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
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摘要: 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。Abstract: Relationship between biomass, Fe2+ concentration and Fe2+ 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 oxidization rate under the experimental conditions. There existed a linear relationship between the remainder Fe2+ concentration and reacting time. The optimal conditions for the bacteria to get the highest ferrous oxidation rate may be with the Fe2+ concentration of 20 g/L and the initial inoculums concentration of 8×108/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 seawater turbidity removal.
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