ESTIMATING PHOSPHORUS REMOVAL IN LAKES USING MARSH WETLANDS

摘要

The objective of study was to develop a modified simplest seasonal model that predicts phosphorus removal efficiency for lakes using marsh wetland system using lake waters. The proposed model calculates the wetland removal efficiency and total outflow phosphorus (TP_out) concentration as a function of the soluble and nonsoluble reactive phosphorus (SRP and NSRP respectively) while considering the accumulation mechanisms. The observed and predicted TP_out concentrations compared reasonably which suggest that empirical models can be adapted to estimate the phosphorus removal efficiency of the marsh wetlands. The results also indicate that TP_out concentrations decreased exponentially with time throught the wetland and decreasing the surface hydraulic loading rate of the system would increase the removal efficiency of phosphorus. It was observed that about 78/100 of the total phosphorus and 77/100 of the soluble phosphorus content within the water column was removed with about 19/100 of the total phosphorus removed within the first 5 days (13/100 of the system detention time).