正渗透在煤化工废水零排放处理工艺中的应用研究
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摘要
对正渗透在煤化工废水零排放工艺中的布置位置、汲取液优选、膜污染等方面进行了研究。结果表明,在没有废热可利用的前提下,与NH4HCO3和Mg Cl2相比,Na Cl溶液作为汲取液具有明显的优势。利用正渗透浓缩生化进水时,高浓度酚的存在会损坏正渗透膜,因此,正渗透不宜设置在生化处理前端。利用正渗透浓缩生化出水时,2.5 mol/L Na Cl溶液作为汲取液,系统运行平稳,最大水回收率高达91.1%;膜污染主要以有机污染为主,而无机污染则以铁盐污染为主。
The exploratory research on the position setting of forward osmosis(FO) in the zero discharge of coal chemical industrial wastewater,the selective preference of draw solution,membrane fouling,etc. has been conducted. The results show that from the premise that no waste heat can be utilized,Na Cl solution,as a kind of draw solution,has remarkable superiority,compared with NH4 HCO3 and Mg Cl2. When the FO is used for the concentration of biochemical influent,the presence of highly concentrated phenol can damage the osmosis membrane. Therefore,it is not suitable for the FO to be set at the front terminal of biological treatment. When the FO is used for the concentration of biochemical effluent,2.5 mol/L of Na Cl solution as draw solution is used. The system runs steadily and the water recovery rate is as high as 91.1%. The membrane fouling is mainly caused by organic matter,while the inorganic pollution is mainly ferric salts.
The exploratory research on the position setting of forward osmosis(FO) in the zero discharge of coal chemical industrial wastewater,the selective preference of draw solution,membrane fouling,etc. has been conducted. The results show that from the premise that no waste heat can be utilized,Na Cl solution,as a kind of draw solution,has remarkable superiority,compared with NH4 HCO3 and Mg Cl2. When the FO is used for the concentration of biochemical influent,the presence of highly concentrated phenol can damage the osmosis membrane. Therefore,it is not suitable for the FO to be set at the front terminal of biological treatment. When the FO is used for the concentration of biochemical effluent,2.5 mol/L of Na Cl solution as draw solution is used. The system runs steadily and the water recovery rate is as high as 91.1%. The membrane fouling is mainly caused by organic matter,while the inorganic pollution is mainly ferric salts.
引文
[1]张鸿宇,周丽,张希良.我国现代煤化工产业现状及政策综述[J].现代化工,2018,38(5):1-5.
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[2]韩洪军,徐鹏,贾胜勇,等.煤气废水有机污染物缺氧生物降解性能及机理[J].哈尔滨工业大学学报,2015,47(8):30-37.
[3]何绪文,王春荣.新型煤化工废水零排放技术问题与解决思路[J].煤炭科学技术,2015,43(1):120-124.
[4]方芳,吴刚,韩洪军,等.我国煤化工废水处理关键工艺解析[J].水处理技术,2017,43(6):37-52.
[5] Chung T S,Zhang S,Wang K Y,et al. Forward osmosis processes:Yesterday,today and tomorrow[J]. Desalination,2012,287(2):78-81.
[6]王波,文湘华,申博,等.正渗透技术研究现状及进展[J].环境科学学报,2016,36(9):3118-3126.
[7] Her N,Amy G,Yoon Y,et al. Identification of nanofiltration membrane foulants[J]. Water Research,2007,41(17):3936-3947.
[8] Ren J,Mc Cutcheon J R. A new commercial thin film composite membrane for forward osmosis[J]. Desalination,2014,343(6):187-193.
[9]方征平,宋义虎,沈烈.高分子物理[M].杭州:浙江大学出版社,2004:31-42.