Gelatin is a hydrolyzed product of collagen, fat-free, high-protein, and cholesterol-free. It is a natural nutritious food thickener, stabilizer, thickener, foaming agent, emulsifier, dispersant, clarifier, etc., Wide range of applications. The gelatin production industry consumes large amounts of water and emits large amounts of pollutants. The high calcium, high alkali, and high organic pollutant content of gelatin wastewater makes it more harmful to human production, life and the ecological environment, and the treatment is relatively difficult. , It is difficult to meet the emission standard only with a single aerobic biological treatment, and the cost of using physical and chemical methods is too high. Gelatin wastewater has the characteristics of large wastewater volume, high alkalinity, high calcium ion concentration and high COD. Gelatin wastewater mainly includes degreasing wastewater, acid leaching wastewater, liming wastewater and washing and neutralization wastewater. The degreasing wastewater mainly contains organic matter such as oil and protein. Acid pickling wastewater is mainly inorganic components in bones, including calcium phosphate and calcium carbonate. The liming wastewater mainly contains nutrients such as protein, amino acid, N and P.
The process of gelatin production determines that gelatin production is both a major water user and a major polluter. In particular, the liming section of gelatin production discharges high-organic waste water, which seriously pollutes the surrounding environment. In order to control the pollution of gelatin production wastewater, scientific research and engineering technicians from various countries have done a lot of research work. In developed countries, the pollution of gelatin wastewater has been controlled to a certain extent, and there are many treatment experiences worth learning. Polyacrylamide for gelatin wastewater, However, due to the large water consumption of gelatin production, the total amount of pollutants and the large drainage volume, the processing cost is negative. From the analysis of the process flow, the sewage of this project mainly comes from the concentrated water discharge of equipment washing, fresh skin cleaning, concentration and cooling water.
Gelatin wastewater treatment method, because of the characteristics of gelatin wastewater, the first thing to do is to destroy the stability of the water body. The suspended particles and colloidal particles in the wastewater are very light. They are subjected to irregular Brownian motion by the collision of the thermal motion of the molecules. At the same time, the colloids are charged, and the colloids of the same kind have the same charge, forming repulsive forces between each other, and cannot be close to each other to form large particles sinking. . Based on years of practice, Capitel Chemical has summarized a set of practical treatment methods: coagulation destabilization, flocculation sedimentation method.
The choice of flocculants, the main coagulants are polyaluminum chloride and sulfates. In the water treatment coagulation process, adding coagulant will cause the metal ion hydrolysis and polymerization reaction process. At this time, the colloidal particles in the water can strongly adsorb the products of the hydrolysis and polymerization reaction. The adsorbed positively charged multinuclear complex ions can compress the electric double layer, lower the potential, reduce the repulsive force between colloids, and achieve the purpose of particle destabilization.
The flocculant used for gelatin wastewater treatment is mainly polyacrylamide, Polyacrylamide for gelatin wastewater, which is an organic polymer flocculant, which mainly adsorbs colloidal particles to molecular chains through adsorption and bridging to form large floccules. The specific polyacrylamide used in the gelatin factory is because the composition of the gelatin wastewater is more complicated, and the quality of the sewage produced by different enterprises is different, and the selection of the polyacrylamide product selection is also different. It is recommended to conduct a small test first, and then go to the factory for a large-scale test to determine the better dosage and purification effect of polyacrylamide.