The use of constructed wetlands as an alternative form of on-site wastewater treatment in a temperate climate

摘要: It is estimated that between 40% and 60% of on-site systems in Australia are not treating domestic wastewater to acceptable levels. This study investigates the viability of constructed wetlands as an alternative form treatment domestic greywater temperate climates. A case wetland was treat from a single household, providing insight into design, construction, operational performance, hydraulic flow reed growth small-scale wetland operating Tasmania. review current literature provides into constructed wetlands, emphasising their use treatment. Interviews with officers five local government councils indicates knowledge of very limited, but great deal interest shown by the interviewed environmental health officers, who suggested they may be willing to trial within municipalities. All governments interviewed were experiencing problems accepted forms wastewater treatment. Testing over nine-month period showed pollutant removal processes were occurring across all testing parameters except ammonia and phosphorous. Significant findings would improve quality of the final effluent include importance healthy reeds deep root systems, improving Wetland prevent short-circuiting, the necessity additional pre post treatment. Greywater alone does not have sufficient nutrients trace elements sustain vigorous for common reed, Phragmites australis. combined black greywater led and healthy growth. The produced average 64 mg/L BOD5 (60% removal), 48.5 suspended solids (88% removal), 18,427 FCU/100mL faecal coliforms (99.2% 0.008 nitrite (65% 2.9 nitrate (6% 2.2 mg/L ammonia, 6.7 phosphorous, 537 pS/cm conductivity, pH 7.7. is expected mature the design improvements implemented.