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Study on the Removal of Nitrate Nitrogen Using Ion Exchange/Biological Denitrification Combined Technology

Author: NiTao
Tutor: LiuZuLiang
School: Nanjing University of Technology and Engineering
Course: Chemical processes
Keywords: Groundwater Nitrate nitrogen Ion exchange resin Biological nitrogen removal Combined process
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 83
Quote: 0
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Abstract


Groundwater nitrate nitrogen pollution has become a global environmental problem . Nitrate in groundwater treatment technology mainly include physical , chemical and biological methods . The method of the present experiment will use two methods for ion exchange and biological denitrification combined process . LSI - 106A -type resin used in the experiments were purchased from Xi'an Xiao Lan Technology Co., Ltd. . Experiments to determine the performance parameters of the LSI-106A type resin , in the preferred operating conditions , the resin on the influent concentration of 50mg / L of nitrate nitrogen removal efficiency of 38.4% , the selective adsorption of the resin is poor ; self - enrichment domesticated autotrophic anaerobic microorganisms, experimental verification , static environment , the domestication of microorganisms in 4h 50mg / L of nitrate nitrogen removal efficiency of more than 90% ; when the C : N : S = 2 : 1:7, pH = 7.0, a temperature of 30 ° C , flow rate 10ml/min stable operation of 100mins , biological nitrogen removal efficiency dropped to 31.6% . Two processes independent of 50mg / L nitrate nitrogen removal can not reach a predetermined concentration . Ion exchange resin and both biological nitrogen removal process combination , to explore the removal efficiency of nitrate nitrogen . Studies have shown that : at 30 ℃ , when the C : N : S = 2:1:7 , pH = about 7.0 , at a flow rate 6BV/hr ( 10ml/min ) , the ion exchange / biological denitrification combined process optimum the low concentration ( 20 mg / L ) nitrate nitrogen pollution water samples down to 10 mg / L or less , to meet drinking water standards of the World Health Organization ; biological nitrogen removal / combination of ion-exchange process , the concentration ( 50 mg / L ) nitrate nitrogen pollution in water samples down to 20 mg / L or less , to meet our drinking water regulations concentration .

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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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