Nov 27, 2009
Gansbaai wastewater project incorporates techno innovationBack
Engineering|Consulting|Industrial|PROJECT|Project Management|SSI|Water|The Netherlands|Energy|Environmental|Francis Gibbons|Water|Overstrand|Ground Breaking Nereda |Ground Breaking Nereda Technology|Nereda Technology|Wastewater Treatment
© Reuse this
“Nereda is a revolutionary technology for the treatment of domestic and industrial wastewater,” SSI water sector GM Francis Gibbons tells Engineering News.
The technology was developed by DHV in partnership with the Delft University of Tech- nology, the Dutch Foundation for Applied Water Research and the Technology Foundation.
Gibbons notes that Nereda uses aerobic sludge granules as opposed to conventional activated sledge flocs. The granules settle much faster than conventional flocs and can operate at mixed liquor concentrations comparable with those of a membrane bio- reactor, while maintaining high settling velocities. The higher biomass concentration allows for a much smaller footprint compared with traditional activated sludge plants.
“The Gansbaai wastewater treatment works is a first-in-the-world project that is using the Nereda technology. We refer to the project as a demonstration-scale project. It was completed last year.”
Owing to the reduced footprint, the proposed plant was able to fit onto the existing site and allowance was made to increase the plant capacity by another 3 M∙/d on the same site of the town.
Gansbaai made use of the existing sewer- age works close to the municipal offices. One area is connected through a piped sys- tem; the other areas are serviced by tankers that deliver septic tank effluent to the works. The capacity of the old sewerage works was limited and the quality of the effluent did not conform to the standards set by the Depart- ment of Water and Environmental Affairs. Faced with increased development in the greater Gansbaai, the Overstrand municipality decided to upgrade the capacity of the old sewerage works to 2 M∙/d in the interim.
The existing site had very limited potential for conventional plant expansion, but was centrally located, whereas the intended new site would have been positioned outside the town where additional land would have had to be bought and an environmental-impact assessment conducted.
Nereda guarantees a 30% energy consumption saving.
“At Gansbaai, a 43% saving was achieved by using the technology, leaving the final project costs at R25-million. A capital cost saving of at least 20% can be expected, but varies from project to project,” says Gibbons.
The test results at Gansbaai revealed that a good-quality effluent had been produced, especially considering the variable nature of the sewage delivered to the works, as most of the effluent is carted by tanker from septic tanks.
Edited by: Martin Zhuwakinyu© Reuse this Comment Guidelines (150 word limit)
Other Water News
Article contains comments
Updated 34 minutes ago Global crude steel output in September, at 134.4-million tonnes, was marginally lower than the 134.5-million tonnes produced in September 2013. According to the World Steel Association (worldsteel), China produced 67.5-million tonnes of crude steel in September,...
Updated 3 hours ago Stand a chance to win a CAT Phone. Subscribe to Engineering News & Mining Weekly at a 30% discounted rate. The weekly print magazines will be posted to your preferred postal address. Also gain online access to: Project Browser - providing an overview of latest...
Recent Research Reports
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
This Week's Magazine
The broad-based black economic-empowerment (BBBEE) alignment process in the con-struction sector has begun, dur-ing which the sector codes of the Construction Sector Charter Council (CSCC) will be aligned with the revised Codes of Good Practice (CoGP), which come...
It is second time lucky for Toby Venter. Ten years ago he negotiated to buy the Kyalami racetrack, but “the deal did not materialise”.
Environmental solutions company I-Cat started construction work on its R22-million, 1 949 m2 environmentally sustainable office and warehouse facility, commissioned by I-CAT Environmental Solutions, at a launch event in October. The new sustainable I-CAT campus,...
Effective file synchronisation and sharing across an organisation’s structures can provide the basis for robust mobile-device and document management while maintaining proper backup, version control and content distribution. These are the lessons learned by complex...
Hotel group Carlson Rezidor currently holds the largest hotel pipeline in Africa with 30 hotels and 6 300 rooms under development. The hotel group develops and operates Radisson Blu in the upper upscale segment and Park Inn by Radisson in the mid-market segment. With...