CONAMA Resolution 430/2011 (issued by Brazil's National Environment Council) set strict parameters for the discharge of industrial effluents, with a direct impact on the electroplating sector. Electroplating shops that fail to comply face heavy fines, operating shutdowns and reputational damage.

Boreto & Cardoso®, with more than 53 years in the chemical market (since 1972), supplies specialized inputs for electroplating wastewater treatment. Our experience covers supply to treatment systems in a range of industrial sectors, including electroplating.

This technical guide presents a complete compliance system based on current legislation and best practices in electroplating wastewater treatment.

Executive Summary

  • CONAMA 430/2011 tightened the limits for pH, heavy metals and COD
  • Proper treatment systems are mandatory for legal operation
  • Metal recovery can lower the operating costs of the wastewater treatment plant (WWTP)
  • Preventive compliance avoids fines and operating shutdowns
  • The right chemical inputs are essential for efficient treatment

How Can You Ensure Full Compliance for Electroplating Wastewater?

The question that drives environmental consultants and technical specialists: how do you make sure an electroplating shop meets 100% of the CONAMA 430/2011 parameters?

The answer lies in designing an integrated system that takes into account:

✅ The 4 Pillars of Full Compliance:

  1. Complete wastewater characterization - Analysis of every bath in use
  2. Proper technical sizing - A system proportional to the actual load
  3. Qualified operation - A team trained in preventive maintenance
  4. Continuous monitoring - Control of critical parameters

⚠️ Main Pitfalls That Lead to Noncompliance:

  • Undersizing the WWTP to save on initial costs
  • Improper mixing of effluents with incompatible chemical characteristics
  • Lack of pH control at different stages of the process
  • No emergency system for production peaks
  • Reactive rather than preventive maintenance
  • Unsuitable or off-spec chemical inputs

CONAMA 430/2011 Legislation and Technical Requirements

📊 Critical CONAMA 430/2011 Parameters:

The legislation sets restrictive parameters that directly affect electroplating shops:

Mandatory Physicochemical Parameters:

Parameter CONAMA 430/2011 Notes
**pH** 5.0 to 9.0 Strict control mandatory
**Total Copper** 1.0 mg/L Common in copper baths
**Total Nickel** 2.0 mg/L Common in finishes
**Total Zinc** 5.0 mg/L Present in processes
**Total Chromium** 0.5 mg/L Most restrictive limit
**COD** Up to 180 mg/L **Critical for electroplating shops**
**Settleable Solids** 1.0 mL/L Settling control

🔥 The Watershed Parameter: COD (Chemical Oxygen Demand)

COD is often the most challenging parameter for electroplating shops, especially those that use:

  • Alkaline degreasers at high concentration
  • Organic acids for pickling
  • Brightener additives with organic components
  • Technical lacquers in finishing processes

⚖️ Consequences of Noncompliance:

Under Law 9,605/98 (Brazil's Environmental Crimes Law):

  • Administrative fines according to the severity of the violation
  • Shutdown orders with immediate suspension of operations
  • Mandatory corrective action with compulsory upgrades within a set deadline
  • Civil and criminal liability for environmental damage

Types of Treatment and Available Technologies

⚙️ Standard Electroplating Treatment System:

Stage 1: Segregation at the Source

  • Acidic effluents (pH < 2): Pickling and activation baths
  • Alkaline effluents (pH > 12): Degreasing and preparation
  • Metal-bearing effluents (Cu, Ni, Zn, Cr): Bath rinse waters
  • Organic effluents (high COD): Lacquers and auxiliary products

Stage 2: Primary Neutralization

For acidic effluents:

  • Hydrated lime (Ca(OH)₂) - Cheaper, generates more sludge
  • Caustic soda (NaOH) - Less sludge, better pH control

For alkaline effluents:

  • Sulfuric acid (H₂SO₄) - Industry standard
  • Hydrochloric acid (HCl) - For specific cases

Stage 3: Metal Precipitation

Optimal pH range by metal:

  • Copper: pH 8.5 to 9.0
  • Nickel: pH 9.5 to 10.0
  • Zinc: pH 8.0 to 8.5
  • Chromium: pH 7.5 to 8.0

Stage 4: Coagulation/Flocculation and Settling

Inputs used:

  • Polyaluminum chloride - Primary coagulant
  • Aluminum sulfate - Alternative coagulant
  • Polyelectrolytes - Flocculant for particle aggregation
  • Retention time: 45-60 minutes
  • Dosage control: Essential for efficiency

Stage 5: Tertiary Treatment (COD Reduction)

To meet the 180 mg/L COD limit:

  • Activated carbon filtration - Most common
  • Advanced oxidation with hydrogen peroxide - Higher efficiency
  • Biological treatment - For large volumes

🔬 Advanced Recovery Technologies:

Metal Recovery System:

  1. Selective ion exchange - High recovery efficiency
  2. Electrodialysis - For highly concentrated solutions
  3. Reverse osmosis - Concentration before recovery
  4. Electrolysis - Direct recovery of copper and nickel

Boreto & Cardoso® Chemical Inputs for Wastewater Treatment

🧪 Complete Treatment Portfolio:

Boreto & Cardoso® supplies specialized inputs for every stage of treatment:

Acids for Neutralization:

  • Hydrochloric Acid - Neutralization of alkaline effluents
  • Sulfuric Acid - Standard for pH control
  • Phosphoric Acid - Specific applications

Alkalis for Neutralization:

  • Caustic Soda (NaOH) - Liquid and flakes
  • Hydrated Lime - Cost-effective neutralization
  • Soda Ash (Sodium Carbonate) - pH control and precipitation

Coagulants and Flocculants:

  • Polyaluminum Chloride (PAC) - High-efficiency coagulant
  • Aluminum Sulfate - Traditional coagulant
  • Ferric Chloride - For specific cases
  • Sodium Aluminate - Coagulation aid
  • Polyelectrolytes - Flocculants for aggregation

Oxidizers for Tertiary Treatment:

  • Hydrogen Peroxide - Oxidation of organic matter
  • Sodium Hypochlorite - Oxidation and disinfection
  • Calcium Hypochlorite - Alternative for oxidation

Auxiliary Products:

  • Copper Sulfate - Control of specific processes
  • Barium Chloride - Sulfate precipitation
  • Sodium Metabisulfite - Reduction of hexavalent chromium
  • Sodium Hydrosulfite - Chemical reduction
  • Sodium Sulfite - Reduction and deoxygenation

✅ What Sets Boreto & Cardoso® Apart:

Assured Quality:

  • 53 years of experience (since 1972) in the chemical market
  • Products from certified suppliers
  • Strict technical specifications for each product
  • Full traceability of every batch

Regulatory Compliance:

  • Complete, up-to-date SDS (Safety Data Sheet)
  • Certificates of analysis with specific parameters
  • Products compliant with environmental legislation
  • Complete documentation for audits

Specialized Logistics:

  • Proper storage for hazardous products
  • Safe transport with complete documentation
  • Scheduled deliveries for continuous operation
  • Service from São Paulo and Limeira

Implementation and Validation Checklist

✅ Pre-Project Checklist:

📋 Phase 1: Technical Diagnosis

  • [ ] Complete characterization of all effluents generated
  • [ ] Analysis of the baths in use and their concentrations
  • [ ] Flow measurement across different production shifts
  • [ ] Assessment of the current WWTP (if any)
  • [ ] Review of licenses and environmental documentation
  • [ ] Analysis of the space available for installation
  • [ ] Technical and economic feasibility study

📋 Phase 2: Detailed Design

  • [ ] Calculation report for sizing
  • [ ] Technical specification of equipment
  • [ ] Detailed layout with process flowchart
  • [ ] List of chemical inputs required
  • [ ] Execution and commissioning schedule
  • [ ] Training plan for operators
  • [ ] Monitoring and maintenance protocols

✅ Operating Checklist:

📋 Daily Checks:

  • [ ] pH measurement at all critical points
  • [ ] Dosage control of chemicals
  • [ ] Visual check of settling
  • [ ] Record of volumes treated
  • [ ] Inspection of equipment in operation

📋 Weekly Checks:

  • [ ] Metals analysis of treated effluent
  • [ ] COD measurement for tertiary control
  • [ ] Stock check of inputs
  • [ ] Preventive maintenance of dosing pumps
  • [ ] Cleaning of settling tanks

📋 Monthly Checks:

  • [ ] Full analysis according to CONAMA 430
  • [ ] Calibration of measuring instruments
  • [ ] Review of operating protocols
  • [ ] Operating team training
  • [ ] Compliance report for the environmental agency

⚡ Key Performance Indicators (KPIs):

Technical:

  • Removal efficiency: > 95% for metals
  • pH stability: Within the 5.0 to 9.0 range
  • COD compliance: Consistently < 180 mg/L
  • Solids control: < 1.0 mL/L settleable solids

Operational:

  • System availability: As high as possible
  • Response time: Fast response to anomalies
  • Analytical compliance: 100% of CONAMA 430 parameters
  • Input consumption: Within design values

Environmental:

  • CONAMA 430 compliance: 100% of parameters
  • Zero environmental citations
  • Resource recovery: As designed
  • Complete documentation for audits

Methodology for Sustainable Compliance

🎯 Preventive Compliance Program:

1. Initial Diagnosis

  • Complete technical audit of the electroplating operation
  • Mapping of environmental and operational risks
  • Identification of metal recovery opportunities
  • Analysis of current input consumption

2. Correct Sizing

  • Calculation based on the actual load with a safety margin
  • Selection of technologies suited to the size of the operation
  • Specification of the right chemical inputs
  • Integration with existing systems where possible

3. Controlled Implementation

  • Supply of specialized Boreto & Cardoso® inputs
  • Treatability tests with actual products
  • Dosage adjustments for maximum efficiency
  • Validation of compliance with CONAMA 430

4. Sustainable Operation

  • Continuous monitoring protocols
  • Scheduled preventive maintenance
  • Stock control of critical inputs
  • Ongoing process optimization

📊 Critical Success Factors:

  1. Correct sizing: Adequate safety margin
  2. Proper segregation: Separate incompatible effluents
  3. Quality inputs: Products within specification
  4. Controlled dosing: Calibrated, working equipment
  5. Preventive maintenance: A strict cleaning schedule
  6. Operator training: A continuously trained team
  7. Complete documentation: SDS, certificates, analyses

Next Steps: How Boreto & Cardoso® Can Help

📦 Specialized Supply of Inputs:

Boreto & Cardoso® offers:

  1. A complete portfolio of wastewater treatment inputs
  2. Quality products from certified suppliers
  3. Complete technical documentation (SDS, certificates of analysis)
  4. Full traceability of every batch supplied
  5. Specialized logistics for hazardous products

📞 Contact Us for a Quote:

Headquarters - Santana de Parnaíba/SP:

  • Email: boreto@boreto.com.br
  • Phone: (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.

Compliance as a Responsibility

Proper treatment of electroplating wastewater is a legal obligation and an environmental responsibility. Electroplating shops that invest in compliant systems avoid regulatory risk and also:

✅ Operate legally under current legislation
✅ Avoid fines and shutdowns for noncompliance
✅ Protect the environment through proper discharge
✅ Strengthen their reputation with environmental certification
✅ Can recover metals, lowering operating costs

Boreto & Cardoso® is proud to have supplied specialized chemical inputs for wastewater treatment for more than 53 years (since 1972). Our experience in the chemical market, combined with certified suppliers and full traceability, allows us to offer reliable products for treatment systems.

Preventive compliance starts with quality inputs.

📞 Need inputs for electroplating wastewater treatment? Get in touch and explore our complete portfolio.

📞 (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 only and does not constitute, on the part of Boreto & Cardoso, any indication of application, formulation or direct recommendation of use.
Boreto & Cardoso®, with 53 years of experience, operates strictly as a supplier of chemical inputs for a wide range of applications, and each user is responsible for verifying the suitability and compliance of their own application.