New Zealand where a dedicated floating silt screen had actually been specified. 180 m long 4 m deep screen had 300 mm buoyancy element sealed in a PVC sleeve. Silt control skirt was fabricated from monofilament woven geotextile, complying with flow ration and opening size specified for the project.
  • Turbidity Barrier, Waikuku Beach STP, Waimakariri District, South Island, New Zealand. Contract Completion September 2005. Contract’s Scope: Two 40 m long, 1.5 m deep baffles (80 m total) were fabricated from Permaliner 750. 150 mm marine grade polystyrene was weld-sealed inside buoyancy tube, fabricated from FPP. The material specified for the lining of this pond was 1.5 mm Smooth HDPE geomembrane. A total of 4,446 m² was used on the job, and the project was completed in 6 days. The 7 m wide panels were fusion welded together on site, and all welds and seams were tested by destructive methods.
  • Stormwater Retention Bunker Baffles, NZFS Training Facility, Eastgate, Rotorua, New Zealand. Contract Completion October 2005. Contract’s Scope: Five baffles, fabricated from FPP Permaliner 750, 6.5 m long and 2.2 m deep each (32.5 m total) were fabricated and installed in New Zealand Fire Services Training Facilities in Eastgate, Rotorua for separation of suspended solids and hydrocarbons from stromwater runoff.
  • Coal Stockpile Sediment Control Baffles, Waikato Water Reservoir, Lyttelton, New Zealand. Contract Completion February 2006. Contract’s Scope: Two floating silt barriers, 16 m and 14 m long, 1.3 m deep were fabricated to control sediments from stormwater runoff at Lyttelton Port Company’s coal stockpile. Buoyancy elements, fabricated from 150 mm marine grade polystyrene, were enclosed in Permaliner 750 tube. The baffles had skirt, made from high-flow ratio non-woven geotextile, with extreme small opening size, to catch small coal particles from stormwater runoff.
  • Turbidity Barrier, Baffle Curtain, Taihape WWTP, Taihape, New Zealand. Contract Completion June 2007. A single stub baffle curtain, 30 m long, 2 m deep, fabricated from Permaliner 750, was fabricated and installed at oxidation pond at Taihape WWTP.
  • Turbidity Barrier, Baffle Curtain, Marton WWTP, Marton, New Zealand. Contract Completion June 2007. Contract’s Scope: A single stub baffle curtain, 30 m long, 3.2 m deep, fabricated from Permaliner 750, was fabricated and installed at oxidation pond at Marton WWTP.
  • Turbidity Barrier, Baffle Curtain, Cromwell WWTP, Cromwell, Otago, New Zealand. Contract Completion November 2008. Contract’s Scope: A single 100 m long, 1.3 m deep baffle curtain, fabricated from Permaliner 750 was fabricated and installed at Cromwell WWTP. The baffle had 150 mm floating element, made from marine grade polystyrene, weld-sealed inside low density polyethylene tube and inserted in weld-sealed buoyancy element, fabricated from Permaliner 750. Cross-anchors (side anchors) installed from both sides of the baffle curtains every 20 m.
  • Turbidity Barrier, Baffle Curtain, Wallan STP, Victoria, Australia. Contract Completion November 2008. Contract’s Scope: supply and installation of three 90 m long 4 m deep baffle curtains (total of 270 m), fabricated from Permaliner 1000 (1 mm FPP).
  • Turbidity Barrier, Baffle Curtain, Appin West, NSW, Australia. Contract Completion March 2009. Contract’s Scope: Supply single 30 m long 2.6 m deep baffle curtain, fabricated from Permaliner 1000 (FPP 1 mm).
  • Turbidity Barrier, Baffle Curtain, Kaitaia WWTP. Contract Completion November 2009. Contract’s Scope: 642 m of 1.7 m deep baffle curtains. 8 baffle curtains were fabricated and installed in 3 ponds. Baffle’s individual lengths were 126 (three baffles), 77 m (two baffles), 60 m (One), 20 m stub baffle curtains (Two). The baffles were fabricated from Permaliner 750. Floating elements were completed from 150 mm marine grade polystyrene logs, sealed inside low density PE tube, and then inside 750 FPP buoyancy elements. This baffle curtain system was fabricated with double ballast system. Heavy 16 mm galvanized chain (5.5 kg/m) was placed in pre-welded seam 1 m below surface, and then 13 mm chain (4.4 kg/m) along the skirt’s low part. Additional ballast was required due to complex wind environment of the WWTP location, with winds reaching up to 100 km/h speed at times. The baffles were installed with cross-anchors at 15 m intervals. The second stage of the project was completed in time and at the projected cost.
  • Turbidity Barrier, Baffle Curtain, Ngaruawahia WWTP Ngaruawahia, Waikato, New Zealand. Contract Completion September 2009. Contract’s Scope: 787 m baffle curtain system, consisting of 6 baffles was used to create an extended flow path through the pond and to separate the pond into a facultative and four maturation zones. The system had complex “T” and “X” baffle connections, required complicated fabrication.
  • Huntly WWTP Upgrade, Huntly, Waikato, New Zealand. Contract Completion October 2009. Contract’s Scope: Two baffle curtains, 221 m and 223 m long (444 m long total) were installed in the pond aiming creation of an extended flow path through the pond. Five new floating curtains total length of 805 m were fabricated from Permaliner 1000 and installed into the treatment pond. The purpose of the installation was to create an extended flow path through the pond and to separate the pond into a facultative and four maturation zones.
  • Matamata WWTP Upgrade, Matamata, Waikato, New Zealand. Contract Completion October 2011. Contract’s Scope: Four baffle curtains 895m long total were installed in two ponds for an increased flow path throughout.
  • Otorohanga WWTP Upgrade, Otorohanga, New Zealand. Contract Completion May 2012. Contract’s Scope: Three baffle curtains 406m long total were installed for an increased flow path.
  • Helensville WWTP Upgrade, Helensville, New Zealand. Contract Completion July 2012. The supply and installation of 170m of baffle curtains.
  • Longford WWTP Upgrade, Tasmania, Australia. Fabrication Completion July 2012. Contract’s Scope: 5 baffle curtains 505m long total were installed for increased flow paths.
  • Cradle Mountain WWTP Upgrade, Tasmania, Australia. Fabrication Completion November 2012. Contract’s Scope: A baffle curtain 60m long total was installed to increase the flow path.
  • Te Kuiti WWTP Upgrade, Te Kuiti New Zealand. Fabrication Completion May 2013. Contract’s Scope: A 70m x 3.65m circular floating Anaerobic Zone curtain was installed in an Activated Sludge Reactor.
  • Woodville WWTP Upgrade, Tararua DC New Zealand. Fabrication Completion November 2013. Contract’s Scope: 120m of baffle curtain installed to increase the flow path.
  • Waitomo Village WWTP Upgrade, Waitomo New Zealand. Fabrication Completion November 2013. Contract’s Scope: A 44m x L Shaped floating curtain was installed in order to create a longer flow path.
  • Drouin WWTP Upgrade, Australia. Fabrication Completion November 2013. Contract’s Scope: A 140m floating baffle curtain was installed to delay the inlet flow before releasing the wastewater to the anoxec part of the lagoon.
  • Iluka Resources, South Australia. Fabrication Completion January 2014. Contract’s Scope: 3 baffle curtains 18m each were supplied for installation in a settling pond at a mining plant in order to allow floating precipitate to settle before reaching the overflow pipe.
  • Gippsland WWTP Upgrade, Victoria, Australia. Fabrication Completion July 2014. Contract’s Scope: A 350m long baffle curtain was supplied for installation at a WWTP plant.

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