CN111547954B - 一种煤化工废水处理系统 - Google Patents

一种煤化工废水处理系统 Download PDF

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CN111547954B
CN111547954B CN202010444749.0A CN202010444749A CN111547954B CN 111547954 B CN111547954 B CN 111547954B CN 202010444749 A CN202010444749 A CN 202010444749A CN 111547954 B CN111547954 B CN 111547954B
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苏华
汤亚勇
季丹萍
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Wenshui County Xinmingtai Chemical Co.,Ltd.
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Abstract

本发明公开了一种煤化工废水处理系统,该系统在蒸氨塔中加入石灰,将固定氨蒸馏和游离氨蒸馏置于同一设备中,并在蒸氨塔后设置微波‑电催化塔针对有机氨类物质进行处理,降低后续处理过程中的处理负荷,并从根本上降低出水氨浓度,沉淀反应池排出泥渣中还有过量氢氧化钙,其与所述生物吸附池中的剩余污泥混合后,提高了剩余污泥的脱水性能,将脱水污泥经干馏处理制备污泥炭,并将污泥炭输送至蒸氨塔和反应沉淀池中,提高蒸氨塔及反应沉淀池的沉降性能以及污染物的去除效率。

Description

一种煤化工废水处理系统
技术领域
本发明属于水处理领域,具体涉及一种煤化工废水处理系统。
背景技术
煤化工废水是属有毒有害、难降解的高浓度有机废水,其中有机物以酚类化合物居多,还包括含氮、氧、碳的杂环化合物等。其中,焦化废水、煤气洗涤水是其中重要的种类,国内外对煤化工废水中酚、氰等有毒物质的处理,普遍采用生物活性污泥法,但对其中的NH3-N、氟化物、COD去除效果较差,难以满足外排的要求,尤其是在采用曝气池处理后的出水水质COD为50-100mg/L,但NH3-N高达500-800mg/L,若要排放,还得采用其他水源稀释后才能外排,在水资源日益吃紧的情况下,这种处理方式显然不能满足处理需求。
目前针对高氨氮废水的处理都会经过蒸氨塔处理,将废水中的大部分氨氮脱除,而排水中还存在高浓度的氨氮的现象不能根本解决,经研究发现,废水中还还有较高浓度的有机氮,在其进行活性污泥法处理时,经生物转化生产氨氮,对处理设备、处理环境造成了较大影响,因此,如何在现有技术的基础上,有效降低出水氨氮是目前急需解决的问题。
发明内容
本发明的目的是提供一种煤化工废水处理系统。
本发明的目的采用如下技术方案实现:
本发明公开了一种煤化工废水处理系统,包括:蒸氨塔1、微波-电催化塔2、沉淀反应池3、生物吸附池4、超滤处理装置5、厌氧池6、好氧池7、 MBR8、多介质过滤装置9、管路混合器10,所述蒸氨塔1上设置石灰入口11、焦化废水入口12、蒸氨废水输送管1-2-2和底泥输送管1-3-1,所述蒸氨废水输送管1-2-2连通所述微波-电催化塔2,所述微波-电催化塔2底部设置脱氮废水输送管2-3-1,所述脱氮废水输送管2-3-1连通所述沉淀反应池3,所述底泥输送管1-3-1连通所述沉淀反应池3,所述沉淀反应池3上清液输送至所述生物吸附池4,所述生物吸附池4连通所述超滤处理装置5,所述超滤处理装置5的浓水口通过浓液输出管5-6连通所述厌氧池6,所述超滤处理装置5的淡水口通过滤出液回流管5-10-3输送至所述管路混合器10,所述管路混合器10上设置煤气洗涤水进水管101,所述管路混合器10上设置混合液管将混合后的废水输送至所述沉淀反应池3中,所述厌氧池6连接所述好氧池7,好氧池7连通所述MBR8,所述MBR8连通所述多介质过滤装置 9,经多介质过滤装置9处理后的水经过出水管9-1排出。
进一步地,所述MBR8产生的污泥通过污泥回流管8-6回流至厌氧池6;
进一步地,所述MBR8产生的污泥通过吸附池入泥管8-4回流至所述生物吸附池4;
进一步地,所述焦化废水经过格栅、隔油处理;
进一步地,所述蒸氨塔中加入石灰进行蒸氨处理;
进一步地,所述微波-电催化塔中进行电催化氧化,降解有机氮,将有机氮降解,电催化过程中产生的活性自由基对含氮有机物进行氧化降解,配合微波作用,有机氮转化为氮气;
进一步地,所述微波-电催化塔中从上到下依次设置电催化筛板,所述电催化筛板上设置催化剂;
进一步地,所述微波-电催化塔中设置微波水处理装置,所述电催化筛板内设置电极;
进一步地,所述催化剂为TiO2-Ce-金刚石薄膜催化剂,负载在活性炭/ 沸石上;
进一步地,所述电催化筛板为中空结构,将所述催化剂设置在所述中空结构中;
进一步地,所述微波水处理装置为脉冲微波水处理装置;
进一步地,所述沉淀反应池3排出泥渣与所述生物吸附池4中的剩余污泥混合后进行脱水处理得到脱水污泥;
进一步地,脱水污泥经干馏处理制备污泥炭,并将污泥炭输送至蒸氨塔和反应沉淀池中。
本发明的煤化工废水处理系统,至少具有以下优点:
1.蒸氨塔中加入石灰,将固定氨蒸馏和游离氨蒸馏置于同一设备中;
2.蒸氨塔后设置微波-电催化塔针对有机氨类物质进行处理,降低后续处理过程中的处理负荷,并从根本上降低出水氨浓度;
3.将煤气洗涤水与超滤浓水混合,并通入沉淀反应池进行处理,利用浓水中的钙离子以及蒸氨塔底泥中的钙降低废水中氟离子浓度;
4.设置生物吸附池,进一步处理微波-电催化处理后的难降解有机物,充分降低后续工艺污水处理负荷;
5.沉淀反应池排出泥渣中还有过量氢氧化钙,其与所述生物吸附池中的剩余污泥混合后,提高了剩余污泥的脱水性能,将脱水污泥经干馏处理制备污泥炭,并将污泥炭输送至蒸氨塔和反应沉淀池中,提高蒸氨塔及反应沉淀池的沉降性能以及污染物的去除效率;
6.脱水污泥经干馏处理制备的污泥炭中含有氢氧化钙,并将污泥炭输送至蒸氨塔中,在活性炭巨大比表面积的作用下,蒸氨效率显著提高,缩短了处理时间;
7.煤气洗涤水与焦化废水混合使用,煤气洗涤水中的过量氟离子首先经过过量的钙离子去除,同时煤气洗涤水中的有机质、磷可以为后续生物吸附池提供营养物质,充分吸收焦化废水中的难降解有机物。
附图说明
图1煤化工废水处理系统示意图;
具体实施方式
下面通过实施例对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。
应当理解,本文所使用的诸如“具有”,“包含”以及“包括”术语并不排除一个或多个其它元件或其组合的存在或添加。
实施例1
某煤化工工厂中的焦化废水、煤气洗涤水
(1)经预处理的焦化废水进入蒸氨塔中,并向蒸氨塔内加入石灰,通过石灰控制蒸氨塔内pH为9.8-11.2;
(2)经蒸氨塔处理后的焦化废水输送至微波-电催化塔进行电催化氧化,所述催化剂为TiO2-Ce-金刚石薄膜催化剂,负载在活性炭/沸石上,所述微波 -电催化塔侧壁上设置阴极板,所述阴极板采用石墨板、钛板及不锈钢板混合设置;所述稳压直流电源输出电流为2000-6000A,所述微波-电催化塔中设置电催化筛板,所述电催化筛板内设置阳电极,所述微波水处理装置为脉冲微波水处理装置,废水处理过程中的微波功率为400-2000W,微波时间为 20-50min,电催化时间2-5h;降解有机氮,将有机氮降解,电催化过程中产生的活性自由基对含氮有机物进行氧化降解,配合微波作用,有机氮转化为氮气;
(3)将微波-电催化处理后的焦化废水输送至沉淀反应池3,同时煤气洗涤水及蒸氨塔底部残渣输送至沉淀反应池中进行混合反应,煤气洗涤水中的氟离子与过量的钙离子发生反应沉淀;
(4)沉淀反应池中产水输送至生物吸附池4中,生物吸附池中进行活性污泥的吸附处理,出水输送至超滤处理装置5中;
(5)超滤处理装置5的浓液依次输送至厌氧池6、好氧池7、MBR8、多介质过滤装置9进行处理,最终排放。
某煤化工企业焦化废水水质
Figure BDA0002505382630000051
尽管本发明的实施方案已公开如上,但其并不仅仅限于说明书和实施方式中所列运用,它完全可以被适用于各种适合本发明的领域,对于熟悉本领域的人员而言,可容易地实现另外的修改,因此在不背离权利要求及等同范围所限定的一般概念下,本发明并不限于特定的细节和这里示出与描述的实施例。

Claims (6)

1.一种煤化工废水处理系统,其特征在于,所述系统包括:蒸氨塔(1)、微波-电催化塔(2)、沉淀反应池(3)、生物吸附池(4)、超滤处理装置(5)、厌氧池(6)、好氧池(7)、MBR(8)、多介质过滤装置(9)、管路混合器(10),所述蒸氨塔(1)上设置石灰入口(11)、焦化废水入口(12)、蒸氨废水输送管(1-2-2)和底泥输送管(1-3-1),所述蒸氨废水输送管(1-2-2)连通所述微波-电催化塔(2),所述微波-电催化塔(2)底部设置脱氮废水输送管(2-3-1),所述脱氮废水输送管(2-3-1)连通所述沉淀反应池(3),所述底泥输送管(1-3-1)连通所述沉淀反应池(3),所述沉淀反应池(3)上清液输送至所述生物吸附池(4),所述生物吸附池(4)连通所述超滤处理装置(5),所述超滤处理装置(5)的浓水口通过浓液输出管(5-6)连通所述厌氧池(6),所述超滤处理装置(5)的淡水口通过滤出液回流管(5-10-3)输送至所述管路混合器(10),所述管路混合器(10)上设置煤气洗涤水进水管(101),所述管路混合器(10)上设置混合液管将混合后的废水输送至所述沉淀反应池(3)中,所述厌氧池(6)连接所述好氧池(7),好氧池(7)连通所述MBR(8),所述MBR(8)连通所述多介质过滤装置(9),经多介质过滤装置(9)处理后的水经过出水管(9-1)排出;所述蒸氨塔中加入石灰进行蒸氨处理,并控制pH在9.8-11.2;所述微波-电催化塔中从上到下依次设置电催化筛板,所述电催化筛板上设置催化剂;所述微波-电催化塔中设置微波水处理装置,所述电催化筛板内设置电极;所述催化剂为TiO2-Ce-金刚石薄膜催化剂,负载在活性炭/沸石上。
2.如权利要求1所述的煤化工废水处理系统,其特征在于,所述MBR(8)产生的污泥通过污泥回流管(8-6)回流至厌氧池(6)。
3.如权利要求1所述的煤化工废水处理系统,其特征在于,所述MBR(8)产生的污泥通过吸附池入泥管(8-4)回流至所述生物吸附池(4)。
4.如权利要求1所述的煤化工废水处理系统,其特征在于,所述焦化废水经过格栅、隔油处理。
5.如权利要求1所述的煤化工废水处理系统,其特征在于,所述沉淀反应池(3)排出泥渣与所述生物吸附池(4)中的剩余污泥混合后进行脱水处理得到脱水污泥。
6.如权利要求5所述的煤化工废水处理系统,其特征在于,脱水污泥经干馏处理制备污泥炭,并将污泥炭输送至蒸氨塔和沉淀反应池中。
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