共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
在国内某综合性钢铁厂的零排放工程中,对生产排放的电厂脱硫废水、烧结制酸废水、焦化废水反渗透浓水及树脂再生废液进行预处理除氟。工程实践中,可以利用废水自身“高硬高氟”特点,通过调碱沉淀工艺除氟,可减少药剂费用,其除氟效率不高,平均仅为33%,需在零排放工程中浓缩水量减少后再进行末端除氟。然而,采用PAC絮凝除氟工艺,除氟效果好,PAC投加量为200~400 mg·L-1时,除氟效率达到59%~80%。 相似文献
3.
煤化工企业的焦化废水最常用的除氟方法是化学沉淀法和混凝沉降法,处理后的废水含氟量一般在10~25 mg/L左右,仍高于国家的排放标准,需进一步处理.欣格瑞(山东)环境科技有限公司自行研制液体高效除氟剂SGR-0628,专门针对低浓度含氟废水的处理.使用方法十分方便快捷,反应迅速,处理后氟离子质量浓度可降至2 mg/L以... 相似文献
4.
氟涂料在工业中得到广泛应用,其废水的处理自然成为人们日益关注的问题。除氟的方法很多,使用沉淀法对其进行处理比较适用。本文对化学沉淀法和混凝沉淀法处理氟涂料废水有关情况进行了综述,以期对氟涂料废水处理的研究起到促进作用。 相似文献
5.
6.
7.
8.
10.
11.
12.
13.
14.
饮用水除氟技术的现状及进展 总被引:4,自引:1,他引:3
综述了国内对于饮用水除氟的方法,包括吸附法、沉淀法、电凝聚法,电渗析法,同时讨论了除氟方法的机理,并且对这些方法进行了总结,以促进实践发展。 相似文献
15.
焦化废水处理技术现状与进展 总被引:1,自引:0,他引:1
通过分析我国焦化废水治理的现状,重点从生物和化学两个方面介绍了当前先进有效的几种焦化废水处理技术,并详细叙述了各种技术的技术原理和处理效果。 相似文献
16.
介绍了FJL-40型气浮除油机结构、除油原理和气浮除油的影响因素。对焦油车间废水的除油试验表明。该除油机具有除油效率高、操作简单和生产成本低等优点,值得推广应用。 相似文献
17.
18.
19.
《分离科学与技术》2012,47(8):1135-1145
Fluoride forms a common aqueous effluent in many chemical industries. Excess of fluoride in the effluent can cause a health hazard. So, effluent containing fluoride needs treatment to reduce its concentration to a disposable value before discharging into public sewage. Removal of fluoride ion from model water solutions was investigated using polyamide thin film composite reverse osmosis and nanofiltration membranes. The effects of feed pressure, concentration, ionic strength, nature of cation associated to fluoride, and pH on the retention of fluoride ions were studied. Membranes were used to reduce fluoride ions and total salinity of a metal packaging industrial effluent. The retention of fluoride exceeds 90% for both membranes. This was found to depend on feed concentration, ionic strength, pH, and applied pressure. The Spiegler-Kedem model was applied to experimental results to determine phenomenological parameters σ and Ps, the reflection coefficient of the membrane and the solute permeability coefficient of ions. The convective and diffusive parts of the mass transfer were quantified with predominance of the diffusive contribution. 相似文献
20.
The treatment of industrial chrome tanning effluents by electrocoagulation (EC) in a laboratory‐scale reactor was investigated. Mild‐steel (MS) electrodes have been found to outperform aluminum (Al) electrodes in reducing the Cr(III) concentration to <2 mg L–1. The conversion of Fe(II) to Fe(III) is slow in the lower pH range (<6), and OH– ions generated during EC are amply available for Cr(III) removal by precipitation in the case of the MS electrode. Formation of Al(OH)3(s) in competition with Cr(OH)3(s) while consuming the OH– ion is a cause for lower Cr(III) removal with Al. EC with the MS electrode and chemical coagulation (CC) with addition of alkali proved to be equally efficient for removing Cr(III). 相似文献