Evaluation The Efficiency Of Constructed Wetland Treatment Technology On The River's Beds For Reducing It Is Organic Load

Abstract

In the last few decades, constructed wetlands have spread across the globe

as a mean of treating water pollution with engineering processes that harness plants, soils, and their bacterial communities. The purpose of this research is to investigate the technology of constructed wetlands as an effective solution to reducing or treating water pollution rates. In this study, an experimental reedbeds treatment plants with two subsurface flows near the Barada River was designed and evaluated for its effectiveness and capacity to treat the river water pollution.

Research Objective:

 This research aims to evaluate the effectiveness of the constructed wetland technology in treating wastewater inflow from the river to the  allowable thresholds of organic load. Selected design and operational constraints were used to construct of an experimental treatment plant based on reference studies and international experiences that used this technique for achieving the technical and economical sustainability.

Materials and Methods:

 To obtain optimal results and ensure their validity, 36 samples were tested divided into 12 samples before two wetland plants, and 24 samples afterwards, divided equally into 12 samples after each plant. It was the researcher's objective to test the effects of the hydraulic surface loading rate on the treatment of water pollution according to the two types of subsurface flow adopted in the two plants with a constant residual time. Therefore , he tested these samples daily with a hydraulic surface loading of 6 and 8 liters per square meter per minute and for a duration of 3 hours as residual time.

Results:

The results showed that the average removal rate of (COD, BOD, TN, N-NH4, N-NO3, TP) under hydraulic surface loading of 8 liters per square meter per minute was (67%,74%,37%,63%,28%,59%) respectively for the horizontal subsurface flow.

 In other hand, it was (58%,68%,32%,42%,30%,48%)respectively for the vertical subsurface flow. Under hydraulic surface loading of 6 liters per square meter per minute, the average removal percentage was (83%,86%,57%,76%,48%,68%) respectively at the horizontal subsurface flow, and it was (80%,85%53%,61%,50%,57%), respectively for the vertical.

Conclusion: Considering the limitations of this study, we conclude that the application of this technique is advantageous in treating water pollution caused mainly by sewage water. Besides its economic benefit, it is also less expensive than other technologies.