摘要
采用机械混合的方法,将微生物絮凝剂MBF8与植物胶粉羧甲基改性絮凝剂CG-A复合制备了新型高效复合生物絮凝剂CBF-1.采用FT-IR、zeta(ξ)电位、透射电镜分析,确定了CBF-1的特征官能团、电荷性及分子胶束形态等物化性质;采用烧杯絮凝实验,探究了CBF-1的絮凝特性.结果表明,制备CBF-1的最佳CG-A∶MBF8质量复合比为4∶6;CBF-1为含少量沉淀物的淡黄色液体(不溶物0.013%),有效成分为0.5%,pH6.1,相对粘度1.72;有效成分0.1%时等电点约pH1.5;主要特征官能团有羟基、羧基、氨基、酰胺基及磷酸基.采用PAC(3mg·L-1)+CBF-1(1.0～8.0mg·L-1)复配絮凝,适用的pH为6.0～10.0,离子强度为0.5～5.0mmol·L-1;对浊度100NTU的高岭土悬浊液,在最佳条件PAC(3.0mg·L-1)+CBF-1(1.0～2.0mg·L-1),pH8.0,离子强度3.0mmol·L-1下,浊度去除率>92%,残余铝<75μg·L-1;对浊度6～300NTU的水,浊度去除率为61%～98%.
Compound bioflocculant （ CBF-1 ） was prepared by mechanical mixing of microbial fiocculant （MBF8） and biopolymeric floceulant （CG-A）. The functional group, electrical and the framework characteristics of CBF-1 were determined by Fourier transform infrared （FTIR） , Zeta electric potential method and transmission electron microscope （ TEM）, respectively. Moreover, the flocculating properties of CBF-1 on treating kaolin suspension were also examined. The results showed that the optimum weight ratio of CG- A ： MBF8 was 4 ： 6. CBF- 1 was pale yellow solution with 0. 013% of undissolved substance. The pH value, relative viscosity （ effective constituent O. 5% , 30 ℃ ） and isoionic point （ effective constituent O. 1% ） of such solution were 6. 1, 1.72 and pH = 1.5, respectively. The main specific functional groups were hydroxyl group, carboxyl group, amino group, amide group and phosphate group. With the PAC dosage of 3 mg＂ L - 1 and the CBF-1 dosage range from 1.0 to 8.0 mg＂ L - 1, the optimum pH value was 6.0 ~ 10.0 and the optimum ionic strength was 0.5 ~ 5.0 mmol. L - I for the Jar tests. For the kaolin suspension with turbidity of 100 NTU, the removal rate of turbidity could achieve 92% and the residual aluminum was less than 75 μg·L-l under a reaction pH of 8.0 and ionic strength of 3.0 mmol·L-l For the kaolin suspension with turbidity of 6 to 300 NTU, the removal efficiency of turbidity ranged from 61% to 98%.
出处
《环境科学学报》
CAS
CSCD
北大核心
2012年第12期2905-2911,共7页
Acta Scientiae Circumstantiae
基金
国家高技术研究发展计划资助项目(No.SQ2009AA06XK1482412)~~
