AI Article Synopsis
- Reverse osmosis concentrate (ROC) contains high levels of organic compounds that may harm the environment, and existing treatment methods often produce toxic by-products.
- A study investigated the effectiveness of ion-exchange resin (Purolite A502PS) in a micro-filtration-IEX hybrid system to reduce organics in ROC, achieving a 45-60% reduction in dissolved organic carbon.
- The resin's presence reduced membrane fouling by pre-adsorbing organics and scouring the membrane, with a focus on removing negatively charged and hydrophobic compounds, suggesting further research on resin replacement and energy efficiency.
Article Abstract
Reverse osmosis concentrate (ROC) produced as the by-product of the reverse osmosis process consists of a high load of organics (macro and micro) that potentially cause eco-toxicological effects in the environment. Previous studies focused on the removal of such compounds using oxidation, adsorption, and membrane-based treatments. However, these methods were not always efficient and formed toxic by-products. The impact of ion-exchange resin (IEX) (PuroliteA502PS) was studied in a micro-filtration-IEX hybrid system to remove organics from ROC for varying doses of Purolite A502PS (5-20 g/L) at a flux of 36 L/mh. The purolite particles in the membrane reactor reduced membrane fouling, evidenced by the reduction of transmembrane pressure (TMP), by pre-adsorbing the organics, and by mechanically scouring the membrane. The dissolved organic carbon was reduced by 45-60%, out of which 48-81% of the hydrophilics were removed followed by the hydrophobics and low molecular weight compounds (LMWs). This was based on fluorescence excitation-emission matrix and liquid chromatography-organic carbon detection. Negatively charged and hydrophobic organic compounds were preferentially removed by resin. Long-term experiments with different daily replacements of resin are suggested to minimize the resin requirements and energy consumption.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9967736 | PMC |
| http://dx.doi.org/10.3390/membranes13020136 | DOI Listing |
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