EFFLUENT TREATMENT OF PAY-TO-FISH IN CONSTRUCTED WETLAND SYSTEM

Abstract

The use of efficient design and low cost has been applied intensively in Europe and the United States through the constructed wetland systems – CWS and gradually in other countries in the past three decades. Given this trend, this study aimed at verifying the effectiveness of this type of treatment for effluent from fish-pay, located in the basin of the Corumbatai River. Prototypes were built simulating CWS with horizontal subsurface flow and hydraulic retention time (HRT) given in 2 days, checking its efficiency with or without aquatic macrophytes as Salvinia sp and Eichhornia crassipes and/or aggregate and soil. For simulation of the tanks of fish-pays, have been created fish Nile tilapia (Oreochromis niloticus) into the reservoir of 1,500 controlling certain environmental factors. Three treatments were used with three different replicas each and analyzed through regular collections. The highest efficiencies on the reduction were recorded as total alkalinity, nitrite, ammonia, total nitrogen, material in suspension, chemical oxygen demand (COD), apparent color and turbidity. To further reduce phosphorus there is a need for greater control of environmental factors to the system used. The more efficient treatment system was soil-containing filter combined with the aquatic.