出口印染一体化污水处理设备
编辑：出口污水处理设备 来自：https://www.zqwscl.com /日期：2023-03-20 13:31 / 人气：
由于印染污水的排放总量不断增加，我国水污染问题日益加剧。印染污水具有有机物含量高、碱性大、色度高、可生化性差、水量水温变化大等特点，印染污水预处理技术环节决定着污水后续处理的难易程度，开展高效的印染污水预处理工作，可以实现污水出水达标的目标。
目前，我国的印染污水主要采用生物法、物理法、化学法等进行处理，其中，预处理包括过滤、吸附、氧化、脱色等工艺，是印染污水处理中的必要环节。印染污水的预处理与后续深度处理有着密切的关系，直接关系到印染污水处理的工程化、规模化。中侨启迪小编主要介绍“A3O+MBR”印染污水处理工艺在污水厂印染污水预处理环节中的应用。“A3O+MBR”印染污水处理工艺是 A3O 和 MBR 相结合的污水处理工艺，在传统印染污水预处理的基础上结合 MBR 膜生物反应器，采用改良的 A3O 生化处理环节。MBR 膜生物反应器采用的是由生物处理单元与膜分离单元相结合的污水处理技术。
A3O 废水生化处理工艺在传统 A2O 废水处理工艺的基础上进行改良，该废水生化处理工艺可以提高脱氮除磷的效果。A2O 工艺在市政污水领域的应用较为广泛，然而，在工业领域，由于工业废水的可生化性较差，传统的 A2O 废水处理工艺难以保证出水达标。
A3O 废水生化处理工艺主要包含水解酸化、厌氧、缺氧、好氧等工艺环节。其中，水解酸化环节是对污水及含磷污泥中的磷进行释放，并完成有机物水解反应，为后续脱氮提供充足碳源。在厌氧环节，污水继续释放磷，并通过微生物反应降低 BOD 浓度和氨氮含量。在缺氧环节，主要将氨氮还原为氮气，以完成污水脱氮处理。好氧环节则主要通过微生物将有机物进行降解。A3O 废水生化处理工艺的主要技术特点是对工业废水的处理效果较好，通过优化污泥回流方向，调整污泥回流比，在不增加水力停留时间、不扩大池容、不增加工程造价的前提下，能提升生化系统降 COD、脱氮、除磷的功效。另外，A3O 工艺还可与其他工艺复合使用，如“A3O+MBR”复合工艺可有效降解大分子有机污染物，在使废水达标排放的同时，有效缓解膜通量下降的问题，减少膜化学清洗频率，延长膜使用寿命。
“A3O+MBR”废水处理工艺兼具生物接触氧化法固定床和流化床二者的优点，是高效的污水处理方法之一。该工艺具有的优势有以下五点：
第一，“A3O+MBR”废水处理工艺提高了废水的可生化性，为后续污水处理环节中的脱氮反应提供了碳源。
第二，该技术可以有效防止硝酸盐氮进入水解酸化池而影响水解酸化效率，为后续处理环节的除磷工作提供保障。
第三，由于厌氧池和水解酸化池具有单独的厌氧微生物系统，水解酸化池中的污泥停留时间长于厌氧池中的污泥停留时间，这在提高废水可生化性的同时，能实现高效除磷脱氮的目标。
第四，MBR 膜池的添加，可以实现对生化池中活性污泥的截留。
第五，与传统的废水处理工艺相比，该废水处理工艺的出水 COD 较低，除了能大幅提高除磷效率，药剂的使用量也有所减少。
在印染污水预处理工作中应用“A3O+MBR”废水处理工艺，提高了印染污水的处理效率和质量，实现了印染水处理的降本增效目标，从而提高了污水的循环再利用效率，能有效助力国家经济发展。
The printing and dyeing industry is a traditional industry in China. In 2014, the dyeing output of printing and dyeing enterprises above the national scale exceeded 500108m, reaching 561.22108m, and the GDP of printing and dyeing industry reached 339.88 billion yuan. Printing and dyeing industry wastewater contains a large number of complex chemical substances, including fuel, additives, slurry and so on, due to the large water consumption in printing and dyeing industry, the resulting amount of industrial wastewater is huge, therefore, printing and dyeing wastewater treatment is increasingly by people's attention.
Due to the increasing total discharge of printing and dyeing sewage, the problem of water pollution in China is increasingly serious. Printing and dyeing sewage has the characteristics of high organic content, alkaline, high color, poor biochemical, water and water temperature changes, printing and dyeing sewage pretreatment technology determines the difficulty of sewage subsequent treatment, to carry out efficient printing and dyeing sewage pretreatment work, can achieve the goal of sewage effluent standard.
At present, China's printing and dyeing sewage mainly uses biological method, physical method, chemical method and other treatment, among them, pretreatment including filtration, adsorption, oxidation, decolorization and other processes, is a necessary link in printing and dyeing sewage treatment. The pretreatment of printing and dyeing sewage is closely related to the subsequent depth treatment, which is directly related to the engineering and scale of printing and dyeing sewage treatment. The small editor mainly introduces the application of "A3O + MBR" printing and dyeing sewage treatment process in the sewage treatment plant printing and dyeing sewage pretreatment link."A3O + MBR" printing and dyeing sewage treatment process is a combination of A3O and MBR. On the basis of traditional printing and dyeing wastewater pretreatment, combined with MBR membrane bioreactor, using improved A3O biochemical treatment link. The MBR membrane bioreactor uses a sewage treatment technology that combines the biological treatment unit with the membrane separation unit.
The biochemical treatment process of A3O wastewater is improved on the basis of the traditional A2O wastewater treatment process, and the wastewater biochemical treatment process can improve the effect of nitrogen and phosphorus removal. A2O process is widely used in the field of municipal sewage. However, in the industrial field, due to the poor bioavailability of industrial wastewater, the traditional A2O wastewater treatment process is difficult to ensure that the effluent reaches the standard.
The biochemical treatment process of A3O wastewater mainly includes hydrolysis acidification, anaerobic, hypoxia, aerobic and other processes. Among them, the hydrolysis acidification link is to release phosphorus in sewage and phosphorus-containing sludge, and complete the hydrolysis reaction of organic matter to provide sufficient carbon source for the subsequent nitrogen removal. In the anaerobic link, the sewage continues to release phosphorus and reduce the BOD concentration and ammonia nitrogen content through microbial reaction. In the anoxic link, ammonia nitrogen is mainly reduced to nitrogen to complete the sewage denitrification treatment. The aerobic process mainly degrades organic matter through microorganisms. The main technical feature of A3O wastewater biochemical treatment process is that the treatment effect of industrial wastewater is good. By optimizing the reflux direction of sludge and adjusting the sludge reflux ratio, the effect of the biochemical system in reducing COD, nitrogen and phosphorus removal can be improved without increasing the hydraulic residence time, expanding the pool capacity and increasing the project cost. In addition, A3O process can also be used together with other processes, such as "A3O + MBR" composite process can effectively degrade macromolecular organic pollutants, in the wastewater discharge to the standard, effectively alleviate the problem of membrane flux reduction, reduce the frequency of membrane chemical cleaning, prolong the service life of the membrane.
The "A3O + MBR" wastewater treatment process has the advantages of biological contact oxidation method and fluidized bed, which is one of the most efficient sewage treatment methods. The process has five advantages:
First, the "A3O + MBR" wastewater treatment process improves the bioavailability of the wastewater and provides a carbon source for the nitrogen removal reaction in the subsequent sewage treatment process.
Second, this technology can effectively prevent nitrate nitrogen from entering the hydrolytic acidification pool and affecting the hydrolysis acidification efficiency, and provide a guarantee for the phosphorus removal work in the subsequent treatment process.
Third, because the anaerobic tank and the hydrolytic acidification pool have separate anaerobic microbial systems, the sludge in the hydrolytic acidification tank is longer than the sludge in the anaerobic tank, which can improve the bioability of wastewater and achieve the goal of efficient phosphorus and nitrogen removal.
Fourth, the addition of MBR membrane pool can realize the interception of activated sludge in the biochemical tank.
Fifth, compared with the traditional wastewater treatment process, the effluent COD of the wastewater treatment process is lower, in addition to greatly improving the efficiency of phosphorus removal, the use of agents is also reduced.
The application of "A3O + MBR" wastewater treatment process in printing and dyeing wastewater treatment work improves the treatment efficiency and quality of printing and dyeing sewage, realizes the cost reduction and efficiency increase goal of printing and dyeing water treatment, so as to improve the efficiency of sewage recycling, and can effectively help the national economic development.
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