Successful solution for high nitrogen content wastewater treatment from rendering plants

Area of Science:

• Environmental Engineering
• Wastewater Treatment Technologies
• Industrial Microbiology

Background:

• Rendering plant wastewater presents unique treatment challenges due to high chemical oxygen demand (COD) and nitrogen levels.
• Conventional activated sludge processes struggle with instability, filamentous bulking, nitrification inhibition, and denitrification issues.
• High temperatures (up to 40°C) further complicate biological treatment processes.

Purpose of the Study:

• To investigate and implement effective strategies for the stable and efficient treatment of rendering plant wastewater.
• To achieve effluent standards for total inorganic nitrogen (TIN) and COD.

Main Methods:

• Implementation of precise control over pH and temperature.
• Biocatalytic nutrient dosage and addition of suitable external carbon sources.
• Management strategies to mitigate inhibitory effects on microbial processes.

Main Results:

• Successful operation of four regional wastewater treatment plants was achieved.
• Effluent quality consistently met required standards for TIN (≤ 60 mg/l) and COD (≤ 200 mg/l).
• Addressed issues of sludge bulking, nitrification inhibition, and denitrification limitations.

Conclusions:

• Optimized operational parameters and targeted interventions enable effective treatment of challenging rendering plant wastewater.
• The implemented strategies ensure stable plant performance and compliance with environmental discharge regulations.