Zeolite Modified And The Optimization Of Hanging Film And Repair The Sediment Experimental Study

Coverage zeolite is effective way to control release ammonia nitrogen from thepolluted sediment, however, the natural zeolite in situ regeneration ability is limited, itis the bottleneck of zeolite cover for repair polluted sediment.This paper in order toimprove the zeolite adsorption potential and in situ regeneration rate, study the acid,alkali and salt modified to improve zeolite adsorption potential of zeolite modificationmethod; Explore the influence factor such as attaching film time, attach micorobialmembrane temperature, aeration mode to the modified zeolite in situ regeneration rate.On this basis, study the releasing characteristics of polluted sediment in yangzhouancient canal, and carry out the zeolite covers experimental for repair the sediment.The main research conclusions as follows:1. When the modification temperature at30℃, sodium chloride modified zeoliteadsorption ability to ammonia nitrogen (8.0mg/g) is greater than the adsorptioncapacity(7.8mg/g) when the modification temperature at50℃, A combination offactors that under the conditions of the modification temperature is30℃, concentrationof sodium chloride is1.0mol/L can improve the adsorption of natural zeolite.Othermethods such as hydrochloric acid, phosphoric acid, sodium hydroxide, strong acid,strong alkali alone modification or using a combination of sodium hydroxide andsodium chloride were all reduce the inherent adsorption potential of natural zeolite.2. Attaching film time and inoculation amount has a certain influence to the in situregeneration of sodium chloride modified zeolite, the results show that the attachingfilm time is greater than4d, inoculation amount is more than1/20are all ok. Thezeolite in situ regeneration rate was43%when attach micorobial membrane temperatureis30℃, is higher than the in situ regeneration rate when attach micorobial membrane temperature at20℃and50℃(respectively0%and33%), zeolite in situ regenerationrate under airtight conditions is slightly higher than the corresponding values ofcontinuous aeration.3. per gram sediment release ammonia nitrogen maximum is0.072mg when pH is3.5, showed that ammonia nitrogen in the sediment release easily under acidicconditions. per gram of sediment release ammonia nitrogen maximum is0.11mg whenratio of sludge and sewage (200g:5L), showed that litter ratio of sludge and sewage ismore advantageous for release of ammonia nitrogen. per gram sediment releaseammonia nitrogen rate maximum to25mg/(g·d) when the sediment weight is200g.4. Cover zeolite to repair the ammonia nitrogen of sediment release experiment,visibly, modified and hanging membrane zeolite reduce quantity of nitrogen (5.9mg/L)is2.3times of natural zeolite reduce amount of nitrogen (2.6mg/L).