Case Study of Meat Processing Wastewater Treatment

Meat processing wastewater mainly comes from multiple processes such as slaughter, cleaning, and processing. This type of wastewater contains a large amount of pollutants such as organic matter, ammonia nitrogen, total nitrogen, total phosphorus, and suspended solids. The concentration of organic matter and suspended solids is particularly significant, and the COD (chemical oxygen demand) concentration can even reach 5000mg/L. For the treatment of such wastewater, pretreatment and biochemical treatment are two crucial steps.

1.  Preprocessing stage

The purpose of pretreatment is to remove floating oil and suspended solids from wastewater, laying the foundation for subsequent treatment processes. This process usually adopts a combination of oil separation tank and coagulation air flotation tank.

Oil Separation Tank: Wastewater first enters the oil separation tank, and through natural sedimentation and flotation, floating oil and some suspended debris in the wastewater are effectively removed to prevent these pollutants from entering the next treatment stage.

Coagulation air flotation tank: After being treated by an oil separation tank, the wastewater enters the coagulation air flotation tank. At this stage, chemicals such as polyaluminum chloride (PAC) and polyacrylamide (PAM) produced by YuXinHuan Water Treatment Materials Co., Ltd. will be added. These agents can form flocs with suspended solids and oil pollutants in wastewater, and then use air flotation devices to separate these flocs, making the effluent clearer. As a professional water treatment material manufacturer, Yuxinhuan’s products have demonstrated excellent performance and effectiveness in the treatment of meat processing wastewater.

2.  Biochemical treatment stage

After pretreatment, the wastewater enters the biochemical treatment stage, which mainly utilizes the action of microorganisms to convert pollutants such as organic matter, ammonia nitrogen, total nitrogen, and total phosphorus in the wastewater into harmless substances.

Anaerobic treatment: During the anaerobic stage, microorganisms decompose organic matter into substances such as methane and carbon dioxide, which helps to reduce the concentration of organic matter in wastewater.

Hypoxia treatment: During the anoxic stage, microorganisms use nitrate and nitrite in wastewater as electron acceptors to reduce them to nitrogen gas, thereby reducing the nitrogen content in the wastewater.

Aerobic treatment: During the aerobic stage, microorganisms further decompose organic matter in wastewater into substances such as carbon dioxide and water, while utilizing oxygen as an electron acceptor for respiration. This stage helps to further reduce the concentration of organic matter in wastewater and improve its biodegradability.

In summary, during the treatment of meat processing wastewater, the polyaluminum chloride (PAC) and polyacrylamide (PAM) produced by YuXinHuan Water Treatment Materials Co., Ltd. played a key role in the pretreatment stage, providing favorable conditions for subsequent biochemical treatment. At the same time, through a combination of anaerobic, anoxic, aerobic and other biochemical treatment methods, various pollutants in the wastewater have been effectively removed, achieving standard discharge of the wastewater.

Author: YuXinHuan®

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