Reduction efficiency of the number of pollution indicator bacteria in sewage waters treated in fish ponds
1995
Niewolak, S. (University of Agriculture and Technology, Olsztyn (Poland). Dept. of Ecology) | Tucholski, S. (University of Agriculture and Technology, Olsztyn (Poland). Dept. of Fisheries)
Domestic sewage and that from fruit and vegetable processing which enter the city sewage treatment plant were purified in a system of four fish ponds and in water outflowing from ponds into the river. Most of the bacteria were reduced in 50-93% in the pond 1. In the remaining ponds, any greater reduction was only noted for the total number of bacteria on nutrient agar at 37 deg C; for total and fecal coliforms and the number of fecal streptococci. Most of the bacteria were reduced when sewage was flown through all four ponds. In the water outflow from ponds, the average reduction of the numbers of bacteria on nutrient agar at 20 and 37 deg C, of the total and fecal coliforms and fecal streptococci, amounted to 93-99 percent
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