SBR系统外加磁场对微生物群落多样性和处理效果的影响

发布时间：2018-06-11 19:31

本文选题：SBR + 磁场增强作用　；参考：《环境科学》2017年11期

【摘要】：SBR反应器的应用越来越普遍,为进一步提高其处理效率,提出在SBR反应体系再外加一个磁场来提高其运行性能.研究了不同磁感应强度对反应系统污染物降解效率的影响,并采用Mi Seq高通量测序技术解析了磁场条件下活性污泥微生物群落多样性变化.结果表明,磁场的加入在一定程度上提高了SBR系统的运行性能,且当磁感应强度为7×10~(-2)T时效果最明显.其中,外加磁场对SBR反应系统中总氮去除效果的影响显著,在7×10~(-2)T时脱氮率从无磁场的65.69%提高到85.98%.外加磁场显著提高了污泥脱氢酶活性,因而也会对各种污染物的去除产生积极作用.通过对不同磁感应强度下活性污泥微生物群落多样性的比较发现,7×10~(-2)T磁场下活性污泥微生物丰度及多样性最高.实验SBR反应器中的细菌域共鉴定出14个门,主要以变形菌门Proteobacteria(25.3%~61.5%)、拟杆菌门Bacteroidetes(18.6%~46.2%)、放线菌门Actinobacteria(5.3%~47.2%)、酸杆菌门Acidobacteria(0.4%~4.0%)为主.重要的脱氮细菌:如α-Proteobacteria的Rhodoblastus、Paracoccus;β-Proteobacteria的Alicycliphilus、Comamonas、Xenophilus、Acidovorax、Dechloromonas、Thauera;δ-Proteobacteria的Desulfovibrio;Planctomycetes门等,在中等磁感应强度尤其是7×10~(-2)T时,丰度最高,与脱氮效率增加有内在的联系.典型的PAOs如Acinetobacter、Pseudomonas、Propionicimonas等,在中等磁场条件下含量较高,与除磷率变化趋势相同.活性污泥中细菌群落结构变化与污水处理效率存在一定相关性,外加磁场通过改变微生物群落结构影响污水处理效果.
[Abstract]:The application of SBR reactor is becoming more and more common. In order to further improve the treatment efficiency, a magnetic field is added to the SBR reaction system to improve its performance. The effect of magnetic induction intensity on the degradation efficiency of pollutants in the reaction system was studied, and the diversity of activated sludge microbial community under magnetic field was analyzed by Mi Seq high-throughput sequencing technique. The results show that the operation performance of SBR system is improved to some extent by the addition of magnetic field, and the effect is most obvious when the magnetic induction intensity is 7 脳 10 ~ (-2) T. The effect of applied magnetic field on the removal of total nitrogen in SBR reaction system was significant, and the denitrification rate increased from 65.69% to 85.98% at 7 脳 10 ~ (-1) ~ (-2) T. The application of magnetic field can significantly increase the activity of sludge dehydrogenase, which will also have a positive effect on the removal of various pollutants. By comparing the diversity of activated sludge microbial communities under different magnetic induction intensities, it was found that the microbial abundance and diversity of activated sludge were the highest in magnetic field with 7 脳 10 ~ (10) ~ (-2) T magnetic field. A total of 14 bacteria were identified in the SBR reactor, mainly composed of Proteobacteriae 25.3B, Bacteroidetes18.662, Actinobacteria 5.32 and Acidobacteria 0.44.0. Important denitrification bacteria, such as Rhodoblastusus Paracoccusis in 伪 -Proteobacteria, Alicycliphilusphilus comamonophilus Acidovorax Dechloromonas Thauera, Desulfovibrio Planctomycetes door of 未 -Proteobacteria, have the highest abundance when the medium magnetic intensity is 7 脳 10 ~ (-2) T, which is closely related to the increase of nitrogen removal efficiency. Typical PAOs, such as Acinetobacter Pseudomonas spp., have a higher content under medium magnetic field, and the trend is the same as that of phosphorus removal rate. The change of bacterial community structure in activated sludge was related to the sewage treatment efficiency. The effect of sewage treatment was affected by changing the structure of microbial community by external magnetic field.
【作者单位】：山东农业大学资源与环境学院;
【基金】：山东省重点研发计划项目(2016CYJS05A02)
【分类号】：X172;X703

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