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Recycling sewage into potable, drinking water is a broad and complex process. However, it could be part of the solution for water scarcity in South Africa. This is after the World Health Organisation (WHO) published its ‘Potable Reuse Guidance for Producing Safe Drinking Water 2017’ report.
Water solutions provider Proxa technical director Wimpie van der Merwe told representatives at the Water Desalination Symposium that potable reuse schemes is difficult. This is because they sufficient resources and capabilities to implement it successfully.
The WHO report said potable reuse represents a realistic, and climate-independent source of drinking water. It can provide large volumes of drinking water from wastewater available from established collection systems in both coastal and inland locations.
Desalination risks
While desalination is a growing and popular option to supplement dams, Van der Merwe said desalination comes with certain risks. These include noise, traffic, and land-use and energy consumption and waste disposal concerns. Van der Merwe explained that various processes had to be undertaken to convert wastewater into potable water.
He said there were more than 4 000 suspected contaminants. Out of these, the WHO has identified 50 key components. He further added that several processes are necessary in order to ensure public safety. This is because, according to him, no one single process can guarantee safety.
The aforementioned steps would involve reducing the remaining nutrients and removing suspended solids. They would then work on reducing dissolved solids and trace components as well as disinfecting and stabilizing the water.
The WHO says there is growing acceptance of treating wastewater into potable water. Furthermore, the process is less expensive than seawater desalination. Nevertheless, it has pointed out several challenges.
According to the report, source wastewater is of very poor quality with high concentrations of pathogens. As a result, the water can contain a broad range of contaminants. The succession of such a venture would thus include the use of complex treatment processes as well as a high level of technical expertise.


Source: construction review

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The Government of Zambia has purchased 2,000 solar-powered milling machines. This is under the Presidential Solar Milling Plant Initiative.
According to Chanda Kasolo, Eastern Province Permanent Secretary,”In Eastern Province, there has been an allocation of 358 solar plants. They have been spread across the province.”
He said through assistant secretary Royd Tembo that the programme started in December 2015. So far 100 solar milling plants are already set up in five districts in the province. These are Chadiza, Lundazi, Katete, Vubwi and Chipata.
Solar Milling Programme
“The Zambia Cooperative Federation will launch the implementation of the Presidential Solar Milling Plant programme. This is the apex board of the cooperative movement in Zambia,” Mr Kasolo said.
He added that the intended beneficiaries of the initiative are primary cooperative societies. They will contribute in value-addition to the staple food of the nation.
“It is the first of its kind to ultimately reduce the cost of processing the staple food and significantly reduce the cost of mealie meal. This initiative will also contribute to the reduction of malnutrition and improve economic stability of the rural communities,” Mr Kasolo said.
He further added that this will see the centres transform into economic zones. In these zones the installation of the machines is ongoing and will provide employment at local level.
Mr Kasolo said ZCF has set up provincial training and service centres in order to ensure sustainability and maintenance of the equipment.
“The training programme targets youths in different provinces to undergo training on how to operate the solar hammer mills. The continuity of the solar milling plants largely depends on you, the trainee today,” he said. This was during the training of solar milling plant operators.


Source: construction review










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The Federal Executive Council, FEC has approved $5.792 billion for the construction of the 3,050 megawatts Mambilla Hydro-Power project at Gembu in Taraba, Nigeria.
The Minister of Power, Works and Housing, Babatunde Fashola said that the memorandum from the Ministry of Power, Works and Housing was to the award of the Mambilla Hydro-Power plant.
Mr. Babatunde Fashola said that there were several efforts in order to bring the project to reality. He also added he was very happy to announce the approval of the contract by the government. The construction should take about 72 months (6 years),” he said.
The minister has hopes that after the completion of the project  it will boost the nation’s economy. This is because it will unleash the potential of Mambilla in the fields of agriculture, tourism and energy. According to him, the process will include the  construction of 700 kilometres of transmission lines and four dams.
Implications of the Mambilla Hydro power Project
The project will help Nigeria solve the climate change issue and fulfill its commitment under the Paris Agreement. The federal government and the China Export Import, EXIM, Bank will jointly  handle the financing of the project. The federal government will provide 15 per cent while EXIM bank will provide 85 per cent of the cost.
The Minister of Power, Works and Housing, Babatunde Fashola was incharge of giving  the news about the project. He did this alongside the ministers of labour and employment as well as the minister of sports. The Minister was giving a talk to the State House correspondents on the outcome of the Council’s meeting.
Accompanied by officials from the Federal Ministry Power,works,  40 Chinese engineers visited the the Mambilla Hydro power project . A team of experts handled the inspection of the site. The areas mapped out for the project are  from River Dongo in Gembu, headquarters of Sardauna local government area.



Source: construction review

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The generation of 700 megawatts of power  in Egbin Power Station in Lagos is being stalled due to the weak transmission infrastructure carrying generated power to the national grid. This is according to Mr. Dallas Peavey, the Chief Executive Officer of Egbin Power Plc.
This comes as a Congressional delegation from the USA has restated the country’s commitment to ‘Power Africa’. Mr. Peavey said generation of 700 megawatts was not happening because of weak transmission infrastructure.
According to Mr. Peavey poor generation causes the lack of transmission capacity to carry the generated power . These parts were manufactured by the Japanese and getting those parts has become a challenge.
But he said that they  are working with the United States to find replaceable parts. He also said that they were looking to re-engineer some parts of the system. This is  in order  for them to upgrade and improve it.
The chief executive officer added that gas was no longer a challenge. He insists that the plant has  more than sufficient gas supplies. The gas supplies helps to be able to generate power at the full capacity of the plant.
Before  privatization of the plant in November 2013, generation was below 240MW per hour.  At  the plants lowest point, only two of the six units were partially operational.

Members of the Delegation
Members of the delegation, who were present include Representative Frederica Wilson of Florida, Representative Charlie Dent of Pennsylvania, Representative Lisa Blunt Rochester of Delaware, Representative Barbara Lee of California, Representative Terri Sewell of Alabama, Gary Peters of Michigan and Senator Michael Bennet of Colorado.
They were also  accompanied by the US Ambassador to Nigeria, Mr. Stuart Symington
Privatization of the plant
Mr. Peavey said that the privatization exercise of the plant  happened three- and-a-half years ago. Since then they  have actually moved forward in the energy sector completely.  And that  one of the best ways to do it is for people to come and see it themselves and  not just to talk about it



Source: construction review





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A US$ 3.2m modern maternity centre is currently under construction in Eritrea. The construction project is in the premises of Keren Hospital.
Gedem Construction Company is the company behind the development; this is according to Eng. Gezai Negasi, coordinator of the project.
The new maternity center
It will sit on an area of 3,000 square meter and is expected to be complete in the first quarter of 2018 and ready for operation.
Doctor Yafet Hailemichael, Director of Keren Hospital, confirmed the reports and said that the construction of the new maternity center will help alleviate the workload in the hospital.
About Gedem Construction Company
Gedem Construction Company has implemented various construction and infrastructure projects in different parts of the country. Moreover, it has done the projects in the past 20 years, stated Mr. Mebrahtu Mael, General Manager of the Company.
He additionally said that the company has been engaging itself in the construction of bridges, airports, foam-concrete residential complexes.
Moreover, it has done the construction and renovation of jetties, as well as construction of road networks and the putting in place of service-rendering institutions, among others.
Noting the paramount significance of the projects implemented in improving the socio-economic wellbeing of nationals, Mr. Mebrahtu explaines that the company has not only the technological know-how but is also in a position to construct any kind of bridge thanks to the valuable experience.
It also owns various plants that produce materials, including foam-making plant, stone grinding and garage.


Source: construction review




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La Gogue Dam
Construction work to raise Seychelles’ main reservoir La Gogue Dam will start in November. The project will increase the dam’s water storage capacity. This, in turn, will increase the country’s water supply.
China’s Sinohydro Corporation is in charge of the dam built in 1969 in the northern Mahe district of Anse Etoile. Once completed in 2019, the reservoir’s capacity will increase to a total storage capacity of 1.6 million cubic metres.
A new water treatment plan is in the works as one of the projected facilities. The plan will have the capacity of treating 4,400 cubic metres of water in a day. As a result, the northern region will have guaranteed water supply.
The chief executive of the Public Utilities Corporation, Philippe Morin, said that the quality of the work for raising the dam is the key in the implementation of the project. The 2-year contract for the project has an approximated cost of $13.6m.
Residents concerns
However, some residents are concerned about the project’s impact on their living standards. Most of them with properties around the location set for the dam’s construction want assurance on compensation. They are also wary because of pollution.
Morin assured the public of measures to minimize the negative impacts. These include steps to ensure adequate water supply once water in the dam is not available for consumption.
At the moment, when there is a water shortage, Seychelles relies on several desalination plants found on all three main islands to complement fresh water sources. The Rochon Dam, currently a main reservoir, boasts a storage capacity

Source: construction review


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GreenWish Partners, a renewable energy company run by Charlotte Aubin-Kalaidjian, is planning to invest $800 million on solar-powered telecommunications towers across Africa.
The project could fuel economic growth by providing power for essential services. Sub-Saharan Africa has the lowest rates of energy access in the world. It is home to about half of the world’s 1.2 billion people without reliable electricity. This is according to the International Energy Agency. This problem extends to businesses as well as households, cutting into productivity and growth.
“We reduce the total cost of power by 30 percent,” said Charlotte Aubin-Kalaidjian. She is the founder and Chief Executive Officer of GreenWish. She is also the former Managing Director at Morgan Stanley Investment Management. “Smaller towers can run entirely on solar and battery. On the other hand, Larger ones reduce their diesel use by at least 60 percent, she added.

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A unique Kaytech manufactured Geosynthetic Clay Liner saved hundreds of people in a township south east of Johannesburg from forced evacuations.
Frequent flooding of 59 properties in Thintwa, a residential suburb of Thokoza, initially led to the Ekurhuleni Municipality making the difficult decision to relocate the affected families.
When it was realized that relocations were not viable, the council sought a technical solution to eliminate flooding in the area. After investigations, a consultant from WSP designed a network of concrete lined open channels in conjunction with an attenuation dam and a new storm water outlet. The attenuation dam will store the water until it is released via the outlet.

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Sterling and Wilson an Indian firm will start the construction of a 54 megawatt solar power plant in Kafue, Zambia at a cost of US$60 million. Mr. Atul Goyal the head of human resource said the completion of the  project would take place within eight months.
Mr Goyal was speaking at the Zambian chancery in New Delhi. This is where he paid a courtesy call to Judith Kapijimpanga Zambia’s High Commissioner to India.
He also said that President Lungu gave a directive. The directive was that the Industrial Development Corporation needed to  carry out their duties urgently. Inorder to drive the development and installation of at least 600MW of solar power to tackle power deficit in Zambia.
Importance of the project

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The green facility is in Bryanston, North of Johannesburg.  It has a state-of-the-art 10,000-litre rainwater harvesting system and rooftop solar energy generation plant. This significantly lowers the building’s carbon footprint and reduces energy consumption by 55%.

The reduced energy consumption is partly due to a 34kW solar photovoltaic system that reduces the demand for grid power by at least 25%, the company stated.

Green facility features

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New ambitious targets set by the Rwanda Energy Group (REG) could end electricity supply woes for Kigali residents. People will be able to enjoy uninterrupted power supply in the next 5years.
At least  563MW installed power generation has been targeted by the government by the end of next year. “The power utility targets to connect all Rwandan households by 2014,” said Eng Ron Weiss who is the REG chief executive.

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