CN113277659A - 一种有机氯废水分级处理及资源化回收系统 - Google Patents

一种有机氯废水分级处理及资源化回收系统 Download PDF

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CN113277659A
CN113277659A CN202110831891.5A CN202110831891A CN113277659A CN 113277659 A CN113277659 A CN 113277659A CN 202110831891 A CN202110831891 A CN 202110831891A CN 113277659 A CN113277659 A CN 113277659A
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何力波
周凯旋
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Nantong Zheyuan Qingheng Environmental Technology Co ltd
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Abstract

本发明公开了一种有机氯废水分级处理及资源化回收系统,包括依次设置的超声脱氯单元、一次超滤、铁碳脱氯单元、二次超滤、氧化单元、絮凝单元、吸附单元、焚烧单元,吸附单元出水外排。所述一次超滤所得浓缩液输送至所述铁碳脱氯单元,所述二次超滤所得浓缩液输送至所述氧化单元,所述一次超滤和二次超滤所得透过液输送至结晶单元,所述超声脱氯单元内设有超声波发生器并填充有Cu/Fe/Ag复合金属粉末,所述Cu:Fe:Ag质量比为1‑5:25‑50:0.5‑1,所述超声波频率为22‑28kHz,声强为35‑45W/cm2;所述氧化单元为Fenton单元,所述铁碳脱氯单元中设有一体成型的Pd/Fe/C填料,所述Pd:Fe:C质量比为2‑5:30‑50:20‑30。本发明通过对有机氯废水进行分级脱氯和两次超滤处理以实现废水中有机氯的高效去除,并将一次和二次超滤透过液送入结晶单元得到回收盐。

Description

一种有机氯废水分级处理及资源化回收系统
技术领域
本发明属于废水处理领域,具体涉及一种有机氯废水分级处理及资源化回收系统。
背景技术
有机氯化合物是一种重要的化工原料,在化工、医药、农药、制革等行业中使用广泛,结果导致有机氯废水大量排放,很多地表水、地下水受到有机氯的污染。有机氯化合物具有难生物降解性,对微生物和人类健康均具有很大毒性。目前处理有机氯废水的方法有生物法、物化法、电化学法、氧化还原法焚烧法等,但这些方法因不同原因降解效率低、产生氯代副产物等受到很大限制,而还原脱氯是一种降低有机氯毒性,提高其生化或焚烧性能的重要途径,因此,如何高效还原有机氯脱氯成为人们关注的重点。
其中,大量利用零价金属降解有机卤化物的研究,包括降解性能、反应动力学、影响因素、应用实验等均已广泛展开。现由有技术中,普通铁屑的回收利用率较低,导致反应过程延长,频繁的更换反应中使用的零价金属铁,降低了降解效率。
发明内容
本发明的目的是提供一种有机氯废水分级处理及资源化回收系统,通过对有机氯废水进行分级脱氯和两次超滤处理以实现废水中有机氯污染物的高效去除,并将一次和二次超滤透过液送入结晶单元得到回收盐。
为了解决上述技术问题,本发明公开了一种有机氯废水分级处理及资源化回收系统,包括依次设置的超声脱氯单元、一次超滤、铁碳脱氯单元、二次超滤、氧化单元、絮凝单元、吸附单元、焚烧单元,吸附单元出水外排,所述一次超滤所得浓缩液输送至所述铁碳脱氯单元,所述二次超滤所得浓缩液输送至所述氧化单元,所述超声脱氯单元内设有超声波发生器和脱氯填料,所述一次超滤和二次超滤所得透过液输送至结晶单元,所述氧化单元为Fenton单元。
进一步地,超声脱氯单元内脱氯填料为Cu/Fe/Ag复合金属粉末和活性炭,所述活性炭与Cu/Fe/Ag复合金属粉末质量比为10-20:5-50,所述Cu:Fe:Ag质量比为1-5:25-50:0.5-1,所述超声波频率为22-28kHz,声强为35-45W/cm2;所述氧化单元为Fenton单元;所述铁碳脱氯单元中设有一体成型的Pd/Fe/C填料,所述Pd:Fe:C质量比为2-5:30-50:20-30;所述超声脱氯单元水力停留时间15-45min;所述铁碳脱氯单元水力停留时间20-60min;
进一步地,所述超声脱氯单元前还设置有预处理单元;
进一步地,所述预处理单元包括格栅、气浮池、隔油池中的一种或多种;
进一步地,所述预处理单元和所述超声脱氯单元之间还设置初级超滤单元;
进一步地,所述絮凝单元投加活性炭和/或聚丙烯酰胺;
进一步地,所述吸附单元投加干污泥、活性炭、秸秆颗粒中的一种或多种;
进一步地,所述吸附单元沉渣脱水后输送至焚烧单元焚烧;
本发明的有益效果:
1、本申请设置超声脱氯单元和铁碳脱氯单元进行分级脱氯处理,超声脱氯单元内采用Cu/Fe/Ag复合金属粉末及活性炭相互配合,发挥了金属还原、吸附、Fe/C内电解、催化还原等一系列综合作用过程对有机氯废水中氯代程度高的有机化合物中的氯进行快速脱氯处理;铁碳脱氯单元设置一体成型Pd/Fe/C填料,该填料在Pd的作用下,对于脱氯后的氯代程度低的有机物进行高效脱氯,通过两者脱氯单元的配合设置能够将废水中的有机氯更为彻底去除。
2、本申请设置两级超滤处理,对经过超声脱氯单元和铁碳脱氯单元脱氯处理后废水中的氯离子进行分离,由于在过多氯离子存在的情况下,会影响后续铁碳填料板结和氧化单元的处理效果,另外,通过超滤设置将氯离子进行分离的同时也将有机物进行浓缩,既提高污染物浓度,降低后续处理量,又可以降低氯离子浓度,提高后续处理效果。
3、将一次和二次超滤透过液送入结晶单元得到回收盐,实现了有机氯废水的资源化回收。
4、本申请设置氧化单元,由于有机氯废水中成分复杂,在经过两级脱氯和两次超滤后的废水中还存在部分难降解有机物,设置Fenton氧化处理将剩余部分有机物氧化,且在废水中存在铁絮体,含铁絮体的废水进入到絮凝单元、吸附单元将废水中残留的有机物吸附在吸附介质上,进行燃烧,可以提高燃烧热值的同时,满足排放标准。
附图说明
图1为一种有机氯废水分级处理及资源化回收系统示意图。
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
经预处理后的有机氯废水含四氯化碳89mg/L;
所述有机氯废水经超声脱氯单元处理,超声波频率在25kHz,声强在35W/cm2,水力停留时间12min,四氯化碳浓度降低至1.3mg/L;经一次超滤浓缩后的有机氯化合物浓度为127.2mg/L,进入铁碳脱氯单元处理,水力停留时间23min后有机氯浓度降低至2.3mg/L,继续二次超滤浓缩后输送至氧化单元对有机氯废水进行氧化处理,氧化单元处理后出水有机氯浓度为0.42mg/L,后续经过絮凝单元、吸附单元处理后,将吸附单元和絮凝单元的沉渣脱水处理后送入焚烧单元,焚烧单元烟气和/不凝物中未检出有机氯污染物。
实施例2
经预处理后的有机氯废水含四氯化碳89mg/L;
所述有机氯废水经超声脱氯单元处理,未开启超声装置,水力停留时间12min,四氯化碳浓度降低至4.3mg/L;经初级超滤浓缩后的有机氯化合物浓度为143.2mg/L,进入铁碳脱氯单元处理,水力停留时间23min后有机氯浓度降低至6.3mg/L,继续超滤浓缩后输送至氧化单元对有机氯废水进行氧化处理,氧化单元处理后出水有机氯浓度为0.98mg/L,后续经过絮凝单元、吸附单元处理后,将吸附单元和絮凝单元的沉渣脱水处理后送入焚烧单元,焚烧单元烟气和/不凝物中未检出有机氯污染物。
实施例3
经预处理(气浮、隔油)后的浓缩医疗有机氯废水含有机氯浓度为0.63wt%;
所述有机氯废水经超声脱氯单元处理,超声波频率在25kHz,声强在35W/cm2,水力停留时间12min;经一次超滤浓缩后的有机氯化合物浓度为1.72wt%,进入铁碳脱氯单元处理,水力停留时间23min后有机氯浓度降低至0.03wt%,继续二次超滤浓缩后输送至氧化单元对有机氯废水进行氧化处理,氧化单元处理后出水有机氯浓度为0.01wt%,后续经过絮凝单元、吸附单元处理后,将吸附单元和絮凝单元的沉渣脱水处理后送入焚烧单元,焚烧单元烟气和/不凝物中未检出有机氯污染物。
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)

1.一种有机氯废水分级处理及资源化回收系统,其特征在于,包括依次设置的超声脱氯单元、一次超滤、铁碳脱氯单元、二次超滤、氧化单元、絮凝单元、吸附单元、焚烧单元,吸附单元出水外排,所述一次超滤所得浓缩液输送至所述铁碳脱氯单元,所述二次超滤所得浓缩液输送至所述氧化单元,所述超声脱氯单元内设有超声波发生器和脱氯填料,所述一次超滤和二次超滤所得透过液输送至结晶单元,所述氧化单元为Fenton单元。
2.如权利要求1所述的一种有机氯废水分级处理及资源化回收系统,其特征在于:所述超声脱氯单元内脱氯填料为Cu/Fe/Ag复合金属粉末和活性炭,所述活性炭与Cu/Fe/Ag复合金属粉末质量比为10-20:5-50,所述Cu:Fe:Ag质量比为1-5:25-50:0.5-1,所述超声波频率为22-28kHz,声强为35-45W/cm2;所述铁碳脱氯单元中设有一体成型的Pd/Fe/C填料,所述Pd:Fe:C质量比为2-5:30-50:20-30;所述超声脱氯单元水力停留时间15-45min;所述铁碳脱氯单元水力停留时间20-60min。
3.如权利要求1所述的一种有机氯废水分级处理及资源化回收系统,其特征在于,所述超声脱氯单元前还设置有预处理单元,所述预处理单元包括格栅、气浮池、隔油池中的一种或多种。
4.如权利要求3所述的一种有机氯废水分级处理及资源化回收系统,其特征在于,所述预处理单元和所述超声脱氯单元之间还设置初级超滤单元。
5.如权利要求1所述的一种有机氯废水分级处理及资源化回收系统,其特征在于,所述絮凝单元投加活性炭和/或聚丙烯酰胺。
6.如权利要求1所述的一种有机氯废水分级处理及资源化回收系统,其特征在于,所述吸附单元投加干污泥、活性炭、秸秆颗粒中的一种或多种,所述吸附单元的沉渣脱水后输送至焚烧单元焚烧。
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