Development Of Sediment Improver And Its Influence On Growth Of Potamogeton Crispus L.

Sediment remediation technology in original place is one of the effective means to solve the continuous deterioration of the urban river sediment and water.In order to explore remediation technology in original place.This paper takes Tianjin University outer black and smelly river as the research object,using sediment slow-release compounds by myself repair the pollution river.By this means we explore the repair mechanism of sediment slow-release compounds on black and odor sediment.On this basis,when the sediment was repaired by sediment slow-release compounds,we plant the Potamogeton crispus and explore the effect of sediment slow-release on the growth of potamogeton crispus,which provide technical support for chemical remediation and bioremediation combined remediation technology.The main conclusions are as follows:?1?We optimized composition and dosage of oxygen release compounds.It have a best effect on sediment remediation when calcium peroxide and calcium nitrate in the molar ratio of 1:1.After 30 days of experiment,the oxidation-reduction potential?ORP?,dissolved oxygen?DO?and pH increase 254 MV,3.26 mg/L and 2.13.It have a good removal effect to TN,NH₃ and organic in the Overlying wate,its removal rates were 6.15%,91.46%and 19.12%.The NO₃-N removal rates is increase 15%.Sediment has an obvious improvement when using calcium peroxide and calcium nitrate and Biological growth promoting repaired the sediment.The color of sediment become brown from black.?2?We optimized the dosage of slow-release compounds.we take the bentonite as the research object.We compare the oxygen release rate of slow-release compounds.It is concluded that the release rate is decreased and the release cycle is prolonged after the oxygen release compounds is Slow-released.In the closed vessel of 25 degree,when the dosage of slow-release compounds was 2.4 g/L,the release rate of sediment slow-release compounds was 48.47%lower than that of the oxygen release compounds.In the same condition,the effect of the sediment slow-release compounds was lower than improving agent in the pH.In the pH,the slow-release compounds rose to 9.67 within 8 hour,but the oxygen release compounds rapidly increased to 10.8 in the water.?3?We expored the affect sediment slow-release compounds to the Potamogeton Crispus.Both sediment slow-release compounds and Potamogeton Crispus can imfact on nitrogen of the overlying water.But combination of sediment slow-release compounds and Potamogeton Crispus make an great influence,which make the overlying water reduced more than 60%and was higher than the use of sediment slow-release compounds.When the sediment was treated 10 day by sediment slow-release compounds,planting Potamogeton Crispus had better remediation effect.Sediment slow-release compounds.when Sediment slow-release compounds was used 10 days after planting Potamogeton Crispus,which make the overlying water NH₃-N concentration decreased by 49.46%and the TOC degradation reached 36.91%.