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WATER RELATED DISEASES

WATER RELATED DISEASES. BRADLEY CLASSIFICATION (1977) A water related disease is one which in some way is related to water or to impurities within water Biological/Specific (water borne-Diseases) Non-Infectious/Non Specific water related Diseases. WATER-BORNE DISEASES.

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WATER RELATED DISEASES

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  1. WATER RELATED DISEASES • BRADLEY CLASSIFICATION (1977) • A water related disease is one which in some way is related to water or to impurities within water • Biological/Specific (water borne-Diseases) • Non-Infectious/Non Specific water related Diseases

  2. WATER-BORNE DISEASES • Also called Biological/Specific Diseases • Further classified into • Caused by the presence of an Infective agent • Due to the presence of an Aquatic host

  3. CAUSED BY INFECTIVE AGENTS • VIRAL • Viral Hepatitis A &E • Poliomyelitis • Rotavirus Diarrhea • BACTERIAL • Typhoid & Paratyphoid Fevers • Bacillary Dysentery • E.Coli Diarrhea • Cholera

  4. Contnd.--------- PROTZOAL • Amebiasis • Giardiasis HELMINTHIC • Roundworm • Threadworm • Hydatid Disease LEPTOSPIRAL • Weils Disease

  5. DUE TO THE PRESENCE OF AN AQUATIC HOST SNAIL • Schistosomiasis CYCLOPS • Guineaworm • Fish tapworm

  6. Non-specific/Non-infectious Water Related Diseases These diseases are due to either excess or deficiency of certain chemicals in the water(Chemical Hazards) • Lead Poisoning • Endemic Goiter • Dental Caries/Dental Decay • Fluorosis • Infantile Methaemoglobinaemia

  7. Modified BRADLEY Classification • Feco-Oral Diseases • Water Borne Diseases • Water washed Diseases • Water Based Diseases • Water Related Diseases • Water Dispersed Diseases

  8. PURIFICATION OF WATER • NATURAL METHODS • Evaporation & Condensation • Storage • Sedimentation • Oxidation • Percolation & Filtration through soil

  9. Contnd.--------- • ARTIFICIAL METHODS • PHYSICAL METHODS • Distillation • Boiling • CHEMICAL METHODS • Precipitation • Removal of Hardness & Softening • Germicides • Adsorbents

  10. Contnd.-------- 3. FILTRATION METHODS • ON SMALL SCALE • Pasteur Chamberland Filter • Berkefeld Filter • Meta & Stellar Filter • ON LARGE SCALE • Slow Sand Filtration • Rapid Sand Filtration • Desalination

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