Sewage treatment is a problem that must be solved by Yunnan environmental protection purification equipment manufacturers. No matter which industry needs sewage treatment, how much do you know about sewage treatment? Xiao Li of Yunnan Environmental Protection Purification Equipment Company will give you a detailed talk.
what are the reasons for the tumbling and turbidity of fine sludge in the secondary sedimentation tank?
The sludge load in aerobic tank is too small, the aeration is too high, and the sludge itself oxidizes, which leads to poor flocculation and scattered sludge structure (turbid water and more suspended matter).
The sludge load in aerobic tank is too large, the dissolved oxygen is insufficient, the adsorption performance of sludge becomes worse, and the organic matter cannot be completely decomposed.
the load of the secondary sedimentation tank is too high, or the gravity flow phenomenon occurs due to uneven water distribution in the secondary sedimentation tank, and the local flow rate is too fast to pick up the sludge.
the reflux ratio of the secondary sedimentation tank is too large, the mud layer of the secondary sedimentation tank is too low, and the mud layer sensed by the water flow is too large (this reason is less).
Excessive sludge discharge in aerobic tank leads to short sludge age in aerobic tank, and newly synthesized sludge flocs are difficult to settle (water is clear and suspended solids are abundant).
The sludge bell in aerobic tank is too long, and the sludge is aging.
The sludge in the aerobic tank is short of nutrients or the ratio of nutrients is uneven (the ratio of N to P is too high).
Sludge bulking occurs in the aerobic tank, and the sedimentation is poor. The sludge layer in the secondary sedimentation tank is high, and the sludge is carried out by the water flow (this will happen if the svi value is too high or too low).
The nitrogen content in the sewage of aerobic pond is too high.
what are the reasons for the scum and mud floating in the secondary sedimentation tank of Yunnan environmental protection purification equipment manufacturer
?
The reflux ratio of the secondary sedimentation tank is small, the sludge retention time is too long, and the sludge is carried up by gas after anaerobic anti-kurtosis.
The aerobic tank enters a large amount of physicochemical sludge and anaerobic sludge, but some of them can't be transformed into scum discharge system.
sludge in aerobic tank is spoiled.
There are many foams in the aerobic tank, which are mixed with sludge/suspended substances and then float in the secondary sedimentation tank.
The aerobic tank has low sludge concentration (high sludge load) or high dissolved oxygen (possible).
The sludge in aerobic tank is aged or too short, with poor flocculation, COD removal rate and treatment effect.
what is the reason of insufficient dissolved oxygen in aerobic tank?
The sludge concentration in aerobic tank rises rapidly or the oxygen consumption increases due to sludge aging.
There are a lot of suspended solids in the effluent of anaerobic tank, which consumes a lot of dissolved oxygen after entering aerobic tank.
the blower fails and stops running or the blower pressure is not enough (this rarely happens).
the effluent COD of anaerobic tank suddenly increases a lot, or the influent water suddenly increases, resulting in a large impact load, which leads to a large load of aerobic tank.
The aeration head is seriously damaged or blocked, and there are many bubbles in the aerobic tank.
what is the reason of sludge bulking in aerobic tank?
The dissolved oxygen in aerobic tank is low or high for a long time (possible).
The sulfide content in raw water or anaerobic effluent is too high, which leads to the proliferation of sulfur bacteria.
the load of aerobic tank is low or high for a long time.
the water temperature in aerobic pool is on the high side.
unbalanced or lack of nutrition (n, p is low).
the problem of influent pH value.
The sludge bell in aerobic tank is too long, and the increase of oxygen consumption leads to insufficient dissolved oxygen.
The aerobic tank of Yunnan environmental protection purification equipment manufacturer appears
The aerobic tank has small sludge load, excessive aeration, self-oxidation of sludge, poor flocculation of sludge, and loose sludge structure (clear, with more fine mud and low COD).
When the sludge load in aerobic tank is too large, the adsorption performance of sludge becomes worse, the organic matter is not completely decomposed, and the sludge structure is scattered (turbid, opaque and high in COD) by microscopic examination.
Excessive sludge discharge in aerobic tank leads to short sludge age in aerobic tank (svi value is 7-12, which is suitable for less fine sludge in secondary sedimentation tank).
The influent of aerobic pond contains toxic substances or the sludge is aged, with long sludge age (turbidity, fine sludge, high COD and many rotifers under microscope).
The nutrient in aerobic pond is insufficient or the proportion of nutrient is unbalanced (N, P is low).
what is the reason why there are a lot of bubbles in the aerobic tank?
raw water contains a lot of surfactant components (substances added in the production process make the foam white, and the bubbles are fine, light and non-sticky).
the tiny bubbles generated after the newly installed aeration head (short-term impact).
a large number of lipid substances or microorganisms are produced during microbial reproduction (the foam is muddy, with large bubbles and stickiness due to the growth and reproduction activities of microorganisms themselves).
sludge anti-kurtosis foam (the bubble beads produced after the aerobic sludge stays in the secondary sedimentation tank for too long are sticky and muddy).
what is the reason for the low removal rate of COO in aerobic tank?
The sludge in aerobic tank is aging, with long sludge age, high sludge load, short sludge age, large return flow and short residence time. The sludge load in aerobic tank is low, and the long-term high dissolved oxygen leads to sludge self-oxidation (low removal and high dissolved oxygen), with more fine sludge, less active sludge, insufficient dissolved oxygen, insufficient nutrients or unbalanced proportion of tube nutrients (too high ratio of N and P). The COD removal rate in anaerobic tank is low, and the anaerobic hydrolysis effect is poor.
what is the reason for the low removal rate of COD in the pond?
the sludge concentration in the anaerobic tank is insufficient (returning biochemical sludge to the anaerobic tank).
A large amount of physicochemical sludge (mostly inorganic substances) enters the anaerobic tank.
The nutrient in anaerobic tank is insufficient or the proportion of nutrient is not balanced.
the water temperature r exceeds the adaptive range of anaerobic microorganisms (more than 4O).
the influent ph exceeds 1.5 or is lower than 6.5.
The retention time of anaerobic tank is too short to reach anaerobic hydrolysis state (design problem).
entering toxic substances.
what is the reason why there are many fine sludge in the supernatant of aerobic tank, and it is difficult to settle when the fine sludge rolls?
The sludge nutrient in aerobic tank is insufficient or the proportion of nutrient is not balanced.
the sludge load in aerobic tank is too high (the effluent of secondary sedimentation tank is turbid, with high COD, and the supernatant of sludge in aerobic tank is finely divided after sedimentation, which is turbid).
The sludge load in the aerobic tank is too low, the aeration is too high, and the fine sludge is generated after the sludge is emulsified by itself (the removal rate of COD in the aerobic tank is low, and the effluent COD is high).
The sludge load in aerobic tank is too low, the sludge retention time is long, and the sludge flocculation is poor due to excessive aeration (the sludge structure is loose but the COD removal rate is high or not low).
how to solve the problem of more suspended solids (sludge) in the pulse effluent of anaerobic tank?
it is necessary to control the physical and chemical sludge in the sedimentation tank to enter the anti-oxidation tank.
add a siphon sludge discharge pipe at the top of the anaerobic tank (it is not recommended to discharge anaerobic bottom sludge).
add polypropylene or polyaluminum to the anaerobic tank.
reduce water inflow or discharge sludge at the bottom of anaerobic tank.
how to solve the problem of sludge bulking in aerobic tank?
firstly, increase sludge discharge to solve the problem of poor sedimentation effect, and then increase sludge concentration after improvement to reduce sludge load.
increase the discharge of sludge in aerobic tank and reduce the sludge age (in severe cases, it will last for about two months).
It is necessary to stabilize the water inflow and keep sufficient dissolved oxygen in the aerobic tank when the hanging water temperature is within a suitable range.
increase the addition of nutrients in aerobic tank.
The height of mud in Zhiguo secondary sedimentation tank can increase the return flow, adjust the water inflow of each secondary sedimentation tank or add aluminum and polypropylene (temporary control measures).
what are the signs of sludge aging in aerobic ponds?
In the initial stage, when the sedimentation ratio is made, the supernatant begins to mix, and fine sludge is suspended, which is difficult to settle. Slowly, floating and floating sludge will appear in the secondary sedimentation tank.
sludge aging will lead to an increase in oxygen consumption of sludge in aerobic tank (pay attention to the signs of sudden drop of dissolved oxygen).
Microscopically, the structure of sludge is scattered, with less filamentous bacteria, more rotifers and less protozoa, and the color of sludge turns pale and yellow.
The foam produced by the sludge in the secondary sedimentation tank is between surfactant foam and biological foam, and it feels a little sticky.
the treatment effect of aerobic tank becomes worse, the oxygen consumption increases, the COD and suspended solids in the effluent increase, and the turbidity increases.
what are the causes of sludge aging in aerobic ponds?
The nutrients are insufficient or unbalanced, the sulfide concentration in the aerobic tank is too high, and the concentrated dissolved oxygen is insufficient.
The sludge age is too long (microscopic examination shows that there are many rotifers in the sludge, the sludge structure is scattered, the effluent is turbid, the supernatant mixed with clear water is still turbid, and there are signs of sludge disintegration).
if the sludge stays in the secondary sedimentation tank for too long, the sludge will become sticky after anaerobic denitrification, resulting in lipid substances (in severe cases, there will be odor in the secondary sedimentation tank).
what is the solution to sludge aging in aerobic tank?
increase the addition of nutrients, discharge more sludge from aerobic tank to increase sludge reflux, reduce the residence time of sludge in the secondary sedimentation tank, appropriately reduce the water inflow of aerobic tank, and then slowly increase the water inflow after the sludge activity improves. What measures should be taken when the aerobic tank stops water inflow maintenance, and how to restore the treatment effect?
increase the return flow of secondary sedimentation tank, reduce the number of fans, increase the addition of nutrients, discharge a small amount of biochemical sludge, gradually increase the water inflow, and increase the number of fans with the increase of water, restore the normal sludge return flow, and gradually restore the normal addition of nutrients.
what will happen if the dissolved oxygen in the aerobic tank is too high for a long time?
aerobic sludge will oxidize itself, and the color of polluted light will turn white.
Aerobic sludge is gradually aging, with loose structure, thin bacterial micelle, more filamentous bacteria and a large number of rotifers.
There are many fine sludge in the supernatant, which makes the treatment effect worse and the effluent turbid.
the color of effluent will become darker (the broken bonds after anaerobic treatment will be reconnected under hyperoxia oxidation).
what will happen if the dissolved oxygen in the aerobic tank is insufficient for a long time?
the sludge turns black, and the treatment effect becomes worse.
with the increase of sludge load, filamentous bacteria are easy to reproduce and sludge bulking will occur.
Microscopic examination of the sludge showed that rotifers proliferated, the ciliates of the bell worm disappeared, the bacterial micelle was opaque
The effluent of Erqin pond was turbid, the denitrification foam of the returned sludge increased, and the sludge and foam became sticky.
Therefore, sewage treatment should be done regularly and timely. If sewage treatment is necessary, please contact Yunnan Environmental Protection Purification Equipment Company.