California Waste Code · Sludges
Phosphate sludge
Waste Family
Sludges
Waste Code
431
Regulation
22 CCR App. XII
California waste codes come from 22 CCR Division 4.5, Chapter 11, Appendix XII. A California code is required on the hazardous waste manifest for every load generated in or shipped into California — even for wastes that are hazardous only under California law and carry no federal code.
RCRA-regulated streams list a federal RCRA waste code on the manifest alongside code 431.
Named process sludges: alum and gypsum, lime, phosphate, sulfur, degreasing, paint, paper and pulp, tetraethyl lead, and unspecified sludge waste.
Recognized recovery routes for this waste family, ranked by typical recovery tier. Which route fits depends on your specific stream — composition, volume and region.
Metal-bearing streams route to high temperature metals recovery or hydrometallurgical processing, where the contained metals are extracted and returned to commerce as secondary raw material.
40 CFR 268.42 Table 1 — HTMR technology standardBelow economic recovery concentrations, stabilization to the applicable treatment standard followed by controlled disposal remains the default management route.
40 CFR 268.40 — LDR treatment standardsThese are the typical routes for sludges. Your stream's actual options depend on its composition and where it sits.
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