问题 问答题

第四题    危险废物综合利用

    某危险废物处理公司拟建设硫酸铜生产项目,年利用印刷线路板企业含铜蚀刻废液3.0×103t。项目以酸性蚀刻废液、碱性蚀刻废液、工业硫酸等为原料,生产硫酸铜。副产品为氯化铵。生产工艺见下图,年生产300d。

       

    经初步工程分析,蒸发浓缩工序日处理含15%氯化铵滤液100t,可得到含39.9%氯化铵浓缩液37.5t。蒸发浓缩产生的蒸气冷凝水经离子交换处理后排入A河,离子交换去除氯化铵的效率为97%。

    生产过程中使用的酸性蚀刻废液、碱性蚀刻废液、工业硫酸等原辅料分别以常压储罐(管道收发)方式存放在厂区原料仓库内,原料仓库为通间。

    项目位于A河沿岸,800m范围内没有居民点。河流为单向河流,河流顺直,水环境功能为Ⅲ类。

        (注:外排废水中氯化铵与氨氮的转化比为:氯化铵:氨氮=53.5:14,假定废水的密度为1.0×103kg/m3。《污水综合排放标准》中氨氮最高允许排放浓度一级标准为15mg/L,二级标准为25mg/L。)

        [问题]

分析外排废水氨氮的达标排放情况。

答案

参考答案:

(1)外排废水量:100-37.5=62.5t/d=62.5m3/d。 (2)根据第2小题的结果计算,排放废水中氯化铵的量为1.125kg=1.125×106mg。 (3)由于氯化铵与氨氮的转化率为:氯化铵:氨氮=53.5:14,则废水氨氮浓度=1.125×103÷62.5×(14/53.5)=4.71mg/L。 (4)项目所处A河水环境功能为Ⅲ类,废水中氨氮最高允许排放浓度执行一级标准15mg/L,故外排废水氨氮达标排放。

解答题
阅读理解

It was one of the hottest days of the dry season. We had not seen rain in almost a month. The crops were dying. Cows had stopped giving milk. The streams were long gone back into the earth. If we didn’t see some rain soon we would lose everything.

I was in the kitchen making lunch for my husband and his brothers when I saw my six-year old son, Billy, walking toward the woods. He was obviously walking with a great effort... trying to be as still as possible. Minutes after he disappeared into the woods, he came running out again, toward the house.

Moments later, however, he was once again walking in that slow purposeful long step toward the woods. This activity went on for over an hour: walking cautiously to the woods, then running back to the house. Finally, my curiosity got the best of me. I crept out of the house and followed him on his journey.

He was cupping both hands in front of him as he walked; being very careful not to spill(溅出) the water he held in them. Branches and thorns slapped his little face but he did not try to avoid them. He had a much greater purpose. As I leaned in to spy on him, I saw the most amazing site.

Several large deer appeared threatening in front of him. But Billy walked right up to them. I almost screamed for him to get away. And I saw a baby deer laying on the ground, obviously suffering from heavy loss of water and heat exhaustion, lift its head with great effort to lap(舔) up the water cupped in my beautiful boy’s hand.

I stood on the edge of the woods watching the most beautiful heart I have ever known working so hard to save a life. As the tears that rolled down my face began to hit the ground, they were suddenly joined by other drops... and more drops... and more. I looked up at the sky. It was as if God, Himself, was weeping with pride.

小题1:What can be learned from Paragraph 1?

A.The writer lived in the hottest place.

B.It wouldn’t rain during the dry season.

C.All the crops in the area were dead.

D.People were in great need of rain.小题2:Billy walked carefully to the woods because ______.

A.he was not old enough to walk freely

B.he didn’t want to be followed by his mother

C.he tried not to spill the water in his hands

D.he wanted to attract his mother’s attention小题3:Why did the writer almost scream for Billy to get away?

A.Because she saw the most amazing site in the woods

B.Because those large deer appeared dangerous

C.Because she saw a baby deer laying on the ground

D.Because the deer suffered from heavy loss of water小题4:After learning about the truth, the author felt _______.

A.curious and confused

B.scared and excited

C.moved and curious

D.proud and moved小题5:Which of the following is the best title for the passage?

A.The Water of Life

B.Importance of Water

C.How to Save Animals

D.Animals in Danger