CN107720980A - 一种生物电化学耦合铝自建电场水处理系统 - Google Patents
一种生物电化学耦合铝自建电场水处理系统 Download PDFInfo
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Abstract
本发明提供了一种生物电化学耦合铝自建电场水处理系统,属于新能源与废水处理技术领域。本耦合系统在生物电化学技术基础之上,创新式引入微电解/电絮凝工艺,在处理工艺内设滴滤和空塔接触氧化床工艺,多工艺技术耦合既解决了高负荷污水处理出水水质不高及波动大的问题,又实现了电絮凝替代化学絮凝剂药剂添加,能够显著降低运行费用;微电机和生物电化学系统产电稳点且电池电动势较高,强化导电阴极膜污染介质的排斥作用,显著提升膜生物反应器运行周期和使用寿命;本耦合系统全部采用廉价原料制备,运行中无化学药剂引入,可实现高负荷污水的低成本处理,处理后的出水水质高且实现达标排放或回用,适用范围广,应用潜力大。
Description
技术领域
本发明属于新能源与废水处理技术领域,具体研发内容是利用单质铝作为生物电化学系统牺牲阳极,牺牲铝阳极与阳极室内填充活性炭因电位不同天然组成原电池和微电解的微阳极和微阴极,实现铝离子的自然释放;生物电化学系统自建的微电场触发阳极铝微电解实现电絮凝过程,对高负荷废水中有机质及无机质连续产生絮凝沉淀,达到高负荷废水净化处理。在本系统中,为强化系统生物降解效应,实现污染介质连续强化处理,在生物电化学系统阳极室后增设滴滤/空塔接触氧化床单元,内填充火山岩滤料,填料天然的多孔结构,好氧、兼性、厌氧微生物因溶解氧浓度的不同由外及内实现自然分布,对连续流废水可实现多元不同功能的处理,可显著提升耦合系统出水水质。
背景技术
微电解法因其操作简易,运行费用低、处理高负荷废水效果好等优点,是近年兴起的新型污水处理方法。该方法利用铝(或铁)等金属与碳颗粒在废水中形成数量众多的微原电池。铝/铁的电位低,作为微电解的微阳极;碳的电位高,作为微阴极。牺牲铝阳极与碳颗粒间充分接触,组成了一个大的原电池。该技术随今年的不断推广应用,已逐步走向成熟。在电镀废水、医药废水、煤化工废水、造纸废水等难处理工业废水领域,表现出良好的应用潜力和前景。
电絮凝法是在外加电场的情况下,采用具有絮凝特性的牺牲阳极,牺牲阳极释放的阳离子在废水中通过水解、聚合等反应形成多核羟基络合物,再通过吸附、混凝/絮凝、沉淀的作用实现污染物的去除。电絮凝过程中,阴极发生还原反应,不断产生微小氢气气泡,微气泡通过气浮作用将废水中胶体、悬浮物带到水面或悬浮水中,促进了电絮凝的充分反应性,从而使污染物得以去除。电絮凝技术作为一种工业化废水处理应用技术,在有色金属、冶炼行业、采选矿行业、电镀线路板等行业已实现了较为广泛的应用。
滴滤/空塔接触氧化床是利用天然石材火山岩的疏松多孔的表面结构,构筑的新型生物降解单元。连续流待处理废水经阳极出水滴滤充分溶氧后流经空气接触氧化床内部,氧化床内因溶解氧分布的不同,好氧、兼性、厌氧等不同微生物一体式并存床内部,多种微生物的联合作用,对有机质及氨氮的降解具有明显的促进作用。
本新型水处理系统同时将生物电化学系统与膜生物反应器进行耦合,充分发挥两者的协同作用机制,提高产电微生物生物质能利用效率,实现系统能源的有效利用。系统阴极采用双功能导电膜,既作为导电阴极,又作为膜生物反应器的过滤介质,实现两位一体设计。
本发明是利用铝片作为生物电化学系统的导电及生物阳极;同时铝片与阳极室内填充的碳颗粒形成原电池和微电解反应。生物电化学系统自生电场为阳极铝的电絮凝提供电场,无需外加动力。生物电化学系统自建电场触发的铝电解及絮凝过程反应温和,释放铝离子剂量均匀连续。系统内电解释放的水合铝离子与废水中的有机质、金属离子等实现聚合反应形成络合物,在耦合体系末端实现沉淀絮凝加以去除,实现废水的净化目的。本耦合系统全部采用廉价材料,运行费用低,对高负荷废水及金属废水具有显著处理效果,应用前景广泛。
发明内容
本发明的目的是提供一种生物电化学耦合铝自建电场水处理系统,解决了高负荷废水处理难的问题,同时系统具有低成本、高效率处理的优势,对高负荷废水具有全流程连续强化降解和净化作用。
本发明的技术方案:
一种生物电化学耦合铝自建电场水处理系统,设计步骤如下:
生物电化学系统的阳极室内电极为铝片,铝片顶端与数据采集系统相连;阳极室内填充活性炭及石墨混合颗粒,填充比为80%~100%;阳极室底部设置U型进水,顶部密封,原水经阳极室顶端多孔溢流槽下泄滴滤出水,阳极室内水力停留时间4-6h;阳极室滴滤出水经空塔接触氧化床同步实现气水交换和增氧过程;空塔接触氧化床填充天然多孔滤料,填充率大于90%;空塔接触氧化床单侧设置多孔板作为空气通道,实现天然多孔滤料由外至内氧气输送;
多介质仓设置在生物电化学系统的阳极室和阴极室间,替代质子交换膜;多介质仓下部设置质子通道,质子通道口预留法兰口及密封垫,法兰口四周内螺纹丝扣紧固无纺布,防止多介质仓向两侧的阳极室和阴极室泄漏;
生物电化学系统的阴极室一室双用,既作为耦合系统的生物阴极室,又作为内嵌工艺膜生物反应器的过滤室;阴极采用双功能导电过滤膜,既为耦合系统的阴极,同时作为膜生物反应器的过滤膜组件;所述的双功能导电过滤膜以碳纤维为基质,高分子材料为膜支撑层和过滤层,高分子材料中掺杂纳米还原单质铁,在制备过程中通过强氧化剂与单质铁的氧化还原反应在双功能导电过滤膜表面原位制备二氧化锰催化剂,提高系统阴极的氧还原速率;双功能导电过滤膜外联数据收集系统,阳极与阴极间外联电阻;
阴极室底部预留曝气头,补充溶氧维持溶解氧浓度在5mg/L以上;双功能导电过滤膜外接泵负压出水,在线压力表监测跨膜压差;阴极室内接种驯化污泥,底部预留排泥口。
本发明的有益效果:本耦合系统在生物电化学技术基础之上,创新式引入微电解/电絮凝工艺,在处理工艺内设滴滤和空塔接触氧化床工艺,多工艺技术耦合既解决了高负荷污水处理出水水质不高及波动大的问题,又实现了电絮凝替代化学絮凝剂药剂添加,能够显著降低运行费用;微电机和生物电化学系统产电稳点且电池电动势较高,强化导电阴极膜污染介质的排斥作用,显著提升膜生物反应器运行周期和使用寿命;本耦合系统全部采用廉价原料制备,运行中无化学药剂引入,可实现高负荷污水的低成本处理,处理后的出水水质高且实现达标排放或回用,适用范围广,应用潜力大。
附图说明
图1是COD脱除性能图。
图中:横坐标表示时间,单位d,纵坐标表示进出水浓度和去除效率,单位mg/L和%,圆点、菱形块分别表示COD进出水浓度,方块表示去除效率。
图2是氨氮脱除性能图。
图中:横坐标表示时间,单位d,纵坐标表示进出水浓度和去除效率,单位mg/L和%,圆点、菱形块分别表示氨氮进出水浓度,方块表示去除效率。
图3是总磷脱除性能图。
图中:横坐标表示时间,单位d,纵坐标表示进出水浓度和去除效率,单位mg/L和%,圆点、菱形块分别表示总磷进出水浓度,方块表示去除效率。
具体实施方式
以下结合技术方案和附图,详细叙述本发明的具体实施方式。
生物电化学系统阳极室:阳极室净尺寸为0.1×0.1×0.5m,底部Φ10进水管折流进水;阳极为废弃铝制易拉罐,去底内外打磨表面,用钛丝导线外连数据收集系统;室内内填充活性炭、石墨混合颗粒(粒径:3-5mm),填充率85%;室上部填料内插入232甘汞电极作为参比电极,电极与数据收集系统连接;室顶部与多孔溢流槽相连,内螺纹溢流孔孔径为Φ1,流量可调节。
空塔接触氧化床:氧化床净尺寸为0.06×0.1×0.25m;内填充天然火山岩填料,粒径为15-30mm;不同粒径火山岩混合均匀,填充比为100%;氧化床外壁预留Φ12(mm)空气输送孔。
多介质仓:多介质仓净尺寸为0.05×0.1×0.20m;内填充锰砂(粒径0.5-1mm)与活性炭(粒径0.5-1mm)混合填料,体积比为1:1;质子交换通道70×30mm,内丝无纺布封口。
生物电化学系统阴极室:应用铁/锰/氧催化剂导电膜为系统阴极,外接数据收集系统;导电膜为平板式,膜组件出水与出水泵相连,在线压力表监测跨膜压差;阴极室净尺寸为0.15×0.1×0.3m;低于预制曝气头补充溶氧,室内溶解氧控制在5mg/L以上;同时室底部预留排泥口,定期排放剩余污泥。
性能测试:生物电化学系统阳极室接种混合产电菌培养液。在系统驯化期间,配制高负荷人工废水进行低流速运行;空气接触氧化床生物膜挂膜成功后,进行系统过滤性能测试。实验结果如图1-3所示,说明系统对高负荷废水的净化处理有显著效果。
Claims (1)
1.一种生物电化学耦合铝自建电场水处理系统,其特征在于,
生物电化学系统的阳极室内电极为铝片,铝片顶端与数据采集系统相连;阳极室内填充活性炭及石墨混合颗粒,填充比为80%~100%;阳极室底部设置U型进水,顶部密封,原水经阳极室顶端多孔溢流槽下泄滴滤出水,阳极室内水力停留时间4-6h;阳极室滴滤出水经空塔接触氧化床同步实现气水交换和增氧过程;空塔接触氧化床填充天然多孔滤料,填充率大于90%;空塔接触氧化床单侧设置多孔板作为空气通道,实现天然多孔滤料由外至内氧气输送;
多介质仓设置在生物电化学系统的阳极室和阴极室间,替代质子交换膜;多介质仓下部设置质子通道,质子通道口预留法兰口及密封垫,法兰口四周内螺纹丝扣紧固无纺布,防止多介质仓向两侧的阳极室和阴极室泄漏;
生物电化学系统的阴极室一室双用,既作为耦合系统的生物阴极室,又作为内嵌工艺膜生物反应器的过滤室;阴极采用双功能导电过滤膜,既为耦合系统的阴极,同时作为膜生物反应器的过滤膜组件;所述的双功能导电过滤膜以碳纤维为基质,高分子材料为膜支撑层和过滤层,高分子材料中掺杂纳米还原单质铁,在制备过程中通过强氧化剂与单质铁的氧化还原反应在双功能导电过滤膜表面原位制备二氧化锰催化剂,提高系统阴极的氧还原速率;双功能导电过滤膜外联数据收集系统,阳极与阴极间外联电阻;
阴极室底部预留曝气头,补充溶氧维持溶解氧浓度在5mg/L以上;双功能导电过滤膜外接泵负压出水,在线压力表监测跨膜压差;阴极室内接种驯化污泥,底部预留排泥口。
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