http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.04Change: -0.16
R/$ = 12.07Change: -0.10
Au 1204.60 $/ozChange: 1.40
Pt 1170.50 $/ozChange: 4.00
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Letters Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Aug 24, 2012

Construction on new Durban waste transfer system under way

Back
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
Construction|Engineering|Harbour|Africa|Building|Concrete|Contractor|Conveyors|Design|Diesel|Education|Environment|Industrial|Lighting|PROJECT|Road|Roads|SECURITY|Storage|Sustainable|System|Systems|Testing|Training|Waste|Waste Management|Water|Africa|||Energy|Equipment|Maintenance|Solutions|Systems|||Environmental|Infrastructure|Waste|Water|Operations|
construction|durban|engineering|harbour|africa-company|aveng-construction|building|concrete|contractor|conveyors|design|diesel-company|education-company|environment|industrial|jeffares-green|lighting|project|road|roads|security|storage|sustainable|system|systems-company|testing|training|waste-company|waste-management|water-company|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-technology|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.
The facility will reduce the unavoidable expense of having to transport solid waste to landfills, which are sited further and further from the point of generation, says Jeffares & Green.

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.

Structure Design
The Electron Road WTS will comprise a four-storey building and some 4 290 m2 in floor space, in which waste will be offloaded into compaction units, compacted into purpose-made containers for bulk transportation and transported to the new Buffelsdraai landfill site.

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.

Construction
Construction started in March and will continue for 78 weeks, although Jeffares & Green says the contractor is targeting an earlier completion date.

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.

Geotechnical Engineering
Piling is currently under way in less-than-ideal foundation conditions, as the site is underlain by deep alluvial deposits, which are typical of the low-lying areas in and around Durban, reports Jeffares & Green.

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.


Landscaping
DSW will apply to the Electron Road facility the same award-winning environmental approach it used at the Mariannhill Landfill Conservancy site, just outside Durban, which is today considered a best-practice ecosystem restoration project.


The successful process is driven by Plant Rescue and Relocation Unit (Prunit), which is headed up by horticulturalist and rehabilitation specialist Richard Winn. Prunit applied the philosophy of moving plant species once only and uses a rehabilitation nursery as a backup, if direct relocation is not possible.

The basic principles of the unit are to try and relocate species to their original aspect;
to import no foreign soils; to relocate grasslands with original top soil; to
relocate original watercourse species to wetland nurseries for future use; to create a similar habitat to that which originally occurred; and to only relocate species within 50 km, as per international biodiversity protocol.


This ecosystem restoration project has created a large holding nursery for the storage of indigenous vegetation, which has been hardened-off to withstand rigorous conditions with little or no maintenance.


For example, a nursery of wetland plants has been grown for the future establishment of “leachate through wetland” processes of returning water to the environment, adding that these plants have been specifically hardened-off for contaminants found in the waste industry.


Little plant material could be salvaged from the Electron Road site and DSW, Prunit and Jeffares & Green worked closely together to develop an automatic computer-aided design of what could potentially be provided by the holding nursery.


This, says Jeffares & Green, is an attempt to create a sustainable ecosystem where every plant is selected and planted to fulfil a specific purpose.
The engineered stormwater swales, rainwater harvesting and stormwater ponds have been designed to interlink and are to be planted with indigenous vegetation that are selected to help provide functional solutions to issues identified on site.


Street furniture, lighting, signage, benches, tables and water points have been incorporated into the landscape design, together with habitat-creation opportunities including bird totem poles, structures for fly traps and bat and owl houses.


This is linked to the rodents, insects and reptiles that the company says are likely to appear with the operational activities of the site.


A deck area has also been included on the western stormwater attenuation pond, which is linked to the office building on site. These measures are an attempt to ameliorate environmental impacts with natural, green solutions.


Green Engineering Initiatives
Various elements, over and above those already mentioned, have been considered during construction, says Jeffares & Green. One item that has been carefully designed is the Bio-Swale, a carefully landscaped and shaped, open stormwater system that is built to enhance the removal of solids, metals and other waste from the stormwater.

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)
 
 
 
 
 
 
 
 
Other Environment News
The Coega Development Corporation (CDC) is currently rolling out a R126-million sanitation upgrade project at rural schools in the Eastern Cape on behalf the Eastern Cape Department of Education (DoE). The programme will see 947 toilets built at 108 schools in the...
Many of South Africa’s sewage treatment plants face major challenges, including the lack of technical capacity and funding to maintain and operate ageing sewage treatment infrastructure, as well as the ability to expand the sewage treatment capacity to meet the...
South Africa’s municipalities need to develop an integrated master plan to address delivery constraints of the country’s wastewater treatment plants, says consulting engineering firm WSP Parsons Brinckerhoff Africa technical director Leon Saunders. He points out that...
Article contains comments
More
 
 
Latest News
South African mining and energy adviser Ted Blom has raised a litany of concerns about the state of power utility Eskom and has warned of runaway costs and shortfalls in coal and water, as well as rail capacity. Blom was surprised by the recent buoyancy shown by...
JSE-listed Astrapak will sell specialised packaging systems manufacturer Knilam to Mapflex SA for R17.7-million. The proceeds would be used to reduce Astrapak’s current level of gearing.
The last of the 26 mooring units comprising the Port of Ngqura’s automated mooring system (AMS) have arrived at the port and are expected to improve port efficiency and safety, further driving the Transnet National Ports Authority’s (TNPA’s) objective of establishing...
More
 
 
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
Sappi Southern Africa CEO Alex Thiel
Forest products group Sappi has confirmed the selection of its 25 MW biomass-to-power project, to be erected at its Ngodwana mill, in Mpumalanga, as a preferred bidder under the South African government’s Renewable Energy Independent Power Producer Procurement...
Information and communications technology (ICT) distributor DCC is making Windows- and Android-operating systems tablets available through retailers and education equipment suppliers to provide school children with affordable, high-performance education tools. The...
Another cement manufacturer is set to enter the Ugandan market, raising hopes that prices will come down and spur growth in the construction industry. National Cement, a Kenyan manufacturer, has unveiled plans to invest $195-million in a new manufacturing plant in...
With growth rates exceeding that in the developed world – at an average of between 4% and 5% between 2002 and 2014 – African countries provide investors with ample reason to tap into booming consumer demand says Manufacturing Circle executive director Coenraad...
The South African Chamber of Commerce and Industry’s (Sacci’s) Business Confidence Index (BCI) decreased by 3.7 index points month-on-month to 89.1 in March.
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks
Subscribe Now for $96 Close
Subscribe Now for $96