共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
为解决当前焦化废水酚氨回收工艺中脱酚效率较低影响后续废水生化处理的效果的问题,在对焦化废水当前酚氨回收现状分析的基础上,在萃取条件、萃取级数、萃取比以及萃取剂选取四方面对工艺参数进行优化,得出通过对萃取剂进行优选可行。最终确定采用MIBK为萃取剂,并得出脱酚效率达到93%,出口酚类物质降低至350×10-6的效果。 相似文献
4.
介绍了高浓度含酚水脱酚工艺的一种方案-溶剂萃取脱酚。通过含酚水废水与溶剂在萃取塔中逆向接触,利用物质溶解度的不同实现废水和酚类物质的分离,再通过酚塔将溶剂和粗酚进行分离,粗酚作为产品进行销售,溶剂可进行循环利用。本工艺具有设备投资少,溶剂回收能耗低,酚回收效率高等特点。 相似文献
5.
《当代化工》2020,(2)
煤气化含酚废水存在处理成本高、水量大、处理工艺不稳定、难以回收等问题,为了实现煤气化高浓度含酚废水中酚类物质的回收,采用离心萃取机对煤气化高浓度含酚废水进行了连续萃取工艺研究,通过探索不同萃取剂、萃取级数、萃取温度、萃取剂与废水质量比对煤气化高浓度含酚废水萃取和脱酚效率的影响,得到了连续萃取的最佳工艺条件,最佳萃取工艺条件为:选择磷酸三丁酯作为萃取剂、萃取级数4级、萃取温度65℃、萃取剂与废水质量比为1.2∶1,离心萃取机转速3 200 r/min,萃取p H=8,实现了煤气化高浓度含酚废水在离心萃取机的连续萃取,脱酚萃取率99.8%,煤气化废水中的酚类浓度由3 175.2 mg/L降低至10.7 mg/L,结果表明,离心萃取机可以应用于煤气化高浓度含酚废水资源回收的萃取中,萃取效率高于传统间歇萃取。 相似文献
6.
树脂吸附法回收焦化废水中的酚 总被引:7,自引:0,他引:7
通过静态吸附实验确定处理焦化废水中酚的最佳吸附树脂是NDA-99超高交联吸附树脂,并通过动态实验确定了树脂吸附法处理焦化废水中酚的最佳工艺条件是:pH为4.0,吸附流量为40mL/h,单柱废水处理量为300mL/批;在50℃下用10mL质量分数为8%的NaOH 10mL质量分数为4%的NaOH 20mL水脱附,流量为10mL/h;处理后废水中挥发酚质量浓度从1380mg/L降到12mg/L,COD从15500mg/L降到650mg/L。低浓度脱附液套用,高浓度脱附液用异丙醚萃取—蒸馏法回收杂酚,实现了焦化废水中酚的资源化。 相似文献
7.
用萃取法处理含酚废水 总被引:5,自引:0,他引:5
论述了黑化集团公司如何利用萃取法处理工业含酚废水。萃取法是从高浓度含酚废水中回收酚类物质的主要方法,利用酚在萃取剂中和水中溶解度的不同而达到回收酚和净化含酚废水的目的。 相似文献
8.
9.
《化学工程》2016,(2):7-11
劣质煤在400—1 000℃处理过程中会产生高浓含酚废水,工业上可行的方法是采用酚氨回收技术对废水中有价值物质回收利用,而后将其送入后续生化处理阶段进一步处理,其中溶剂萃取是酚氨回收的关键环节。文中针对高浓含酚废水的特点,选择甲基正丁基甲酮(MBK)作为萃取脱酚溶剂,并对MBK萃取性能进行了研究。实验结果表明:MBK是一种优异的脱酚萃取剂,对挥发酚和非挥发酚都具有很好的萃取效果。在此基础上,探究了MBK最佳萃取脱酚条件,研究了温度、p H值、相比等对脱酚效果的影响。三级错流萃取实验中,用MBK做萃取剂,相比(体积比)R=1∶5,温度为40℃,p H=8.0时,可将废水中总酚质量浓度从12 700 mg/L降低到300 mg/L。实验数据可为MBK萃取脱酚的工业化实施提供参考。 相似文献
10.
蒸氨-脱酚-SBR处理兰炭废水的研究 总被引:1,自引:0,他引:1
兰炭废水是煤制焦化产品回收过程中产生的废水,其成分复杂多变,属于难处理的工业废水。兰炭废水的处理方法主要有生物法、化学法和物理化学法等三类。为开发高效且低成本的兰炭废水处理新技术,将蒸氨-脱酚-SBR结合的处理工艺,进行试验。对某厂兰炭废水进行处理,并考察微生物的适应情况以及对废水的处理效果。结果表明:蒸氨-脱酚-SBR处理工艺可以耐受废水中较高浓度的有害物质,对兰炭废水中各项污染物处理效果理想,该工艺运行成本低。 相似文献
11.
采用氢氧化钠改性的硅藻土作为吸附材料,研究了吸附剂用量、搅拌时间、pH值以及废水浓度等因素对吸附效果的影响。结果表明,在100 mL Cu2+的质量浓度为10.49 mg/L,改性硅藻土投加量为3.5 g,pH值为8.5,吸附时间为30 min的条件下,废水中Cu2+的去除率最高可达97.93%,出水Cu2+的质量浓度低于0.22 mg/L,达到了GB 8978—1996《污水综合排放标准》一级标准的要求。 相似文献
12.
以聚异丁二烯双丁酰亚胺(T-154)为表面活性剂制备乳状液膜,研究其对废水中苯酚的分离富集效果。通过单因素法和正交实验优选了乳状液膜的制备条件,即:V(T-154)∶V(液体石蜡)∶V(煤油)=4∶2∶30,质量分数3%的Na OH溶液为内水相,油内比为1∶2(体积比);将最优条件下制备的乳状液膜用于对废水中苯酚的分离富集条件为:溶液p H=6,乳水比为1∶4(体积比),富集时间为15 min;在该条件下加标回收率为96%~98%,相对标准偏差RSD(n=6)为3.7%~4.8%。 相似文献
13.
14.
以某线路板厂络合铜废水为研究对象,采用硫酸亚铁法进行破络除铜,考察硫酸亚铁投加量、废水pH值和反应时间对Cu~(2+)去除效果的影响。结果表明,调节废水p H值为3.0,硫酸亚铁投加量为20.1 g/L,搅拌反应15 min,Cu~(2+)去除效果最佳。采取先中和后加硫酸亚铁,Cu~(2+)的去除率达到99.7%,出水Cu~(2+)质量浓度为0.25 mg/L,满足GB 21900—2008《电镀污染物排放标准》的要求。利用废碱水或者显影液为碱液,不但能代替氢氧化钠和减少硫酸亚铁的用量,还能达到废物利用,以废治废的目的。 相似文献
15.
16.
Mohammad Peydayesh Pezhman Kazemi Mohammad Sadegh Nabavi 《Chemical Engineering Communications》2013,200(12):1593-1605
Transport of phenol through a flat sheet supported liquid membrane (SLM) containing cooking oil as liquid membrane (LM) was investigated. Factors affecting permeation of phenol such as membrane phase, support material, feed phase pH, stripping phase concentration, stirring speed, and initial concentration of phenol were studied. It was found that these parameters strongly influence phenol removal efficiency; PTFE membrane as support material, grape seed oil as liquid membrane, feed pH of 2.0, initial phenol concentration of 100 mg/L, stirring speed of 350 rpm, and 0.2 M sodium hydroxide as effective stripping agent were found as the best conditions for greater phenol transport. Under these conditions, permeability was found to be 7.46 × 10?6 m/s. After 10.5 h, phenol was completely removed from the feed phase to strip phase. According to stability experiments, it was observed that the SLM is stable after 22 h. Thus, the use of cheap, nontoxic, and naturally oil as a novel and green membrane for recovery of phenol from wastewater was demonstrated. 相似文献
17.
18.
19.
十六烷基三甲基溴化铵改性粉煤灰吸附酸性大红染料 总被引:1,自引:0,他引:1
采用十六烷基三甲基溴化铵(HDTMA)对粉煤灰(FA)进行改性,并使用改性后粉煤灰(MFA)吸附酸性大红染料废水。考察了pH值,改性灰的投加量和搅拌时间对酸性大红脱色率的影响,确定了最佳的吸附条件:投加量为0.4 g/50 mL,pH值为2,搅拌时间为90 min。在此条件下,对50 mL浓度为50 mg/L模拟染料废水脱色率最高,可达98%。改性灰对酸性大红染料的吸附规律可用Langmuir吸附等温式描述。通过对粉煤灰和改性灰的比表面积和扫描电镜等表征测定分析可知,HDTMA的加入增大了粉煤灰的比表面积,从而提高吸附性能。 相似文献
20.
《分离科学与技术》2012,47(1):107-124
Abstract Extraction and stripping equilibrium of phenol, p-cresol, and p-chlorophenol were studied with an organic solution containing a newly synthesized surfactant and an aqueous alkaline solution as a stripping phase. A cationic surfactant showed the highest extraction ratio of phenol among several surfactants used in this study. The magnitude of phenol extracted from water was in the order phenol < p- chlorophenol < p-cresol. The stripping of phenol extracted in the organic solution was quantitatively accomplished with an alkaline solution of high concentration except for the case of cationic surfactants. Extraction of phenol and its derivatives by liquid surfactant membranes containing a newly synthesized surfactant as an emulsifier was carried out in a stirred cell. The effects of various parameters (such as a surfactant and alkaline concentration, the kind of surfactant, and the alkali composition) on the extraction efficiency of phenol were examined along with demulsification of W/O emulsions. On the basis of the stability of surfactants against alkaline solutions used as a receiving phase, cationic surfactants which did not involve an ester or amide bond in their molecule appeared to be among the best surfactants available for phenol removal in liquid membrane operations. The efficiency of phenol recovery with sodium hydroxide as a stripping agent was much higher than that with sodium carbonate; however, the demulsification efficiency of the emulsions decreased with an increase in the content of sodium hydroxide in the mixed alkaline solutions of sodium hydroxide and sodium carbonate. In the design of an efficient recovery process of phenols by LSMs, the composition of the alkaline solution was one of the key factors. Under optimal conditions, phenolic derivatives could be recovered in a few minutes. 相似文献