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D·E·K·K·E·R E·N·V·I·R·O·T·E·C·H

D·E·K·K·E·R E·N·V·I·R·O·T·E·C·H. Passive treatment of agro-industrial wastewater to meet stringent environmental and reuse requirements Len Dekker and Mynhardt Theron. Wastewater characteristics. Conceptual design. Rotary screen. Settling tanks. Raw tomato wastewater.

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D·E·K·K·E·R E·N·V·I·R·O·T·E·C·H

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  1. D·E·K·K·E·R E·N·V·I·R·O·T·E·C·H Passive treatment of agro-industrial wastewater to meet stringent environmental and reuse requirementsLen Dekker and Mynhardt Theron

  2. Wastewater characteristics

  3. Conceptual design Rotary screen Settling tanks Raw tomato wastewater Recycle for pH control Venturi aerators ANAEROBIC POND FACULTATIVE POND ALGAL STABILISATION PONDS CONSTRUCTED WETLAND Sludge & alkalinity recycle Sand filtration 60% reuse by factory Chlorine dioxide 40% river discharge

  4. Rotary screen Settling tanks

  5. Anaerobic Pond

  6. Facultative Pond

  7. pump venturi

  8. Algal Stabilisation Ponds

  9. Algal biomass on surface

  10. Constructed wetland divided into 4 cells

  11. Operating details and cost per annum Electricity: 60 kWh Labour: 1 semi-skilled operator Chemicals: R20,000 per annum (Lime dosing during start-up) Sludge removal: no secondary sludge Maintenance: R50,000 per annum Operational complexity: conventional pumps utilised no complex PLC-controls Capital cost: R8 million (20% less than conventional system)

  12. Benefits SLUDGE-FREE SYSTEM low maintenance + easy operation = SUSTAINABILITY Treatment components based on proven technology Effective water reuse not dependant on high-tech

  13. Project Team Consultants: Dr. Len Dekker Mynhardt Theron Engineers: SKCM consulting engineers ldekker@mweb.co.za083 309 7056

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