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Category Archives: Water Resource Management

Indigo Brands Water Security

In response to the recent water crisis in Cape Town, A2V were requested to assist in identifying a solution to ensure Indigo’s water supply in the event of disruption to supply. in addition, the City’s pressure management programme has also reduce supply pressure to the point where parts of  Indigo’s facility were no longer receiving water.

The study included test well points, sampling and evaluation of ground water quality through to treatment and recycling of effluent. The solution implemented included a 600kL reservoir fed by municipal water and booster pumps to feed it into the factory and offices. The intention being that in future the municipal supply can be supplemented with treated rainwater, groundwater or effluent. A2V for responsible for the implementation and project management as well.

 

Booster pumps and reservoir at Indigo Brands

Booster pumps and reservoir at Indigo Brands

Pelmanco Recylcing Effluent Treatment Plant

Pelmanco Recycling recover plastic from landfill sites which they then recycle into raw plastic materials. The recovered plastics are washed before they are fed into the recycling process. This washing process was using a substantial amount of water. Furthermore, Pelmanco were being penalised by the City of Cape Town for discharging effluent that did not comply with its bylaws.

A2V were appointed to design a system that would clean the water to a level where it could be reused to wash more recovered plastic before being discharged to sewer.

The system implemented comprises the following key elements:

  • Screening to remove coarse solids from the effluent
  • Coagulant dosing equipment
  • A Tube Settler to remove flocculated particles
  • Sand filtration to remove any particles carried over from the settling process

The project successfully reduced the wash water consumption by 70%, a significant saving on Pelmanco’s operational costs. Screened solids are now removed to landfill and the council is satisfied that the settled sludge can be discharge directly to sewer.

Pelmanco's mechanical screen

The flocculator and tube settler at Pelmanco.

Albion Chemicals (Pty) Ltd – Factory Upgrade

Albion Chemicals' Bulk Storage Facility

Albion Chemicals (Pty) Ltd appointed A2V as Project Managers and Engineers for the upgrade to their facility in Paarden Eiland. The project included the following:

–          A new flammable products store for Acetone, Benzine, Turpentine, Methylated Spirits and Thinners. The store included ventilation and foam injection systems design.

–          A new emergency bund facility and increased storage capacity for Sodium hypochlorite and Hydrochloric Acid.

–          Improved loading area drainage and installation of an emergency pump sump and all of the associated pumping equipment.

–          A new bottling facility with improved safety features and process control.

–          Construction of a new workshop and change rooms.

–          A new Fire Protection System and upgraded security system .

A2V were responsible for every aspect of the project from inception:

–          Planning permission and approvals

–          Design and drawings

–          Specification and tenders

–          Appointment, co-ordination and supervision of contractors

–          Final Certifications

 

The facility upgrade was carried out with the factory in full production, requiring careful planning and co-ordination of activities. It was commissioned in August 2013.

Klein Constantia Wine Estate Water Treatment Plant

Klein Constantia Wine Estate is located  on the slopes of Table Mountain and within the City of Cape Town. A2V were approached for a proposal that would ensure a cost effective and reliable potable water supply to the cellar and the various residences on the estate.

A2V presented a proposal for treating water from the two storage dams on site to SANS 241-1 (2011) versus connecting to the City’s potable water supply network. Klein Constantia opted for the more sustainable approach of operating their own water treatment plant to treat the stream run-off from the mountain. It would also prove to be a more economical solution in the long term.

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Royal Cape Golf Club Irrigation

The Royal Cape Golf Club (RCGC) experienced water shortages during years with below average rainfall, which led to a deterioration in the course condition. Various alternatives for augmenting the irrigation resources have been considered over the years, but a suitable solution had never been implemented.

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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!