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  ?

• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• B09C 1/08 - Reclamation of contaminated soil chemically
• C02F 11/00 - Treatment of sludgeDevices therefor
• B01J 20/00 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof
• G21F 9/12 - Processing by absorptionProcessing by adsorptionProcessing by ion-exchange
• A62D 3/33 - Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemically fixing the harmful substance, e.g. by chelation or complexation
• B09B 3/70 - Chemical treatment, e.g. pH adjustment or oxidation
• C02F 101/20 - Heavy metals or heavy metal compounds
• C02F 101/10 - Inorganic compounds
• B09B 101/30 - Incineration ashes
• B09B 101/90 - Soil, e.g. excavated soil from construction sites

Abstract

A process for curbing of emissions of toxic metals and chelating agent from remediated soils, sediments and other substrates contaminated with toxic metals, said process comprising: (a) remediation of contaminated soil, sediment and other substrate with washing solution, said washing solution comprising EDTA or other chelating agent from the group of aminopolycarboxylic acids and their salts and mixtures thereof; (b) addition of 0.05-5% (w/w, dry weight) of zero-valent Fe or Fe compounds from the group of Fe-oxides and Fe-oxide-hydroxides into the slurry phase of soil, sediment and other substrate; (c) mixing of Fe-amended slurry; (d) separation of solid phase of remediated and Fe-amended soil, sediment and other substrate; (e) ageing of remediated and Fe-amended soil, sediment and other substrate for 0.5-45 days.

IPC Classes  ?

• B09C 1/00 - Reclamation of contaminated soil
• B09C 1/08 - Reclamation of contaminated soil chemically
• B09C 1/02 - Extraction using liquids, e.g. washing, leaching

Abstract

A batch process of remediation of soil and sediment contaminated with toxic metals includes the steps of treating contaminated soil and sediment with a solution containing aminopolycarboxylic chelating agent, rinsing the soil/sediment solid phase to remove residues of mobilized toxic metals, treating the used process waters to recycle chelating agent and clean process solutions and placing the remediated soil/sediment on a permeable horizontal reactive barrier to prevent emission of contaminants. In the batch process, toxic metals are removed from process solutions by alkaline adsorption of polysaccharide adsorbents. By applying alkaline adsorption the efficiency of toxic metal removal from process solutions and alkaline and acidic recycling of chelating agent is significantly improved.

IPC Classes  ?

• B09C 1/00 - Reclamation of contaminated soil
• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• A62D 3/33 - Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemically fixing the harmful substance, e.g. by chelation or complexation
• B09C 1/08 - Reclamation of contaminated soil chemically
• G21F 9/06 - Processing
• G21F 9/10 - Processing by flocculation
• G21F 9/12 - Processing by absorptionProcessing by adsorptionProcessing by ion-exchange
• B01J 20/00 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof
• B01D 11/02 - Solvent extraction of solids
• B09C 1/10 - Reclamation of contaminated soil microbiologically or by using enzymes
• C02F 1/28 - Treatment of water, waste water, or sewage by sorption
• 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
• A62D 101/24 - Organic substances containing heavy metals
• C02F 101/20 - Heavy metals or heavy metal compounds

Abstract

The process and device according to invention "Process and device to control harmful cyanobacterial blooms" solve the problem of the massive occurrence of cyanobacterial growth, which is a serious threat to human and environmental health because of the co-occurring biosynthesis of toxic, genotoxic and cancerogenic compounds. The process is based on strategic triggering of the lytic cycle of the lysogenic cyanobacteria in spatially separated parts of the population and the release of viruses to spread viral infection to weaken and destroy the entire cyanobacterial population, and on thermal destratification of the subsurface waters and hydrologic disturbance of the cyanobacteria in their habitat. The strategic triggering of the lytic cycle and water destratification are made possible by a device comprising a service docking station in the bank of the water body and a mobile working platform that floats freely and is able autonomously to cover an extensive water surface.

IPC Classes  ?

• C02F 3/34 - Biological treatment of water, waste water, or sewage characterised by the microorganisms used
• A01N 59/00 - Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• A01N 63/00 - Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
• C12N 1/06 - Lysis of microorganisms
• A61L 2/04 - Heat
• C12R 1/91 - Cell lines
• C02F 1/02 - Treatment of water, waste water, or sewage by heating
• C02F 1/461 - Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
• C02F 103/00 - Nature of the water, waste water, sewage or sludge to be treated

Abstract

The process "Washing contaminated soils" solves the problem of cleansing and remediating soils and sediments and their fine fractions contaminated with toxic metals, using washing solution with chelating agents. The chelating agent forms water-soluble complexes with metals and thus facilitates metal removal from soils and sediments into the washing solution. In addition to toxic metals, the process according to the invention enables removal of organic pollutants from soils and sediments by using washing solution amended with surfactants, detergents or organic solvents in addition to chelating agents. The process according to the invention provides for simultaneous separation of the soil and sediment solid phase and used washing solution in a chamber filter press, and effective rinsing of the solid phase to remove all residual mobilized contaminants. The process according to the invention recycles chelating agents and process water in a closed process loop by applying a pH gradient and by using advanced oxidation processes for process water cleansing.

IPC Classes  ?

• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• B09C 1/08 - Reclamation of contaminated soil chemically

Abstract

The process "Washing contaminated soils" solves the problem of cleansing and
remediating soils and sediments and their fine fractions contaminated with
toxic metals,
using washing solution with chelating agents. The chelating agent forms water-
soluble
complexes with metals and thus facilitates metal removal from soils and
sediments into the
washing solution. In addition to toxic metals, the process according to the
invention
enables removal of organic pollutants from soils and sediments by using
washing solution
amended with surfactants, detergents or organic solvents in addition to
chelating agents.
The process provides for simultaneous separation of the soil and sediment
solid phase and
used washing solution in a chamber filter press, and effective rinsing of the
solid phase to
remove all residual mobilized contaminants. The process recycles chelating
agents and
process water in a closed process loop by applying a pH gradient and by using
advanced
oxidation processes for process water cleansing.

IPC Classes  ?

• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• B09C 1/08 - Reclamation of contaminated soil chemically

Abstract

Disclosed are batch processes for remediation of soils /sediments contaminated
with toxic
metals, comprising:
(a) washing / leaching a solid phase of contaminated soil /sediment with a
washing
solution;
(b) separating the washing solution from the solid phase;
(c) rinsing of a washed solid phase with one or more rinsing solutions;
(d) subsequent separation of said rinsing solutions;
(e) alkalinisation of used process solutions to between pH 11.5 and pH 13.5
using
calcium containing base;
(f) supplementing polysaccharide material to process solutions treated in step
(e) for
alkaline adsorption of toxic metals;
(g) subsequent separation of the precipitated mixture of used Ca(OH)2 and
metal
hydroxides and polysaccharide material with adsorbed toxic metals from the
used washing
and rinsing solutions; and
(h) re-using of the rinsing solution recycled in step (g) for rinsing the
solid phase in a
subsequent batch process.

IPC Classes  ?

• B09C 1/02 - Extraction using liquids, e.g. washing, leaching

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  ?

• A62D 3/33 - Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemically fixing the harmful substance, e.g. by chelation or complexation
• B01J 20/00 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof
• 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
• C02F 11/00 - Treatment of sludgeDevices therefor
• G21F 9/12 - Processing by absorptionProcessing by adsorptionProcessing by ion-exchange

Abstract

A process for curbing of emissions of toxic metals and chelating agent from
remediated soils,
sediments and other substrates contaminated with toxic metals, said process
comprising:
(a) remediation of contaminated soil, sediment and other substrate with
washing solution, said
washing solution comprising EDTA or other chelating agent from the group of
aminopolycarboxylic acids and their salts and mixtures thereof;
(b) addition of 0.05 ¨ 5% (w/w, dry weight) of zero-valent Fe or Fe compounds
from the
group of Fe-oxides and Fe-oxide-hydroxides into the slurry phase of soil,
sediment and other
substrate;
(c) mixing of Fe-amended slurry;
(d) separation of solid phase of remediated and Fe-amended soil, sediment and
other
substrate;
(e) ageing of remediated and Fe-amended soil, sediment and other substrate for
0.5 - 45 days.

IPC Classes  ?

• B09C 1/02 - Extraction using liquids, e.g. washing, leaching
• B09C 1/08 - Reclamation of contaminated soil chemically