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混凝-纳滤组合工艺处理印染整理废水的研究
刘威
Thesis Advisor高守亭
2018-07
Degree Grantor中国科学院研究生院
Degree Name硕士
Degree Discipline化学工程
Keyword印染废水,混凝,纳滤,膜污染
Abstract

纺织印染行业作为我国重要的工业部门,对我国经济产生重要的影响。印染废水由于工艺复杂,不同的染整要求导致不同工艺中加入的药剂不同,致使排放到废水中的污染物存在巨大差异,因此有针对性的对不同工艺中排放到废水中的污染物进行分段区别处理将大大降低处理难度。本实验选取整理废水作为研究对象,根据整理废水中的污染物:纤维屑、柔软剂、油剂、树脂、浆料等,提出采用混凝-纳滤组合工艺进行试验处理,并对工艺中的各种影响因素进行了研究,主要结论如下:(1)以聚丙烯酰胺为助凝剂,分别比较了聚合氯化铝、聚合氯化铁、硫酸铝、氯化铁四种絮凝剂对整理废水中的COD和浊度的去除效果,结果表明聚合氯化铝处理效果最佳。进一步通过正交实验确定了最佳混凝条件,浊度去除率达90%以上,COD去除率达到85%以上的良好效果。(2)为保证回收水质达标,研究了NF90、NF270、NT101、NTR7450四种纳滤膜对混凝上清液COD去除性能,发现NF270膜污染最小,出水COD小于50 mg·L-1。以此为基础,进一步研究了操作条件,包括通量、温度、pH值等对混凝上清液纳滤去除COD效果的影响。并对纳滤浓缩液在与处理原水相同的混凝条件下处理后,COD降到430 mg·L-1左右,然后经纳滤处理,出水COD约为30 mg·L-1。(3)在小试的基础上,将试验进行放大,考察温度、跨膜压力、搅拌速度对膜运行的影响,通过试验发现,温度越高、搅拌速度越大、跨膜压力越小膜污染速度能得到明显抑制,试验放大后,产水水质能达到会用指标。(4)采用混凝-纳滤组合工艺处理整理废水,出水水质可满足GB/T19923—2005《城市污水再生利用 工业用水水质》的工业用水回用标准。;Textile printing industry is an important part of our national economic system. The production process consumes enormous water and produces huge amount of wastewater which is of high biochemical oxygen demand (COD), high chromaticity and great change of pH value, causing serious threaten to the environment. The complex processing involving different chemical additives leads to the huge difficulty in settling the discharge water. Accordingly, taking different measures for specific process will ease the difficulty of treatment of wastewater.In this paper, the coagulation-nanofiltration combined technology was developed according to the properties of components in the printing wastewater such as fiber, softener, oil, resin, slurry and so on, and the operating parameters were studied systematically. The main conclusions can be summarized as follows:(1) The performances of four flocculants (poly aluminum chloride, polymerized ferric chloride, aluminum sulfate and ferric chloride) in removing COD and turbidity in the wastewater were examined with polyacrylamide as coagulant aid, revealing that the polyaluminum chloride presented the best result. Moreover, the optimum coagulation conditions were determined through orthogonal experiments and the removal rates of turbidity and COD were more than 90% and 85% respectively under the conditions.(2) To further ensue the treated wastewater to meet the discharge standards, four NF membranes were applied to remove the COD of the supernatant from flocculation process. The results showed that NF270 exhibited the best performance with COD < 50 mg/L. Furthermore, the effect of operating conditions including flux, temperature, pH on the removal of COD in the supernatant were studied in detail. Then, the concentrate of NF process was treated by flocculation and the COD reduced to about 430mg/L, and it was lowered to around 30 mg/L after NF. (3) Based on the laboratory results, pilot experiment was conducted to examine the influence of temperature, TMP, cross-flow velocity, showing that higher temperature, higher cross-flow velocity, and lower TMP could effectively inhibit the membrane fouling with the final water meeting the discharge standards.(4)The coagulation - nanofiltration combined technology can be used to treat the wastewater to meet the industrial water reuse standard of GB/T19923 - 2005 " The reuse of urban recycling water--Water quality standard for industrial uses 

Language中文
Document Type学位论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/26916
Collection中国科学院过程工程研究所
研究所(批量导入)
Recommended Citation
GB/T 7714
刘威. 混凝-纳滤组合工艺处理印染整理废水的研究[D]. 中国科学院研究生院,2018.
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