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Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 29 June 2010 WATER DEPARTMENT MOVES TO CURB POLLUTION OF WATER SOURCES The Department of Water Affairs has noted with concern recent media reports of an environmental lobby group -the Environment and Conservation Association, which is said [...] Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 26 April 2010 South Africans could find themselves dining in future on chickens and other animals reared on a protein-rich diet extracted from the local sewerage works. Researchers at the University of Pretoria and other academic institutions in the developing world say single-cell proteins extracted from sewage sludge are rich in amino acids, minerals and vitamins and hold “enormous potential” to alleviate severe human malnutrition by lowering the rising cost of animal meat. Several experiments have already been done in South Africa and Nigeria to fatten up chickens, goats and pigs on food supplemented with extracts from urban sewerage works or dried chicken manure. This was one of the more bizarre proposals presented to delegates at the Water Institute of South Africa conference in Durban last week by researchers from the University of Pretoria’s chemical engineering department. A research paper by associate professor Evans Chirwa and masters student Moses Lebitso reports on experiments at the university to feed more than 40 chickens on a variety of diets – including treated extracts from 100 percent sewage sludge collected from the Zeekoeigat sewage works in Gauteng. According to Chirwa and Lebitso, the chickens raised on 100 percent sludge gained weight faster than a control group of chickens raised on conventional feeds such as fishmeal. They also calculated that it was far cheaper to feed chickens on sewage sludge than fish meal, soya oilcake or lucerne. It cost the researchers R7,63 to fatten up broiler chicks to a weight of 1,88kg using conventional fishmeal, but only R6,65 to fatten broilers to 1,97kg using extracts from sludge. One potential problem, they note, is that sludge from city sewage works often contains toxic heavy metals from industrial wastewater, including lead, manganese, copper, cadmium and zinc. It was therefore important to “remove or reduce” the heavy metal content to levels which complied with allowable or tolerable levels before feeding the sludge to animals. Continue reading Chickens gain weight faster on sewage sludge Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 16 April 2010 “Your department has let South Africa down, and seriously so,” Democratic Alliance MP Annette Lovemore told Water Affairs Minister Buyelwa Sonjica. Lovemore, speaking during debate on the water affairs budget vote in the National Assembly, called on the minister to show “vital, critical and urgent leadership to address the current shocking level of mismanagement of our water resources”.  Excessive concentrations of nutrients stimulates algal growth resulting in the decrease of water quality and the emergence of harmful algal blooms. Ground and surface water quality in South Africa was deteriorating fast, and people had died after drinking polluted water, she said. “Animals in the Kruger National Park and ecosystems across the country are under threat. Tourism is compromised by the eutrophication of rivers and dams. Water treatment costs are escalating due to poor raw water quality. “Farmers are unable to irrigate with polluted river water. The availability of water to sustain economic development and human and environmental health is diminishing. Opportunities are being seriously undermined,” Lovemore said. United Democratic Movement leader Bantu Holomisa told MPs they were sitting on a time bomb. Continue reading Water quality deteriorating fast warns MP Posted by: Saving Water SA (Cape Town, South Africa) - partnered with Water Rhapsody conservation systems – 02 April 2010 A new warning has been issued to the public not to swim or fish in the Swartkops River as the water quality has deteriorated further. Swartkops River Mouth. Photo by Graham Hobbs. Last month, [...] |
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