Constructed wetlands aided with bio-preparation to neutralize wastewater from a small fruit and vegetable processing plant with high load pollutants

The research was carried out for real wastewater collected directly from a fruit and vegetable plant located in north-eastern Poland. Effectiveness of organic matter metabolism expressed as BOD5, COD, total suspended solids depending on the load of pollutants and bio-preparation, was determined. The use of bio-preparation in the constructed wetland allowed to increase the efficiency of wastewater treatment throughout the research period: for BOD5 by 94% in deposit with bio-preparation and by 87% in deposit without the addition of bio-preparation; however, for COD – by 93% in deposit with the addition of bio-preparation and by 87% in deposit without bio-preparation added.