Study on the adsorption of nitrogen and phosphorus from biogas slurry by NaCl-modified zeolite

A NaCl-modified zeolite was used to simultaneously remove nitrogen and phosphate from biogas slurry. The effect of pH, contact time and dosage of absorbants on the removal efficiency of nitrogen and phosphate were studied. The results showed that the highest removal efficiency of NH4+-N (92.13%) and...

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Bibliographic Details
Published in:PloS one 2017-05, Vol.12 (5), p.e0176109-e0176109
Main Authors: Cheng, Qunpeng, Li, Hongxia, Xu, Yilu, Chen, Song, Liao, Yuhua, Deng, Fang, Li, Jianfen
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Analysis
Aqueous solutions
Biofuels
Biogas
Chemical properties
Diffusion
Diffusion models
Diffusion rate
Earth Sciences
Engineering
Engineering and Technology
Environmental engineering
Environmental science
Hazardous materials
Hazardous substances
Hydrogen-Ion Concentration
Kinetics
Models, Chemical
Nitrogen
Nitrogen (Chemical element)
Nitrogen - chemistry
Nitrogen - isolation & purification
Particle diffusion
pH effects
Phosphates
Phosphorus
Phosphorus - chemistry
Phosphorus - isolation & purification
Physical Sciences
Properties
Slurries
Sodium chloride
Sodium Chloride - chemistry
Sorption
Surface diffusion
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water treatment
Zeolite
Zeolites
Zeolites - chemistry
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Summary:A NaCl-modified zeolite was used to simultaneously remove nitrogen and phosphate from biogas slurry. The effect of pH, contact time and dosage of absorbants on the removal efficiency of nitrogen and phosphate were studied. The results showed that the highest removal efficiency of NH4+-N (92.13%) and PO43--P (90.3%) were achieved at pH 8. While the zeolite doses ranged from 0.5 to 5 g/100 ml, NH4+-N and PO43--P removal efficiencies ranged from 5.19% to 94.94% and 72.16% to 91.63% respectively. The adsorption isotherms of N and P removal with NaCl-modified zeolite were well described by Langmuir models, suggesting the homogeneous sorption mechanisms. While through intra-particle diffusion model to analyze the influence of contact time, it showed that the adsorption process of NH4+-N and PO43--P followed the second step of intra-particle diffusion model. The surface diffusion adsorption step was very fast which was finished in a short time.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0176109