Aug 24, 2012
Construction on new Durban waste transfer system under wayBack
Construction|DURBAN|Engineering|Harbour|Africa|Aveng Construction|Building|Concrete|Contractor|Conveyors|Design|Diesel|Education|Environment|Industrial|Jeffares & Green|Lighting|PROJECT|Road|Roads|SECURITY|Storage|Sustainable|System|Systems|Testing|Training|Waste|Waste Management|Water|Africa|Germany|South Africa|Electron Road Facility|Plant Rescue|Bulk Transportation|Energy|Equipment|Landfill Site|Maintenance|Mechanical Equipment|Oil Traps|Road Systems|Shorter Transportation Distance|Solutions|Systems|Weighbridge Infrastructure|Umgeni River|Environmental|Brad Wyatt|Infrastructure|Richard Winn|Waste|Water|Operations|Biodiversity Protocol|Diesel |Pollution Control
© Reuse this
The eThekwini municipality’s cleansing and solid waste unit, Durban Solid Waste (DSW), is building a R140-million 1 200 t/d waste transfer station to serve the Durban area.
This new waste management facility will provide a modern and mechanised means of transferring municipal general solid wastes to landfill sites efficiently and cost-effectively.
Engineering and environmental consultant Jeffares & Green, the company responsible for designing the Electron Road waste management facility, in Durban, was appointed to design a modern and mechanised waste transfer station (WTS) at Electron Road, in Springfield Park – an industrial and commercial area north of Durban, near the banks of the Umgeni river.
The main structure, a refuse transfer station and compaction hall, where waste will be offloaded, compacted and containerised for bulk transportation, will be built on a 4 ha site.
At present, most of the waste from City of Durban is disposed of at the Bisasar Road landfill site, in Springfield Park, which is reaching full capacity. When this happens, waste collection vehicles will have to travel to the Buffelsdraai landfill site about 33 km away from the city – more than double the 15 km distance that is considered an economic travelling cost for collection vehicles.
These prohibitive transport costs have made the provision of a WTS financially prudent, particularly since the Electron Road site is less than 1 km from the Bisasar Road site.
The shorter transportation distance will also reduce fuel consumption and wear and tear on road systems, while creating an overall carbon emission reduction by implementing this efficient transport system.
Associated infrastructure will include a three-storey office block adjacent to the main compaction house, which will provide facilities for DSW employees, as well as an auditorium for education and training purposes.
Further, upgrading of Electron road to provide dedicated access to the site will be undertaken, while access roads to the various handling areas within the site, a security building, weighbridge kiosks for the monitoring and recording of waste mass, wash bays for the waste fleet, a carpark and a covered waiting area at the entrance to the facility, will also be built.
The contract involves the construction of infrastructure, the structures and civil works, including the mechanical plant for the operation of the facility, as well as building-related mechanical, electrical and electronic works.
The civil works include the refuse transfer station, a compaction hall, container-handling operations, offices, weighbridge infrastructure, mechanical equipment and plant. It also entails the construction of a workshop, wash bay, diesel storage facility, security facilities, entrance building and weighbridges, says Jeffares & Green.
Additionally, the design includes the use of natural lighting and ventilation, stormwater treatment, pollution control by means of litter traps, silt traps and oil traps.
Specific stormwater treatment processes were designed to control pollution and allow discharge of an acceptable effluent from the site.
A unique feature of this project is the compaction process that will be used for the first time in South Africa.
This system was accepted as an alternative design proposed by the successful bidder, construction company Aveng Construction. The Husmann Compaction System, which is imported from Germany, does not use conveyors but provides a quick and clean answer to waste compaction.
Aveng Construction has started with piling and layer works.
Aveng Construction senior contract manager Brad Wyatt says the company will be using a unique approach to the required 156 concrete columns.
“Instead of doing 7.5 m columns in the conventional way, we will be precasting them on the ground and then lifting them into place. This will result in outstanding quality, as well as a safer and quicker method compared with the conventional way,” he says.
Another innovative construction approach will be the tilt-up wall system, which will be erected on site. Instead of conventional brickwork that needs to be laid layer by layer, these walls are cast in moulds that have the same face-brick finish as a conventional wall and are then erected as complete units.
These harbour beds comprise unconsolidated sediments of sand, silts and clays in variable layer thicknesses, which extend to considerable depths. The soft clay horizons have a high organic content and are highly compressible, which results in long-term settlement of the clays once an imposed load is applied.
The main transfer-station structure imposes heavy loads of up to 2 000 kN for each column onto the subsoils. Owing to this, the use of shallow raft foundations was discounted as a result of the unacceptably high predicted settlements of up to 150 mm. The solution was to install deep pile foundations, says the company.
Specialist piezocone testing was undertaken across the footprint of the structure. The piezocone equipment is a modification from the original cone penetration test, otherwise known as the Dutch Cone.
The results of the piezocone testing indicated that a competent founding medium of dense coarse sand was encountered only at a depth of about 25 m below ground level.
Several piling options were investigated and the precast driven pile was the one most suited to the site, as it is capable of extending to significant depths and is relatively quick to install, says Jeffares & Green.
The final design included more than 400 350 mm x 350 mm precast driven piles to depths of between 25 m and 29 m. Some recently driven piles have even reached a depth of 39 m, the company adds.
The basic principles of the unit are to try and relocate species to their original aspect;
Another element is the stormwater inlets, which are designed to effectively remove litter and sediment before they reach other systems.
Rainwater will be captured for the washing of containers, floors and vehicles on site.
Visual aids to monitor energy consumption on site are being considered to create awareness around this issue, says Jeffares & Green, adding that the team is constantly looking into opportunities to hand over a facility that supports sustainability and economics.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Creamer Media Senior Deputy Editor Online
Other Environment News
Updated 16 minutes ago South African pump manufacturer Hazleton Pumps International took top honours in the Most Innovative Company and Customer Service of the Year categories of the Steel and Engineering Industries Federation of Southern Africa’s (Seifsa’s) Awards for Excellence, on...
Updated 25 minutes ago Shares in AltX-listed Ansys surged nearly 9% on Friday after the Centurion-headquartered information technology firm successfully broke out of the red for the first time in two years and delivered triple-digit increases in its financial performance for the 2015...
Updated 25 minutes ago While a healthy appetite for investment in government’s infrastructure development programme existed among international and domestic providers of capital, policy coherence, a clear roll-out strategy and a champion in government were critical to triggering this...
Recent Research Reports
Steel 2015: A review of South Africa's steel sector (PDF Report)
Creamer Media’s Steel 2015 report provides an overview of the key developments in the global steel industry and particularly of South Africa’s steel sector over the past year, including details of production and consumption, as well as the country's primary carbon...
Projects in Progress 2015 - First Edition (PDF Report)
In fact, this edition of Creamer Media’s Projects in Progress 2015 supplement tracks developments taking place under the Renewable Energy Independent Power Producer Procurement Programme, which has had four bidding rounds. It appears to remain a shining light on the...
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
This Week's Magazine
While strongly welcoming the promulgation of the new Part 101 of South Africa’s civil aviation regulations, governing the commercial operation of civil remotely piloted aircraft (RPAs) in South Africa, the Commercial Unmanned Aircraft Association of Southern Africa...
LSM Distributors has contracted engineering consultancy WSP | Parsons Brinckerhoff Africa to undertake the R100-million restoration of the 54-year-old Kyalami racetrack, situated in Midrand. The restoration will assist in re-establishing it as a venue for...
South African Defence Minister Nosiviwe Mapisa-Nqakula has expressed the hope that the defence budget will be significantly increased over the next five years. She did so while addressing the media in her recent budget vote media briefing. The 2015/2016 defence...
The African Development Bank (AfDB) has been an implementing agency for the Global Environment Facility (GEF) since 2008. The relatively young portfolio has 28 projects over 30 countries on the continent according to the 2014 AfDB and GEF annual report released...
Investment in South African youth through apprenticeships and learnerships will not only create direct benefits for businesses but will also contribute significantly to job creation and socioeconomic transformation in the country.