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【绿色发展 绿色生活】垃圾污水能变废为宝 山东日照探索绿色循环经济发展新模式
韩邦宁说,垃圾处理最基本的目标是不产生二次污染,而在日照市餐厨废弃物处理厂,不仅达到了这个目标,对厨余垃圾的循环利用也实现了环境效益与经济效益的统一。
在日照市第一生活垃圾焚烧发电厂,生活垃圾也充分发挥了自己的价值。这里每天能处理生活垃圾800吨左右,产生的电量能供约两万多个家庭使用。日照市第一生活垃圾焚烧发电厂总经理助理秦海金说,目前垃圾焚烧产生的飞灰、烟气等经过一系列先进环保工艺的处理,已经达到了减量化、无害化和资源化。秦海金说:“现在垃圾发电厂,最重要的一个危险点就是飞灰,因为它里面重金属超标,所以需要我们用螯合剂把飞灰里的重金属稳定化,化验合格后我们(把飞灰)进行填埋。活性炭就是用来在我们的尾部烟道里喷射,大家都知道活性炭有强吸附能力,它把尾部烟道残余的那些重金属包括二噁英吸附,吸附住以后用除尘器把它处理下来,形成飞灰的一部分。然后这个炉渣方面,大概25%的炉渣我们经过综合利用,制成标准水泥砖和道板砖,完全实现了综合利用。”
每天有大量的生活垃圾运到这里进行发酵
日照市在垃圾处理和利用方面已经探索出一条绿色发展的循环经济模式,在城市污水处理方面也达到了“零排放”,并且实现了一条绿色经济发展的产业链。日照市第二污水处理厂采用先进的污水处理工艺,日处理污水达到6万多吨,处理后的水主要用于日照钢铁厂循环冷却用水,城市园林绿化和河道补充水。厂长朱超介绍说:“因为进入到我们污水处理厂的水,很少一部分是工业水,大量的是我们的生活污水,处理完以后基本是供给企业,很少一部分外排,外排也是给湿地公园,因为现在河道里的水比较少,我们把一部分水补充到河道里,让下面的河道有一些景观用水。”
在污水处理的过程中会产生污泥,污泥容易腐化发臭造成空气污染,污泥中还含有一些有害物质极易对地下水和土壤产生二次污染。不过,污泥也是可以“变废为宝”的。日照市污泥生物处理厂是山东第一家污泥生物处理厂。目前日照市城区的几家污水处理厂产生的污泥全部都送到这里进行稳定化、减量化、无害化和资源化处理,既减少了对环境的危害,同时实现了可持续发展的绿色循环经济模式。
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