1. The amount of polyacrylamide flocculant in coal washing can be set between 30 kg and 110 kg; The amount of chemical industry wastewater is generally between 50 and 120 kg; Wastewater from the paper industry is difficult to treat. It is necessary to increase the number of applications. It is reasonable to set the application quantity at 100 to 300 kg. The occupational water consumption of electroplating wastewater and general industrial water shall not exceed 50 kg. Note :(The number of applications for these occupations is per thousand tons of wastewater).
2. The flocculants used for dehydration are different according to different treatment methods.
If the main body of the process uses a biochemical method, that is, the remaining sludge is dehydrated (which may contain part of the initial sediment), only cationic polyacrylamide is required as the sludge dehydrating agent.
If the main body of the process uses physical and chemical methods, such as primary strengthening, loading magnetic separation process, generally add polyaluminum chloride for tempering, then add anionic flocculant, and then add cationic polyacrylamide for dehydration. The detailed dosage should be determined according to the quality of sewage.
polyacrylamide
There are also many sludge treatment stations, and the sludge dehydration can be directly added to polyacrylamide or other inorganic flocculants. This is widely used in plate and frame filter presses, especially in electronics factories.
When the polyacrylamide flocculant is used as a sludge dehydrating agent, the ratio of water to water is usually between 0.1% and 0.2%. The liquid dissolved in gel form is added to the sludge for mixing.
The ratio to sludge is usually 5%-10%, and some are lower. It depends on the concentration of sludge. The dosage and type can first be determined by field beaker experiments. For different sludge, different chemicals, different equipment and different levels of management, the treatment of sludge is different.
3. The sewage treatment plant uses cationic polyacrylamide as the sewage dehydrating agent for sewage treatment. In the process of communicating with customers, customers often ask about the amount of sludge dehydrating agent added in the sludge dewatering process. To understand the quantity of sludge dehydrant more accurately, we must first understand the parameters of the sludge, the water content of the mud cake, the content of the mud, the dosage and concentration of the drug. Drugs.
Sludge water content: The percentage of the ratio of the moisture content in the sludge to the total sludge content is called the sludge water content.
Mud cake water content: The percentage of the ratio of mud cake water content (i.e. mud cake) to the total sludge content is called mud cake water content.
It can also be operated by the following formula
1, dosage mg/L= administration quality/treated water/distribution concentration
2. Add the treated water. The amount of water treated is m3/h *. The dosage of the drug was g/m3.
3. Dry mud amount = treated water amount * [(1 – sludge water content)/(1 – mud cake water content)]
4. The chemical consumption per ton of dry mud is g/m3= the amount of drugs added/the amount of dry mud
The error in the above calculation may be relatively large and only relates to the operation of sewage. The actual consumption of drugs should be carried out in practice.
