scholarly journals Freshwater algae and the economy

1988 ◽  
Vol 7 (4) ◽  
pp. 195-198
Author(s):  
W. E. Scott ◽  
T. Zohary
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Water Treatment ◽  
Fresh Water ◽  
Animal Health ◽  
Property Values ◽  
Algal Growth ◽  
Economic Importance ◽  
Freshwater Algae ◽  
Chemical Changes

This article discusses the current economic importance of fresh water algae and possibilities of exploitation of algae in the future. Desirable and undesirable aspects are considered and illustrated with examples mainly from South Africa. The excessive development of undesirable algae in freshwater adversely affects the water quality by a number of chemical changes which can vary from tastes and odours to production of substances that consitute a threat to human or animal health. Removal of unwanted algae adds considerably to the costs of water treatment. Excessive algal growth impairs recreational activities and affects shoreline property values.

A Water Treatment and Recycling System for Intensive Fish Farming

1993 ◽  
Vol 27 (1) ◽  
pp. 141-148 ◽  
Author(s):  
K. K. Chin ◽  
S. L. Ong ◽  
S. C. Foo
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Water Resources ◽  
Water Supply ◽  
Fresh Water ◽  
Fish Farming ◽  
Pond Water ◽  
Fish Ponds ◽  
Lagoon Water ◽  
Fresh Water Supply

Rain water was collected from storm drains and after filtration was stored at an earth pond. The pond water was the main source of fresh water supply for intensive fish cultivation. To conserve the limited water resources, effluent from fish cultivating ponds was treated and recycled for reuse. With proper blending of water from the storing earth pond and recycling of the water between the fish ponds and the fish lagoon, water quality at the fish ponds and the lagoon was maintained at acceptable levels. Although fresh water replenishing rate was low there was no serious buildup of metals and total solids in the fish ponds.

scholarly journals Removal of aluminium and iron from surface water by conventional water treatment

2016 ◽  
Vol 17 (3) ◽  
pp. 733-744
Author(s):  
S. Arendze ◽  
M. S. Sibiya
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Water Treatment ◽  
Metal Concentration ◽  
Conventional Treatment ◽  
Treatment Process ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Source Water ◽  
Iron Concentrations

Detailed source water monitoring showed large variations in the total concentrations of aluminium and iron in the Vaal Dam, South Africa, which were highlighted as a specific concern for one of the largest drinking water treatment plants in South Africa. This study aimed to better understand the presence of these metals in the source water, removal of these metals through the conventional treatment process, and final water quality trends, for the period 2008 to 2014. Aluminium and iron concentrations were highly variable and showed significant influence on colour and turbidity in source water. Sedimentation performed well, and removed over 70% of the metal concentration from the raw water. Filtration removed 15% of the remaining aluminium and iron concentrations. The pH and turbidity of the final water had minor effects on the metal concentration in the final water. The conventional treatment process was shown to be capable of removing aluminium and iron from the source water as both were within water quality limits in the final water. This study highlighted the importance of source water quality monitoring and treatment plant efficacy in evaluating whether the current treatment technology is appropriate for current and future challenges.

Improvement of Lake Water Quality by using Moving Rapid Water Treatment System

2018 ◽  
Vol 18 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Kwang-Hee Lee ◽  
◽  
Min-Ho Kim ◽  
Nam-Woo An ◽  
Chul-hwi Park
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Lake Water ◽  
Treatment System ◽  
Lake Water Quality ◽  
Water Treatment System

The Clogging of Sewage Lagoon Aerators

1989 ◽  
Vol 21 (6-7) ◽  
pp. 669-676
Author(s):  
E. Davis
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Algal Growth ◽  
Growth Conditions ◽  
Field Investigation ◽  
Large Bubble ◽  
Physical Factors ◽  
Pull System ◽  
Fine Bubble

The Lagoon method of waste water treatment was introduced into Canada in the mid 1950's. At present, of the 2019 waste water treatment systems in Canada, 1163 are Lagoon systems and 265 of these include aeration equipment. Continuing difficulties associated with the plugging of the aerators have led to a study of this maintenance problem. Physical factors have been identified as the major cause of the plugging of large bubble aerators; whereas chemical solution and deposition under high algal growth conditions have been set forward as the causes of fine bubble aerator plugging. Selected field investigation data collected indicate that the proposed push-pull system of precipitation of calcium carbonate and silica dioxide may in fact be responsible for the plugging of fine bubble aerators with these materials.

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