摘要
对天津经济技术开发区污水处理厂采用先进的DAT-IAT工艺进行冬季和夏季的实际运行效果比较,并就DAT池和IAT池在运行中的作用进行分析。研究发现:污水处理厂对BOD的平均去除率在96%以上,对COD的平均去除率在75%左右,均能保证出水达标,对于BOD和COD的去除效果冬季和夏季无明显差别,对SS的去除效果冬季略优于夏季,DAT-IAT工艺系统的抗冲击负荷能力较强,污水处理厂DAT池过高的BOD去除率对后续的脱氮除磷效果会产生不利影响。影响处理效果的原因主要为污水处理厂进水量不充足,水质水量变化大,且ρ(BOD)/ρ(COD)值偏低,不利于生化处理。此外,DAT池的非限制性曝气工艺不仅使BOD在DAT池中过度消耗,影响后续处理,而且浪费能源,建议减少DAT池曝气时间或调整DAT池运行参数。
The advanced DAT-IAT （Demand Aeration Tank-Intermittent Aeration Tank） technique was used in the sewage treatment plant in Tianjin Economic and Technological Development Area. The operating effect in summer and winter was studied and compared, and the functions of DAT tank and IAT tank were analyzed. Results show that the average removal rate of BOD can reach 96%, and that of COD is around 75%, both meeting the discharge standard. The removal efficiency of BOD and COD was almost the same in summer and winter, while that of SS in winter is better than that in summer. The DAT-IAT technique system has strong ability to resist the striking loads. The exorbitant removing rate of BOD in DAT tank has hannful effects on the removal of phosphorus and nitrogen, which are mainly caused by insufficient influent quantity, distinct variation of water quality and quantity, the low ratio of BOD/COD, and all of these are unfavorable biochemical degradation. Besides, the nonrestrictive aeration processing in DAT tank not only causes the excessive consumption of BOD and is harmful to the following treatment, but also wastes energy. It is suggested that the aeration time be shortened or the operation parameter of DAT tank be adjusted.
出处
《水资源保护》
CAS
北大核心
2007年第3期70-73,共4页
Water Resources Protection
关键词
污水处理工艺
有机物
去除率
COD
BOD
SS
sewage treatment techniques
organic matter
removal efficiency
COD
BOD
KS
