CN101790411A - 使用脉冲气提泵的膜清洗 - Google Patents

使用脉冲气提泵的膜清洗 Download PDF

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CN101790411A
CN101790411A CN200880017403A CN200880017403A CN101790411A CN 101790411 A CN101790411 A CN 101790411A CN 200880017403 A CN200880017403 A CN 200880017403A CN 200880017403 A CN200880017403 A CN 200880017403A CN 101790411 A CN101790411 A CN 101790411A
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membrane module
fluid
pulse
membrane
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CN101790411B (zh
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查富芳
G·贾梅斯
J·E·朱巴克
P·昭纳
R·W·费尔普斯
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Siemens Water Treatment Technology Co ltd
Evoqua Water Technologies LLC
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Priority to CN201610544266.1A priority Critical patent/CN106040002B/zh
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Priority to CN201811067045.5A priority patent/CN109107392A/zh
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Abstract

用流体流清洗浸没在液体介质中的膜表面的方法,包括沿该膜表面提供无规产生的间歇或脉冲流体流以从中去除污垢材料的步骤。还公开了膜组件,包括多个多孔膜(6)或一组膜组件(5)和用于提供无规产生的脉冲流体流以使得在使用时所述流体流移动通过所述膜(6)的表面以从中去除污垢材料的装置(11)。

Description

使用脉冲气提泵的膜清洗
技术领域
本发明涉及膜过滤系统,更特别地涉及用于使用脉冲流体流有效清洗该系统中所用的膜的装置和相关方法。
发明背景
用于处理废水的膜的重要性正迅速提高。现在公知膜工艺可以用作污水的有效三级处理并提供有质量的流出物。然而,该资金和运行成本能够是昂贵的。达到其中该膜组件浸没在大给水箱中并将滤液通过施加在该膜的滤液侧的抽吸力或通过重力给料收集的浸没膜工艺,在一个阶段中结合生物和物理工艺的膜生物反应器断定是更紧凑、有效和经济的。由于其多功能性,膜生物反应器的尺寸的范围能够从家用的(例如化粪池系统)到社会的和大规模污水处理。
膜过滤工艺的成功大大取决于使用有效且有效率的膜清洗方法。通常使用的物理清洗方法包括使用渗透液和气体或其组合反洗(反冲、反冲洗)、使用以在液体中的气泡形式的气体的膜表面清洗和冲洗。通常地,在气体冲洗系统中,将气体喷射(通常使用鼓风机)到其中浸没膜组件的液体系统中以形成气泡。然后将如此形成的气泡向上传动以冲洗该膜表面,以除去在该膜表面上形成的污垢物质。产生的剪切力大大取决于初始气泡速度、气泡直径和施加到该气泡上的力的结果。为了提高清洗效果,必须供给更多的气体。然而,该方法消耗大量的能量。而且,在高固体浓度环境中,该气体分布系统可能逐渐被脱水固体堵塞和仅在气流意外停止时堵塞。
此外,在高固体浓度的环境中,在其中清洁的滤液通过膜且保留更高固含量渗余物的过滤过程中,接近该膜表面的固体浓差极化变得显著,导致升高的膜阻力。通过使用用于清洗该膜的两相流已经解决了这些问题中的一些。
要求保护在循环基础上提供气泡的循环充气系统,以降低能量消耗,同时仍提供足够的气体以有效冲洗该膜表面。为了提供用于这种循环操作,这种系统通常需要复杂的阀门设置和控制系统,其容易提高所需的初始系统成本和该复杂阀门和开关设置的后续维护成本。应用于大系统中的机械阀也限制了循环频率。而且,已经发现循环充气不能有效更新该膜表面。
将会需要提供不需要使用复杂阀门开关等控制操作的能量有效的冲洗工艺操作。还优选提供通过该膜表面的两相液气流以提供更有效的冲洗工艺,同时使这种清洗工艺所需的能量最小化。
发明内容
本发明至少在其实施方案中寻求克服或至少改进现有技术的一些缺点或至少为公众提供有用的替代方式。
依照一个方面,本发明提供了用流体流清洗浸没在液体介质中的膜表面的方法,包括沿该膜表面提供无规产生的间歇或脉冲流体流以从中去除污垢材料并降低固体浓差极化的步骤。优选,该流体流包括气流。优选地,该气流是气泡形式。进一步优选,该流体流包括两相气/液流。优选地,该方法包括使用供给加压气流的装置产生脉冲两相气/液流。进一步优选,该加压气流的供给是基本恒定的。优选地,该脉冲流体流的大小和/或频率和/或持续时间是任意的。
在本发明的一种形式中,将该脉冲两相气/液流与基本恒定的两相气/液流结合使用。
任选地,可以使用鼓风机等装置在所述液体介质中提供另外的气泡源。所用的气体可以包括空气、氧气、氯气、臭氧、氮气、甲烷或任何其他适用于特定应用的气体。为了冲洗和/或充气的目的,空气是最经济的。氯气可以用于通过在膜表面处的化学反应洗涤、消毒和提高清洗效率。臭氧的使用除了与氯气上面体积的类似作用之外,还具有其他特征,例如将DBP前体氧化并将不可生物降解的NOM转化为可生物降解的溶解有机碳。在一些应用中,例如其中不适用氧气或氧化剂的厌氧生物环境或非生物环境,可以使用氮气,特别是在给料罐封闭能够使氮气保存并再循环的情况下。
依照第二方面,本发明提供了膜组件,包括多个多孔膜或一组膜组件,和用于提供无规产生的脉冲流体流以使得在使用时所述流体流移动通过所述膜的表面以从中去除污垢材料的装置。优选,该流体流包括产生运动通过所述膜表面的气泡的气流。进一步优选,该流体流包括两相气/液流。优选地,所述脉冲两相气/液流是由所述具有气体供给的装置产生的。优选地,该脉冲气流的大小和/或频率和/或持续时间是任意的。
在使用一组膜组件的情况下,该组件通常装配位于包含给料的容器或罐中的阵列、支架或盒子中。为了清洗一支架或一盒膜组件,该用于提供该脉冲气体或两相气/液流的装置可以与分布器连接,产生的脉冲气泡通过该分布器分布到该组件中。优选将一种装置设置到一个组件或少数组件中。因此,通常对一个支架或盒子安装有多个装置。优选将气体供给该支架并然后沿该支架,总管分布到各装置中。尽管将该气体以连续方式供给到各个装置中,但任何时候产生气泡从该装置沿该支架的喷发,保持不稳定条件下该膜罐给料基本恒定。这种作用降低了固体浓差极化并因此降低了过滤阻力。当从支架顶部向下看时,气泡从该支架内的不同组件中任意出现,形成无规的分布形式。
甚至在供给该支架的气体连续且在相同流速下的情况下,流动到各个组件的气流体积通常在小范围内波动,通常小于15%。这是由于脉冲气提装置内反压力的变化而致。
优选,该膜包括多孔中心纤维,该纤维的各端固定在集水管中,该下集水管在其中形成有一个或多个孔,通过该孔引入两相气/液流。该孔可以是圆形、椭圆形或狭槽形式。该纤维通常一端(通常是下端)密封,且另一端敞开以可以除去滤液,然而,在一些设置中,该纤维可以两端敞开以从一端或两端除去滤液。该纤维的密封端可以在封装在封装头终(potting head)或可以保持未封装。该纤维优选设置在垫子、圆柱形阵列或束中。应当认识到所述的清洗工艺同样可应用于其他形式的膜,例如平坦或平板膜。
进一步优选,该膜包括多孔中空纤维,该纤维的各端固定在集水管中以形成子组件。将一组子组件组装以形成组件。在子组件之间,保留一个或多个孔以允许气/液通过或分布到该子组件中。
依照一种优选形式,本发明提供了从多个多孔中空纤维膜的表面去除污垢材料的方法,该多个多孔中空纤维膜安装并纵向延伸在阵列中以形成膜组件,所述膜被彼此紧密邻近设置并安装以防止其间的过度运动,该方法包括提供通过所述膜表面的通常无规产生的均匀分布的脉冲气泡流的步骤,所述分布使得所述气泡在所述阵列中的各膜之间基本均匀流动以冲洗所述膜的表面并从该膜组件内去除累积的固体。
优选,气泡流进一步包括两相气/液流。优选地,所述脉冲两相气/液流是由具有基本恒定气体供给的装置提供的。优选地,该脉冲气流的大小和/或频率和/或持续时间是任意的。
依照第三方面,本发明提供了膜组件,包括多个多孔中空纤维膜,所述纤维膜被彼此紧密邻近设置并安装以防止其间的过度运动,该纤维膜的各端固定在集水管中,还包括一个在其中具有一个或多个开孔的集水管,通过该开孔引入通常无规的脉冲气流,用于清洗所述中空纤维膜的表面。
优选,该流体流包括气流。进一步优选,该气流是气泡形式。优选,气流包括两相气/液流。优选地,所述脉冲两相气/液流是由具有基本恒定的气体供给的装置产生的。优选地,该脉冲流体流的大小和/或频率和/或持续时间是任意的。
优选地,该装置包括响应于来自与其连接的气体源的所述加压气体供给操作的气提泵装置,用于储存和间歇释放加压气体,并使用该释放的气体以气提来自液体储罐的所述液体以产生所述脉冲两相气/液流。
优选,所述气提泵装置包括用于储存由所述气体源提供的所述气体并具有位于所述液体储罐内的上封闭端和下开口端的倒置气体储存腔、具有与所述液体储罐流体连通的入口端和与所述膜组件流体连通的出口端的垂直提升管,所述提升管具有与所述气体储存腔流体连通的开孔,设置用于在该腔中的气体含量达到预设含量时接收所述储存来自所述腔的气体并将该液体气提通过所述提升管用于排放到所述组件中。优选地,该垂直提升管位于该气体储存腔中。
在本发明的一种实施方案中,该气体供给是由包含加压气体的外部罐提供的,该罐与该膜组件流体连通,并具有用于提供气体的无规产生脉冲以形成用于清洗该膜表面的气泡流的控制装置。在一种实施方案中,该控制装置可以包括位于该膜组件的气/液入口中且可根据入口中的液面操作以从该外部罐中提供气体的流体流量控制装置。例如,可以使用浮筒装置以根据液面激活该控制装置。
优选地,可以保护该纤维,并用具有适当间隔的垂直和水平元件的组件支撑筛网限制纤维移动,以提供通过该纤维的自由流体和气体流动,并限制纤维的运动幅度,降低该纤维的封装头处的能量浓度。
优选,可以将该组件封装在基本为实心的或液/气不透性管中,并与该脉冲气提泵装置连接,以将该两相气/液流保留在该组件中。
作为参考,所述开孔包括一个或多个狭槽或一行孔。优选地,该纤维束位于该多个狭槽或孔行之间的封装头中。
可以将所用的液体供给该膜组件。
作为参考,该无规产生的脉冲的脉冲频率在通常为0.1~200秒的范围内变化。需要理解,该脉冲频率与该装置的结构相关,使用特定的结构,该脉冲频率优选在约10~约300%范围内变化。
优选地,该脉冲气提泵装置可以任选地与流体分布器流体连通连接以将该脉冲气泡基本均匀分布到该组件中。
优选地,该组件内的纤维具有约5~约80%,更优选地约8~约55%的组装密度(如上所限定)。
优选,所述孔具有在约1~40mm范围内,更优选地在约1.5~约25mm范围内的直径。在狭槽或一行孔的情况下,选择该开口区域与上述孔等效。
典型地,该纤维内径在约0.1mm~约5mm范围内,优选在约0.25mm~约2mm范围内。该纤维壁厚取决于所用的材料和与过滤效率相对所需的强度。典型地,壁厚为0.05~2mm,更通常为0.1mm~1mm。
依照另一方面,本发明提供了膜生物反应器,包括用于将给料引入其中的装置、用于在所述罐内形成活性污泥的装置、依照第三方面的位于所述罐内以浸渍在所述污泥中的膜组件,所述膜组件具有用于将滤液从所述膜的至少一端移除的装置。
依照另一方面,本发明提供了上面方面中所述类型的膜生物反应器的操作方法,包括:将给料引入所述罐;对所述纤维施加真空以从其中去除滤液,同时提供所述脉冲气流通过所述组件内的充气开孔,以使得在使用时所述气流运动通过所述膜纤维的表面以从中去除污垢材料。
如果需要,可以在该罐内提供进一步的充气源,用于有助于微生物活性。优选,该膜组件垂直悬浮在该罐内,且所述进一步的充气源可以提供在该悬挂组件附近。优选地,该进一步的充气源包括一组透气管。可以根据通量和给料条件使用或不使用反洗操作该膜组件。在该生物反应器中悬浮固体的高混合液体(5000~20000ppm)已经显示显著降低滞留时间并改进滤液质量。充气用于降解有机物质和膜清洗的组合应用已经显示能在不显著提高跨膜压力的情况下产生恒定的滤液流,同时确定高浓度的MLSS。
依照另一方面,本发明提供了水处理系统,包括罐、与该罐流体连接的液体腔、与该液体腔流体连接的气体腔、和与该气体腔流体连接的膜组件。
优选地,该水处理系统包括与该液体腔连接的抽吸侧和与该气体腔连接的排放侧的气体转移系统。优选,气体源流体连接该液体腔。优选地,该系统包括包含该膜组件的膜组件容器,该膜组件容器与该罐水力连接。
依照另一方面,本发明提供了水处理系统,包括与水源流体连接的液体储罐、包含第一隔室和第二隔室的气/液腔,第一隔室与该液体储罐流体连接,膜分离容器与该第二容器水力连接。
优选,该系统包括与该膜组件水力隔离的腔室和与该腔室连接的气体源。
优选地,该膜组件浸没在膜罐中容纳的混合液体中,该膜罐与流体连接该腔室的该充气区域水力连接。
依照另一方面,本发明提供了冲洗膜组件的方法,包括:提供具有第一隔室和第二隔室的腔室;在该第一隔室和该膜组件之间建立水力密封;用液体给料至少部分填充该第一隔室和将气体引入该腔室中。
优选地,该方法包括破坏该水力密封,其中对该水力密封的破坏将该腔室内包含的至少一部分气体释放到该膜组件,以及然后在该第一隔室和该膜组件之间再次建立该水力密封。
优选地,该方法包括对该水力密封再次破坏和再次建立,以产生该腔室内包含的至少一部分气体的脉冲释放。
优选地,该方法包括将液体给料引入该第二隔室中。在该方法的一种形式中,该将气体引入该腔室中是基本连续进行的。
依照另一方面,本发明提供了清洗位于包含液体的容器中的过滤膜的方法,通过在该容器内的多个位置处在该液体内提供通常无规的流体脉冲。优选地,该流体脉冲的大小和/或频率和/或持续时间是任意的。优选,该流体包括气体。进一步优选,该气体是气泡形式。优选,流体包括两相气/液混合物。优选地,所述脉冲两相气/液混合物是由具有基本恒定气体供给的装置产生的。
附图简述
现在将仅通过实施例的方式参照附图描述本发明的优选实施方案,其中:
图1是依照本发明的一种实施方案的膜组件的简要示意性横截面正视图;
图2显示了在脉冲活化阶段过程中的图1的组件;
图3显示了在完成脉冲两相气/液流体阶段之后图1的组件;
图4是依照本发明的第二实施方案的膜组件的简要示意性横截面正视图;
图5是依照本发明的第三实施方案的水处理系统的简要示意性横截面正视图;
图6是图1的实施方案中所示类型的膜组件的阵列的简要示意性横截面正视图;
图7A和7B是显示脉冲气提装置内的操作液面的膜组件的简要示意性横截面正视图;
图8是在图1的实施方案中所示类型的膜组件的简要示意性横截面正视图,显示了该脉冲气提泵中的污泥累积;
图9是显示该污泥去除工艺的一种实施方案的膜组件的简要示意性横截面正视图;
图10是脉冲液体流型和供给的空气流速随时间的图表;和
图11是对比使用气提装置和依照本发明的脉冲气提装置的清洗效率的膜渗透率随时间的图表。
优选实施方案的描述
参照附图,图1~3显示了依照本发明的一种实施方案的膜组件配置。
该膜组件5包括多个安装在下封装头7中并由其延伸的可渗透的中空纤维膜束6。在该实施方案中,将该膜束分隔开以在该膜束6之间提供空间8。需要理解,可以使用该组件内任意所需设置的膜。在该下封装头7中提供多个开口9以允许流体通过其从位于该下封装头7之下的分布腔10中流入。
脉冲气提泵装置11提供在该分布腔10之下并与其流体连通。该脉冲气提泵装置11包括下端13敞开并具有与其上端相邻的气体入口14的倒置气体收集腔12。中心提升管15延伸通过该气体收集腔12并与分布腔10的底部流体连接并在其下端16敞开。该提升管15在沿其长度的途中具有一个或多个开口17。管状槽18从提升管15在低于开口17的位置在周围和向上延伸。
在使用中,该组件5浸没在液体供给器19中,将加压气体源基本连续施加到气体入口14。该气体逐渐替代该倒置气体收集腔12内的给料液体19,直至其达到开口17的水平面。在该位置,如图2中所示,该气体冲破该开口17上的液体密封,并脉动通过该开口17并向上通过该中心提升管15,产生气泡和给料液体的脉冲,其流动通过分布腔10并进入该膜组件5的底部。该气体的快速脉动将液体抽吸通过该提升管15的底部开口16,产生高速的两相气/液流。然后该两相气/液流流动通过该开口9并冲洗该膜6的表面。该槽18防止该开口17的即刻再次密封并用于使该气/液混合物在最初脉冲之后短时间内连续流动。
该气体的最初脉动提供了液体转移的两个阶段:喷射和抽吸。当将该气泡气穴最初释放到提升管15中时发生该喷射阶段,产生强浮力将气体和液体快速喷射通过该提升管15并然后通过该膜组件5以对该膜表面产生有效的清洗作用。该喷射阶段之后是抽吸或虹吸阶段,其中气体快速流出该提升管15由于密度差产生临时的压力降,该密度差导致液体被抽吸通过该提升管15的底部16。因此,在该最初的快速两相气/液流之后降低液体流速,其也可以将另外的气体抽吸通过开口17。
然后用给料液体再次填充该气体收集腔12,如图3中所示,该工艺再次开始导致该组件5内的膜6的两相气/液清洗的另一个脉冲。由于该工艺的相对无控制性,该脉冲的频率和持续时间通常是任意的。
图4显示了图1~3的实施方案的另一种变型。在该实施方案中,提供了混合设置,其中除该脉冲两相气/液流之外,将稳态供给气体在端口20供给该提升管15的上部或下部,以产生由间歇脉冲两相气/液流补充的通过该组件5的恒定气/液流。
图5显示了关于图1~3的实施方案所述类型的组件35和泵装置11的阵列。该组件5位于给料罐36中。在操作中,由各泵装置11产生的气泡脉冲对各组件5无规发生,导致在该给料罐36内脉冲气泡产生的总体无规分布。这样在该给料罐36内产生恒定但无规或混乱变化的液体给料搅动。
图6显示了用于本发明的在使用膜生物反应器的水处理系统中的设置。在该实施方案中,在生物反应器罐21和膜罐22之间提供脉冲两相气液流。通过具有一个位于该生物反应罐21内的垂直延伸壁24和位于该膜罐22内的垂直延伸壁的倒置气体收集腔23。壁24在该生物反应罐21内延伸到比膜罐22内的壁25更低的深度。该气体收集罐23由该生物反应罐21和膜罐22之间的连接壁26分隔开,限定了两个隔室27和28。将气体(典型地为空气)通过端口29提供到该气体收集腔23。膜过滤组件或装置30位于在垂直壁25的下端之上的膜罐22内。
在使用中,在压力下将气体通过端口29提供给该气体收集腔23,导致腔室23内的水面降低直至其到达壁25的下端31。在该阶段,气体从隔室27中通过该壁25快速逃逸并作为气泡通过该膜罐22上升,产生通过该膜组件30的两相气/液流。该气体的脉冲也产生在气体收集腔23的隔室28内的气体的快速减少,导致另外的水从该生物反应罐21被虹吸到该膜罐22中。可以用与气体来源(未示出)连接的阀门(未示出)控制通过端口29的气流。可以用控制器装置(未示出)操作该阀门。
需要理解,上述实施方案中所述的脉冲流产生清洗装置可以使用具有多种已知膜构造,且并不限定于所示的特别设置。该装置可以与膜组件或组件的组合直接连接。将气体(典型地为空气)连续供给该装置,产生脉冲两相气/液流用于膜清洗和表面更新。通过该装置使用连续气体供给产生该脉冲流,然而,需要理解,在使用非连续气体供给时也可以产生脉冲流,但具有不同的脉冲形式。
在一些应用中,已经发现脉冲气提泵装置11内的液面在水平面A和B之间变化,如图7A和7B中所示。在该气提泵装置11内的顶端,典型地由于形成气窝而保留了液相不能达到的空间37。当这种泵装置11在高固态环境中(例如在膜生物反应器中)操作时,浮渣和/或脱水污泥39可能逐渐累积在该泵装置11的顶端处的空间37中,这样最终能够导致气流通道40的堵塞,导致降低的脉冲作用或毫无脉冲作用。图8显示了这种情景。
已经确认了用于克服该作用的几种方法。一种方法是将该气体注射点38定位于低于在操作过程中达到的上液面以下的位置,图7A和7B中的水平面A。当该液面到达该气提注射点38或以上时,该气提产生驱散在该泵装置11的顶端附近可能累积的浮渣或污泥的液体喷射41。图9示意性地显示了这种作用。该喷射41的强度与气体注射位置38和气体流速有关。该方法可以防止在该泵装置11内污泥的无规长期累积。
另一种方法是周期性排放该泵装置11内的气体以使该液面到达操作过程中泵装置11内的顶端空间37。在这种情况下,该气体的注射必须位于或接近该泵装置11内的最高点,使得可以排放所有或几乎所有该气窝37。图7中所示的气体连接点38是例子。根据该污泥质量,在不同频率下可以周期性进行该排放以防止在该泵装置内产生任意永久干燥的环境。
在泵装置11的操作中,同样需要注意,图7中的液面A可以根据气体流速改变。气体流速越高,在该泵装置11内的气窝形成也越少。因此,另一种可以使用的方法是在操作过程中将高得多的空气流周期性注射到该泵装置11内以驱散脱水污泥。根据该装置的涉及,用于该作用所需的气体流速比通常操作的气体流速高通常约30%或更高。在一些装置操作中可以通过将气体从其他膜罐转移到选定的罐中以临时产生短时间的高得多的气流以驱散脱水污泥。可替代地,可以周期性使用备用鼓风机(未示出)短时间供给更多的气流。
上述方法可以单独或以组合方式用于进行长期稳定操作并消除在该泵装置11内的任意浮渣/污泥累积。
实施例
一种典型的膜组件是由中空纤维膜组成的,具有1.6m的总长度和38m2的膜表面积。脉冲流产生装置与该典型的膜组件连接。桨轮流量计位于该提升管的下端处,以监控气体提升的脉冲液体流速。图10显示了在7.8Nm3/hr的恒定气体供给流速下该脉冲液体流速的瞬态图。该瞬态图显示了进入该组件的液体流速在高点和低点之间的无规或混乱型式。从低到高液体流速的频率在约1~4.5秒范围内。未测定释放到该组件的实际气体流速,因为其与液体混合,但预期该流型与该液流类似,以混乱形式在高点和低点范围内。
在膜生物反应器中进行通过脉冲和普通气提装置的膜清洗效果的比较。该膜过滤循环是12分钟过滤然后1分钟释放。在各空气流速下,测试两个重复循环。两组测试之间的唯一区别是与该组件连接的装置——普通气提装置与脉冲气提装置的对比。依照在过滤过程中的渗透率降低评价该膜清洗效率。图11显示了两种不同气提装置在不同空气流速下的渗透率图。从这些图中显而易见得出脉冲气提泵的膜污垢率较低,因为其提供了比普通气提泵更稳定的渗透率随时间变化。
在典型循环充气设置和本发明的脉冲气提充气的性能之间进行进一步的对比。脉冲气提的空气流速为3m3/h,循环充气为6m3/h。测试10s开/10s关和3s开/3s关的循环充气周期。选择10s开/10s关的循环充气以模仿大规模装置的实际操作,阀的最快开关为10s。选择3s开/3s关的循环充气以模仿在脉冲气提装置的操作范围内的频率。在约30LMH的正态流量下测试性能,且该性能包括30分钟的长过滤循环。
下表1总结了对脉冲气提操作和两种不同频率的循环充气操作的测试结果。与循环充气操作相比,在短过滤和长过滤循环过程中脉冲气提操作的渗透率显著少得多。尽管高频率循环充气略微改进了该膜的性能,但该脉冲气提操作保持稳定得多的渗透率,用脉冲气提设置确定了更有效的清洗工艺。表1空气冲洗方式对膜性能的影响
  操作模式   脉冲气提   10s开/10s关循环充气   3s开/3s关循环充气
  在12分钟速率过程中的膜渗透率降低   1.4~2.2lmh/巴   3.3~6lmh/巴   3.6lmh/巴
  在30分钟速率过程中的膜渗透率降低   2.5~4.8lmh/巴   10~12lmh/巴   7.6lmh/巴
上述实施例证实了具有脉冲流产生装置的有效膜清洗方法。将气提连续供给该脉冲流产生装置,产生无规或混乱的流型以有效清洗该膜。各循环流型的持续时间/效率、高和低流强度和流动变化形式彼此不同。在各循环内,该流动以混乱形式从一个数值到另一个数值连续变化。
需要理解,尽管上述实施方案使用脉冲气/液流,但本发明在使用包括气体、气泡和液体的其他任意脉冲流体流时也是有效的。
需要理解,在不脱离本发明所述的精神或范围的情况下,本发明的其他实施方案和实施例是可以的。

Claims (56)

1.用流体流清洗浸没在液体介质中的膜表面的方法,包括沿所述膜表面提供无规产生的间歇或脉冲流体流以从中去除污垢材料的步骤。
2.权利要求1的方法,其中所述流体流包括气流。
3.权利要求2的方法,其中所述气流包括气泡。
4.权利要求1的方法,其中所述流体流包括两相气/液流。
5.权利要求4的方法,其中所述方法包括使用供给加压气流的装置产生脉冲两相气/液流。
6.权利要求5的方法,其中所述加压气流是基本恒定的。
7.权利要求1的方法,其中所述方法进一步包括将所述脉冲两相气/液流与基本恒定的两相气/液流结合使用。
8.权利要求1的方法,其中所述方法进一步包括在所述液体介质中提供另外的气泡源。
9.权利要求1的方法,其中所述脉冲流体流的大小和/或频率和/或持续时间是任意的。
10.膜组件,包括多个多孔膜或一组膜组件,和用于提供通常无规产生的脉冲流体流以使得在使用时所述流体流移动通过所述膜的表面以从中去除污垢材料的装置。
11.权利要求10的膜组件,其中所述流体流包括气流。
12.权利要求11的膜组件,其中所述气流包括气泡。
13.权利要求11的膜组件,其中所述脉冲气流是由所述具有气体供给源的装置产生的。
14.权利要求10的膜组件,其中所述脉冲流体流包括两相气/液流。
15.权利要求10的膜组件,其中所述脉冲流体流的大小和/或频率和/或持续时间是任意的。
16.权利要求10的膜组件,其中所述用于提供所述脉冲流体流的装置进一步包括与所述装置流体连通的分布器,通过所述分布器将所述脉冲流体流分布到所述组件中。
17.权利要求10的膜组件,其中对各组件提供装置。
18.权利要求10的膜组件,其中对多个组件提供装置。
19.权利要求17或权利要求18的膜组件,其中所述脉冲流体流在所述装置中无规产生,形成无规的分布型式。
20.从多个多孔中空纤维膜的表面去除污垢材料的方法,所述多个多孔中空纤维膜安装并纵向延伸在阵列中以形成膜组件,所述膜被彼此紧密邻近设置并安装以防止其间的过度运动,所述方法包括提供通过所述膜表面的通常无规产生的均匀分布的脉冲气泡流的步骤,所述分布使得所述气泡在所述阵列中的各膜之间基本均匀流动以冲洗所述膜的表面并从所述膜组件内去除累积的固体。
21.权利要求20的从多个多孔中空纤维膜的表面去除污垢材料的方法,其中所述气泡流包括两相气/液流。
22.权利要求21的从多个多孔中空纤维膜的表面去除污垢材料的方法,其中所述脉冲两相气/液流是由具有基本恒定气体供给的装置产生的。
23.权利要求21或权利要求22的从多个多孔中空纤维膜的表面去除污垢材料的方法,其中所述脉冲气泡流的大小和/或频率和/或持续时间是任意的。
24.膜组件,包括多个多孔中空纤维膜,所述纤维膜被彼此紧密邻近设置并安装以防止其间的过度运动,所述纤维膜的各端固定在集水管中,还包括一个在其中具有一个或多个开孔的集水管,通过所述开孔引入通常无规的脉冲气流,用于清洗所述中空纤维膜的表面。
25.权利要求24的膜组件,其中所述脉冲气流是气泡的形式。
26.权利要求24或权利要求25的膜组件,其中所述脉冲气流包括两相气/液流。
27.权利要求26的膜组件,其中所述脉冲两相气/液流是由具有气体供给的装置产生的。
28.权利要求27的膜组件,其中所述气体供给是基本稳定的。
29.权利要求24或权利要求25的膜组件,其中所述脉冲气流的大小和/或频率和/或持续时间是任意的。
30.权利要求14或权利要求27的膜组件,其中所述装置包括响应于来自与其连接的气体源的所述加压气体供给操作的气提泵装置,用于储存和间歇释放加压气体,并使用所述释放的气体以气提大量来自液体储罐的所述液体以产生所述脉冲两相气/液流。
31.权利要求30的膜组件,其中所述气提泵装置包括用于储存由所述气体源提供的所述气体并具有位于所述液体储罐内的上封闭端和下开口端的倒置气体储存腔、位于所述气体储存腔内且具有与所述液体储罐流体连通的入口端和与所述膜组件流体连通的出口端的垂直提升管,所述提升管具有与所述气体储存腔流体连通的开口,其中所述气体储存腔被设置成用于在所述腔中的气体含量达到预设含量时接收来自所述腔的所述储存气体,并将所述液体气提通过所述提升管用于排放到所述组件中。
32.权利要求14或权利要求27的膜组件,其中所述气体供给是由包含加压气体的外部罐提供的,所述罐与所述膜组件流体连通,并具有用于提供气体的无规产生脉冲以形成用于清洗所述膜表面的气泡流的控制装置。
33.权利要求32的膜组件,其中所述控制装置包括位于所述膜组件的气/液入口中且可根据入口中的液面操作以从所述外部罐中提供气体的流体流量控制装置。
34.权利要求24的膜组件,其中所述装置与流体分布器流体连通连接以将所述脉冲气泡基本均匀分布到所述组件中。
35.膜生物反应器,包括用于将给料引入其中的装置、用于在所述罐内形成活性污泥的装置、依照权利要求24的位于所述罐内以浸渍在所述污泥中的膜组件,所述膜组件具有用于将滤液从所述膜的至少一端移除的装置。
36.权利要求35的膜生物反应器的操作方法,所述方法包括:将给料引入所述罐;对所述纤维施加真空以从其中去除滤液,同时提供所述脉冲气流通过所述组件内的充气开孔,以使得在使用时所述气流运动通过所述膜纤维的表面以从中去除污垢材料。
37.权利要求36的膜生物反应器的操作方法,进一步包括提供进一步的充气源,可以提供在所述罐内。
38.权利要求36的膜生物反应器的操作方法,其中所述膜组件垂直悬浮在所述罐内,且所述进一步的充气源提供在所述悬挂组件附近。
39.权利要求33的膜生物反应器的操作方法,其中所述进一步的充气源包括一组透气管。
40.水处理系统,包括罐、与所述罐流体连接的液体腔、与所述液体腔流体连接的气体腔、和与所述气体腔流体连接的膜组件。
41.权利要求40的水处理系统,进一步包括具有与所述液体腔连接的抽吸侧和与所述气体腔连接的排放侧的气体转移系统。
42.权利要求40或权利要求41的水处理系统,进一步包括与所述液体腔流体连接的气体源。
43.权利要求40的水处理系统,进一步包括包含所述膜组件的膜组件容器,所述膜组件容器与所述罐水力连接。
44.水处理系统,包括与水源流体连接的液体储罐、包含第一隔室和第二隔室的气/液腔,第一隔室与所述液体储罐流体连接,膜分离容器与所述第二容器水力连接。
45.权利要求44的水处理系统,进一步包括与所述膜组件水力隔离的腔室和与所述腔室连接的气体源。
46.权利要求44或权利要求45的水处理系统,其中所述膜组件浸没在膜罐中容纳的混合液体中,所述膜罐与流体连接所述腔室的所述充气区域水力连接。
47.冲洗膜组件的方法,包括:
提供具有第一隔室和第二隔室的腔室;
在所述第一隔室和所述膜组件之间建立水力密封;
用液体至少部分填充所述第一隔室;和
将气体引入所述腔室中。
48.权利要求47的冲洗膜组件的方法,其中所述方法进一步包括破坏所述水力密封,其中对所述水力密封的破坏将所述腔室内包含的至少一部分气体释放到所述膜组件,以及然后在所述第一隔室和所述膜组件之间再次建立所述水力密封。
49.权利要求47的冲洗膜组件的方法,其中所述方法进一步包括对所述水力密封再次破坏和再次建立,以产生所述腔室内包含的至少一部分气体的脉冲释放。
50.权利要求47的冲洗膜组件的方法,其中所述方法包括将液体引入所述第二隔室中。
51.权利要求47的冲洗膜组件的方法,其中所述将气体引入所述腔室中是基本连续进行的。
52.清洗位于包含液体的容器中的过滤膜的方法,通过在所述容器内的多个位置处在所述液体内提供通常无规的流体脉冲。
53.权利要求52的方法,其中所述流体脉冲的大小和/或频率和/或持续时间是任意的。
54.权利要求52的方法,其中所述流体包括气体。
55.权利要求54的方法,其中所述气体包括气泡。
56.权利要求52的方法,其中所述流体包括两相气/液混合物。
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