TW EASTERN CHEM SINGAPORE PTE.LTD
Comparison of Polyacrylamide and Polyaluminium Chloride
Polyacrylamide (PAM) is an organic flocculant.
According to the different groups on its molecular chain, it can be divided
into anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide
and amphoteric polyacrylamide. Polyacrylamide is mainly used in water
treatment, textile, printing and dyeing, coal washing, pharmaceutical, sugar
purification, geological exploration, petrochemical industry, petroleum
exploitation and smelting. In wastewater treatment, polyacrylamide mainly plays
the role of adsorbing and bridging, and the interaction between charges makes
the fine particles form larger flocs and make them settle.
Polyaluminium
chloride (PAC) is a kind of inorganic macromolecule coagulant. It is an
inorganic macromolecule water treatment agent with high molecular weight and
high charge, which worked due to the bridging effect of hydroxide ions and the
polymerization of polyvalent anions. Polyaluminium
chloride is mainly used for surface water and groundwater purification,
municipal sewage treatment, industrial waste water residue recycling of useful
substances. It is also widely used in printing and dyeing, leather, paper
making, coal washing, food processing, sugar night refining, cosmetics and
other industries.
Polyacrylamide
and polyaluminium chloride are collectively called flocculants. Polyacrylamide
is an organic flocculant and polyaluminium chloride is an inorganic flocculant.
Both of them are widely used in various fields. As for sewage treatment, they
have their own advantages. Polyaluminium chloride has a wide range of
applications and wide adaptability to water. It is easy to form large alum
flowers quickly and has good precipitation performance. The suitable range of
PH value is wide (5-9), and the PH value and alkalinity of treated water
decreased slightly.
When the water temperature is low,
the stable precipitation effect can still be maintained. The alkalinity is
higher than that of other aluminium salts and iron salts, which cause much less
erosion for equipment. Polyacrylamide can improve the efficiency of wastewater
treatment by 20% compared with polyaluminium chloride. Especially in sludge
dewatering, polyacrylamide has its unique advantages. In the recycling of
reclaimed water, it can improve the recycling efficiency of reclaimed water and
reduce the operating cost of enterprises. Particularly in the water shortage
and deteriorating water environment, polyacrylamide shows more advantages in
water treatment. In some aspects, the combination of polyacrylamide and
polyaluminium chloride can achieve better water treatment effect.