How to treat papermaking wastewater in MBR process

The full English name of MBR is Membrane Bio-Reactor, which translates to membrane bioreactor.

Students who have not been in contact with it must think that it is very abstract just by listening to the name, but in fact, it is actually very simple, and everyone can understand it this way.

The biggest change of MBR compared with the traditional activated sludge method is that the secondary sedimentation tank is removed and the membrane tank is added.

To put it simply, the secondary sedimentation tank is to separate the mud and water by gravity, and various emergencies may occur in this link, such as black lumpy sludge residue and foam on the surface of the floating tank on the sludge, which makes countless environmental protection people headaches, and the membrane used in the MBR process has the same function as the traditional secondary sedimentation tank, which is to carry out solid-liquid separation, and the benefit of the membrane is that the separation is more thorough.

Membrane bioreactor (MBR) is a combination of membrane treatment technology and biochemical treatment technology, with the advantages of simple process, good effluent quality, simple operation and management, small land occupation, etc., the technology has been widely used in Germany, the United States, Japan and other countries in the field of sewage treatment and reuse.

Composition of Quante MBR:

From the overall structure, MBR is mainly composed of three parts: membrane module, bioreactor and pump unit, of which the bioreactor is the main place for pollutant degradation, the membrane module is equivalent to the secondary sedimentation tank in the biological treatment system, which plays the role of solid-liquid separation, and the pump is the power of the system effluent.

Process flow: conditioning tank-oxygen tank-MBR

MBR process features:

Compared with other biological treatment processes, the MBR process has the following characteristics:

1) Good effluent quality and high stability: membrane filtration of effluent makes the biological concentration in the bioreactor much higher than that of the ordinary activated sludge method, which greatly improves the biodegradation ability and load impact resistance. At the same time, the sludge has a long residence time, which also allows microorganisms with slow proliferation rate such as refractory organic matter decomposers and nitrifying bacteria to multiply and enrich in the reactor, especially for the removal of refractory organic matter and ammonia nitrogen.

On the other hand, the interception effect of membrane separation on organic macromolecules smaller than the membrane pore size can ensure that the filtered effluent is stable in terms of sterilization, elimination of suspended solids and reduction of BOD.

2) Less land occupation: The membrane bioreactor can maintain a high sludge concentration, usually MLSS is 8 20g L, which is twice that of traditional biological treatment, and the system eliminates the secondary sedimentation tank and sludge reflux equipment, thus saving floor space.

3) Simple operation and maintenance: the membrane separation unit has a simple process, the effluent and operation are not affected by factors such as sludge expansion, the operation and maintenance are simple and convenient, and it is easy to realize automatic control and management.

4) Low sludge disposal water cost: the sludge concentration of the system is high and the sludge age is long, which means that the sludge discharge volume is small, and the sludge production only accounts for 30% of the traditional process, which is extremely beneficial for subsequent sludge treatment.

It is a treatment process that replaces the traditional secondary sedimentation tank with membrane separation, to put it bluntly, there is no secondary sedimentation tank behind the biochemical tank, and the membrane can be replaced by membrane equipment, and the membrane can be an immersion ultrafiltration membrane or an external ultrafiltration membrane.

Membrane bioreactor (MBR) is a new wastewater treatment technology that combines high-efficiency membrane separation technology with activated sludge method, which can be used for municipal or industrial wastewater treatment with high organic content. Although the technical application of the aerobic MBR process dates back to the 70s of the 20th century, its large-scale commercial application in the field of wastewater treatment has only begun in the last 10 years.

The solid-liquid separation process using membrane modules replaces the traditional sedimentation process, which can effectively remove solid suspended particles and organic particles to prepare sterile water. Compared with the traditional process, MBR can make the activated sludge have a higher MLSS value, prolong its residence time in the reactor, improve the nitrogen removal rate and the degradation of organic matter.

MBR is a modern, efficient water treatment system that meets the growing demand for municipal wastewater treatment and greatly improves the quality of the wastewater after treatment.

Motimo's MBR system is a simple-to-operate, highly automated process that offers the following advantages:

Compared with traditional treatment systems, it can save 50% of the land use area;

It can treat sewage with high MLSS content (10g L) and has a long sludge retention time (30 days);

For different influents, there is a stable quality of produced water;

Low sludge yield, reducing the cost of treatment;

Low energy consumption, simple cleaning, low operating costs;

1. Upgrading of sewage treatment facilities, centralized sewage treatment stations in rural areas 2. General wastewater: domestic wastewater, municipal sewage.

3. High-concentration organic wastewater: food processing wastewater, breeding wastewater, slaughterhouse wastewater, etc. 4. Refractory industrial wastewater: printing and dyeing, chemical, medical, coking wastewater, landfill leachate, etc.

5.How to ensure the construction period of non-stop water renovation?

First of all, through technological innovation, our company has innovated the installation method of interception system, aeration system and other equipment, optimized the installation procedure, completed the prefabricated processing in the company, and saved on-site installation time. Secondly, through organizational innovation, in the process of project implementation, our company repeatedly deduces the process implementation, strictly controls the quality of process implementation, and closely cooperates with all parties on the project site to ensure the transformation of the construction period through the rational use of installation technology and scientific allocation of the construction period. For example, Taiyuan Chengnan Sewage Treatment Plant, with a scale of 200,000 tons per day and four series of biochemical pools, was originally planned to have a 45-day transformation period, but it actually took only 40 days to complete all the transformation of the MBBR process.

6.Is this the only non-stop water transformation performance?

At present, Sipurun has successfully completed the implementation of a number of non-stop water transformation projects, including Shanxi Taiyuan Chengnan, Shanxi Yuncheng Linyi, Zhejiang Lishui Water Pavilion, Tianjin Gangdong. In the case of ensuring the stable operation of the sewage plant, it can not only overcome the objective factors such as tight construction period and high difficulty of transformation, but also maintain the owner's operating income during the transformation period, reduce the pressure of local environmental protection, complete the upgrading and transformation in a short period of time and ensure the stability of the effluent. It has a good application prospect in the upgrading and transformation of sewage treatment plants.

7.If there are several groups of biochemical tanks in the sewage plant, MBBR should be used for pool-by-pool transformation, and the other pools bear the amount of water in this pool, which is equivalent to not stopping the water, is there a difference from what you call non-stop water?

MBBR pool-by-pool transformation is the traditional way of biochemical pool reuse transformation, the transformation of the series is to stop water for dozens of working days, other series of overload operation, is not the real meaning of non-stop water. Moreover, with the development of society, many sewage plants are running at full capacity and do not have the conditions for alternate operation, so the non-stop water transformation we mentioned is an underwater operation, which truly meets the full load of the sewage plant for transformation.

Yes, I did a printing and dyeing wastewater project, and this is the process.

Printing and dyeing wastewater is the wastewater discharged from printing and dyeing factories that mainly process cotton, linen, chemical fibers and their blended products. The amount of printing and dyeing wastewater is relatively large, and 100 200 tons of water is consumed per 1 ton of textiles processed by printing and dyeing, of which 80% to 90% is discharged with printing and dyeing wastewater. Textile printing and dyeing wastewater has the characteristics of large amount of water, high content of organic pollutants, large alkalinity, large changes in water quality, etc., and is one of the difficult to treat industrial wastewater, which contains dyes, slurries, additives, oils, acids and alkalis, fiber impurities, sand substances, inorganic salts, etc.

Commonly used treatment methods include utilization and harmless treatment.

**Utilization: 1) Wastewater can be used separately according to the characteristics of water quality, such as the diversion of bleaching and boiling wastewater and dyeing and printing wastewater, and the former can be convection washing. One water for multiple purposes to reduce emissions;

2) The use of lye, usually by evaporation, such as the large amount of lye, can be evaporated with three effects, the amount of lye is small, can be evaporated with thin film;

3) Dyes**. For example, Shilin dye can be acidified into cryptoic acid, which is colloidal particles. Suspended in the residual solution, precipitated and filtered, ** utilization.

Harmless treatment can be divided into:

1) Physical treatment methods include precipitation method and adsorption method. The precipitation method mainly removes suspended solids in wastewater; The adsorption method is mainly to remove dissolved pollutants and decolorization in wastewater.

2) Chemical treatment methods include neutralization method, coagulation method and oxidation method. The neutralization method is to adjust the pH in the wastewater, and can also reduce the color of the wastewater; The coagulation method is to remove disperse dyes and colloidal substances from wastewater; The oxidation method is to oxidize the reducing substances in the wastewater to precipitate sulfur dyes and vat dyes.

3) Biological treatment methods include activated sludge, biological turntable, biological rotating drum and biological contact oxidation method. In order to improve the effluent quality, meet the discharge standards or ** requirements. It is often necessary to combine several methods.

Among them, MBR membrane treatment has a large number of applications in the field of printing and dyeing sewage, and the treatment effect is ideal.

MBR membranes can be used in the treatment of wastewater in the printing and dyeing industry.

Printing and dyeing industry wastewater can be treated with MBR membranes.

The printing and dyeing industry often produces some printing and dyeing wastewater in the process of dyeing production. Slightly different from other industrial sewage, printing and dyeing wastewater not only has a large drainage capacity, a higher degree of water pollution, and the impurities contained in the wastewater are also more diverse. Therefore, it is more difficult to treat printing and dyeing wastewater, and the treatment technology required is also higher.

The traditional treatment methods of printing and dyeing wastewater mainly include chemical method and process combination method. With the gradual development of the printing and dyeing industry and the continuous innovation of printing and dyeing technology, the components in the printing and dyeing wastewater have become more complex, and the traditional wastewater treatment methods have been unable to meet the standards of wastewater treatment.

The application of membrane bioreactor technology perfectly makes up for the shortcomings of traditional wastewater treatment methods and better meets the requirements of printing and dyeing wastewater treatment. Although membrane bioreactor technology is an emerging technology, it is also a technology with efficient wastewater treatment capabilities. This technology not only has the advantages of traditional printing and dyeing wastewater treatment technology, but also avoids the shortcomings of traditional treatment technology, and is cleverly combined with membrane separation technology.

As an advanced wastewater treatment equipment, the membrane bioreactor effectively filters the pollutants in the wastewater through the action of biofilm, so as to further meet the requirements of printing and dyeing wastewater treatment and complete the utilization of printing and dyeing wastewater. At present, in the printing and dyeing industry, the traditional wastewater treatment method has been gradually desalinated, and this new membrane bioreactor technology has been widely used.

Yes, MBR membranes can be used in the following areas.

1) It is used in the treatment of high-concentration, toxic and refractory industrial wastewater. For example, high-concentration organic wastewater is a more common source of pollution, and the annual discharge of high-concentration organic sewage in the national papermaking, sugar, alcohol, leather, synthetic fatty acids and other industries is very large, and this kind of sewage is treated by conventional activated sludge method although it has a certain effect, but the effluent quality is difficult to meet the requirements of the discharge standard. The technical advantages of MBR determine that it can effectively treat sewage that is difficult to be treated by conventional methods, and the effluent can be reused.

2) Updating and upgrading the existing urban sewage treatment plant, especially for the situation that the effluent is difficult to meet the standard or the treatment flow rate increases dramatically and the area cannot be expanded.

3) It is used in areas and places with sewage reuse needs, such as car washes, hotels, mobile public toilets, etc., and gives full play to the characteristics of membrane bioreactor with small footprint, compact equipment, automatic control, flexibility and convenience.

4) It is used for the treatment and reuse of landfill leachate.

5) It is applied in small-scale sewage treatment plants, which is determined by the quality of the membrane.

6) It should be used in areas without drainage pipe network system, such as small settlements, resorts, tourist scenic spots, etc.

7) It is applied to the removal of trace pollutants in the drinking water source of the existing waterworks.

Let's give you a few examples, municipal sewage industry, landfill leachate industry, printing and dyeing wastewater reuse, electronic industry wastewater, chemical wastewater, chemical fiber wastewater, electroplating wastewater, as long as the design is reasonable, the use effect is good.

The use and scope of application of MBR flat sheet membrane.

UsesThe original sewage treatment system was expanded, upgraded and transformed.

Municipal sewage treatment system was newly constructed.

Reclaimed water reuse. Scope: Domestic sewage treatment and reclaimed water reuse for new rural construction.

Domestic sewage and new water reuse in industrial and mining enterprises, rural areas, outposts, tourist attractions, etc.

Industrial wastewater treatment similar to domestic sewage.

Areas subject to site constraints and water scarcity.

Effluent water quality: better than the national sewage discharge level A standard, can be used for green irrigation, car washing, road dust reduction and washing, toilet flushing, fire fighting, landscape supplementary water and other non-potable water places.

Uses of MBR membranes:

1. Surface water treatment, MBR membrane can be used for surface water treatment, and the treated water is used for irrigation or as inlet water for reverse osmosis to prepare pure water.

2. Seawater desalination pretreatment, many coastal areas in the world are relatively lacking in freshwater resources, and the solution is to desalinate seawater to produce fresh water. Distillation technology was commonly used in the early days, and from the 60s of the 19th century, technologies such as reverse osmosis were used to solve the problem of water scarcity in these areas. However, many reverse osmosis desalination systems face the problem of severe contamination of reverse osmosis membranes.

This is mainly due to the fact that the traditional pretreatment methods of reverse osmosis systems do not provide reliable feed water quality. MBR membrane can control the quality of seawater very confidently, provide high-quality inlet water for the reverse osmosis system, and ensure the stable operation of the reverse osmosis system.

3. Sewage reuse, with the development of industry, water pollution is becoming more and more serious, and fresh water resources are becoming more and more scarce. MBR membranes offer an attractive solution for wastewater reuse. After the treatment of MBR membrane, the municipal sewage can be used as industrial water or even drinking water.

4. Other purposes.

MBR membranes can also be used in many other fields, such as replacing traditional sand filtration methods; Reclaimed water reuse. direct drinking water system; Replace conventional treatments such as coagulation and sedimentation sand filtration; deturbidity, sterilization and purification of water for food, biology and pharmaceutical industries; Juice beverage processing and wine deturbidity; Turbidity removal and refining of traditional Chinese medicine extract; Electrophoretic paint**; Latex **; domestic sewage treatment; Protein in whey; extraction of enzymes; gelatin concentration; Protein**, etc.