摘要
合成出一种以双氰胺、甲醛为原料的阳离子印染废水高效有机脱色剂,考察了双氰胺、甲醛、硫酸铝用量和反应温度、反应时间等合成条件对双氰胺-甲醛聚合物脱色性能的影响.结果表明,优化合成工艺条件为双氰胺:甲醛:硫酸铝=1:2.58:0.35(摩尔比)、80℃、反应3h.所制脱色剂对分散红167、BES蓝、分散蓝79三种典型染料废水的脱色率均达98%以上.脱色机理主要包括吸附电中和作用、压缩双电层、吸附架桥、网捕作用.将脱色剂应用于江苏省常州市马杭污水厂混合印染废水的处理,在pH8、投加量17.5mL/L的条件下,脱色率可达96%以上,出水色度从360倍降为10倍,达到GB8978-1996一级A排放要求.
A cationic organic decoloring agent for dyeing wastewater was synthesized by using dicyandiamide and formaldehyde. The effects of dosage of dicyandiamide,formaldehyde and aluminium sulphate,reaction temperature and reaction time were considered. The results showed that the optimum conditions were as flows：molar ratio of dicyandiamide to formaldehyde to aluminium sulphate was 1：2.58：0.35,reaction temperature 80℃,and reaction time 3 h. The decoloring agent synthesized under these conditions was used to decolorise three typical dyes in wastewater,Disperse Red 167,BSE blue and Disperse Blue 79,and the decolorization efficiency could be over 98%. The mechanism of decolorization was analyzed in charge neutralization,compressing the thickness of the electric double layer,bridging adsorption and network-bashing. The synthesized agent was also used in decoloring of mixed dyeing wastewater in Mahang Wastewater Treatment Plant. When pH value and decolorant dosage was 8 and 17.5 mL/L respectively,the decolorization efficiency was 96.7%,and the chroma decresed from 360 to 10 times,the effluent met the national discharge standard GB 8978.1A-1996.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第6期1217-1221,共5页
The Chinese Journal of Process Engineering
基金
江苏省自然科学基金资助项目(编号:BK200930405)
国家水体污染控制与治理科技重大专项基金资助项目(编号:2008ZX07101-007-01)
关键词
印染废水
脱色剂
双氰胺
甲醛
dyeing wastewater
flocculating-decolorizing agent
dicyandiamide
formaldehyde
