New Zealand is well known for its wines and its environmental management. The upgrade of a Marlborough winery wastewater treatment system included a new 15 mega litre, covered anaerobic lagoon for buffer storage of untreated winery wastewater, and a 15 mega litre ,uncovered storage lagoon for treated winery wastewater.
MARLBOROUGH WINERY WASTEWATER MANAGEMENT
Viking Containment was responsible for the design and supply of the liners and biogas collection floating cover for this Marlborough winery. Phil Bennett of Geotest Australia designed a “Tension Plate” floating cover system to accommodate the fluctuating levels of the lagoon. The design also included a biogas collection system beneath the cover and a stormwater dewatering system on top of the cover.
The cover material was Flexishield Reinforced Polypropylene (RPP) geomembrane.
Cover panels were fabricated in Viking Containment‘s facility to predetermined dimensions and included attachment straps and float wrap sleeves to minimise onsite seaming.
The cover was installed with floats and ballast tubes in the correct geometry to maintain a tensioned cover. This tension eliminates slack in the cover at all levels of operation and provides effective drainage of stormwater from the top of the cover to the formed sumps. A central platform houses a submersible pump for dewatering the stormwater.
Platforms, walkways and floats were constructed on site using closed cell polyethylene foam encapsulated in Flexishield polypropylene.
Gas relief valves were installed in eight locations on the cover as a precaution in case of extraction failure or unexpected gas build up over inflating the cover.
Sampling ports were also incorporated into the cover to allow regular inspection, sampling and testing.
All factory panels and onsite seaming was air pressure tested to ensure the cover was gas tight. For the cover perimeter a mechanical batten bar and rubber gasket system sealed the cover to a concrete ring beam.
PROJECT PERFORMANCE
The project completion date was critical to the operations of the winery as processing of the pending harvest required the new storage capacity. We had a setback with material shipment delays which put our programme behind however the prefabrication of all the cover panels and foam sleeves allowed us to expedite this phase of the installation making up some of the lost time. The cover installation was completed in 10 days.
The liners and floating cover are performing very well and have met all the design and Quality Control and Assurance requirements.
PROJECT DETAILS
Application: Liner and Floating Cover for Odor Control
Geosynthetics: 1.14mm Flexishield Reinforced Polypropylene (Cover); 2.0mm Geoshield HDPE Smooth (Liner); Texshield 500gsm Nonwoven Geotextile
Designer: Phil Bennett
Contractor: Viking Containment
