Pharmaceutical Factory Antibiotics Wastewater Treatment
Introduction: The antibiotic wastewater from pharmaceutical factories has the characteristics of complex composition, strong biological toxicity, and multiple difficult to degrade substances, and its treatment requires a multi-stage combination process.
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Wastewater characteristics
- High pollution load
The COD concentration usually reaches 10000-80000 mg/L, containing a large amount of residual antibiotics, organic solvents, and intermediate products.
Containing high concentrations of sulfates (SO ₄² ⁻), heavy metals, and acid-base substances, resulting in significant pH fluctuations (4.0-10.0). - Biological inhibition
Antibiotic residues strongly inhibit microbial activity and reduce biochemical treatment efficiency.
Core processing flow
- Pre-processing
Physical interception: Grid filtration removes suspended solids (such as mycelium and medicinal residue).
Advanced oxidation
Fenton method: By decomposing antibiotics and recalcitrant organic compounds with hydroxyl radicals (· OH), the biodegradability is improved (B/C value increases from 0.15 to 0.42).
Ozone oxidation: deep degradation of residual antibiotics.
Coagulation precipitation: Add PAC/PAM to remove colloids and some dissolved organic matter.
Evaporative crystallization (suitable for high salt wastewater): Desalination and recovery of solvents (such as when Cl ⁻>32000 mg/L). - Biological treatment
Anaerobic stage
UASB/EGSB reactor: efficiently degrades COD (removal rate>80%) and generates biogas for energy recovery.
Aerobic stage
SBR/biological contact oxidation: enhances the removal of ammonia nitrogen and organic matter, adapting to water quality fluctuations.
MBR membrane bioreactor: replaces traditional activated sludge process to achieve efficient solid-liquid separation (effluent COD<300 mg/L). - Deep processing
Membrane separation technology
Nanofiltration (NF)/reverse osmosis (RO): deep desalination and removal of small molecule organic matter, with the resulting water reused for production (such as cooling water).
Adsorption and disinfection
Activated carbon adsorption: removes trace residual antibiotics and chromaticity.
UV disinfection: inactivate pathogens and drug-resistant bacteria to ensure sterile effluent
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