Effluent discharge limits in Egypt
Egypt does not have one industrial effluent number. A factory connected to a public sewer is regulated very differently from one discharging to the Nile, a canal, an agricultural drain, groundwater or the coast. Choosing the wrong table can turn a compliant pretreatment plant into an illegal direct discharge.
For industrial discharge to a public sewer, Ministerial Decree 44 of 2000 under Law 93 of 1962 allows BOD₅ 600 mg/L, COD 1,100 mg/L, TSS 800 mg/L, oil and grease 100 mg/L and pH 6.0–9.5. These are admission limits to a sewer, not final environmental discharge limits.
Direct discharge is much stricter. The EEAA’s regulatory table for Law 48 of 1982 gives, for example, BOD₅/COD/TSS of 20/30/30 mg/L to groundwater or Nile branches and canals, 30/40/30 mg/L to the Nile main stream, and 60/80/50 mg/L to municipal drains. Confirm the exact receiving-water classification and permit before fixing a design basis.
The discharge route decides the standard
| Destination | Primary legal route | What it means |
|---|---|---|
| Public sewer / municipal treatment works | Law 93 of 1962, Executive Regulation as amended by Ministerial Decree 44 of 2000 | Pre-treatment admission limits protect the network and municipal plant. Obtain the sewer authority’s approval. |
| Nile, branches, canals, groundwater, agricultural drains | Law 48 of 1982 on protection of the Nile and watercourses, with its executive rules | Direct-discharge limits are materially tighter and route-specific. A permit is required. |
| Coastal environment | Environmental Law 4 of 1994, as amended, and its executive regulations | Coastal limits and project-specific environmental approval apply. |
| Reuse / irrigation | Separate reuse requirements under the sanitation and water framework | Do not assume a discharge-quality effluent is automatically approved for reuse. |
Industrial wastewater admitted to a public sewer
These are the national baseline figures most relevant to an industrial site that discharges to a public or private wastewater collection system. A receiving utility may impose tighter trade-effluent conditions, especially where capacity or process inhibition is a concern.
| Parameter | Maximum limit | Relevance to a DAF plant |
|---|---|---|
| pH | 6.0–9.5 | Acidic iron or aluminium coagulants consume alkalinity; neutralisation may be required. |
| Temperature | 43 °C | Hot CIP, condensate and wash-down streams need equalisation/cooling. |
| BOD₅ | 600 mg/L | Usually achievable as a sewer-admission target after DAF removes the particulate share. |
| COD | 1,100 mg/L | High by direct-discharge standards; still not a licence to overload a downstream biological plant. |
| Total suspended solids | 800 mg/L | DAF is highly effective for this duty. |
| Oil and grease | 100 mg/L | DAF’s core duty; protect the sewer and municipal works. |
| Total nitrogen | 100 mg/L | Confirm local conditions where ammonia can inhibit the receiving works. |
| Total phosphorus | 25 mg/L | Often manageable with iron dosing at flotation. |
| Cyanide | 0.2 mg/L | Separate destructive treatment; never mix with acid. |
| Phenols | 0.05 mg/L | Not a flotation-only problem. |
| Hexavalent chromium | 0.5 mg/L | Reduce Cr(VI) first, then precipitate chromium hydroxide. |
| Total heavy metals | 5 mg/L | Requires pH control, precipitation and solid-liquid separation. |
Direct discharge to water: the key figures
The following comparison is useful for early process selection. It is not a substitute for the permit table: Law 48 distinguishes the receiving environment, and the authority can set further conditions in the discharge licence.
| Parameter, mg/L unless stated | Coast | Groundwater / Nile branches / canals | Nile main stream | Municipal drains | Industrial drains |
|---|---|---|---|---|---|
| BOD₅ | 60 | 20 | 30 | 60 | 60 |
| COD | 100 | 30 | 40 | 80 | 100 |
| Total suspended solids | 60 | 30 | 30 | 50 | 50 |
| Oil and grease | 15 | 5 | 5 | 10 | 10 |
| pH | 6–9 | 6–9 | 6–9 | 6–9 | 6–9 |
| Temperature | Maximum 10 °C above receiving water | 35 °C | 35 °C | 35 °C | 35 °C |
| Total dissolved solids | 2,000 | 800 | 1,200 | 2,000 | 2,000 |
What this means for plant design in Egypt
- Do not design a direct-discharge plant to sewer figures. COD 1,100 mg/L is an admission threshold; a canal target of 30 mg/L COD is a completely different process train.
- DAF belongs at the front of a food, dairy, abattoir, edible-oil or high-solids plant. It removes fats, oils and suspended solids before biology. It does not remove the soluble COD needed to reach 20–40 mg/L direct-discharge targets.
- Canal and Nile discharge needs tertiary thinking from day one. A DAF followed by biological treatment, final solids separation and, where needed, polishing is the credible route—not a DAF alone.
- Set the coagulant chemistry against the final dissolved-solids target. The 800 mg/L TDS target for groundwater, branches and canals leaves little room for a saline influent plus high chemical dose.
- Get the discharge point recognised early. Sewer connection, outfall, drain and reuse are separate approvals. The right engineering question is “where is the final permitted discharge?”
Permits, sampling and enforcement
For sewer discharge, obtain written acceptance and conditions from the competent sanitation authority before commissioning. For a watercourse discharge, the Ministry responsible for water resources issues the relevant permission under Law 48. The Egyptian Environmental Affairs Agency’s inspection guidance identifies both regimes and notes that the competent administrative authority takes samples to establish a violation. Keep an upstream and final-effluent sampling point, flow record and treatment operating log; do not rely on a once-off laboratory result.
Source and verification
| Sewer instrument | Law 93 of 1962 concerning discharge of liquid wastes; Executive Regulation amended by Ministerial Decree 44 of 2000 |
| Watercourse instrument | Law 48 of 1982 concerning protection of the Nile and watercourses from pollution |
| Environmental regulator | Egyptian Environmental Affairs Agency (EEAA) |
| Water regulator | Ministry of Water Resources and Irrigation |
| Sources | UNEP/FAOLEX text record for Decree 44/2000 · Ministry of Water Resources — Law 48/1982 · EEAA industrial wastewater self-monitoring manual |
| Checked | 7 August 2026 |
Frequently asked questions
What is the COD limit for industrial wastewater in Egypt?
It depends on destination. The Decree 44/2000 sewer-admission limit is 1,100 mg/L COD. The EEAA comparison for Law 48 watercourse discharges gives 30 mg/L to groundwater, Nile branches and canals; 40 mg/L to the Nile main stream; 80 mg/L to municipal drains; and 100 mg/L to industrial drains. Check the permit before relying on any one number.
Can a DAF meet Egyptian discharge limits on its own?
It can often meet the sewer-admission limits for suspended solids and oil and grease, and it substantially reduces particulate COD. It will not take a typical industrial organic effluent to 20–40 mg/L COD or BOD for direct discharge. That needs biological treatment and often polishing after the DAF.
Can an Egyptian factory discharge treated water to a public sewer?
Yes, subject to the Law 93/1962 regime and the sanitation authority’s approval. The national figures are admission limits; the receiving utility can impose tighter conditions or demand specific pre-treatment.
Which rule applies to discharge into the Nile?
Law 48 of 1982 and its executive rules govern discharge to the Nile and watercourses. The standard differs between the Nile main stream, branches/canals and drains, and a permit is required.