CN114477598B - 一种焦化反渗透浓水零排放工艺 - Google Patents
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Abstract
本发明涉及水处理技术领域,且公开了一种焦化反渗透浓水零排放工艺,包括一级进水泵、有机物吸附塔、二级进水泵、除氟吸附塔、三级进水泵和蒸发结晶系统,所述一级进水泵的输出端与有机物吸附塔的输入端相连接,所述二级进水泵的输入端和输出端分别与有机物吸附塔的输出端和除氟吸附塔的输入端相连接,所述三级进水泵的输入端和输出端分别与除氟吸附塔的输出端和蒸发结晶系统的输入端相连接;本发明一次性投资低;废液处理效果稳定;生产运行成本低;自动化程度高,操作简单。本发明充分体现了节能减排的效果,是环境友好型的绿色钢铁生产工艺。
Description
技术领域
本发明涉及水处理技术领域,具体为一种焦化反渗透浓水零排放工艺。
背景技术
废水回用是废水处理的最终目标,是企业节能减排的实施手段。目前简单的焦化废水回用技术已经无法满足企业要求,将生化处理后的焦化废水进行深度处理后回用是必然的趋势。国内的焦化废水深度处理技术是采用反渗透和反渗透技术将焦化废水深度处理后回用作为钢铁企业循环冷却用水,但存在的主要问题是反渗透产生的浓水的处理。因此,反渗透工艺产生的污染物如果未经处理而直接排放,势必会对水体环境产生极大的危害。
针对这一情况,本发明根据了焦化反渗透浓水的水质水量情况,开发出经济、高效的零排放工艺。开发焦化反渗透浓水的零排放工艺和装置,以绿色工艺和节能减排为主要任务,减少环境污染,积极应对日益严格的环境保护法规。
发明内容
(一)解决的技术问题
针对现有技术的不足,本发明提供了一种焦化反渗透浓水零排放工艺,解决了上述背景技术中所存在的问题。
(二)技术方案
为实现上述目的,本发明提供如下技术方案:一种焦化反渗透浓水零排放工艺,包括一级进水泵、有机物吸附塔、二级进水泵、除氟吸附塔、三级进水泵和蒸发结晶系统,所述一级进水泵的输出端与有机物吸附塔的输入端相连接,所述二级进水泵的输入端和输出端分别与有机物吸附塔的输出端和除氟吸附塔的输入端相连接,所述三级进水泵的输入端和输出端分别与除氟吸附塔的输出端和蒸发结晶系统的输入端相连接,所述有机物吸附塔的内部填充有改性活性半焦-硅藻土填料,所述除氟吸附塔的内部填充有改性氧化铝填料;
所述一级进水泵将TOC为6-21mg/L,氟离子为23-35mg/L,电导率为82450-93780μs/cm的焦化反渗透浓水泵入到有机物吸附塔中,并在有机物吸附塔中停留45-60min,经过有机物吸附塔后,焦化反渗透浓水中的TOC为2-7mg/L;
然后,经过有机物吸附塔的焦化反渗透浓水通过二级进水泵进入到除氟吸附塔中,并在除氟吸附塔中停留25-45min,经过除氟吸附塔后,焦化反渗透浓水中氟离子为7-13mg/L;
随后,经过除氟吸附塔的焦化反渗透浓水通过三级进水泵进入到蒸发结晶系统中,蒸发后得到纯度在99.2%以上的氯化钠。
优选的,所述改性活性半焦-硅藻土填料占整个有机物吸附塔的85-95%。
优选的,所述改性活性半焦-硅藻土填料的制备方法如下:
S1、将活性半焦和硅藻土按照质量比3-7:1混合,机械搅拌32-45min,搅拌速度为35-55r/min,形成固体混合物;
S2、将所得固体混合物以2-4℃/min的升温速率从室温升至215-245℃,恒温1.5-2.5h进行预氧化;
S3、将冷却后的混合物浸入质量比为7-11%的氢氧化钠溶液,超声45-55min,将于混合均匀,浸渍3-4h,然后将固体混合物取出后干燥,然后置于马弗炉中进行活化处理,在氮气气氛中以3-4℃/min的升温速率升温至320-370℃,恒温1-2h,冷却后得改性活性半焦-硅藻土填料。
优选的,所述改性活性半焦-硅藻土填料比表面积为313-415m2/g,孔容为0.13-0.24cm3/g,所形成的孔主要由中微孔构成。
优选的,所述改性氧化铝填料占整个除氟吸附塔的85-95%。
优选的,所述改性氧化铝填料的制备方法如下:
S1、将对氟离子的饱和吸附量为5.1-6.8mg/g的氧化铝、钢渣和蛭石按照质量比6-9:3:1混合,机械搅拌20-30min,搅拌速度为35-55r/min,形成固体混合物;
S2、固体混合物后的放入0.2-0.5%聚硅酸钠溶液中,浸泡120-180min;
S3、将固体混合物过滤,晾干,放入马弗炉中,马弗炉以5℃/min的升温速率升温至320-360℃,恒温2-3h,然后冷却至室温,得到改性氧化铝填料。
优选的,所述改性氧化铝填料对氟离子吸附饱和量为9.2-13.4mg/g。
(三)有益效果
本发明提供了一种焦化反渗透浓水零排放工艺,具备以下有益效果:
本发明一次性投资低;废液处理效果稳定;生产运行成本低;自动化程度高,操作简单。本发明充分体现了节能减排的效果,是环境友好型的绿色钢铁生产工艺。
附图说明
图1为本发明的工艺流程示意图。
图中:1、一级进水泵;2、有机物吸附塔;3、改性活性半焦-硅藻土填料;4、二级进水泵;5、除氟吸附塔;6、改性氧化铝填料;7、三级进水泵;8、蒸发结晶系统。
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。
实施例1
如图1所示,本发明提供一种技术方案:一种焦化反渗透浓水零排放工艺,包括一级进水泵1、有机物吸附塔2、二级进水泵4、除氟吸附塔5、三级进水泵7和蒸发结晶系统8,一级进水泵1的输出端与有机物吸附塔2的输入端相连接,二级进水泵4的输入端和输出端分别与有机物吸附塔2的输出端和除氟吸附塔5的输入端相连接,三级进水泵7的输入端和输出端分别与除氟吸附塔5的输出端和蒸发结晶系统8的输入端相连接,有机物吸附塔2的内部填充有改性活性半焦-硅藻土填料3,改性活性半焦-硅藻土填料3占整个有机物吸附塔2的85-95%,除氟吸附塔5的内部填充有改性氧化铝填料6,改性氧化铝填料6占整个除氟吸附塔5的95%;
一级进水泵1将TOC为21mg/L,氟离子为35mg/L,电导率为89450μs/cm的焦化反渗透浓水泵入到有机物吸附塔2中,并在有机物吸附塔2中停留60min,经过有机物吸附塔2后,焦化反渗透浓水中的TOC为5mg/L;
然后,经过有机物吸附塔2的焦化反渗透浓水通过二级进水泵4进入到除氟吸附塔5中,并在除氟吸附塔5中停留45min,经过除氟吸附塔5后,焦化反渗透浓水中氟离子为11mg/L;
随后,经过除氟吸附塔5的焦化反渗透浓水通过三级进水泵7进入到蒸发结晶系统8中,蒸发后得到纯度在99.6%的氯化钠。
改性活性半焦-硅藻土填料3的制备方法如下:
S1、将活性半焦和硅藻土按照质量比7:1混合,机械搅拌45min,搅拌速度为55r/min,形成固体混合物;
S2、将所得固体混合物以4℃/min的升温速率从室温升至245℃,恒温2.5h进行预氧化;
S3、将冷却后的混合物浸入质量比为11%的氢氧化钠溶液,超声45min,将于混合均匀,浸渍4h,然后将固体混合物取出后干燥,然后置于马弗炉中进行活化处理,在氮气气氛中以4℃/min的升温速率升温至370℃,恒温2h,冷却后得改性活性半焦-硅藻土填料3,改性活性半焦-硅藻土填料3比表面积为391m2/g,孔容为0.19cm3/g,所形成的孔主要由中微孔构成,对焦化反渗透浓水中的有机物有非常强的吸附能力。
改性氧化铝填料6的制备方法如下:
S1、将对氟离子的饱和吸附量为6.8mg/g的氧化铝、钢渣和蛭石按照质量比9:3:1混合,机械搅拌30min,搅拌速度为55r/min,形成固体混合物;
S2、固体混合物后的放入0.5%聚硅酸钠溶液中,浸泡170min;
S3、将固体混合物过滤,晾干,放入马弗炉中,马弗炉以5℃/min的升温速率升温至355℃,恒温3h,然后冷却至室温,得到改性氧化铝填料6,改性氧化铝填料6对氟离子吸附饱和量为12.5mg/g。
实施例2
如图1所示,本发明提供一种技术方案:一种焦化反渗透浓水零排放工艺,包括一级进水泵1、有机物吸附塔2、二级进水泵4、除氟吸附塔5、三级进水泵7和蒸发结晶系统8,一级进水泵1的输出端与有机物吸附塔2的输入端相连接,二级进水泵4的输入端和输出端分别与有机物吸附塔2的输出端和除氟吸附塔5的输入端相连接,三级进水泵7的输入端和输出端分别与除氟吸附塔5的输出端和蒸发结晶系统8的输入端相连接,有机物吸附塔2的内部填充有改性活性半焦-硅藻土填料3,改性活性半焦-硅藻土填料3占整个有机物吸附塔2的85-95%,除氟吸附塔5的内部填充有改性氧化铝填料6,改性氧化铝填料6占整个除氟吸附塔5的85%;
一级进水泵1将TOC为14mg/L,氟离子为25mg/L,电导率为87670μs/cm的焦化反渗透浓水泵入到有机物吸附塔2中,并在有机物吸附塔2中停留50min,经过有机物吸附塔2后,焦化反渗透浓水中的TOC为4mg/L;
然后,经过有机物吸附塔2的焦化反渗透浓水通过二级进水泵4进入到除氟吸附塔5中,并在除氟吸附塔5中停留25min,经过除氟吸附塔5后,焦化反渗透浓水中氟离子为8mg/L;
随后,经过除氟吸附塔5的焦化反渗透浓水通过三级进水泵7进入到蒸发结晶系统8中,蒸发后得到纯度在99.5%的氯化钠。
改性活性半焦-硅藻土填料3的制备方法如下:
S1、将活性半焦和硅藻土按照质量比5:1混合,机械搅拌35min,搅拌速度为40r/min,形成固体混合物;
S2、将所得固体混合物以2℃/min的升温速率从室温升至220℃,恒温1.5h进行预氧化;
S3、将冷却后的混合物浸入质量比为8%的氢氧化钠溶液,超声45min,将于混合均匀,浸渍3h,然后将固体混合物取出后干燥,然后置于马弗炉中进行活化处理,在氮气气氛中以3℃/min的升温速率升温至330℃,恒温1h,冷却后得改性活性半焦-硅藻土填料3,改性活性半焦-硅藻土填料3比表面积为336m2/g,孔容为0.17cm3/g,所形成的孔主要由中微孔构成,对焦化反渗透浓水中的有机物有非常强的吸附能力。
改性氧化铝填料6的制备方法如下:
S1、将对氟离子的饱和吸附量为5.5mg/g的氧化铝、钢渣和蛭石按照质量比7:3:1混合,机械搅拌25min,搅拌速度为50r/min,形成固体混合物;
S2、固体混合物后的放入0.2%聚硅酸钠溶液中,浸泡130min;
S3、将固体混合物过滤,晾干,放入马弗炉中,马弗炉以5℃/min的升温速率升温至335℃,恒温2-3h,然后冷却至室温,得到改性氧化铝填料6,改性氧化铝填料6对氟离子吸附饱和量为10.3mg/g。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (5)
1.一种焦化反渗透浓水零排放工艺,包括一级进水泵(1)、有机物吸附塔(2)、二级进水泵(4)、除氟吸附塔(5)、三级进水泵(7)和蒸发结晶系统(8),其特征在于:所述一级进水泵(1)的输出端与有机物吸附塔(2)的输入端相连接,所述二级进水泵(4)的输入端和输出端分别与有机物吸附塔(2)的输出端和除氟吸附塔(5)的输入端相连接,所述三级进水泵(7)的输入端和输出端分别与除氟吸附塔(5)的输出端和蒸发结晶系统(8)的输入端相连接,所述有机物吸附塔(2)的内部填充有改性活性半焦-硅藻土填料(3),所述除氟吸附塔(5)的内部填充有改性氧化铝填料(6);
所述一级进水泵(1)将TOC为6-21mg/L,氟离子为23-35mg/L,电导率为82450-93780μs/cm的焦化反渗透浓水泵入到有机物吸附塔(2)中,并在有机物吸附塔(2)中停留45-60min,经过有机物吸附塔(2)后,焦化反渗透浓水中的TOC为2-7mg/L;
然后,经过有机物吸附塔(2)的焦化反渗透浓水通过二级进水泵(4)进入到除氟吸附塔(5)中,并在除氟吸附塔(5)中停留25-45min,经过除氟吸附塔(5)后,焦化反渗透浓水中氟离子为7-13mg/L;
随后,经过除氟吸附塔(5)的焦化反渗透浓水通过三级进水泵(7)进入到蒸发结晶系统(8)中,蒸发后得到纯度在99.2%以上的氯化钠;
所述改性活性半焦-硅藻土填料(3)的制备方法如下:
S1、将活性半焦和硅藻土按照质量比3-7:1混合,机械搅拌32-45min,搅拌速度为35-55r/min,形成固体混合物;
S2、将所得固体混合物以2-4℃/min的升温速率从室温升至215-245℃,恒温1.5-2.5h进行预氧化;
S3、将冷却后的混合物浸入质量比为7-11%的氢氧化钠溶液,超声45-55min,将于混合均匀,浸渍3-4h,然后将固体混合物取出后干燥,然后置于马弗炉中进行活化处理,在氮气气氛中以3-4℃/min的升温速率升温至320-370℃,恒温1-2h,冷却后得改性活性半焦-硅藻土填料(3);
所述改性氧化铝填料(6)的制备方法如下:
S1、将对氟离子的饱和吸附量为5.1-6.8mg/g的氧化铝、钢渣和蛭石按照质量比6-9:3:1混合,机械搅拌20-30min,搅拌速度为35-55r/min,形成固体混合物;
S2、固体混合物后的放入0.2-0.5%聚硅酸钠溶液中,浸泡120-180min;
S3、将固体混合物过滤,晾干,放入马弗炉中,马弗炉以5℃/min的升温速率升温至320-360℃,恒温2-3h,然后冷却至室温,得到改性氧化铝填料(6)。
2.根据权利要求1所述的一种焦化反渗透浓水零排放工艺,其特征在于:所述改性活性半焦-硅藻土填料(3)占整个有机物吸附塔(2)的85-95%。
3.根据权利要求1所述的一种焦化反渗透浓水零排放工艺,其特征在于:所述改性活性半焦-硅藻土填料(3)比表面积为313-415m2/g,孔容为0.13-0.24cm3/g,所形成的孔主要由中微孔构成。
4.根据权利要求1所述的一种焦化反渗透浓水零排放工艺,其特征在于:所述改性氧化铝填料(6)占整个除氟吸附塔(5)的85-95%。
5.根据权利要求1所述的一种焦化反渗透浓水零排放工艺,其特征在于:所述改性氧化铝填料(6)对氟离子吸附饱和量为9.2-13.4mg/g。
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