摘要
锰致“黄水”是城市供水管网系统亟待解决的问题之一,其重要原因是管网消毒剂不足时锰氧化细菌介导的二价锰(Mn(Ⅱ))氧化。为探究供水管网中锰氧化细菌作用下的锰迁移转化机制,利用一株从实际管网中获取的锰氧化细菌-短芽孢杆菌MYH-1,研究pH、Ca^(2+)浓度和初始Mn(Ⅱ)浓度等因素变化对其Mn(Ⅱ)氧化特性的影响。结果表明,较高的pH和Ca^(2+)浓度会加快MYH-1的Mn(Ⅱ)氧化速率,而初始Mn(Ⅱ)浓度越高Mn(Ⅱ)氧化速率越慢。随着pH的升高,Mn(Ⅱ)氧化率也逐渐升高,pH=9.00时,最大Mn(Ⅱ)氧化率为98.41%;当Ca^(2+)浓度≥30.00 mg/L时,MYH-1的Mn(Ⅱ)氧化率得到极大提升;初始Mn(Ⅱ)浓度与MYH-1的Mn(Ⅱ)氧化率呈负相关关系,初始Mn(Ⅱ)浓度为25.00 mg/L时,最大Mn(Ⅱ)氧化率为90.98%。三种因素对该菌株Mn(Ⅱ)氧化特性的影响大小排序为:pH>初始Mn(Ⅱ)浓度>Ca^(2+)浓度。
"Yellow water"caused by manganese is one of the urgent problems in urban water supply system.The main reason is that when there is insufficient disinfectant at the end of the drinking water distribution systems(DWDSs),the oxidation of residual Mn(II)by microorganisms(mainly manganese oxidizing bacteria)will produce a large amount of granular Mn(III,IV).In order to explore the migration and transformation mechanism of manganese in the DWDSs under the action of microorganisms,a manganese oxidizing bacteria in the water supply network,Bacillus brevis MYH-1,was used to explore the effects of changes in water quality conditions such as pH,Ca^(2+)concentration and initial Mn(II)concentration on its manganese oxidation characteristics.The results showed that higher pH and Ca^(2+)concentrations accelerated the Mn(II)oxidation rate of MYH-1,and the higher the initial Mn(II)concentrations,the slower the Mn(II)oxidation rate was.With the increase of pH,the Mn(II)oxidation ratio gradually increased.When pH=9.00,the maximum Mn(II)oxidation ratio was 98.41%.The initial Mn(II)concentrations were negatively correlated with the Mn(II)oxidation ratio of MYH-1.When the initial Mn(II)concentration was 25.00 mg/L,the maximum Mn(II)oxidation ratio was 90.98%.Compared with no addition of Ca^(2+),the oxidation ratio of Mn(II)was inhibited when the concentration of Ca^(2+)was less than 30.00 mg/L,and promoted when the concentration of Ca^(2+)was higher than 30.00 mg/L.The effects of three factors on Mn(II)oxidation characteristics of this strain were ranked as pH>initial Mn(II)concentration>Ca^(2+)concentration.
作者
苗梓怡
张卉
刘卓
王龙
冯永嘉
贾培馨
MIAO Ziyi;ZHANG Hui;LIU Zhuo;WANG Long;FENG Yongjia;JIA Peixin(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology;Key Laboratory of Northwest Water Resources and Environmental Ecology of Ministry of Education,Xi'an University of Architecture and Technology:Xi'an 710055,China)
出处
《水处理技术》
北大核心
2026年第3期52-56,共5页
Technology of Water Treatment
基金
陕西省自然科学基础研究计划重点项目(2021JZ-50)
陕西省青年创新团队项目基金(21JP065)。
关键词
锰氧化细菌
锰氧化
短芽孢杆菌
给水管网
manganese oxidizing bacteria
manganese oxidation
bacillus breve
drinking water distribution systems
