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Research on Pretreatment Techology for ADC Ammonia-Nitrogen Wastewater

Author: YangLeiBo
Tutor: WenLiXiong
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Ammonia Nitrogen Wastewater Biurea Chlorine dioxide Too - potassium bisulfate salt complexes Pretreatment
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 41
Quote: 0
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Abstract


In recent years, a large amount of waste water and solid waste generated due to the process of industrial production and people's life, leading to deteriorating ecological environment, environmental issues has risen to global problems. Especially the pollution of the water environment, the ammonia wastewater emissions caused serious harm to the natural world water environment. In water high concentration of ammonia will lead directly to the eutrophication of water quality, and serious damage to the ecological balance of water organisms. Ammonia in the water environment are the main pollutants from the chemical industry, metallurgy, coal gas, coke, fertilizer, leather boots, landfill and industrial waste water as well as agricultural and domestic wastewater. Where ADC foaming agent industrial wastewater is one of the important sources of ammonia wastewater, its composition is complex and difficult to governance, especially organic wastewater containing ammonia is more difficult to degrade, and therefore has important practical significance to study the wastewater treatment technology. In this paper, chlorine dioxide and monopersulfate The potassium compound salt processing ADC foaming agent the organic ammonia nitrogen wastewater, experiments to explore the best process, the main work is as follows: 1, the condensation of urea with hydrazine hydrate under acidic conditions prepared by the method biurea. Find the relevant literature, analysis of the existing production technology combined with their own exploration of experimental optimization biurea condensation process, to improve the utilization of hydrazine hydrate, in order to achieve the purpose of improving the yield. Best prepared by condensation of the process as follows: based on the amount of hydrazine hydrate added, the actual addition amount of urea, and hydrazine hydrate molar ratio: 4:1, the reaction pH was kept at 3-5, the reaction temperature was 105 ° C and with stirring, The yield biurea 97.3%. 2 chlorine dioxide treatment ADC foaming agent organic ammonia wastewater main factors, focusing on the principle of oxidation of chlorine dioxide (C102) and the application of its wastewater treatment effect. The experiments show that chlorine dioxide can be effectively dealt organic ammonia wastewater, and in the entire process, the chlorine dioxide and the organic ammonia oxidation reaction occurs. 100 mL (initial CODCr 667.6 mg / L) organic ammonia wastewater treatment, the optimum processing conditions, namely dioxide amount of chlorine added 10 mL, initial pH 11, the reaction temperature is 60 ° C, with stirring reaction 30 min, CODCr 142.0 mg / L, the removal rate of 78.7%. Although chlorine dioxide ADC foaming agent organic ammonia wastewater treatment effect, but did not meet the state emission standards. 3, an inspection tour of a potassium bisulfate salt complexes of ADC production wastewater the urea, hydrazine hydrate biurea, three organic ammonia oxidation pretreatment process. By changing a composite salt of potassium hydrogen sulfate added in an amount, reaction temperature, reaction time and the initial pH value, such as to obtain the best oxidation pretreatment process conditions. The results indicate that potassium monopersulfate can effectively degrade the organic ammonia the ADC production of wastewater, when a hydrogen sulfate complex salt added 100 mL (initial CODCr to 702.99 mg / L) organic ammonia wastewater 2.5 g, reaction temperature is 60 ℃, the reaction time was 10min, initial pH 9:00 the organic ammonia CODCr was 33.1 mg / L, the removal rate of 95.3%.

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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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