CHAPTER FIVE
SOLID WASTE AND AGRICULTURAL DEVELOPMENT IN SCHOOL INTRODUCTION
(B) Phosphorous: Phosphorous in solid waste occurs mainly as inorganic compounds primarily P03 and is normally expressed as total phosphate. One of the primary reasons why land application of wastes is becoming a more viable treatment alternative is the soils high capacity to remove and hold large quantities of phosphorous.
HAZARDOUS SUBSTANCES
Many pathogenic microorganisms and hazardous chemicals are normally generated through the decomposition of solid wastes such as garbage and septic sludge. These substances are relatively less concentrated but treatment processes including land application systems tend to concentrate toxic materials. This initially occurs in waste sludge and finally in the soil profile.
The presence and concentration of many hazardous materials pose a threat to the society. Waste management schemes have been developed as a rational basis for their control. Data from literature show that the public health dangers due to such contaminants as pathogens and heavy materials can be minimized in application systems.
Pathogens: Many viruses are found in solid waste dump. More than 70 new entries viruses have been identified in raw solid waste over the past 25 years all of which are found in human faces. The effective infection-producing dose rate of virus organisms was thought to be as high as a million but recent studies have shown that one virus particle may cause an infection in the host while this individual may not develop a clinical disease, he may unknowing become a carrier. (MC Dermott 1975) bough most disease causing organisms can be found, the concentrations are low and many are therefore difficult to isolate pathogenic protozoa and helminthes are parasitic flat worms whose eggs are very difficult to destroy and remove completely, Toxic Element: These are found in solid wastes. They include many substances which are also essential to microbial and plant life.
Emeka Jilly Ejiowhor
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