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Spruitdrift Primary School WTP, Vredenberg

A2V in partnership with Conns Water Solutions designed and installed a plant for treating canal water to potable standard for the learners and teachers.

The plant comprises the following elements:

  • in-line dosing of coagulant into a pipe flocculator;
  • iron and heavy metal removal by DMI-65 filtration;
  • fine particulate filtration through zeolite filter media and;
  • liquid chlorine (sodium hypochlortie) disinfectant dosing.

Spruitdrift PS WTP

Grootvadersbosch Nature Reserve

A2V in joint venture with Flowline carried out an upgrade to the exiting water treatment plant for Cape Nature Conservation. The project included an analysis of the existing system which had fallen out of use and recommendations on its upgrade. The project comprised the following:

  • supply of a duplex zeolite filter system with automated backwash
  • automation of the coagulation and settling system including new dosing equipment and actuated valves for sludge wasting
  • supply and installation of a simplified Calcium hypochlorite dosing system for disinfection.
  • a larger buffer tank for improved filter backwash
The concrete reservoir with an in-line HTH dosing system and the treatment plant behind

The concrete reservoir with an in-line HTH dosing system and the treatment plant behind

The flocculation column, settling tank and buffer tank in a beautiful wilderness

The flocculation column, settling tank and buffer tank in a beautiful wilderness

Amawandle Pelagic

A2V in a joint venture with Conns Water designed and supplied a sea water treatment plant at their facility in Veldrif. The treatment plant designed to treat 40m3/hr includes a coagulation and settling stage followed by filtration and disinfection. The treated water is used in the factory to reduce their dependence on municipal water.

The coagulation system includes a pipe flocculator ahead of two polyethylene tube settlers. The filtration system includes three FRP (fiber reinforced plastic) filter vessels with PVC pipework and customized backwash valves, all compatible with sea water. Disinfection is achieved by controlled dosage of Sodium hypochlorite.

Pipe flocculator and tube settlers

Pipe flocculator and tube settlers

FRP filter with customized Bermad backflush valves and zeolite fine filtration media

FRP filter with customized Bermad backflush valves and zeolite fine filtration media

Polyethylene tube settler with 35mm aperture, UV stablilsed tube modules

Polyethylene tube settler with 35mm aperture, UV stablilsed tube modules

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

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

Protea Chemicals – New Chlorine Store

A2V were appointed to carry out the mechanical ventilation design for the new chlorine gas storage facility at Protea Chemicals. This included modifying the existing chlorine scrubber system so that it could serve the new storage facility as well as the existing facility.

The ventilation system was designed to ensure early detection of  leaks with chlorine sensors situated at low points in the collection zone. The sensors activate the emergency extraction and scrubbing system and close the exits in the event of a tank rupture. The floor of the storage area is designed to be effectively ‘swept’ by even extraction via a low level extraction manifold located along one side of the facility.

A2V also carried out the Fire Prevention Plan for the new facility which was commissioned in September 2013.

Emergency Chlorine Scrubber

 

 

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…)