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Tag Archives: water treatment

Albion Chemicals – Iron Removal Plant

Albion Chemicals are manufacturers of of bleach and other cleaning products. Cape Town municipal water is used as the main ingredient for all of their products.

Albion were experiencing a high number of returns on their products due to ‘blow-outs’ of the product bottles. A number of water and product samples determined that the most likely cause for the ‘blow-outs’ was the presence of iron in the make-up water. Indeed, iron levels in the municipal supply were found at times to exceed 2mg/L and the SABS standard for drinking water.

The City of Cape Town uses ferric chloride as a coagulant on many of its water treatment plants. At times the process is not managed correctly and either excess ferric chloride is present in the water; or flocs are carried over from the settling process into the reticulation system.

A2V designed a filter system using a specialized catalytic media, designed for the removal of iron and manganese. The media  acts as an oxidation catalyst causing the metals to precipitate within the media bed,consistently removed iron to <0.01ppm.  It is also effective at removing arsenic, aluminium and other heavy metals.

The catalytic media uses an oxidation, adsorption and filtration process similar to Greensand and Birm, but to a much higher removal efficiency and significantly lower life cycle cost. The media lasts for 5 to 10 years and does not require regeneration. The entire process is simpler to operate and less costly to install than traditional iron removal systems.

Iron removal filters using catalytic media

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…)

Ekango Salt Dust Extraction System

The salt field operation at Walvis Bay, Namibia, was established in 1964 and is one of the largest solar evaporation facilities in Africa, producing 730,000 tonnes of salt per annum. (more…)

Volatile Organic Vapour Condenser

The Volatile Organic Vapour Condenser (VOVC) was developed for removing condensable organic compounds from factory emissions. (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!

Water Regenerable Carbon

This patented non-impregnated catalytic carbon was designed specifically for odour control in wastewater applications where the main pollutants are hydrogen sulphide and mercaptans. It is unique in that it has a high capacity for sulphide removal without the need for chemical impregnants. (more…)