CN106032303A - 餐厨沼液处理方法及其处理装置 - Google Patents
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Abstract
本发明公开并提供了一种工艺流程简单、设备成本低、药剂投放量小以及处理效果稳定的餐厨沼液处理方法及其处理装置。其中餐厨沼液处理装置包括预处理部、MVR蒸发器、一级蒸汽净化器以及二级蒸汽净化器,所述预处理部与所述MVR蒸发器的进水端相连接,所述MVR蒸发器、所述一级蒸汽净化器以及所述二级蒸汽净化器依次相连接,所述二级蒸汽净化器与所述MVR蒸发器相连接,所述预处理部与外部沼液池相连接。本发明适用于餐厨沼液处理领域。
Description
技术领域
本发明涉及一种餐厨沼液处理方法及其处理装置。
背景技术
餐厨垃圾沼液是餐厨垃圾厌氧发酵后产生的一种具有高浓度有机物或无机物的废水。餐厨垃圾,俗称泔脚,是居民在生活消费过程中形成的生活废物,极易腐烂变质,散发恶臭,传播细菌和病毒。餐厨垃圾主要成分包括米和面粉类食物残余、蔬菜、动植物油、肉骨等,从化学组成上,有淀粉、纤维素、蛋白质、脂类和无机盐。餐厨垃圾采用厌氧发酵处理后,将产生大量的沼气,沼气是一种清洁能源,能用来焚烧发电,同时还将产生大量的沼液。餐厨垃圾沼液水质变化范围极大,有机污染物种类多、浓度高,且含有多种致癌物、促癌物、辅致癌物、致突变物和金属离子,对其进行处理的难度极大。
沼液是一种特殊性质的废水,氨氮较高, BOD较低,沼液COD在~之间,悬浮物较细小,悬浮物的浓度较高。沼液的因为经过厌氧产沼气过程,碳氮磷比例失衡,所以可生化性较差。一般方法无法处理达标排放。
发明内容
本发明所要解决的技术问题是克服现有技术的不足,提供一种工艺流程简单、设备成本低、药剂投放量小以及处理效果稳定的餐厨沼液处理方法及其处理装置。
本发明所采用的技术方案是:一种餐厨沼液处理装置,它包括预处理部、MVR蒸发器、一级蒸汽净化器以及二级蒸汽净化器,所述预处理部与所述MVR蒸发器的进水端相连接,所述MVR蒸发器、所述一级蒸汽净化器以及所述二级蒸汽净化器依次相连接,所述二级蒸汽净化器与所述MVR蒸发器相连接,所述预处理部与外部沼液池相连接。
所述预处理部包括依次相连接的混合器、沉淀池以及脱水机,所述混合器的进水口与外部沼液池相连接,所述沉淀池的出水口与所述MVR蒸发器的第一进水口相连接,所述沉淀池的出料口与所述脱水机的进料口相连接。
所述MVR蒸发器与所述一级蒸汽净化器之间设置有除沫器,所述MVR蒸发器的蒸汽出口通过所述除沫器与所述一级蒸汽净化器的进汽口相连接。
所述二级蒸汽净化器的出水口与所述MVR蒸发器的第二进水口相连接。
所述一级蒸汽净化器上设置有硫酸投放口。
所述二级蒸汽净化器上设置有氢氧化钠投放口。
一种通过上述的餐厨沼液处理装置来实现餐厨沼液处理的方法,它包括以下步骤:
A.将餐厨沼液进行预处理:
a.将餐厨沼液从沼液池引进所述混合器内,并往所述混合器内投放石灰乳,对沼液进行软化并调节其pH值,使沼液的pH值符合标准;
b.往调节完pH值的沼液内投放混凝剂,水中的微粒、悬浮物及胶体将会汇集成团,然后将混合液排进所述沉淀池进行沉淀并分别生成上清液以及固液混合物;
c.将步骤b中生成的固液混合物输送至所述脱水机内进行脱水,得到固体污泥,然后将固体污泥外运处理;
B.对上清液进行蒸发净化处理:
d.将步骤b中的上清液输送至所述MVR蒸发器进行压缩蒸发,继而生成混合蒸汽以及一次浓缩液,其中所述混合蒸汽输送至所述一级蒸汽净化器,所述一次浓缩液留在所述MVR蒸发器继续进行压缩蒸发,如此循环;
e.步骤d中生成的混合蒸汽输送至所述一级蒸汽净化器内,同时往所述一级蒸汽净化器内投放硫酸,使得混合蒸汽内的氨氮和硫酸反应,生成硫酸铵,所述硫酸铵装袋后外运处理;
f.步骤e中剩余的混合蒸汽输送至所述二级蒸汽净化器,同时往所述二级蒸汽净化器投放氢氧化钠,使得混合蒸汽中的有机物和氢氧化钠反应,生成有机钠盐与二次蒸汽,所述有机钠盐装袋外运处理,而所述二次蒸汽则被冷凝成蒸馏水回流至所述MVR蒸发器中;
g.所述MVR蒸发器内最终生成浓缩废液与蒸馏水,所述浓缩废液回灌填埋场,所述蒸馏水则能够达标排放。
在步骤d中,所述混合蒸汽先经过所述除沫器进行液沫分离后再进入所述一级蒸汽净化器内。
在步骤f中,投放的氢氧化钠与所述混合蒸汽中的有机物反应,用于消除混合蒸汽中的CODcr。
本发明的有益效果是:在本发明中,由于采用了混合器、沉淀池以及脱水机、MVR蒸发器、一级蒸汽净化器以及二级蒸汽净化器,所以使得本发明的成本相对较为低廉,同时工艺链相对较短,这就使得其工艺流程相对以往简单、工程周期相对以往简短,运行稳定;又由于依次采用了混合器、沉淀池以及脱水机来对餐厨沼液进行预处理,再通过MVR蒸发器、一级蒸汽净化器以及二级蒸汽净化器分别进行压缩蒸发以及二级蒸汽净化,所以相对于以往的物理化学法,本发明的药剂投放量少,这既免除了工作人员以及周围环境被化学药剂所影响,又节省了药剂成本,同时还保证了达标排放。
附图说明
图1是本发明中餐厨沼液处理装置的结构连接示意图。
具体实施方式
如图1所示,一种餐厨沼液处理装置,它包括预处理部、MVR蒸发器1、一级蒸汽净化器2以及二级蒸汽净化器3,所述预处理部与所述MVR蒸发器1的进水端相连接,所述MVR蒸发器1、所述一级蒸汽净化器2以及所述二级蒸汽净化器3依次相连接,所述二级蒸汽净化器3与所述MVR蒸发器1相连接,所述预处理部与外部沼液池相连接。
所述预处理部包括依次相连接的混合器4、沉淀池5以及脱水机6,所述混合器4的进水口与外部沼液池相连接,所述沉淀池5的出水口与所述MVR蒸发器1的第一进水口相连接,所述沉淀池5的出料口与所述脱水机6的进料口相连接。
所述MVR蒸发器1与所述一级蒸汽净化器2之间设置有除沫器7,所述MVR蒸发器1的蒸汽出口通过所述除沫器7与所述一级蒸汽净化器2的进汽口相连接。
所述二级蒸汽净化器3的出水口与所述MVR蒸发器1的第二进水口相连接。
所述一级蒸汽净化器2上设置有硫酸投放口。
所述二级蒸汽净化器3上设置有氢氧化钠投放口。
一种通过餐厨沼液处理装置来实现的餐厨沼液处理方法,它包括以下步骤:
A.将餐厨沼液进行预处理:
a.将餐厨沼液从沼液池引进所述混合器4内,并往所述混合器4内投放石灰乳,对沼液进行软化并调节其pH值,使沼液的pH值符合标准,在沼液中加入石灰乳去除进水中的钙镁,其目的是去除进水中含有的大量钙离子、镁离子,消除进水中的临时硬度,降低污堵在MVR蒸发***中发生。通过化学软化可以去除90%以上钙镁离子、50-60%左右的二氧化硅及绝大部分的氟离子,同时去除20%左右的COD有机物。
b.往调节完pH值的沼液内投放混凝剂,水中的微粒、悬浮物及胶体将会汇集成团,然后将混合液排进所述沉淀池5进行沉淀并分别生成上清液以及固液混合物;
c.将步骤b中生成的固液混合物输送至所述脱水机6内进行脱水,得到固体污泥,然后将固体污泥外运处理;
B.对上清液进行蒸发净化处理:
d.将步骤b中的上清液输送至所述MVR蒸发器1进行压缩蒸发,继而生成混合蒸汽以及一次浓缩液,其中所述混合蒸汽先经过所述除沫器7进行液沫分离后再被输送至所述一级蒸汽净化器2,所述一次浓缩液留在所述MVR蒸发器1继续进行压缩蒸发,如此循环;
e.步骤d中生成的混合蒸汽输送至所述一级蒸汽净化器2内,同时往所述一级蒸汽净化器2内投放硫酸,使得混合蒸汽内的氨氮和硫酸反应,使得99%以上的氨氮被去除并生成硫酸铵,所述硫酸铵装袋后外运处理,生成的部分蒸馏水达标排放,其中所述硫酸铵能够作为农作物的肥料使用;
f.步骤e中剩余的混合蒸汽输送至所述二级蒸汽净化器3,同时往所述二级蒸汽净化器3投放氢氧化钠,使得混合蒸汽中的有机物和氢氧化钠反应,使得90%以上的CODcr被去除,生成有机钠盐与二次蒸汽,所述有机钠盐装袋外运处理,而所述二次蒸汽则被冷凝成蒸馏水回流至所述MVR蒸发器1中;
g.所述MVR蒸发器1内最终生成10%的浓缩废液与90%的蒸馏水,所述浓缩废液回灌填埋场,所述蒸馏水则能够达标排放。
本具体实施例中所描述的MVR蒸发器是常规的机械式蒸汽再压缩技术蒸发器。
本发明适用于餐厨沼液处理领域。
Claims (9)
1.一种餐厨沼液处理装置,其特征在于:它包括预处理部、MVR蒸发器(1)、一级蒸汽净化器(2)以及二级蒸汽净化器(3),所述预处理部与所述MVR蒸发器(1)的进水端相连接,所述MVR蒸发器(1)、所述一级蒸汽净化器(2)以及所述二级蒸汽净化器(3)依次相连接,所述二级蒸汽净化器(3)与所述MVR蒸发器(1)相连接,所述预处理部与外部沼液池相连接。
2.根据权利要求1所述的餐厨沼液处理装置,其特征在于:所述预处理部包括依次相连接的混合器(4)、沉淀池(5)以及脱水机(6),所述混合器(4)的进水口与外部沼液池相连接,所述沉淀池(5)的出水口与所述MVR蒸发器(1)的第一进水口相连接,所述沉淀池(5)的出料口与所述脱水机(6)的进料口相连接。
3.根据权利要求2所述的餐厨沼液处理装置,其特征在于:所述MVR蒸发器(1)与所述一级蒸汽净化器(2)之间设置有除沫器(7),所述MVR蒸发器(1)的蒸汽出口通过所述除沫器(7)与所述一级蒸汽净化器(2)的进汽口相连接。
4.根据权利要求3所述的餐厨沼液处理装置,其特征在于:所述二级蒸汽净化器(3)的出水口与所述MVR蒸发器(1)的第二进水口相连接。
5.根据权利要求4所述的餐厨沼液处理装置,其特征在于:所述一级蒸汽净化器(2)上设置有硫酸投放口。
6.根据权利要求5所述的餐厨沼液处理装置,其特征在于:所述二级蒸汽净化器(3)上设置有氢氧化钠投放口。
7.一种通过权利要求6所述的餐厨沼液处理装置来实现餐厨沼液处理的方法,其特征在于,它包括以下步骤:
A.将餐厨沼液进行预处理:
a.将餐厨沼液从沼液池引进所述混合器(4)内,并往所述混合器(4)内投放石灰乳,对沼液进行软化并调节其pH值,使沼液的pH值符合标准;
b.往调节完pH值的沼液内投放混凝剂,水中的微粒、悬浮物及胶体将会汇集成团,然后将混合液排进所述沉淀池(5)进行沉淀并分别生成上清液以及固液混合物;
c.将步骤b中生成的固液混合物输送至所述脱水机(6)内进行脱水,得到固体污泥,然后将固体污泥外运处理;
B.对上清液进行蒸发净化处理:
d.将步骤b中的上清液输送至所述MVR蒸发器(1)进行压缩蒸发,继而生成混合蒸汽以及一次浓缩液,其中所述混合蒸汽输送至所述一级蒸汽净化器(2),所述一次浓缩液留在所述MVR蒸发器(1)继续进行压缩蒸发,如此循环;
e.步骤d中生成的混合蒸汽输送至所述一级蒸汽净化器(2)内,同时往所述一级蒸汽净化器(2)内投放硫酸,使得混合蒸汽内的氨氮和硫酸反应,生成硫酸铵,所述硫酸铵装袋后外运处理;
f.步骤e中剩余的混合蒸汽输送至所述二级蒸汽净化器(3),同时往所述二级蒸汽净化器(3)投放氢氧化钠,使得混合蒸汽中的有机物和氢氧化钠反应,生成有机钠盐与二次蒸汽,所述有机钠盐装袋外运处理,而所述二次蒸汽则被冷凝成蒸馏水回流至所述MVR蒸发器(1)中;
g.所述MVR蒸发器(1)内最终生成浓缩废液与蒸馏水,所述浓缩废液回灌填埋场,所述蒸馏水则能够达标排放。
8.根据权利要求7所述的餐厨沼液处理方法,其特征在于:在步骤d中,所述混合蒸汽先经过所述除沫器(7)进行液沫分离后再进入所述一级蒸汽净化器(2)内。
9.根据权利要求7所述的餐厨沼液处理方法,其特征在于:在步骤f中,投放的氢氧化钠与所述混合蒸汽中的有机物反应,用于消除混合蒸汽中的CODcr。
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