Abstract

The present invention relates to a batch process for washing of soil, sediment, sludge and other Fe containing substrates to remove toxic metalloids, notably As and Sb, and toxic metals, notably Pb, Zn, Cd, Cu, Ni, Hg, Mo, Mn, Tl, Cr, Cs, Sr, Th and U. The present invention aids in treatment of waste washing and rinsing solutions generated from washing the substrate contaminated with toxic metalloids and with toxic metals. The invention furthermore aids in reclamation of washing and rinsing solutions, reagents and other materials, and in activation of recycled chelator for more efficient removal of toxic metals from substrate.

IPC Classes  ?

• C02F 9/00 - Multistage treatment of water, waste water or sewage
• B09B 3/70 - Chemical treatment, e.g. pH adjustment or oxidation
• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• B09C 1/08 - Reclamation of contaminated soil chemically
• B09B 101/30 - Incineration ashes
• B09B 101/90 - Soil, e.g. excavated soil from construction sites
• C02F 1/28 - Treatment of water, waste water, or sewage by sorption
• C02F 1/42 - Treatment of water, waste water, or sewage by ion-exchange
• C02F 1/66 - Treatment of water, waste water, or sewage by neutralisationTreatment of water, waste water, or sewage pH adjustment
• C02F 1/68 - Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
• C02F 1/70 - Treatment of water, waste water, or sewage by reduction
• C02F 11/00 - Treatment of sludgeDevices therefor
• C02F 101/10 - Inorganic compounds
• C02F 101/20 - Heavy metals or heavy metal compounds
• C02F 101/22 - Chromium or chromium compounds, e.g. chromates