By Klein Gomes
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Plants other than reed canary grass were also tested and those that flourished best in the NFT system were: cattails, bulrush, strawflowers, Japanese millet, roses, Napier grass, marigolds, wheat and phragmites. Puitied Water Capillery Ped Fig:7. Nutrient Film Technique Variation of Hydroponic Plant Production Systems Chapter 2 Ecological Principles of Wastewater Treatment The biological oxidation of an organic waste-sewage or industrial waste-either in bacteria beds or by activated sludge is basically the use of the organic matter as food by heterotrophic microorganisms, mostly bacteria or fungi.
Even when full analysis is practicable, because of interactions involving synergistic and antagonistic effects and other factors such as pH and dissolved oxygen, it is difficult to predict the overall effect on a stream. Although bio-assay measures more directly the toxicity of an effluent to the animals used in the test, the effect on the complex stream community and environment in which organisms naturally exist is agair:t difficult to forecast. In contrast to organic pollution, which by encouraging the activity of certain species causes a change in the balance of populations, toxic pollution tends to suppress activity generally.
Domestic sewage is a relatively weak nutrient solution and normally the rate of oxygen uptake will exceed the uptake of the nutrient and is not, therefore, limiting. With strong industrial wastes, however, the nutrient uptake may exceed that of oxygen which would then be limiting. The degree of aeration should, therefore, be related to the BOD loading of the plant rather than to the volumetric loading. The greatest oxygen demand occurs at the inlet end of the aeration tank, where the waste and the deoxygenated sludge enter.