Effective treatment of cadmium-cyanide complex by a reagent with combined function of oxidation and coagulation

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Effective treatment of cadmium-cyanide complex by a reagent with combined function of oxidation and coagulation
	Hu, Chengzhi; You, Liyan; Liu, Huijuan; Qu, Jiuhui
刊名	CHEMICAL ENGINEERING JOURNAL
	2015-02-15
卷号	262 期号:0 页码:96-100
关键词	Cyanide Heavy metal Oxidation Coagulation Water treatment
英文摘要	The treatment of heavy metal-cyanide complex in industrial wastewater generally involves various processing units, such as chemical oxidation, hydrolysis precipitation and coagulation. A novel dual function reagent (PACC), which contains high content of active chlorine and Al-13 polymer, shows a promising potential to shorten the process and heighten the treatment efficiency for cadmium-cyanide complex ([Cd(CN)(4)](2-)). The results indicated that PACC is able to simultaneously achieve the complete oxidation of cyanide (CN-) by active chlorine and the subsequent coagulation of cadmium ion (Cd2+) by Al-13 polymer. Two stagek were carried out for complete CN- oxidation and effective Cd2+ coagulation. The first stage involves the conversion of CN- to cyanate (CNO-), and the second stage involves the conversion of CNO- to nitrogen and the coagulation of the liberated Cd2+. The optimum pH values for the first stage and the second stage are pH 11 and pH 8.5, respectively. The two stages for effective treatment of [Cd(CN)4](2-) at the optimal pH condition totally need about 43 min at active chlorine dosage 130% of the theoretical requirement for CN- decomposition. Under the optimal conditions for [Cd(CN)4]2- treatment, the stoichiometric weight ratio of Cl-2/Al in PACC is 2. This study presents a novel reagent and method to remove heavy metal-cyanide complexes from wastewater. (C) 2014 Elsevier B.V. All rights reserved.
研究领域[WOS]	Engineering, Environmental ; Engineering, Chemical
WOS记录号	WOS:000347577700012
公开日期	2016-03-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32760]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Hu, Chengzhi,You, Liyan,Liu, Huijuan,et al. Effective treatment of cadmium-cyanide complex by a reagent with combined function of oxidation and coagulation[J]. CHEMICAL ENGINEERING JOURNAL,2015,262(0):96-100.
APA	Hu, Chengzhi,You, Liyan,Liu, Huijuan,&Qu, Jiuhui.(2015).Effective treatment of cadmium-cyanide complex by a reagent with combined function of oxidation and coagulation.CHEMICAL ENGINEERING JOURNAL,262(0),96-100.
MLA	Hu, Chengzhi,et al."Effective treatment of cadmium-cyanide complex by a reagent with combined function of oxidation and coagulation".CHEMICAL ENGINEERING JOURNAL 262.0(2015):96-100.