The flocculant polyacrylamide has been widely used in sugar industry, petroleum industry, chemical industry and other industries, and the polymer of polyacrylamide is non-toxic. However, in the process of using polyacrylamide, it is inevitable that trace amounts of acrylamide monomer remain, and the monomer has some toxicity. Therefore, when using the flocculant polyacrylamide, the content of residual acrylamide monomer in polyacrylamide must be strictly controlled.
Cationic polyacrylamide is generally used in the treatment of waste molasses from sugar mills and waste water produced in the production process. The cationic polyacrylamide has a large molecular weight, many functional groups, and a strong adsorption bridging ability. The positive charge density of the macromolecular chain of cationic polyacrylamide is high, the charge neutralization and adsorption bridging ability are strong, the water solubility is good, the flocculation ability is strong, and it has good flocculation, flotation, temperature resistance, and acid resistance. Alkaline capacity. Compared with other flocculants, cationic flocculants have the advantages of low dosage, good flocculation effect, fast settling speed, short treatment process time, easy treatment of the floccules produced, high treatment efficiency, and easy degradation by microorganisms in the environment after use. advantage.
Sugar industry wastewater is the wastewater discharged from sugar beet or sugarcane as raw materials. The wastewater generally contains organic matter and sugar, among which COD and BOD are high; in addition, wastewater contains high levels of nitrogen, phosphorus, potassium and other elements. Mainly comes from rapid distillation, sugar squeezing wastewater, ground washing water, etc. The sugar industry wastewater treatment cannot be separated from polyacrylamide, and the flocculant anionic polyacrylamide plays an important role.
The mechanism of polyacrylamide flocculation lies in bridging, which promotes the formation of coarse flocculation clusters and precipitation. The increase in the amount of polyacrylamide will help the bridging to be fully formed, but the excessive amount will cause adsorption saturation, forming a covering layer on the colloidal particles to make the colloidal particles stable again. The flocculation layer of chitin polyacrylamide flocculation is more than starch, and the height of the sediment obtained is much higher than that of starch, so the flocculation effect of polyacrylamide is much more obvious than starch.
1. Anionic polyacrylamide extracts pure sugar water, removing impurities can improve the quality of sugar water;
2. Anionic polyacrylamide can purify sugar juice, its molecular weight is fixed on the surface of different particles, so that the particles form aggregates and settle;
3. Anionic polyacrylamide can filter syrup and save processing time, thereby improving the efficiency of production and processing.
Due to the complex composition of waste molasses, a large amount of non-sugar components and impurities (such as melanin, heavy metal ions, colloidal substances, etc.) are mixed, it is difficult to separate. At present, there are several separation methods at home and abroad, among which chemical flocculation methods are more used.
The chemical flocculation method mainly uses the flocculation of inorganic flocculants, polyacrylamide polymer flocculants and other sewage treatment chemicals to flocculate and settle the particles in the wastewater. The process is simple, the investment is low, and the sewage treatment effect is obvious.
Therefore, cationic polyacrylamide has a good effect on the separation and clarification of sugar cane molasses and the treatment of sugar wastewater.
At present, the treatment technology of sugar wastewater mainly includes physical and chemical methods and biochemical methods. Due to the good biodegradability of sugar wastewater, biochemical methods are often used in the treatment of this wastewater at home and abroad. Biochemical methods mainly include anaerobic treatment, aerobic treatment, and anaerobic-aerobic treatment. Physicochemical method Physicochemical method is mainly used for pretreatment of wastewater. The method includes: coagulation precipitation method, adsorption method, ion exchange method, extraction method, diffusion dialysis method, electrodialysis method, etc.
According to years of experiments, the sugar wastewater uses cationic polyacrylamide for sludge dewatering, and then the recovered sludge is used in other aspects, so that the waste generated in sugar production can be fully utilized. The specific type of polyacrylamide product to be used requires experimental selection of water quality. Capitel Chemical can free experimental selection to provide users with polyacrylamide products with better effects and less dosage.
Sugarcane molasses is a by-product of the sugar industry. It is a thick, dark-brown, semi-liquid object. Its composition varies with the sugar-making raw materials and processing conditions. It mainly contains a large amount of fermentable sugar (mainly sucrose), which is a good fermentation raw material. It can be used as a substrate or base material for fermented products such as alcohol, yeast, monosodium glutamate, organic acid, etc. It can also be used as a raw material for certain foods. And animal feed.