摘要
采用序批式活性污泥法系统研究了Fe(Ⅲ )对活性污泥絮体结构和生物絮凝作用的影响 ,结果发现Fe(Ⅲ )降低了污泥沉降指数 ,同时也减弱了污泥的生物絮凝作用 .对细胞外高分子 (EPS)的电子能谱元素分析表明在EPS中发生了阳离子间的交换作用 ,Fe(Ⅲ )置换出EPS中一价和二价金属阳离子 .污泥絮体的扫描电镜显示Fe(Ⅲ )使活性污泥絮体颗粒变小变密实 ,但是Fe(Ⅲ )与EPS之间的作用和含磷沉淀物的生成削弱了污泥颗粒形成较大生物聚集体的能力 .Fe(Ⅲ )对生物絮凝作用的影响主要是通过架桥机理和藻酸盐理论来实现的 。
The effects of Fe(Ⅲ) on the floc surface properties and bioflocculation of activated sludge were investigated in sequencing batch reactors (SBRs). The results showed that Fe(Ⅲ) improved settleability, but deteriorated the bioflocculation of the sludge. The elemental analysis of the extracellular polymeric substances (EPS) by energy dispersive spectrometry (EDS) demonstrated that Fe(Ⅲ) had greater affinity to EPS than other cations and this led to ion-exchange in EPS which replaced other cations from within the flocs. Scanning electronic microscopic (SEM) observations suggested Fe(Ⅲ) make the flocs smaller and more compact, but the interactions between Fe(Ⅲ) and EPS, along with phosphorus containing precipitates, reduced the amount of EPS available for the formation of large aggregates. The role of Fe(Ⅲ) in bioflocculation of activated sludge is cation bridging and alginate theory while charge neutralization playing an insignificant part.
出处
《环境科学学报》
CAS
CSCD
北大核心
2003年第5期582-587,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目 (批准号 :5 0 1780 6 7)
关键词
Fe(Ⅲ)
活性污泥
絮体结构
生物絮凝
污水处理
activated sludge
bioflocculation
settleability
extracellular polymeric substances
