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The Study on the Removal of Ammonia Nitrogen in Wastewater

Author: PengTao
Tutor: GaoJianFeng
School: University of North
Course: Inorganic Chemistry
Keywords: Catalytic oxidation Molecular sieve Simulation configuration Ammonianitrogen wastewater adsorption microwave
CLC: X703
Type: Master's thesis
Year: 2014
Downloads: 13
Quote: 0
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Abstract


Ammonia nitrogen in water is a hazardous substance. It can be converted to nitrate andnitrite under action of microorganisms, which are toxic to human body. Also, it consumes theAmmonia nitrogen in water is a kind of harmful substances. Under the action ofmicroorganisms it transform into nitrate and nitrous nitrogen and toxic to the human body. Itcan consume the oxygen in the water, and cause water eutrophication and the death of the fishand so on. This paper firstly uses the theories to calculate that oxide may be used to removalthe water of ammonia and carry on the experiment, and to prove the feasibility. Explore themethods of adsorption and loaded molecular sieve to improve the theoretical calculationmethods, then change the conditions to research the removal effect of different oxide underthe microwave. Experiments were carried out at normal temperature, ordinary pressure andmicrowave, under the action of catalyst, so that the sewage organic matter, ammonia and soon were oxidized into CO2, H2O and N2and other harmful substances, to achieve the purposeof purification.According to the theory to reach the activity of several oxides is MgO, NiO>Cu2O, usingMoO3>Ag2O theory, Al2O3from large to small. Then make the catalysts such as NiO, MgO,Cu2O, MoO3to test and verify the activity of above-mentioned catalyst. And the activity ofcatalyst by the confirmatory experiment is Bi2O2> MgO>NiO>MoO3>CuO>Cu2O>MnO3,Ag2O. It is consistent with the theoretical results. It is explaining that the activity and thetheoretical calculation have certain correlation, but the efficiency of these is relatively low.Then with the method of adsorption to determine, the adsorption rate of activated carbon onammonia was9.8%, the adsorption rate of the alumina on ammonia was4.6%, and theadsorption rate of ordinary zeolite on ammonia was83.1%. This is explained that theadsorption effect of artificial zeolite is better. However in the artificial zeolite supportedoxide catalyst, adsorption rate of bismuth oxide (artificial zeolite catalyst) on ammoniareached87.4%. It is higher than the adsorption rate on zeolite, but the time-consuming of this method is too long. In order to reduce the time and change the conditions, we choose theexperiment under the microwave, through the experimental study the effect of the removal ofammonia by catalyst, sensitizer, microwave heating time and solution pH. The results showthat, nitrogen removal effect is best under the pH value of the solution is10, whileadding oxidant hydrogen peroxide catalyst, oxidant copper oxide, zeolite and activatedcarbon. The removal rate of ammonia nitrogen was close to95%while the microwave powerwas750W and the radiation time was10min.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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