摘要
通过选取不同污水处理厂及实验室改进A2/O反应器曝气池内的活性污泥进行实验,研究了不同密度污泥的耗氧需求以及其节能特性。研究发现,实验所用污泥密度分别为1.004 1、1.003 3、1.001 7、1.001 3和1.000 6 g·m L-1时,其实际耗氧量与理论需氧量比值(Cresp/Craw)分别为0.42、0.61、1.38、1.44和1.69,即当污泥密度越大,则污泥在去除污染物质的过程耗氧量越小,节能性能越好,且其节能程度与微生物用于自身基础代谢的内源呼吸速率比例有关,内源呼吸速率比例越小,污泥越节能。另外通过对不同密度活性污泥进行短期冲击实验,研究发现在非稳态环境中,密度小的污泥用于基础代谢的能量多,而用于生长代谢的少,其稳定性能较好。
The actual oxygen consumption demand and energy-saving characteristics were investigated by u- sing samples from different WWTPs and a laboratory-scale modified A2/O process. The results showed that when the densities of the sludge were 1.004 l, 1. 003 3, 1. 001 7, 1.001 3, and 1.000 6 g·mL-l, the ratios be- tween the actual oxygen consumption and the theoretical oxygen demand （ Creap/Craw） were 0. 42, 0.61, 1.38, l. 44, and 1.69, respectively. This implies that the denser the sludge, the less the energy required for contami- nant removal, i. e. , indicating energy saving. In addition, the level of energy saving was related to the endoge- nous respiration rate ratio for the basic metabolism of microorganisms, i. e. , the smaller the endogenous respira- tion ratio, the more the energy saving. In addition, a short-term shock was carried out on activated sludge with different densities. The results showed that with an unsteady status, more basic metabolic energy and less growth- related energy were used for smaller density sludge, resulting in a more stable status.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期4907-4911,共5页
Chinese Journal of Environmental Engineering
基金
陕西省科技计划国际合作项目(2013KW2201)
2013年博士点基金联合项目(20136120110002)
关键词
密度
耗氧量
节能
内源呼吸速率比例
稳定性
vdensity
oxygen consumption
energy saving
endogenous respiration rate ratio
stability
