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决不让一滴工业污水流入长江

2017-08-22 08:16:41   中国青年网

把污水截留在了厂区内,一场有惊无险的环境污染事故,被成功化解。不过,在长寿经开区安监局副局长兰鹰看来,即便当年福安制药的污水流出了厂区,它也逃不出他们的“掌心”,“很难流入当地河流,更不要说流入长江。”他说。

被“闲置”的防控设施

兰鹰的底气,来自于企业生产厂区外的另外三级防控体系。

据介绍,和工厂厂区内部的雨水管网一样,整个化工园区的公共雨水管网,构成了第三级防控体系。后者在紧急时刻会通过切换闸阀,将污水自动导流进入园区内的4个应急污水池——它们的总容量高达60万立方米,远超目前园区化工企业污水应急处理需求,这些污水池分布于园区化工企业的几大主要聚集地,能以最短距离和最高效率收集事故废水。

流经长寿经开区的晏家河,在两处不同河段被拦腰截断,闸出两道大坝,由此构建了第四和第五级防控体系。

这两级体系是如何防控污水的?在第五级防控大坝,记者见证了这一过程。警笛响起后,大坝的闸阀落下,水流被截断,坝内水位逐渐抬高,一个天然的蓄洪池逐渐形成。大坝的旁边有一个硕大的水池,工作人员介绍,水池既可以分洪,又可以对污水进行初级处理。

污水流经河道,却不会污染两岸的土壤。记者现场看到,第四级防控大坝以上河段,河底和护坡全部被硬化。

难逃“掌心”的污水,最终会来到位于长江边的污水处理厂。记者通过对比观察发现,历时约50个小时、经过10多道工序处理后的污水,与自来水在色泽和气味上并无太大差异。据介绍,企业正常生产的污水通过专门管网与污水厂连接,一旦发生事故,污水在5级防控体系中的各个应急污水池存集,初步处理后,再送往污水厂进行专业处理。

硬化防渗漏的河道、护坡,改造雨水管网,修建大坝和污水池,兰鹰透露,几年下来,长寿经开区在5级防控体系上累计投入了3亿多元,还不包括企业自己的投入,而真正发生的污水事故,仅有福安制药一例。“看起来是设施设备闲置,但我们宁愿让它们一直闲置下去。”兰鹰说。

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