Two acronyms popularly in use reflect the importance of dealing with lives with disabilities. DALYs or 'Disability Adjusted Life Years' reflect the assumption that all life years are not considered to be equal, clearly the assumption of non-disabled statisticians oblivious to the importance of working for a world in which no adjustment would need to be made. DE or 'Disability Expectancy' is joining life expectancy as an important quality of life indicator. We can hope that the individuals who enjoy the gift of sight will also live to enjoy a large disability expectancy. Art Blaser Orange, US Human waste Municipal sewage sludge can never be safely used as a fertilizer.
Urban sewage is a toxic waste.
Chemicals contained in sewage sludge include polychlorinated biphenyls, polynuclear aromatic hydrocarbons, nonylphenols from detergents, and pesticides like lindane and dieldrine. None of which you want on soil or in food. Powerful forces in industry and government are promoting this cheap option for waste disposal under the guise of recycling. If you are not to play into their hand then you must be careful of the language you use. If it is recycling you are after, then talk first of source separation.