In water pollution treatment, what is the SS removal rate of the hydrolysis acidification tank?

There is no SS removal index in the hydrolysis acidification tank, and the effluent SS with stirring is 500-1000mg L, and the SS without stirring is generally less than 100mg L. The removal rate of coagulation sediment BOD should be determined according to the water quality, it is best to do a small test, the actual removal rate is 80-90% of the small test removal rate, and if you do not do a small test, you can either take the experience of the same or similar wastewater you have done, or take a look at the articles on similar wastewater and then take the value.

The main effects of the hydrolysis acidification tank on SS are interception, adsorption and degradation. The removal rate can be completed by 60% in the retention and adsorption phases, and the degradation rate is about 5-10% at 5 hours in the hydrolysis process.

The SS removal rate of the hydrolysis acidification tank depends on the influent water quality and treatment process, but in general, the SS removal rate is between 10% and 50%.

1. The function of the hydrolysis acidification tank is to improve biochemistry, which may not necessarily remove SS; It is necessary to support the biochemical treatment process to effectively remove SS and BOD;

2. Different kinds of water are treated, and the same process effect is different.

3. The coagulation sedimentation tank mainly removes SS, which may not necessarily remove BOD, and the sedimentation tank design process is different, and the removal rate is also different.

and the effect and technical transformation of hydrolysis and acidification treatment of domestic sewage**.

Perhaps the answer can be found.

There is no SS removal index in the hydrolysis acidification tank, and the effluent SS with stirring is 500-1000mg L, and the SS without stirring is generally less than 100mg L.

Technical introduction: Hydrolysis refers to the biochemical reaction carried out outside the cell before organic matter enters the microleakage reflux biological cells. Microorganisms complete biocatalytic reactions by releasing extracellular free enzymes or immobilized enzymes attached to the outer wall of the cell.

Acidification is a typical fermentation process, and the metabolites of microorganisms are mainly various organic acids.

Mechanistically speaking, hydrolysis and acidification are two stages of the anaerobic digestion process, but the treatment purpose of hydrolysis acidification is different in different processes. The purpose of hydrolysis in the hydrolysis acidification-aerobic biological treatment process is mainly to convert the insoluble organic matter in the original wastewater into Xiaochai dissolved organic matter, especially in industrial wastewater, mainly to convert the organic matter that is difficult to biodegrade into easily biodegradable organic matter, so as to improve the biodegradability of the wastewater and facilitate the subsequent aerobic treatment. Considering the energy consumption of the subsequent oxygen treatment, hydrolysis is mainly used for the pretreatment of low-concentration refractory wastewater.

The purpose of hydrolysis acidification in the mixed anaerobic digestion process is to provide a substrate for methane fermentation in the mixed anaerobic digestion process. The acid-producing phase in the two-phase anaerobic digestion process separates the acid-producing and methanogenic phases in the mixed anaerobic digestion to create their own optimal environment. <>

In general, the removal rate of hydrolysis acidification is directly related to the quality of wastewater. The removal rates of BOD and ammonia nitrogen are relatively high, but COD and TP are generally not high.

BOD can easily reach 30%, and better can reach 50%, or even more;

Ammonia nitrogen will increase after hydrolysis and acidification;

COD often falls below 30% or even below 10%;

TP usually cannot be lowered.

Seeing the relevant data, the removal rate of COD BOD ammonia nitrogen TP in the hydrolysis acidification tank is about 50%, and some related columns are also cited, I want to know what the removal efficiency of hydrolysis acidification in the actual project is...

It is recommended to be located behind the primary sedimentation tank, but the hydrolysis tank is usually not high, the removal rate of 20% is very good, and some wastewater will increase after hydrolysis, so the removal rate of hydrolysis is better set a little lower, otherwise it will not be very troublesome You need to emphasize the hydrolysis efficiency of the hydrolysis tank.

In general, the removal rate of hydrolysis acidification is directly related to the quality of wastewater. The removal rate of biochemical BOD and ammonia nitrogen is relatively high. BOD can easily reach 30%, and even better can reach 70-80% because of the decomposition of organic matter, ammonia nitrogen will increase after hydrolysis and acidification;

COD often falls below 30% or even below 10%;

TP usually cannot be lowered.

Hydrolytic acidification. The actual removal rate of COD in the pool is generally 30-40% is very high, but there is often such a removal rate that has anaerobic methane production.

In the case of the case, the low 10-20% or even almost none are removed.

However, the general purpose of our hydrolysis acidification is to break the chain macromolecules and improve the biodegradability of wastewater, and the removal rate of ten or twenty percent is not our main purpose, so for the hydrolysis acidification tank, we do not have to worry about how much COD is removed, but whether there is an effect, BOD? Do I need hydrolysis and acidification removal? If it's to remove BOD, then what do you have to spend money on hydrolysis and acidification?

Ammonia nitrogen. On the contrary, if the organic nitrogen content of the influent water is high, then it will be ammoniated, resulting in an increase in ammonia nitrogen in the effluent, which is also normal.

There is no removal rate of TP, and the general biological P removal relies on polyphosphate bacteria to absorb P excessively, and discharge it through mud discharge, so as to achieve the purpose of removing P.

Sedimentation tanks. The low removal rate of suspended solids is due to the following reasons:

1.The coagulation effect is not good;

2.The hydraulic load is too large, or the flow velocity is too large, or the residence time hrt is too short;

3.There are unfavorable conditions, such as the temperature difference caused by the turning of the pool, etc.

Solution:1Strengthen the pre-coagulation process: appropriately adjust the coagulant and flocculation wax sedan agent.

dosage; adjustment of the hydraulic conditions of coagulation; Adjust the pool residence time of coagulation;

2.Load reduction: control the inlet water flow; increase pool capacity; adding inclined plate devices, etc.;

3.Control the occurrence of unfavorable conditions: pay attention to the temperature difference of the summer sedimentation tank.

Coagulation sedimentation tank is a common water treatment equipment, which is used to remove suspended solid substances, including suspended particles, suspended organic matter, etc. SS (suspended solids) is a general term for suspended particulate matter in water, including mud and sand, microorganisms, algae, zooplankton, etc.

The removal rate of SS in the coagulation sedimentation tank is affected by a variety of factors, including water quality characteristics, coagulant type and dosage, sedimentation tank design parameters, etc.

1.Water quality is particularly terrestrial: the nature and concentration of suspended solids in the water will directly affect the removal effect of the coagulation sedimentation tank. Different types of suspended solids have different characteristics, and the smaller and finer the suspended solid particles, the more difficult it is to remove.

2.Coagulant selection and dosage: The type and dosage of coagulant will affect the removal effect of the coagulant sedimentation tank.

Commonly used coagulants include polyaluminum chloride (PAC), aluminum sulfate, polyacrylamide, etc., which need to be selected to consider the water quality characteristics and expected removal effect, and to dosing in the appropriate amount.

3.Sedimentation tank design parameters: The design parameters of the sedimentation tank also have an impact on the SS removal rate.

Including the hydraulic retention time of the sedimentation tank, the shape and size of the sedimentation tank, etc. Increasing the hydraulic retention time, providing a good sedimentation area and a reasonable water flow distribution can improve the removal effect of SS.

Coagulation sedimentation tanks do not completely remove all SS and can usually achieve some removal results, but the specific removal rate will vary depending on the equipment and water treatment process. In practical applications, process design and equipment selection are also required to meet water treatment requirements on a case-by-case basis.