摘要
考察了采用SBR法处理氨氮浓度较高的化工废水时供氧方式对硝化过程中DO、ORP和pH值变化规律的影响。试验结果表明 ,在曝气量恒定的条件下 ,可以硝化过程中DO和pH值升高速率的不同表征反应的进行程度 ,即当氨氮浓度接近零时 ,DO和 pH值升高速率或变化幅度加大 ,二者可以作为SBR硝化反应时间的控制参数 ,而ORP值对SBR硝化反应结束的指示作用不是很明显 ;在DO量恒定的情况下 ,pH值在整个硝化反应过程中都是缓慢下降或趋于稳定的 ,当硝化反应结束时突然升高 ,因此 pH值也可作为SBR硝化反应时间较好的控制参数 ,而ORP值在硝化反应的初期快速升高 ,之后升高的速度越来越慢直至趋于平稳 ,它对SBR硝化反应结束的指示作用同样不是很明显。
In the use of SBR process for treatment of chemical wastewater with high NH-3-N concentration, investigation was made for the effect of oxygen supply on DO, ORP and pH variation in nitrification process. The result showed that under the fixed aeration rate, different rising rate of DO and pH may be used to express the progress of nitrification, that is, when NH-3-N concentration approaches zero, the increase occurs in the rising rate and variation range of DO and pH, the both can be used as parameters for controlling nitrification time, and ORP gives no obvious indication of the ending of nitrification. Under the fixed DO, pH drops slowly or tends to be stable in whole course of nitrification, and abruptly rises in the ending of nitrification. Therefore, pH is also a desired controlling parameter in SBR nitrification; while OPR rises rapidly in the initial stage of nitrification, and then it rises at slower and slower speed until it approaches to stability, it also does not indicate distinctly the finishing of SBR uitrification.
出处
《中国给水排水》
CAS
CSCD
北大核心
2002年第10期1-5,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目 (5 0 1380 10 )
北京市自然科学基金项目 (80 0 2 0 0 5 )
