CN110124488A - 一种用于生化处理中VOCs治理及尾气再利用工艺 - Google Patents
一种用于生化处理中VOCs治理及尾气再利用工艺 Download PDFInfo
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Abstract
本发明公开了一种用于生化处理中VOCs治理及尾气再利用工艺,该工艺生化处理产生的尾气经集气罩收集后进入VOCs处理单元,VOCs处理后的尾气进入吸收槽处理得到碳酸钠溶液,吸收槽处理剩余尾气进入变压吸附处理,得到的氮气回收利用,氧气经臭氧发生器处理后回用于臭氧催化氧化处理;该发明工艺将生化处理池中尾气收集,有效对VOCs处理,减少空气污染;将生化处理池中尾气收集,并分离尾气中氮气、氧气、二氧化碳,分别回用于气浮除油、臭氧催化氧化和化学软化,充分将尾气资源化再利用,降低运行成本。
Description
技术领域
本发明属于废水深度处理领域,尤其涉及一种用于生化处理中VOCs治理及尾气再利用工艺。
背景技术
随着中国社会经济持续高速发展,煤化工行业也占据了重要地位。煤化工行业生产废水具有有机物浓度高、盐度高、成分复杂等特点,废水的肆意排放会污染地表水、地下水、河流湖泊等,从而污染土地、破坏生态系统,间接的威胁到人类的生活健康,在水资源匮乏的情况下,废水处理回用十分必要。
煤化工废水成分复杂,含有油类、氨氮、酚类化合物及其他高浓度有机物和大量无机盐,废水可生化性差。目前煤化工废水处理工艺常采用的技术包括:酚氨回收技术、除油技术、生化处理技术、软化技术、高级氧化技术、膜浓缩等技术,针对有机物的去除工艺也成为了研究热点,多采用生化处理技术组合联用或高级氧化技术等,但处理过程中常伴有尾气生成,臭氧催化氧化中产生的尾气得到良好的处理并回收利用,但生化处理过程中挥发性有机物以及二氧化碳、氮气、氧气等气体,因浓度不高并未得到足够的重视,但长久以此对环境同样会造成污染和损害,因此尾气处理是十分必要的。
CN103288299B公开了一种煤化工废水的生化处理方法,包括预处理、厌氧处理、一级好氧处理、缺氧处理、二级好氧处理、混凝沉淀、砂滤。该技术方案优化了生化处理单元,提高了有机物降解能力,但多级好氧及缺氧处理的设置,并未对尾气进行适当处理。
发明内容
针对上述问题,本发明提供了一种用于生化处理中VOCs治理及尾气再利用工艺,该工艺主要是通过对传统的生化处理单元进行改进,通过集气盖收集尾气,在此基础上进一步去除VOCs、二氧化碳、氮气和氧气,并将氮气和氧气回收利用于处理工艺,实现了尾气资源化再利用,减少空气污染,降低运行成本。
为达此目的,本发明采用以下技术方案:
一种用于生化处理中VOCs治理及尾气再利用工艺,其特征在于,生化处理产生的尾气经集气罩收集后进入VOCs处理单元,VOCs处理后的尾气进入吸收槽处理得到碳酸钠溶液,吸收槽处理剩余尾气进入变压吸附处理,得到的氮气回收利用,氧气经臭氧发生器处理后回用于臭氧催化氧化处理。
所述生化处理单元包括厌氧池、缺氧池和好氧池。
所述厌氧池中废水pH为7~7.5,水力停留时间为1~5h;
缺氧池废水pH为6~8.5,水力停留时间为2~6h;
好氧池废水pH为6~8.5,水力停留时间为10-25h;
经生化处理后的废水COD去除率达到80~95%。
在缺氧池和好氧池顶部设置集气罩,使缺氧池和好氧池封闭,以富集尾气,并通过气泵由池顶抽吸进入VOCs处理单元。
VOCs处理单元包括活性炭吸附、水喷淋、催化燃烧、溶液吸收中的任意一种或至少两种的组合;经处理后VOCs去除率≥50%。
VOCs处理后的尾气进行吸收槽处理;吸收槽中投加碱液用于吸收尾气中的二氧化碳;所述碱液优选为氢氧化钠稀溶液;得到的碳酸钠溶液,浓度≥10%,可回用于化学软化。
吸收槽处理剩余尾气进行变压吸附处理,将氮气与氧气分离,分离出的氮气回用于气浮除油,氧气进入臭氧发生器处理后回用于臭氧催化氧化处理
与现有技术相比,本发明具有以下有益效果:
(1)将生化处理池中尾气收集,有效对VOCs处理,减少空气污染;
(2)将生化处理池中尾气收集,并分离尾气中氮气、氧气、二氧化碳,分别回用于气浮除油、臭氧催化氧化和化学软化,充分将尾气资源化再利用,降低运行成本。
附图说明
图1 是本发明用于VOCs治理及尾气再利用工艺流程图。
具体实施方式
为了更好地说明本发明,便于理解本发明的技术方案,本发明的典型但非限制性的实施例如下:
如图1所示,一种用于生化处理中VOCs治理及尾气再利用工艺,废水经重力除油和气浮除油后进入生化处理,生化处理出水进入化学软化,化学软化后的废水进一步进入臭氧催化氧化处理和深度处理,在生化处理过程中产生的尾气经集气罩收集后进入VOCs处理单元,VOCs处理后的尾气进入吸收槽处理得到碳酸钠溶液,吸收槽处理剩余尾气进入变压吸附处理,得到的氮气回收利用,氧气经臭氧发生器处理后回用于臭氧催化氧化处理。
其中,生化处理单元包括厌氧池、缺氧池和好氧池,厌氧池中废水pH为7~7.5,水力停留时间为1~5h;缺氧池废水pH为6~8.5,水力停留时间为2~6h;
好氧池废水pH为6~8.5,水力停留时间为10-25h;经生化处理后的废水COD去除率达到80~95%。
在缺氧池和好氧池顶部设置集气罩,使缺氧池和好氧池封闭,以富集尾气,并通过气泵由池顶抽吸进入VOCs处理单元。VOCs处理单元包括活性炭吸附、水喷淋、催化燃烧、溶液吸收中的任意一种或至少两种的组合;经处理后VOCs去除率≥50%。
VOCs处理后的尾气进行吸收槽处理;吸收槽中投加碱液用于吸收尾气中的二氧化碳;所述碱液优选为氢氧化钠稀溶液;得到的碳酸钠溶液,浓度≥10%,可回用于化学软化。
吸收槽处理剩余尾气进行变压吸附处理,将氮气与氧气分离,分离出的氮气回用于气浮除油,氧气进入臭氧发生器处理后回用于臭氧催化氧化处理。
实施例1
某煤化工厂废水COD为1000mg/L,油含量50mg/L,硬度300mg/L,采用如下方法对该废水进行预处理:
1、将煤化工预处理后废水采用重力除油处理:所述重力除油采用隔油池除油技术,出水油含量45mg/L;
2、经重力除油处理后的废水采用气浮除油处理:所述气浮除油为部分加压溶气气浮,气源为惰性气体氮气,并投加絮凝剂聚合氯化铝,用量为50mg/L,水力停留时间10min,油含量4mg/L;
3、经气浮除油后废水采用生化处理:所述生化处理优选为厌氧池、缺氧池、好氧池组合工艺,厌氧池pH为7,水力停留时间1h,缺氧池pH为7.5,水力停留时间2h,好氧池pH为7.5,水力停留时间10h,出水COD降低为100mg/L;
4、经缺氧池、好氧池顶部设置的集气罩,使缺氧池、好氧池封闭,富集尾气,通过气泵由池顶抽吸尾气进入VOCs处理单元;
5、经富集抽吸出的尾气采用VOCs处理,所述VOCs处理技术为活性炭吸和水喷淋组合工艺,VOCs去除率为60%;
6、经VOCs处理后的尾气采用吸收槽处理,所述吸收槽中充有氢氧化钠碱液,吸收尾气中二氧化碳气体,使碳酸钠溶液浓度为10%时,用于化学软化单元;
7、经吸收槽后剩余尾气采用变压吸附处理:将尾气中分离出的氮气和氧气,分别输送至气浮除油单元和臭氧发生器单元;
8、经生化处理后出水采用化学软化处理,所述化学软化的试剂优选为氢氧化钠和碳酸钠,氢氧化钠添加量为300mg/L,碳酸钠添加量为700mg/L,出水硬度降低为45mg/L;
9、经化学软化过滤出水采用臭氧催化氧化处理,臭氧投加量60mg/L,水力停留时间0.5小时,出水COD降低为50mg/L。
实施例2
某煤化工厂废水COD为1500mg/L,油含量70mg/L,硬度500mg/L,采用如下方法对该废水进行预处理:
1、将煤化工预处理后废水采用重力除油处理:所述重力除油采用隔油池除油技术,出水油含量63mg/L;
2、经重力除油处理后的废水采用气浮除油处理:所述气浮除油为部分加压溶气气浮,气源为惰性气体氮气,并投加絮凝剂聚合氯化铝,用量为70mg/L,水力停留时间15min,油含量6mg/L;
3、经气浮除油后废水采用生化处理:所述生化处理优选为厌氧池、缺氧池、好氧池组合工艺,厌氧池pH为7,水力停留时间2h,缺氧池pH为7.5,水力停留时间2h,好氧池pH为7.5,水力停留时间12h,出水COD降低为130mg/L;
4、经缺氧池、好氧池顶部设置的集气罩,使缺氧池、好氧池封闭,富集尾气,通过气泵由池顶抽吸尾气进入VOCs处理单元;
5、经富集抽吸出的尾气采用VOCs处理,所述VOCs处理技术为活性炭吸和水喷淋组合工艺,VOCs去除率为65%;
6、经VOCs处理后的尾气采用吸收槽处理,所述吸收槽中充有氢氧化钠碱液,吸收尾气中二氧化碳气体,使碳酸钠溶液浓度为10%时,用于化学软化单元;
7、经吸收槽后剩余尾气采用变压吸附处理:将尾气中分离出的氮气和氧气,分别输送至气浮除油单元和臭氧发生器单元;
8、经生化处理后出水采用化学软化处理,所述化学软化的试剂优选为氢氧化钠和碳酸钠,氢氧化钠添加量为550mg/L,碳酸钠添加量为1000mg/L,出水硬度降低为70mg/L;
9、经化学软化过滤出水采用臭氧催化氧化处理,臭氧投加量60mg/L,水力停留时间1小时,出水COD降低为60mg/L。
实施例3
某煤化工厂废水COD为3000mg/L,油含量80mg/L,硬度700mg/L,采用如下方法对该废水进行预处理:
1、将煤化工预处理后废水采用重力除油处理:所述重力除油采用隔油池除油技术,出水油含量70mg/L;
2、经重力除油处理后的废水采用气浮除油处理:所述气浮除油为部分加压溶气气浮,气源为惰性气体氮气,并投加絮凝剂聚合氯化铝,用量为80mg/L,水力停留时间20min,油含量6.5mg/L;
3、经气浮除油后废水采用生化处理:所述生化处理优选为厌氧池、缺氧池、好氧池组合工艺,厌氧池pH为7,水力停留时间3h,缺氧池pH为7.5,水力停留时间3h,好氧池pH为7.5,水力停留时间15h,出水COD降低为260mg/L;
4、经缺氧池、好氧池顶部设置的集气罩,使缺氧池、好氧池封闭,富集尾气,通过气泵由池顶抽吸尾气进入VOCs处理单元;
5、经富集抽吸出的尾气采用VOCs处理,所述VOCs处理技术为活性炭吸和水喷淋组合工艺,VOCs去除率为55%;
6、经VOCs处理后的尾气采用吸收槽处理,所述吸收槽中充有氢氧化钠碱液,吸收尾气中二氧化碳气体,使碳酸钠溶液浓度为10%时,用于化学软化单元;
7、经吸收槽后剩余尾气采用变压吸附处理:将尾气中分离出的氮气和氧气,分别输送至气浮除油单元和臭氧发生器单元;
8、经生化处理后出水采用化学软化处理,所述化学软化的试剂优选为氢氧化钠和碳酸钠,氢氧化钠添加量为680mg/L,碳酸钠添加量为1400mg/L,出水硬度降低为90mg/L;
9、经化学软化过滤出水采用臭氧催化氧化处理,臭氧投加量750mg/L,水力停留时间2小时,出水COD降低为110mg/L。
申请人声明,本发明通过上述实施例来说明本发明的详细方法,但本发明并不局限于上述详细方法,即不意味着本发明必须依赖上述详细方法才能实施。所属技术领域的技术人员应该明了,对本发明的任何改进,对本发明产品各原料的等效替换及辅助成分的添加、具体方式的选择等,均落在本发明的保护范围和公开范围之内。
Claims (7)
1.一种用于生化处理中VOCs治理及尾气再利用工艺,其特征在于,生化处理产生的尾气经集气罩收集后进入VOCs处理单元,VOCs处理后的尾气进入吸收槽处理得到碳酸钠溶液,吸收槽处理剩余尾气进入变压吸附处理,得到的氮气回收利用,氧气经臭氧发生器处理后回用于臭氧催化氧化处理。
2.如权利要求1所述的工艺,其特征在于,所述生化处理单元包括厌氧池、缺氧池和好氧池。
3.如权利要求2所述的工艺,其特征在于,所述厌氧池中废水pH为7~7.5,水力停留时间为1~5h;缺氧池废水pH为6~8.5,水力停留时间为2~6h;好氧池废水pH为6~8.5,水力停留时间为10-25h;经生化处理后的废水COD去除率达到80~95%。
4.如权利要求3所述的工艺,其特征在于,在缺氧池和好氧池顶部设置集气罩,使缺氧池和好氧池封闭,以富集尾气,并通过气泵由池顶抽吸进入VOCs处理单元。
5.如权利要求4所述的工艺,其特征在于,VOCs处理单元包括活性炭吸附、水喷淋、催化燃烧、溶液吸收中的任意一种或至少两种的组合;经处理后VOCs去除率≥50%。
6.如权利要求5所述的工艺,其特征在于,VOCs处理后的尾气进行吸收槽处理;吸收槽中投加碱液用于吸收尾气中的二氧化碳;所述碱液优选为氢氧化钠稀溶液;得到的碳酸钠溶液,浓度≥10%,可回用于化学软化。
7.如权利要求6所述的工艺,其特征在于,吸收槽处理剩余尾气进行变压吸附处理,将氮气与氧气分离,分离出的氮气回用于气浮除油,氧气进入臭氧发生器处理后回用于臭氧催化氧化处理。
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