Ferric Nitrate suppresses internal phosphorus loading in Municipal River

摘要

The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism.In situ laboratory studies were carried out in simulated reactors to evaluate the potential of ferric nitrate for remediation municipal river sediment.Ferric nitrate could greatly improve the ability of bio-treatment properties for sediment.Two dose remediation experiment of ferric nitrate (70g and 35g per square meter) was carried out lasting 28 weeks.Observations showed that ferric nitrate could suppressed the release of phosphorus from the sediments.At the same time the TN concentration could reduce to common level compared to blank reactor by denitrification.As a whole the dose of 35g per square meter ferric nitrate is better.The results suggest that knowledge of a municipal river's nitrogen budget may be a useful tool in the design of municipal river remediation efforts.