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【简答题】
垃圾焚烧发电产生的烟气中含烟尘、二氧化硫、氮氧化物、氯化氢等有害物质，某处理流程如下： （1）麻石洗涤塔中设置多层格栅，上面放置大量耐酸碱塑料小球，塔内设置多层上喷下淋水嘴，“烟气”从塔底进入，目的是_____________________________________________。 （2）若NO 2 和NO气体以物质的量之比1∶1混合通入石灰水中，发生氧化还原反应生成一种正盐和水，请写出该反应的化学方程式：_________________________________________； 已知此正盐的水溶液呈碱性，用离子方程式表示：__________________________________。 （3）废液在沉淀池中慢慢沉降，沉淀主要含________；在回收再生池中加入NaOH固体的作用是___________________________________________。 （4）环境检测部门测量处理前后烟气中烟尘的含量见下表： 项 目 监测结果 国标号 处理前 处理后 GWKB3－2000 烟尘（mg·m －3 ） 13 929.0 61.0 80 简述其获得监测结果中的数据使用的测定方法：__________________________________。
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