Aoshen Supply Fully Automatic Reclaimed Water Equipment Water Reuse Device Water Treatment Equipment Wastewater Treatment Equipment

Industrial wastewater refers to the wastewater and waste liquid generated in the industrial production process, which contains industrial production materials, intermediate products, by-products that are lost with water, as well as pollutants generated during the production process. According to the chemical properties of the main pollutants contained in industrial wastewater, there are inorganic wastewater mainly containing inorganic pollutants and organic wastewater mainly containing organic pollutants. For example, electroplating wastewater and mineral processing wastewater are inorganic wastewater, while food or petroleum processing wastewater is organic wastewater. According to the products and processing objects of industrial enterprises, they can be divided into papermaking wastewater, textile wastewater, tannery wastewater, pesticide wastewater, metallurgical wastewater, refining wastewater, etc. According to the main components of pollutants contained in wastewater, it can be divided into acidic wastewater, alkaline wastewater, phenolic wastewater, chromium wastewater, organic phosphorus wastewater, and radioactive wastewater.

The main measures for the prevention and control of chemical wastewater pollution are: firstly, production processes and equipment should be reformed to reduce pollutants, prevent wastewater discharge, and carry out comprehensive utilization and recovery; The treatment level of wastewater that must be discharged should be selected based on water quality and requirements.
The primary treatment mainly separates suspended solids, colloids, floating oil or heavy oil from water. Methods such as water quality and quantity regulation, natural sedimentation, flotation, and oil separation can be used.
Secondary treatment mainly involves the removal of biodegradable organic dissolved substances and some colloids, reducing the biochemical and partial chemical oxygen demand in wastewater, and usually using biological methods for treatment. After biological treatment, a considerable amount of COD remains in the wastewater, sometimes with high color, smell, and taste, or due to high environmental hygiene standards, a tertiary treatment method needs to be used for further purification.
The third level treatment mainly involves removing organic pollutants and dissolved inorganic pollutants that are difficult to biodegrade from wastewater. The commonly used methods include activated carbon adsorption and ozone oxidation, as well as ion exchange and membrane separation technologies. Various chemical industry wastewater can be treated using different methods based on different water quality, quantity, and requirements for the discharged water quality after treatment.

The food industry has a wide range of raw materials and a wide variety of products, with significant differences in the amount and quality of wastewater discharged.
The main pollutants in wastewater include:
Solid substances floating in wastewater, such as vegetable leaves, fruit peels, minced meat, bird feathers, etc; The substances suspended in wastewater include oils, proteins, starch, colloidal substances, etc; Acids, alkalis, salts, sugars, etc. dissolved in wastewater; Mud, sand, and other organic substances carried by raw materials; Pathogenic bacteria and toxins.
The characteristics of food industry wastewater are high content of organic matter and suspended solids, easy to decay, and generally no significant toxicity. Its harm mainly lies in eutrophication of water bodies, leading to the death of aquatic animals and fish, promoting the odor of organic matter deposited at the bottom of the water, deteriorating water quality, and polluting the environment.
In addition to appropriate pre-treatment according to the characteristics of water quality, biological treatment is generally recommended for the treatment of food industry wastewater. If there is a high requirement for the quality of the effluent or due to the high content of organic matter in the wastewater, a two-stage aeration tank or two-stage biological filter, or a multi-stage biological rotary table, or a combination of two biological treatment devices, or an anaerobic aerobic series connection can be used.