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Water&Sanitation Africa

The magazine is dedicated to the management, preservation, treatment and provision of water throughout the African continent.
Publisher | 3S Media (Pty) Ltd |
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Frequency | Bi-monthly |
Coverage | May/June 2006 - current |
Language | English |
Journal Status | Active |
Collection(s) |
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Putting people first
WISA is committed to constantly improving its service delivery and the organisation’s new ISO 9001:2015 certification is another step towards ensuring that members’ needs are met and prioritised. According to Adrie Krugel , operations manager at WISA, the institute, under the leadership of CEO Dr Lester Goldman, places a strong emphasis on good governance and compliance with regulations. This means excellent customer service from grassroots level up, as well as customer-focused policies and processes.
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Enhancing WC/WDM enablers
Having an initial implementation plan and budget are necessary pre-launch enablers for a WC/WDM project. Then, as soon as implementation begins, it is invariably necessary to ensure that the WSA’s executive council and relevant staff have an adequate understanding of the importance of WC/WDM and are motivated to support its implementation.
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Reshaping concrete
Currently, no specific standards exist to allow the use of water other than that of potable standard in the concrete manufacturing process. However, the recent drought in the Cape region has spurred the Southern Africa Readymix Association (Sarma) to join forces with the City of Cape Town to use effluent in the concrete space.
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Combatting sulfate attacks
Sulfates, especially in the form of salts of calcium, sodium, potassium and magnesium, are a challenge for concrete civil works in aggressive environments such as sewage plants, mines, and coastal areas where soils are high in sulfates. Sulfates are said to ‘attack’ concrete because they can permeate the surface layers in solution with water. This reacts with unreacted C3A and calcium hydroxide in the cement paste, leading to the formation of various compounds that can be upto 600% more voluminous than the original chemicals. As a result, the outer layer of the concrete suffers cracking, spalling and separation of aggregate from the cement paste. This leaves more surface area of the paste to react and exposes any reinforcing to corrosion.
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A new model for pipe assessment
In prioritising the renewal efforts of wastewater infrastructure, the best approach needs to be sought to identify which pipes to replace and when in order to avoid a more costly situation of completely failed infrastructure that must be restored. According to Professor John Matthews, director of the Trenchless Technology Centre at Louisiana Tech University, this requires a risk-based decision-making approach. In order to determine the risk of an asset you need to know the probability of failure and the consequence of that failure.
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Reinventing sanitation
Despite improved access to sanitation facilities, many South African households are still without adequate sanitation facilities, and in some cases, any facilities at all. Stats SA reports that 45.6% of households do not have a toilet inside their dwelling. And of the 75.5% of the population with access to ‘adequate’ sanitation, 12.2% are using pit latrines. When one considers that 93.6% of South African households have a cell phone, the lack of sufficient and appropriate sanitation is a major concern.
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© Publisher: 3S Media (Pty) Ltd