It's widely known that food processing plants like our company, CAOIL, generate a variety of waste residues, differing from meat products, vegetables and fruits, carbonated beverages, and brewing processes. This indicates the presence of high-fat and high-colorant chemicals. So, let's take a look at the general process of wastewater treatment in food processing plants. Friends interested in this topic, join the author of this article to learn more.

General Process for Wastewater Treatment in Food Processing Plants

The general process for wastewater treatment in food processing plants primarily consists of a combination of a sewage pond, an anaerobic pond, an aerobic pond (contact oxidation pond), and a secondary sedimentation tank.

Wastewater from the production line flows to the wastewater pond. The entrance channel is equipped with a grille cleaner to trap large particles and fibrous debris. The intercepted debris is automatically transferred to a waste bin and is regularly cleared and transported by the environmental sanitation department.

The wastewater treatment process involves multi-faceted mixing in the sludge pond, adjusting water volume, and initially degrading organic compounds. Subsequently, the treated wastewater is pumped into an anaerobic pond via submersible pumps. In the anaerobic pond, the recycled mixture is further mixed with the original wastewater. Through the action of aerobic microorganisms, nitrite and nitrate nitrogen are converted into nitrogen gas, completing denitrification and nitrogen removal. The effluent from the anaerobic pond then flows automatically to the contact oxidation pond.

The Contact Oxidation Tank is a biological treatment control system predominantly using biofilm technology, incorporating aspects of activated sludge process. It utilizes blowers to supply oxygen sources, allowing organic compounds in the wastewater to come into multifaceted contact with the biofilm within the tank. Through the action of microbial adsorption and degradation, the water quality is purified and treated.

The effluent from the second sedimentation pond now meets the first-class standards of the "Wastewater Discharge Standards" and is discharged into the surrounding rivers.

The sludge from the secondary sedimentation tank is pumped to the aerobic tank by the sludge recycle pump on a regular schedule, leaving a reduced amount of sludge. The remaining sludge is cleaned and removed every two months by sanitation vacuum trucks for disposal.

The oxygen required for the biochemical operating system is supplied by blowers, and the aeration operating system utilizes blowers with micro-porous aeration pipes. Special consideration has been given to the excessive noise from the blowers, so the blower room has been designed as an acoustic insulation and noise reduction facility.

In summary: The aforementioned is a general process for wastewater treatment in food processing plants. It is hoped that in the future, the general process of wastewater treatment in food processing plants will focus on overall optimization, rather than the optimization of a single stage.