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- COD AND BOD REMOVAL
- The main applications of polyacrylamide(PAM,FLOCCULANT)
1, flocculation: PAM allows suspended material by charge neutralization, bridging adsorption, since flocculation.
2, adhesion: through mechanical, physical, chemical effect, since adhesion.
3, lowering resistance: PAM can effectively reduce fluid friction, the water can be added to trace PAM 50-80% reduction in resistance.
4, thickening: PAM have a thickening effect under neutral and acid conditions, when the PH value above 10 PAM easy hydrolysis. When semi-mesh structure, thickening more obvious.
PAM usage instructions
1, the number of washing with the use of cationic polyacrylamide can be set between thirty kilograms to one hundred and ten kilograms; the amount of the chemical industry waste water is generally between fifty to one hundred and twenty kilograms; dyeing industry wastewater and paper industry wastewater difficult to deal with, should increase the number of use, use the number provided in the one hundred to three hundred kilograms more reasonable, electroplating wastewater industry and general industrial water are generally not more than fifty kilograms. Note the number of the number :( these types of industries are using thousands of tons of wastewater each).
2, sewage treatment methods depending on the mud off with a flocculant is not the same.
If the process the body uses biochemical methods, that is, the remaining sludge dewatering (which may contain part of the primary sedimentation mud), just as the sludge dehydrating agent of cationic PAM can.
If the process the body uses physicochemical methods, such as an enhancement, loading magnetic separation process, the general is to add PAC quenched, and then add an anionic flocculant, and finally add the cationic flocculant dehydration. Specific dosage should be based on wastewater quality.
There are also many sewage treatment station, sludge dewatering directly added to PAC or other inorganic flocculants, the in frame filter, especially electronics factory or a small sewage treatment plant used widely.
PAM at the time as the sludge dehydrating agent used generally in the ratio of 0.1% and water - 0.2%. Dissolved into a glue-like liquid later, and then added to the sludge mixing investment process.
And sludge ratio is generally 5% --10%, some less, this should be determined based on the concentration of the sludge, it is best to determine the optimal dosage and usage models through field experiments beaker. Different sludge, different agents, the treatment effect of different equipment, different management levels, the sludge is different.
3, sewage treatment plant with a cationic polyacrylamide as sewage sludge dewatering operations agent. In the process and customer communication, the client often asked in the process of sewage treatment sludge dewatering, sludge dewatering agent dosage problems. To know the exact opposite sludge dewatering agent dosage problems, first understand these parameters, the moisture content of the sludge, mud cake moisture content, into the mud, into the dose, dispensing concentration.
Sludge moisture content: the percentage of moisture contained in the sludge weight and sludge ratio is referred to the total weight of the moisture content of the sludge.
Cake moisture content: That is a percentage off the sludge cake moisture contained in the weight of the total weight of the sludge cake moisture content is called.
But also through the following calculation formula
1, dosage mg / L = Dosing quality / process water / Pharmaceuticals concentration
2, treated water dosage dose = treated water m3 / h * dosage g / m3
3, the amount of dry sludge treated water * = [(1 - sludge moisture content) / (1 cake moisture content)]
4, pharmaceutical consumption per ton of dry mud g / m3 = dosage / dry mud