Abstract:

It is investigated todrawmicrobial flocculant (MBF) fromthe used yeasts in beer wastewater which needn’t to be cultivated in any specially prepared nutrient medium. MBF integrating with FeO(OH) colloidal microparticle system is used as a coagulant for decoloration of direct yellow dye. The efficiency of decoloration depends on the charge density of the FeO (OH) colloidal microparticle system and the MBF solution dosage in this system. The mechanisms have been revealed. The mechanisms suggest that“residual charge”of the floc of colloidal microparticle adsorbed with the dye molecular is the main function. The experiments show that there is strong synergy between MBF and FeO(OH) colloidal microparticle systemin all experiment ranges. The decoloration rate of direct yellowdye reaches 95.5%, which is 33.6% and 82.6% higher respectively than the MBF and FeO(OH) colloidal microparticle as a single component flocculant.

Key words: colloidal microparticle, microbial flocculant, coagulant, decoloration

摘要：

从啤酒厂废酵母直接提取微生物絮凝剂，与水合氧化铁微颗粒体系集成应用于混凝脱色，其脱色效果与无机微颗粒体系的电荷密度、微生物絮凝剂剂量有关，提出无机微颗粒与染料集合体的“剩余电荷”的概念解释微生物絮凝剂-阳离子型无机微粒体系的混凝机理。结果显示微生物絮凝剂-水合氧化铁微粒体系混凝脱色在试验范围内均有显著的协同效应，直接黄最高脱色率达到95.5%，分别比单独使用水合氧化铁微粒和微生物絮凝剂提高33.6%和82.6%。

关键词: 胶体微颗粒, 微生物絮凝剂, 混凝, 脱色

CLC Number: 

• X703

• X791