CN113754047A - 一种硝化反硝化一体水处理系统 - Google Patents
一种硝化反硝化一体水处理系统 Download PDFInfo
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Abstract
本发明公开了一种硝化反硝化一体水处理系统,所述系统中包括氧还原电解槽和反硝化电解槽,养殖池内的水体经过滤后根据需要选择输入氧还原电解槽中进行硝化反应或输入反硝化电解槽中进行反硝化反应,之后再回流至养殖池内。此外,所述氧还原电解槽的出水还可先经过流式紫外消毒器后再回流至养殖池。本发明的系统完全不需要传统的生物滤池参与,可以避免水温对生物滤池系统的影响,同时可以高效实现氨氮的去除;此外所设置的反硝化电解槽可以降低水体系统中的硝酸盐浓度,避免了系统运行过程的换水操作。
Description
技术领域
本发明公开了一种硝化反硝化一体水处理系统,可以用于淡水循环水养殖系统中,属于水产养殖装备领域。
背景技术
在循环水养殖系统中,由于养殖对象的代谢产物、食物残渣等蛋白质不能及时分解,引起水体中氨氮和亚硝酸盐等快速积累,同时在循环水养殖系统中由于养殖密度较高且水体体积有限,这些因素会造成养殖水体迅速恶化,甚至会导致养殖对象大量死亡,引起巨大经济损失。由于氨氮和亚硝酸盐对养殖对象有很强的毒性,是目前水产养殖过程中重要的水体污染物。有研究表明,1kg鱼类每天可产生1.5g氨氮。资料表明鱼类长期对分子态氨的最高耐受限度为0.025mg/L。因此采用新的水处理技术来避免这些有害物质的积累和达到快速高效的去除效果具有十分重要的意义。
此外,循环水养殖系统中形成的硝酸盐能够造成水生动物体内携氧色素(如血红蛋白,血蓝蛋白)转化为不具有氧气输送功能的成分。除此之外,由硝酸盐形成的亚硝胺对哺乳动物而言是强力的致癌物,可引起消化系统相关的癌症。因此,世界卫生组织(WHO)限制饮用水中的硝酸盐含量不得超过10mg NO3 --N/L。而针对淡水养殖过程中可以接受的硝酸盐浓度应小于20mg NO3 --N/L。
目前,循环水养殖系统中氨氮的处理常采用生物膜法脱氮,该方法利用微生物(主要利用硝化细菌与反硝化细菌)将废水中的含氮物质逐步转化,最终将其转化为对鱼类危害低的硝酸盐或者无害的氮气排出系统。但是微生物的生长过程容易受到温度的影响,一旦温度降低,微生物活性减弱,导致水处理系统失效。而为了避免养殖系统中硝酸盐的积累,通常需要对循环水养殖水体进行换水处理,一般系统的日换水率达到15%左右,造成了大量的水资源浪费与环境富营养化。
发明内容
为了解决背景技术中存在的问题,本发明提供一种淡水循环水养殖系统中的硝化反硝化一体水处理系统。
本发明解决其技术问题所采用的技术方案是:
一种硝化反硝化一体水处理系统,包括氧还原电解槽和反硝化电解槽,养殖池内的水体经过滤后根据需要选择输入氧还原电解槽中进行硝化反应或输入反硝化电解槽中进行反硝化反应,之后再回流至养殖池内。
所述的氧还原电解槽的阴极是以钛网为骨架、以PTFE材料为疏水层、以碳黑为催化层所构成的三相电极;阳极是以钛板为基材、表面涂覆有PtO2-IrO2催化剂的电极,所述阴极阳极之间的间距为1.0-1.5cm。
进一步的,所述氧还原电解槽的出水先经过流式紫外消毒器后再回流至养殖池,且在所述的过流式紫外消毒器内设置螺旋式水路结构。
所述的氧还原电解槽的电流强度采用以下方式设置:
其中,n—产生每摩尔过氧化氢所转移的电子数量;m—鱼的生物量,g;ε—每天饲料的投喂率,%;a—每天的投喂次数,无量纲;θ—饲料中的蛋白质含量,%;0.102—单位饲料代谢产生氨氮的数值系数;t—饲料转化为氨氮所需时间,h;η—氧还原电解槽6的法拉第电解效率,%;I—氧还原电解槽6的电流强度,A;F—法拉第电解常数,C/mol;34—H2O2的摩尔质量,g/mol。
所述过流式紫外线消毒器的波段为200-250nm,辐照剂量不低于3000mJ/cm2。
所述的反硝化电解槽的阳极材料为Ti-RuO2,阴极材料为负载有纳米FeNi合金颗粒的多孔碳。
当养殖池中水体的硝酸盐浓度超过20mg/L时,将水体输入反硝化电解槽进行反硝化处理,当养殖池中水体的硝酸盐浓度低于5mg/L时,反硝化电解槽关闭停止工作;其余时间系统中的水体仅在氧还原电解槽中进行硝化反应。
与背景技术相比,本发明具有的有益效果是:
1)系统设置有电解反硝化电解槽,可定期实现硝酸盐的去除,避免了日常的换水操作;
2)采用阴极氧还原技术产生过氧化氢,结合紫外光催化技术,生成具有高度氧化活性的羟基自由基(·OH),无需任何耗材添加,可快速实现氨氮的降解;
3)取代了常规使用的生物滤池,缩短了系统的启动时间,同时可以不受水体温度的影响。
附图说明
图1为养殖系统中氮的转化过程示意图;
图2为本发明系统的一种具体实现结构示意图;
其中,1.养殖池 2.氨氮传感器 3.硝酸盐传感器 4.粗滤装置 5.精滤装置 6.第一电动阀门 7.第一流量计 8.氧还原电解槽 9.气泵 10.第一电源 11.过流式紫外线消毒器 12.第二电动阀门 13.第二流量计 14.反硝化电解槽 15.第二电源。
具体实施方式
下面结合附图和具体实例对本发明技术方案进行进一步的说明。
如图2所示,为本发明的一种硝化反硝化一体水处理系统的具体结构示意图;所述系统中包含养殖池1、置于养殖池内的氨氮浓度传感器2和硝酸盐浓度传感器3,养殖池1中的水体经粗滤装置4和精滤装置5后分为两部分,一部分水体经第一电动阀门6、第一流量计7后进入氧还原电解槽8,气泵9为氧还原电解槽8阴极侧提供氧气,第一电源10为氧还原电解槽8进行供电,然后氧还原电解槽8出水经过流式紫外消毒器11回流至养殖池1。另一部分水体经第二电动阀门12、第二流量计13后进入反硝化电解槽14后回流至养殖池1,同时,第二电源15为反硝化电解槽14进行供电。
系统正常运行时,第一电动阀门6开启,第二电动阀门12关闭,系统中的水体仅在氧还原电解槽中进行硝化反应;当养殖池中的硝酸盐浓度超过20mg/L时,第二电动阀门12打开,反硝化电解槽14开始工作,当养殖池中的硝酸盐浓度低于5mg/L时,第二电动阀门12关闭。
其中,氧还原电解槽的的阴极采用以钛网为骨架、以PTFE材料为疏水层、以碳黑为催化层所构成的三维电极;阳极是以钛板为基材、表面涂覆有PtO2-IrO2催化剂的电极,所述阴极阳极之间的间距为1.0-1.5cm。所述的氧还原电解槽阴极具有更好的氧气选择性,且可促进阴极表面2e反应的发生,进而提高过氧化氢的发生效率;反硝化电解槽14阳极材料为Ti-RuO2,阴极材料为多孔碳,其中负载有纳米FeNi合金颗粒,该阴极材料稳定性高,且反应活性点位更多,有利于提高硝酸盐的转化效率。
在养殖过程中,随着鱼的生长,投喂量的增加,水体中氨氮的浓度势必增加,而根据鱼的养殖过程调节电流强度,进而调节过氧化氢的发生量,既可以避免电流强度过大引起的能源浪费,也可避免电流强度过小引起的处理效果不佳,实现养殖过程电流强度的动态调整。氧还原电解槽的电流强度采用以下方式设置:
其中,n—产生每摩尔过氧化氢所转移的电子数量;m—鱼的生物量,g;ε—每天饲料的投喂率,%;a—每天的投喂次数,无量纲;θ—饲料中的蛋白质含量,%;0.102—单位饲料代谢产生氨氮的数值系数;t—饲料转化为氨氮所需时间,h;η—氧还原电解槽6的法拉第电解效率,%;I—氧还原电解槽6的电流强度,A;F—法拉第电解常数,C/mol;34—H2O2的摩尔质量,g/mol。
氧还原电解槽的出水先经过流式紫外消毒器后再回流至养殖池,过流式紫外线消毒器11内部设置有螺旋式水路结构,可以增加水体与紫外线的接触时间,其最优波段为200-250nm,辐照剂量不低于3000mJ/cm2;氧还原电解槽8内产生的H2O2通过过流式紫外线消毒器11时产生大量羟基自由基(·OH),增强了氨氮的去除效果。
本发明采用氧还原电解槽替代了传统的生物滤池,可以避免水温对生物滤池系统的影响,同时可以高效实现氨氮的去除;此外所设置的反硝化电解槽可以降低水体系统中的硝酸盐浓度,避免了系统运行过程的换水操作。
Claims (8)
1.一种硝化反硝化一体水处理系统,包括养殖池,其特征在于,还包括氧还原电解槽和反硝化电解槽,养殖池内的水体经过滤后根据需要选择输入氧还原电解槽中进行硝化反应或输入反硝化电解槽中进行反硝化反应,之后再回流至养殖池内。
2.根据权利要求1所述的硝化反硝化一体水处理系统,其特征在于,所述的氧还原电解槽的阴极是以钛网为骨架、以PTFE材料为疏水层、以碳黑为催化层所构成的三维电极;阳极是以钛板为基材、表面涂覆有PtO2-IrO2催化剂的电极,所述阴极阳极之间的间距为1.0-1.5cm。
3.根据权利要求1所述的硝化反硝化一体水处理系统,其特征在于,所述氧还原电解槽的出水先经过流式紫外消毒器后再回流至养殖池。
4.根据权利要求3所述的硝化反硝化一体水处理系统,其特征在于,所述的过流式紫外消毒器内设置螺旋式水路结构。
6.根据权利要求3所述的硝化反硝化一体水处理系统,其特征在于,所述过流式紫外线消毒器的波段为200-250nm,辐照剂量不低于3000mJ/cm2。
7.根据权利要求1所述的硝化反硝化一体水处理系统,其特征在于,所述的反硝化电解槽的阳极材料为Ti-RuO2,阴极材料为负载有纳米FeNi合金颗粒的多孔碳。
8.根据权利要求1所述的硝化反硝化一体水处理系统,其特征在于,当养殖池中水体的硝酸盐浓度超过20mg/L时,将水体输入反硝化电解槽进行反硝化处理,当养殖池中水体的硝酸盐浓度低于5mg/L时,反硝化电解槽关闭停止工作;其余时间系统中的水体仅在氧还原电解槽中进行硝化反应。
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