May 04, 2012
Packaged plants can ensure long-term sewage treatment in remote areasBack
Dublin|Africa|Bannow Africa|Bannow Exports MD Ted O’Morchoe|Flow|Housing|Pipes|PROJECT|System|Systems|Water|Africa|Ireland|Maldives|Seychelles|South Africa|Activated Sludge Technologies|Flow|Local Subsidiary|Long-term Solution|Maintenance|Pipes|Plant Manufacturer|Short-term Solution|Systems|Power|Water|Activated Sludge Technologies
© Reuse this
The ease of operation of packaged sewage treatment plants is critical for their common applications in remote places, such as island the resorts in the Seychelles and the Maldives, as well as in rural areas, such as the demonstration plant at Olwazini, in South Africa’s Cradle of Humankind, in Gauteng.
The modular plants enable easy expansion of existing systems to meet the scale of treatment demand.
“Packaged plants should be prefabricated, so that quality control is done in the factory and does not depend on work on site, where installation must be quick and simple.”
Bannow Exports, of which Bannow Africa is its local subsidiary, reports that its Blivet packaged sewage treatment plant, a hybrid of rotating biological contactor and activated sludge technologies, removes ammonia, nitrates and nitrites, phosphorus and nut- rients, with the option to design the system to enable effluent to be used for irrigation of crops.
Disinfection, should it be required, is done using ultraviolet disinfection or liquid or tablet chlorine dosing matched to the flow rate. The Blivet plants can also be monitored remotely.
“As soon as people get water into their homes, they will begin to produce sewage. We should use packaged sewage treatment plants to contain pollution before it becomes a problem.
“The plant can be applied as a short-term solution to bolster overloaded municipal sewage treatment plants, or as a sustainable, long-term solution in areas that need treatment capacity but are not connected to sewer- age pipes, or in remote locations where it is not economically viable to install large- scale municipal treatment plants,” he explains.
“Further, a single plant can be installed for up to 100 houses or can be deployed in series and in parallel to provide treatment for larger populations,” notes O’Morchoe.
The effluent flows into a primary settlement tank and then into the heart of the plant, which is its Aerotor rotating biological drum. As the drum rotates it lifts the effluent into its channels, effectively aerating it to promote bacteria and biomass growth, which absorb the nutrients.
Further, the system has low power consump-tion, owing to its design that uses the rotation of the drum to aerate the effluent, and can also be designed to use solar power sources.
“The Blivet has low operation requirements and naturally adjusts to changes in flow rate, with bacteria growth proportional to sewage inflows.”
Meanwhile, the system has a life span of 20 years in normal applications and is sustainable owing to its low requirements for electricity and maintenance.
A project in Ireland saw the company installing 22 Blivet units to provide temporary treatment for a housing development near Dublin, until the municipality could build a formal sewage treatment plant within five years. The Blivet plants have been in operation at these sites for almost ten years and the municipal plant will only be completed this year, he notes.C
ommissioning such a plant takes a few months, and the plants are sustainable and an effective way for corporate companies or nongovernmental charities to boost local communities, he adds.
Bannow Africa provides standalone units and fully engineered solutions that can include more rigorous treatment, such as disinfection, depending on the application. The management of sludge from the plants is similar to other biological treatment systems, and the plant has three months of insludge storage. Sludge drying beds can be included to reduce the amount of sludge in remote locations, he concludes.
Edited by: Martin Zhuwakinyu© Reuse this Comment Guidelines (150 word limit)
Other Environment News
Article contains comments
Article contains comments
Updated 4 hours ago Information and communication technology services group Gijima on Tuesday announced that it would undertake a rights offer and restructure its existing trade receivables securitisation funding programme to ensure that it had sufficient working capital to underpin the...
Updated 5 hours ago Public Enterprises Minister Lynne Brown has urged that the best candidates be nominated to serve on the boards of State Owned Entities (SOEs). “Help me identify your brightest and our best,” said Minister Brown as she launched an initiative to obtain the best pool of...
Updated 5 hours ago The Square Kilometre Array (SKA) has brought art and science together in an exhibition celebrating ancient humanity’s appreciation of the night sky. In a first for the SKA Organisation, indigenous and local artists from South Africa and Australia have collaborated in...
Recent Research Reports
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.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
This Week's Magazine
The South African new vehicle market is likely to reach around 630 000 units in 2014, down from the 650 000 units recorded in 2013, says Toyota South Africa Motors (TSAM) president and CEO Dr Johan van Zyl. Van Zyl is also president of the National Association of...
Efforts by the Kenya government to increase energy generation by 5 000 MW over the next three years received a major boost following the award of a $2-billion contract to build a coal power plant in Lamu. Despite allegations of irregular tendering process, the...
Using crafty wordplay on a well-known Internet meme, brilliant South African-born US entrepreneur and businessperson Elon Musk announced that Tesla Motors would not initiate patent lawsuits against anyone who, in good faith, wanted to use its technology. Instead,...
August new vehicle sales declined by 1.4%, to 55 722 units, compared with the same month last year. Assisted by the car rental market, the South African new passenger car market, at 37 953 units, contracted by 1 047 units, or 2.7%, compared with August last year.
With South Africans facing the challenge of reducing electricity consumption, the biennial Eskom Energy Efficient Lighting Design Competition, to encourage the integration of energy efficient lighting in architectural, engineering and interior design, received a...