Abstract
Reuse of treated wastewater for irrigation purpose can reduce high pressure on freshwater resources. A horizontal subsurface flow constructed wetland (HSSF CW) system filled with gravel and planted with Phragmites Australia was used to treat the real wastewater at Al-Rustumia wastewater treatment plant. Some characteristics of wastewater such as biochemical oxygen demand, phosphate and total suspended solids have been monitored from 15 January until 8 July 2018. The results proved that HSSF unit has a good efficacy in the reduction of previous parameters with removal of 84.2, 55.4 and 72.7% while sulphate and total dissolved solids were less removal efficiency with 3.3 and 0.99 % respectively. The measured values of these parameters were within the permissible limits suitable for irrigation purposes.
Highlights
Constructed wetlands (CWs) are artificial wastewater treatment systems consisted of shallow ponds or channels
SSF can be classified according to their flow patterns into; a) horizontal flow (HSSF) and b) vertical flow (VSSF)
The removal efficiency of pollutants, area requirements, technical complexity, applications and costs are the main differences between the two types (23)
Summary
Constructed wetlands (CWs) are artificial wastewater treatment systems consisted of shallow ponds or channels. Sindilariu employed a HF unit that was packed with gravel and planted with Phragmites, Phalaris, and local swamp-land plants to provide treatment of trout aquaculture This system received a flow rate between 26.3 and 72 Ls-1. The main goal of this research is to investigate the ability of using HSSF CW unit planted with Phragmites australis (common reeds) for municipal wastewater treatment of AlRustumia WWTP, Baghdad, Iraq as an alternative of conventional treatment methods. This location was related with similarity in objectives and environmental circumstances between the sanitary WWTP and the CW, as well as the presence of laboratory building for achieving the planned measurements
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