摘要
将臭氧氧化技术和A2/O生物脱氮除磷工艺相结合,考察了同时实现污泥减量和碳源回收用于生化系统脱氮除磷的可行性。A2/O工艺运行稳定后,控制臭氧浓度为25 mg/L,对剩余污泥连续破解并投加到缺氧池。结果表明:经臭氧氧化后,混合液中的SCOD浓度增加到氧化前的3.5倍,对SS和VSS的去除率分别可达46.8%和42.3%;经过臭氧氧化的剩余污泥回流到A2/O系统后,使C/N和C/P值均提高了约一倍,但是脱氮除磷效率却没有提高。这是因为DO浓度过高,破坏了厌(缺)氧环境;同时,所释放的COD中能够被微生物快速利用的较少。
Sludge ozonation was combined with the A2/O process to investigate the feasibility of simultaneously sludge reduction and carbon source recovery for biological nitrogen and phosphorus removal （BNPR）. After the A^2/O process operation was steady, the concentration of ozone was controlled at 25 rag/L, and the disrupted excess sludge was added into anaerobic tank continuously. The results showed that after ozonation, the concentration of SCOD increased to 3.5 times compared to before ozonation, and the removal rates of SS and VSS were 46.8% and 42.3% , respectively. The C/N and C/P ratios roughly doubled after the backflow of ozonized sludge, however, there was no improvement in the efficiency of BNPR. The reason was the high DO concentration destroying the anaerobic or anoxic environment. Meanwhile, less COD was available for microorganisms.
出处
《中国给水排水》
CAS
CSCD
北大核心
2014年第1期18-21,共4页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2009ZX07314-002)
