投加粉末活性炭對超濾膜去除海水中有機物的影響
發(fā)布時間:2018-11-22 08:50
【摘要】:超濾膜的有機污染問題是膜法海水預處理技術在海水淡化工程應用面臨的重要挑戰(zhàn),粉末活性炭吸附是目前常用的膜前預處理手段之一。本文對比分析了直接超濾和投加粉末活性炭后對海水中有機物的截留能力,利用三維熒光光譜分析了投加粉末活性炭對超濾膜截留有機物的影響機制,并考察了海水超濾過程中通量變化及膜污染情況。研究結果表明,投加粉末活性炭能夠強化超濾膜對海水濁度和有機物的去除,當粉末活性炭投量為200mg/L時,整個系統(tǒng)對海水中DOC去除率從直接超濾時的55.1%提高到77.6%。利用粉末活性炭的吸附作用及其在超濾膜表面形成的疏松濾餅層能夠顯著提高超濾系統(tǒng)對海水中腐植酸類有機物的去除能力。與直接超濾相比,粉末活性炭-超濾系統(tǒng)對改善膜通量的作用有限,但粉末活性炭形成的濾餅層能夠避免超濾膜與有機物直接接觸,可顯著減緩超濾膜的不可逆污染。
[Abstract]:The organic pollution of ultrafiltration membrane is an important challenge for the application of membrane seawater pretreatment technology in seawater desalination engineering. The adsorption of powdered activated carbon is one of the commonly used pre-membrane pretreatment methods. In this paper, the retention ability of organic matter in seawater after direct ultrafiltration and adding powdered activated carbon is compared and analyzed. The influence mechanism of adding powdered activated carbon on the retention of organic matter in ultrafiltration membrane is analyzed by using three dimensional fluorescence spectroscopy. The flux change and membrane fouling during ultrafiltration were investigated. The results show that adding powdered activated carbon can enhance the removal of turbidity and organic matter in seawater by ultrafiltration membrane. When the dosage of powdered activated carbon is 200mg/L, The removal rate of DOC in seawater increased from 55.1% in direct ultrafiltration to 77.6% in the whole system. The adsorption of powdered activated carbon and the loose cake layer formed on the surface of ultrafiltration membrane can significantly improve the removal capacity of humic acid organic compounds in seawater by ultrafiltration system. Compared with direct ultrafiltration, the effect of powder activated carbon-ultrafiltration system on improving membrane flux is limited, but the cake layer formed by powder activated carbon can avoid direct contact between ultrafiltration membrane and organic matter, and can significantly reduce the irreversible fouling of ultrafiltration membrane.
【作者單位】: 國家海洋局天津海水淡化與綜合利用研究所;
【基金】:中央級公益性科研院所基本科研業(yè)務費專項資金項目(K-JBYWF-2015-T10) 海洋公益性行業(yè)科研專項項目(201405035)
【分類號】:P747
,
本文編號:2348753
[Abstract]:The organic pollution of ultrafiltration membrane is an important challenge for the application of membrane seawater pretreatment technology in seawater desalination engineering. The adsorption of powdered activated carbon is one of the commonly used pre-membrane pretreatment methods. In this paper, the retention ability of organic matter in seawater after direct ultrafiltration and adding powdered activated carbon is compared and analyzed. The influence mechanism of adding powdered activated carbon on the retention of organic matter in ultrafiltration membrane is analyzed by using three dimensional fluorescence spectroscopy. The flux change and membrane fouling during ultrafiltration were investigated. The results show that adding powdered activated carbon can enhance the removal of turbidity and organic matter in seawater by ultrafiltration membrane. When the dosage of powdered activated carbon is 200mg/L, The removal rate of DOC in seawater increased from 55.1% in direct ultrafiltration to 77.6% in the whole system. The adsorption of powdered activated carbon and the loose cake layer formed on the surface of ultrafiltration membrane can significantly improve the removal capacity of humic acid organic compounds in seawater by ultrafiltration system. Compared with direct ultrafiltration, the effect of powder activated carbon-ultrafiltration system on improving membrane flux is limited, but the cake layer formed by powder activated carbon can avoid direct contact between ultrafiltration membrane and organic matter, and can significantly reduce the irreversible fouling of ultrafiltration membrane.
【作者單位】: 國家海洋局天津海水淡化與綜合利用研究所;
【基金】:中央級公益性科研院所基本科研業(yè)務費專項資金項目(K-JBYWF-2015-T10) 海洋公益性行業(yè)科研專項項目(201405035)
【分類號】:P747
,
本文編號:2348753
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