Polyacrylamide (PAM) is a water-soluble linear polymer made of acrylamide monomers initiated by free radicals. At the same time, it is also a polymer water treatment flocculant, which can adsorb suspended particles in water, play a link and bridge role between particles, so that fine particles form relatively large flocculants, and speed up the precipitation speed. Misunderstandings of PAM options Many users choose polyacrylamide (PAM) because they believe that the larger the molecular weight of polyacrylamide, the higher the flocculation efficiency, and the better the effect. So is it true that the larger the molecular weight, the better the effect? Not necessarily. The properties of sewage produced by different enterprises are different, some are acidic, some are alkaline water, some are neutral water, some contain oil stains, some contain a lot of organic matter, some contain color, some contain a lot of sediment, and there are various situations. Not one type of polyacrylamide can solve all problems, and all sewage of different water quality can be treated up to standard. It is necessary to select the type through experimental small trials, and then test on the machine to determine the optimal dosage to achieve the effect of low dosage and low cost. Molecular weight and ionization are two important indicators of
polyacrylamide (PAM), so is
polyacrylamide mainly selected by the level of ionization in the industry? Ionism refers to the negative and positive nature of the ionic charge of this chemical reagent, as well as its charge density. The larger the ionic degree, the smaller its molecular weight, and the higher the ionic degree, the higher the price of the product, the ionization degree has an impact on the compactness and moisture content of the flocculate of the product, and further tests are needed to determine the required
polyacrylamide model during the selection process. The longer the polyacrylamide (PAM) dissolution and stirring time, the better? The appearance of
polyacrylamide is white crystalline particles, generally between 60-80 mesh, should be fully dissolved when used, the general dissolution and stirring time should not be less than 30 minutes, and the dissolution and stirring time should be extended when the temperature is low in winter. In many cases, PAM is not fully dissolved due to short dissolution and stirring time, and rapid flocculation cannot be effectively carried out in sewage. Many users do not know the configuration concentration of polyacrylamide (PAM) very well, thinking that the higher the concentration, the better the flocculability, is this the correct operation?
Polyacrylamide configuration concentrations are generally 0.1%-0.3% and are suitable for flocculation precipitation (depending on PAM molecular weight or precipitation rate). The concentration of urban and industrial sludge dewatering is between 0.2% and 0.5% (the concentration needs to be adjusted according to the concentration of sludge). The size of the PAM configuration concentration depends entirely on the concentration of sewage and sludge, and the
polyacrylamide configuration concentration should be increased when the impurities in the sewage are too large. Too large a concentration will also affect the use effect, so be sure to do a good test before using the machine to determine a reasonable dosage. Many users are vague about the ionic properties of polyacrylamide (PAM) and will not choose the type of ionic properties of polyacrylamide based on the actual situation? Polyacrylamide models can be roughly divided into three types: anionic type, cationic type, and nonionic type. Anions are suitable for sewage flocculation, sedimentation, deletion, clarification, etc., and can also be used for inorganic sludge dewatering. Cationic polyacrylamide is suitable for flocculation, sedimentation, decolorization, clarification, etc. of complex water quality, urban sludge dehydration, organic sludge dehydration, etc. Nonionic polyacrylamide is suitable for soil water retention, weakly acidic sewage flocculation, sedimentation, dehydration, etc.
How to choose the right type of PAM?
Polyacrylamide (PAM) can be divided into four types according to its ionic properties: non-ionic, anionic, cationic and amphoteric polyacrylamide. In the face of the chaotic specification system of the market, it is indeed very difficult to choose the polyacrylamide model for their own sewage system, how to get a few tricks to get the common problem of polyacrylic selection of sewage or sludge. Understand the source of sludge Sludge is an inevitable product in sewage treatment, first of all, we should understand the source, properties, composition and solid content of sludge. According to the main components contained in sludge, sludge can be divided into organic sludge and inorganic sludge. Generally speaking, cationic polyacrylamide is used to treat organic sludge, anionic polyacrylamide is used to treat inorganic sludge, cationic polyacrylamide is not easy to use when it is very alkaline, and anionic polyacrylamide should not be used when it is very acidic, and the amount of polyacrylamide is usually larger when the solid content of the sludge is high. Ionization selection of polyacrylamide (PAM) For the sludge to be dehydrated, flocculants of different ionic degrees can be screened through small experiments to select suitable polyacrylamide, so that the flocculant effect can be achieved, and the dosage can be minimized, saving costs. The key to selecting ionism is: The size of the flocculent The size of the flocculent: too small flocculent will affect the speed of drainage, and too much flocculation will make the flocculent bind more water and reduce the degree of mud biscuits. The size of the flocs can be adjusted by selecting the molecular weight of polyacrylamide. Floc strength (moisture content) Strength of the floc: The floc should remain stable and not break under shear. Increasing the molecular weight of polyacrylamide or selecting the appropriate molecular structure can help improve floc stability. Mixing of
polyacrylamide and sludge Polyacrylamide must fully react with sludge at a certain position of the dewatering equipment to cause flocculation. Therefore, the viscosity of the
polyacrylamide solution must be appropriate, and it can be fully mixed with the sludge under the existing equipment conditions. The viscosity of polyacrylamide solution is related to its molecular weight and formulation concentration. Dissolution of polyacrylamide Only when it dissolves well can it give full play to the flocculation effect. As mentioned earlier, the dissolution process of polyacrylamide is actually the maturation process of
polyacrylamide, and sometimes it is necessary to speed up the dissolution speed, so consider increasing the concentration of polyacrylamide solution. Therefore, the product selection must be determined by laboratory beaker experiments. From the above, it can be seen that the choice of molecular weight and ionization degree is not absolute, before choosing
polyacrylamide to do selection tests, on-machine operation tests, so that the data obtained is the most accurate, and the preferred polyacrylamide is more cost-effective. The main products of flocculant manufacturer Xinhuan Water Treatment are: White polyaluminium chloride (food grade), drinking grade polyaluminium chloride, industrial grade polyaluminium chloride, anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polymerized iron and aluminium chloride, and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：86 19139972558 Email：Sunny@xhwtm.com Contact:Sunny
