CN106268259A - 一种烟气中SO2和Hg同步生化脱除的方法 - Google Patents
一种烟气中SO2和Hg同步生化脱除的方法 Download PDFInfo
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Abstract
本发明涉及一种烟气中SO2和Hg同步生化脱除的方法,属于工业烟气治理领域。本发明将烟气依次经除尘降温、硫酸盐还原菌处理、沉降打捞,使SO2和Hg被同时脱除并资源化回收。本发明采用生化法同步脱硫和Hg,可以有效降低传统以钙法和氨法烟气脱硫的成本,使操作更加简便,同时消除了二次污染;且反应过程简单,实现以废治废的同时,也实现了工业炉窑烟气中硫元素和Hg的协同去除和资源化回收。
Description
技术领域
本发明涉及一种烟气中SO2和Hg的同步生化脱除的方法,属于工业烟气治理领域。
背景技术
我国工业锅炉是除燃煤电厂之外的燃煤大户,在燃煤锅炉的烟气中,SO2和Hg是主要成分。煤中的硫、汞等氧化或升华后进入烟气,其中硫氮氧化燃烧形成二氧化硫、氮氧化物,汞挥发形成化合物及单质汞,对区域环境和人体健康构成严重威胁。目前烟气中氮氧化物处理相对成熟,但关于二氧化硫、汞的协同去除研究仍有较大空间。
如今燃煤工业锅炉烟气脱硫主要采用钙法脱硫和氨法脱硫,烟气中汞的排放,主要利用成熟的除尘、脱硫等技术进行协同减排控制。钙法脱硫的副产脱硫石膏,因含有重金属及游离氧化钙而适用范围受限,堆置填埋会对土壤环境和地下水环境造成潜在威胁。氨法脱硫的副产硫酸铵中累积有多种重金属,施用农田会对食品安全和土壤环境造成严重威胁。而我国硫资源相对贫缺,硫磺每年进口量过千万吨,从硫资源利用、环境保护及可持续发展的需要出发,我国的烟气脱硫应优先选用回收法。
对于烟气中的汞与二氧化硫的协同去除,目前国内外均做了大量的研究。吴忠标、瞿赞等利用臭氧与氧化促进剂的湿法联合工艺;宁平等采用硫化氨等对工业炉窑中二氧化硫和重金属的同步脱除,相关研究实现了烟气中硫汞硝的协同去除,但也存在药剂与能源消耗较大、工艺复杂等不足,尤其是硫资源不能够回收。
硫酸盐还原菌是指一类能够通过异化作用还原硫酸盐的细菌(sulfate reducingbacteria,SRB)的统称,其生长虽然缓慢,但有极强的生存能力且分布广泛。
利用硫酸盐还原菌将烟气中SO2转化为还原态硫;采用生化处理出水对烟气的淋洗,还原态硫与烟气中SO2、Hg反应生成单质硫、HgS,实现烟气中SO2和Hg的同步去除。
发明内容
本发明的目的在于改进现有的烟气脱硫方法,提供一种利用硫酸盐还原菌,同步脱除烟气中SO2和Hg,并回收有用资源的方法。
本发明通过以下技术方案实现:
一种烟气中SO2和Hg同步生化脱除的方法,按以下步骤进行:
(1)利用除尘器对烟气进行除尘,然后用换热器回收热量,使烟气温度降至120~165℃除尘器和换热器均为常规设备;
(2)降温后的烟气经水淋洗2~5s得淋洗液;
(3)淋洗液进入厌氧反应器,厌氧反应器中载有硫酸盐还原菌(SRB)和碳源(碳源用于为硫酸盐还原菌提供营养物质),SRB与淋洗液的体积比为5~20%,碳源与淋洗液体积比为20~45%,厌氧反应器温度维持在15~60℃,pH维持在3~9,淋洗液在反应器中水力停留时间(HRT)为6~10h,使COD/SO3 2-维持在1.2~6.4,与硫酸盐还原菌充分接触反应,淋洗液中亚硫酸根被转化为H2S、HS-、S2-,反应式如下:
反应完成后将淋洗液排出,为生化处理出水;
(4)生化处理出水含有还原态硫H2S、HS-、S2-及H+等,用生化处理出水代替步骤(2)中的水用于烟气淋洗,与SO2和Hg生成硫磺以及HgS沉淀,反应式如下:
淋洗液经平流沉淀池,硫磺浮在表面,通过打捞分离出来进行回收;HgS沉淀在底部,通过过滤分离出来,可以用作着色剂,例如颜料、火漆、防腐剂。
厌氧反应器可以有以下几种:厌氧活性污泥、厌氧流化床、厌氧滤池、升流式厌氧污泥层(UASB)、颗粒污泥膨胀床(EGSB)、厌氧生物转盘等。
硫酸盐还原菌可以有以下几种:脱硫弧菌属(Desulfovibrio)、脱硫肠状菌属(Desulfotomaculum)、脱硫单胞菌属(Desulfomonas)、脱硫叶菌属(Desulfobulbus)、脱硫菌属(Desulfobacter)、脱硫球菌属(Desulfococcus)、脱硫线菌属(Desulfonema)、脱硫八叠球菌属(Desulfosarcina)、脱硫杆菌属(Desulfobacterium)和脱硫单胞菌属(Desulfuromonas)等。
碳源为人工配制的培养基,或者利用农作物、食品、发酵、生物制药废水等。
本发明的优点和积极效果是:
1、本发明采用生化法同步脱除SO2和Hg,可以有效降低传统以钙法和氨法烟气脱硫的成本,使操作更加简便,同时消除了二次污染;
2、本发明反应过程简单,实现以废治废,治理烟气的同时实现硫及Hg的资源化回收;
3、可以用于电站锅炉、工业锅炉以及生活锅炉,应用广泛。
附图说明
图1为本发明流程示意图。
具体实施方式
下面结合实施例和附图,对本发明进一步说明,下述实施例是说明性的,不是限定性的,以下实施例不限定本发明的保护范围。
实施例1
如图1所示,某电厂发电锅炉烟气中含SO2:3500mg/m3,Hg:1.2mg/m3。
(1)利用除尘器对烟气进行除尘,然后用换热器回收热量,使烟气温度降至120℃;
(2)用生化处理出水淋洗烟气(首先用水淋洗启动反应)5s,SO2和Hg与生化处理出水中S2-和H+等发生反应生成HgS和硫磺,淋洗液中的亚硫酸根浓度=1850mg/L,汞去除效率稳定大于90%;HgS经平流沉淀池沉淀过滤分离,浮在水面的硫磺打捞起来,实现其资源化回收利用;
(3)将淋洗液通入到载有硫酸盐还原菌和碳源的厌氧反应器中,该反应器采用厌氧活性污泥,硫酸盐还原菌菌种是脱硫弧菌属的Desulfovibrio desulfuricans种,碳源为人工配制的培养基,包括0.015~0.3%g/mL的(NH4)2SO4,0.01~0.4%g/mL的KH2PO4,0.05%g/mL的MgSO4·7H2O,0.001%g/mL的Ca(NO3)2,0.001~4%g/mL的FeSO4·7H2O(用于提供亚铁离子)和0.5~1%g/mL的亚硫酸盐、连二硫酸盐或连四硫酸盐(用于提供还原态硫或单质硫),SRB与淋洗液的体积比为5%,碳源与淋洗液体积比为30%,反应器温度为60℃、pH=3、COD/SO3 2-=3.5,HRT=6h,淋洗液中亚硫酸根转化为H2S、HS-、S2-;反应完成后将淋洗液排出,为生化处理出水,循环用于步骤(2)烟气淋洗。
实施例2
如图1所示,某冶铁工厂的蒸汽锅炉烟气中含SO2:2500mg/m3,Hg:1.5mg/m3。
(1)利用除尘器对烟气进行除尘,然后用换热器回收热量,使烟气温度降至165℃;
(2)用生化处理出水淋洗烟气(首先用水淋洗启动反应)3s,SO2和Hg与生化处理出水中S2-和H+等发生反应生成HgS和硫磺,淋洗液中的亚硫酸根浓度=2000mg/L,汞去除效率稳定大于80%;HgS经平流沉淀池沉淀过滤分离,浮在水面的硫磺打捞起来,实现其资源化回收利用;
(3)将淋洗液通入到载有硫酸盐还原菌和碳源的厌氧反应器中,该反应器采用颗粒污泥膨胀床(EGSB)结构,硫酸盐还原菌菌种是脱硫菌属的Desulfobacter postgatei种,碳源为农作物废水,SRB与淋洗液的体积比为10%,碳源与淋洗液体积比为20%,反应器温度为15℃、pH=6.8、COD/SO3 2-=1.2,HRT=10h,淋洗液中亚硫酸根转化为H2S、HS-、S2-;反应完成后将淋洗液排出,为生化处理出水,循环用于步骤(2)烟气淋洗。
实施例3
如图1所示,某玻璃工厂的燃煤锅炉烟气中含SO2:2600mg/m3,Hg:1.7mg/m3。
(1)利用除尘器对烟气进行除尘,然后用换热器回收热量,使烟气温度降至145℃;
(2)用生化处理出水淋洗烟气(首先用水淋洗启动反应)2s,SO2和Hg与生化处理出水中S2-和H+等发生反应生成HgS和硫磺,淋洗液中的亚硫酸根浓度=2200mg/L,汞去除效率稳定大于85%;HgS经平流沉淀池沉淀过滤分离,浮在水面的硫磺打捞起来,实现其资源化回收利用;
(3)将淋洗液通入到载有硫酸盐还原菌和碳源的厌氧反应器中,该反应器采用升流式厌氧污泥层(UASB),硫酸盐还原菌菌种是脱硫杆菌属的Desulfobacterium indolicum种,碳源为发酵废水,SRB与淋洗液的体积比为20%,碳源与淋洗液体积比为45%,反应器温度为55℃、pH=9、COD/SO3 2-=6.4,HRT=7.5h,淋洗液中亚硫酸根转化为H2S、HS-、S2-;反应完成后将淋洗液排出,为生化处理出水,循环用于步骤(2)烟气淋洗。
Claims (10)
1.一种烟气中SO2和Hg同步生化脱除的方法,包括以下步骤:
(1)利用除尘器对烟气进行除尘,然后用换热器回收热量使烟气降温;
(2)降温后的烟气经水淋洗得淋洗液;
(3)淋洗液进入厌氧反应器,厌氧反应器中载有硫酸盐还原菌和碳源,淋洗液在厌氧反应器中与硫酸盐还原菌充分接触反应后排出,为生化处理出水;
(4)用生化处理出水代替步骤(2)中的水用于烟气淋洗,生化处理出水中所含还原态硫和H+与烟气中的SO2和Hg反应生成硫磺以及HgS沉淀,淋洗液经平流沉淀池,硫磺浮在表面,通过打捞分离出来进行回收,HgS沉淀在底部,通过过滤分离出来。
2.根据权利要求1所述的方法,其特征在于,步骤(1)使烟气温度降至120~165℃。
3.根据权利要求1所述的方法,其特征在于,步骤(2)淋洗时间为2~5s。
4.根据权利要求1所述的方法,其特征在于,步骤(3)中厌氧反应器为厌氧活性污泥、厌氧流化床、厌氧滤池、升流式厌氧污泥层、颗粒污泥膨胀床、厌氧生物转盘中的任意一种。
5.根据权利要求1所述的方法,其特征在于,步骤(3)中的硫酸盐还原菌为脱硫弧菌属、脱硫肠状菌属、脱硫单胞菌属、脱硫叶菌属、脱硫菌属、脱硫球菌属、脱硫线菌属、脱硫八叠球菌属、脱硫杆菌属、脱硫单胞菌属中的任意一种。
6.根据权利要求1所述的方法,其特征在于,步骤(3)中硫酸盐还原菌与淋洗液的体积比为5~20%。
7.根据权利要求1所述的方法,其特征在于,步骤(3)中的碳源为人工配制的培养基或者农作物、食品、发酵、生物制药废水。
8.根据权利要求1所述的方法,其特征在于,步骤(3)中碳源与淋洗液体积比为20~45%。
9.根据权利要求1所述的方法,其特征在于,步骤(3)中厌氧反应器温度为15~60℃,pH为3~9,COD/SO3 2-为1.2~6.4。
10.根据权利要求1所述的方法,其特征在于,步骤(3)中淋洗液在厌氧反应器中停留6~10h。
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