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Experiment Studys on Adsorption of Ammonia-Nitrogen from Leachate onto Fly Ash

Author: WangJianBo
Tutor: ZengZhengZhong
School: Lanzhou University
Course: Environmental Engineering
Keywords: Fly ash Leachate Ammonia Pretreatment Adsorption kinetics
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 160
Quote: 2
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Abstract

Sanitary landfill method is the main treatment methods of garbage at home and abroad, and its derivative products caused by leachate pollution is a major environmental problem sanitary landfill, the existing solid waste landfill pollution control standards GB 16889-2008 been garbage landfill water pollutant discharge concentration limits made strict rules, the traditional wastewater biological treatment of leachate has been unable to achieve compliance treatment and disposal, leachate treatment research has become the research focus of the current domestic and international wastewater treatment. Landfill leachate is a high concentration of organic refractory wastewater, the high concentration of ammonia nitrogen content is one of the characteristics of the leachate water quality, but also one of the reasons difficult to biological treatment leachate. The more ammonia presence of substances not only makes the leachate C / N is too small, resulting in nutritional imbalance, increase the difficulty of the leachate biochemical treatment, and ammonia inhibition of microbial activity will. Biological treatment is a combination of leachate treatment process approach, before processing can effectively reduce the concentration of ammonia in the leachate, it will be applied more widely. Therefore, topics to reduce the ammonia concentration of the leachate as a starting point, better application of adsorption and inexpensive fly ash and modified fly ash leachate ammonia adsorption test, designed to search for a ammonia in the leachate pre-treatment methods, and the application of the method to provide a theoretical basis. Fly ash modified conditions preferred experiment showed NaOH wet modified fly ash with NaOH concentration of 1 mol / L the CaO fire method modified fly ash CaO mixing ratio of 20%; reform fly ash in the posterior than the surface area from 10.1m2 / g, respectively, up to 15.3m2 / g, 13.4m2 / g. The application of fly ash and modified fly ash adsorption treatment of ammonia in the leachate, and achieved good results. Test for optimization of the proceeds original fly ash, NaOH modified fly ash, CaO modified fly ash leachate dosing than 2g/10mL 1g/10ml, 1g/10ml; optimal dosing than under the conditions of adsorption equilibrium time of 180min, 150min, 180min, three kinds of fly ash adsorption equilibrium adsorption of ammonia units were 8.743mg / g, 12.360mg / g, 11.024mg / g, the removal rate of more than 40% ; estimate, due to the removal of fly ash and modified fly ash leachate ammonia, leachate C / N ratio increased by 2-2.5 times, effectively increases the C / N ratio can be as the pretreatment measures before the biological treatment of leachate. The original fly ash by the ammonia adsorption process temperature, pH, single factor experiment showed that under the conditions of temperature from 288K to 315K, the removal rate reached a peak at 298K; removal rate was the \Pseudo-first-order kinetics, pseudo-second-order kinetic equation and Elovich kinetic equation fitting analysis, by comparison, the pseudo-second-order kinetic equation are three kinds of adsorption process on three fly ash adsorption of ammonia better description; using the moving boundary model describes three kinds of fly ash adsorption behavior can be drawn film diffusion is the original fly ash adsorption leachate ammonia nitrogen was mainly controlled by the spread of the gap are two change sexual Fly Ash leachate ammonia control step; Dunwald-Wagner formula method to estimate the effective diffusion coefficient of the adsorption process Dc 2.2686 × 10-7cm2 / s, 3.1480 × 10-7cm2 / s, 2.9160 × 10-7cm2 / s. The experiment showed that NaOH modified fly ash leachate ammonia removal, followed by of CaO modified fly ash and original fly ash, modified the cost will increase in view of the fly ash, recommend direct application of the original fly ash leachate pretreatment, can also achieve better results.

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