摘要
在SBR反应器中,分别以絮状活性污泥培养的好氧颗粒污泥和直接接种的已稳定运行1 a的好氧颗粒污泥为对象,对2种颗粒龄不同的颗粒污泥的形态、理化特性、对有机物降解能力以及微生物活性进行了比较研究.结果表明,小颗粒龄好氧颗粒的平均湿密度、污泥的比重和表示物理强度的完整系数(IC)分别为1.066 g.cm-3、1.013 g.cm-3和98.7%,各指标均高于大颗粒龄好氧颗粒的1.026 g.cm-3、1.010 g.cm-3和98.4%,两者的平均粒径分别为1.9 mm和2.2 mm.小颗粒龄好氧颗粒和大颗粒龄好氧颗粒的沉降速度分别为0.005～0.032 m.s-1和0.003～0.028 m.s-1,前者的SVI较低,且两体系中好氧颗粒的沉降速度均随粒径的增大而增大.两者对COD、NH4+-N的去除率都保持在90%以上和85%左右,从出水COD浓度、NH4+-N浓度和周期试验来看,小颗粒龄好氧颗粒对COD、NH4+-N的去除效果更好,两者对TP的去除率分别维持在40%～90%和32%～85%,但两者对TN的去除效果相差不大,去除率都在80%左右.同时,小颗粒龄好氧颗粒的异养菌比耗氧速率(SOURH)、亚硝酸菌比耗氧速率(SOURNH4)、硝酸菌比耗氧速率(SOURNO2)分别为26.4、14.8和11.2 mg.(h.g)-1,均大于大颗粒龄好氧颗粒的25.2、14.4和8.4 mg.(h.g)-1.综上所述,好氧颗粒污泥由于颗粒龄的不同会具有明显不同的理化性质,颗粒龄小的好氧颗粒具有更好的有机物降解能力、更高的微生物活性和更好的稳定性.
In the SBR reactor,we studied the different style,physicochemical characteristic,pollutants removal and microbial activity between the short age and long age aerobic granule,respectively.The short age aerobic granule was cultivated from activated floccules sludge and the other was gotten from aerobic granular sludge which was operated stably more than one year.The results indicated that the wet density,the specific gravity and integrated coefficient（IC） of the short age aerobic granule were 1.066 g·cm-3,1.013 g·cm-3and 98.7%,respectively.And that of long age were 1.026 g·cm-3,1.010 g·cm-3and 98.4%,respectively.All of them were higher than the long age aerobic granule.The mean diameters of them were 1.9 mm and 2.2 mm,respectively.The settling velocity of short age and long age aerobic granule were 0.005-0.032 m·s-1 and 0.003-0.028 m·s-1,respectively,and two kinds of aerobic granule settling velocity increased with the diameter increased.SVI of the former was lower.The COD removal rates of two aerobic granules were above 90%,and the NH＋4-N removal rates of them were about 85%.The results of the COD effluent concentration,NH＋4-N effluent concentration and the pollutants concentration in a typical cycle indicated that the short age aerobic granule had better pollutants removal efficiency.The TP removal rates of them were between 40%-90% and 32%-85%,respectively.The TN removal rates of them were about 80%.The SOURH,SOURNH4 and SOURNO2 of the short age aerobic granule were 26.4,14.8 and 11.2 mg·（h·g）-1,respectively.And that of long age were 25.2,14.4 and 8.4 mg·（h·g）-1,respectively.In summary,the aerobic granule had significantly different physical and chemical characteristics because of different granule age,and the short age aerobic granule exhibited better pollutants removal ability,higher microbial activity and more stability than the long age aerobic granule.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2012年第3期896-902,共7页
Environmental Science
关键词
好氧颗粒
颗粒龄
粒径
理化性质
稳定性
aerobic granule
granule age
diameter
physicochemical characteristic
stability
