Desalination of reclaimed water by nanofiltration in an artificial groundwater recharge system

Desalination is important in artificial groundwater recharge with reclaimed water for minimizing the effect of salinity on groundwater and soil quality. In this study four kinds of nanofiltration membrane, as the compensatory process in soil treatment, are embedded into enhanced direct injection-wel...

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Bibliographic Details
Published in:Aqua (London) 2009-11, Vol.58 (7), p.463-469
Main Authors: Lin Lin, Wu, Xuan, Zhao, Meng, Zhang, Xu Zhou, Cheng
Format: Article
Language:English
Subjects:
Alkalinity
Anions
Applied sciences
Buildings. Public works
Chlorides
Desalination
Exact sciences and technology
Groundwater
Groundwater recharge
Heavy metals
Inorganic compounds
Membranes
Metal concentrations
Metals
Nanofiltration
Nanotechnology
Reclaimed water
Reclamation
Removal
Risk reduction
SAR (radar)
Sodium
Soil
Soil quality
Soil structure
Soil treatment
Total dissolved solids
Water desalting
Water supply. Pipings. Water treatment
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Summary:Desalination is important in artificial groundwater recharge with reclaimed water for minimizing the effect of salinity on groundwater and soil quality. In this study four kinds of nanofiltration membrane, as the compensatory process in soil treatment, are embedded into enhanced direct injection-well recharge (EnDir) for desalination purposes. The lab-scale experiments indicate that nanofiltration (NF) in the sequence of short-term soil treatment provides additional removal of organic and inorganic compounds. NF90 exhibits a marked superiority over the other types of membrane, with respect to the desalinization of reclaimed water. The removal efficiencies for total dissolved solids (TDS) and alkalinity amount to 89% and 96%, respectively. For the anions in the reclaimed water, NF90 exhibits 80% removal efficiency for nitrate, 94% for chloride and 99% for sulphate, which are removed to a limited extent in the soil treatment. The sodium adsorption ratio (SAR) value of NF90 permeate is the lowest among these membranes, which minimizes the risk of sodification associated with soil structure degradation during artificial groundwater recharge. In addition, NF90 can reduce the concentrations of heavy metals in the reclaimed water to far below the national standards for groundwater.
ISSN:1606-9935
0003-7214
1605-3974
DOI:10.2166/aqua.2009.016