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Green Drop Compliance in Johannesburg
Etienne Hugo
General Manager: Operations
Johannesburg Water (Pty) Ltd
Presentation
• Introduction to Johannesburg Water.
• Objectives of sewage treatment.
• Factors affecting “green drop” compliance.
• Consulting Engineers appointments.
• Process Controllers and Maintenance.
• Capital and Operational expenditure.
• Conclusions.
Johannesburg Water (Pty) Ltd
• Johannesburg Water (JW) was established in January 2001 by City of Johannesburg for the delivery of water and sanitation services.
• JW manages, operates and maintains 6 wastewater treatment works.
• In 2009, the works produced 260 dry tons of sludge per day.
(1550 m3 / day at 17% dry solids concentration)
Treatment Works
Objectives of Sewage Treatment
• To produce an effluent quality that fully complies with the licence conditions at all times.
• To treat and dispose of sludge in compliance with the 2006 “Guidelines for the utilization and disposal of wastewater sludge”.
• To ensure that the above operations are cost effective, affordable and sustainable.
• To maintain safe and healthy working conditions.
• To prevent raw sewage overflows from entering streams and rivers. .
Green Drop Compliance
Factors affecting “green drop” compliance
• Appointment of consultants.
• Process Controllers.
• Maintenance.
• Opex and Capex.
• Conclusions.
Consulting Engineers
Consulting Enginners requirements:
• Experience in designing for your licence conditions.
• Experience in designing for local conditions.
• Implementation of successful designs under the above conditions.
Consultant / Client
• Assess clients experience with various processes.
• List available processes that attain required results.
• Input from client / operational staff on process selection.
• Implement successful designs.
• Select proven mechanical equipment.
• Keep the whole process simple.
• Are existing staff able to operate and maintain the proposed design?
Process Controllers
All treatment processes require some level of technology:
• Education must meet level of technology selected.
• Process controllers must be committed to attainment of objectives.
• Train in-house and only for needs.
• Give opportunity to develop skills.
Maintenance
• Implement a simple but effective maintenance programme.
• Outsource repairs to agents.
Capital Expenditure
Capex used for new, replacement or major refurbishment of equipment.
• Require a five year plan for the above.
• Five year plan split into annual capital expenditure.
Operational Expenditure
Targets must be set for high cost areas such as power and chemical consumption, salaries etc.
• Annual operational budget developed from previous years performance.
• Consider cost increases for power, chemicals, salaries etc.
• Carefully monitor expenditure.
Conclusions
• Carefully select consultants and ensure clients input into decisions made.
• Education, commitment, specific training and opportunity to develop cannot be substituted one for the other.
• Implementation of a simple maintenance programme is essential.
• Repairs to mechanical plant should be undertaken by the agents.
• Sufficient Capex and Opex must be made available for successful operational and maintenance performance.
THANK YOU FOR YOUR ATTENTION.