4.5 m3/hr RO and 1 m3/hr Softening plant
Nampak is Africa’s leading diversified packaging manufacturer, and has been listed on the JSE Limited (Johannesburg Stock Exchange) for 48 years. The company operates from 28 sites in South Africa. It is comprised of various divisions namely paper, plastics, metals, glass, Inspections and coding solutions as well as research and development. One of the company’s goals is to accelerate their growth in Africa.
Nampak glass uses water for their cooling as well as for other processes involved in their energy intensive glass manufacturing process. The water is supplied by Rand water. Nampak requires a water treatment system that is going to treat the municipal water to meet their process requirements and further improve the efficiency of downstream processes. They require a softening system with a capacity of 1 m3/ hr and a Reverse Osmosis system with a capacity of 4.5 m3/ hr.
Based on the process water requirements and the analysis of the municipal water. The Watericon engineers designed a water treatment Plant consisting of a softening system and an RO system with the previously stated capacities. The Softening process was responsible for the removal of hardness, alkalinity and carbonates.
Two small filter units were fitted to remove remaining particles just before the RO system to protect the RO membranes. Anti-scalent and chlorine removal chemicals were dosed before the RO membranes. After the RO treatment, there was also a disinfection system in place.
The water treatment plant consisted of the following:
- Softening system
- Dosing systems for chemical make-up/addition – anti-scalent dosing
- RO system
For the softening process with capacity of 1 m3/hr, the feed is supplied directly from the municipality. It is then pumped to the Softener which uses an ion exchange resin to reduce the hardness, before the water is pumped into the softened water storage tank, there is disinfection of the water.
The reverse osmosis process receives its feed water from the municipality and it is passed through small filter units as part of pre-treatment. The water is then sent to an RO feed water storage tank from the tank the water is pumped using the RO high pressure pump, along the way, chlorine removal takes place to protect the RO membranes as well as the dosing of anti-scalent. The water is then sent to the RO membranes. After the RO membranes, there is disinfection just before the water is sent for storage in the RO water storage tank.