Investigations with wastewater from small abattoir were carried on hybrid constructed wetland systems. Mean COD of wastewater reached 3000 gO2∙m-3 and concentration of Ntot was about 400 g∙m-3. The main problem was sufficient removal of NO3-N and Ntot. In order to intensify denitrification, a part of effluent from the vertical bed was recirculated to the settling tank. Effectiveness of Ntot removal on the plant raised along with the rise of recirculation level and obtained for 100, 150 and 200 % respectively 85,7; 91,9 and 96,6 %. The main contamination of wastewater from small fruit-and- vegetable processing plant consist of organic substance (to 10000 gO2∙m-3 as COD). The bed with vertical flow built of various fractions of sand and with fully developped reeds was found very effective in its removal. Sufficient results were obtained with loading of the bed up to 90gCOD∙m-2∙d-1. ...
The paper presents results of research concerning changes in total phos-phorus concentrations from outflow from following beds of constructed wetland in Paszkow. There was analyzed domestic wastewater which was supplied to the four beds made as constructed wetland. The beds were designed with horizontal subsurface flow in a mixed config-uration (serial - parallel). The evaluation assessed the composition of domestic wastewater supplied to the beds and as well as physico-chemical composition of the outflows. The research was conducted during July 2008 - March 2011. It was found that the average treatment efficiency for total phosphorus was at 40,0 %, with the highest annual treatment effects were observed for bed no.1. The average concentration of total phosphorus in the effluent discharged to the receiver was 4,4 mgPdm-3. Due to requirements to be met by the outflows form wastewater treatment plants for P.E < 2000, the wastewater treatment plant meets the conditions only for values of BOD5 and COD. In the case of the suspension exceeded to the limit values were observed during whole research period.
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