Study On The Technology Of Ammonia Removal With Reconstructing Anaerobic Microbes And Its Influential Factors In Aeration Basin

The accumulation of nitrogen in the water always cause eutrophication. It's repartedthat the content of ammonia in the water has overrun the normal level in recentyears.Pollutions caused by ammonia have seriously threatened human beings' life and thebalance of ecosystem.The study on the theory and technology of nitrogen removal inwastewater treatment has been generally concerned in environmental science and thefield of engineering. There are high cost and low efficency in present processes. So weneed to study ecnomic, efficient techniques and processes that are suitable for the nationalcircumstances for nitrogen removal.For the purpose of researching ecnomic and efficient techniques in wastewatertreatment, we have presented the new technology of reconstructing anaerobic microbes inaeration basin to improve the structure and function of microbe system. The system mayhave been obviously affected by reconstructing methods, microbe proportion,theconcentration and component of pollutants and so on. The results have shown thatreconstructing anaerobic microbes in aeration basin directly has some effect,but it is notstable. And reconstruction with biofilm is available. The average removal rate of totalnitrogen has been improved to 46.6%, while that of ammonia and organic carbon hasreached 97.2% and 90.6% under the weight ratio of 2:1 between anaerobic and aerobicmicrobe. In addition, the C/N ratio in the waste water has gone up to 4.0.Aluminum is a multitarheted toxicant on micrbes. The results showed thatinstantaneous sedimentation speed had increased evidently with the rise of aluminumconcentration, and SV of activated sludges hadn't change. Aluminum had no effect onthe removal efficiency of COD, but had a great effect on the oxidation of NH₄⁺ -N. Withaluminum concentration rising, the removal efficiency of NH₄⁺ -N presented a trend of rising initially and then decreasing, which showed a negative correlation between thedeclining trend and the effect of aluminum in activated sludges on the cellular membraneof microbiota. It indicated that aluminum had the most serious interference onammonium oxidation of microbial community. The effect on ammoniumoxidingbacterium has been discussed furtherly. The results have showed that aluminum has goodeffect on removal efficiency of NH₄⁺ -N and removal content of NH₄⁺ -N in MLSS Whenthe concentration of Al³⁺ is 2.5mg/L in inflow. At the same time, ammoniumoxidingbacterium have some adaptability on aluminum. The resistance of ammoniumoxidingbacterium also reinforced in the system with larger MLSS. The permeability of cellularmembrane and the concentration of superoxide radical are all rising, whenammoniumoxiding bacterium has been stressed. Exogenous antioxidants has scavengingeffect on superoxide radical, and removal efficiency of NH₄⁺ -N has risen.