The pH value of the sewage raw water is a key point that can affect the flocculation effect of polyaluminium chloride in sewage. The good or bad flocculation and sedimentation effect of polyaluminium chloride in sewage is directly related to the effect of sewage treatment. How to make the flocculation effect of polyaluminium chloride play a good role? Pay attention to the pH value of sewage. If you don't pay attention to this, no matter which content and different manufacturers' products are used, they can't play a good treatment role.
Polyaluminium chloride is a kind of inorganic polymer coagulant in water treatment. Due to the bridging effect of hydroxide ions and the polymerization of multivalent anions, the inorganic polymer water treatment agent with large molecular weight and high charge is produced. When using polyaluminium chloride to treat sewage, the pH value of the sewage must be adjusted first. No matter what type of sewage, if polyaluminium chloride is used, the pH value of the sewage must be reduced to about 7, and then polyaluminium chloride is added. The effect of sewage treatment is good, which is also an important factor affecting the effect of polyaluminium chloride.
The pH value usually refers to the acidity and alkalinity of the current raw water. Generally, the pH value of printing and dyeing sewage will be higher, and some can even reach about 12. Such sewage needs to lower the pH value of the water body to about 7, otherwise the alkalinity of the sewage is too strong. The higher the content of polyaluminum chloride solution, the higher the acidity. The pH value of 10% polyaluminum chloride solution is about 1.0, and the use condition of polyaluminum chloride is that it must be used in neutral water. It cannot be used if the pH value is lower than 5.6 or higher than 9.0, and it has no effect.
How to use polyaluminum chloride: In order to achieve a good flocculation effect and economic benefit, users can determine the dosage through experiments according to different raw water turbidity, different seasons and different pool shapes. The higher the raw water turbidity, the thinner the solution should be, and the higher the dosage, the better the flocculation effect.
The bath water, laundry water, and toilet flushing water we discharge daily are all domestic sewage. The composition of domestic sewage is very complex. The main pollutants are ammonia, nitrogen, and phosphorus. Polyaluminum chloride can be used to treat these sewage. If the phosphorus in domestic sewage exceeds the standard, it will cause serious harm to the water body. Algae in the water will multiply in large numbers, consume oxygen in the water, and fish and shrimp in the river will die due to lack of oxygen. Therefore, the treatment of domestic sewage cannot be sloppy. There is generally a complete set of processes for domestic sewage treatment: water inlet → screen → biochemical treatment → first sedimentation tank → second sedimentation tank → desludging → cleaning → landfill. Generally, in the process of domestic sewage treatment, these two methods can reduce the phosphorus content and meet the water quality discharge standard.
①, chemical treatment method - through the polyaluminum chloride precipitation method, let the phosphorus precipitate, and remove part of the phosphorus through this precipitation.
②, biochemical treatment method - through bacterial culture, let the bacteria devour the other part of the phosphorus content.
The method of Xinhuan polyaluminum chloride to treat domestic sewage is as follows:
In the domestic sewage treatment process, polyaluminum chloride (PAC) or polyferric sulfate will be used for flocculation precipitation in the precipitation part, and flocculant polyacrylamide (PAM) will be added in the desludging link. Generally, polyacrylamide cations are used for desludging with better results. The specific cation ion selection should be based on the influent concentration and the type of filter press.
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
