CN103304009B - 一种利用间歇脉冲电絮凝技术处理苯酚废水的方法 - Google Patents

一种利用间歇脉冲电絮凝技术处理苯酚废水的方法 Download PDF

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CN103304009B
CN103304009B CN201310187246.XA CN201310187246A CN103304009B CN 103304009 B CN103304009 B CN 103304009B CN 201310187246 A CN201310187246 A CN 201310187246A CN 103304009 B CN103304009 B CN 103304009B
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CN103304009A (zh
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陆君
陆鸿飞
潘龙
李艳
马晓云
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Jiangsu Tongrui environmental protection technology development Limited by Share Ltd
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Abstract

本发明公开了一种利用间歇脉冲电絮凝技术处理苯酚废水的方法,首先调节苯酚废水pH值为4~7,电导率为500-2000us/cm;然后进行电絮凝处理:由单脉冲电源控制输出电流密度为2~15mA/cm2,极板间距为0.5~3cm,电解时间为15~60min,静沉时间30~45min;反应结束后进行离心处理,离心时间为5~15min。本发明的优点为脉冲电源的间歇供电模式使离子在本体溶液中得到了很好的扩散,提高了传质的效果,缓解了浓差极化进而在很大程度上克服了因电极钝化造成的处理效果差,浪费电能的缺点。同时脉冲电絮凝与直流电源相比较,减少了供电时间,降低了能耗。

Description

一种利用间歇脉冲电絮凝技术处理苯酚废水的方法
技术领域
本发明涉及一种苯酚废水的处理方法,更具体的说是涉及一种利用脉冲电絮凝间歇处理苯酚废水的方法。
背景技术
苯酚也称石碳酸,是一种高毒性物质,对人体组织有很强的腐蚀性,若排入水体后会造成不可估量的恶劣影响。目前,含苯酚的废水主要来源于焦化厂、石化厂、树脂厂、绝缘材料厂、香料厂、塑料厂等,这类废水因其自身的高毒性以及高COD等性能较难处理。传统的苯酚废水处理工艺有吸附法、活性污泥法、氧化法、萃取法等。吸附法存在解吸困难、解吸物的利用困难的问题;活性污泥法对运行管理的要求高,且产生大量的污泥,不易处理;氧化法和萃取法均需加入其它试剂,不经济且对环境产生二次污染。
电絮凝技术已广泛应用于电镀、造纸、皮革等工业废水的处理中。电絮凝法的设备简单,体积和占地面积小,无需添加试剂,产生的污泥量少,易于固化和脱水,絮体耐酸性好,稳定且易分离。采用电絮凝处理苯酚废水,有着极高的去除率,近年来该技术发展较为迅速,成为了学术和工业界较为关注的新型水处理技术。但目前主要存在的问题是能耗较高,并且在反应过程中易发生浓差极化而导致电极钝化,降低处理效率。
发明内容
发明目的:本发明的目的是提供一种能够降低浓差极化、防止电极钝化、降低能耗的利用脉冲电絮凝技术处理苯酚废水的方法。
技术方案:本发明所述的一种利用间歇脉冲电絮凝技术处理苯酚废水的方法,首先调节苯酚废水pH值为4~7,电导率为500-2000us/cm;然后进行电絮凝处理:由单脉冲电源控制输出电流密度为2~15mA/cm2,极板间距为0.5~3cm,电解时间为15~60min,静沉时间30~45min;反应结束后进行离心处理,离心时间为5~15min。
其中,所述电极为铁电极、铝电极或者铝铁电极组合使用。调节所述苯酚废水pH值为4.5~6.5,电导率为600-1500us/cm,单脉冲电源控制输出电流密度为3.5~10mA/cm2,极板间距为0.55~1cm,电解时间为30~50min。调节所述苯酚废水pH值为5,电导率为1000us/cm,单脉冲电源控制输出电流密度为4mA/cm2,极板间距为0.6cm,电解时间为35min。所述脉冲电源占空比为0.3~0.9,频率为0.5~2KHz,通电周期为0.5~0.9ms,断电周期为0.4~1ms。所述脉冲电源占空比为0.4,频率为1KHz,通电周期为0.6ms,断电周期为0.4ms。所述脉冲电源占空比为0.5,频率为1KHz,通电周期为0.7ms,断电周期为0.5ms。所述离心时间为10min。所述离心时间为13min。
有益效果:本发明与现有技术相比,其显著优点为脉冲电源的间歇供电模式为“通-断-通”,在该模式下电极表面的离子在“断”时得到很好的扩散,提高了传质的效果,缓解了浓差极化进而在很大程度上克服了因电极钝化造成的处理效果差、浪费电能的缺点。同时脉冲电源与直流电源相比较,减少了供电时间,降低了能耗。本方法的上述数据均是通过大量实验得出的,处理的废水苯酚去除率达到95%以上,且使用的设备简单,占地面积小,操作方便,产生的污泥量少,对环境无二次污染。
具体实施方式
实施例1:苯酚废水含量200mg/L,调节pH值为5,电导率为600us/cm,阴阳极采用铁电极,极板间距为0.6cm,平均电流密度为4.0mA/cm2,单脉冲电源占空比为0.4,频率为1KHz,通电周期为0.6ms,断电周期为0.4ms,电解时间为35min,静沉时间45min,离心时间15min,处理后的苯酚含量为6.2mg/L。
对比例:上述同样种类、浓度、pH值的废水,采用直流电源电解,处理后的苯酚含量为7.4mg/L,经过计算,功耗增大24.7%。
实施例2:苯酚废水含量200mg/L,调节pH值为6.5,电导率为1000us/cm,阴阳极采用铝电极,极板间距为1cm,平均电流密度为3.5mA/cm2,单脉冲电源占空比为0.8,频率为2KHz,通电周期为0.8ms,断电周期为0.6ms,电解时间为30min,静沉时间35min,离心时间15min,处理后的苯酚含量为5.6mg/L。
对比例:上述同样种类、浓度、pH值的废水,采用直流电源电解,处理后的苯酚含量为6.7mg/L,经过计算,功耗增大21%。
实施例3:苯酚废水含量200mg/L,调节pH值为4,电导率为2000us/cm,阳极采用铝电极,阴极采用铁电极,极板间距为0.5cm,平均电流密度为15mA/cm2,单脉冲电源占空比为0.3,频率为0.5KHz,通电周期为0.5ms,断电周期为0.4ms,电解时间为60min,静沉时间30min,离心时间13min,处理后的苯酚含量为4.8mg/L。
对比例:上述同样种类、浓度、pH值的废水,采用直流电源电解,处理后的苯酚含量为6.3mg/L,经过计算,功耗增大40.1%。
实施例4:苯酚废水含量200mg/L,调节pH值为7,电导率为500us/cm,阳极采用铝电极,阴极采用铁电极,极板间距为3cm,平均电流密度为2mA/cm2,单脉冲电源占空比为0.9,频率为2KHz,通电周期为0.9ms,断电周期为1ms,电解时间为15min,静沉时间30min,离心时间10min,处理后的苯酚含量为7.2mg/L。
对比例:上述同样种类、浓度、pH值的废水,采用直流电源电解,处理后的苯酚含量为9.2mg/L,经过计算,功耗增大16%。
实施例5:苯酚废水含量200mg/L,调节pH值为4.5,电导率为1500us/cm,阴阳极采用铁电极,极板间距为0.55cm,平均电流密度为10mA/cm2,单脉冲电源占空比为0.5,频率为1KHz,通电周期为0.7ms,断电周期为0.5ms,电解时间为50min,静沉时间30min,离心时间5min,处理后的苯酚含量为6.0mg/L。
对比例:上述同样种类、浓度、pH值的废水,采用直流电源电解,处理后的苯酚含量为7.6mg/L,经过计算,功耗增大34.6%。

Claims (7)

1.一种利用间歇脉冲电絮凝技术处理苯酚废水的方法,其特征在于:首先调节苯酚废水pH值为4或5-6.5,电导率为500-2000us/cm;然后进行电絮凝处理:由单脉冲电源控制输出电流密度,当阴阳电极均为铁时,电流密度为4-10mA/cm2,当阳电极为铝、阴电极为铁时,电流密度为2~15mA/cm2,当阴阳电极均为铝时,电流密度为3.5-15mA/cm2,极板间距为0.55-0.6或3cm,电解时间为15、35或50min,静沉时间30~45min;反应结束后进行离心处理,离心时间为5~15min,所述脉冲电源占空比为0.3~0.9,频率为0.5~2KHz,通电周期为0.5~0.9ms,断电周期为0.4~1ms。
2.根据权利要求1所述的处理苯酚废水的方法,其特征在于:调节所述电导率为600-1500us/cm,极板间距为0.55或0.6cm。
3.根据权利要求1所述处理苯酚废水的方法,其特征在于:调节所述苯酚废水pH值为5,电导率为1000us/cm。
4.根据权利要求1所述的处理苯酚废水的方法,其特征在于:所述脉冲电源占空比为0.4,频率为1KHz,通电周期为0.6ms,断电周期为0.4ms。
5.根据权利要求1所述的处理苯酚废水的方法,其特征在于:所述脉冲电源占空比为0.5,频率为1KHz,通电周期为0.7ms,断电周期为0.5ms。
6.根据权利要求1所述的处理苯酚废水的方法,其特征在于:所述离心时间为10min。
7.根据权利要求1所述的处理苯酚废水的方法,其特征在于:所述离心时间为13min。
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