Performance and autopsy of nanofiltration membranes at an oil-field wastewater desalination plant
| Autor: | Dongsheng Zhao, Zhengyang Gu, Chang Su, Youbing Zhu, Guicai Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Health
Toxicology and Mutagenesis Polyacrylamide Acrylic Resins 010501 environmental sciences Sodium Chloride Wastewater 01 natural sciences Desalination Water Purification chemistry.chemical_compound Environmental Chemistry Organic matter 0105 earth and related environmental sciences chemistry.chemical_classification Fouling Chemistry Membrane fouling Membranes Artificial General Medicine Pulp and paper industry Silicon Dioxide Pollution Nanostructures Membrane Petroleum Nanofiltration Filtration |
| Zdroj: | Environmental science and pollution research international. 26(3) |
| ISSN: | 1614-7499 |
| Popis: | In this study, the long-term operational performance of an on-site NF facility at a full-scale oil-field wastewater desalination plant was monitored. The NF facility with poor permeability due to membrane fouling enables efficient multivalent salt removal (rejections of Mg2+, Ca2+, Fe3+, and Al3+ were approximately 100%). Moreover, a comparison of the cleaning efficiencies of two on-site cleaning modes indicated that PL-007 cleaning helped to improve the effectiveness of subsequent acid cleaning in the removal of inorganic foulants. Furthermore, a spiral-wound NF membrane module harvested from the plant was unfolded and autopsied. The results showed that both anionic polyacrylamide (APAM) and crude oil were identified as the predominant organic matter on the membrane surface and collectively accounted for a substantial fraction (86.3%) in terms of dry weight. Additionally, dissolved organics with a high molecular weight were prone to accumulation on the membrane surface. Multivalent elements, including Mg, Ca, Al, Fe, and Si, were the primary inorganic species in the fouling layer. Among the inorganic elements, Si occupied a high proportion and existed in the form of SiO2 in the fouling layer. According to the autopsy results, organic fouling combined with inorganics was responsible for the decline in the flux. |
| Databáze: | OpenAIRE |
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