填料尺寸对SBBR工艺低温脱氮影响的实验研究

Effect of carrier size on denitrification in sequence batch reactor at low temperature

通过改变生物膜反应器(SBBR)的填料尺寸,探究了填料尺寸对序批式生物膜反应器低温脱氮的影响.其中三个工况采用的填料分别为边长1,1.5,2cm的立方体海绵.反应器在进水水温为(10±1)℃、运行周为12h、填料填充率为16%、曝气量为45mL/min的条件下,对模拟的城市污水进行了处理,对比分析了三个工况稳定运行期间的脱氮效果.结果表明:填充尺寸为1cm的填料时反应器低温脱氮效果最好,其中NH4+-N和TN的平均去除率分别为96%和80%,而其他工况NH4+-N和TN的平均去除率分别低于80%和70%.较小尺寸的填料具有较大的比表面积,有利于传质和微生物的富集,有效提升了SBBR的低温脱氮效能.

To improve the denitrification performance in the sequence batch reactor(SBBR)running under low temperature,three cubic carrier with diameter of 1,1.5 and 2 cm,respectively,were added to load biomass in the domestic wastewater treatment.The reactor started at(10±1)℃under the aeration rate of 45 mL/min for 12 h,and the carrier dosage was approximately 16%of the reactor volume.The results show that the optimal denitrification appeared when the carrier size was 1 cm,in which the removal rates of ammonia and total nitrogen were 96%and 80%,separately.When the carrier size increased from 1 cm to 1.5 and 2 cm,the removal rates of ammonia and total nitrogen apparently decreased by 16%and 10%.The small carrier had large BET surface area for nutrient transport and biomass proliferation,and thus dramatically improved the denitrification performance of SBBR under low temperature.The study confirmed that the size of the filler would affect the low temperature nitrogen removal of SBBR,and provided a basis for SBBR process to select a reasonable and effective filler.