CN106045235B - 一种高浓度难降解化工废水的处理工艺 - Google Patents
一种高浓度难降解化工废水的处理工艺 Download PDFInfo
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Abstract
本发明公开了一种高浓度难降解化工废水的处理工艺,包括以下步骤:(1)废水收集;(2)调节pH值,初步去除废水中的高浓度氨氮;(3)沉淀分离,上清液流入第一铁碳芬顿反应池与第一调节池废水混合;(4)用盐酸调节pH值,向第一铁碳芬顿反应池投加双氧水和硫酸亚铁,出水与生活污水混合进入厌氧池;(5)经过厌氧池,出水提升至A/O一体池;(6)出水再经过第二铁碳芬顿反应池,沉淀,上清液调节pH值,经过次氯酸钠反应池,进入BAF曝气生物滤池;(7)BAF曝气生物滤池出水经过紫外高级设备,最终经过沉淀池,上清液排入总排放口。本发明的工艺耐冲击负荷高,处理能力强,工艺流程完备,处理效率好。
Description
技术领域
本发明涉及废水处理领域,具体是一种高浓度难降解化工废水的处理工艺。
背景技术
废水处理就是利用物理、化学和生物的方法对废水进行处理,使废水净化,减少污染,以至达到废水回收、复用,充分利用水资源。通过物理作用分离、回收废水中不溶解的呈悬浮状态的污染物(包括油膜和油珠)的废水处理法,可分为重力分离法、离心分离法和筛滤截留法等。以热交换原理为基础的处理法也属于物理处理法。通过化学反应和传质作用来分离、去除废水中呈溶解、胶体状态的污染物或将其转化为无害物质的废水处理法。在化学处理法中,以投加药剂产生化学反应为基础的处理单元是:混凝、中和、氧化还原等;而以传质作用为基础的处理单元则有:萃取、汽提、吹脱、吸附、离子交换以及电渗析和反渗透等。后两种处理单元又合称为膜分离技术。其中运用传质作用的处理单元既具有化学作用,又有与之相关的物理作用,所以也可从化学处理法中分出来 ,成为另一类处理方法,称为物理化学法。通过微生物的代谢作用,使废水中呈溶液、胶体以及微细悬浮状态的有机污染物,转化为稳定、无害的物质的废水处理法。根据作用微生物的不同,生物处理法又可分为需氧生物处理和厌氧生物处理两种类型。废水生物处理广泛使用的是需氧生物处理法,按传统,需氧生物处理法又分为活性污泥法和生物膜法两类。活性污泥法本身就是一种处理单元,它有多种运行方式。属于生物膜法的处理设备有生物滤池、生物转盘、生物接触氧化池以及生物流化床等。生物氧化塘法又称自然生物处理法。厌氧生物处理法,又名生物还原处理法,主要用于处理高浓度有机废水和污泥。使用的处理设备主要为消化池。
目前对于高浓度、色度深、成分复杂、难生化降解的化学合成制药废水处理达到化学合成类制药工业水污染物排放标准(GB21904-2008)是有一定难度的。
发明内容
本发明的目的在于提供一种高浓度难降解化工废水的处理工艺,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:
一种高浓度难降解化工废水的处理工艺,包括以下步骤:
(1)将高COD废水收集在第一调节池,高COD高氨氮废水收集在第二调节池,将生活污水收集在第三调节池;
(2)第二调节池废水提升至MAP反应池,用液碱调节pH至10.5,向MAP反应池内投加磷酸二氢钾和氯化镁,经过气体搅拌混合生成磷酸铵镁沉淀,去除废水中的高浓度氨氮;
(3)混合液流入第一沉淀池和第二沉淀池,沉淀分离,上清液流入第一铁碳芬顿反应池与第一调节池废水混合;
(4)用盐酸调节pH 3-4,向第一铁碳芬顿反应池投加双氧水和硫酸亚铁,形成·OH自由基氧化废水中的难降解有机物,出水与第三调节池的生活污水混合进入厌氧池;
(5)经过厌氧池降解40%COD和部分氨氮,出水提升至A/O一体池,同时硝化液回流到A池,出水经第四沉淀池将污泥回流到O池,去除85%COD和60%氨氮;
(6)出水再经过第二铁碳芬顿反应池进一步降解污水中难降解有机物,第二铁碳芬顿反应后进行沉淀,上清液调节pH为中性,经过次氯酸钠反应池去除色度和氧化污水中氨氮,进入BAF曝气生物滤池;
(7)BAF曝气生物滤池出水经过紫外高级氧化去除剩余COD,最终经过沉淀池,上清液排入总排放口,达标排放。
作为本发明进一步的方案:步骤(6)中所述BAF曝气生物滤池内装填陶粒填料,进一步降解污水中有机物。
与现有技术相比,本发明的有益效果是:本发明的工艺具有耐冲击负荷高,处理能力强,工艺流程完备,处理效率好的特点,可去除化学合成制药废水中含有的甲苯、水合肼等毒性物质,本工艺采取物化预处理+生化处理+深度物化处理+深度生化处理的工艺结合方式进行处理该废水,处理出水达到化学合成类制药工业水污染物排放标准(GB21904-2008)。
附图说明
图1为高浓度难降解化工废水的处理工艺的流程图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明实施例中,一种高浓度难降解化工废水的处理工艺,包括以下步骤:
(1)将高COD废水收集在第一调节池,高COD高氨氮废水收集在第二调节池,将生活污水收集在第三调节池;
(2)第二调节池废水提升至MAP反应池,用液碱调节pH至10.5,向MAP反应池内投加磷酸二氢钾和氯化镁,经过气体搅拌混合生成磷酸铵镁沉淀,去除废水中的高浓度氨氮;
(3)混合液流入第一沉淀池和第二沉淀池,沉淀分离,上清液流入第一铁碳芬顿反应池与第一调节池废水混合;
(4)用盐酸调节pH 3-4,向第一铁碳芬顿反应池投加双氧水和硫酸亚铁,形成·OH自由基氧化废水中的难降解有机物,出水与第三调节池的生活污水混合进入厌氧池;
(5)经过厌氧池降解40%COD和部分氨氮,出水提升至A/O一体池,同时硝化液回流到A池,出水经第四沉淀池将污泥回流到O池,去除85%COD和60%氨氮;
(6)出水再经过第二铁碳芬顿反应池进一步降解污水中难降解有机物,第二铁碳芬顿反应后进行沉淀,上清液调节pH为中性,经过次氯酸钠反应池去除色度和氧化污水中氨氮,进入BAF曝气生物滤池,BAF曝气生物滤池内装填陶粒填料,进一步降解污水中有机物;
(7)BAF曝气生物滤池出水经过紫外高级氧化去除剩余COD,最终经过沉淀池,上清液排入总排放口,达标排放。
本发明的工艺具有耐冲击负荷高,处理能力强,工艺流程完备,处理效率好的特点。该种化学合成制药废水中含有甲苯、水合肼等毒性物质。
对于高浓度、色度深、成分复杂、难生化降解的化学合成制药废水处理达到化学合成类制药工业水污染物排放标准(GB21904-2008)是有一定难度的,本发明的工艺采取物化预处理+生化处理+深度物化处理+深度生化处理的工艺结合方式进行处理该废水,处理出水达到化学合成类制药工业水污染物排放标准(GB21904-2008)。对于水质水量变化较大、难处理的化学合成制药类废水的处理具有很高的借鉴价值;处理该类废水,该工艺具有较大的创新发明意义。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外,应当理解,虽然本说明书按照实施方式加以描述,但并非每个实施方式仅包含一个独立的技术方案,说明书的这种叙述方式仅仅是为清楚起见,本领域技术人员应当将说明书作为一个整体,各实施例中的技术方案也可以经适当组合,形成本领域技术人员可以理解的其他实施方式。
Claims (2)
1.一种高浓度难降解化工废水的处理工艺,其特征在于,包括以下步骤:
(1)将高COD废水收集在第一调节池,高COD高氨氮废水收集在第二调节池,将生活污水收集在第三调节池;
(2)第二调节池废水提升至MAP反应池,用液碱调节pH至10.5,向MAP反应池内投加磷酸二氢钾和氯化镁,经过气体搅拌混合生成磷酸铵镁沉淀,去除废水中的高浓度氨氮;
(3)混合液流入第一沉淀池和第二沉淀池,沉淀分离,上清液流入第一铁碳芬顿反应池与第一调节池废水混合;
(4)用盐酸调节pH 3-4,向第一铁碳芬顿反应池投加双氧水和硫酸亚铁,形成·OH自由基氧化废水中的难降解有机物,出水与第三调节池的生活污水混合进入厌氧池;
(5)经过厌氧池降解40%COD和部分氨氮,出水提升至A/O一体池,同时硝化液回流到A池,出水经第四沉淀池将污泥回流到O池,去除85%COD和60%氨氮;
(6)出水再经过第二铁碳芬顿反应池进一步降解污水中难降解有机物,第二铁碳芬顿反应后进行沉淀,上清液调节pH为中性,经过次氯酸钠反应池去除色度和氧化污水中氨氮,进入BAF曝气生物滤池;
(7)BAF曝气生物滤池出水经过紫外高级氧化去除剩余COD,最终经过沉淀池,上清液排入总排放口,达标排放。
2.根据权利要求1所述的高浓度难降解化工废水的处理工艺,其特征在于,步骤(6)所述BAF曝气生物滤池内装填陶粒填料,进一步降解污水中有机物。
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