当前位置：
X-MOL 学术
›
Environ. Sci.: Water Res. Technol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Emerging investigator series: control of membrane fouling by dissolved algal organic matter using pre-oxidation with coagulation as seawater pretreatment
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-01-27 , DOI: 10.1039/c9ew00955h Bhaskar Jyoti Deka 1, 2, 3, 4 , Jiaxin Guo 1, 2, 3, 4 , Sanghyun Jeong 5, 6, 7, 8 , Manish Kumar 9, 10, 11 , Alicia Kyoungjin An 1, 2, 3, 4
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-01-27 , DOI: 10.1039/c9ew00955h Bhaskar Jyoti Deka 1, 2, 3, 4 , Jiaxin Guo 1, 2, 3, 4 , Sanghyun Jeong 5, 6, 7, 8 , Manish Kumar 9, 10, 11 , Alicia Kyoungjin An 1, 2, 3, 4
Affiliation
|
Marine algae produce organic matter, namely algal organic matter (AOM), especially during a harmful algal bloom. AOM has been recognised as a key cause for the formation of organic fouling on membranes in seawater desalination applications. In this study, pre-oxidation of AOM by potassium permanganate (KMnO4) and sodium hypochlorite (NaOCl) was investigated. In addition, ferric (Fe3+) and alum (Al3+) coagulants were used for subsequent coagulation. Two different operational modes, conventional coagulation–flocculation–sedimentation (CFS) and coagulation–flocculation-dissolved air flotation (CF-DAF) processes, were used to evaluate pretreatment performance using synthetic AOM with an initial dissolved organic carbon (DOC) of around 4.8 mg C L−1 (turbidity ≈ 4.47 NTU, pH ≈ 8). Pre-oxidation with coagulation removed more AOM, compared to oxidation or coagulation alone. The removal of DOC by NaOCl–Fe3+ is relatively high when compared to other combinations of oxidant and coagulant because of in situ ferrate (Fe6+) generation, which was detected by the ABTS (2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid))-ultraviolet visible (UV-vis) method. Pre-oxidation with 1.5 mg L−1 NaOCl followed by coagulation with 2.5–3.0 mg L−1 Fe3+ achieved a maximum DOC removal of 65–76% during the CFS treatment; while, the DOC removal could further increase up to 83–85% by introducing CF-DAF. Particularly, the NaOCl–Fe3+ treatment generated 1.31 mg L−1 of in situ ferrate (Fe6+). Finally, pre-oxidation and coagulation coupled with DAF successfully reduced fouling and lowered flux decline in a microfiltration (MF) membrane. Non-invasive optical coherence tomography (OCT) was performed to monitor the fouling development on the MF membrane before and after pretreatment.
中文翻译：
新兴研究者系列：使用混凝作为海水预处理的预氧化，通过溶解的藻类有机物控制膜污染
海藻会产生有机物，即藻类有机物（AOM），特别是在有害藻华期间。在海水淡化应用中，AOM被公认为是膜上形成有机污垢的关键原因。在这项研究中，研究了高锰酸钾（KMnO 4）和次氯酸钠（NaOCl）对AOM的预氧化作用。另外，使用铁（Fe 3+）和明矾（Al 3+）凝结剂进行后续凝结。两种不同的操作模式，即常规混凝-絮凝-沉淀（CFS）和混凝-絮凝-溶解气浮（CF-DAF）工艺，用于评估合成AOM的预处理性能，初始溶解有机碳（DOC）约为4.8毫克CL -1（浊度≈4.47 NTU，pH≈8）。与单独的氧化或凝结相比，凝结的预氧化去除了更多的AOM。通过次氯酸钠-铁的去除DOC的3+是相对高时相比，氧化剂和凝结剂的因的其他组合在原位高铁酸盐（铁6+）的产生，这是由ABTS（2,2'-连氮基-双（检测3-乙基苯并噻唑啉-6-磺酸））-紫外可见（UV-vis）方法。在CFS处理过程中，用1.5 mg L -1 NaOCl进行预氧化，然后用2.5–3.0 mg L -1 Fe 3+进行凝结，可将最大DOC去除率达到65–76％。而引入CF-DAF可以将DOC的去除率进一步提高至83-85％。特别是NaOCl–Fe 3+处理产生1.31 mg L -1的原位高铁酸盐（Fe 6+）。最后，预氧化和凝结结合DAF成功地减少了微滤膜（MF）膜的结垢并降低了通量下降。进行非侵入式光学相干断层扫描（OCT），以监测预处理前后MF膜上的结垢情况。
更新日期：2020-01-27
中文翻译：
新兴研究者系列：使用混凝作为海水预处理的预氧化，通过溶解的藻类有机物控制膜污染
海藻会产生有机物，即藻类有机物（AOM），特别是在有害藻华期间。在海水淡化应用中，AOM被公认为是膜上形成有机污垢的关键原因。在这项研究中，研究了高锰酸钾（KMnO 4）和次氯酸钠（NaOCl）对AOM的预氧化作用。另外，使用铁（Fe 3+）和明矾（Al 3+）凝结剂进行后续凝结。两种不同的操作模式，即常规混凝-絮凝-沉淀（CFS）和混凝-絮凝-溶解气浮（CF-DAF）工艺，用于评估合成AOM的预处理性能，初始溶解有机碳（DOC）约为4.8毫克CL -1（浊度≈4.47 NTU，pH≈8）。与单独的氧化或凝结相比，凝结的预氧化去除了更多的AOM。通过次氯酸钠-铁的去除DOC的3+是相对高时相比，氧化剂和凝结剂的因的其他组合在原位高铁酸盐（铁6+）的产生，这是由ABTS（2,2'-连氮基-双（检测3-乙基苯并噻唑啉-6-磺酸））-紫外可见（UV-vis）方法。在CFS处理过程中，用1.5 mg L -1 NaOCl进行预氧化，然后用2.5–3.0 mg L -1 Fe 3+进行凝结，可将最大DOC去除率达到65–76％。而引入CF-DAF可以将DOC的去除率进一步提高至83-85％。特别是NaOCl–Fe 3+处理产生1.31 mg L -1的原位高铁酸盐（Fe 6+）。最后，预氧化和凝结结合DAF成功地减少了微滤膜（MF）膜的结垢并降低了通量下降。进行非侵入式光学相干断层扫描（OCT），以监测预处理前后MF膜上的结垢情况。
京公网安备 11010802027423号