摘要
以A^2/O-生物接触氧化(BCO)系统反硝化除磷活性污泥为研究对象,通过投加适宜的碳源(乙酸钠,折合COD为200mg/L)和NO_3--N(30mg/L),考察了反硝化聚磷菌(DPAOs)在不同厌/缺氧反应时间下的内碳源转化利用情况对脱氮除磷特性的影响.结果表明:厌氧反应时间为90min时,聚羟基脂肪酸酯(PHA)的合成量最大,释磷基本结束;厌氧时间过长(120,150min)导致PHA的无效损失,会直接影响缺氧反硝化除磷作用,且对于吸磷作用的抑制明显强于硝酸盐反硝化作用.厌氧释磷良好的条件下,缺氧反应120min时PHA消耗量较大,内碳源利用充分,氮磷去除完全;缺氧时间过短(60min)则反应不完全,时间过长(180,240,300min)会导致糖原(Gly)部分降解,间接影响反硝化除磷作用,不利于反应的长期进行.此外,在短期试验中,因厌氧时间过长造成的PHA无效损失,对反硝化除磷作用的影响明显大于缺氧时间设定过长时Gly的降解.
Denitrifying polyphosphate accumulating organisms（DPAOs） could remove N and P simultaneously when exposed to sequential anaerobic-anoxic conditions. The key factor of denitrifying phosphorus removal by DPAOs was the conversion and utilization of internal carbon source. To evaluate the effect of conversion and utilization of internal carbon source on the removal of nitrogen and phosphorus, batch experiments were conducted with different anaerobic/anoxic reaction time using denitrifying phosphorus activated sludge taken from an anaerobic/anoxic/oxic（A^2/O）-biological contact oxidation（BCO） system. The results showed that DPAOs produced the highest amount of poly-β-hydroxyalkanoate（PHA） and finished phosphorus release when anaerobic reaction time was 90 min, while too long anaerobic reaction time（120, 150min） led to the decrease of PHA and affected denitrifying phosphorus removal. Additionally, the effect of long anaerobic reaction time on phosphorus absorption was more significant than that on denitrification by NO_3--N, and the specific phosphorus uptake rate suffered a 30 percent fall when extending the anaerobic reaction time to 150 min. Under the appropriate anaerobic conditions, the optimal anoxic reaction time for nitrogen and phosphorus removal was 120 min. The nitrogen and phosphorus removal couldn＇t finish with a short reaction time（60min）, while Gly was partially degraded with long anoxic reaction time（180, 240, 300min）, denitrifying phosphorus removal was indirectly affected, and it was of no advantage to the long-term operation. Furthermore, in a short time, the impact of long anaerobic reaction time on the nitrogen and phosphorus removal was greater than that of long anoxic reaction time.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第3期989-997,共9页
China Environmental Science
基金
国家自然科学基金资助项目(51578014)
北京市教委资助项目
关键词
反硝化除磷
厌/缺氧反应时间
PHA
糖原
比反硝化吸磷速率
denitrifying phosphorus removal
anaerobic/anoxic reaction time
PHA
Gly
specific denitrifying phosphorus removal rate
