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Category Archives: Water Treatment

Bay Hotel, Camps Bay

A2V in partnership with Conns Water Solutions designed and installed a water treatment plant to treat borehole water containing iron and manganese to drinking water standards for use in the hotel. The water was also stabilized to prevent corrosion to the hotels aging pipe infrastructure.

Iron removal system

 

 

Morester Water Treatment Plant, Saron

A2V carried out an upgrade to the exiting water treatment plant for Quantum Foods at thier Morester Farm. 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
    • supply of the coagulation and settling system including a circular tube settler new dosing equipment and actuated valves for sludge wasting
    • supply and installation sodium hypochlorite dosing system for disinfection.
    • supply of a pH adjustment system

The plant was installed into the existing plant room with minimal disruption to the farm water supply. The existing reservoir and level controls were retained as part of the new system.

Morester WTP

KWV Water Treatment Plant, Paarl

A2V in joint venture with Conns Water and Sopura, designed and installed a water treatment system to remove iron and manganese from borehole water using a catalytic filter media called DMI-65.

The plant is design to treat 25m3/hr using Chlorine dioxide as an oxidant and disinfectant to minimize the risk of chlorine byproduct formation. A pH adjustment is also included in the process to improve the removal efficiency and stabilize the water to prevent corrosion downstream.

This was a fast track project during the water crisis in 2017 and was commissioned within 4 weeks from confirmation of order.

Iron removal system

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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

Ceres Fruit Processors

A2V in joint venture with Conns Water and Sopura, designed and installed a water treatment system to remove iron and manganese from borehole water using a catalytic filter media called DMI-65.

The plant is design to treat 40m3/hr fed directly directly from the borehole pumps via the system to a reservoir. Chlorine dioxide, produced by a generator on site, is used as the preferred oxidant and disinfectant to minimize the risk of chlorine byproduct formation. In line pH adjustment is critical for optimum manganese removal.

This was a turnkey project including civil and building works.

Chlorine dioxide dosed into a mixing pipe prior to filtration by DMI-65

Chlorine dioxide dosed into a mixing pipe prior to filtration by DMI-65

DMI-65 filters

DMI-65 filters

Iron Removal for Domestic Boreholes

In response to numerous requests from borehole owners, we have developed a low cost system for removing iron from water in domestic applications.

Our system uses chlorine as an oxidise iron and manganese in the water prior to passing it through a specialized catalytic filter media (DMI-65) which promotes the oxidation of iron, causing it to precipitate out into he media bed. The iron particles are then back washed from the filter in the same way as a pool filter is back washed. DMI-65 is highly effective and is unique in that it does not require regeneration, unlike many other iron removal medias on the market. Indeed, the media has a life span of up to 10 years if operated correctly, making electricity the only operating cost of the system.

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Chlorine is dosed as Calcium hypochlorite in slow release tablets through an in-line dosing system. This has the advantage maintaining a residual concentration in the water downstream, thereby disinfecting it and preventing re-infection.

Our system is available in two sizes 300LPH and 500LPH and can be supplied with an automatic or manual filter head.

For more information please visit our on-line store.

 

 

Mosstrich Abbattoir Water Treatment, De Aar

Mosstich Abbattoir Water Treatment Plant, De Aar,

The Mosstrich abbattoir in De Aar inthe Northern Cape utilizes the municipal water supply for all of its operations. However, the water has a hardness >350ppm and is also known to be shown bacterial contamination on occasion.

A2V were appointed to design a water treatment plant that would achieve the standards required by the National Directorate of Veterinary Services. The system implemented comprised the following processes:

  • Zeolite filtration remove particulates down to 5um
  • GAC filtration to remove possible organic contaminants such as pesticides
  • Ion exchange softening to reduce hardness to less than 10ppm
  • Disinfection by means on on site chlorine dioxide generator
  • Booster pump installation to supply water to the abbattoir

Zeolite filter, GAC filter and softener

Chlorine dioxide generator and dosing station

Sugarbird Manor Water Treatment

Sugarbird Manor Guesthouse

The Sugarbird Manor Guesthouse and a number of residences on the Protea Heights farm all utilize water from two boreholes on the site. The water is exceptionally pure with the result that it is highly corrosive. This was leading the usual problems associated with corrosive water in domestic applications, namely:

  • burst geysers
  • laundry staining
  • staining of sanitary ware
  • pipe bursts

A2V designed and installed a limestone contact tank on the rising main from the borehole pumps to the main reservoir which resolved the problems previously experienced.  Partial stabilization of corrosive water with limestone has been shown be the CSIR to be a low maintenance and cost effective method of reducing corrosion in plumbing systems.

A2V also implemented a disinfection program at the main reservoir to ensure that any bacterial contamination of the groundwater would be neutralized. This was achieved by using slow release Calcium hypochlorite tablets in a floating dispenser.

Limestone contact tank for partial stabilisation of corrosive ground water

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