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Monthly Archives: March 2015

Premier Hotel Cape Manor

A2V were appointed has Wet Services Engineer for an extension to the existing hotel.

The refurbished Wingate building soon after opening

The project comprised the following design elements:

  • Sewage drainage
  • Stormwater drainage
  • Hot and cold water reticulation
  • Centralised hot-water system (heat pumps)

 

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.

Three Streams Smokehouse Effluent Treatment Plant

A2V were appointed to refurbish the existing effluent treatment plant.

Our investigation confirmed that the original design was satisfactory for the current effluent flows, but that the aeration system needed to be replaced. This was done in a phased approach with minimal disruption to the operation of the plant.

The new aeration system has improved the oxygen transfer capacity of the plant which has been performing better that ever since being recommissioned.

Newly disc diffuser aeration system

Mont Rochelle Water Treatment Plant

Mont Rochelle Hotel and Winery

A2V designed, supplied and installed a water treatment plant to treat borehole water from two existing boreholes on the site to potable standards.

The system uses a specialized filter media (DMI65) to remove oxidised iron and other metals from the water. Chlorine dioxide is used as the oxidant and disinfectant of choice due to there being no risk of the formation of chlorine byproducts (TCAs) which could affect the wine negatively.

The existing infrastructure was reused as far as possible in order to keep the cost of the system to a minimum. The plant was commissioned in November 2014.

 

Mont Rochelle Water Treatment Plant

Mont Rochelle Effluent Treatment Plant

Mont Rochelle, Franschhoek

A2V were appointed to identify the most cost effective means for treating and disposing of Mont Rochelle’s cellar effluent. The existing system comprised a conservancy tank which discharged into the vineyard.

A2V determined that pretreatment and discharge of the effluent to municipal sewer would be the most economical and lowest environmental impact solution to implement. The nearest municipal sewer was found to be located 320m from the cellar and the effluent would be able to drain under gravity.

A2V design a treatment plant that would pretreat  the effluent to a standard compliant with the Stellenbosch Municipality Industrial Effluent Discharge Bylaws for a number of parameters:

  • Suspended solids / Settleble solids
  • pH

The plant included the following key elements:

  • A new basket screen to remove coarse solids from the effluent;
  • A new underground settling tank and;
  • Dosing equipment to adjust the pH to within acceptable limits.

A2V were also responsible for the design and supervision of the construction of the new sewer to drain sewage and effluent from the following sources on the site:

  • the upgraded cellar
  • the restaurant kitchen
  • the restaurant restroom facilities
  • seven laborers houses

The plant and sewer network was commissioned in January 2015  in time for the 2015 harvest.

Mont Rochelle Effluent Treatment Plant

Klein Constantia Effluent Treatment Plant

A2V were appointed to identify the most cost effective means for treating and disposing of Klein Constantia’s cellar effluent.

The existing system comprised a settling tank which discharged to the municipal sewer, however the effluent did not comply with the City of Cape Town’s effluent discharge bylaws for a number of parameters:

  • Suspended solids
  • pH
  • Chemicals Oxygen Demand (COD)

A2V determined that discharging to municipal sewer would be the most economical and lowest environmental impact solution to implement. A new plant was designed that incorporated the existing infrastructure as far as possible so as to keep the cost of the project to a minimum. The plant included the following key elements:

  • A new auger screen to remove coarse solids from the effluent.
  • Dosing equipment to adjust the pH to within acceptable limits.
  • A new lift pump to lift the effluent to the settling tank.
  • An upgraded settling tank to improve settling performance.

The plant was commissioned in August 2014 and the City of Cape Town issued a Discharge Performance 6 months later after evaluating the plant’s performance.

Channel Auger Screen at Klein Constantia