The Influence Of Ceramsite And A Certain Active Substance On The Water Quality Of The Estuary Area

The estuary of the lake is an ecological transition area where the mass exchange flux between the river and the lake is large,and the ecosystem is relatively fragile and sensitive.In this paper,the nutrient salts in the Liangtang River estuary are choosen as the research object.The water and mud,which was collected at the estuary,was used to conduct indoor experiment to simulate the removal of nutrients in the estuary area by the combined use of ceramsite and an active substance.Preliminary experiments initially explored the effect of ceramsite and the active substance on nutrients and selected the optimal combination further.A comprehensive experiment conducted based on the results of preliminary in this research.In this experiment,total nitrogen,total phosphorus,ammonia nitrogen,nitrate nitrogen,permanganate index,surface tension,dissolved oxygen,nitrous oxide,redox potential,pH in sediment water interface,and total nitrogen,total phosphorus,organic matter in the sediment were measured.The data was systematically organized and analyzed,and the mechanism of reducing nutrients for ceramsite and the active substance was investigeted.The conclusions obtained are as follows.（1）The active substance alone has no effect on the removal of nutrients;（2）During a single variable experiment in a constant temperature incubator,the type of ceramsite and the combination with the active substance was changed;the results prove that when ceramsite 1,ceramsite 2 and the active substance are mixed,it can remove the total nitrogen in the water body by 71.24%,total phosphorus by91.45%,higher than blank group 53.77%and 84.03%respectively;（3）The mass adsorped by ceramsite decreases with the increase of the dosage of ceramsite.The adsorption of ceramsite under alkaline conditions is higher than that under acidic conditions,and the adsorption capacity of ceramsite increases with the increase of the initial concentration of nitrogen and phosphorus;（4）The combination of ceramsite and the active substance can reduce the total nitrogen,total phosphorus,and organic matter content in sediments by 13.9%,11.11%,and 1.25%respectively,and the total nitrogen and total phosphorus in overlying water47.83%and 54.88%respectively.The DO concentration at the sediment-water interface was removed by 30μmol/L,the oxidation-reduction potential was reduced by 32.92 mV,and there was no significant change in N₂O and pH.