疏松和紧密结合EPS在强化生物除磷中的作用  

Roles of Loosely-bound and Tightly-bound Extracellular Polymeric Substances on Enhanced Biological Phosphorus Removal

作　　者：狄寿源 龙向宇[1] 唐然[1] 方振东[1] 李达学[1] 谢朝新[1] 

机构地区：[1]后勤工程学院国防建筑规划与环境工程系,重庆401311

出　　处：《中国给水排水》2017年第9期35-39,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(21577174);重庆市基础科学与前沿技术研究专项(CSTC2015jcyjBX0012;CSTC2014jcyjA20004;CSTC2015jcyjA1286)

摘　　要：以实验室A/O-SBR反应器活性污泥为研究对象,从EPS分层的角度研究了厌氧/好氧周期中疏松结合胞外聚合物(LB-EPS)和紧密结合胞外聚合物(TB-EPS)的磷含量和形态及其金属元素含量与类型,明确了LB-EPS和TB-EPS在强化生物除磷(EBPR)中的作用。结果表明,EBPR过程是细菌细胞和TB-EPS共同作用的结果,LB-EPS和TB-EPS在EBPR中发挥不同的作用。LB-EPS中转和滞留正磷酸盐(ortho P),细菌细胞直接释放和吸收ortho P;TB-EPS是磷的主要贮存库,参与了生物聚磷,其聚磷酸盐(poly P)发生了厌氧分解和好氧合成。细菌细胞释放和吸收ortho P以及TB-EPS的poly P厌氧分解和好氧合成过程均伴随着K和Mg的释放与吸收,说明K和Mg是EBPR过程中的重要金属元素。Taking a lab-scale A/O-SBR reactor as object and fractionating extracellular polymer substances （EPS） into loosely-bound EPS （LB-EPS） and tightly-bound EPS （ TB-EPS）, the content and species of phosphorus （P） and the content and type of metallic element in LB-EPS and TB-EPS during the anaerobic and aerobic cycle were researched, in order to clarify the roles of LB-EPS and TB-EPS on enhanced biological phosphorus removal （EBPR）. The EBPR process was contributed to the combined action of both microbial cell and TB-EPS, and the roles of LB-EPS and TB-EPS on EBPR were distinct. LB-EPS only transported and retained orthophosphate （orthoP）, and microbial cell directly released and absorbed orthoP. Importantly, TB-EPS not only was a reservoir of P, but also participated in the accumu- lation process of P, of which polyphosphate （polyP） was decomposed and synthesized during the anaero- bic and aerobic cycle. During the process of orthoP release and uptake in microbial cell and polyP de-composition and synthesis in TB-EPS, the release and absorb of K and Mg happened in both microbial cell and TB-EPS, indicating that they were key metallic elements in EBPR process.

关 键 词：疏松结合胞外聚合物 紧密结合胞外聚合物 强化生物除磷 聚磷酸盐 金 属元素 

分 类 号：X703[环境科学与工程—环境工程]