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Abnormal symptoms

Analysis and diagnosis

solutions

The aeration tank is smelly

The oxygen supply in the aeration tank is insufficient, the DO value is low, and the ammonia nitrogen in the effluent is sometimes high

Increase the oxygen supply to make the DO mass concentration of the aeration tank higher than 2mg/L

Black sludge

If the DO of the aeration tank is too low, the anaerobic decomposition of organic matter releases H2S, which reacts with Fe to form FeS

Increase oxygen supply or increase the amount of sludge returned

Sludge whitening

Filamentous bacteria or sessile ciliates multiply

If there is sludge swelling, refer to swelling countermeasures for other symptoms

The pH value of the inlet water is too low, the pH of the aeration tank is <6, and a large number of filamentous molds are formed

Increase the pH of the feed water

A large piece of black sludge floats up in the sedimentation tank

The partial mud in the sedimentation tank is anaerobic, producing methane and CO2, and air bubbles are attached to the mud particles to float above.

Prevent dead spots in the sedimentation tank, flush and clean with compressed air in the dead spots after the mud is discharged

The mud level of the secondary settling tank is raised, the initial effluent is particularly clear, and the sludge overflows in layers when the flow is large

SV>90%, SVI>200mL/s, filamentous bacteria are dominant in the sludge, and the sludge swells

Chemical methods such as adding liquid chlorine, sodium hypochlorite, and increasing pH to kill filamentous bacteria; adding granular charcoal, clay, nitrified sludge and other activated sludge "weight agents" to increase DO; interstitial water ingress

The mud level of the second settling pond is too high

Filamentous bacteria have not grown excessively, and the MLSS value is too high

Increase mud discharge

Accumulation of deflocculated sludge layer on the surface of secondary sedimentation tank

The micro-animals die, the sludge deflocculates, the effluent water quality deteriorates, the COD and BOD rise, the OUR is far below 8mg02/(gVSS·h), the concentration of toxic substances in the influent water is too high or the pH value is abnormal

Stop water intake and add nutrients after the sludge is discharged. It is possible to introduce domestic sewage to rejuvenate or introduce new sludge strains

There are fine sludge floating outside in the second settling tank

The sludge lacks nutrients; the ammonia nitrogen concentration in the influent is high, and the C/N is inappropriate; the pool temperature exceeds 40℃; the wing wheel speed is too high to break the flocs

Add nutrients or introduce high BOD wastewater to make F/M>0.1, stop an aeration tank

The supernatant of the secondary sedimentation tank is turbid, and the effluent quality is poor

High sludge load, incomplete oxidation of organic matter

Reduce the flow of water in, reduce the sludge discharge

Scum appeared on the surface of the aeration tank, like thick porridge covering the surface

Excessive growth of Nocardia or ciliates in the scum or excessive detergent content in the influent water

Remove the scum, avoid the scum to continue to circulate in the system, and increase the sludge discharge

The sludge is immature, the flocs are thin, the effluent is turbid, and the water quality is poor; there are many small motile flagellates

The composition and concentration of the water have changed too much, the nutrition in the wastewater is unbalanced or insufficient; the wastewater contains toxic substances or the pH value is inappropriate

Balance the composition, concentration and nutrition of wastewater, and appropriately supplement the lack of nutrients

Difficulties in sludge filtration

Sludge deflocculation

Dispose of according to different situations

Mud cakes after sludge dewatering

Organic spoilage

Timely disposal of sludge

Insufficient addition of coagulant

Increase the dose

Excessive foam in aeration tank, white color

Too much detergent in the water

Drop defoamer

The aeration tank foam is not easy to break and sticky

The influent load is too high and the decomposition of organic matter is not complete

Reduce load

Aeration tank bubble tea or gray

The sludge is aging, the sludge age is too long, and the deflocculated sludge is attached to the foam

Increase mud discharge