Wastewater treatment is a very important part of the food industry, especially in polyacrylamide food factories. In order to protect the environment and reduce the emission of pollutants, polyacrylamide food factories need to adopt an effective wastewater treatment process. This article will introduce a commonly used polyacrylamide food plant wastewater treatment process, as well as its principle and operation method.
First, the characteristics of sewage
The main characteristics of the wastewater of the polyacrylamide food factory are that it contains high concentrations of organic matter, total suspended solids, nitrogen, phosphorus and other nutrients. These pollutants not only pollute the environment, but also pose a threat to the ecological environment of the surrounding water bodies. Therefore, it is of great significance to treat the wastewater of polyacrylamide food plants.
Second, the treatment process
The sewage treatment process of polyacrylamide food plant mainly includes three stages: pretreatment, biochemical treatment and advanced treatment.
1.Pre-treatment phase
The main purpose of pretreatment is to remove solid suspended solids and sediments in sewage and reduce the interference to subsequent biochemical treatment. Generally, physical methods are used, such as screen filtration, grit remover and so on. The specific treatment process is as follows:
2.Biochemical processing stage
Biochemical treatment is the core stage of treating polyacrylamide food factory effluents, mainly through the degradation of organic matter by microorganisms to remove contaminants. Generally, a combination of aerobic biological treatment and anaerobic biological treatment is used. The specific treatment process is as follows:
3.Deep processing stage
Advanced treatment mainly treats the remaining nutrients, trace organic matter and microorganisms to further improve the effluent quality and reduce the impact on the water environment. The specific treatment process is as follows:
Third, the principle of the process
The principle of the sewage treatment process of polyacrylamide food factory is to quickly decompose and convert the organic substances in the sewage into harmless substances through physical, chemical and biological methods to achieve the purpose of purifying water quality. Here's how it works:
1.Screen filtration and grit remover in the pretreatment stage are effective in removing large suspended solids and sediments.
2.The activated sludge process and aeration tank in the aerobic treatment stage use microorganisms under aerobic conditions to degrade organic matter into water and carbon dioxide.
3.Anaerobic tanks in the anaerobic treatment stage degrade organic matter into water, carbon dioxide and methane through the anaerobic respiration of microorganisms.
4.Activated carbon adsorption, flocculant treatment and sedimentation tanks in the advanced treatment stage can further remove trace organic matter and microorganisms from the effluent.
Fourth, the operation method
In practice, the sewage treatment process of polyacrylamide food factory needs to be carried out according to the following steps:
1.Pretreatment stage: firstly, the sewage is filtered through the screen to remove large suspended particles, and then the solid sediment is removed by sedimentation tank sedimentation.
2.Biochemical treatment stage: The pre-treated water is fed into the aerobic treatment system, and the organic matter is degraded by activated sludge method and aeration tank. The water is then fed into an anaerobic tank for anaerobic treatment to continue the degradation of organic matter.
3.Advanced treatment stage: the biochemically treated water enters the coagulation tank, adds flocculant for coagulation, then passes through the sedimentation tank to precipitate and clarify, and finally removes trace organic matter through activated carbon adsorption.
Through the above steps, the sewage of the polyacrylamide food factory was effectively treated, and the purpose of purifying the water quality was realized.
In short, the sewage treatment process of polyacrylamide food factory is an important environmental protection work. Through the operation of three stages of pretreatment, biochemical treatment and advanced treatment, organic substances and pollutants in sewage can be effectively removed to protect the health of the environment and water ecosystem.