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[Bulking controls induced by nitrogen insufficiency in yeast system]
Yun Han1, Qingxiang Yang, Min Yang
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, CAS, Beijing 100085, China.
Huan Jing Ke Xue= Huanjing Kexue
|October 14, 2003
Summary
Adding nitrogen to salad oil wastewater treatment improves oil removal and sludge settling. This method is effective in preventing sludge bulking, achieving high removal rates at specific COD/N ratios.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Bioremediation
Context:
- Salad oil manufacturing generates wastewater with high oil content.
- Sludge bulking is a common operational problem in wastewater treatment systems.
- Optimizing nutrient addition is crucial for efficient biological treatment.
Purpose:
- To investigate the impact of nitrogen addition on oil removal efficiency in salad oil wastewater.
- To assess the effect of nitrogen on sludge settleability and control of sludge bulking.
- To determine optimal Chemical Oxygen Demand (COD) to Nitrogen (N) ratios for wastewater treatment.
Summary:
- Batch experiments showed nitrogen addition improved oil removal (>90%) and sludge settleability, particularly at COD/N ratios between 50/1 and 20/1.
- Continuous experiments demonstrated sustained high oil (>95%) and COD (>90%) removal rates at a COD/N ratio of 20/1.
- Nitrogen addition effectively prevented or controlled sludge bulking, with sludge volume index (SVI) values between 100 and 200.
Impact:
- Provides an effective strategy for managing nitrogen-deficient industrial wastewater.
- Offers a method to enhance the performance and stability of biological wastewater treatment systems.
- Contributes to sustainable practices in the food processing industry by improving wastewater treatment efficacy.