CN111847703A - 一种工业脱硫废水的处理工艺 - Google Patents
一种工业脱硫废水的处理工艺 Download PDFInfo
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- 230000002195 synergetic effect Effects 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
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Abstract
本发明公开了一种工业脱硫废水的处理工艺,包括将工业脱硫废水初过滤后中和、还原、沉淀、曝气、絮凝、杀菌、过滤等步骤,通过多次沉淀、絮凝过后将脱硫废水净化,相较于传统的脱硫废水处理工艺,通过本发明处理后的脱硫废水净化率更高,且步骤简单,对环境友好,实现了工业脱硫废水的零排放,具有较高的商业价值。
Description
技术领域
本发明涉及工业污水净化处理领域,尤其涉及一种净化处理工业脱硫产生废水的处理工艺。
背景技术
随着科技的不断发展,工业的进程也不断加快,作为目前电力的一大来源,大型燃煤电厂也不断的兴建,随之而来带来的是燃料的不断使用,同时在电厂燃煤的过程中释放的二氧化硫给环境带来了极大的污染,脱硫废水主要是锅炉烟气湿法脱硫(石灰石/石膏法)过程中吸收塔的排放水,若直接排放到外界,给环境带来的影响不言而喻。
目前脱硫废水的处理工艺主要包括水力处理、蒸发浓缩结晶、常规处理回用干灰调湿(农场喷洒)、煤场喷洒以及经处理后外排的方法,但在农场、煤场喷洒具有较多的问题,如腐蚀问题,因为脱硫废水具有酸性,对于金属设备的损害较大,而水力处理等方法需要进行二次处理,难以实现真正的零排。
目前的处理手段中,一般来说将工业脱硫废水经过中和、过滤、软化等步骤多重处理后,再排出,但处理的成本较高,且效果一般。
发明内容
本发明的目的在于提供一种成本较低,净化脱硫废水效果较好的工业废水处理工艺,该工艺能够实现废水零排,对环境友好。
为了达到上述目的,本发明提供了一种工业脱硫废水的处理工艺,包含以下步骤:
(1)中和:将需处理的工业脱硫废水加入至中和沉淀池中,加入若干的石灰乳,使池内pH达到10以上并辅以不断搅拌;此时石灰乳能够有效地与脱硫废水中的氟化物反应生成CaF2沉淀与其他部分重金属形成沉淀;
(2)还原、沉淀:将上述经中和处理后的工业脱硫废水继续加入有机硫化物以及还原剂,继续搅拌后静置2-3小时;
(3)曝气:调节步骤(2)处理后所得工业脱硫废水的pH值至10以上,并向废水中中曝气1小时,之后静置1小时;
(4)絮凝:将步骤(3)中所得工业脱硫废水再次过滤后引入絮凝池中,加入絮凝剂,待絮状物沉淀后进行下一步处理;
(5)杀菌、超滤:回收步骤(3)中絮凝后工业脱硫污水的上清液,加入杀菌剂,并加入少量的酸将溶液pH值调回6-8,超滤后即处理完毕。
作为优选的步骤,所述步骤(1)中,中和池上部设有3个过滤槽,且过滤槽的孔径从上到下依次减小,工业脱硫废水经过滤槽后流入中和池,工业脱硫废水在流经中和沉淀池前线先经过初步过滤,以除去部分残渣。
作为优选的步骤,所述步骤(1)中,以质量分数计,所述石灰乳的加入量为工业脱硫废水的5%-10%,在加入量为5-10%时,石灰乳的中和效果最好,在中和脱硫废水pH值的同时且能更好的净化,并且能有效地去除废水中的氟化物及部分重金属离子。
作为优选的步骤,所述步骤(1)与所述步骤(2)中,搅拌的速度均为50-100转每分钟,搅拌的时间为20-50分钟。
作为优选的步骤,所述步骤(2)中,所述有机硫化物为三巯基均三嗪三钠盐,所述的还原剂为连二亚硫酸钠,有机硫化物的加入能够与多种重金属(汞、铅、铬等)离子螯合形成难溶于水的有机硫化合物,进一步去除重金属离子;还原剂能够有效地促进沉淀的形成,选用连二亚硫酸钠与三巯基均三嗪三钠盐二者组合,协同作用使沉淀更快的生成。
作为优选的步骤,所述步骤(3)中还包括将所得沉淀经干燥、高温煅烧后溶解得到再生石灰乳,重新加入步骤(1)中循环使用,作为再生石灰乳多次利用,也符合用废除废的方针,也能够节省成本。
作为优选的步骤,所述步骤(4)中,采用的絮凝剂为复合硫酸氯化铁、聚丙烯酰胺以及水的混合物,混合比例为42:3:55,采用复合硫酸氯化铁、聚丙烯酰胺以及水的混合物作为混凝剂能够加快脱硫废水中胶体颗粒以及微小悬浮物的聚集,高效净化脱硫废水。
作为优选的步骤,所述步骤(5)中,超滤参数具体为:运行压力0.5Mpa,透过通量为200LMH。
该技术方案具有以下有益的技术效果:
本发明通过多次沉淀、过滤来降解脱硫废水中的重金属离子,采用多个反应池,并重复利用石灰乳,在中和脱硫废水的同事沉淀重金属离子,多次沉淀、絮凝后将污水超滤即排出,净化废水的工艺较为简单,且效果优秀,使用的设备也较少,处理后的废水满足国家污水综合排放的标准,实现了脱硫废水的零排放。
具体实施方案
以下结合具体实施例,对本发明做进一步描述。
以下所提供的实施例并非用以限制本发明所涵盖的范围,所描述的步骤也不是用以限制其执行顺序。本领域技术人员结合现有公知常识对本发明做显而易见的改进,亦落入本发明要求的保护范围之内。
实施例一
脱硫废水的中和(预处理):将工业脱硫废水引入至过滤槽中,进行初步过滤,废水流经过滤孔径依次减小的三个过滤槽后,进行了初步过滤,流入中和沉淀池中;
将质量配比为工业脱硫废水5-10%的石灰乳导入至中和沉淀池中,并不断搅拌中和沉淀池内的工业脱硫废水,使工业脱硫废水与石灰乳完全融合,融合后池内pH即达到10以上。
实施例二
脱硫废水的还原、沉淀:石灰乳与脱硫废水融合后,形成了部分沉淀,向与石灰乳融合后的工业脱硫废水中加入还原剂连二亚硫酸钠与有机硫化物三巯基均三嗪三钠盐(TMT-15),三巯基均三嗪三钠盐能够有效地与废水中的各种重金属离子(汞、铅、铜、镉、镍、锰、锌、铬等)迅速反应,生成不溶于水,且具有良好的化学稳定性的螯合物,从而达到捕捉去除重金属的目的,而还原剂连二亚硫酸钠能够加快有机硫化物与重金属离子的结合,尽快生成沉淀,加快反应速度,并辅助以搅拌,搅拌速度为50-100转每分钟,搅拌的时间为20-50分钟,搅拌完毕后静置,待完全沉淀。
实施例三
脱硫废水的曝气:向上述还原、沉淀完毕后的脱硫废水中加入石灰乳以调节pH至10以上,并使用曝气装置对脱硫废水进行曝气,以将脱硫废水中的亚硫酸根离子氧化为硫酸根离子,并分解污水中的部分有机物,曝气完毕后继续静置脱硫废水1小时以上,收集容器中的沉淀,经干燥、高温煅烧后加入溶液制得再生石灰乳,可重新加入实施例一中的反应。
实施例四
脱硫废水的絮凝:将上述反应后的脱硫废水再次进行过滤后引入至絮凝池中,加入质量配比为42:3:55复合硫酸氯化铁、聚丙烯酰胺以及水的混合物(絮凝剂),进行溶液絮凝,絮凝沉降能够将脱硫废水中残余的悬浮物变大或形成絮团,从而沉降,再次形成沉淀。
实施例五
脱硫废水的杀菌、超滤:回收上述絮凝完毕后脱硫污水的上清液,将下部沉淀、污泥等废渣处理,在上清液内加入杀菌剂进行杀菌,并加入盐酸/硫酸等无机酸中和杀菌后的溶液,检测溶液的pH值为6-8,处理完毕后对溶液进行超滤,超滤的具体参数为运行压力0.5Mpa,透过通量为200LMH,超滤完毕后即得净化后的脱硫污水。
对实施例五超滤过后的水体以及未经处理的工业脱硫污水进行了相关参数的检测,获得的结果如下:
通过对比净化前后的工业脱硫废水的水质参数,可以看出通过本发明所采用的工业脱硫废水处理工艺对脱硫废水的净化效果极佳,且本发明采用的工艺流程较为简单,通过多次沉淀、絮凝过后将脱硫废水净化,相较于传统手段也更为环保,对环境友好,实现了脱硫废水的零排放。
以上对本发明的具体实施例进行了描述。需理解的是,本发明并不局限于上述特定实施方式,本领域技术人员可以在权利要求的范围内做出各种变性或修改,这并不影响本发明的实质内容。
Claims (8)
1.一种工业脱硫废水的处理工艺,其特征在于,包含以下步骤:
(1)中和:将需处理的工业脱硫废水加至中和沉淀池中,加入若干的石灰乳,使池内pH达到10以上并不断搅拌;
(2)还原、沉淀:在上述经中和处理后的工业脱硫废水继续加入有机硫化物以及还原剂,继续搅拌后静置2-3小时;
(3)曝气:调节步骤(2)处理后所得工业脱硫废水的pH值至10以上,并在废水中曝气60min,静置1小时;
(4)絮凝:将步骤(3)中所得工业脱硫废水再次过滤后引入絮凝池中,加入絮凝剂,待絮状物沉淀后进行下一步处理;
(5)杀菌、超滤:回收步骤(4)中絮凝后工业脱硫污水的上清液,加入杀菌剂,并加入少量的酸将溶液pH值调回6-8,最后超滤后即处理完毕。
2.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(1)中,中和沉淀池上部设有3个过滤槽,且过滤槽的孔径从上到下依次减小,工业脱硫废水经过滤槽后流入中和沉淀池。
3.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(1)中,以质量分数计,所述石灰乳的加入量为工业脱硫废水的5%-10%。
4.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(1)与所述步骤(2)中,搅拌的速度均为50-100转每分钟,搅拌的时间为20-50分钟。
5.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(2)中,所述有机硫化物为三巯基均三嗪三钠盐,所述的还原剂为连二亚硫酸钠。
6.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(3)中还包括将所得沉淀经干燥、高温煅烧后溶解得到再生石灰乳,重新加入步骤(1)中循环使用。
7.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(4)中,采用的絮凝剂为复合硫酸氯化铁、聚丙烯酰胺以及水的混合物,混合比例为42:3:55。
8.根据权利要求1所述的一种工业脱硫废水的处理工艺,其特征在于,所述步骤(5)中,超滤参数具体为:运行压力0.5Mpa,透过通量为200LMH。
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