Neutralization is a key step in electroplating wastewater treatment. Strict pH control is required by CONAMA Resolution 430/2011 (Brazil's federal standard for effluent discharge), which sets a mandatory range of 5.0 to 9.0 for the discharge of industrial effluents.
Boreto & Cardoso®, with 53 years of experience in the chemical market (since 1972), supplies specialized inputs for effluent neutralization with complete technical documentation.
Why Is Neutralization Critical?
Inadequate neutralization leads to noncompliance with CONAMA 430/2011, resulting in:
- Administrative fines under Law 9.605/98 (Brazil's Environmental Crimes Law)
- Suspension of activities and operational shutdown
- Civil and criminal liability for environmental damage
pH (5.0 to 9.0) is one of the seven mandatory parameters for electroplating shops.
The Neutralization Step in Treatment
Neutralization is Step 2 of the complete electroplating wastewater treatment system, positioned after segregation and before metal precipitation.
Acid Effluents (pH < 2)
Coming from:
- Pickling baths
- Activation processes
- Acid rinse water
Alkaline Effluents (pH > 12)
Coming from:
- Degreasing processes
- Surface preparation
- Alkaline rinse water
Inputs for Neutralizing Acid Effluents
1. Caustic Soda (NaOH)
Characteristics:
- Form: liquid or flakes
- Advantages: less sludge generated, better pH control
- Application: neutralization of acid effluents
Technical specifications:
- High purity
- Fast dissolution
- Precise dosing
2. Hydrated Lime (Ca(OH)₂)
Characteristics:
- Form: fine powder
- Advantages: more economical
- Consideration: generates more sludge
Application:
- Neutralization of large volumes
- Systems with structured sludge management
3. Soda Ash (Sodium Carbonate, Na₂CO₃)
Characteristics:
- Form: light or dense
- Application: fine pH control
- Advantage: gentle neutralization
Use:
- Precise pH adjustments
- Complement to the main neutralization
Inputs for Neutralizing Alkaline Effluents
1. Sulfuric Acid (H₂SO₄)
Characteristics:
- Industry standard
- High efficiency
- Good cost-benefit
Application:
- Neutralization of alkaline effluents
- pH control in automated systems
Specifications:
- Controlled purity
- Concentration suited to the system
- Safe storage mandatory
2. Hydrochloric Acid (HCl)
Characteristics:
- Application: specific cases
- Concentration: as required
Use:
- Processes that tolerate chlorides
- Systems with no chlorine restrictions
3. Phosphoric Acid
Characteristics:
- Application: specific
- Advantage: lower corrosivity in some applications
pH Control in Treatment Systems
CONAMA 430/2011 Legal Range
Mandatory parameter:
- pH: 5.0 to 9.0
- Strict control required
- Continuous monitoring recommended
Recommended Operating Range
For greater safety and stability:
- Ideal range: 6.5 to 7.5
- A safety margin within the legal limits
- Less variation means more stability
Dosing Systems
Manual dosing:
- Less precise
- Higher reagent consumption
- Greater risk of variation
Automatic dosing:
- Precise control
- Optimized consumption
- Stable pH 24/7
- Recommended for sustainable compliance
Why Input Quality Matters
Poor Inputs Cause:
- Unstable pH: variations outside the legal range
- Excessive consumption: higher operating costs
- Noncompliance: fines and shutdowns
- System damage: corrosion or scaling
Quality Inputs Ensure:
- Efficient treatment: pH within limits
- A stable process: fewer variations
- Optimized consumption: correct dosages
- Compliance: meeting CONAMA 430
Mandatory Technical Documentation
SDS (Safety Data Sheet)
Mandatory for all inputs:
- Product identification
- Chemical composition
- Safety measures
- First aid
- Exposure control
Certificates of Analysis
For every lot:
- Parameters analyzed
- Results obtained
- Technical specifications
- Traceability
Technical Specifications
Detailed documentation:
- Product purity
- Concentration
- Controlled impurities
- Recommended applications
Boreto & Cardoso®: Specialized Supply
Neutralization Portfolio:
Acids:
- Hydrochloric Acid
- Sulfuric Acid
- Phosphoric Acid
Alkalis:
- Caustic Soda (liquid and flakes)
- Hydrated Lime
- Light/Dense Soda Ash
Why Choose Us:
✅ 53 years of experience (since 1972) in the chemical market ✅ Products from certified suppliers with in-house laboratories ✅ Rigorous technical specifications for every product ✅ Complete traceability for every lot ✅ Up-to-date SDSs and Certificates of Analysis ✅ Complete documentation for environmental audits
Specialized Logistics:
- Proper storage for hazardous products
- Safe transport with complete documentation
- Scheduled deliveries for continuous operation
- Service in São Paulo and Limeira
Neutralization Checklist
Inputs Needed:
- Sulfuric Acid for alkaline effluents
- Caustic Soda for acid effluents
- Backup products for emergencies
- Calibrated dosing system
Operational Controls:
- pH measurement at critical points
- Reagent dosing control
- Record of volumes treated
- Equipment inspection
Documentation:
- SDSs for all products
- Up-to-date Certificates of Analysis
- Record of lots used
- Dosing protocols
Integration with the Other Steps
Neutralization is part of a complete 5-step system:
- Segregation at the Source: separate the streams
- Neutralization: pH 5.0 to 9.0 (this article)
- Metal Precipitation: pH control by metal
- Coagulation/Flocculation: solid-liquid separation
- Tertiary Treatment: COD < 180 mg/L
Every step requires specific inputs for full compliance.
Next Steps
Request a Quote for Inputs:
Headquarters - Santana de Parnaíba/SP:
- Email: boreto@boreto.com.br
- Phones: (11) 3931-1722 | (11) 2366-6260
- WhatsApp: (11) 99108-2229 | (11) 94541-0088 | (11) 91311-3528 | (19) 97685-0233
- Address: R. Alagoas, 30 - Recanto Silvestre, Santana de Parnaíba - SP, 06530-245
Branch - Limeira/SP:
- Phone: (19) 99458-6331
- WhatsApp: (19) 99557-1693
- Address: R. Aratibá, 759 - Centro Industrial de Limeira (CIL), Limeira - SP, 13481-208
Business Hours:
- Monday to Friday: 8:00 a.m. to 12:00 p.m. and 1:15 p.m. to 5:30 p.m.
Information for Your Quote:
- Products required (acids/alkalis)
- Approximate quantities
- Purchase frequency
- Delivery address
Conclusion
Neutralizing electroplating wastewater is a mandatory step for compliance with CONAMA 430/2011. Quality chemical inputs with complete technical documentation are essential to:
✅ Meet the pH parameter (5.0 to 9.0) ✅ Avoid fines and shutdowns ✅ Keep the process stable ✅ Optimize reagent consumption ✅ Demonstrate quality in audits
Boreto & Cardoso® supplies specialized neutralization inputs backed by 53 years of experience in the chemical market.
📞 Need neutralization inputs? Get in touch: 📞 (11) 3931-1722 | 📧 boreto@boreto.com.br
© 2025 Boreto & Cardoso® - Suppliers of Specialized Chemical Inputs since 1972
Note to the reader This article brings together technical information drawn from various sources, with the aim of broadening knowledge about the raw materials mentioned. It is for information purposes only and does not represent any indication of application, formulation or direct recommendation of use on the part of Boreto & Cardoso. With 53 years of experience, Boreto & Cardoso® operates strictly as a supplier of chemical inputs for a wide range of applications, and it is the responsibility of each user to verify the suitability and compliance of their application.