问题 问答题 论述题

废水可生化性问题的实质是什么?

答案

参考答案:

评价废水可生化性的主要方法有哪几种?废水可生化性问题的实质是判断某种废水能否采用生化处理的可能性。

常用的评价方法有以下两种:

(1)参数法。常用BOD5/COD或BOD5/TOD的值来表示。一般认为当BOD5/COD﹥0.4时,此种废水的可生化性好;当BOD5/COD﹤0.2时,此种废水的可生化性较差。

(2)耗氧系数法,其它略

 

多项选择题
改错题
短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行作出判断:
     如有错误(每行只有一个错误),则按下列情况改正;
     此行多一个词:把多余的词用斜线(/)划掉,在该行右边横线上写出该词。并也用
斜线划掉。
     此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
     此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
     注意:原行没有错的不要改
Dear Mom,
    Mother's Day was coming. I'm sorry that I am abroad           
and can't send your flowers, so I'm writing to you.                
    Mom, I know I have never expressed my thank to you         
before. But on today, at this special time, I just want to tell          
you loudly: I love you, Mom! Thank you so much by not            
only giving me life, but also teach me how to be a good            
person. Thank you for all you had done for me. Mom, though       
I may often say it, I do love you. Nobody can take your          
part in my heart. Whenever I am, I will always love you.            
    Hope you good health and much happiness every day!        
                                  Your little girl,
                                   Jennifer
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