在移动床生物膜反应器中，聚乙烯生物载体的表面改性对生物膜特性和废水处理效率的影响。

Influence of surface modification of polyethylene biocarriers on biofilm properties and wastewater treatment efficiency in moving-bed biofilm reactors.

机构信息

Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, China.

出版信息

Water Sci Technol. 2012;65(6):1021-6. doi: 10.2166/wst.2012.915.

DOI:10.2166/wst.2012.915

Abstract

Two methods of surface modification of polyethylene biocarriers, chemical oxidation-surface covering with ferric ion (CO-SCFe) and chemical oxidation-surface grafting with gelatin (CO-SGG), were studied for improving the efficiency of wastewater treatment by moving-bed biofilm reactors. The results showed that two surface modifications caused corrosion pits to increase surface roughness, and brought -(C=O)-/-O-C-O- groups and ferric ions to the biocarrier surface, respectively. The positively charged surface increased the hydrophilicity and biological affinity of the biocarrier. The biofilm formation rate was improved by 37.5 and 60% after surface modifications of CO-SCFe and CO-SGG; the concentration of biomass on the biocarriers was improved by 54.8 and 76.1% and the COD removal efficiencies were increased by 10.63 and 8.64%, respectively. Polymerase chain reaction-denaturing gradient gel electrophoresis analysis showed that the microbial populations in the biofilm were almost the same after surface modifications, but the biomass concentration was greatly increased.

摘要

两种聚乙烯生物载体表面改性方法，即化学氧化-表面覆盖铁离子（CO-SCFe）和化学氧化-表面接枝明胶（CO-SGG），被研究用于提高移动床生物膜反应器处理废水的效率。结果表明，两种表面改性方法均导致腐蚀坑增加表面粗糙度，并分别在生物载体表面引入了-(C=O)-/-O-C-O-基团和铁离子。带正电荷的表面提高了生物载体的亲水性和生物亲和性。经过 CO-SCFe 和 CO-SGG 的表面改性后，生物膜的形成速率分别提高了 37.5%和 60%；生物载体上的生物量浓度分别提高了 54.8%和 76.1%，COD 去除效率分别提高了 10.63%和 8.64%。聚合酶链反应-变性梯度凝胶电泳分析表明，表面改性后生物膜中的微生物种群几乎相同，但生物量浓度大大增加。