Recovery of low concentration ammonia nitrogen in wastewater by Na-type powder resin
PENG Fei1,2,, ZHANG Huanzhen1, HE Wenyan2, FANG Kuo2, WANG Kaijun2,, 1.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100084, China 2.State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
Abstract:The purpose of this study was to investigate the feasibility of low-concentration ammonia nitrogen in the recovery of wastewater from Na-type powder resin. Experiments were carried out using static shake flasks and dynamic resin column methods. The results showed that the ability of ammonia nitrogen adsorption by the powder resin only decreased by 5% through the pretreatment. Under neutral and acidic conditions, the removal rates of low concentration ammonia nitrogen by Na-type powder resin could reach 99%. The ammonia nitrogen removal rate increased by 20% with every increase of 2 g·L?1 resin dosage, while the adsorption capacity decreased by 2.85 mg·g?1. The presence of calcium and magnesium ions could reduce the ammonia nitrogen adsorption capacity of Na-type powder resin with the maximum decrease of 3.5 mg·g?1. Due to the same valence of potassium ions and ammonia nitrogen, the effect of potassium ions was insignificant. The adsorption of ammonia nitrogen by Na-type powder resin accorded with Langmuir adsorption isotherm. The adsorption process of Na-type powder resin accorded with quasi-secondary kinetics. According to the experimental results, the static operation mode of the Na-type powder resin was suitable for the recovery of low-concentration ammonia nitrogen, but the dynamic operation mode led to a shorter saturation time of the powder resin, which indicated less effectiveness. Therefore, further research will be need on other more economically feasible modes of operation. Key words:powder resin/ ammonia nitrogen/ adsorption isotherm/ quasi-secondary dynamics.
图1不同初始氨氮浓度下预处理对氨氮去除率和吸附容量的影响 Figure1.Effect of pretreatment on ammonia nitrogen removal rate and adsorption capacity at different initial concentrations
图3不同初始氨氮浓度下粉末树脂投加量对氨氮去除率和吸附容量的影响 Figure3.Effect of powder resin dosage on ammonia nitrogen removal rate and adsorption capacityat different initial concentrations
SUN F Y, WANG X M, LI X Y. An innovative membrane bioreactor (MBR) system for simultaneous nitrogen and phosphorus removal[J]. Process Biochemistry, 2013, 48(11): 1749-1756. doi: 10.1016/j.procbio.2013.08.009
1.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100084, China 2.State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China Received Date: 2019-02-02 Accepted Date: 2019-05-14 Available Online: 2020-01-20 Keywords:powder resin/ ammonia nitrogen/ adsorption isotherm/ quasi-secondary dynamics Abstract:The purpose of this study was to investigate the feasibility of low-concentration ammonia nitrogen in the recovery of wastewater from Na-type powder resin. Experiments were carried out using static shake flasks and dynamic resin column methods. The results showed that the ability of ammonia nitrogen adsorption by the powder resin only decreased by 5% through the pretreatment. Under neutral and acidic conditions, the removal rates of low concentration ammonia nitrogen by Na-type powder resin could reach 99%. The ammonia nitrogen removal rate increased by 20% with every increase of 2 g·L?1 resin dosage, while the adsorption capacity decreased by 2.85 mg·g?1. The presence of calcium and magnesium ions could reduce the ammonia nitrogen adsorption capacity of Na-type powder resin with the maximum decrease of 3.5 mg·g?1. Due to the same valence of potassium ions and ammonia nitrogen, the effect of potassium ions was insignificant. The adsorption of ammonia nitrogen by Na-type powder resin accorded with Langmuir adsorption isotherm. The adsorption process of Na-type powder resin accorded with quasi-secondary kinetics. According to the experimental results, the static operation mode of the Na-type powder resin was suitable for the recovery of low-concentration ammonia nitrogen, but the dynamic operation mode led to a shorter saturation time of the powder resin, which indicated less effectiveness. Therefore, further research will be need on other more economically feasible modes of operation.