Combining UASB technology and constructed wetland for domestic wastewater reclamation and reuse

• Published in: Water Science & Technology: Water Supply Vol. 3; no. 4; pp. 201 - 208
• Main Authors: El-Khateeb, M A, El-Gohary, F A
• Format: Journal Article Conference Proceeding
• Language: English
• Published: London IWA Publishing 01.01.2003
• Subjects: Anaerobic treatment; Aquatic plants; Artificial wetlands; Design optimization; Domestic wastewater; Effluents; Egypt, Arab Rep; Environmental conditions; Flow; Freshwater plants; Gravel; Load distribution; Loading rate; Mineral nutrients; Nutrients; Organic loading; Planting; Planting density; Reclamation; Removal; Rhizomes; Sludge; Storm seepage; Surface flow; Typha latifolia; Upflow anaerobic sludge blanket reactors; Wastewater; Wastewater renovation; Wastewater reuse; Water quality; Water reclamation; Wetlands; Europe, Mediterranean Region; MED, Egypt, Arab Rep; Egypt, Arab Rep
• ISBN: 9781843394570; 184339457X
• ISSN: 1606-9749; 1607-0798
• DOI: 10.2166/ws.2003.0063

The enhancement of water quality by constructed wetland systems is increasingly being employed throughout the world. For this study two treatment schemes consisting of an Up-flow Anaerobic Sludge Blanket (UASB) reactor followed by either subsurface flow (SSF) or free surface flow (FSF) constructed wetlands have been investigated. The common macrophyte in Egypt Typha latifolia (cattail) was used at a planting density of three rhizomes/m super(2). To evaluate the role of plants in the treatment process, an unplanted gravel bed identical to the SSF unit was operated as control. During the study period, the wetlands were fed with the UASB effluent at an organic loading rate ranging from 17.3 to 46.8 kg BOD sub(5)/ha times d (55.1 to 134.6 kgCOD/ha times d). Effectiveness of the system for the removal of key constituents (COD, BOD, TSS, nutrients and FC) has been investigated. The results showed that, the level of COD sub(tot), and TSS in the final effluent of SSF was lower than that of FWS. Subsurface flow wetland has demonstrated higher overall efficiency than the unplanted control. FC reduction reached 4 log units. Further studies are on-going to optimize the wetland design under local environmental conditions.