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Anonymous users2024-02-15Sludge load refers to the amount of pollutants that a unit mass of activated sludge can withstand per unit of time. The sludge load in terms of microbial metabolism is the F m ratio in kgcod (kg sludge·d) or kgbod5 (kg sludge·d). For example, the sludge load of BOD5 is expressed in the following units:
kg(bod )/kg(mlss) ·d]
Calculation: ns=f m=qs (vx).
where ns – sludge load, kgcod(bod) (kg sludge. d);
Handling system influences.
The size of the sludge load is essentially the amount of nutrients supplied to the unit mass of activated sludge. The sludge load is large, the activated sludge growth rate, the organic matter removal rate and the oxygen utilization rate are all high, but the sludge load is large, and the effluent of the treatment system is not easy to qualify, and at the same time, due to the strong microbial activity;
The sludge is not easy to coagulate and settle, and it is not well separated from water. If the sludge load is small, the opposite is true. Therefore, in order to obtain a good treatment effect, it is necessary to control the appropriate sludge load according to the specific treatment process.
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Anonymous users2024-02-14Sludge load (ns) is the amount of contaminants removed per unit mass of activated sludge per unit of time. The meaning of sludge load in terms of microbial metabolism is the ratio of f m, in kgcod (bod) (kg sludge. d)
At different stages of sludge growth, the sludge load is different, and the purification effect is also different, so sludge load is one of the main parameters in the design and operation of the activated sludge method. Generally speaking, when the sludge load is within the range, the removal rate of BOD5 can reach more than 90, and the SVI is 80-150, and the adsorption and sedimentation performance of sludge are good. Calculation method of sludge load:
NS F m QS (VX) where ns – sludge load, kgcod(BOD) (kg sludge. d);q - water intake per day, m3 d; S - COD (BOD) concentration, mg L; v ——effective volume of aeration tank, m3; x – sludge concentration, mg l.
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Anonymous users2024-02-13That is, the amount of organic matter per kilogram of anaerobic activated sludge that is subjected to per kilogram per day, in kilograms of COD (kilograms vss?).days), the volumetric load is determined on the basis of the sludge load during the operation of the anaerobic reactor.
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Anonymous users2024-02-12The calculation formula is generally as follows: sludge load (kgcod kgmlss·d) = (q in c in-q e c e) mlss.
Sludge loading is an important parameter in biological treatment systems and can help assess the stability and efficiency of the system. The sludge load calculation formula is calculated based on various factors such as sludge reflux ratio, influent COD concentration, etc.
Among them, Q in is the influent flow, C in is the COD concentration of the influent water, Q E is the sludge return flow, C E is the COD concentration in the reflux sludge, and MLSS is the concentration of suspended solids in the mixed liquid.
In practical applications, it is also necessary to consider the influence of other factors on the sludge load, such as water temperature, pH value, etc. Correct sludge load calculations can help to promote the proper functioning of biological treatment systems and have a positive impact on subsequent treatment results.
In addition, critical parameters such as influent COD concentration and MLSS need to be monitored in time to ensure the accuracy of the calculation formula. It is recommended to use ** monitoring instruments for real-time measurement of COD concentration in influent water and suspended solids concentration in the mixture, and integrate the obtained data into the control system for automatic calculation of sludge load.
In practice, it also needs to be adjusted according to the specific situation. For example, when the system is in special circumstances (such as water inlet changes, reflux ratio rock search, etc.), the calculation formula needs to be recalculated to ensure accuracy.
In general, the sludge load calculation formula is one of the important parameters that must be used in the operation of the sewage treatment system. Only by correctly calculating the sludge load can the stability and efficient operation of the biological treatment system be guaranteed.
In addition, the following points need to be paid attention to when calculating the sludge load:
1.The formula for calculating sludge load in different bioreactors will be different, and it is necessary to choose the correct formula according to the actual situation.
2.Different wastewater treatment processes require different control and regulation of the sludge load during operation.
3.In practice, it is also necessary to pay attention to key parameters such as controlling the reflux ratio and sedimentation time to maintain the stability and efficient operation of the system.
4.The sludge load calculation formula is only an indicator to measure the treatment capacity of the bioreactor, and it is also necessary to comprehensively consider the treatment effect, operating costs, equipment maintenance and other factors to arrive at the best wastewater treatment plan.
In short, accurate calculation of sludge load is the basic premise to ensure the efficient and stable operation of the sewage treatment system. At the same time, it is necessary to flexibly apply it according to the actual situation, continuously optimize the treatment plan, and improve the treatment effect and economy.
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Anonymous users2024-02-111. Volumetric load is an index to measure the efficiency of the aeration tank.
2. Sludge load refers to the amount of pollutants that can be borne by activated sludge per unit mass in a unit time.
3. Relationship: The sludge load and volume load are too low, which can effectively reduce the organic matter content in the sewage, but at the same time, the activated sludge is in a state of peroxidation, and the sedimentation performance is poor, resulting in an increase in the content of suspended solids in the effluent.
Five days of biochemical oxygen demand per kilogram of activated sludge per unit time in an aeration tank. The unit of measurement is usually expressed as kg (.
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Anonymous users2024-02-10Sludge load refers to the amount of organic matter borne by a unit weight of activated sludge in an aeration tank per unit of time, and volumetric load refers to the amount of organic matter per unit of effective aeration volume in a unit of time.
In order to carry out normal physiological activities, activated sludge microorganisms first require that their surrounding environment contain enough BOD5, and under aerobic conditions, a part of the organic matter is catalyzed into stable substances such as carbon dioxide and water, and at the same time, it can be proliferated by itself.
Relationship: If the sludge load and volume load are too low, although the organic matter content in the sewage can be effectively reduced, the activated sludge will be in a peroxidation state and the sedimentation performance will also deteriorate, resulting in an increase in the suspended solids content of the effluent.
If the sludge load and volume load are too high, it will cause incomplete oxidation of organic matter in the sewage and deterioration of effluent quality. In addition, the relationship between sludge load and sludge expansion is directly related, not only the sludge load and volume load are too high to cause sludge expansion, but for different water quality, various parameters including sludge load of the aeration tank must be determined through operation practice.
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Anonymous users2024-02-09Calculation method of sludge load:
ns＝f/m＝qs/（vx）
where ns – sludge load, kgcod(bod) (kg sludge. d);
q - water intake per day, m3 d;
S - COD (BOD) concentration, mg L;
v ——effective volume of aeration tank, m3;
x – sludge concentration, mg l.
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Anonymous users2024-02-08ns=(k2*se*f)/ƞ
ns——sludge load, kgbod5 (kgmlss·d);
k2 - coefficient, for urban sewage is generally between;
SE - BOD5 concentration in treated water, mg L;
F - the ratio of volatile suspended solids of the aeration tank mixture to the suspended solids of the mixed liquid, that is, MLVSS MLSS, which is generally taken between urban sewage;
- Removal rate of BOD5 from raw sewage, i.e. (sa-se) sa.
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Anonymous users2024-02-07ns f m qs (vx) formula.
NS – Sludge load, kgcod(bod) (kg sludge. d);
q - water intake per day, m3 d;
S - COD (BOD) concentration, mg L;
v - effective volume of the pool, m3;
x – sludge concentration, mg l.
Volume load nv f m qs v
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Anonymous users2024-02-06ns=(k2*se*f)/ƞ
ns——sludge load, kgbod5 (kgmlss·d);
k2 - coefficient, for urban sewage is generally between;
SE - BOD5 concentration in treated water, mg L;
F - the ratio of volatile suspended solids of the aeration tank mixture to the suspended solids of the mixed liquid, that is, MLVSS MLSS, which is generally taken between urban sewage;
- Removal rate of BOD5 from raw sewage, i.e. (sa-se) sa.
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