CN107235709A - 一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法 - Google Patents
一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法 Download PDFInfo
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Abstract
本发明公开了一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其步骤:(1)将垃圾焚烧飞灰与污泥按照质量比为(0.17~4):1的比例混合,再向其中加入助熔剂,助熔剂用量为圾焚烧飞灰与污泥总量的2~10%,充分搅拌,得到含水率为18.58~51.31wt%的混合物;(2)将搅拌后混合物送入造粒机造粒,得到粒径为0.5~5cm的颗粒坯料;(3)将所得颗粒坯料放至于50~80℃温度下烘干24~36h;(4)将所得烘干坯料放在500~800℃温度下煅烧0.5~2h,冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化烧结料坯。该方法不仅能降低处理焚烧飞灰和污泥的能耗,而且能将焚烧飞灰和污泥中的重金属被固化在颗粒化坯料中,降低烧结重金属浸出浓度,为城市生活垃圾焚烧飞灰和污泥无害化处理提供新的途径。
Description
技术领域
本发明涉及一种生活垃圾焚烧飞灰与污泥混合低温颗粒化的方法。
背景技术
随着社会的发展和人民生活水平的提高,我国生活垃圾的产量以每年8%-10%的速度快速增长。垃圾处理的方式主要有卫生填埋、高温堆肥和焚烧等。其中,焚烧处理由于减量化效果好和资源利用率高等优势已成为垃圾处理的主流工艺之一。但是,生活垃圾焚烧后会产生相当于原垃圾质量3%-8%的焚烧飞灰,并且飞灰在经过烟道时其表面不但会富集高浓度的重金属,如Pb、Zn、Cd等,还会吸附焚烧过程中产生的剧毒、强致癌物质二噁英,危害极大,己被列入我国《国家危险废物名录》。
目前飞灰的处理处置方法主要有:水泥固化、沥青固化、熔融固化、化学药剂固化稳定化等。但是水泥固化和沥青固化使得处理物体积变大,不仅需要大量水泥和沥青,还需要更大的填埋空间;熔融固化效果较好,但是由于飞灰热值很低,处理能耗过大;化学药剂固化稳定需要大量投入资金,而且长期稳定性得不到保证,不能实现彻底的无害化。
随着国内污水处理事业的发展,污水厂总处理水量和处理程度将不断扩大和提高,产生的污泥量也日益增加。据估算,目前中国城市污水处理厂每年排放的污泥量(干重)大约为130万吨,而且年增长率大于10%。如果城市污水全部得到处理,则将产生污泥量(干重)为840万吨,占中国总固体废弃物的3.2%。污泥含水率高达80%以上,并且含有病原微生物、多种有机和无机污染物及重金属等,属于危险废物。
目前主要的污泥处置技术包括卫生填埋、农林利用、焚烧等。污泥卫生填埋占地广,耗时长,且易污染地下水。污泥的农林利用虽然能在一定程度上能减少农业生产成本,但是要求对污泥进行无害化预处理,过程复杂。污泥焚烧能最大程度对污泥进行减量无害化处理,但需要高昂的投资和运行成本,且焚烧易造成重金属随烟尘扩散造成二次污染。
发明内容
针对现有技术存在的缺陷,本发明的目的是提供一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,该方法不仅能进一步降低处理焚烧飞灰和污泥的能耗,而且能将烧飞灰和污泥中的重金属被固化在低温颗粒化料坯中,降低烧结重金属浸出浓度,为城市生活垃圾焚烧飞灰和污泥的无害化处理提供新的途径。
为了达到上述目的,本发明通过以下技术方案予以实现:
一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其步骤如下:
(1). 将垃圾焚烧飞灰与污泥按照质量比为(0.17~4) :1的比例进行混合,再向其中加入助熔剂,助熔剂用量为圾焚烧飞灰与污泥总量的2~10%,充分搅拌,得到含水率为18.58~51.31wt%;
(2). 将步骤(1)搅拌后的混合物送入造粒机进行造粒,得到粒径为0.5~5cm的颗粒坯料;
(3). 将步骤(2)所得颗粒坯料放置于50~80℃温度下烘干24~36h;
(4). 将步骤(3)所得烘干坯料放在500~800℃温度下煅烧0.5~2h,自然冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化料坯。
所述的垃圾焚烧飞灰是指生活垃圾焚烧处理后的残余物;所述的污泥是指城市生活污水、工业废水处理过程中产生的固体废弃物、河流湖泊水库等疏浚底泥中的一种或多种。
所述的助熔剂是指硼酸、氧化铁、氟化钙、氧化硅等材料的一种或几种。
与现有技术相比,本发明的有益效果是:通过垃圾焚烧飞灰与污泥混合,不仅能使微生物破壁脱水,提高污泥脱水性能,而且由于污泥的添加使混合物更容易成型造粒;污泥中含有磷,垃圾焚烧飞灰与污泥共烧结过程中能够生成稳定的含磷混合物,减少重金属的挥发;同时,在混合物中添加助熔剂,降低混合物的烧结温度,使得混合物能在较低温度条件下垃圾焚烧炉内完成烧结,降低混合物处理的能耗;垃圾焚烧飞灰和污泥中的重金属被固化在烧结料坯中,降低重金属浸出浓度,为城市生活垃圾焚烧飞灰以及污泥无害化处理提供了一种新途径。
具体实施方式
下面对本发明的具体实施例作进一步详细说明。
实施例 1
本实施例一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其具体过程和步骤如下:
(1). 将80kg飞灰、20kg污泥和2kg氟化钙混合,充分搅拌,得含水率为32.16%的混合物,所述的焚烧飞灰和污泥来源于上海市某生活垃圾焚烧厂;
(2). 将步骤(1)搅拌后的混合物送入造粒机进行造粒,得到粒径为0.5cm的颗粒坯料;
(3). 将步骤(2)所得的颗粒坯料放置于50℃下烘干24h;
(4). 将步骤(3)所得的烘干坯料放在800℃温度下煅烧0.5h,自然冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化料坯。
本实施例1制得的焚烧飞灰与污泥混合低温颗粒化料坯为灰色,对其进行TCLP毒性浸出测试,其结果见表1。
由表1看出,本发明制得的混合低温颗粒化料坯中重金属浸出浓度低,稳定性好。
实施例 2
本实施例一种垃圾焚烧飞灰与污泥混合共处理低温颗粒化的方法过程和步骤如下:
(1). 将56kg焚烧飞灰、44kg污泥和4kg氟化钙混合,充分搅拌,得含水率为32.16%的混合物,所述的焚烧飞灰和污泥来源于上海市某生活垃圾焚烧厂;
(2). 将步骤(1)所得的的混合物送入造粒机进行造粒,得到粒径为1cm的颗粒坯料;
(3). 将步骤(2)所得的颗粒坯料放置于60℃下烘干24h;
(4). 将步骤(3)所得的烘干坯料放在500℃温度下煅烧2h,自然冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化料坯。
本实施例制得的焚烧飞灰与污泥混合低温颗粒化料坯为灰色,对其进行TCLP毒性浸出测试,其结果见表2。
由表2看出,本发明制得的混合低温颗粒化料坯中重金属浸出浓度低,稳定性好。
实施例 3
本实施例3一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法过程和步骤如下:
(1). 将12kg焚烧飞灰、70kg污泥和8kg硼酸混合,充分搅拌,得含水率为51.31%的混合物,所述的焚烧飞灰和污泥来源于上海市某生活垃圾焚烧厂;
(2). 将步骤(1)所得的的混合物送入造粒机造粒,得到粒径为5cm的颗粒坯料;
(3). 将步骤(2)所得的颗粒坯料放置于80℃温度下烘36h;
(4). 将步骤(3)所得的烘干坯料置于800℃温度下煅烧2h,自然冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化料坯。
本实施例制得的焚烧飞灰与污泥混合低温颗粒化料坯为灰色,对其进行TCLP毒性浸出测试,其结果见表3。
由表3看出,本发明制得的混合低温颗粒化料坯中重金属浸出浓度低,稳定性好。
对上述实施例1至3中所述的低温混合颗粒化料坯的TCLP毒性浸出测试步骤如下::
(1). 按照EPA的TCLP毒性浸出试验法配制浸提溶液,将 5.7 mL醋酸用蒸馏水定容至1 L,提取液的 pH 为 2.88±0.05。
(2). 将本发明的混合低温颗粒化料坯磨碎后,用上述浸提剂进行浸取,保持液固比为20:1,即1g样品用20mL浸提剂,在常温下于 TCLP 浸出试样制备仪中浸出 18±2 h,上下颠倒速率为 30 r/min。
(3). 浸提结束后将样品进行离心固液分离,上层液过膜后利用ICP测定重金属浸出浓度。
本发明垃圾焚烧飞灰和污泥混合低温颗粒化料坯,实现两种危险废物的同步减量化、无害化处理和资源化利用,具有流程简单、投资少、运行费用低等优点。
Claims (3)
1.一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其特征在于,该方法具体步骤如下:
(1)将垃圾焚烧飞灰与污泥按照质量比为 (0.17~4):1的比例进行混合,再向其中加入助熔剂,助熔剂用量为圾焚烧飞灰与污泥总量的2~10%,充分搅拌,得到含水率为18.58~51.31wt%;
(2)将步骤(1)搅拌后的混合物送入造粒机进行造粒,得到粒径为0.5~5cm的颗粒坯料;
(3)将步骤(2)所得颗粒坯料放置于50~80℃温度下烘干24~36h;
(4)将步骤(3)所得烘干坯料放在500~800℃温度下煅烧0.5~2h,自然冷却至室温,制得焚烧飞灰与污泥混合低温颗粒化料坯。
2.根据权利要求l所述一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其特征在于步骤(1)中所述的垃圾焚烧飞灰是指垃圾焚烧处理后的残余物;所述的污泥是指城市生活污水、工业废水处理过程中产生的固体废弃物、河流湖泊水库等疏浚底泥中的一种或多种。
3.根据权利要求l所述一种垃圾焚烧飞灰与污泥混合低温颗粒化的方法,其特征在于步骤(1)中所述的助熔剂是指硼酸、氧化铁、氟化钙、氧化硅材料的一种或几种。
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