Comprehensive Bench- and Pilot-Scale Investigation of Trace Organic Compounds Rejection by Forward Osmosis

2011 ◽  
Vol 45 (19) ◽  
pp. 8483-8490 ◽  
Author(s):  
Nathan T. Hancock ◽  
Pei Xu ◽  
Dean M. Heil ◽  
Christopher Bellona ◽  
Tzahi Y. Cath
Keyword(s):  
Organic Compounds ◽  
Forward Osmosis ◽  
Pilot Scale ◽  
Trace Organic Compounds ◽  
Trace Organic

scholarly journals Oxidation of Selected Trace Organic Compounds through the Combination of Inline Electro-Chlorination with UV Radiation (UV/ECl2) as Alternative AOP for Decentralized Drinking Water Treatment

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3275
Author(s):  
Philipp Otter ◽  
Katharina Mette ◽  
Robert Wesch ◽  
Tobias Gerhardt ◽  
Frank-Marc Krüger ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Organic Compounds ◽  
Energy Input ◽  
Drinking Water Treatment ◽  
Pilot Scale ◽  
Residual Chlorine ◽  
Trace Organic Compounds ◽  
Drinking Water Standard ◽  
Trace Organic

A large variety of Advanced Oxidation Processes (AOPs) to degrade trace organic compounds during water treatment have been studied on a lab scale in the past. This paper presents the combination of inline electrolytic chlorine generation (ECl2) with low pressure UV reactors (UV/ECl2) in order to allow the operation of a chlorine-based AOP without the need for any chlorine dosing. Lab studies showed that from a Free Available Chlorine (FAC) concentration range between 1 and 18 mg/L produced by ECl2 up to 84% can be photolyzed to form, among others, hydroxyl radicals (OH) with an UV energy input of 0.48 kWh/m3. This ratio could be increased to 97% by doubling the UV energy input to 0.96 kWh/m3 and was constant throughout the tested FAC range. Also the achieved radical yield of 64% did not change along the given FAC concentration range and no dependence between pH 6 and pH 8 could be found, largely simplifying the operation of a pilot scale system in drinking water treatment. Whereas with ECl2 alone only 5% of benzotriazoles could be degraded, the combination with UV improved the degradation to 89%. Similar results were achieved for 4-methylbenzotriazole, 5-methylbenzotriazole and iomeprol. Oxipurinol and gabapentin were readily degraded by ECl2 alone. The trihalomethanes values were maintained below the Germany drinking water standard of 50 µg/L, provided residual chlorine concentrations are kept within the permissible limits. The here presented treatment approach is promising for decentralized treatment application but requires further optimization in order to reduce its energy requirements.

Thin-film composite forward osmosis membrane in rejecting trace organic compounds: Impact of molecular charge

2017 ◽  
Vol 66 ◽  
pp. 23-35 ◽  
Author(s):  
Yan-Ling Liu ◽  
Fan-Xin Kong ◽  
Xiao-Mao Wang ◽  
Hong-Wei Yang ◽  
Yuefeng F. Xie
Keyword(s):  
Thin Film ◽  
Organic Compounds ◽  
Forward Osmosis ◽  
Trace Organic Compounds ◽  
Film Composite ◽  
Thin Film Composite ◽  
Molecular Charge ◽  
Trace Organic

scholarly journals The Change of Forward Osmosis Filtration Performance by Trace Organic Compounds in Heavy Metal Removal by Forward Osmosis Filtration

2021 ◽  
Vol 43 (3) ◽  
pp. 187-195
Author(s):  
Kyungkeun Jo
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Compounds ◽  
Metal Removal ◽  
Water Flux ◽  
Forward Osmosis ◽  
Rejection Rate ◽  
Salt Flux ◽  
Trace Organic Compounds ◽  
Trace Organic

Objectives : The purpose of this study was to examine how the presence of trace organic compounds (TROCs) affects water flux and heavy metal rejection in forward osmosis (FO) filtration when feed solution (FS) contains TROCs and heavy metals.Methods : Four FS (① only heavy metals, ② heavy metals and Trimethoprim, ③ heavy metals and Ibuprofen, ④ heavy metals and Triclosan) were used, and the FO filtration experiments were conducted to perform comparative analysis on the water flux and the rejection rate depending on the FS type.Results and Discussion : The water flux was higher when FS contained TROCs except Ibuprofen, compared to FS containing only heavy metals. It is speculated that the increased water flux was influenced by the decrease in the internal concentration polarization (ICP), which was caused by the adsorption of the TROCs in the support layer of the membrane. The water flux decreased when FS contained Ibuprofen, and this may be because reverse salt flux increased due to the Gibbs-Donnan effect. The rejection rate was not affected by TROCs when heavy metals were mostly rejected in FO filtration, but for the heavy metal that was not fully rejected, the rejection rate increased when FS contained TROCs. It is speculated that this was mainly due to clogging caused by the adsorption on the membrane.Conclusions : It was demonstrated that the presence of TROCs in FS can affect water flux and the rejection rate of heavy metals. Therefore, when the FS containing heavy metals and various organic substances is treated by FO filtration, the performance of the filtration is expected to change depending on the composition of the solution.

Rejection of Trace Organic Compounds by Forward Osmosis Membranes: A Literature Review

2014 ◽  
Vol 48 (7) ◽  
pp. 3612-3624 ◽  
Author(s):  
Bryan D. Coday ◽  
Bethany G. M. Yaffe ◽  
Pei Xu ◽  
Tzahi Y. Cath
Keyword(s):  
Literature Review ◽  
Organic Compounds ◽  
Forward Osmosis ◽  
Trace Organic Compounds ◽  
Trace Organic

Transport of trace organic compounds through novel forward osmosis membranes: Role of membrane properties and the draw solution

2018 ◽  
Vol 141 ◽  
pp. 65-73 ◽  
Author(s):  
Marc Sauchelli ◽  
Giuseppe Pellegrino ◽  
Arnout D'Haese ◽  
Ignasi Rodríguez-Roda ◽  
Wolfgang Gernjak
Keyword(s):  
Organic Compounds ◽  
Forward Osmosis ◽  
Membrane Properties ◽  
Trace Organic Compounds ◽  
Draw Solution ◽  
Trace Organic
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