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L’Ormarins Water Treatment Plant

A2V were appointed by Rupert Wines to investigate an alternative water supply for use in the cellars and for potable use in the estate residences.  (more…)

Perdeberg Winery Water Treatment Plant

Perdeberg Winery appointed A2V to design and supply a water treatment plant to treat water from the winery’s storage dam to SANS 0241: Class 1 for drinking water.

The dam water comprises mainly water from the Berg River Irrigation Scheme and  is supplemented with rainwater and borehole water during the wetter winter months.

A2V proposed a system comprising the following key elements:
•    coagulent dosing (Ultrafloc U3800)and settlement to remove the majority of suspended particuates (turbidity), dissolved organic carbon (DOC) and color.
•    alkalinity adjustment to reduce the treated water’s corrosive potential.
•    sand filtration
•    carbon filtration to remove any remaining DOC and odors
•    disinfection by chlorine dioxide

The inlet buffer tank and chemical make-up tanks and filter shelter.

Chlorine dioxide was recommended for disinfection over other disinfectants for a number of reasons:

•    No formation of chlorinated byproducts as a result of disinfection and no free chlorine, chlorate or chlorite residuals in the treated water.

•    Current literature reports that chlorine dioxide does not produce any chlorophenols – the precursor to TCA  (trichloroanisole) formation.

•    Effective for the control of biofilm as there is no resistance building from microorganisms
•    No pH limitations on disinfection capability.
•    Its disinfectant (sterilisation) capabilities are not diminished at all in the presence of fats, oils, proteins, body fluids etc. because it has very selective and very few chemical reactions.
•    It is highly soluble in water, therefore, it has a long-lasting residual which reduces the potential for cross infection or re-contamination.

•    It is a broad spectrum, fast acting disinfectant, effective against a wide range of bacteria, spores, fungi, and viruses at relatively low concentrations and short contact period.
•    It is colorless, has a mild medicinal odour, low corrosivity to metals and the lowest acute toxicity rating from the EPA.
•    High efficacy against E.coli, salmonella, listeria, aspergillus, penicillium, staphylococcus etc.
•    The generator and dosing equiment are reliable and easy to maintain.

The chlorine dioxide generator and precursor soltuions

The plant was designed to supply 20 m3/hour of treated water with sufficient storage capacity to meet the cellar’s peak water demand of 500m3/day during the harvest season.

The plant was commissioned in August 2011, 7 weeks after the order was placed!