进水温度对膜蒸馏处理焦化废水效能的影响
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摘要
采用直接接触式膜蒸馏处理焦化废水,通过监测出水电导率、 DOC、色度、 UV254并利用三维荧光光谱对出水水质进行分析,探究了焦化废水的进水温度对膜蒸馏处理效果的影响。结果表明,随着温度升高膜通量明显升高,当进水温度为40、 50和60℃时,初始膜通量分别为8.7、 14.6和21.7 kg/(m2·h)。随着温度的升高,焦化废水中污染物的扩散程度也随之加剧, 60℃时出水中有机物浓度比40、 50℃提高了约40%。膜蒸馏能有效截留焦化废水中的类腐殖酸和类富里酸等大分子污染物,而芳香烃及杂环类有机物是影响膜蒸馏产水水质的主要因素,随着温度升高,苯酚等易挥发的小分子有机物扩散也明显加快。此外,不同进水温度下膜污染形成的规律不同, 40℃时以无机污染为主, 50℃时以有机污染为主, 60℃时以有机和无机复合污染为主,这可能与温度升高后有机物扩散速率加快有关。综合比较,采用膜蒸馏处理焦化废水时进水温度拟选择50℃为宜。
Using direct contact distillation to treat coking wastewater, the conductivity, DOC, chroma and UV254 of the effluent water were monitored, the effluent water quality was analyzed by three-dimensional fluorescence spectrum, and then, the influence of feedwater temperature on coking wastewater treatment by membrane distillation was investigated. The results showed that, with the increasing feedwater temperature, the membrane flux increased obviously, when the feedwater temperature were 40, 50 and 60 ℃ respectively, the initial membrane flux were 8.7, 14.6, 21.7 kg/(m2·h) respectively. The pollutants diffusion was aggravated with the increase of the feedwater temperature, compared to the feedwater at 40 and 50 ℃, the organic matters concentration in the effluent water at 60 ℃ was increased by about 40%. Membrane distillation could effectively intercept macromolecular pollutants such as humic acid-like organics and fulvic acid-like organics in coking wastewater. Aromatic hydrocarbons and heterocyclic organics were the main components affecting produced water quality, and the diffusion speed of phenol and some other volatile low molecular weight organic matters were obviously accelerated with the increasing temperature. In addition, there was different membrane fouling propensity under different feedwater temperatures, inorganic pollutants were predominant at 40 ℃, organic pollutants were dominant at 50 ℃, while the major pollutants over 60 ℃ were organic/inorganic composite. The above phenomenon might be related to the accelerated diffusion of organic matters under high temperature. Therefore, through a comprehensive comparison, 50℃ should be a proper feedwater temperature for membrane distillation treating coking wastewater.
Using direct contact distillation to treat coking wastewater, the conductivity, DOC, chroma and UV254 of the effluent water were monitored, the effluent water quality was analyzed by three-dimensional fluorescence spectrum, and then, the influence of feedwater temperature on coking wastewater treatment by membrane distillation was investigated. The results showed that, with the increasing feedwater temperature, the membrane flux increased obviously, when the feedwater temperature were 40, 50 and 60 ℃ respectively, the initial membrane flux were 8.7, 14.6, 21.7 kg/(m2·h) respectively. The pollutants diffusion was aggravated with the increase of the feedwater temperature, compared to the feedwater at 40 and 50 ℃, the organic matters concentration in the effluent water at 60 ℃ was increased by about 40%. Membrane distillation could effectively intercept macromolecular pollutants such as humic acid-like organics and fulvic acid-like organics in coking wastewater. Aromatic hydrocarbons and heterocyclic organics were the main components affecting produced water quality, and the diffusion speed of phenol and some other volatile low molecular weight organic matters were obviously accelerated with the increasing temperature. In addition, there was different membrane fouling propensity under different feedwater temperatures, inorganic pollutants were predominant at 40 ℃, organic pollutants were dominant at 50 ℃, while the major pollutants over 60 ℃ were organic/inorganic composite. The above phenomenon might be related to the accelerated diffusion of organic matters under high temperature. Therefore, through a comprehensive comparison, 50℃ should be a proper feedwater temperature for membrane distillation treating coking wastewater.
引文
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[12] OU H S, WEI C H, MO C H, et al. Novel insights into anoxic/aerobic 1/aerobic 2, biological fluidized-bed system for cokewastewater treatment by fluorescence excitation-emission matrixspectra coupled with parallel factor analysis[J]. Chemosphere,2014, 113:158-164.
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[14]张凤君,林学钰,刘虹,等.苯酚的膜蒸馏及结晶回收处理研究[J].水处理技术, 2002, 28(3):137-139.
[15] MING X, PRICE W E, LONG D N, et al. Effects of feed anddraw solution temperature and transmembrane temperaturedifference on the rejection of trace organic contaminants by forwardosmosis[J]. Journal of Membrane Science, 2013, 438(7):57-64.
[16]张万辉,朝海,吴超飞,等.焦化废水中有机物的识别、污染特性及其在废水处理过程中的降解[J].环境化学, 2012,31(10):1480-1486.
[17]阳立平,肖贤明.焦化废水脱色研究进展[J].工业用水与废水, 2008, 39(5):6-10.
[18]贺润升,徐荣华,韦朝海.焦化废水生物出水溶解性有机物特性光谱表征[J].环境化学, 2015,(1):129-136.
[2]武警,张翠钰,李剑锋,等.膜蒸馏处理焦化废水生化出水的试验研究[J].工业用水与废水, 2015, 46(6):13-17.
[3] XU L, WANG J, ZHANG X, et al. Development of a novelintegrated membrane system incorporated with an activated cokeadsorption unit for advanced coal gasification wastewater treatment[J]. Colloids&Surfaces A Physicochemical&Engineering Aspects,2015, 484:99-107.
[4]王毅霖,张晓飞,杨雪莹.膜蒸馏技术在炼化污水处理中的应用[J].油气田环境保护, 2016, 26(3):48-50.
[5] AN A K, GUO J, LEE E J, et al. PDMS/PVDF hybrid electro-spun membrane with superhydrophobic property and drop impactdynamics for dyeing wastewater treatment using membrane distilla-tion[J]. Journal of Membrane Science, 2016, 525:57-67.
[6]李玉平,王丽英,张家利,等.焦化废水强化处理关键技术研究与探讨[J].给水排水, 2013, 39(8):59-63.
[7] REN J, LI J, CHEN Z, et al. Fate and wetting potential of bio-refractory organics in membrane distillation for coke wastewatertreatment[J]. Chemosphere, 2018, 208:450-459.
[8] LI J, WU J, SUN H, et al. Advanced treatment of biologicallytreated coking wastewater by membrane distillation coupled withpre-coagulation[J]. Desalination, 2016, 380:43-51.
[9] GUILLEN-BURRIEZA E, MAVUKKANDY M O, BILAD M R,et al. Understanding wetting phenomena in membrane distillationand how operational parameters can affect it[J]. Journal ofMembrane Science, 2016, 515:163-174.
[10]李建国,李剑锋,任静,等.超疏水疏油改性PVDF膜用于膜蒸馏深度处理焦化废水[J].水处理技术, 2018, 44(3):58-62.
[11]代婷,武春瑞,吕晓龙,等.典型污染物对膜蒸馏过程膜污染的影响[J].水处理技术, 2012, 38(8):9-14.
[12] OU H S, WEI C H, MO C H, et al. Novel insights into anoxic/aerobic 1/aerobic 2, biological fluidized-bed system for cokewastewater treatment by fluorescence excitation-emission matrixspectra coupled with parallel factor analysis[J]. Chemosphere,2014, 113:158-164.
[13] HUANG Y X, WANG Z, JIN J, et al. A Novel Janus Membranefor Membrane Distillation with Simultaneous Fouling and WettingResistance[J]. Environmental Science&Technology, 2017, 51(22):13304-13310.
[14]张凤君,林学钰,刘虹,等.苯酚的膜蒸馏及结晶回收处理研究[J].水处理技术, 2002, 28(3):137-139.
[15] MING X, PRICE W E, LONG D N, et al. Effects of feed anddraw solution temperature and transmembrane temperaturedifference on the rejection of trace organic contaminants by forwardosmosis[J]. Journal of Membrane Science, 2013, 438(7):57-64.
[16]张万辉,朝海,吴超飞,等.焦化废水中有机物的识别、污染特性及其在废水处理过程中的降解[J].环境化学, 2012,31(10):1480-1486.
[17]阳立平,肖贤明.焦化废水脱色研究进展[J].工业用水与废水, 2008, 39(5):6-10.
[18]贺润升,徐荣华,韦朝海.焦化废水生物出水溶解性有机物特性光谱表征[J].环境化学, 2015,(1):129-136.