EWC Code
Phosphatising sludges
EUR-Lex Commission Decision 2000/532/EC — Official Journal L 226, 06/09/2000Annual Volume (EU)
1.4 million tonnes/year EU non-electrolytic surface treatment waste
Valorisation Range
€210M phosphating and chemical treatment waste market
Primary Route
Phosphating sludge treatment and recovery
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Get contacts for EWC 11 01 08EWC 11 01 08 is a specific sub-code under EWC 11 02 — Wastes from non-electrolytic metal surface treatment processes. The classification guidance below applies to this waste stream.
Non-electrolytic metal surface treatment generates phosphating sludge, chemical conversion coating waste, passivation solution and rinse water as primary waste streams. Iron phosphating and zinc phosphating pre-treatments before paint application on automotive bodies produce approximately 1.5–3 kg sludge per tonne of steel treated, rich in iron, zinc and phosphate compounds.
Chemical blackening of steel using alkaline permanganate or selenious acid solutions generates waste containing manganese or selenium compounds classified as hazardous. Chromate conversion coatings, historically used for passivation of aluminium and zinc, contain hexavalent chromium (Cr(VI)) classified H350 (carcinogen). EU RoHS and REACH have driven replacement of hexavalent chromate with trivalent chromium or chrome-free alternatives on most applications.
Phosphating bath maintenance generates spent bath solution requiring treatment by precipitation, filter pressing and hazardous waste disposal. Rinse waters require treatment through wastewater plant with metals removed by chemical precipitation to meet discharge consent limits. Iron phosphating sludge is typically non-hazardous while zinc phosphating sludge is classified hazardous where zinc exceeds threshold.
Typical Generators
Established valorisation pathways for EWC 11 01 08, ranked by economic value and market depth.
Phosphating sludge is filter-pressed to >40% solids, dewatered cake sampled and characterised. High-zinc sludge is sold to zinc smelters as secondary zinc feed where zinc content exceeds 15%. Iron-dominant phosphating sludge is used as iron supplement in cement kiln raw meal or disposed as hazardous waste after chemical fixation.
Rinse waters from phosphating and passivation lines are treated in on-site wastewater treatment plant using lime precipitation to remove dissolved metals. Treated effluent monitored against discharge consent limits (Zn <2 mg/L, Cr total <0.5 mg/L). Sludge from treatment plant filter-pressed and characterised for disposal route.
Legacy hexavalent chromate wastes and chromate conversion coating rinse concentrates are treated by chemical reduction (Cr(VI) to Cr(III)) before precipitation and disposal. If Cr(VI) residual >0.1 mg/L in eluate, managed as hazardous waste and disposed to hazardous landfill with double-liner and leachate collection.
These are the established routes for EWC 11 01 08. Which one your stream qualifies for depends on its composition, volume and region.
Get the ranked options for your streamPrimary & secondary off-takers
Treat phosphating and passivation process waste on-site through integrated wastewater plant
Accept high-zinc phosphating sludge as secondary zinc feed for refining
Use iron-bearing phosphating sludge as iron supplement in cement kiln raw meal
Accept and treat chromate-bearing hazardous waste from surface treatment operations
Sectors that valorise EWC 11 01 08 as an input material or secondary raw material.
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