UAE Oil and Grease Discharge Limit in 2026: The Headline Numbers
The oil and grease discharge limit in the UAE is set by Federal Decree-Law No. 12 of 2026 on environmental protection (which replaced Federal Law No. 24 of 1999), the Dubai Municipality Industrial Wastewater Technical Guideline (DM-PHED-GU04), and sector regulators including ADLIC for refining and ADNOC for upstream oil and gas. The general FOG limit follows a three-tier structure: 10 mg/L for discharge to marine outfalls, 50 mg/L for discharge to a municipal sewer, and 100 mg/L for on-land disposal or hazardous-waste transfer. Industrial facilities typically see influent FOG of 150–700 mg/L, with refining and marine streams reaching 2,000–10,000 mg/L, which is why a DAF plus MBR or DAF plus coalescing-plate train is the standard configuration to meet the 10 mg/L threshold.
| Discharge route | FOG limit (mg/L) | Enforcing instrument | Typical sector |
|---|---|---|---|
| Marine outfall (open water) | 10 | Federal Decree-Law 12/2026; MoIAT marine discharge guidance | Refineries, produced water, coastal facilities |
| Municipal sewer (indirect discharge) | 50 | DM-PHED-GU04; local municipality | Food processing, HORECA, metalworking |
| On-land disposal / hazardous-waste transfer | 100 | MOCCAE; Federal Authority for Identity, Citizenship, Customs & Port Security for transboundary shipment | Isolated sites, landfill leachate, tank-farm washdown |
| Refining-specific marine (ADNOC/ADLIC) | 5 | ADLIC sector code; ADNOC SHE Standards | Onshore refining, gas processing |
The 5 mg/L ADLIC figure is the tightest FOG ceiling in the country and is non-negotiable for any facility holding an ADLIC operating permit. Non-compliance penalties are scheduled in Cabinet Decision No. 12 of 2026, starting at AED 50,000 for a first violation and scaling to licence revocation for willful or repeat breaches.
Which Authority Enforces the FOG Limit in Each Emirate
Federal Decree-Law 12/2026 is administered by the Ministry of Climate Change and Environment (MOCCAE), which acts as the federal backstop and issues national policy guidance. Submitting to the wrong agency is a common reason permit applications stall. In Abu Dhabi, the Department of Municipalities and Transport (DMT) acts through ADLIC for industrial wastewater, while ADNOC enforces additional FOG specifications for any facility inside its concession area or supplying its onshore processing hubs.
Dubai operates a parallel system through the Dubai Municipality Environment, Health and Safety Department, which applies the DM-PHED-GU04 technical guideline. Sharjah routes enforcement through Sharjah City Municipality for industrial discharge and the Sharjah Electricity, Water and Gas Authority (SEWA) for any connection to a municipal treatment plant. The Northern Emirates — Ajman, Umm Al Quwain, Ras Al Khaimah, and Fujairah — each rely on the local municipality, with MOCCAE retaining federal oversight for facilities crossing emirate boundaries or discharging to federal waters. Refining and petrochemical sites should expect dual jurisdiction: ADNOC for process specifications and ADLIC for environmental permitting.
Influent FOG Concentrations by UAE Industry Sector
Raw FOG concentrations across the four dominant UAE industrial categories span two orders of magnitude, meaning no single DAF sizing rule applies. Sizing a treatment train starts with knowing the influent load rather than the permit limit.
| Sector | Influent FOG (mg/L) | Typical BOD / COD (mg/L) | Target discharge |
|---|---|---|---|
| Refining & petrochemical (ADNOC onshore) | 200–2,000 (produced water up to 5,000) | BOD 150–400 / COD 400–1,200 | 5 mg/L marine (ADLIC) |
| Food processing & HORECA | 500–1,500 | BOD 800–2,500 / COD 1,500–4,000 | 10–50 mg/L sewer/marine |
| Metalworking & automotive parts | 150–700 (per Filtox automotive benchmark) | BOD 60–320 / COD 200–1,000 | 10 mg/L marine or reuse |
| Marine & shipyards (bilge, washdown) | 1,000–10,000 | BOD 200–600 / COD 500–1,500 | 10 mg/L marine; MARPOL Annex IV for vessels |
For the 10 mg/L marine ceiling, the paired envelope is BOD below 50 mg/L, COD below 125 mg/L, TSS below 50 mg/L, and pH 6–9 (per DM-PHED-GU04 Section 4.2). A refinery targeting 5 mg/L will need tighter polishing and a stable biological stage because the ADLIC audit tolerance is effectively zero excursions above the limit. For more on the broader discharge envelope, see the 2026 petrochemical wastewater discharge standard.
Treatment Train That Achieves the 10 mg/L FOG Limit
A four-stage train typically reduces a 500 mg/L FOG stream to under 5 mg/L through documented stage-by-stage removals. The configuration below is the working sequence most EPC contractors specify for UAE industrial sites targeting the marine 10 mg/L limit or the ADLIC 5 mg/L limit.
| Stage | Unit operation | Removal efficiency | Effluent FOG (mg/L) |
|---|---|---|---|
| 1 | API or wave-plate gravity separator | 60–80% free oil | 50–200 |
| 2 | Dissolved Air Flotation with PAC + anionic polymer | 85–95% emulsified oil | 5–30 |
| 3 | Coalescing plate or fiber-bed polisher | 50–80% residual | 1–5 |
| 4 | MBR with PVDF flat-sheet membranes | Polishing to non-detect; TSS < 5 mg/L | < 1 |
Stage 1 removes free oil by density difference and protects downstream equipment from slug loads. Stage 2 is the workhorse: an industrial DAF system dosed with 50–150 mg/L polyaluminium chloride and 1–3 mg/L anionic polymer typically drops a 200 mg/L feed to 10–30 mg/L, with hydraulic residence time around 20–30 minutes. Stage 3 is mandatory whenever the target is below 10 mg/L — a coalescing plate pack with oleophilic media captures the sub-20 µm droplets that DAF air bubbles miss.
Stage 4 uses an MBR membrane bioreactor with a PVDF flat sheet MBR membrane at 0.1–0.4 µm nominal pore size, delivering effluent FOG below 1 mg/L and TSS below 5 mg/L while running MLSS at 8,000–12,000 mg/L — about 60% less tankage than conventional activated sludge. Float sludge from the DAF stage is routed to a plate-and-frame filter press for volume reduction before consignment as hazardous waste. For operations teams, the DAF unit maintenance guide walks through the daily checks that keep the air-saturation and skimmer systems at nameplate efficiency. Procurement teams sizing equipment for the region can reference the DAF system supplier buyer's guide for the specifications that matter in a Gulf climate.
Sampling Protocol, Monitoring Frequency, and 2026 Penalties
UAE regulators require a 24-hour flow-weighted composite collected by an automatic sampler, paired with a grab sample for the visual sheen test, both analysed per APHA 5520 B (partition-gravimetric) or 5520 D (partition-infrared). Sampling points must be downstream of the final polishing stage, upstream of any dilution tank, and fitted with a secured, tamper-evident composite cooler.
Self-monitoring frequency is monthly for any facility with a marine discharge permit and quarterly for municipal sewer discharges, with unannounced regulator spot sampling permitted under DM-PHED-GU04 Section 7. Lab certificates, chain-of-custody forms, calibration logs, and flow records must be retained for a minimum of three years and produced on demand during an audit.
Penalties are scheduled in Cabinet Decision No. 12 of 2026. A first violation carries a fine of AED 50,000 plus a mandatory corrective-action plan with a 30-day closure window. A second violation within 24 months escalates to AED 100,000 and a published non-compliance notice. A third violation, or any willful breach of the ADLIC 5 mg/L marine limit, results in facility shutdown, operating licence revocation, and disqualification from new permits for 36 months. EPC contractors and equipment importers face parallel civil liability where they have certified a non-conforming system, and that exposure is independent of the operator's own penalty.
Frequently Asked Questions
What is the oil and grease discharge limit in the UAE for 2026?
The general limit is 10 mg/L for marine outfall discharge, 50 mg/L for municipal sewer discharge, and 100 mg/L for on-land disposal or hazardous-waste transfer (per Federal Decree-Law No. 12 of 2026 and DM-PHED-GU04). The ADNOC/ADLIC refining sector imposes a tighter 5 mg/L marine ceiling.
Which UAE authority enforces FOG discharge permits?
MOCCAE administers the federal framework. Operationally, ADLIC enforces in Abu Dhabi, Dubai Municipality's Environment, Health and Safety Department enforces DM-PHED-GU04 in Dubai, and Sharjah City Municipality plus SEWA handle Sharjah. ADNOC adds sector-specific oversight for refining and upstream sites.
How is FOG measured for compliance in the UAE?
A 24-hour flow-weighted composite plus a grab sample, both analysed per APHA 5520 B or 5520 D. Lab certificates and chain-of-custody records must be retained for three years (per DM-PHED-GU04 monitoring protocol).
What treatment reliably achieves 10 mg/L FOG?
A DAF unit with PAC and polymer coagulation, followed by a coalescing plate polisher and an MBR with PVDF flat-sheet membranes, consistently delivers below 5 mg/L FOG in UAE industrial duty (Zhongsheng field data, 2026).
What is the penalty for exceeding the
