问题 单项选择题

某城市污水处理厂规模为10000m3/d,总变化系数为1.58,采用SBR工艺,周期运行时间为8h,其中进水2h、反应4h、沉淀1h、排水1h,反应池内混合液悬浮固体平均浓度采用3.5gMLSS/L,进水BOD5为200mg/L,污泥负荷采用0.1kgBOD5/(kgMLSS·d),则SBR反应器的组数及每组反应器的容积分别为()。

A.3组,7619m3

B.3组,1203m3

C.4组,2857m3

D.4组,5714m3

答案

参考答案:C

解析:

根据《室外排水设计规范》(GB 50014—2006),根据式(6.6.38—1),可确定为4组。

根据该规范第6.6.36条,Q为每个周期的进水量(m3),有

完形填空

Mr Smith was a wealthy industrialist, but he was not satisfied with life. He did not sleep well and his food did not  21  with him. The situation lasted for some time. Finally, after a   22  of sleepless nights, he decided to consult his doctor. The doctor advised a change of  23 . “Go abroad,” he said, “But I’m not good at foreign languages,” said Mr Smith. “It doesn’t matter,” said the doctor. “It won’t   24  you to talk a little less. Go on a voyage. Take plenty of exercise. Try to reduce your weight,  25  rich food.”

Mr Smith went to Switzerland. He did not know French or German, and had to communicate through gestures. He attended a physical training course. The instructor made him bend his knees, swing his arms, stretch his neck and shake his head rapidly. He had to lie on the ground and raise his right and left legs   26  . After a time his muscles grew hard and firm. The life suited him; he almost put aside his financial  27  and nearly forgot the importance of making more money. He even began to  28  individual trees and individual birds. He ate and slept well. Finally he returned home. But unfortunately his improvement was temporary. Soon he was a   29  businessman again, worried about his property, his profits, his savings, his success in a  30  society, and things in general.

21. A. agree                 B. taste                 C. suit                  D. fit

22. A. series                 B. course              C. number            D. few

23. A. situations           B. surroundings      C. weather            D. life

24. A. stop                   B. hurt                 C. help                 D. prevent

25. A. eat                           B. prepare            C. avoid               D. try

26. A. highly               B. widely                    C. alternately        D. regularly

27. A. hardship            B. debts                C. worries            D. success

28. A. see                           B. notice               C. glance               D. consider

29. A. rich                   B. happy               C. normal                    D. successful

30. A. struggle                    B. business           C. miserable         D. competitive

单项选择题