序批式工艺制备生物聚合硫酸铁混凝剂

Production of bio-polymeric ferric sulfate coagulant by sequencing batch reactor

本实验研究了序批式工艺(SBR)制备生物聚合铁混凝剂过程中主要影响因素(接种微生物浓度、起始亚铁离子浓度)对亚铁离子氧化速率的影响。研究结果显示,在受试实验条件内,较高的接种微生物浓度和较低的起始Fe2+浓度有利于Fe2+氧化,Fe2+浓度变化与反应时间呈线性关系;当起始Fe2+浓度为20 g/L,接种细菌浓度约为8×108个/mL时,Fe2+氧化速率最大,最大值可达到0.375 g/(L.h)。在反应过程中生成了少量黄色沉淀,经傅里叶变换红外光谱分析后确定其主要成分为黄钾铁矾。合成的生物聚合硫酸铁经过干化后各项指标均符合《水处理剂聚合硫酸铁》(GB 14591-2006)之规定。对比实验表明,自制生物聚合硫酸铁海水混凝时性能优于实验所选品牌的商业产品。

Relationship between blomass, Fe^2＋ concentration and Fe^2＋oxidation rate in sequencing batch reactor（SBR） was investigated to produce bio-polymeric ferric sulfate coagulant （BPFS）. Results revealed that larger initial inoculums concentration and lower initial ferrous ion concentration induced the higher ferrous ion ox- idization rate under the experimental conditions. There existed a linear relationship between the remainder Fe^2＋concentration and reacting time. The optimal conditions for the bacteria to get the highest ferrous oxidation rate may be with the Fe^2＋ concentration of 20 g/L and the initial inoculums concentration of 8 ×10^8/mL. Jarosite was synthesized during the ferrous biological oxidation process. After being dried, the essential properties of BPFS completely met PRC＇ s state standard. BPFS＇ s performance in seawater coagulating compared with a commercial product were investigated, results showed that BPFS performed better than chosen commercial product in seawa- ter turbidity removal.