Several Common Wastewater Treatment Process Technologies in Pharmaceutical Companies

Explore the most effective wastewater treatment process technologies for pharmaceutical companies. Learn about physical, chemical, and biological treatment methods—such as coagulation, Fenton oxidation, anaerobic–aerobic systems, and membrane bioreactors—that efficiently remove organic pollutants, toxins, and salts from pharmaceutical wastewater to achieve discharge compliance and sustainability.

Pharmaceutical manufacturing is a resource-intensive process that generates large volumes of complex and toxic wastewater. These effluents typically contain organic compounds, active pharmaceutical ingredients (APIs), solvents, heavy metals, salts, and synthetic by-products that are difficult to degrade biologically.

The main sources of pharmaceutical wastewater include:

• Antibiotic production wastewater
• Synthetic drug production wastewater
• Traditional Chinese medicine (TCM) extraction wastewater
• Washing and cleaning wastewater from formulation workshops

Such wastewater often exhibits high chemical oxygen demand (COD), deep coloration, toxicity, and poor biodegradability, making it one of the most challenging industrial waste streams to treat effectively.

Due to its high organic load and chemical complexity, pharmaceutical wastewater usually cannot meet discharge standards through biochemical treatment alone. Therefore, pretreatment is crucial to remove solids, neutralize pH, and improve biodegradability before biological treatment.

A comprehensive treatment train generally includes:

1. pretratamiento (equalization, pH adjustment, physical–chemical removal)
2. Anaerobic treatment (for high-strength organic load reduction)
3. Aerobic treatment (for further COD and BOD removal)
4. Post-treatment (membrane filtration, adsorption, or oxidation polishing)

A well-designed system follows the “pretreatment → anaerobic → aerobic → polishing” route, ensuring compliance with discharge standards such as GB8978-1996.

Physical–chemical methods are typically used as pretreatment or polishing steps to remove suspended solids, color, and refractory organics.

Key methods include:

• Coagulation and Flocculation:
  Commonly used with aluminum sulfate, polyferric sulfate, or polymeric coagulants. Advanced coagulants, such as high-efficiency composite flocculant F-1, can achieve up to 87% color removal y 70% COD reduction, outperforming traditional PAC or PAM agents.
• Air Flotation:
  Techniques like dissolved air flotation (DAF) o vortex concave air flotation effectively remove oils, solids, and floating matter. Typical COD removal can reach 25–40% in pretreatment.
• Adsorption:
  Usando Carbón activado, ash, or resin to remove residual organics and improve biodegradability. For example, coal ash adsorption followed by biological treatment increased COD removal by 41%.
• Membrane Separation:
  Technologies such as nanofiltration (NF) y reverse osmosis (RO) enable recovery of valuable compounds while reducing pollution load. Studies show nanofiltration effectively separates antibiotics and enhances biodegradability.
• Electrolysis:
  An efficient decolorization and oxidation technique, achieving COD and SS removal rates above 70% in riboflavin wastewater.

Some pharmaceutical waste streams contain recoverable compounds such as formaldehyde, solvents, and active intermediates.
Example: A high-tech pharmaceutical enterprise used a gas blow-off method to recover formaldehyde, reusing it as formalin reagent o fuel, cutting treatment costs and achieving payback within 4–5 years.

This approach aligns with clean production principles—reducing pollution while enhancing material efficiency.

When physical–chemical pretreatment is insufficient, chemical oxidation technologies are used to degrade refractory organics.

• Iron–Carbon (Fe–C) Method:
  Acts as an effective pretreatment to improve wastewater biodegradability. Combined systems such as Fe–C → anaerobic → aerobic achieve COD removal above 90% and meet national discharge standards.
• Fenton Reagent (Fe²⁺/H₂O₂):
  Highly effective in oxidizing complex organics. Enhanced variants (e.g., photo-Fenton) achieve COD removal up to 92% and complete decolorization.
• Ozone (O₃) Oxidation:
  Removes persistent organics and improves BOD₅/COD ratio by over 75%.
• Advanced Oxidation Processes (AOPs):
  Include UV/TiO₂ photocatalysis, ultrasound, and supercritical water oxidation.
  Ultrasonic–aerobic treatment of pharmaceutical wastewater achieved 96% total COD removal—a promising new direction.

Biological treatment remains the core process for most pharmaceutical wastewater treatment systems. It can be aerobic, anaerobic, or combined.

Used after pretreatment to remove biodegradable organics.
Common systems include:

• Activated Sludge
• Contact Oxidation
• Sequencing Batch Reactor (SBR)
• Cyclic Activated Sludge System (CASS)
• Deep Well Aeration

For example, the deep well aeration system achieved COD removal of 92.7% in high-strength wastewater, showing stable and efficient oxygen utilization.

Preferred for high-COD wastewater, where organic load exceeds 10,000 mg/L.
Typical systems:

• Upflow Anaerobic Sludge Blanket (UASB)
• Anaerobic Baffled Reactor (ABR)
• Upflow Anaerobic Filter (UAF)
• Hydrolysis–Acidification (HUSB)

los UASB system achieves COD removal above 85–90%, while hydrolysis–acidification pretreatment enhances biodegradability and reduces treatment costs.

The most widely used approach for pharmaceutical wastewater, combining anaerobic degradation with aerobic polishing.
Examples include:

• Micro-electrolysis → Anaerobic → SBR
• Hydrolysis–Acidification → Contact Oxidation
• Anaerobic → Aerobic → Catalytic Oxidation

These hybrid systems deliver COD removal rates of 90–95% and strong resilience against shock loads.

An advanced process combining biological degradation with membrane filtration, offering:

• Compact footprint
• High-quality effluent
• Reduced sludge generation
• Strong adaptability

Case: An anaerobic–MBR system treating acid chloride wastewater with COD 25,000 mg/L achieved >90% COD removal, showing great promise for high-strength pharmaceutical wastewater.

Pharmaceutical wastewater treatment requires a multistage, integrated process combining physical–chemical pretreatment, biological degradation, and advanced polishing.
Due to the variability and complexity of effluent composition, no single method can achieve consistent results across all applications.

To ensure sustainable operation and regulatory compliance:

• Combine pretreatment + anaerobic + aerobic + advanced oxidation or MBR.
• Promote clean production y waste minimization at the source.
• Explore resource recovery to unify economic and environmental benefits.

Developing cost-effective hybrid technologies y intelligent monitoring systems will be key to the next generation of pharmaceutical wastewater treatment processes.

Because it contains toxic, non-biodegradable, and highly variable organic compounds, often requiring multi-stage treatment.

A combined anaerobic–aerobic biological process, often followed by membrane separation o oxidation polishing.

By improving pretreatment, optimizing chemical dosing, and recovering valuable substances like solvents and formaldehyde.

It helps degrade refractory organics and enhances biodegradability for downstream biological treatment.

Membrane bioreactors (MBR), ultrasonic oxidation, and AI-controlled hybrid systems are leading trends in high-efficiency wastewater management.

Xian CHIWATEC Water Treatment Technology es una empresa de alta tecnología especializada en varios dispositivos de procesamiento de agua. Aparte de estos productos individuales, que cubren una serie de tipos y series, también podemos ayudar con proyectos de ingeniería integrales relacionados. Gracias a nuestro arduo trabajo y dedicación desde nuestra fundación, ahora somos uno de los fabricantes de equipos de tratamiento de agua de más rápido desarrollo en el oeste de China.

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