Why anaerobic and aerobic to treat water quality What is the principle?

When it comes to treating water quality, both anaerobic and aerobic treatment methods are very necessary.

Anaerobic biological treatment and aerobic biological treatment are the two main modalities that constitute biological methods.

Anaerobic biological treatment and aerobic biological treatment are complementary. The environmental conditions of anaerobic biological treatment are carried out under anaerobic conditions, which does not require oxygenation and can reduce energy consumption. In addition, anaerobic biological treatment can also reduce sludge production, can be operated with high COD concentrations, and is actually a "good helper" for the treatment of industrial wastewater with higher treatment stability and fewer operational problems.

Through anaerobic biological treatment, most of the organic matter can be disposed of, and at the same time, the biodegradability of industrial wastewater can be improved, so that the effluent quality is conducive to subsequent aerobic biological treatment.

The environmental conditions of aerobic biological treatment are that oxygenation is required to maintain the dissolved oxygen content in the water at about 4mg l, which is suitable for the growth and reproduction of aerobic microorganisms. Aerobic biological treatment can degrade COD, and after the anaerobic biological treatment sewage enters the aerobic pool, the COD concentration can be further reduced, and the removal of organic matter can be completed.

Through anaerobic biological treatment and hydrolysis acidification reactions, the anaerobic pond has the ability to withstand high concentrations of wastewater and can adapt to large changes in water quality. The anaerobic tank has a removal effect on certain heavy metal ions.

Overall, contaminants such as organic matter and heavy metal ions can be removed from water more effectively in these two ways.

The phosphorus removal process in biological treatment requires anaerobic and then aerobic. Phosphorus-gathering bacteria release phosphorus in an anaerobic state, and then absorb a large amount of phosphorus in an aerobic state to achieve the effect of phosphorus removal.

Denitrification is also divided into anaerobic and aerobic, nitrification and denitrification.

1. The aerobic pond is to create an aerobic environment (dissolved oxygen is about 4mg l), which is conducive to the growth of microorganisms. Its function is the adsorption and degradation of organic matter by aerobic activated sludge. The activated sludge is subjected to aerobic respiration to further decompose organic matter into inorganic matter.

The function of removing most of the organic matter such as COD and ammonia nitrogen in sewage and removing pollutants. Good operation is to control the oxygen content and other needs of microorganisms in the best way, so that microorganisms can have the greatest benefit for aerobic respiration.

Oxidizing carbon compounds in organic matter are usually oxidized to CO2 and H2O; Oxidation of nitrogen to nitrite nitrogen and nitrate nitrogen; Phosphorus element oxidation to phosphate; At the same time, in an aerobic environment, polyphosphate bacteria absorb several times more phosphate than under anaerobic conditions.

2. The anoxic pool is to create an anoxic environment (dissolved oxygen is less than, which refers to the reaction pool with no dissolved oxygen but nitrate. It is conducive to the growth of nutrient-deficient microorganisms. Its function is activated sludge adsorption and degradation of organic matter.

Nitrite nitrogen and nitrate nitrogen in the reflux mixture are usually released by denitrifying bacteria to generate nitrogen.

3. The anaerobic tank is to create an anaerobic environment (dissolved oxygen is about zero), which refers to a reaction pool with no dissolved oxygen and no nitrate. It is conducive to the growth of anorexic microorganisms. Its function is activated sludge adsorption and degradation of organic matter.

The anaerobic pond uses the action of anaerobic bacteria to hydrolyze, acidify and methanize organic matter, remove organic matter in wastewater, and improve the biodegradability of sewage, which is conducive to subsequent aerobic treatment.

Fourth, the interaction of anoxic, anaerobic pond and aerobic pond is interconnected and affects each other.

The reason why sewage treatment is anaerobic first and then aerobic is that under anaerobic conditions, the macromolecular organic matter in the wastewater can be decomposed into small molecules, so as to improve the efficiency of aerobic biochemistry.

If the concentration of organic matter is too high, it is anaerobic first, because the anaerobic load is relatively high, and at the same time, it can convert some of the old macromolecular substances into small molecules, which is good for the next aerobic stage, because the removal rate of anaerobic is not very high, the effluent can not be directly discharged, and it is generally not used alone.

Advantages and disadvantages of aerobic:

Aerobic biological treatment is a treatment method in which aerobic microorganisms degrade organic matter to make it stable and harmless in the presence of free oxygen. The advantages are that the reaction speed is faster, the wastewater retention time is shorter, so the volume of the treatment structure is smaller; Less odor is emitted during processing; Decomposes the degradable organic matter completely, etc.

The disadvantages include low removal rate of refractory organic matter, more sludge than anaerobic treatment, and higher operating costs.

Advantages and disadvantages of anaerobic:

Anaerobic biological treatment is to convert most of the organic matter into simple small molecule organic matter and inorganic matter such as methane under the action of transgenic anaerobic bacteria and facultative anaerobic bacteria under oxygen-free conditions, so that the sewage can be purified.

The advantages include high organic matter removal rate, low sludge volume, and low operating costs. The disadvantages include a long residence time of wastewater, incomplete decomposition of organic matter, and a lot of odor.

The following factors should be considered for sewage treatment and utilization:

1. Environmental protection requires the degree of treatment of pollution cultivation beam water.

2. The quantity and quality of sewage.

3. Investment ability. Sewage treatment technology is to use various methods to separate the pollutants contained in the sewage, or convert the pollutants into harmless substances, so that the sewage can be purified. <>

Aerobic tank: The equipment to be involved in the main macro rock will generally be blind to the aerator and mixer, the aerator is mainly used to increase oxygen, and the mixer is to play the role of homogenization.

Anoxic tank: The main equipment involved is underwater thruster or submersible mixer, internal return pump, etc. The main function is to maintain homogeneity and nitrification reflux.

Anaerobic tank: The main equipment involved is an underwater thruster or a submersible mixer, and some processes require a packer, which is mainly used to maintain the precursor of uniform grinding.

Aerobic Zone: This area of the exposed lead zone can effectively break down the organic matter in the wastewater, so that it is completely broken down by microorganisms.

Anoxic area: In this area, it can effectively reduce the concentration of solid pollutants such as suspended solids, particulate matter, and heavy metals in sewage.

Anaerobic area: In this area, sediments containing ammonia nitrogen can be effectively treated to reduce the impact on the environment.

Summary. The main reasons for anaerobic treatment and then aerobic treatment are as follows:1

Anaerobic treatment can greatly reduce the organic matter in the sewage and reduce the load for subsequent aerobic treatment. In the anaerobic environment, microorganisms decompose organic matter by fermentation, which can decompose macromolecular organic matter into small molecule organic acids, acids and methane, etc., so that COD and BOD are significantly reduced, and suitable substrate concentrations are provided for subsequent aerobic treatment. 2.

Anaerobic treatment can produce usable biogas (methane). The methane produced by the decomposition of organic matter by anaerobic microorganisms can be used as fuel and chemical raw materials to realize the resource utilization of sewage treatment. 3.

Anaerobic treatment has a good effect on the removal of ammonia nitrogen. In an anaerobic environment, microorganisms can convert ammonia nitrogen into inorganic nitrogen and release it into water, and then do aerobic denitrification treatment. 4.

Anaerobic systems have low operating costs. Anaerobic systems are simple to operate, do not require additional oxygen, and do not produce a large amount of excess sludge, so the operating costs are lower than those of aerobic systems. 5.

The aerobic system can deeply treat the effluent of the anaerobic system and discharge it up to the standard. In the aerobic system, nitrifying and denitrifying bacteria can convert ammonia nitrogen and nitrate nitrogen in the anaerobic effluent into nitrogen in the form of nitrogen, and at the same time, they can also reduce the pathogens in the effluent and make the water meet the discharge standard.

The main reasons for the anaerobic lighting treatment and then aerobic treatment are as follows: 1Anaerobic treatment can greatly reduce the organic matter in the sewage and reduce the load for subsequent aerobic treatment.

In the anaerobic environment, microorganisms decompose organic matter by fermentation, which can decompose macromolecular organic matter into small molecule organic acids, acids and methane, etc., so that COD and BOD are significantly reduced, and suitable substrate concentrations are provided for subsequent aerobic treatment. 2.Anaerobic treatment can produce usable biogas (methane).

The methane produced by the decomposition of organic matter by anaerobic microorganisms can be used as fuel and chemical raw materials to realize the resource utilization of sewage treatment. 3.Anaerobic treatment has a good effect on the removal of ammonia nitrogen.

In an anaerobic environment, microorganisms can convert ammonia nitrogen into inorganic nitrogen and release it into water, and then do aerobic denitrification treatment. 4.Anaerobic systems have low operating costs.

The anaerobic system is simple to operate, does not need to provide additional oxygen to Duan Xiao, and does not produce a large amount of excess sludge, so the operating cost is lower than that of the aerobic system. 5.The aerobic system can deeply treat the effluent of the anaerobic system and discharge it up to the standard.

In the aerobic system, the nitrifying and denitrifying bacteria can convert the ammonia nitrogen and nitrate nitrogen depth in the anaerobic effluent into the form of nitrogen gas, and at the same time, it can also reduce the pathogens in the effluent and make the water meet the discharge standard.

Therefore, in general, the sewage is first treated with anaerobic treatment, and then aerobic treatment, which can make full use of the advantages of the two biological treatment processes to achieve the high-destruction and high-efficiency removal of various tung residual pollutants in the sewage local combustion water, so that the treated water can be discharged up to the standard. The two processes work together to make them both economical and efficient.

Because under anaerobic conditions, the macromolecular organic matter in the waste water can be decomposed into small molecular organic matter, so as to improve the efficiency of aerobic biochemistry.

Anaerobic, which refers to the ability of an organism or cell to grow in the absence or absence of molecular oxygen; A type of microorganism that does not require free oxygen to grow, such as Vibrio desulfur, Shigella, Clostridium butyricum, etc.

Origins of the Biological Discipline:

In ancient times, before the development of natural science, people were puzzled by the colorful, colorful and colorful living things, and they often regarded life and inanimate as two completely different and unrelated fields, and believed that life was not subject to the law of motion of inanimate matter. Many people also attribute the various phenomena of life to an immaterial force, that is, the action of vitality. These unfounded conjectures, gradually abandoned with the development of biology, have no place in modern biology.

Around 15,000 BC In the following 5,000 years, the French made cave paintings in Lascaux, which show that our ancestors were already observing the biological world. The paintings depict bison, deer, and other animals. Around 2650 B.C., it was confirmed that the Egyptian physician Imhotep looked for the cause of disease from natural phenomena.

Papyrus found in the Nile Valley around 2000 BC has recorded information about trauma and illness.

Around 1750 B.C., Hammurabi of the Babylonian kingdom enacted laws related to the practice of medicine, which were carved into stone pillars. These laws detail the provisions on fees and severe penalties for mistakes, such as the loss of hands by Chekixin for the death of a patient in an accident. Around 1500 BC, the Chinese raised silkworms to produce fine clothes.

Farmers place bags containing ants on citrus trees to protect the fruit from insects, which is the earliest recorded use of biological control.

In 802 B.C., roses were first introduced and planted in Europe from Asia. In 570 BC, the ancient Greek philosopher Anaximander proposed that animals were first produced in water and then became land animals. In 500 BC Heraclitus of Ephes proposed:

For life, the tension between opposing forces is essential. Moreover, he believed that fire was the fundamental element. For more than 90 years, after about 460 B.C., Hippocrates, a Greek physician, lived and taught on the Greek island of Kos.

In the 20th century, especially since the 40s, biology has absorbed the achievements of mathematics, physics and chemistry, and gradually developed into a precise, quantitative, and in-depth molecular science. The basic unit of life is the cell. The phenomenon of life is the manifestation of the comprehensive movement and transmission of the three quantities of matter, energy and information in this complex system.

Life has many properties that inanimate matter does not have. <>

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Anaerobic treatment and aerobic treatment of wastewater treatment are based on the metabolic characteristics of different microbial flora. Anaerobic treatment is usually the first introduction of domestic sewage into the reactor, through good mixing and aeration control, so that the organic matter in it is decomposed by anaerobic bacteria into organic balance acid, ammonia, sulfide and some other organic substances. In this process, anaerobic bacteria can grow and multiply, transferring carbon sources and electrons to oxygen-free nitrates, carbon dioxide, methane, and water for energy.

In addition, anaerobic treatment also has the advantages of saving energy and reducing emissions. After anaerobic treatment, the effluent enters the aerobic zone. In the aerobic zone, by adding enough dissolved oxygen, the metabolic ability of aerobic bacteria is used to further oxidize the organic substances and harmful substances such as ammonia nitrogen in the sewage to convert them into stable and harmless chemical substances, so as to achieve the purpose of purifying the water section to stop the tumble and discharge up to the standard.

The combination of anaerobic treatment and aerobic treatment can complement each other's shortcomings, not only give full play to the decomposition of anaerobic bacteria and aerobic bacteria, but also improve the conversion efficiency of chemical substances, and reduce the emission of organic substances and pollutants such as nitrogen and phosphorus. Therefore, anaerobic treatment followed by aerobic treatment is a more effective sewage treatment process. <>