Experimental Study On Repair Grand Canal In Yangzhou Sediment Covering The Combination Of Technology

Along the Grand Canal segment serious eutrophication, sediment overlying waterpollution, thus inhibiting the release of nitrogen and phosphorus in the sediment into thewater body is a priority. In this thesis, the main contents of the test coverage techniqueto repair along the Grand Canal sediment. Test is divided into five parts, includingdifferent coverage carrier under anaerobic conditions inhibit the release of nitrogen andphosphorus in the sediment, biofilm zeolite and sand combination of technology toinhibit the release of nitrogen and phosphorus in the sediment under anaerobicconditions; biofilm bacteria zeolites inhibition of sediment in nitrogen; different biofilmmanner zeolite on the inhibition of nitrogen in the sediment; research to hang filmzeolite continuing denitrification performance; ancient canal field test.(1) fine sand, modified zeolite, calcite, the biofilm zeolite and zeolite these types ofcoverage carrier sediment, the inhibition rate of total phosphorus in the sedimentdescending order: fine sand> modified zeolite> calcite> biofilm zeolite zeolite. Finesand on the inhibition of the effect of sediment total phosphorus best inhibition rate was24.65%; inhibit the release of sediment total nitrogen descending order: biofilm zeolite>modified zeolite> zeolite> fine sand> calcite. Zeolite biofilm inhibitory effect of totalnitrogen the best inhibition rate was57.58%.(2) the sand joint biofilm zeolite covered sediment, sand covering strength is small(2kg/m~2), late test can not inhibit the release of total phosphorus; When the sandcovering intensity8kg/m~2, the total the phosphorus inhibition rate of about50%. Whenthe sand covering strength2kg/m~2, TN inhibition rate of40%-62%, when the intensity of sand covered10kg/m~2, TN inhibition rate of58%-64%.(3) of inoculated strains HF3+HF7biofilm zeolite on the inhibitory effect of thesediment nitrogen in the best from the17d total nitrogen concentration, the magnitudeof change is not large; from17d to39d total nitrogen concentration from5.57mg/Ldown2.53mg/L. The overlying water total nitrogen concentration was significantlylower than other bacteria biofilm zeolite.(4) Test results show that the the zeolite coverage after20days continuous aerationbiofilm on total nitrogen concentration of the overlying water increased to11.23mg/Lthe biofilm without aeration and seal hanging total nitrogen concentration of the filmgradually decreased to3mg/L or so. Visible seal hanging film and not aerated biofilminhibition of sediment nitrogen significantly better than continuous aeration biofilm.(5) total nitrogen concentration conical flask biofilm zeolite1d from81.02mg/Lreduced to14.91mg/L, total nitrogen removal rate of81.60%, zeolite in situregeneration rate was44.5%.