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| Environment | 7 |
| Land Use | 7 |
| Learning Modules | 7 |
| Sanitation | 7 |
| Soil Science | 7 |
| Waste Disposal | 7 |
| Wastes | 7 |
| Science Education | 5 |
| Biology | 3 |
| Chemistry | 3 |
| Instructional Materials | 3 |
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| Clarkson, W. W. | 7 |
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| Guides - General | 7 |
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Clarkson, W. W.; And Others – 1978
The treatment of wastewater phosphorus via land application includes both chemical and biological mechanisms. Chemically, phosphorus reacts with iron, aluminum, and calcium compounds in the soil providing efficient removal over a wide range of pH values. Phosphorus is also absorbed by rooted plants which, upon harvest, constitute a further removal…
Descriptors: Chemistry, Environment, Land Use, Learning Modules
Clarkson, W. W.; And Others – 1978
Drainage for land treatment sites must be evaluated with respect to the purpose the system is meant to achieve. Off-site drainage controls the flow of storm runoff onto the site or groundwater incursion into the soil within the site. On-site drainage is employed for a variety of reasons. These two areas of drainage control must be designed as a…
Descriptors: Agriculture, Environment, Land Use, Learning Modules
Clarkson, W. W.; And Others – 1978
This module expands on the introductory discussion of nitrogen in other modules. The various chemical forms of nitrogen found in land treatment systems are defined. Inputs from waste application as well as natural sources are quantified for typical situations. A discussion of nitrogen transformations in the soil includes mineralization and…
Descriptors: Biology, Chemistry, Environment, Land Use
Clarkson, W. W.; And Others – 1978
This module sketches out the impact of sewage organic matter on soils. For convenience, that organic matter is separated into the readily decomposable compounds and the more resistant material (volatile suspended solids, refractory organics, and sludges). The fates of those organics are reviewed along with loading rates and recommended soil…
Descriptors: Biology, Environment, Land Use, Learning Modules
Clarkson, W. W.; And Others – 1978
This module describes important criteria to use in evaluating land for waste treatment sites and tells where the necessary information for such evaluation can be obtained. Among the important criteria for evaluation are climate, land use of potential site and surrounding areas, topography, drainage characteristics, soil properties, and geology.…
Descriptors: Environment, Geology, Instructional Materials, Land Use
Clarkson, W. W.; And Others – 1978
This module examines the basic properties of soil which have an influence on the success of land treatment of wastes. These relevant properties include soil texture, soil structure, permeability, infiltration, available water capacity, and cation exchange capacity. Biological, chemical and physical mechanisms work to remove and renovate wastes…
Descriptors: Biology, Chemistry, Environment, Instructional Materials
Clarkson, W. W.; And Others – 1978
This module discusses some of the objectives of incorporating vegetative cover in land treatment systems. Specific crops and forest cover are mentioned in relation to benefits associated with each, and specific treatment alternatives (irrigation, overland flow, and rapid infiltration) are included in relation to vegetative cover considerations.…
Descriptors: Agronomy, Botany, Environment, Instructional Materials
