What is the difference between a biological contact oxidation tank and an aeration biological filter

The biological contact oxidation tank is a kind of biofilm method, and the aeration biological filter is a derivative that combines the biological contact oxidation method and the fast filter in the feed water, and the main differences between the biological contact oxidation method are:

1) The contact time between the contaminant and the microorganism is much shorter.

2) It has a filtration function and does not require subsequent slurry separation measures.

3) It can withstand the impact of water temperature, BOD load, NH load, etc.

The biological contact oxidation method, also known as the submerged biological filter, is evolved from the biological filter and the contact aeration oxidation tank. The so-called biological contact oxidation method is to fill the tank with a certain density of filler, from the bottom of the pool into the air for aeration, sewage immersed in all the filler and extensive contact with the biofilm on the filler, under the action of microbial metabolic function, the organic matter in the sewage can be removed, and the sewage is purified.

The aeration biological filter is a sewage treatment process integrating biodegradation and solid-liquid separation, and is an organic combination of biological contact oxidation process and filtration process.

The functions of aeration biological filters and feedwater fast filters are not the same. They are two different types of water treatment equipment with different application scenarios and working principles.

Aeration biological filters are often used as wastewater treatment equipment to remove harmful substances such as organic matter and ammonia nitrogen in sewage, and to improve water quality when the fiber is dry. The device decomposes the pollutants in the water into water and harmless substances through the action of aeration and biological destruction of the cave membrane, so as to achieve the effect of purifying water quality.

Feedwater fast filters are used to treat domestic water. Its main role is depth filtration and sterilization. The fast filter usually adopts the method of gravel filtration, and uses the filter medium to filter out the impurities, particles and organic matter in the water, so as to purify the water quality and reduce the concentration of microorganisms in the water.

Therefore, although aeration biological filters and feedwater fast filters are both water treatment equipment, their uses and functions are very different.

Summary. Hello, the arrangement of the aeration pipe of the biological contact oxidation tank should follow certain principles, such as ensuring uniform aeration, controlling the air flow, etc., which can be designed according to the shape and size of the pool.

Hello, the arrangement of the slag gas pipe of the biological contact oxidation tank should follow certain principles, such as ensuring uniform aeration, controlling air flow, etc., which can be designed according to the shape and size of the pool.

Can you tell us more about that?

Biological contact oxidation pond is a common wastewater treatment equipment, which works by using microorganisms to decompose and treat organic wastewater. Adding an appropriate amount of oxygen to the tank can promote microbial metabolic activities, thereby improving the efficiency of sewage treatment. Therefore, the arrangement of the aeration pipe is one of the keys to determine the oxygen situation in the pool.

The arrangement of the aeration pipe should follow the following principles:1Ensure that the exposure is even:

The aeration pipes should be arranged in such a way that the oxygen is sufficiently dispersed throughout the basin to ensure adequate contact between microorganisms and wastewater. In general, the aeration pipes should be evenly distributed along the length or width of the pool in order to achieve uniform aeration. 2.

Control the air flow: The arrangement of the aeration pipe should take into account the control of the aeration volume and air flow to achieve the best treatment effect. In general, the aeration tube should be arranged according to the design requirements and the air flow should be dynamically adjusted according to the grip in the solid belt.

3.Consider the shape and size of the pool: Different shapes and sizes of biological contact oxidation tanks require different aeration pipe arrangements.

For example, for a long tank, aeration pipes can be arranged along both sides of the pool; For round or square pools, an aeration tube can be set at the bottom of the pool** to achieve aeration by spraying air bubbles around the pool. In short, the arrangement of the aeration pipe of the biological contact oxidation tank should follow the principles of uniform aeration, control of air flow, etc., and be designed according to the shape and size of the pool. Reasonable aeration pipe arrangement can improve the efficiency of wastewater treatment, reduce operating costs, and extend the service life of equipment.

Both aeration biological filters and biological contact oxidation tanks use biological adsorption and oxidation to purify water quality.

The aeration biological filter not only has biological adsorption, oxidation, but also the filtration of solid-liquid separation, so the composition of the sewage treatment system of the process needs to have a primary sedimentation tank, but does not need a secondary sedimentation tank, and the filling (filter) material is generally used granular filter material such as ceramsite, with a particle size of 3-8mm. The operation of the system needs to be backwashed, the power consumption is large, and the degree of automation is high.

The composition of the biological contact oxidation system requires a primary sedimentation tank and a secondary sedimentation tank, and the contact sedimentation tank is generally used. The application of this method to treat urban sewage is mostly two-stage. The filler (filter) material can be crushed stone, slag, coke, plastic and other granular fillers, and can also be used corrugated board, soft fiber, plastic honeycomb and other fillers.

The system generally does not require backwashing.

The ratio of air to water required for aeration biological filter is generally 10-6:1, and the ratio of air to water required for contact oxidation is 20-30:1.

Biological filters are generally used in the advanced treatment of domestic sewage or industrial wastewater, which can reduce the COD to below 30-50.

With the same treatment efficiency, the use of aeration biological filter can save land and reduce engineering investment, but the operating cost and automatic control management cost increase greatly.

Biological filters, which are biological treatment structures composed of crushed stone or plastic fillers, are used as microbial membranes growing on the surface of sewage and fillers.

Interstitial contact to purify the wastewater. Biological treatment structures composed of crushed stone or plastic fillers, the sewage hall refers to the contact between the water and the microbial membrane growing on the surface of the filler, so that the sewage can be purified. The biological filter is an artificial biological treatment technology developed on the basis of the principle of soil self-purification, on the basis of the practice of sewage irrigation, through the primitive batch sand filter and contact filter.

Biological contact oxidation process is a wastewater biological treatment method derived from the biofilm method, that is, a certain amount of filler is filled in the biological contact oxidation tank, and the organic matter in the wastewater is oxidized and decomposed through biological oxidation to achieve the purpose of purification. Biological treatment is a link after physical and chemical treatment, and it is also an important link in the whole cycle process, where ammonia nitrogen and nitrite acid.

Nitrate, hydrogen sulfide.

and other harmful substances will be removed, which will play a key role in the further treatment of water quality in the process in the future. If it can be used with JBM's new combined biofiller, it can accelerate the biodecomposition process, which has the advantages of simple operation and management, low investment, high treatment effect, and minimized land occupation.

6.Aeration biological filters.

The aeration raw mill flush filter is a new sewage treatment process developed on the basis of ordinary biological filter and drawing on the process of feed water filter. It is a new type of high-load submerged three-phase reactor, which has the advantages of both activated sludge method and biofilm method, and combines the two treatment processes of biochemical reaction and adsorption filtration in the same structure. The bioreactor is filled with a high specific surface area granular filler to provide a carrier for microbial film growth, which also acts as a physical filter.

Workflow for aeration biofilters.

After sand sedimentation and initial sedimentation, the sewage enters the aeration biological filter, and in the presence of dissolved oxygen, the biofilm in the filter is used to degrade the nuclear circle pollutants in the sewage. The treated water from the filter enters the disinfection tank and is discharged after disinfection.

Starting from the sewage to be treated enters the filter tank, the air is blown by the blower and supplied to the tank for the metabolism of the microbial membrane, and the microbial membrane growing on the filter material absorbs soluble organic pollutants from the sewage as nutrients required for its physiological activities, and decomposes the organic pollutants in the metabolic process to purify the wastewater. As the treatment progresses, more and more new biomass is generated on the surface and inside the packing, the trapped suspended solids continue to increase, the head loss in the filter media increases, and the water level rises, and the filter media needs to be backwashed immediately to restore the treatment capacity. Backwashing is usually done with a combination of air and water.

MBR (Membrane Bioreactor) is suitable for new construction and small to medium-scale wastewater plants, and the effluent quality is very good and can be directly reused.

It is required to operate finely, and it is easy to have problems in large-scale applications, and it is not suitable for promotion in the whole country, especially in large-scale large and medium-sized sewage plants.

BAF (Aeration Biological Filter) is feasible for large, medium and small sewage plants, which are connected to the secondary treatment and do not affect the drainage after the secondary treatment. If there is a problem with the BAF process, the effluent after secondary treatment is discharged;

If there is a problem with the MBR, it will discharge untreated raw sewage, such as a power outage or a problem with the membrane, which can only overflow, and the damage to the environment is far greater than that of secondary effluent.

Biological contact oxidation pond is the ultimate treatment commonly used in small sewage treatment, the filler is generally made of fiber, the biological contact oxidation method is a biofilm process between the activated sludge method and the biological filter, which is characterized by setting the filler in the pool, aeration at the bottom of the pool to oxygenate the sewage, and make the sewage in the pool in a flowing state, so as to ensure that the sewage is in full contact with the filler in the sewage, and avoid the defect of uneven contact between the sewage and the filler in the biological contact oxidation tank.

Compared with the ordinary activated sludge method, the aeration biological filter has the advantages of high organic load, small footprint (1 3 of the ordinary activated sludge method), less investment (saving 30%), no sludge expansion, high oxygen transmission efficiency, and good effluent quality, but it has strict requirements for influent SS (generally requires SS 100mg L, preferably SS 60mg L), so the influent water needs to be pretreated. At the same time, its backwash water volume and head loss are large. In addition, as a new process integrating biological oxidation and interception of suspended solids, the aeration biological filter saves the follow-up sedimentation tank (secondary sedimentation tank), has a volumetric load, large hydraulic load, short hydraulic retention time, less infrastructure investment required, and good effluent quality

Low energy consumption and low operating costs.

One is the long biofilm on the filter material of the filter, and the other is the ordinary biochemical tank with packing.