负荷对膜曝气生物反应器去除有机物和硝化的影响

讨论了在模拟生活废水的浓度阶段性变化的情况下,有机物负荷以及氮负荷对膜曝气生物反应器的有机物去除和硝化的影响。结果表明,TOC负荷和TN负荷分别从6.6 g/(m2.d)和3.2 g/(m2.d)到26g/(m2.d)和5.8g/(m2.d)变化,碳氮质量比从2.1到4.6变化时,得到94%～97%的TOC去除率。碳氮质量比从2.1到3.7变化时,硝化率约为90%;当碳氮质量比增加到4.6时,硝化率降到81%。在第一阶段,碳氮质量比为2.85,TN负荷从2.5到9.5 g/(m2.d)变化时,TOC去除率为95%。最大硝化速率和硝化率分别为7.5 g/(m2.d)和90%。和传统的生物膜比较,用膜曝气生物反应器处理废水,可同时提高有机物去除速率和硝化速率。

Effect of loading on organic matter removal and nitrification in membrane aeration bioreactor

The effects of organic loading and nitrogen loading on organic matter removal and nitrification in membrane aeration bioreactor under the condition that the simulant domestic wastewater concentration changing stagely were discussed.The results showed that,when the TOC loading and the TN loading varied from 6.6 g/(m2·d) and 3.2 g/(m2·d) to 26 g/(m2·d) and 5.8 g/(m2·d) respectively,the mass ratio of C to N varied from 2.1 to 4.6,the removal rate of TOC ranging between 94% and 97%.The nitrification efficiencies were about 90% when C/N ratios varied from 2.1 to 3.7,while it decreased to about 81% at C/N ratio of 4.6.In the first stage,when the C/N ratio was 2.85,the TN loading varied from 2.5 to 9.5 g/(m2·d),the TOC removal rate was 95%,and the maximum nitrification efficiency and nitrification rate were 7.5 g/(m2·d) and 90% respectively.Comparing with traditional biological membranes,membrane aeration bioreactor could improve the organic matter removal rate and the nitrification efficiency simultaneously when treating wastewater.