今天干了件politically incorrect的事 - 未名空间MITBBS历史存档

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今天干了件politically incorrect的事

今天干了件politically incorrect的事# Environmental - 环境科学与工程

l*u2008-03-25 07:03

1 楼

最近我们这儿水有些不对劲，我怀疑是氨。猜测可能因为什么原因，水厂氨和氯量提高
了。于是顺便担心DBP。给儿子买了两个星期的蒸馏水，还不见水质好转。今天问了公
司几个人，没人说得出来是怎么回事。
大妈我想到家里的小娃娃，实在担心，就跟当地的自来水公司发信问。刚发完，看见大
头儿过来，问之是否知道。人说，知道，一般春秋的时候，确实提高氨和氯量。我ft。
暗想是哪个缺德engineer的主意，于是问头儿。头儿大笑，说，70%的活儿都是我们干
的。我ffdt，那封给自来水公司的信立刻显得是个问题。赶紧forward给大头儿。大头
儿看后说，if you think this is the worst thing that you've ever done, you
will be doing pretty good。然后他说下次再去水厂时，带上我一起看看。sigh，得
罪到自家人身上了。

a*a2008-03-25 07:03

2 楼

Hi Littleokdu, I have to question your knowledge on DBPs. If free ammonia
residual is so high, the free chlorine residual in the water should be
pretty low. DBPs level is proportion to free chlorine level. The higher
the free chlorine, the higher DBP will be.

【在 l********u 的大作中提到】

: 最近我们这儿水有些不对劲，我怀疑是氨。猜测可能因为什么原因，水厂氨和氯量提高
: 了。于是顺便担心DBP。给儿子买了两个星期的蒸馏水，还不见水质好转。今天问了公
: 司几个人，没人说得出来是怎么回事。
: 大妈我想到家里的小娃娃，实在担心，就跟当地的自来水公司发信问。刚发完，看见大
: 头儿过来，问之是否知道。人说，知道，一般春秋的时候，确实提高氨和氯量。我ft。
: 暗想是哪个缺德engineer的主意，于是问头儿。头儿大笑，说，70%的活儿都是我们干
: 的。我ffdt，那封给自来水公司的信立刻显得是个问题。赶紧forward给大头儿。大头
: 儿看后说，if you think this is the worst thing that you've ever done, you
: will be doing pretty good。然后他说下次再去水厂时，带上我一起看看。sigh，得
: 罪到自家人身上了。

l*u2008-03-25 07:03

3 楼

What I was really concerned about was mixing when increased amounts of
chlorine and ammonia were added to the water. At a higher dosage, the
previously sufficient mixing might become insufficient, which could lead to
incomplete reaction of the two chemicals. As a result, ammonia goes up in
the water. An even more serious consequence would be an elevated level of
disinfection byproducts. Seeing that the reason they increase the dosage of
Cl2 is because of TOC, I have to be concerned about DBP.
Yo

【在 a*****a 的大作中提到】

: Hi Littleokdu, I have to question your knowledge on DBPs. If free ammonia
: residual is so high, the free chlorine residual in the water should be
: pretty low. DBPs level is proportion to free chlorine level. The higher
: the free chlorine, the higher DBP will be.

a*a2008-03-25 07:03

4 楼

Increasing chlorine dosages at water treatment plant is to achieve
disinfection CT time as required by stage 1 DBP/P rule. In another words,
any surface water treatment plants have to achieve 3-log removal on Giardia
and 4-log removal on Virus. In the winter season, the required disinfection
CT is much higher due to the lower water temperature. Therefore, the
chlorine dosge has to be increased for meeting it. TOC removal is not
related to disinfection process but enhanced coagulation proces

【在 l********u 的大作中提到】

: What I was really concerned about was mixing when increased amounts of
: chlorine and ammonia were added to the water. At a higher dosage, the
: previously sufficient mixing might become insufficient, which could lead to
: incomplete reaction of the two chemicals. As a result, ammonia goes up in
: the water. An even more serious consequence would be an elevated level of
: disinfection byproducts. Seeing that the reason they increase the dosage of
: Cl2 is because of TOC, I have to be concerned about DBP.
: Yo

l*u2008-03-25 07:03

5 楼

thanks. 觉得在网路上讨论技术很二，结果我自己又二了一回

,
Giardia
disinfection
the

【在 a*****a 的大作中提到】

: Increasing chlorine dosages at water treatment plant is to achieve
: disinfection CT time as required by stage 1 DBP/P rule. In another words,
: any surface water treatment plants have to achieve 3-log removal on Giardia
: and 4-log removal on Virus. In the winter season, the required disinfection
: CT is much higher due to the lower water temperature. Therefore, the
: chlorine dosge has to be increased for meeting it. TOC removal is not
: related to disinfection process but enhanced coagulation proces