Sewage treatment is the process of removing pollutants from municipal wastewater, mainly including domestic sewage and some industrial wastewater. Physical, chemical, and biological processes are used to remove pollutants and produce treated wastewater that is sufficient to be safely discharged into the environment. Several wastewater treatment technologies are available today. We will focus on a widely used sewage treatment process - the sewage treatment plant using MBR technology.Let us first ask a basic question:What Is the MBR Sewage Treatment Plant?MBR sewage treatment plant is an innovative sewage treatment method. MBR, the abbreviation of “membrane bioreactor”, is the core part of the MBR sewage treatment process. It is a combination of a membrane process (such as microfiltration or ultrafiltration) and a suspension growth bioreactor. The hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled individually, and refractory organics are trapped by MBR membrane and constantly decomposed.Now let us take up the working principle of the MBR wastewater treatment plant.How Does Membrane Bioreactor Plant Work?As mentioned earlier, membrane bioreactor wastewater treatment combines conventional biological processes, namely activated sludge, with membrane filtration technology. It can be said that the working principle of the membrane bioreactor is a clever combination of membrane technology and biological treatment.In an MBR technology system, semi-permeable membranes of two-dimensional materials (microfiltration and ultrafiltration) are immersed in an aerated bioreactor. This degree of filtration allows high-quality sewage to be drawn through the membrane. It also helps eliminate sedimentation and filtration processes commonly used in wastewater treatment. Because precipitation is not required, biological processes can be operated more efficiently. Before the waste enters the membrane tank, it needs to be carefully screened or pretreated. It helps protect the membrane and extend its life by minimizing the accumulation of solid waste.Features of the MBR Sewage Treatment PlantThe main features of our MBR sewage treatment plant are as follows:1. This plant produces high-quality treated outlet water: The treated water is completely divided from suspended solids, colloidal materials, and microbial flora. The turbidity and TSS are close to 0. The plant is an affordable and reliable wastewater treatment equipment and can be chiefly used as a pretreatment procedure to eliminate suspended solids.2. The plant has small foot print and saves land: It uses higher MLSS (Mixed Liquid Suspended Solids) at a concentration of 5000-10000 mg/l. It can attain exactly the exact same loading speed with smaller reactor volume. It does not require a sedimentation tank. Compared to traditional wastewater treatment plants, it requires only a third of the land.3. The plant saves operating costs and expands the application scope of recycled water: MBR wastewater treatment system can filter out bacteria, viruses and other harmful substances. This significantly saves long-term operation expenses caused by stoichiometry and disinfection and expands the reuse application scope of the purified water.4. This plant has stable running performance and flexible control: The efficient membrane separation function perfectly captures macromolecular organics and retains them in the system. Therefore, the system can completely realize the separation of hydraulic retention time (HRT) and sludge retention time (SRT), which means that the system runs stably and is flexible to control.5. The plant has strong shock resistance: MBR membrane can prevent loss of different microbial flora. It’s much beneficial for slow-growing bacteria, such as nitrifying bacteria. The extended residence time is very helpful for the decomposition and degradation of difficult-to-degrade macromolecular organics. MBR wastewater treatment plant is strongly resistant to changes in water quality and water volume.6. The plant minimizes sludge amount and lowers sludge disposal costs: Using high MLSS, this plant only generates very only generate very a little excess sludge during system operation, thus requiring low sludge disposal costs. Applications of MBR Sewage Treatment PlantThe MBR sewage treatment plant is suitable for many applications. The followings are some examples:1.Wastewater treatment and reuse for office buildings, residential community, hospitals, hotels, schools, stadiums, etc.2.Wastewater treatment for areas where without drainage network system, like tourism scenic spots, resorts, villas, hotels, residential areas, railway stations, toll stations, temporary construction sites, etc.3.High concentration organic wastewater treatment for mining industry, food industry, pharmaceutical industry, sugar industry, alcohol industry, leather industry, paper industry, printing and dyeing industry, etc.We, Jinwantong, are one of the most professional and reliable MBR sewage treatment plant suppliers in China. As an ISO9001-certified manufacturer, we provide high-quality, cost-effective, and dependable water treatment solutions and equipment for domestic and foreign customers. You can count on our 14 years of experience in the field.If you have any questions about MBR sewage treatment system, please contact us. We will help you by giving you the best solution.
The earth contains many resources. Water is one of the most important substances in life. However, only about 3% of the water on earth is fresh water, which can be used for human and animal consumption. Therefore, it is crucial for us to find ways to treat and decontaminate polluted waters. One of the best methods is to use oil water separator systems.How do you know about this kind of water treatment system? Do you know how many types of these systems are available? Do you know the differences between these systems? Here, this passage will provide those information for you.What is an oil water separator?An oil water separator is a piece of equipment utilized to treat and decontaminate wastewater, which makes it can be safely discharged to permitted discharge points, such as sewers. It removes oil, grease and hydrocarbons, leaving only harmless water. The wastewater can then be safely discharged into the drainage system.There are several different types of oil water separators. Each has different capacities, and they are suitable for different industrial and commercial applications. They can be utilized to deal with various contamination found in water, such as free slicks, emulsified oils, dissolved oils and suspended solids.Types of Oil Water Separators SystemsDifferent types of wastewater often require different kinds of oil water separator systems to effectively treat water. The four common types of oil-water separators are:Conventional Gravity Separator System (API)Traditional gravity separators, also known as API separators, use gravity to separate oil and other pollutants from water. They work because oil is lighter or less dense than water. Therefore, when oily water is put into the separator, the oil rises to the top, the solids and sediments sink to the bottom, and the water remains in the middle. The oil is then skimmed from the top and treated, while water flows freely through an outlet on the side of the tank for further processing or release to the environment. The solids and sediments are scraped from the bottom into a sludge pump for processing.Parallel Plate Gravity Separator System (CPI)In this type of CPI oil water separator system, corrugated plates made of lipophilic materials are placed in a tank parallel to each other, and the space between the tanks is about 6-12 mm. Water and oil are then allowed to flow through the storage tank and between these plates. The oil in the water is attracted and stuck to the plates.As an increasing number of oil droplets attach, they form larger droplets and eventually grow to the surface in which they're collected and discharged into a used oil tank. The water, free of petroleum, is permitted to keep on flowing through the tank and to some sterile water socket, where it could subsequently be released to other applications.Hydrocyclone Oil Water Separator SystemA hydrocyclone oil water separator system uses an active vortex that is generated when oil-containing water is injected into the tank at an angle. The centrifugal forces accelerate as they form a whirlwind or spiral shape. Since water is denser than oil, water is pushed to the outer edge and falls towards an outlet that causes further processing or entry into the environment.The lighter oil is forced to move towards the center and into the waste tank from the top upwards. This type of oil water separator is suitable for efficient oil removal from water, like applications in factories and in highly polluted waters.Flotation Separator SystemThe flotation separator is commonly referred to as DAF (Dissolved Air Flotation) oil water separator, which uses dissolved air to increase the rate of oil rise. In the separator, oily water is mixed with water filled with dissolved air to form small air bubbles. The oil in the water adheres to these bubbles and is brought to the surface of the separator, where oil, sludge and solids are skimmed and stored in another tank. Any heavy rising solids or sediments will sink to the bottom and be collected in the gutter. DAF wastewater then passes through an outlet and is ready for reuse or further filtration.Each of these systems separates water and oil via slightly different procedures, making some of them better than others based on their intended usage for a particular business or industry. When factories, restaurants, commercial businesses, and marine industries choose to utilize these water treatment methods in cooperation with their operation, they can be more efficient, healthier and better for the environment.Jinwantong is an ISO9001-certified wastewater treatment equipment manufacturer. We are an expert in developing wastewater treatment equipment, systems, and solutions. We have 14 years of experience and expertise in treating wastewater. We provide a variety of oil water separator systems. Get professional advice on your business wastewater compliance and oil-water separators. Feel free to contact us.
Package wastewater treatment plants are pre-manufactured treatment facilities used to treat wastewater in small communities or on individual properties. Here is a outline of this kind of treatment equipment.What Is A “Package Plant?”The expression “package plant” derives from the fact that these types of sewage treatment plants are built and assembled in a factory and then shipped and installed “prepackaged” as a complete unit. These package sewage treatment plants became popular throughout the 1960s and are still widely used today. Usually, they are made of 1/4-inch steel and are divided into sections. The components always contain an aeration tank in which the majority of the treatment happens and a clarifier for settling. Some package treatment plants include a sludge waste compartment and chlorine contact tank. Package plant tanks would be transported on flatbed trucks, unloaded by cranes, and placed on cast-in-place concrete slabs. Several lengths of rebar will extend up through the slab and then be welded to the tank to prevent floating. Another popular tank material is precast concrete. The prefabricated system can be a single storage tank divided into multiple compartments, or it can be a modular system of a larger system. Typical precast concrete tanks are 6’-10’’ x 12’-10’’ or 7’ x 15’. These tanks are cast at the concrete tank maker’s factory and transported by boom-type trucks for off-loading. Generally, after the water tank is installed, the pipes and equipment are set up at the installation site.What Is An Extended Aeration Package Treatment Plant?An extended aeration package treatment plant is a package plant that uses extended aeration processes. Extended aeration is an aerobic treatment process in which there is a long residence time to oxidize sewage. The typical residence time of a conventional aeration process is 8 hours. The residence time for prolonged aeration is 24 hours. The extended aeration process can operate efficiently with a dwell time of 12 to 48 hours. The extended aeration treatment is very thorough and can almost completely oxidize organic matter. If the system design is reasonable, nitrification will also occur in the aeration system. The extended aeration system has a high sludge age and generates a large amount of waste activated sludge that needs to be removed regularly. How Does Sewage Treatment Take Place in An Extended Aeration System?Whether an extended aeration package treatment plant works effectively depends heavily on the extended aeration system. Extended aeration is a biological treatment process in which microorganisms decompose sewage. There are five basic components necessary for the process:1. Water - provided by facilities that produce wastewater2. Sewage - Facilities are also provided; Sewage is microbial food3. Oxygen - Oxygen is the energy source for microorganisms to metabolize sewage and convert it into itself and carbon dioxide4. Microorganisms - Microbes naturally exist in sewage. Through the natural selection process, certain organisms will multiply in aeration tanks.5. A storage tank or container containing the above four components - the storage tank is the “dwelling” or habitat where the organism is to live and the location where the treatment is performed.The above 5 components must be balanced for proper treatment of an extended aeration package treatment plant. The design of the extended aeration system is critical to its performance and to achieve the expected results of wastewater treatment. Microorganisms use sewage as food and use oxygen provided by blowers as energy. They metabolize sewage and oxygen and absorb a part of the sewage into their own bodies. They will multiply themselves and provide inert harmless by-products of carbon dioxide and water. The number of microorganisms will be controlled by the amount of food and air available and the time available. Too few or too many of these variables can disrupt the balance of the system and reduce the quality of treatment.What Are Some Other Major Components in Package Sewage Treatment Plants?Today, most package sewage treatment plants are supposed to further refine the treatment process by installing a tertiary process after the secondary treatment process. Slow sand filters are considered tertiary treatment. Sand filters provide a safety net to capture any solids that may leave the secondary treatment plant. The suspended solids content in filtered wastewater is very low, typically between 1 mg / l and 12 mg / l. Fixed membrane treatments have some additional benefits. In some cases, organisms attach themselves to the sand and provide some additional oxidation and nitrification. The surface of the sand filter will eventually be covered by a layer of biological solids, and water can no longer pass through the solids. When this is achieved, the filter should be taken offline and drained and air-dried for cleaning. After drying, the biomass forms a light skin that can be tilted or shoveled off, placed in a trash can, and finally taken to an approved landfill. Weeds are sometimes a problem in sand filters, and dormant filters may need to be covered with black plastic to kill weeds and seeds.What Should A Properly Operating Package Treatment Plant Look Like?A perfect looking extended aeration package treatment plant owns a rich brown colour in the aeration tank. The clarification tank should have a very clear supernatant, and there should be a visible sludge blanket below it. The supernatant depth may vary from 6 inches to 48 inches. The depth of this supernatant will fluctuate during the course of a day based upon the flow speed. Higher flow rates will cause the sludge blanket to rise, thereby reducing the depth of the supernatant.No two package sewage treatment plants look the same or operate the same. They come in various sizes and configurations. Most people operate these systems well in most situations. If the size is right, it is not easy to flow in and infiltrate, and most importantly to be properly maintained, the expanded aeration plant will work well. Some systems are constantly overloaded and will never function properly because they simply do not work. With proper attention, some systems can operate normally. All systems experience failures and routine failures. These annoyances and malfunctions require immediate identification and correction by service personnel or operators. All processing systems require frequent inspection and maintenance by trained personnel. Running and evaluating package wastewater treatment plants is both science and art. The time and experience of these package treatment plants is ultimately the best teacher.We - Jinwantong - are a professional package sewage treatment plant manufacturer. We have 14 years of experience and experts in developing and manufacturing package sewage treatment plants. If you want to know more about or get these plants, we can help you! Please feel free to contact us at https://www.chinaclarifier.com/.
MBR technology, MBBR technology and FBBR technology are popularly used wastewater treatment technologies. They can be widely seen in industrial applications with high BOD content, such as food and beverage, dairy products, chemicals, leachate, etc. However, some people may not fully understand the three technologies or the differences among them. This blog will provide some basics to help people better understand MBR, MBBR and FBBR.What Are MBR, MBBR, and FBBR?MBR (Membrane Bioreactor)MBR stands for membrane bioreactor. It is a kind of wastewater treatment technology. The MBR wastewater treatment is a popular choice for municipal and industrial applications. The MBR process is a combination of membrane processes such as ultrafiltration and activated sludge process. The membrane is mostly immersed in an activated sludge tank or a separate tank. Microorganisms consume organic matter in sewage by consuming oxygen. Since the membrane retains microorganisms and organics in the basin, higher MLSS concentrations are achieved.High microbial content requires a huge amount of air. It needs not only oxygen but also sufficient mixed air to clean the membrane and limit scaling.MBBR (Moving Bed Bioreactor)MBBR is the brief form for moving bed bioreactor. It differs form MBR technology. It utilizes free-floating plastic fill media for attached biofilm growth. In order to keep the plastic filling medium in a suspended state, its density is close to that of water. Continuous aeration or mixing ensures good contact between the organics and the attached biofilm, thereby effectively removing BOD.FBR (Fixed Bed Bioreactor)FBBR means fixed bed bioreactor. The working principle of FBBR is very similar to that of MBBR, except that the biofilm is attached to a fixed block of filled media. Filled media blocks are typically arranged as submersible recyclable cages within a pond. Diffusion ventilation under the shroud unit provides the required oxygen for the biofilm and controls the scour of the filled media block.Comparison Between MBR vs MBBR and FBBRLet’s make a more clear comparison between MBR vs MBBR, and MBR vs FBBR.MBR (Membrane Bioreactor)Compared with other biological processes such as fixed beds, the sensitive MBR process is unable to handle overloading and is costly to operate and maintain. And the membrane cleaning requires chemicals. MBR plants utilize biodegradation and physical separation.A screen for the elimination of grease and grit forms a portion of the upstream equipment to prevent membrane blockage.An MBR system is a filtration device with a high concentration of bacteria (held inside the membrane), which is 4-5 times higher than FBBR and MBBR systems. Depending on the size of the membrane pores, even bacteria can be separated from the water. Negative pressure is required to support the flow of wastewater through the membrane, which is an energy-intensive process and may be costly. In addition, it is necessary to backwash the membrane at set intervals and to replace the membrane occasionally. The system requires regular professional maintenance and upkeep.The MBR system includes an upstream activated sludge buffer. Therefore, it produces less sludge than FBBR systems and MBBR systems, and no sludge sedimentation is required, which saves space.MBR process chart:Screening → Buffer → Activated Sludge Buffer → Filtration → Sludge TankMBBR (Moving Bed Bio Reactor)As for MBBR technology, upstream screening is also required to remove grit and grease, but particles smaller than 3mm are allowed to pass, and even manual screening is possible. Compared to the MBR technology, the MBBR technology simply uses bacteria because of its breakdown of impurities.The MBBR system contains particles (for example, made of UV-stabilized polyethylene) on which bacteria grow, forming biofilms on free-moving particles, thereby reducing impurities and thus sludge quality (but not as good as the MBR system). Sludge settlement is necessary after the bio-reactor at the kind of lamella technology. The advantage is that spare parts are cheaper and have a longer service life, so operating costs are lower than MBR process.MBBR process chart:Screening → Buffer → Activated Sludge By Moving Bed Media → Lamella → Sludge TankFBR (Fixed Bed Reactor)The function of the FBBR system is similar to that of the MBBR system. The only difference is that the small particles used in the MBBR can move freely in the reactor, while the FBBR system has a fixed bed material (the substrate is made of UV stabilized polyethylene) where the biofilm grows. The operation and maintenance cost of the FBBR system is lower than any other wastewater treatment process.This biological layer (microbial colony) converts organic pollutants contained in wastewater into sediments and minerals. This is primarily the work of aerobic organisms that require oxygen. An aeration system installed under the fixed bed material of the reactor provided sufficient air for the organisms. In addition, the current caused by the rising air results in a complete (horizontal and vertical) mixing of the contents of the tank due to the geometry of the fixed bed material used (characteristics of the mixing tank). The advantage of this system is that it is self-regulating and very effective. Although it is not effective as the MBR system, it has cheap, simple, and durable spare parts, thus ensuring lower operating costs than MBR process.FBBR process chart:Screening → Buffer → Activated Sludge By Fixed Bed Media → Lamella → Sludge TankThe table below shows the pros and cons of all three systems:MBRMBBRFBBREffluent water qualitySuperiorAcceptable for irrigationAcceptable for irrigationOverall costsHighMediumLowEnergy consumptionHighMediumLowRequired spaceSmallLargeLargeHandling of an electrical shutdownUp to 24 hours without problemsAfterwards bacteria will form bio-cakesGood handling Sensitivity to shifting of complex or toxic substancesGoodMediumMediumSusceptibility to a grease leakVery sensitive. Membrane needs to be cleaned well/replacedVery sensitiveLeaked oil will float upwards and is easy to remove.
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