THE EFFECTIVENESS OF ORGANIC POLLUTANTS REMOVAL IN CONSTRUCTED WETLAND WITH HORIZONTAL SUB-SURFACE FLOW

This paper presents the results of the research work related to the removal efficiency from wastewater organic pollutants and suspended solids at HSSF (horizontal subsurface flow) construcred wetland. The average effectiveness defined as loss of value COD in wastewater has reached 77%, for BOD5 -80% and TOC -82%. The effect of seasonal temperature changes and the period of plant vegetation and rest on the effectiveness of wastewater treatment were also analyzed. The results of the presented research showed a decrease in the efficiency of removing organic pollutants from wastewater and suspended solids in the autumn and winter. During the vegetation the object in Malyszyn has been characterized by the effectiveness of wastewater treatment at the level of 78% for COD, 82% for BOD5, and in the non-vegetation period the effectiveness has decreased up to 75% for COD and 74% for BOD5. During the plants growth the total suspension was removed in 88%, whereas during the plants rest efficiency of removing lowered to 69%.