Compliance Design for Veterinary Pharmaceutical Production Wastewater Treatment Process Scheme

I. General Principles and Core Objectives of Compliance Design

1.1 Design Basis and Regulatory Framework

This compliance design scheme strictly adheres to the current environmental protection laws, regulations, standards, and technical specifications of the People's Republic of China. The core references include:

1. National Standards:

   • Discharge Standard of Water Pollutants for Pharmaceutical Industry(GB 21907-2008) and its amendments.

   • Discharge Standard of Water Pollutants for Chemical Synthesis-Based Pharmaceutical Industry(GB 21908-2008) (Applicable to chemically synthesized veterinary pharmaceuticals).

   • Discharge Standard of Water Pollutants for Blended Formulation Pharmaceutical Industry(GB 21909-2008) (Applicable to formulation production).

   • Discharge Standard of Water Pollutants for Bioengineering-Based Pharmaceutical Industry(GB 21910-2008) (Applicable to bio-fermentation-based veterinary pharmaceuticals).

   • Relevant requirements in the Integrated Wastewater Discharge Standard(GB 8978-1996).

   • Technical Specification for Application and Issuance of Pollutant Discharge Permit Pharmaceutical Industry(HJ 1105-2020).

2. Local Standards: Comply with any special discharge limits or basin-specific discharge standards issued by the project location that are stricter than national standards.

3. Technical Policies: Guidance documents such as the Technical Policy for Prevention and Control of Pollution in Pharmaceutical Industry.

1.2 Characteristics of Veterinary Pharmaceutical Wastewater and Compliance Risk Identification

Veterinary pharmaceutical production wastewater (including synthesis, fermentation, formulation, etc.) has a complex composition and is a key focus of environmental supervision. Its compliance risks lie in:

• High Concentration, High Toxicity: High concentrations of COD, ammonia nitrogen, and total nitrogen, containing residual antibiotics, intermediates, solvents, and other biostatic substances with potential harm to environmental microorganisms.

• Variable Biodegradability: Some wastewater streams have high salinity, refractory organics, and a low B/C ratio.

• Significant Fluctuations in Water Quality and Quantity: Batch production leads to large shock loads in water quality and quantity.

• Characteristic Pollutants: May contain heavy metals, persistent organic pollutants, etc., requiring special attention.

1.3 Core Objectives of Compliance Design

1. Stable Compliance: Ensure that under any normal and specified shock load conditions, the effluent consistently and continuously meets national and local discharge standards, preventing any non-compliant discharge.

2. Risk Prevention and Control: The process design must have sufficient buffering capacity, redundancy, and emergency treatment capability to handle abnormal situations such as production fluctuations and equipment failures.

3. Whole-Process Control: Achieve compliant design for the entire process from wastewater collection, pretreatment, main treatment, to sludge disposal and exhaust gas control, preventing secondary pollution.

4. Verifiable Monitoring: The system design should facilitate the installation of online monitoring instruments and include standardized sampling points to meet self-monitoring and supervisory monitoring requirements.

5. Standardized Management: Process layout, equipment selection, piping identification, and operating procedures should comply with relevant environmental, safety, and occupational health management codes.

II. Whole-Process Process Design Based on Compliance Requirements

To ensure compliance throughout the entire process from source to outlet, this scheme adopts an integrated route of "Categorized Collection, Quality-Based Pretreatment, Enhanced Biological Treatment, Advanced Control, Safe Disposal". The core of compliance lies in establishing multiple barriers and incorporating specialized control units for characteristic pollutants.

2.1 Whole-Process Compliance Framework Diagram

III. Key Compliance Design Points for Critical Units

3.1 Compliant Design for Source Segregation and Collection

• Quality-Based Segregation: Strict implementation of "segregated storm and foul sewers, segregated foul sewers based on quality" is mandatory. Establish independent corrosion-resistant, anti-seepage collection tanks/pipelines for wastewater from different workshops and of different natures (e.g., high-concentration broth, high-salinity wastewater, heavy metal-containing wastewater, general rinse water), with clear labeling. This is the foundation for effective pretreatment and total load control.

• Emergency Holding Tank: An Emergency Holding Tank of sufficient volume must be installed at the inlet front end of the wastewater treatment plant to store wastewater during production accidents, equipment failures, or spills of high-concentration materials, preventing shock loads on the treatment system. Its volume should comply with regulations, typically not less than the maximum single batch wastewater volume or 24-hour composite wastewater generation.

3.2 Compliance Enhancement Design for Pretreatment Units

• Targeting Characteristic Pollutants: For wastewater containing components inhibitory to microorganisms, an Advanced Oxidation Pretreatment (e.g., Iron-Carbon Micro-electrolysis, Fenton's Reagent, Ozone Oxidation) must be installed for "ring-opening and detoxification" to destroy the activity of antibiotics and other biostatic agents, improving wastewater biodegradability. This is a key compliance step to ensure the stable operation and compliance of subsequent biological units.

• Equalization Tank for Homogenization and Buffering: The hydraulic retention time (HRT) of the composite equalization tank should be sufficiently long (typically ≥ 24 hours), equipped with aeration or mixing devices to fully homogenize quality and attenuate shock loads. Bypass pipelines should be installed to allow temporary storage or safe disposal of wastewater during pretreatment unit maintenance.

3.3 Compliance Assurance Design for Main Biological Treatment Unit

• Process Selection: The "Hydrolysis Acidification + Two-Stage A/O (Anoxic/Oxic) combined with MBR (Membrane Bioreactor)" is adopted as the core process.

  • Hydrolysis Acidification: Improves biodegradability.

  • Two-Stage A/O: Provides sufficient denitrification and nitrification capacity, ensuring stable compliance of Total Nitrogen (TN), a difficult and key compliance point in veterinary pharmaceutical wastewater treatment.

  • MBR: Replaces the traditional secondary clarifier, achieving efficient solid-liquid separation via membrane filtration. It yields effluent with extremely low suspended solids, maintains high biomass concentration, has strong shock load resistance, and provides stable and reliable effluent quality. It is a powerful technical means to ensure stable compliance of COD and ammonia nitrogen.

• Design Redundancy: The biological system design load should have margin to ensure stable compliance capability even with fluctuating influent concentrations.

3.4 Compliant Design for Advanced Treatment and Discharge Outlet

• Advanced Oxidation Safeguard: An Ozone Catalytic Oxidation or similar advanced treatment unit is installed after biological treatment as a "polishing" measure to further remove refractory COD, color, and trace characteristic pollutants, ensuring that core indicators like final effluent COD remain absolutely compliant even during occasional fluctuations in the biological system.

• Standardized Discharge Outlet:

  1. Open Channel Metering: The discharge outlet must be a standardized open channel such as a Parshall flume or rectangular weir, equipped with an ultrasonic flow meter for continuous flow measurement.

  2. Online Monitoring: A dedicated monitoring shelter must be constructed at the discharge outlet, installing and connecting online automatic monitoring equipment for COD, ammonia nitrogen, pH, flow, etc. Monitoring data must be transmitted in real-time to the environmental protection department.

  3. Sampling Platform: A standardized and safe manual sampling platform must be set up to facilitate supervisory monitoring.

3.5 Compliant Design for Co-treatment of Wastes and Hazardous Waste Management

• Sludge Disposal: Biological and physicochemical sludge may contain drug residues and must be identified. Usually, it must be managed as hazardous waste. After thickening and dewatering (moisture content < 60%), it should be handed over to a unit holding the corresponding category of hazardous waste operation license for safe disposal, following the manifest system.

• Exhaust Gas Control: Exhaust gases generated from equalization tanks, biological tanks, sludge treatment units, etc., should be enclosed and collected, directed to an exhaust gas treatment system (e.g., alkali scrub + bio-deodorization, activated carbon adsorption, RTO, etc.), ensuring compliance with plant boundary odor and VOC standards.

IV. Compliance Monitoring, Management, and Emergency Response Plan

• Monitoring System Development:

  • Online Monitoring: Continuous monitoring of flow, COD, ammonia nitrogen, pH, etc.

  • Self-Monitoring: Regular laboratory analysis of total nitrogen, total phosphorus, characteristic pollutants, acute toxicity, etc., as required by the pollutant discharge permit, maintaining monitoring records.

• Compliant Operation Management: Develop detailed Process Operating Procedures, Equipment Maintenance Procedures, Safety Production Procedures, and Environmental Management Systems. Operators should be certified, and operating records should be complete and traceable.

• Emergency Response Plan Filing: Develop the Environmental Emergency Contingency Plan, file it with the environmental protection department. Conduct regular drills, stockpile emergency supplies to ensure rapid response under abnormal conditions and prevent pollution incidents.

V. Conclusion

This compliance design scheme is fundamentally based on the principles of stable compliance, controllable risks, and whole-process conformance. Through targeted process combinations, redundant system design, stringent end-of-pipe controls, and a comprehensive monitoring and management system, it provides a full-scope compliance solution for veterinary pharmaceutical production wastewater treatment facilities from construction to operation. Implementing this scheme not only ensures the enterprise meets the most stringent current environmental regulations but also effectively manages environmental risks, fulfills corporate social responsibility, and lays a solid environmental foundation for the enterprise's sustainable development.