Effects of feed solution chemistry on low pressure reverse osmosis filtration of cesium and strontium

Ding, Shiyuan; Yu, Yang; Huang, Haiou; Liu, Hengchen; Hou, Linlin

doi:10.1016/j.jhazmat.2015.03.056

Cited by 55 publications

(24 citation statements)

References 38 publications

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“…The separation mechanisms of Sr by NF/RO membranes mainly include size (steric), dielectric, and Donnan exclusion (electrostatic repulsion) [45][46][47]. The Sr 2+ ion is larger than the NF/RO membrane's MWCO, or pore size, so it can be separated by NF/RO membranes due to size exclusion [46].…”

Section: Relativementioning

confidence: 99%

Removal of Naturally Occurring Strontium by Nanofiltration/Reverse Osmosis from Groundwater

2020

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Removal of naturally occurring strontium (Sr) from groundwater is vital as excessive exposure may lead to bone growth problems in children. Nanofiltration/reverse osmosis (NF/RO) is commonly used in groundwater treatment due to the high effectiveness and simple maintenance of these pressure driven membrane processes. In this research, a pilot-scale NF/RO system was used to desalinate a natural groundwater sample containing high Sr concentration (10.3 mg/L) and “old” groundwater organic matter (70.9 mg/L) from Esilalei in northern Tanzania to understand the removal of strontium by NF/RO. The impact of applied pressure (10–15 bar) and groundwater pH (3–12) on the membrane performance including permeate flux, strontium and total organic carbon (TOC) flux and removal was investigated. Increasing applied pressure was found to enhance the flux by increasing the driving force and enhance Sr and TOC removal by dilution effect (water flux higher than Sr passage). The alkaline pH caused severe flux decline likely due to membrane fouling and scaling, while it slightly enhanced Sr removal of RO membranes, but weakened the TOC removal. In contrast, acidic and neutral pH of groundwater enhanced TOC removal. These findings suggest that appropriately high applied pressure and acidic pH condition of groundwater are recommended to apply to the NF/RO membrane system in groundwater desalination to achieve better membrane performance.

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Section: Relativementioning

confidence: 99%

Removal of Naturally Occurring Strontium by Nanofiltration/Reverse Osmosis from Groundwater

2020

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“…pH also affects nuclides rejection by changing membrane surface charge form and density. In Ding's study, Cs(I) rejection increased to a maximum at pH lower than 3 when membrane surface charge stayed positive, and decreased at pH about 5 when membrane surface charge started to turn negative . Therefore, the influent chemistry is still important.…”

Section: Introductionmentioning

confidence: 98%

The influence of salts on the reverse osmosis performance treating simulated boron‐containing low level radioactive wastewater

Ding

Zhao

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: With the rapid development of nuclear energy in China, a broad spectrum of low level radioactive wastewater (LLRW) has been generated and must be purified prior to discharging to the environment. Reverse osmosis (RO) has been proved an effective technology in the treatment of high boron-containing LLRW in nuclear power plants (NPPs). However, there is always a large amount of salts in the LLRW as background compounds. It is important to understand the influences of salts on the rejection of nuclides and boron.RESULTS: A lab-scale cross-flow membrane filtration unit was used. With the increase of ion concentration, the permeate flux decreased by 15% and 25% for BW30XFR and LE, respectively. Nuclides rejection increased by 2-8% and boron rejection increased by 5-10% when raising salts concentration to 2.5 mmol L -1 . Divalent ions such as Mg 2+ and SO 4 2− had a stronger impact than monovalent ions such as Na + and Cl − on nuclides and boron rejection. CONCLUSION: Increasing ion strength promoted the rejection of trace nuclides and boron, but at the cost of membrane flux loss.The results of dealing with simulated wastewater would give us information to better understand how to treat real radioactive wastewater.

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“…In addition, there are other radiologically inactive ions and organic compounds existing in excessive amounts. For example, boron concentration is about 500 mg/L, which is released from primary coolant during the outage period in pressurized or boiling water reactors . These background compositions may affect the rejection of trace nuclides.…”

Section: Introductionmentioning

confidence: 99%

“…For example, boron concentration is about 500 mg/L, which is released from primary coolant during the outage period in pressurized or boiling water reactors. 2 These background compositions may affect the rejection of trace nuclides. Although treatment has its difficulties, boron-containing LRW treatment is essential because of its widely stated hazardness.…”

Section: Introductionmentioning

confidence: 99%

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

Chen

Ding

Zhao

2019

J of Chemical Tech & Biotech

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BACKGROUND Reverse osmosis (RO), which is widely utilized in wastewater treatment, has been proven to be an effective tool for ion separation with high salts rejection. However, owing to the extremely low concentration of nuclides in boron‐containing low‐level radioactive wastewaters (LRWs), there is a significant reduction in rejection of nuclides by using commercial RO membranes. In this study, in order to obtain higher nuclides rejection under trace‐level condition, novel polyamide RO membranes were fabricated by grafting polyethylenimine (PEI) with different molecular weights on commercial RO membrane surfaces. RESULTS The properties of PEI‐modified membranes were analyzed, such as surface charge, morphology and hydrophilicity. The results showed that zeta potential at pH 7 increased from −22.89 mV to 20.19 mV, which indicated that surface charge altered from negative to positive. Meanwhile, hydrophilicity of membranes was improved since the contact angle decreased from 65° to 36°. The decontamination factor (DF) of cesium(I) increased from 11.69 to 114.23 and the DF of cobalt(II) increased from 28.62 to 3306.88. CONCLUSION The laboratory‐scale experiments with cross‐flow demonstrated the effective rejection of nuclides without obvious membrane flux loss of PEI‐modified membranes. In addition, PEI‐modified membranes offered a stable nuclides removal under high‐level background boron and various pH conditions, which demonstrated a possible application in boron‐containing LRW treatment. © 2019 Society of Chemical Industry

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Effects of feed solution chemistry on low pressure reverse osmosis filtration of cesium and strontium

Cited by 55 publications

References 38 publications

Removal of Naturally Occurring Strontium by Nanofiltration/Reverse Osmosis from Groundwater

Removal of Naturally Occurring Strontium by Nanofiltration/Reverse Osmosis from Groundwater

The influence of salts on the reverse osmosis performance treating simulated boron‐containing low level radioactive wastewater

The application of polyethylenimine grafting reverse osmosis membrane in treating boron‐containing low‐level radioactive wastewaters

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