Flaky Mindongnan medicinal stone was used to study its inhibition effect on nitrogen and phosphorus from contaminated sediment.The results showed that the medicinal stone was able to inhib-it the release of endogenous nitrogen and phosphorus significantly from the black and odorous water body.When the coverage of medicinal stone reached more than 8 kg·m-2 and the flow rate did not exceed 0.1 m·s-1,the overlying water was able to fulfill the Class Ⅳ water quality standard upon 488 h of in situ covering of the sediment.The results showed that the adsorption process of medicinal stone on nitrogen and phosphorus conformed to Langmuir,Freundlich isotherm isothermal model,and the adsorption type was single-layer chemical,physical adsorption with multi molecular layer,respec-tively.Finally,a flow field concentration field coupling model was established based on the diffusion and migration law of pollutants.The average relative errors between the predicted nitrogen and phos-phorus release amount of the model and the experimental data were 0.235 and 0.010,respectively.This indicates that the model is accurate and reliable in calculating and predicting nitrogen and phos-phorus release.
关键词
原位覆盖/黑臭水体/闽东南麦饭石/吸附过程/氮磷释放
Key words
in situ coverage/black and smelly water/Mindongnan/adsorption process/nitrogen and phosphorus release
维普
万方数据