In the process of treating industrial wastewater and domestic sewage, polyaluminium chloride (PAC) is widely used as a coagulant to remove suspended solids, colloidal substances and some soluble organic matter in water. However, water quality itself is a complex and changeable system. Fluctuations in its composition, temperature, pH value, organic matter content and other factors may have a direct or indirect impact on the coagulation effect of PAC. Let's learn about it together with Xinhuan polyaluminium chloride manufacturer.
Effect of water quality on polyaluminium chloride PAC:
Effect of pH value: If the pH value of the water body is too low (<4), the solubility of Al(OH)₃ in polyaluminium chloride may decrease, thereby weakening the flocculation effect. When the pH value is too high (>9), aluminum ions are prone to form aluminum hydroxide precipitation, which not only reduces the effective flocculation components, but also may cause secondary pollution.
Effect of water temperature: Lower temperatures slow down the chemical reaction rate and molecular diffusion rate, making the flocculation process slower, and the flocs formed may be smaller and less likely to settle. Therefore, under low temperature conditions, the dosage of polyaluminium chloride needs to be increased to achieve the desired flocculation effect.
Effect of organic matter concentration: The presence of a large amount of organic matter may interfere with the mechanism of action of polyaluminium chloride PAC. For example, organic matter may hinder the effective contact of polyaluminium chloride by encapsulating pollutant particles, or directly react with polyaluminium chloride to consume part of the active ingredients.
Suspended solids or turbidity: Higher suspended solids or turbidity means that there are more particles to be treated, which places higher requirements on polyaluminium chloride. In order to achieve the same flocculation effect, the dosage of polyaluminium chloride may need to be increased. At lower suspended solids or turbidity, PAC can more effectively aggregate fine particles to form larger flocs for subsequent separation.
Hardness: In hard water containing higher concentrations of calcium and magnesium ions, the flocculation performance of polyaluminum chloride PAC may be affected. Because these divalent cations compete with PAC for binding sites, reducing its adsorption capacity for pollutants.
Redox environment: Changes in the redox environment will affect the dissolved oxygen level and microbial activity in the water, which will indirectly affect the flocculation effect of PAC.
Countermeasures for water quality fluctuations affecting polyaluminum chloride PAC:
Adjust the PAC dosage: Flexibly adjust the dosage of polyaluminum chloride according to the specific water quality conditions to ensure the best flocculation effect.
Adjust the pH value: Adjust the pH value of the water quality by adding acidic and alkaline substances to keep it within the optimal flocculation range of polyaluminum chloride.
Control water temperature: When possible, control the water temperature by heating or cooling measures to improve the flocculation effect of polyaluminum chloride.
Pretreatment measures: For complex water quality, auxiliary measures such as pre-oxidation and coagulation can be considered to improve flocculation conditions.
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, polyferric aluminium chloride and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：+8619003830067 Email：joanna@xhwtm.com Contact:Joanna
