问题 问答题

铅酸蓄电池厂改扩建

某铅酸蓄电池企业拟对现有两条生产能力均为25万千伏安时/年的生产线(生产工艺流程见下图)实施改扩建工程。

现有工程生产工艺废水经混凝沉淀述标后排入城市污水处理厂,地面冲洗水、职工浴室和洗衣房排水等直接排入城市污水处理厂。采用“旋风+水喷淋”或布袋除尘处理含铅废气,采用碱液喷淋洗涤处理硫酸雾。制板栅工段的铅污染物排放浓度监测结果见下表。

现有工程生产线制板栅工段含铅废气监测结果
工段风量/(m3/h)初始浓度/(mg/m3)排放浓度/(mg/m3)排气筒
制板栅4.0×1044.260.34H=15m

改扩建方案为:保留一条生产线。拆除另一条生产线中的熔铅、制粉、制铅膏、制板栅、涂板、化成、切片等前段工序,将其配组总装工序生产能力扩大为50万千伏安时/年。

注:《大气污染物综合排放标准》(GB 16297—1996)铅排放浓度限值0.70mg/m3,排气筒高15m时排放速率限值0.004kg/h;《工业炉窑大气污染物排放标准》(GB 9078—1996)铅排放浓度限值0.10mg/m3

[问题]

分析现有工程存在的主要环境保护问题。

答案

参考答案:

根据题中所给项目相关信息,现有工程存在的主要环境保护问题有:

(1)废水。现有工程生产工艺废水经混凝沉淀处理达标后排入城市污水处理厂不合适。现有工程生产工艺在不同工段产生的废水均含铅,属《污水综合排放标准》中第一类污染物,仅混凝沉淀难以使重金属铅达标,而应在车间单独预处理达标后,才能和其他废水合并处理达标后排放。

(2)废气。现有工程生产线制板栅工段含铅废气处理不达标,其废气排放速率经计算为:0.34×10-6×4.0×104=0.0136kg/h,大于0.004kg/h(标准限值)。

(3)地面冲洗废水、职工浴室和洗衣房排水,直接排入城市污水处理厂不可行。地面冲洗水、职工浴室和洗衣房的废水中含有重金属铅,应该单独处理排放。

(4)采用“旋风+水喷淋”除尘不可行。理由是处理效率低,不能保证铅的排放达标。

阅读理解

D

I wrote to the White House asking about a birthday greeting for my grandfather who will be 95 next year. I received a card signed by Bill and Hillary. They look like real signatures(签名)and are not printed and they are probably produced by autographing(亲笔签名)machines. That says:

Happy Birthday!

Hillary and I are delighted to join your friends and family in congratulating you on this special day. As you look forward to the year ahead, please accept our best wishes for good health and much future happiness.

This was sent in a double envelope so that I could address the inner one to my grandfather and send the sealed(盖章) card to him. The card has the presidential seal printed in gold. The outer envelop is hand addressed. 

NOTE: the postage meter impression on the outer envelope reminded me that the president does not have franking privileges.(邮资特权)

The outer envelope does have a little "B" written on the upper right corner indication that they have a pile of these pre-signed and double-enveloped; when a request comes in, they just write the address on the outer envelope and mail it. 

The return address on both envelopes is simple: The White House, Washington.

73.When did the writer write to the White House?

A.On his grandfather’s birthday.

B.On his birthday.

C.When his grandfather was 94 years.

D.When his grandfather was 95 years old.

74.It’s clear that the card sent by Bill and Hillary was                     .

A.signed by an autographing machine

B.the one that had real signatures of Bill and Hillary

C.the one whose signatures were printed

D.the one that was signed with their own names

75.Form what the card says, we can find it                        .

A.was a public letter for those who were in need of greeting

B.can be sent to all those who write to them both

C.was sent specially to the writer’s grandfather

D.can be sent to anyone whose birthday is coming near

76.The letter “B” on the upper right corner of the outer envelope means              .

A.these are all double envelope having cards with pre-signatures inside them

B.these are all letters which have franking privileges

C.they have written the address on the outer envelopes

D.they have written “The White House, Washington” on both envelopes

单项选择题