The utility model relates to a small secondary membrane treatment device for pickling waste liquid, belonging to the technical field of industrial three wastes treatment. The device includes wastewater tank, ceramic membrane system, intermediate water tank, nanofiltration membrane system, concentrated water treatment system, wastewater from wastewater tank enters ceramic membrane system, ceramic membrane water production is connected to intermediate water tank, intermediate water tank is connected to nanofiltration membrane system through stainless steel pipeline through high pressure pump, water production from nanofiltration membrane system is connected to recycling water tank through stainless steel pipeline, and recycling water tank is equipped with acidity meter and self-contained water tank. The dynamic acid replenishment system adjusts the concentration of concentrated acid to the required concentration according to the workshop needs for recycling in the production workshop; the concentrated water of ceramic membrane system and nanofiltration membrane system enters into the concentrated water treatment system for subsequent advanced treatment. The small-scale acid pickling wastewater secondary membrane treatment device can realize the efficient recovery of acid, reduce the consumption of alkali in subsequent treatment, produce small amount of sludge, improve the resource utilization of acid pickling wastewater in electroplating, stainless steel production and other fields, not only can reduce environmental pollution, but also can obtain considerable economic benefits.
【技术实现步骤摘要】
一种小型酸洗废液二级膜处理装置
:本技术涉及一种小型酸洗废液二级膜处理装置,属于工业三废处理
技术介绍
:电镀、不锈钢生产领域在生产过程中会产生的大量富含Cr和Ni的酸洗废水,此类废水的无机酸成分主要为硝酸和氢氟酸。硝态氮排入水中,会引起水体的富营养化。氟元素可以与动植物中的多种酶发生作用,引起代谢紊乱、细胞变形、坏死,也可以引起骨质过度钙化出现骨刺、椎管狭窄,以及致癌作用。因此,酸洗废水需进行资源化回收和深度净化处理达标后方能排入环境。现有酸洗废水的处理基本采用:曝气、中和、沉淀的方法,由于传统方法仅顾及处理达标排放,所以运行成本过高,且压干的污泥往往由于处置不当容易造成重金属二次污染,同时造成资源浪费。对硝酸、氢氟酸废液的治理,欧美、日德等国都进行了很多研究工作,通常采用的方法有化学法、蒸发法、离子交换法和溶剂萃取法等。化学法可回收一些有用物质,但工艺庞杂,设备较多;离子交换把固定床改为流动床是个进步,但还存在废酸浓缩和稀酸处理问题;溶剂萃取法的优点是能量消耗少,设备、材料容易选择,但酸的回收率低。专利(201510180241)公开了一种不锈钢酸洗废液的处理及铁、铬、镍的回收方法,可以一定程度实现铁、铬、镍的分离,但是存在混酸无法回收、新添加入的氨氮及溶液中的硝态氮对后续水处理造成极大负担,中和酸的过程中中和剂用量大、成本高等问题,传统的方法难以实现有价资源的高效回收及废水的深度处理,本技术技术可实现酸的高效回收;减少后续处理中碱的消耗,产泥量小,提高电镀、不锈钢生产等领域的酸洗废水的资源化利用,不但可以减少环境污染,还能获得可观的经济效益 ...
【技术保护点】
1.一种小型酸洗废液二级膜处理装置,其特征在于,依次包括废水箱,陶瓷膜系统,中间水箱,纳滤膜系统,浓水处理系统,所述废水箱通过多级离心泵,通过不锈钢管道与陶瓷膜系统相连,陶瓷膜产水经不锈钢管道连接至中间水箱,所述中间水箱经不锈钢管道经高压泵与纳滤膜系统相连,纳滤膜系统产水经不锈钢管道连接至回用水箱,回用水箱设有酸度计和自动补酸系统;所述陶瓷膜系统浓水和纳滤膜系统浓水进入浓水处理系统;所述陶瓷膜系统和纳滤膜系统均设置进水压力表,出水压力表和流量计;所述纳滤膜采用耐酸纳滤膜;所述不锈钢管道采用抗酸耐腐蚀不锈钢管道。
【技术特征摘要】
1.一种小型酸洗废液二级膜处理装置,其特征在于,依次包括废水箱,陶瓷膜系统,中间水箱,纳滤膜系统,浓水处理系统,所述废水箱通过多级离心泵,通过不锈钢管道与陶瓷膜系统相连,陶瓷膜产水经不锈钢管道连接至中间水箱,所述中间水箱经不锈钢管道经高压泵与纳滤膜系统相连,...
【专利技术属性】
技术研发人员:林晨,林立通,虞海红,杨益清,
申请(专利权)人:上海友通环保高科技有限公司,
类型:新型
国别省市:上海,31
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