Ecological and hygienic conditions for agricultural use of sewage sediments

aprovechamiento de desechos bioaccumulation biological contamination cadena alimentaria chemical contamination contaminantes contamination biologique contamination chimique crop residues crops cultivos engrais organique fertilisation fertilizer application food chains grain granos heavy metals helminthe helminths helmintos lodos residuales lutte antipollution metales pesados organic fertilizers ova ovule plante de culture polluant pollutants pollution control residuos de cosechas sewage sludge waste utilization