(1) When the activated sludge has good purification performance, the microorganisms that appear are bell worms, isoclids, cilia, cap ciliates, polyconstriction worms and various metazoans and straw insects and other sessile organisms or creeping organisms, when the number of separations of these organisms reaches more than 1000/mL, accounting for more than 80% of the number of the whole organism, it can be concluded that this activated sludge has a high purification effect.

(2) When the purification performance of activated sludge deteriorates, there are many fast-swimming organisms such as polybozosis, lateral trichomoniasis, house trichomoniasis, and beans. At this time, the floc was very broken, about 100um, laughing. In severe deterioration, only polybodia, house trichomoniasis, appear. In extreme deterioration, neither protozoa nor metazoans appear.

(3) The organisms that appear when the activated sludge is restored from a deteriorating state are slow-swimming or creeping organisms such as diffuser, oblique, oblique, and sharp caterpillar. These microorganisms have been observed to become dominant organisms for about a month.

(4) The organisms that appear when the activated sludge fraction is disintegrated are carnipods such as slugs, simplification, and radiation amoeba. When tens of thousands of these organisms appear, the flocs become smaller, making the treated water turbid. When these organisms are found to be overgrown, this phenomenon can be suppressed to some extent by reducing the amount of backflow sludge and the amount of air supply.

(5) The microorganisms that appear when the activated sludge expands are Chlamyformus globulus, various molds, etc., these filamentous microorganisms cause sludge to swell, and when the SVI is above 200, these filamentous microorganisms are filamentous. There are fewer microscopic animals in expanded sludge than in normal sludge.

(6) The microorganisms that appear when dissolved oxygen is insufficient are thioclobacterium burnetii. These microorganisms are adapted to survive when dissolved oxygen concentrations are low. These microorganisms appear, and the activated sludge is black, putrefined, and smelly.

(7) The microorganisms that appear during over-aeration are the dominant organisms if the over-aeration time lasts for a long time.

(8) When the concentration of wastewater is too low, a large number of microorganisms are migratory insects.

(9) Microorganisms that occur when BOD load is low. Episcale insects, scale insects, rotifers, oligocaterpillars, etc. are the dominant organisms, and these organisms are also indicators of nitrification in many cases.

(10) Organisms that appear during shock loads and poison influx. Because protozoa respond more quickly to changes in environmental conditions than bacteria, the effects of shock loads and poisons on activated sludge can be seen by observing changes in protozoa. Among the protozoa, the cilia is most sensitive to shock loads and poisons, and when there is a sharp decrease in the number of cilia, it indicates that an impact load and a small amount of poison have flowed.

When there are many marginal hairs, the treatment effect is good, and the effluent BOD5 and turbidity are low. These marginal hairy microorganisms (such as Bellworm microfolia, Bellworm octocarpus, Bellworm groove Worm, Bellworm Velata, Bottleworm, Microdisc Cover Worm, Monoscopic Worm) are fixed on the flocculent and turn with it, which is also mixed with some crawling ciliates, wandering worms, sharp caterpillars, Pycheolithales, etc., which indicates that the activated sludge is a high-quality and mature activated sludge. Small-mouthed bellworms are often the dominant strains when they are well treated in domestic sewage and industrial wastewater. If a large number of flagellates are present and there are few birthing limbles, it indicates that the purification effect is poor. The appearance of a large number of free-swimming ciliates indicates that the purification effect is not very good, and the turbidity of the effluent rises. If there are mainly sessile ciliates, such as bell insects, tired branch insects, cover insects, rotifers, and oligochaetes, the water quality is well defined, the effluent is clear and transparent, and the phenolic removal rate is more than 90%. The presence of a large number of rhizopods is often a sign of sludge poisoning. For example, in the treatment of domestic sewage, the appearance of a large number of tired branch insects is a sign of sludge expansion and defloculation. In printing and dyeing wastewater, the retiring branch insect is used as an indicator organism of sludge normalcy or improvement. The presence of bell worms in petroleum wastewater treatment is an ideal effect. The presence of an excess of rotifers is a sign that the sludge is about to expand. In addition, in some sludges that are not suitable for the growth of protozoa, the treatment effect is mainly judged by the size and number of myceliums.

Microorganisms play a very important role in the debugging process, and the quality of the activated sludge can be found according to the microorganisms in the activated sludge through microscopic inspection, and its indication functions are:    

(1) When there are many marginal hairs, the treatment effect is good, and the effluent BOD5 and turbidity are low.    

Such as the small-mouth bell worm, the eight-bell worm, the groove bell worm, the bell worm, the bottle tired branch worm, the microdisc cover worm, the monoscopic worm, these species of the order of the marginal hairs are fixed on the flocculent, and with the window and turned, which is also mixed with some crawling perchworms, wandering insects, sharp caterpillars, tracheal leaf worms, etc., which shows that it is a high-quality and mature activated sludge.

(2) Small-mouthed bellworms are often the dominant strains when domestic sewage and industrial wastewater are well treated.    

(3) If a large number of flagellates appear, and there are few marginal hairs, it indicates that the purification effect is poor.    

(4) The appearance of a large number of free-swimming ciliates indicates that the purification effect is not very good, and the turbidity of the effluent increases.    

(5) If there are mainly stalk ciliates, such as bell insects, tired branch insects, cover insects, rotifers, and oligochaetes, the water quality is well defined, the effluent is clear and transparent, and the phenolic removal rate is more than 90%.    

(6) The occurrence of a large number of rhizopods is often a manifestation of sludge poisoning.    

(7) For example, in the treatment of domestic sewage, a large number of tired branch insects appear, which is a sign of sludge expansion and defloculation.    

(8) In printing and dyeing wastewater, the tired branch insect is used as an indicator organism of sludge normal or improvement.    

(9) The appearance of bell worms in petroleum wastewater treatment is an ideal effect.    

(10) The appearance of excessive rotifers is a sign that the sludge is about to expand.

In addition, in some sludge that is not suitable for the growth of protozoa, the treatment effect is mainly judged by the size of the mycelium and the quantity