Factors influencing the efficiency of constructed wetlands used for the treatment of intensive trout farm effluent

摘要: Abstract In this paper the factors influencing treatment performance of subsurface flow constructed wetlands (SSF wetlands) treating aquaculture effluents were identified and quantified. The financial impact advanced effluent with SSF was calculated. It is first long-term, commercial-scale trial wetland for from intensive trout farming, a highly diluted at very high rates (mean total phosphorous concentration 0.34 mg L −1 14.3 L s ). 12-month survey provided opportunity to generate calculation fundamentals commercial application aquaculture. Treatment efficiencies up 75–86% ammonia nitrogen (TAN), biological oxygen demand (BOD 5 ) suspended solids (TSS) achieved. daily area retention rate per square meter between 2.1 4.5 g TAN 30 98 g TSS. six cells comprising three replicated hydraulic loading groups (14.5, 6.9, 3.3 m 3  m −2  day monitored, offering possibility identify efficiency through multifactor analysis. These turned out be nutrient inflow concentration, accumulation TSS within bed, only time-dependent factor. Factors such as vegetation period fish harvesting shown significant but negligible importance. Inflow determined by production intensity, husbandry conditions, feed quality any pre-treatment effluent. Hydraulic load space budget available construction. in influenced solid fraction prior determines service lifetime. From these expenses can estimated, leading cost increase around €0.20 kg produced (less than 10% costs) therefore confirm feasibility treatment.