Polyacrylamide for Wastewater Treatment in Sugar Industry

Sugar has a chemical name called "carbohydrate". Among the three main nutrients that provide heat energy for the human body, the cheapest nutrients are indispensable elements for the human body. Every day, we more or less need to supplement the body with sugar. When it comes to sugar, people always think of sweetness, but there is a saying in the sugar industry: "Sugar is produced at the front door, and sewage is discharged at the back door." Although it is not completely objective, it reflects the embarrassment of pollution in the sugar industry.

The sugar industry produces sweetness and leaves pollution, and the environmental pollution caused by sweetness should not be borne by ordinary people. There are many wastewater treatment processes that can treat sugar wastewater to standards. The flocculant polyaluminum chloride and the coagulant aid polyacrylamide are used in many places.

1. As an additive, polyacrylamide is an indispensable part of sugar making

Syrup is obtained by processing cane sugar and sugar beets. The sugarcane juice is first extracted by diffusion or pressing, and then the juice is extracted after clarification. The juice is then concentrated and crystallized by evaporation to form sugar, which comes from specialized polyacrylamide manufacturers in the sugar industry. Finally, crystalline sugars are formed by separation, drying and crystallization. If the juice is obtained from a juicer, it needs to be heated first, and slaked lime and polyacrylamide are added for flocculation and precipitation. The role of lime can not only adjust the pH, but also sterilize. In this process, pH is very important. Under acidic conditions, sucrose is decomposed into glucose and fructose. When the pH exceeds 11.5, glucose and fructose can be rapidly decomposed. Heat to about 100°C, add pam powder to the neutral sugar juice, pour it into a sedimentation tank, use polyacrylamide as a decolorizing agent to perform flocculation, precipitation and decolorization, and take the supernatant juice for the next step.

Sugar production wastewater is the wastewater discharged from the sugar production process with sugar beet or sugar cane as raw materials. It mainly comes from the sugar making process and the comprehensive utilization process of sugar making by-products, as well as chute wastewater, sugar extraction wastewater, distillation wastewater, washing water, etc.

2. The principle and function of juicing in sugar mills are related to the use characteristics of polyacrylamide

(1) Flocculation: Polyacrylamide pam powder is a kind of polymer flocculant, which neutralizes the suspended solids in the water by electric charge, and adsorbs them through the viaduct to produce polymer flocs.

(2) Bonding: through the bonding principle of physical methods, mechanical methods and chemical methods, it plays a role in bonding.

(3) Resistance reduction: After adding polyacrylamide in water, the frictional resistance of water can be reduced by 50-80%.

(4) Thickening property: The thickening property of polyacrylamide pam powder has little effect below PH 10, and thickens when it is neutral or acidic. When the pH is higher than 10, hydrolysis easily occurs. Polyacrylamide is a functional product. In the sugar industry, due to different processes, it is impossible to determine which polyacrylamide is best to use, which can be food grade or industrial grade. Engineers suggest that the best use effect can be determined by experimental methods.