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effluent use on dairy farms ((Constructed wetlands are a natural…
effluent use on dairy farms
Air
negative
Water
negative
Soil
positive
-effluent binds minerals together, prevents nutrients from being leached from the soil,
helps absorb more water and holds plant nutrients.
negative
kill pasture especially where effluent has ‘ponded’ on the soil surface pollute nearby streams and rivers where it runs off paddocks into water ways pollute ground water by seeping too deep into the soil be an ineffective use of nutrients by seeping past the root zone before the plant can utilise it.
living things
negative
-Excessive plant growth, increases in the dissolved salts in water systems making it unsuitable for plants
positive
holds plant nutrients. And a closer look will be taken at the mechanisms of both plants in constructed wetlands and the microorganisms in the root zone which come into play when they remove contaminants from wastewater. The supply of oxygen plays a crucial role in the activity and type of metabolism performed by microorganisms in the root zone. Plants' involvement in the input of oxygen into the root zone, in the uptake of nutrients and in the direct degradation of pollutants as well as the role of microorganisms are all examined in more detail.
Constructed wetlands are a natural alternative to technical methods of wastewater treatment. However, our understanding of the complex processes caused by the plants, microorganisms, soil matrix and substances in the wastewater, and how they all interact with each other, is still rather incomplete.
a closer look will be taken at the mechanisms of both plants in constructed wetlands and the microorganisms in the root zone which come into play when they remove contaminants from wastewater.
The supply of oxygen plays a crucial role in the activity and type of metabolism performed by microorganisms in the root zone. Plants' involvement in the input of oxygen into the root zone,
in the uptake of nutrients and in the direct degradation of pollutants as well as the role of microorganisms are all examined in more detail.
The ways in which these processes act to treat wastewater are dealt with in the following order:
•
Technological aspects;
•
The effect of root growth on the soil matrix;
•
Gas transport in helophytes and the release of oxygen into the rhizosphere;
•
The uptake of inorganic compounds by plants;
•
The uptake of organic pollutants by plants and their metabolism;
•
The release of carbon compounds by plants;
•
Factors affecting the elimination of pathogenic germs.