3120.1101 F006
CFR Definition of “Sludge”: “Sludge means any solid, semi-solid, or liquid waste generated from a municipal, commercial, or industrial wastewater treatment plant, water supply treatment plant, or air pollution control facility exclusive of the treated effluent from a wastewater treatment plant”.
Examples:
Wastewater Water Supply Air Pollution Control Treatment Treatment Spun filters Spun filters Bag house dust collection unit Settled Solids Paper filters Cyclones Ion exchange Ion exchange Wet scrubbers resins resins Reverse Osmosis Settled solids Spray booth paint filters concentrate Sand filters media Carbon filter media Wet booth water curtain Carbon filter media Sand filter media Shop vac attached to grinding machines Settled solids Reserves Osmosis Welding ventilation, ie: Smog concentrate hog Evaporator concentrate Filter Press
CFR Definition of F006: “Wastewater treatment sludges from electroplating operations except from the following processes: (1) Sulfuric acid anodizing of aluminum; (2) tin plating on carbon steel; (3) zinc plating (segregated basis) on carbon steel; (4) aluminum or zinc- aluminum plating on carbon steel; (5) cleaning/stripping associated with tin, zinc and aluminum plating on carbon steel; and (6) chemical etching and milling of aluminum”.
Page 1 NOTE: If the waste is not considered F006, it may still be a characteristic or listed hazardous waste. Proper evaluation and testing must be conducted.
CFR Definition of F019: “Wastewater treatment sludges from the chemical conversion coating of aluminum except from zirconium phosphating in aluminum can washing when such phosphating is an exclusive conversion coating process.”
The following is a list of the most common metal finishing operations and information on the classification of waste that may or may not be classified as F006.
Electroplating Processes #1- 3: 1. Common and Precious Metals Electroplating Sludges generated from the treatment of wastewater from common and precious metals electroplating, and treated cleaning and rinse waters associated with electroplating are all classified as F006 waste – See above definition of F006 for exceptions.
2. Chemical Etching and Milling: Chemical Etching/Chemical Milling – EPA’S August 1979 EPA Description – “Chemical milling and etching processes are used to produce specific design configuration and tolerances on metal parts by controlled dissolution with chemical reagents or etchants. Included in this general classification are the specific processes of chemical milling, chemical etching (except when performed on aluminum), bright dipping, electropolishing, and electro chemical machining”. Weather the process involved is electrolytic or not, or whether the process is associated with plating or stand-alone, sludges generated from the treatment of wastewater from all forms of chemical etching and chemical milling are considered F006.
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3. Anodizing: EPA’s February 1984 Guidance Manual states: “Anodizing is an electrochemical process which converts the metal surface to a coating of an insoluble oxide. Aluminum is the most frequently anodized material. The formation of the oxide occurs when the parts are made anodic in dilute sulfuric or chromic acid solutions”. The oxide layer begins formation at the extreme outer surface, and as the reaction proceeds, the oxide grows into the metal”. Sludge generated from the treatment of wastewater from anodizing is F006 except for sulfuric acid anodizing on aluminum, which could be classified as F019 (if using cyanide or chromium anodize solutions).
Nitial Etching – Various acid is utilized to perform non-destructive quality testing on metal parts. The acid does not etch or remove any metal from the part, nor produce a finish on the surface of the metal. This process is not considered F006.
Chromating: If the chromating process is electrolytic, then any waste generated would be classified as F006. Non-electrolytic chromating would be classified under Chemical Conversion Coating and is not considered F006.
Passivation(nitric acid/various other acids)/Passivation with Sodium Dichromate: Covered under Chemical Conversion Coating and is not considered F006.
Black Oxide/Blackening of Ferrous Metals: Covered under Chemical Conversion Coating and is not considered F006.
Pickling: Non-electrolytic process used to remove smut and scale from any metal surface. Any sludge would not be considered F006.
Electroless Plating: Not considered F006 – General waste determination needed.
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Chemical Conversion Coatings: Chromating, phosphating, metal coloring, passivation, and immersion plating(black oxide/blackening of ferrous metals) are not considered F006.
The February 1984 EPA Guidance Manual provides the following definitions for some chemical conversions: Chromating: “In chromating, a portion of the base metal is converted to a component of the protective film formed by the coating solutions containing hexavalent chromium and active organic or inorganic compounds.” Phosphating: “Coatings are formed by the immersion of steel, iron, or zinc plated steel in a dilute solution of phosphoric acid plus other reagents to condition the surfaces for cold forming operation”. Coloring: “Involves the chemical method of converting the metal surface into an oxide or similar metallic compound to produce a decorative finish”. Passivation: “Process of forming a protective film on metal by immersion in an acidic solution, usually nitric acid alone or nitric acid with sodium dichromate”
Printed Circuit Board Manufacturing (“PCBM”) Any wastewater associated with electroplating and/or etching associated with PCBM is considered an F006
DEP Disclaimer: Performing a hazardous waste determination is the responsibility of the generator.
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