摘要
以合成废水为研究对象,比较了SBR单级好氧工艺以2种典型基质(R1:葡萄糖;R2:乙酸钠)作为碳源时的除磷效果,试验运行方式为瞬时进水→曝气(4 h)→沉淀、静置(8 h)→瞬时出水.结果表明,在稳定运行中R1磷的去除效率明显高于R2.R1、R2中好氧曝气段反应器中单位混合液挥发性悬浮固体(MLVSS)的总磷(TP)去除量约为7.2～7.7、3.8～4.6 mg.g-1,静置期单位MLVSS的TP释放量分别为3.6～3.8、2.7～3.1 mg.g-1.R1反应过程中微生物体内储能物质多β羟基烷酸盐(PHA)含量并没有明显的变化,但糖原质浓度在曝气30 min时增长到最大值,曝气结束时微生物体内糖原质水平消耗到微生物的原始水平;R2中PHA和糖原质在曝气约45 min时均观察到最大的积累量.本研究试验现象表明在R1反应器中糖原作为其好氧段主要的能源物质为其生物代谢提供能量,而在R2反应器中其主要的能量来源于PHA的分解辅以糖原的水解,这也表明在单级好氧生物除磷过程中糖原质能代替传统厌氧/好氧(A/O)工艺中的PHA成为微生物的能源物质,且由于R1比R2有更多的糖原质的积累,使得R1中磷的去除效率高于R2.
To investigate the performances of phosphorus removal in a sequencing batch reactor（SBR） with single-stage oxic process using synthetical wastewater,glucose（R1） and acetate（R2） were fed to two SBRs as the sole carbon source,respectively.The operation run mode was determined to be： influent→aeration（4 h） →settling（8 h） →effluent.The results showed that the performance of phosphorus removal in R1 was higher than that in R2 after steady-operation.Total phosphorus（TP） removed per MLVSS in R1 and R2 were 7.2-7.7 and 3.8-4.6 mg·g^-1 during aeration,respectively,but the rate of phosphorus release at the two reactors were 3.6-3.8 and 2.7-3.1 mg·g^-1 during the idle zone,respectively.The energy storage of poly-β-hydroxyalkanoates（PHA） was constant nearly in R1 during the whole period,but glycogen was accumulated to the maximum value at 30 minutes of aeration,and then was decreased to the initial level.However in R2,PHA and glycogen were both accumulated at about 45 minutes of aeration.This phenom.enon suggested that glycogen is the main energy source for metabolism during aerobic period in R1,and the main energy resource come from the decomposition of PHA and the hydrolysis of glycogen in R2.The facts showed that glycogen could replace PHAs to supply energy for phosphate uptake and polyphosphate accumulation in such a single-stage oxic process.Since glycogen accumulated in R1 was more than that in R2,the efficiency of phosphorus removal in R1 was higher than that in R2.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第1期124-128,共5页
Environmental Science
基金
教育部新世纪优秀人才支持计划项目(NCENT-0770)
国家自然科学基金项目(50478054)
国际科技合作重点项目(2004DFA06200)
长沙市科技计划重点项目(K051132-72)
关键词
单级好氧法
生物除磷
PHA
糖原
聚磷
single-stage oxic process
biological phosphorus removal
poly-β-hydroxyalkanoates（PHA）
glycogen
poly-p
