Parasite ova in anaerobically digested sludge
The Metropolitan Sanitary District of Greater Chicago produces anaerobically digested wastewater sludge from a 14-day continuous-flow process maintained at 35 degrees Celcius. Some of the sludge is ultimately applied to strip-mined lands in Central Illinois (Fulton County) as a soil conditioner and fertilizer. Parasitic nematode ova were isolated from freshly processed samples, as well as from samples collected from storage lagoons, using a system of continuous sucrose solution gradients. The mean number of ova per 100 g of dry sludge was 203 Ascaris spp., 173 Toxocara spp., 48 Toxascaris leonina, and 36 Trichuris spp. An assessment of the viability of these ova was determined by subjecting the ova to conditions favorable for embryonation. Recovered ova were placed in 1.5% formalin and aerated at 22 degrees Celcius for 21 to 28 days. Development of ova isolated from freshly digested sludge occurred in 64% of the Ascaris spp., 53% of the Toxocara, 63% of the Toxascaris leonina, and 20% of the Trichuris spp. Viability was also demonstrated in ova recovered from sludge samples held in storage lagoons for a period of up to 5 years; embryonation occurred in 24% of the Ascaris spp., 10% of the Toxocara spp., 43% of the Toxascaris leonina, and 6% of the Trichuris spp. (Refs. 24).
- OSTI ID:
- 5102492
- Journal Information:
- J. - Water Pollut. Control Fed.; (United States), Vol. 53:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SLUDGES
HEALTH HAZARDS
WASTE WATER
ANAEROBIC DIGESTION
CHICAGO
ENVIRONMENTAL EFFECTS
FERTILIZERS
GROUND DISPOSAL
ILLINOIS
NEMATODES
OVA
PARASITES
VIABILITY
ASCHELMINTHES
BIOCONVERSION
DIGESTION
FEDERAL REGION V
GAMETES
GERM CELLS
HAZARDS
HELMINTHS
HYDROGEN COMPOUNDS
LIQUID WASTES
MANAGEMENT
NORTH AMERICA
OXYGEN COMPOUNDS
PROCESSING
USA
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER
570000* - Health & Safety