DONALD M. MCCLEAN, M.D., F.R.C.P.(C)
Quality of the aquatic environment, especially freshwater lakes and rivers, has become a major issue of public concern during the past decade. Current North American procedures for disposal of effluent, after primary treatment to remove suspended solids, or in some instances after secondary treatment to remove additional solids and reduce biochemical oxygen demand, results in the discharge of huge quantities of fluid rich in nitrogen and phosphorus compounds into lakes and rivers through sewer outfalls. Microbial pathogens, especially viruses, are not regularly inactivated by primary and secondary treatment of sewage (1-4), thereby permitting their discharge with the effluent. This promotes
MCCLEAN DM. Sewage Irrigation: Health Benefit or Hazard?. Ann Intern Med. ;82:112–113. doi: 10.7326/0003-4819-82-1-112
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Published: Ann Intern Med. 1975;82(1):112-113.
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