Pulp and Paper

Pulp and paper mills produce large volumes of wastewater and residual sludge waste. WEC Projects has the expertise in the treatment of pulp and paper wastewater, discharge, and sludge disposal to reduce production costs, save water and improve the environment

Effective Pulp and Paper Turnkey Solutions

Papermaking is a specialised process in which high volumes of water are used in pulp preparation and the bleaching processes.  Water is used to produce paper pulp out of fibres such as cellulose, wood or recycled paper. These processes produce a large amount of contaminated wastewater and sludge. In addition to the actual papermaking process, there are also supporting areas such as recovery boiler operation and steam production.

WEC Projects is committed to assist these specialised clients in saving water and closing water circuits to substantially reduce any environmental impact by process modelling and internal process water treatment.

Principal methods used to remove solids from pulp and paper mills effluents are screening, settling/clarification and dissolved air flotation. The method chosen depends on the characteristics of the solid matter to be removed and the requirements placed on the purity of the treated water.

WEC Projects have a full range of technologies for treating boiler feed water:

  • Ion exchange resins
  • Ion exchange mixed bed polishing units
  • Reverse osmosis
  • Continuous Electro-deionization (CEDI)

With its strong track record in Biogas to Energy projects in South Africa, WEC Projects utilises advanced anaerobic treatment technology for treating high concentration organic wastewaters produced by pulp and paper production facilities.   The biogas produced during the anaerobic digestion process is then combusted in combined heat and power (CHP) plants to generate electricity.   In this way clients can reduce their overall carbon footprint.

Aerobic biological technologies may also be used for the treatment of pulp and paper wastewaters.   WEC Projects have specialist knowledge in conventional activated sludge treatment, as well as advanced membrane bioreactor (MBR) and mixed bed bio-reactor (MBBR) technologies. 

Principal methods used to remove solids from pulp and paper mills effluents are screening, settling/clarification and dissolved air flotation. The method chosen depends on the characteristics of the solid matter to be removed and the requirements placed on the purity of the treated water.

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