What are the main influencing factors of activated sludge denitrification process?

Taking the activated sludge of the sewage treatment plant rich in denitrifying polyphosphorus bacteria (using anaerobic + carrousel oxidation ditch process) as the research object, the experimental study of static anaerobic phosphorus release and denitrification polyphosphorus was carried out, and the carbon source, nitrate and temperature and other factors had an impact on the activated sludge.

Answer: The main factors affecting the operation of the activated sludge method are:

1. BOD load and SS load: it is the main basis for the design and operation of the aeration tank, which directly affects the pool capacity and effluent quality of the aeration tank;

2. Hydraulic retention time (SRT) or sludge age: It is also the main basis for the design and operation of the aeration tank, which affects the pool capacity and effluent quality of the aeration tank;

3. Activity of activated sludge: a comprehensive description of the adsorption, aggregation, degradation and sedimentation properties of activated sludge. It affects the residence time of sludge in the sedimentation tank, the concentration of reflux sludge and the setting of the regeneration tank.

4. Dissolved oxygen (DO): It is a comprehensive indicator of microbial use of oxygen to degrade organic pollutants, microbial oxidation rate and oxygenation effect of the external environment on the water body. It is a response of microorganisms to maintain their normal physiological activity.

5. Utilization rate of oxygen: it is related to the form of the aeration tank and the form of the aeration device;

6. Reflux sludge ratio: it directly affects the power consumption of reflux sludge and the concentration of mixed liquid sludge;

7. Mixed liquid sludge concentration: it directly affects the volume of the aeration tank and the sewage treatment effect.

Temperature, pH, dissolved oxygen, nutrients, organic load, toxic substances, and much more.

The activated sludge has a disintegration phenomenon, which may be due to too much return flow or too much aeration (or a disguised result of low COD in the influent water). If it is the first reason, you can adjust the return flow rate to a smaller one size and replace it with a smaller return pump. The second reason is to reduce the aeration rate, reduce the DO value, or increase the COD concentration of the influent water (in extreme cases, nutrients can even be added to ensure the activity of the sludge).

1.Maintain a reasonable amount of aeration, and operators frequently check dissolved oxygen values throughout the entire basin.

2.Reasonable and effective dosing of nutrient sources.

3.Reduce the inflow of such toxic substances, and remove the toxic or inert substances accumulated in the activated sludge through sludge discharge in time. In addition, increasing the residence time is also an important way to deal with inert substances and refractory organic compounds, and many refractory substances such as benzene compounds and printing and dyeing wastewater need to increase the residence time of wastewater in the biochemical system in order to treat it more sideways.

4.Problem and phenomenon 5: Activated sludge floating.

The methods that can be taken are: 1. Increase the reflux ratio. 2. Control the DO of the aeration tank, which should not be too high or too low, and reduce the DO value as much as possible under the condition of meeting the DO required for nitrification. 3. Increase carbon sources.

First of all, what is the type of wastewater and the characteristics of water quality.

What to reduce aerobic aeration is pure nonsense, this depends on how you O section do situation, rather than blindly reducing, to ensure the effect of O section nitrification, if nitrification is not done, how to denitrify?

In the case of denitrification, the reflux ratio should be increased appropriately according to its own situation, of course, one point is very important: whether there is enough carbon source for denitrification? If not, you need to add a carbon source appropriately, if the carbon source is insufficient, no matter how much you increase the reflux, it is useless.

The above is just a general situation, and the actual operation should be decided according to the on-site situation for reference.

Reduce aerobic aeration and strengthen 2 sedimentation and sludge discharge.

What process do you have, oxidation ditch? Can you tell us what you think?

Are you talking about preventing the denitrification of the sediment from sinking and floating?

Answer]: b

Denitrification refers to the process of reducing nitrite and nitrate to nitrogen under the condition of infiltration, hypoxia and consumption of organic matter under the action of denitrifying bacteria.

<>1. The denitrification reaction in sewage treatment is a part of the biological denitrification treatment method, which is operated in conjunction with nitrification treatment.

2. Sewage nitrification-denitrification denitrification treatment is a sewage microbial denitrification treatment method that uses nitrifying bacteria and denitrifying bacteria. This method is divided into two stages: nitrification and denitrification, under aerobic conditions, nitrogen-containing substances (including organic nitrogen and inorganic nitrogen) are converted into nitrate by nitrifying bacteria in sewage, and then under anoxic conditions (dissolved oxygen, nitrifying bacteria are used to reduce nitrate to gaseous nitrogen. The nitrification reaction can be either one-stage nitrification or two-stage nitrification.

In the primary nitrification, the carbon oxidation process is also carried out; In secondary nitrification, the carbonization and nitrification processes can be carried out in separate pools. The nitrification tank can take the form of an aeration tank. The two-stage biological denitrification method is an effective chain method for microbial denitrification of sewage, and has been widely used as a standard biological denitrification method.