Integrated laboratory system consisted of three stages - activated sludge reactor, biofilter
and subsurface vertical flow wetland was used to treat two types of wastewaters differed
in their generation and pollution. Wastewaters from a pig farm as well as from a landfill
site for domestic wastes were used in the experiments. The BOD/COD ratio of the
wastewaters from a pig farm and from the landfill leachate was 0.5 and 0.07, respectively.
In the first stage of the integrated system was achieved COD removal (48 % for the piggery
wastewater for 3 days and 62.3 % for the landfill leachate after 4 days). BOD removal
(55.6 %) for the piggery wastewater was achieved in 3 days and 24.9 % - for the landfill
leachate after 4 days. The decreasing of organics at aerobic conditions was accompanied
with the ammonium ions decreasing - 1.5 times for the piggery wastewater and 4 times for
the leachate. In the second stage - biofilter without aeration, an additional organic loading
decreasing was achieved. The COD decreased from 820.9 mg/dm3 to 274.3 mg/dm3 for
piggery wastewater and for the leachate - from 869.5 mg/dm3 to 423.6 mg/dm3. The BOD
values decreased from 384.1 mg/dm3 to 106.8 mg/dm3 for the piggery wastewater and for
leachate - from 117.8 mg/dm3 to 57.4 mg/dm3. The ammonium ions were eliminated from
both types of wastewaters. In the third stage (subsurface vertical flow wetland) the
emission standards for discharge into the sewage collection systems or into the water
bodies are met.
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