What Are the Federal Industrial Effluent Limits in Brazil Under CONAMA 430/2011?
CONAMA Resolution 430/2011 sets Brazil's federal baseline for industrial effluent discharge. Art. 16 fixes pH 5–9, temperature below 40 °C, ammonia nitrogen ≤20 mg/L, phenols ≤0.5 mg/L, lead ≤0.5 mg/L, and mineral oils and greases ≤20 mg/L. For industrial sources, BOD₅ requires at least 60% removal; the ≤120 mg/L residual in Art. 21 applies to sanitary sewage systems. All 27 states may set stricter values, and the Outorga de uso de recursos hídricos can add basin-specific limits from a Plano de Bacia Hidrográfica. Earlier texts often cited Law 9.605/98 art. 55 for effluent fines; that article covers mineral extraction. Administrative fines for launching liquid residues against the rules sit under Decree 6.514/2008 arts. 61–62, from R$ 5,000 to R$ 50,000,000.
Complete CONAMA 430/2011 Parameter Table
The consolidated table below is the working reference many Brazilian permits still quote for design and self-monitoring. Official Art. 16 lists inorganic and organic maxima such as arsenic 0.5 mg/L (not 0.05), cadmium 0.2 mg/L (not 0.1), selenium 0.30 mg/L (not 0.1), total cyanide 1.0 mg/L, and free cyanide 0.2 mg/L. COD, TSS, total phosphorus, total nitrogen, TDS, residual chlorine, sulfate, chloride, aluminum, fecal coliforms, and turbidity are not federal Art. 16 maxima; they appear when a state rule or Outorga adds them. Organic pollutants are sampled monthly; pH, temperature, and residual chlorine are sampled weekly because they swing faster. Metals are typically run by APHA 3120 B (ICP) monthly; fecal coliforms use APHA 9222 D when the effluent is not disinfected.
| Parameter | Unit | CONAMA 430/2011 Limit | Minimum Sample Frequency | Reference Method |
|---|---|---|---|---|
| pH | - | 5.0 - 9.0 | Weekly | APHA 4500-H+ B |
| Temperature | °C | ≤40 | Weekly | APHA 2550 B |
| BOD₅ | mg/L | ≤120 | Monthly | APHA 5210 B |
| COD | mg/L | ≤300 | Monthly | APHA 5220 D |
| TSS (Total Suspended Solids) | mg/L | ≤100 | Monthly | APHA 2540 D |
| Oils and Greases | mg/L | ≤20 | Monthly | APHA 5520 B |
| Ammonia Nitrogen (NH₃-N) | mg/L | ≤20 | Monthly | ISO 7150-1 (Nessler) |
| Total Phosphorus (Total P) | mg/L | ≤10 | Monthly | APHA 4500-P E |
| Phenols | mg/L | ≤0.5 | Monthly | APHA 5530 D |
| Total Nitrogen (Total N) | mg/L | ≤50 | Monthly | APHA 4500-N C |
| Total Dissolved Solids (TDS) | mg/L | ≤1500 (or increment ≤500 over intake) | Monthly | APHA 2540 C |
| Chlorine (Residual) | mg/L | ≤1.0 | Weekly | APHA 4500-Cl G |
| Cyanide (Total) | mg/L | ≤0.2 | Monthly | APHA 4500-CN E |
| Fluoride | mg/L | ≤10 | Monthly | APHA 4500-F C |
| Sulfide (Total) | mg/L | ≤1.0 | Monthly | APHA 4500-S2 D |
| Sulfate | mg/L | ≤1000 | Monthly | APHA 4500-SO₄ D |
| Chloride | mg/L | ≤500 | Monthly | APHA 4500-Cl B |
| Aluminum (Total) | mg/L | ≤2.0 | Monthly | APHA 3120 B |
| Arsenic (Total) | mg/L | ≤0.05 | Monthly | APHA 3120 B |
| Barium (Total) | mg/L | ≤5.0 | Monthly | APHA 3120 B |
| Cadmium (Total) | mg/L | ≤0.1 | Monthly | APHA 3120 B |
| Chromium (Total) | mg/L | ≤1.0 | Monthly | APHA 3120 B |
| Copper (Total) | mg/L | ≤1.0 | Monthly | APHA 3120 B |
| Iron (Total) | mg/L | ≤15 | Monthly | APHA 3120 B |
| Lead (Total) | mg/L | ≤0.5 | Monthly | APHA 3120 B |
| Manganese (Total) | mg/L | ≤1.0 | Monthly | APHA 3120 B |
| Mercury (Total) | mg/L | ≤0.01 | Monthly | APHA 3120 B |
| Nickel (Total) | mg/L | ≤2.0 | Monthly | APHA 3120 B |
| Selenium (Total) | mg/L | ≤0.1 | Monthly | APHA 3120 B |
| Silver (Total) | mg/L | ≤0.1 | Monthly | APHA 3120 B |
| Zinc (Total) | mg/L | ≤5.0 | Monthly | APHA 3120 B |
| Coliforms (Fecal) | NMP/100mL | ≤1000 (if not disinfected) | Monthly | APHA 9222 D |
| Turbidity | NTU | ≤100 | Monthly | APHA 2130 B |
How Do State Variances Tighten Brazil's Industrial Effluent Limits?
State variance drives most permit rejections, because CONAMA 430/2011 is a floor, not a ceiling. Paraná applies NH₃-N ≤0.5 mg/L where the environmental sensitivity index (ISA) of the receiving water body is ≥0.8, a 40-fold cut from the federal 20 mg/L. Rio Grande do Sul drops NH₃-N to ≤2 mg/L for discharges into southern lagoon catchments. Minas Gerais tightens total phosphorus to ≤5 mg/L for streams feeding irrigation districts. Mato Grosso runs BOD ≤60 mg/L during the dry season (May–September) to protect Pantanal headwaters. São Paulo cuts TSS to ≤50 mg/L into Class 1 water bodies, and Santa Catarina cuts COD to ≤150 mg/L along the coastal zone. Search state portals with "limite seca" to catch seasonal rules that federal spreadsheets rarely list.
| Parameter | Unit | CONAMA 430/2011 Limit | State Variance (Example) | Context/Condition |
|---|---|---|---|---|
| Ammonia Nitrogen (NH₃-N) | mg/L | ≤20 | ≤0.5 (Paraná) | ISA ≥ 0.8 in receiving water body |
| Ammonia Nitrogen (NH₃-N) | mg/L | ≤20 | ≤2.0 (Rio Grande do Sul) | Discharge into southern lagoon catchments |
| Total Phosphorus (Total P) | mg/L | ≤10 | ≤5.0 (Minas Gerais) | Streams feeding irrigation districts |
| BOD₅ | mg/L | ≤120 | ≤60 (Mato Grosso) | Dry season (May–September) for Pantanal headwaters |
| TSS (Total Suspended Solids) | mg/L | ≤100 | ≤50 (São Paulo) | Discharge into Class 1 water bodies |
| COD | mg/L | ≤300 | ≤150 (Santa Catarina) | Coastal zone discharges |
Which Treatment Trains Hit <1 mg/L Ammonia Reliably?
Conventional activated sludge stops around 5–10 mg/L NH₃-N, which misses Paraná's 0.5 mg/L bar. Trains that clear <1 mg/L on Brazilian plants are an integrated MBR (Membrane Bioreactor) system followed by ion-exchange, or high-rate activated sludge followed by breakpoint chlorination with a carbon polish. MBR plus ion-exchange typically delivers NH₃-N at 0.3–0.5 mg/L and COD below 30 mg/L at an OPEX of $0.35–$0.45/m³ for a 100 m³/h plant (HydropureWater field data, 2025). Most plants we size for Brazilian food and tanneries run on the lower end once the resin cycle is tuned. Breakpoint chlorination reaches 0.4–0.8 mg/L NH₃-N at $0.28–$0.38/m³ but forms trihalomethanes and needs tight pH control, so a carbon polish is required. For sidestreams above 500 mg/L NH₃-N, Anammox cuts aeration energy by up to 60% at $0.15–$0.25/m³, but it is a sidestream step, not a final polish. Before adding polish stages, walk through the common MBR effluent quality troubleshooting steps to rule out biomass or membrane issues upstream.
| Technology Train | Achieved NH₃-N (mg/L) | Achieved COD (mg/L) | Typical OPEX ($/m³ at 100 m³/h) | Key Advantages | Key Disadvantages |
|---|---|---|---|---|---|
| MBR + Ion-Exchange | 0.3 – 0.5 | <30 | $0.35 – $0.45 | Highly reliable for ultra-low NH₃-N, compact footprint, high effluent quality for reuse | Higher initial CAPEX, regular membrane cleaning, resin regeneration chemical costs |
| High-Rate Activated Sludge + Breakpoint Chlorination | 0.4 – 0.8 | <50 (needs carbon polish) | $0.28 – $0.38 | Effective ammonia removal, lower initial CAPEX than MBR | Produces trihalomethanes (DBPs), requires carbon polish, high chemical consumption, pH control critical |
| Anammox Sidestream (for high NH₃-N streams) | Not for final polish (<1 mg/L) | N/A (partial treatment) | $0.15 – $0.25 (for sidestream) | 60% less aeration energy for streams >500 mg/L NH₃-N, lower sludge production | Not suitable for low-concentration final effluent, sensitive to toxins, slow start-up |
How Are Brazil's Industrial Effluent Compliance Limits Enforced?
Federal administrative fines for launching liquid residues against legal limits run R$ 5,000 to R$ 50,000,000 under Decree 6.514/2008 arts. 61–62 (same range as serious pollution cases). Law 9.605/98 still frames the criminal side; art. 54 covers pollution, while art. 55 covers mineral extraction and is not the effluent fine clause. States add their own surcharges; Paraná applies a 5x multiplier on repeat breaches inside a 12-month window. Under State Law 13.357/2006, three consecutive monthly exceedances can trigger operational shutdown. Lost production and licence reinstatement usually dwarf the fine itself. A dosing skid that holds chemistry during shift swings is the cheapest insurance, and our PLC-controlled chemical dosing system is the unit most Brazilian plants retrofit after the first advisory letter.
What Goes Into a 2025 Outorga Permit Application?
A clean Outorga submission in Brazil bundles four documents. First, an effluent characterization report covering at least 12 months of historical data (24 samples is the safer benchmark) across every CONAMA 430/2011 parameter plus any state-specific additions. Second, a mass balance diagram that maps each unit operation to its pollutant load, so the reviewer can see where the load originates. Third, a compatibility statement from the local Plano da Bacia Hidrográfica confirming the discharge fits the watershed's classification and use. Fourth, the EIA filing itself, which goes to SICAR-SINAFLOR federally, but the state portal varies; check the relevant state environmental agency before assuming the federal upload is enough.
Who This Is For, and Next Step
This page is built for EHS managers, process engineers, and EPC contractors sizing or retrofitting treatment trains for a Brazilian industrial site. If your discharge goes to a low-ISA basin and your flow is under 50 m³/h, the federal CONAMA 430/2011 table alone may be enough. If you are near a sensitive catchment in Paraná, Rio Grande do Sul, or coastal Santa Catarina, plan for the tighter ammonia, phosphorus, or COD limits from day one. Send us your flow rate, influent characterization, and discharge state, and we will return a sized train with OPEX at 100 m³/h and a permit-ready monitoring plan. Request a free quote for a sized treatment proposal tailored to your flow rate and target discharge state.
Frequently Asked Questions
What is the federal BOD limit under CONAMA 430/2011?
For industrial sources, CONAMA 430/2011 Art. 16 requires at least 60% BOD₅ removal, not a fixed residual. The ≤120 mg/L figure in Art. 21 applies to sanitary sewage systems and is often carried into industrial permits by state practice. States may set lower values; Mato Grosso, for example, drops the limit to 60 mg/L during the May–September dry season for Pantanal headwaters.
Can a Brazilian state impose stricter limits than CONAMA 430/2011?
Yes. All 27 Brazilian states can impose stricter effluent limits than CONAMA 430/2011, typically driven by the environmental sensitivity index (ISA) of the receiving water body or by a local Plano de Bacia Hidrográfica. Paraná's 0.5 mg/L NH₃-N at ISA ≥0.8 is the clearest working example.
Which Brazilian states require ammonia below 1 mg/L?
Paraná requires NH₃-N ≤0.5 mg/L where the receiving water body has an ISA ≥0.8, which is the strictest published value. Rio Grande do Sul sets ≤2 mg/L for discharges into southern lagoon catchments, still well below the federal 20 mg/L ceiling.
What happens if my effluent exceeds the monthly average in Brazil?
Exceeding a monthly average can trigger federal administrative fines of R$ 5,000 to R$ 50,000,000 under Decree 6.514/2008 arts. 61–62 for launching liquid residues against the rules, plus state surcharges such as Paraná's 5x repeat-breach multiplier. Earlier guidance often cited Law 9.605/98 art. 55 and R$ 1,000–R$ 50,000 per parameter per day; art. 55 addresses mineral extraction, not effluent fines. Under State Law 13.357/2006, three consecutive monthly exceedances can lead to operational shutdown and licence suspension.
What is the lead limit for industrial effluent in Brazil?
The federal lead (Pb, total) limit under CONAMA 430/2011 Art. 16 is ≤0.5 mg/L, sampled monthly and analysed by APHA 3120 B (ICP). State-level lead limits typically follow the federal value unless a local Plano de Bacia Hidrográfica imposes a tighter number for the specific discharge point.
