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COD
Removal Rate:>97%
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Nitrobenzene
Removal Rate:>99%
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TN
Removal Rate:>98%
Introduction
The fine chemical industry faces significant challenges in treating nitrobenzene-aniline wastewater - one of the most stubborn industrial effluents. A breakthrough wastewater treatment upgrade project in Shandong Province has demonstrated how modified Fenton oxidation combined with bioaugmentation can achieve stable compliance while slashing operational costs by 60%. This 300 m³/day retrofit project for a Sinochem subsidiary sets new standards for cost-effective treatment of refractory chemical wastewater.
Project Overview
Challenges in Original Treatment System
The existing Fenton oxidation + contact oxidation process suffered from:
High treatment costs (original cost: ~47.5 RMB/m³)
Unstable TN removal (failing to meet ≤15 mg/L standard)
Excessive chemical consumption
Poor color removal (600-900 times influent color)
Innovative Treatment Process Design
The upgraded system features:
Modified Fenton Oxidation
Enhanced oxidation efficiency
Reduced chemical dosage
Better color removal
Bioaugmentation Process
Specialized microbial consortia
Improved nitrogen removal
Stable organic degradation
Key Retrofit Benefits
60% lower operating costs (19 RMB/m³ vs original 47.5 RMB/m³)
Simpler operation and maintenance
Compact footprint (using existing infrastructure)
Performance & Results
Treatment Efficiency Comparison
Parameter | Influent | Effluent | Removal Rate |
COD | 1,500-2,000 mg/L | ≤ 50 mg/L | > 97% |
Nitrobenzene | 100-150 mg/L | ≤ 0.3 mg/L | > 99% |
Color | 600-900 times | ≤ 30 times | > 95% |
TN | 800-1,200 mg/L | ≤ 15 mg/L | > 98% |
Economic & Environmental Benefits
Annual savings: ~310,000 RMB (for 300 m³/day system)
Reliable compliance with strict discharge standards
Reduced sludge production versus conventional Fenton
Conclusion
This nitrobenzene-aniline wastewater treatment upgrade proves that advanced oxidation combined with bioaugmentation can solve the dual challenges of treatment efficiency and cost reduction in fine chemical plants. The remarkable 60% cost savings make this wastewater treatment retrofit model particularly valuable for chemical manufacturers facing tightening regulations. For industries seeking sustainable solutions for refractory wastewater, this project offers a proven blueprint combining environmental and economic benefits.
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