What is aerobic activated sludge? What is the mechanism of aerobic activated sludge purification of

Aerobic activated sludge refers to the formation of a floc composed of a large number of microbial communities after the sewage has been aerated for a period of time. This is a wastewater treatment process that uses activated sludge to remove biodegradable organic matter from sewage, as well as suspended solids and other substances that can be adsorbed by activated sludge.

This is called the activated sludge method.

Its basic technological process.

The aeration tank and the secondary sedimentation tank are connected in series, and there is a reflux sludge pipe to send the sludge precipitated from the secondary sedimentation tank back to the aeration tank. The answer comes from the Environmental Protection Pass.

Mechanism: The purification effect of aerobic activated sludge is similar to that of coagulant in water treatment engineering, and at the same time, it can absorb and.

Solubility in decomposes water.

Contaminant. Process: In three steps, under aerobic conditions, the flocculating microorganisms in the activated sludge velvet absorb the organic matter in the sewage.

The hydrolyzed bacteria in the activated sludge velvet particles hydrolyze the macromolecular organic matter as small molecule organic matter, and at the same time, the microorganisms synthesize their own cells. The dissolved organic matter in the wastewater is directly absorbed by bacteria, oxidized and decomposed in the bacteria, and its intermediate metabolites are absorbed by another group of bacteria, and then inorganized.

Protozoa and micrometazoa absorb or swallow incompletely decomposed organic matter and free bacteria.

Aerobic biological treatment: a treatment method in which aerobic microorganisms degrade organic matter in the presence of free oxygen (molecular oxygen) to make it stable and harmless. Microorganisms use organic pollutants (mainly dissolved and colloidal) in wastewater as a nutrient source for aerobic metabolism.

These high-energy organic substances go through a series of biochemical reactions, release energy step by step, and finally stabilize as low-energy inorganic substances to meet the requirements of harmlessness, so that they can be returned to the natural environment or further disposed of. It is suitable for medium and low concentration of organic wastewater, or organic wastewater with BOD5 concentration less than 500mgl.

Anaerobic biological treatment: a biological treatment method for the degradation and stabilization of organic matter by facultative bacteria and anaerobic bacteria in the absence of free oxygen. In anaerobic biological treatment, complex organic compounds are degraded, converted into simple compounds, and energy is released.

It is suitable for organic sludge and high concentration organic wastewater (generally BOD5 2000mg L).

I think this situation is vigorously related to how to measure it is to look at the trial conditions? Which ones are simpler? By content.

Thanks to my friend Fu Yanyong, the principle of sewage and the conditions of use in my district should be this in that district, you can go and see it a few times.

Then the principle and use conditions of good nutrient and anaerobic biological treatment and sewage treatment are very many.

The activated sludge aerobic aeration process is a process in which organic pollutants are exposed to oxygen**, so that the pollutants are absorbed and degraded by microorganisms.

Initial adsorption is the first stage of aerobic aeration, in which microorganisms adsorb organic pollutants on the surface of sludge aggregates by means of charge and physical adsorption. This stage can effectively reduce the concentration of organic pollutants and make the subsequent aerobic metabolism more efficient.

Aerobic metabolism refers to the process by which microorganisms decompose organic pollutants into harmless substances such as carbon dioxide, water, and microbial cells in the presence of oxygen. In the aerobic metabolism stage, microorganisms decompose organic matter into simple compounds through enzymatic reactions, which consume a large amount of oxygen and also produce a lot of heat energy.

In general, initial adsorption and aerobic metabolism are two very important stages in the activated sludge aerobic aeration process, which can effectively remove organic pollutants and ensure that the discharge of wastewater meets environmental standards.

Hello! The mechanism of water purification of activated sludge is that bacteria decompose pollutants into carbon dioxide and water, and the process is through the oxidation process of bacteria.

It only represents a personal opinion, don't spray if you don't like it, thank you.

The effect of aerobic activated sludge in purifying sewage is to fill the air through the aeration equipment, and the oxygen in the air is dissolved into the sewage to produce aerobic metabolic reaction in the activated sludge mixture, and the aerobic microorganisms multiply in large quantities, and then degrade the organic matter and other pollutants in the water to achieve the effect of purifying the sewage.

Anaerobic advantages: basically no power consumption; It can be suitable for high-concentration wastewater treatment; Biogas energy can be generated; The sludge production is small, and the mud treatment cost is low; It can treat wastewater with high surfactant content without foaming.

Anaerobic disadvantages: the effluent cannot directly meet the standard, and further aerobic treatment is required; Anaerobic deammonia nitrogen pollutants have no removal efficiency and will consume excessive carbon sources, which increases the difficulty of aerobic treatment and denitrification.

Aerobic advantages: it can be directly treated to meet the standard, and the effluent is odorless and clear;

Aerobic disadvantages: large power consumption, high sludge output, easy to foam, sludge expansion and other problems.

Dissolved oxygen (DO): about 1 2mg l.

Water temperature: is one of the important factors, within a certain range, with the increase of temperature, the rate of biochemical reactions accelerates, and the rate of proliferation also accelerates; The components of cells, such as proteins and nucleic acids, are very sensitive to temperature, and when the temperature rises or falls and exceeds a certain limit, there will be irreversible damage. Optimum temperature 15-30° C; After > 40° C or < 10° C, there is an adverse effect.

Nutrients: In the cell composition, C, H, O, N account for about 90 97%; The remaining 3 10% are inorganic elements, mainly p; Domestic sewage generally does not need to be supplemented with nutrients; And some industrial wastewater is required, generally for aerobic biological treatment process, should be pressed BOD : n :

p = 100 : 5 : 1 add n and p; Other Inorganic Nutrients:

K, MG, CA, S, NA, etc.; Trace elements: Fe, Cu, Mn, Mo, Si, Boron, etc.

pH: The optimal pH of aerobic microorganisms is between . At pH <, the fungus will prevail, causing the sludge to swell; On the other hand, the activity of microorganisms also affects the pH of the mixture.

Toxic substances (inhibitory substances): heavy metals; Cyanide; h2s；halogenated elements and their compounds; Phenols, alcohols, aldehydes, etc.

Organic loading rate: The organic matter in the sewage is originally the food of microorganisms, but when there are too many of them, it will also be detrimental to microorganisms.

Redox potential: aerobic bacteria: +300 400 mV, at least greater than +100 mV; Anaerobic bacteria:

Less than +100 mV is required, and for strictly anaerobic bacteria, <-100 mV, or even <-300 mV.

The main ones are: nutrition, temperature, pH, DO, toxic substances.

Aerobic activated sludge is a general term for aerobic and facultative anaerobic microbial groups and the organic and inorganic substances they depend on, with a wide variety of microorganisms, which can be divided into nitrifying bacteria, denitrifying bacteria, polyphosphate bacteria, etc., nitrifying bacteria mainly remove ammonia nitrogen, denitrifying bacteria mainly remove nitrate nitrogen, polyphosphate bacteria mainly remove phosphorus, and the generation and metabolism of non-autotrophic bacteria need to consume a part of organic matter, which can remove organic matter. This answer comes from the environmental protection pass, if you have any questions, please log in to consult.

Activated sludge is an aerobic biological treatment method Activated sludge basic concept activated sludge.

Activated sludge. In 1912, the British Clark and Cage discovered that long-term aeration of wastewater would produce sludge and significantly improve the water quality, and then Arden and Lackett further researched and found that because the experimental container was not clean, the residue left on the bottle wall improved the treatment effect, so as to discover the active microbial microbial colloid, named activated sludge.

It is mainly composed of a large number of heterotrophic bacteria, aerobic bacteria, rotifers, flagellates and so on.

Haonutrient activated sludge is composed of aerobic microorganisms that purify water through aerobic respiration.

The effect of aerobic activated sludge in purifying sewage is to fill the air through the aeration equipment, and the oxygen in the air is dissolved into the sewage to produce aerobic metabolic reaction in the activated sludge mixture, and the aerobic microorganisms multiply in large quantities, and then degrade the organic matter and other pollutants in the water to achieve the effect of purifying the sewage.