What to do if the activated sludge particles are too small and not easy to settle 50

What is the water quality? If it's living water, then there's something wrong with your biochemical system. Here's why:

1. The sludge color is abnormal, which may be caused by the fact that some microorganisms have died and the DO is not enough or the review is too high. The normal color is earthy yellow. Second, the SV30 is a bit high.

I don't know if your aerobic pond is using sludge or contact oxidation or whatever. But the SV30 is a bit high relative to both. If it is an activated sludge method, you need to consider whether to increase the reflux ratio.

For contact oxidation, your microorganisms have been deflocculated, and there are many reasons for this. I won't list them all. 3. The effect of dosing PAC is poor, is it used with PAM?

If the effect is still poor, it may be that there is a problem with your dosage and you need to try again. Or maybe there's something wrong with your design, like the upwelling velocity of the water or something. If it is industrial water, the flocculation effect is poor, you can consider whether you need a more medium flocculant.

The effect of the PAC seems to me not to be very good. Drying is required for the determination of MLSS.

If the shape of the drifting mud is layered, it is necessary to check whether the poison exceeds the standard, and the large floating may be local anaerobic, and there are several reasons for the small particles: the water temperature is too high, the C n is uncomfortable, and the nutrients are insufficient. Cloudy supernatant indicates a high load.

I don't know what method you used to treat it, the water quality becomes anaerobic and dark after treatment, maybe you treat the high nitrate content in the water, and the denitrification reaction occurs in the primary sedimentation tank. Increase the sludge return volume and try it.

Brown is a normal color, and the load of 600-1000 is not too high, so it may be a problem with the strain. In addition, the flocculation effect is poor, and it is necessary to change the flocculant.

Brown is normal, but it becomes darker if the supply is insufficient. Increase aeration appropriately.

If the MLSS can be measured, the SVI can be calculated, and if the SVI is greater than 200, then the activity of the sludge is problematic and can be replaced.

The load is too high and it needs to be pre-treated.

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Try it for ferric sulfate.

Summary. Hello dear! <>I'm your exclusive answerer, Xixi<> I've already sorted out your questions<>

I'm very happy I'm here for your question, dear, according to your question As follows<> the reason for the small sludge settlement ratio is the aging of sludge. SV30 is less than 10, and the MLSS is so high, then SVI is very small. It is estimated that the sludge aging phenomenon has occurred.

When making SV, you should not pay attention to the final value, but also observe its settlement process. See if the supernatant has some tiny flocs. There is also the case where the content of inorganic components is too high.

What is the reason for the small sludge settlement ratio?

Hello dear! <>I'm your exclusive answerer, Xixi<> I've already sorted out your questions<>

I'm very happy I'm here for your question, dear, according to your question As follows<> the reason for the small sludge settlement ratio is the aging of sludge. SV30 is less than 10, and the MLSS is so high, then SVI is very small. It is estimated that the sludge aging phenomenon has occurred.

When making SV, you should not pay attention to the final value, but also observe its settlement process. See if the supernatant has some tiny flocs. There is also the case where the content of inorganic components is too high.

What measures are in place? Is it okay to increase the amount of aeration?

Yes, increasing the aeration capacity will effectively alleviate the sludge sedimentation ratio.

Sludge swelling has occurred and the following measures can be taken:

Measure A, drug treatment, can kill filamentous bacteria of chlorine, ozone, hydrogen peroxide, etc., when the effective chlorine is 10-20mg L, it can effectively kill Chlamyda, thiobacterium: higher than 20mg L, may cause harm to floclo-forming bacteria, therefore, when using chlorine, it must be reasonably added according to the allowable range of dosage. Oxidants such as ozone and hydrogen peroxide have a killing effect on Colement only under high measurement conditions.

Measure B, improve and improve the flocculation of activated sludge, add aluminum sulfate, ferric chloride, polymer coagulant and other flocculants at the inlet of the aeration tank.

Measure c, improve and improve the sedimentation and compactness of activated sludge. Clay, slaked lime, raw sludge or digested sludge are added to the inlet of the aeration tank.

Measure D, increase the amount of reflux sludge, through this measure, the causative substances of high viscous swelling, i.e., polysaccharides, are reduced, and in most cases, the high viscous swelling can be relieved. In places where conditions permit, the endogenous respiration phase can also be carried out before the reflux sludge, which improves the ability of the floc to form bacterial groups to take up organic matter and compete with filamentous bacteria, and the swelling of filamentous bacteria can also be inhibited. During the aeration process, nutrients such as chlorine and phosphorus can be added to strengthen the sludge activity.

Measure e, so that the wastewater is often in a fresh state, to prevent the formation of anaerobic state, if conditions to take pre-aeration measures, so that the wastewater is often in a pre-aeration state, blowing away hydrogen sulfide and other harmful gases, and to avoid the use of thiosiobacteria to proliferate.

Measure f, strengthen aeration, increase the concentration of mixing liquid, and prevent the anoxic or anaerobic state of the mixing liquid, that is, it is either local or temporary anaerobic, which is not conducive to the physiological activities of flocculents, but is conducive to the proliferation of filamentous bacteria.

Measure g, under favorable conditions, consider changing the water temperature, the water temperature below 15 degrees Celsius is prone to highly viscous swelling, while filamentous swelling is more likely to occur above 20 degrees Celsius.

Measure H to reduce the residence time of sludge in the secondary sedimentation tank and prevent the formation of anaerobic state. Measure 1, adjust the sludge load, the operating experience shows that if the sludge load is exceeded, filamentous bacterial sludge swelling is prone to occur.

Measure J, adjust the nutrient balance in the mixture, that is, to ensure the requirements of BOD:N:P=10:5:1, when the mixture loses the nutrient balance, the expansion of highly viscous sludge often occurs.

Measure K, to control the proliferation of filamentous bacteria, for the activated sludge that has produced a large number of C. globuliformis, use copper sulfate with a concentration of 50 mg L to maintain a residual concentration of 5 mg L, which can inhibit the proliferation of Chlamydia spp.

In actual operation, the above types of methods complement each other, after the sludge expansion occurs, first of all, through the observation of the phenomenon, with the help of physical and chemical analysis methods, to determine the type of expansion and the cause of the occurrence, the right medicine, take effective control measures.

There are many reasons, such as denitrification caused by untimely sludge discharge, excessive organic load, and so on.

First, if it is settled and then floated, there are usually two reasons:

1.Overaeration: The fine bubbles are too late to be released, and the sludge is generally floated to the surface of the water in about 5min;

2.When denitrification occurs, the sludge is generally floated to the surface of the water in about 30min;

2. If the mixture cannot be separated from the liquid and solid, it is likely to be caused by sludge expansion, which can be confirmed by microscopic examination.

The dissolved oxygen content can be detected to ensure that it is within the appropriate process range.

Is there dissolved gas at the inlet of the sedimentation tank? If there is, it will also make a large amount of sludge float.

1. The sludge load is too low, and 2. The sludge swells.

3. Sludge poisoning.