Polyacrylamide is a commonly used chemical additive that is widely used in various industries. In the production process of polyacrylamide food factory, a large amount of wastewater will be generated, which will cause serious pollution to the environment if it is not treated and treated effectively. Therefore, we need to develop a corresponding plan for the sewage treatment of polyacrylamide food plants.
Before developing a wastewater treatment plan, we first need to analyze the wastewater properties of the polyacrylamide food plant. According to the requirements of China's "Comprehensive Sewage Discharge Standard" (GB8978-1996), we need to test the following indicators:
1.Chemical Oxygen Demand (COD): A measure of the amount of organic matter and is an indicator of the total amount of organic matter in the wastewater.
2.Biochemical oxygen demand (BOD): A measure of the biodegradability of organic matter, i.e., the total amount of organic matter that needs to be biodegraded.
3.Suspended Solids (SS): A measure of solid particulate matter in sewage.
4.Total Phosphorus (TP): A measure of the amount of phosphorus in the effluent.
5.Total Nitrogen (TN): A measure of the amount of nitrogen in the effluent.
6.pH: A measure of the acidity and alkalinity of sewage.
By testing the above indicators, we can understand the pollution degree and specific composition of the wastewater of the polyacrylamide food factory, which provides a basis for the subsequent treatment plan.
According to the nature of the polyacrylamide food factory effluent, we can design the following treatment schemes:
1.Pre-treatment
Before advanced treatment, we need to pre-treat the wastewater, the main purpose of which is to remove large suspended solids and reduce chemical oxygen demand. Commonly used pre-treatment methods include:
Screen filtration: Filtration is carried out using a fine mesh to remove large suspended particles.
Adjust the pH value: Adjust the pH value appropriately according to the pH of the sewage so that the follow-up treatment process can be carried out smoothly.
2.Biochemical treatment
Biochemical treatment is the process of converting organic matter into inorganic matter through biological action. In the wastewater treatment of polyacrylamide food factory, we can adopt the following biochemical treatment methods:
Activated sludge method: the activated sludge microflora is used to degrade and decompose organic matter. Through the combination of aerobic reaction tank, oxidation tank and sedimentation tank, chemical oxygen demand and biochemical oxygen demand can be effectively removed.
3.Phosphorus and nitrogen are removed
In polyacrylamide food plant effluents, the levels of total phosphorus and total nitrogen are often high and require special removal treatments. Here's how we can do this:
Chemical precipitation method: by adding chemical agents, such as ammonium sulfate salt or iron chloride, phosphorus and nitrogen and metal ions form insoluble precipitates, so as to achieve the removal of phosphorus and nitrogen.
4.Deep processing
After pre-treatment, biochemical treatment and phosphorus and nitrogen removal, the water quality of the wastewater of the polyacrylamide food factory has been effectively improved. But in order to better meet the national emission standards, further advanced treatment methods can be adopted, such as:
Activated carbon adsorption: Through the adsorption of activated carbon, the refractory organic matter and heavy metal ions in sewage are removed.
UV sterilization: the use of ultraviolet light to irradiate sewage to destroy the structure and function of bacteria and other microorganisms to achieve the purpose of sterilization.
In order to implement the above sewage treatment scheme, the polyacrylamide food factory needs the corresponding sewage treatment equipment. Common devices include:
Screen: used for the initial filtration and removal of suspended solids.
Activated sludge tanks: for biodegradation and oxidation.
Sedimentation tank: used for sedimentation and removal of suspended solids.
Advanced treatment equipment: such as activated carbon adsorption device and UV sterilization equipment.
The selection and configuration of these equipment should be tailored to the specific situation and needs to ensure efficient treatment of polyacrylamide food plant effluents.
Wastewater treatment in polyacrylamide food factories is a complex task, which requires comprehensive consideration of the nature of the wastewater, treatment methods and equipment selection. Through the comprehensive application of pre-treatment, biochemical treatment, phosphorus, nitrogen removal and advanced treatment, the sewage of polyacrylamide food factory can be effectively treated and meet the national discharge standards. This not only protects the environment, but also increases the sustainability of the polyacrylamide food plant. At the same time, scientific and reasonable sewage treatment is also the embodiment of corporate social responsibility, and it is also of positive significance for the promotion of corporate image and the enhancement of market competitiveness.