CN111547953B - 一种焦化废水与煤气洗涤水联合处理工艺 - Google Patents
一种焦化废水与煤气洗涤水联合处理工艺 Download PDFInfo
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Abstract
本发明公开了一种焦化废水与煤气洗涤水联合处理工艺,该工艺在处理过程中将煤气洗涤水与焦化废水混合处理,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。
Description
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
焦化工业以煤为原料,主要由炼焦系统、煤气净化等组成,煤在焦炉碳化过程中,会产生大量的荒煤气,其中夹带大量碳化时生成的化学物质。在对应不同工艺中会产生相应的废水,由于生产过程中产生的焦化废水及其复杂、毒性强、浓度差别大、种类多,很多废水具有回收效益,但有些废水中由于其污染物的特殊,很难进行回收,因此在废水处理过程中,需要针对不同水质情况,对其进行差别化或综合处理。焦化废水中含有大量的含氮物质,通常情况下采用蒸氨处理,但是即便采用了蒸氨工艺处理,在废水处理结束时,废水中还是存在高浓度的氨氮,由于氨氮的存在,影响了处理场地的空气,这严重影响了操作人员的健康,同时还不满足排放标准,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:
本发明公开了一种焦化废水与煤气洗涤水联合处理工艺,(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,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中;
(5)超滤处理装置的浓液依次输送至厌氧池、好氧池、MBR、多介质过滤装置进行处理,最终排放。
进一步地,所述MBR产生的污泥通过污泥回流管回流至厌氧池;
进一步地,所述MBR产生的污泥通过吸附池入泥管回流至所述生物吸附池;
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,所述沉淀反应池排出泥渣与所述生物吸附池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;
进一步地,对所述污泥炭改性,所述改性为将污泥炭浸泡在氯化镁溶液中,所述氯化镁溶液浓度为20g/L,浸泡风干后即得改性污泥碳,在沉淀反应工艺中投加所述改性污泥碳。
本发明的焦化废水与煤气洗涤水联合处理工艺,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煤气洗涤水中氟离子浓度,而煤气洗涤水中的营养元素(磷、微量元素)又可以为微生物提供必要营养,提高微生物降解效率,不需要外加磷源;
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是焦化废水与煤气洗涤水联合处理工艺示意图;
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;所述催化剂为TiO2-Ce-金刚石薄膜催化剂并负载在活性炭/沸石上;
(3)将微波-电催化处理后的焦化废水输送至沉淀反应池,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中;
(5)超滤处理装置的浓液依次输送至厌氧池、好氧池、MBR、多介质过滤装置进行处理,最终排放。
某煤化工企业焦化废水水质
实施例2
在实施例1的基础上,对所述污泥炭改性,所述改性为将污泥炭浸泡在氯化镁溶液中,所述氯化镁溶液浓度为20g/L,浸泡风干后即得改性污泥碳,在沉淀反应工艺及蒸氨塔工艺中投加所述改性污泥碳,投加量为5g/L,然后对沉淀反应后的产物进行冲洗、分离得到污泥炭肥料;
所述污泥炭肥料中含有鸟粪石,该污泥炭肥料与污泥炭有机结合在一起,作为肥料可以为土壤提供有机质及氮磷元素。
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 (5)
1.一种焦化废水与煤气洗涤水联合处理工艺,其特征在于,包括如下步骤:
(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,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;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,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;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,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;
(3)将微波-电催化处理后的焦化废水输送至沉淀反应池,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中;
(5)超滤处理装置的浓液依次输送至厌氧池、好氧池、MBR、多介质过滤装置进行处理,最终排放;
所述沉淀反应池排出泥渣与所述生物吸附池中的剩余污泥混合后进行脱水处理得到脱水污泥;脱水污泥经干馏处理制备污泥炭,对所述污泥炭改性,所述改性为将污泥炭浸泡在氯化镁溶液中,所述氯化镁溶液浓度为20g/L,浸泡风干后即得改性污泥炭,在沉淀反应工艺中投加所述改性污泥炭。
2.如权利要求1所述的焦化废水与煤气洗涤水联合处理工艺,其特征在于,所述MBR产生的污泥通过污泥回流管回流至厌氧池。
3.如权利要求1所述的焦化废水与煤气洗涤水联合处理工艺,其特征在于,所述MBR产生的污泥通过吸附池入泥管回流至所述生物吸附池。
4.如权利要求1所述的焦化废水与煤气洗涤水联合处理工艺,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所述的焦化废水与煤气洗涤水联合处理工艺,其特征在于,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。
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