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Treatment of Nitrate-contaminated Water Using the Technology of Intermittently Ion-exchange and Electro-regeneration

Author: BiJingJing
Tutor: PengChangSheng
School: Ocean University of China
Course: Environmental Engineering
Keywords: Ion exchange Electrical regeneration Nitrate pollution Groundwater
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 33
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Abstract


As one of the important sources of drinking water, groundwater play an increasingly important role in the production and life. However, the monitoring results indicate that, in recent decades increasingly serious nitrate pollution in the groundwater. Closely related to human health, the nitrate pollution of countries has attracted universal attention. Electrodynamics (EK) and permeable reactive barrier (PRB) technology has the advantage of continuous in situ processing, the price is relatively cheap compared with the traditional groundwater pollution treatment technology; addition to reducing the surface treatment facilities, reducing the exposure of pollutants and environmental perturbations. EK and PRB test nitrate removal the filled Fe 0 PRB media in the removal of nitrate process will generate more toxic NH4 EK governance cycle very long, often take months or even longer. This study intends to combine the respective advantages of EK and PRB test first screened efficient adsorption of NO 3 - anion exchange resin, and give full play to PRB filling medium water NO accelerated migration and concentrated in NO 3 - PRB media 3 the efficient absorption features - and EK the resin regeneration, restore the exchange capacity, to achieve the efficient and safe handling of the nitrate. In order to select the appropriate the adsorption fill media, the first strong base styrene anion exchange resin 201 × 7 and nitrate selective resin D407 adsorption of water NO 3 - effect, two anion resin with cation exchange resin (001 × 7 and D001) under the conditions of different ratio of mixed adsorption effects and water NO 3 - SO 4 2 - Cl - NO 3 - coexistence case resin adsorption NO 3 - of the impact of the research, found: 201 × 7 have a larger amount of adsorption than D407, both the amount of adsorption were 59 mg NO 3 - / mL resin, and of 25 mg NO 3 - / mL resin; under the same test conditions, when yin volume ratio of 6:4, the removal rate of NO 3 - of the mixed resin is relatively high, and out of the water without NO 3 - -N detection and conductivity of less than 5μs/cm; using half the volume of the anion exchange resin to fill the lower exchange column, fill in the other half of the volume of anion resin and cation resin completely mixed exchange column upper mixed manner, the effluent pH is relatively stable, and between 6-8, and therefore behind the test in this manner is filled; resin 201 × 7 in the case of subject to the influence of interference ions, the adsorption amount is still higher than D407 should be large, and in the the actual environment, there must be interfering ions, so choose resin 201 × 7 as the exchange adsorption material is more than D407. Through a series of electrical regeneration tests showed that the adsorption saturation of mixed resin filled in a light room, after 10 hours static as well as 80-hour dynamic continuous electrical regeneration can be achieved on NO 3 - effective removal when the influent NO 3 - -N initial concentration of 50 mg / L, the effluent NO 3 - -N can be stabilized at 10mg / L or less, to meet the requirements of the standard of groundwater nitrate the resin regeneration rate can be achieved after 90 hours of continuous regeneration, 60 %. A series of experiments showed that: the intermittent exchange of ions - electrically renewable technologies can achieve water NO 3 - stability of removal, and to reduce energy consumption, to avoid due to chemical regeneration cause secondary pollution purposes.

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