CN112742345A - 一种改性硅藻土的废水除磷脱氮处理方法 - Google Patents
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Abstract
本发明提供一种改性硅藻土的废水除磷脱氮处理方法,步骤如下:1)将硅藻土加入硫酸溶液,进行第一步改性,然后再加入无水硫酸镁固体,搅拌均匀得半泥状潮湿改性硅藻土混合物;2)在步骤1)所得的改性硅藻土混合物中加入磷酸钠固体,对硅藻土进行第二步改性;3)将步骤2)第二步改性后的硅藻土,加入到污水处理生化处理段的曝气池或者曝气工艺段的出水口处,即可达到废水除磷脱氮的目的。本发明实现污水处理***氮、磷同时去除,从而显著降低污水厂排水(处理后废水)的氮磷含量,提高废水厂排放水水质。
Description
技术领域
本发明属于废水处理技术领域,具体涉及一种改性硅藻土的废水除磷脱氮处理方法。
技术背景
氮、磷污染是导致水体富营养化的重要因素。随着人们对水环境质量要求的不断提高,对污水处理厂的排放标准也就越来越高。要求现有城市污水处理厂二级出水水质要达到国家排放一级A的标准,但往往由于各种原因,目前污水处理厂排放的出水中仍残留有较高的氨氮和磷浓度,这些残留的氨氮、磷等营养成分排放的水中易引起水体富营养化而形成黑臭水体, 进而危害自然水体中的生态平衡。因此,排放水的总氮、总磷是水质重要的控制指标。
由于历史原因,我国的污水处理起步比较晚,污水处理工艺相对落后且从事污水处理行业的人员素质相对较低,当前国内污水处理领域普遍存在的排放标准不高,污水经过生化处理后排放的废水化学需氧量、生物耗氧量以及水中的营养成分氨氮、总磷含量相对偏高,目前国内亟需对一些老旧的废水处理设施进行提标改造,以进一步提高污水处理的质量。同时,如何设计一种污水高效的除磷脱氮处理方法,具有十分现实的重要意义。
发明内容
本发明的目的旨在提供一种改性硅藻土的废水除磷脱氮处理方法,充分利用硅藻土的物理吸附作用以及化学沉淀技术相结合,实现污水处理***氮、磷同时去除,从而显著降低污水厂排水(处理后废水)的氮磷含量,提高废水厂排放水水质。
为达到上述目的,本发明的改性硅藻土的废水除磷脱氮处理方法,步骤如下:
1)将硅藻土加入硫酸溶液或盐酸溶液,进行第一步改性,然后再加入无水硫酸镁固体,搅拌均匀得半泥状潮湿改性硅藻土混合物;
2)在步骤1)所得的改性硅藻土混合物中加入磷酸钠固体,对硅藻土进行第二步改性;
3)将步骤2)第二步改性后的硅藻土,加入到污水处理生化处理段的曝气池或者曝气工艺段的出水口处,即可达到废水除磷脱氮的目的。
优选地,所述步骤1)中,选用硫酸溶液进行第一步改性,硅藻土与硫酸溶液的质量比为:硅藻土:硫酸溶液=1:(0.05~0.15),所述硫酸溶液的浓度为2~5mo l/L。
优选地,所述步骤1)中,硅藻土与无水硫酸镁固体的质量比为:硅藻土:无水硫酸镁固体=1000:(50~250)。
优选地,所述步骤2)中,第二步改性中的硅藻土与磷酸钠固体的质量比为:硅藻土:磷酸钠固体=1000:(50~100)。
本发明的技术原理:
硅藻土是一种硅质岩石,主要分布在中国、美国、日本、丹麦、法国、罗马尼亚等国。是一种生物成因的硅质沉积岩,它主要由古代硅藻的遗骸所组成。其化学成分以SiO2为主。具有很强的吸附性能。
本发明采用改性硅藻土较强的选择性吸附,在改性过程中植入少量负三价磷酸根阴离子并减弱混合物的酸性;并利用硫酸镁的对氨氮、磷的沉淀作用去除排放水中的氨氮和磷;通过改性硅藻土中植入少量负三价磷酸根阴离子选择性吸附,一方面适当增加废水中的磷元素含量以满足氨氮的去除率(生活污水排放的废水中一般氨氮含量远高于磷的含量),一方面可以适当提高排放水的PH值,更利于形成鸟粪石沉淀所需的酸碱环境。通过过量的镁离子继续和排放水中的磷酸根、氨根发生化学反应生成沉淀被吸附到改性的硅藻土颗粒上形成大颗粒沉淀,这样通过化学沉淀去除排放废水中残留的少量氨氮和游离态的磷酸根离子。同时,通过多组实验表明,本技术可以在比较宽泛的PH值(5~10)范围的水环境中对除磷脱氮都有很好的去除效率,跟目前技术中要求的PH值(8左右)的水环境中有更好更广的适应性。
另,选择2~5mo l/L的硫酸溶液主要考虑到改性需要合适的水分,硫酸浓度过大会有水分不足与配制时反应过于激烈容易发生危险,优选低浓度硫酸溶液。硅藻土改性使用磷酸钠的量与废水中的总氨氮与总磷的质量比有关,本技术是按照城市污水的氨氮与总磷的比例范围来作为本技术的参考比配,其他废水的氨氮和总磷比例可以根据实际的需要添加磷酸钠,如果废水含磷量远远超过氨氮总量,硅藻土第一步可以使用硫酸铵;硅藻土的第二步改性可以使用别的强碱弱酸盐如碳酸钠、碳酸氢钠等。
试验应用表明,应用本发明之后,氨氮出水浓度均在20mg/L以下,其去除率范围为8 4.95%~94.77%,一般在89%以上;磷的出水浓度范围为0.57~3.85mg/L,一般在215mg/l以下,其去除率范围为67.66%~89.78%,多在8 0%以上。
本发明的实质性特点及显著进步是:
本发明的本发明能充分利用硅藻土的物理吸附作用、改性硅藻土吸附电位改变形成对氨氮、磷酸根的强选择性吸附原理、镁离子与磷酸根和氨根离子易形成鸟粪石沉淀的化学沉淀技术相结合,实现污水处理***氮、磷同时去除,从而显著降低污水厂排水(处理后出水)的氮磷含量,提高污水厂排放水水质,降低污水处理成本,操作简单,技术经济性好。
具体实施方式
下面通过具体实施例进一步说明本发明的技术方案。
本发明的改性硅藻土的废水除磷脱氮处理方法,步骤如下:
1)将硅藻土加入硫酸溶液,进行第一步改性,然后再加入无水硫酸镁固体,搅拌均匀得半泥状潮湿改性硅藻土混合物。
其中,硅藻土与硫酸溶液的质量比为:硅藻土:硫酸溶液=1:(0.05~0.15),所述硫酸溶液的浓度为2~5mo l/L。
其中,硅藻土与无水硫酸镁固体的质量比为:硅藻土:无水硫酸镁固体=1000:(50~250)。
2)在步骤1)所得的改性硅藻土混合物中加入磷酸钠固体,对硅藻土进行第二步改性。
其中,硅藻土与磷酸钠固体的质量比为:硅藻土:磷酸钠固体=1000:(50~100)。
3)将步骤2)第二步改性后的硅藻土,加入到污水处理生化处理段的曝气池或者曝气工艺段的出水口处,即可达到废水除磷脱氮的目的。
实施例1:
取4份污水厂处理后按一级B标准排放的废水,每份50000mL ,然后往其中加入经过不同药剂量改性过的硅藻土混合物,(改性药剂具体使用量如表1)并不断通入空气,以气动搅拌兼曝气2.5小时后静置,沉淀完全分布烧杯底部,取上层澄清液,比较各溶液的NH、N去除率如下表1:
表1
实施例2:
取4份污水厂处理好氧曝气池的废水,每份50000mL ,然后往其中加入经过不同药剂量改性过的硅藻土混合物,(改性药剂具体使用量如表2)并不断通入空气,以气动搅拌兼曝气2.5小时后静置,沉淀完全分布烧杯底部,取上层澄清液,比较各溶液的NH;-N去除率如下表2:
表2
结论:综上实验表明,本技术的最佳配比就是根据废水的氨氮总量和磷酸根的比例来选配,并不是投加镁离子、硫酸、磷酸钠越大而去除率越高,原因是改性硅藻土的硫酸越多,硅藻土的酸性越强,不利于沉淀形成,同时投加的磷酸钠越多,会造成磷酸根过剩而导致出水总磷含量偏高造成去除率低的假象,故本发明的最关键技术是在镁离子(元素)过剩的前提下,适当控制改性硅藻土硫酸的使用量,并根据废水的氨氮和磷的摩尔比来确定磷酸钠的投加量,倘若废水中的磷含量远高于氨氮,本发明并不适用。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何不经过创造性劳动想到的变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应该以权利要求书所限定的保护范围为准。
Claims (4)
1.一种改性硅藻土的废水除磷脱氮处理方法,其特征在于,步骤如下:
1)将硅藻土加入硫酸溶液或盐酸溶液,进行第一步改性,然后再加入无水硫酸镁固体,搅拌均匀得半泥状潮湿改性硅藻土混合物;
2)在步骤1)所得的改性硅藻土混合物中加入磷酸钠固体,对硅藻土进行第二步改性;
3)将步骤2)第二步改性后的硅藻土,加入到污水处理生化处理段的曝气池或者曝气工艺段的出水口处,即可达到废水除磷脱氮的目的。
2.根据权利要求1所述的改性硅藻土的废水除磷脱氮处理方法,其特征在于:所述步骤1)中,选用硫酸溶液进行第一步改性,硅藻土与硫酸溶液的质量比为:硅藻土:硫酸溶液=1:(0.05~0.15),所述硫酸溶液的浓度为2~5mo l/L。
3.根据权利要求1所述的改性硅藻土的废水除磷脱氮处理方法,其特征在于:所述步骤1)中,硅藻土与无水硫酸镁固体的质量比为:硅藻土:无水硫酸镁固体=1000:(50~250)。
4.根据权利要求1所述的改性硅藻土的废水除磷脱氮处理方法,其特征在于:所述步骤2)中,第二步改性中的硅藻土与磷酸钠固体的质量比为:硅藻土:磷酸钠固体=1000:(50~100)。
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