Constructed wetlands to help recovery of effluent dominated streams: application to ozonated and non ozonated treated effluents

The paper reports the results of comparative trials carried out at demonstrative and pilot scale using constructed wetlands for the final polishing of treated effluents (ozonated and non ozonated) which are discharged into a small stream, often dry, whose flow is chiefly made of the effluents themselves. The effluents fed to experimental constructed wetlands had comparable quality for the chief parameters. The removal percent was higher in the case of ozonated effluents for total phosphorus and total nitrogen, especially due to the higher concentration of oxygen, while COD and TSS reval were comparable in the two cases.