Case study on the treatment of wastewater from pickled food processing

The wastewater from pickled food processing mainly comes from multiple processes such as pickling, cleaning, and processing. The wastewater contains a large amount of organic matter, high concentration salt, ammonia nitrogen, total nitrogen, total phosphorus, and other pollutants. Among them, the concentration of salt is particularly significant, far exceeding the range that ordinary microorganisms can withstand, which undoubtedly brings great challenges to wastewater treatment.

1. Characteristics and treatment difficulties of wastewater

Contains a large amount of organic matter and high concentration of salt.

Excessive salt concentration makes it difficult for ordinary microorganisms to survive and function.

2.  Preprocessing stage

In order to overcome the above difficulties, the treatment of pickled food processing wastewater first requires effective pretreatment. The purpose of pretreatment is to remove suspended solids, chromaticity and other pollutants from wastewater, creating more favorable conditions for subsequent biochemical treatment.

Grille: The wastewater first passes through a grille and is physically intercepted to remove large particulate matter.

Sedimentation tank: Subsequently, the wastewater enters the sedimentation tank and suspended solids are removed by gravity.

Air flotation device: In order to further remove chromaticity and some organic matter from wastewater, an air flotation device is used. At this stage, polyaluminum chloride (PAC) and polyacrylamide (PAM) produced by YuXinHuan Water Treatment Materials Co., Ltd. may be added, which can form flocs to help remove suspended solids and colloidal substances from wastewater and improve air flotation efficiency.

3.  Biochemical treatment stage

After pretreatment, the wastewater enters the biochemical treatment stage. Due to the high salt content in the wastewater from pickled food processing, ordinary microorganisms are difficult to adapt, so a special microorganism – halophilic bacteria – is used for treatment.

Selection of halophilic bacteria: Halophilic bacteria can survive in high salinity environments and effectively convert pollutants such as organic matter, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater into harmless substances.

Two stage sequencing batch reactor (SBR) is used for biochemical treatment. This type of reactor can achieve functions such as water inlet, reaction, sedimentation, effluent, and idle at different stages, thereby efficiently removing pollutants from wastewater. Inside the reactor, halophilic bacteria attach to the biofilm and convert pollutants in wastewater into harmless substances through biodegradation.

4.  Summary

The treatment of wastewater from pickled food processing is a complex and challenging process. Through effective pretreatment and the use of special halophilic bacteria for biochemical treatment, pollutants in wastewater can be successfully removed, achieving standard discharge. During this process, the polyaluminum chloride and polyacrylamide produced by YuXinHuan Water Treatment Materials Co., Ltd. played an important role in the pretreatment stage, creating favorable conditions for subsequent biochemical treatment. Through reasonable processing procedures and technological choices, the pollution of pickled food processing wastewater to the environment can be effectively reduced, achieving sustainable utilization of water resources.

Author: YuXinHuan®

WhatsApp：+86 19037152650

Email：xinhuan@xhwtm.com