Decontamination of soils, Part 2

Flotation – a reliable technology in solid hazardous waste treatment

Quelle/Source:www.chemieonline.de

Leistungsbeiwert Ne zur Reynoldsschen Zahl Re eines Rushton-Rührwerks • Power number Ne vs. Reynolds number Re for a Rushton stirrer

Quelle/Source:www.chemieonline.de

Quelle/Source: SKET

Umgebaute 1500-l-Unterluftmaschine vom Typ Denver • Modified 1500 liter Denver type sub-aeration machine

Quelle/Source: SKET

Quelle/Source: STAPELFELDT and RICHTER, 2002

Bleirausbringen bezogen auf Natriumsulfidkonzentration und pH-Wert • Lead recovery vs. sodium sulphide concentration and pH

Quelle/Source: STAPELFELDT and RICHTER, 2002

Zinkausbringen bezogen auf Natriumsulfidkonzentration und pH-Wert • Zinc recovery vs. sodium sulphide concentration and pH

Quelle/Source: STAPELFELDT and RICHTER, 2002

Erste Flotationsversuche mit geändertem Sammler (Kaliumamylxanthat) und entsprechender pH-Wert • Preliminary flotation tests performed by variation of collector (Potassium Amyl Xanthate) vs. pH

Quecksilberkonzentration im Schaumprodukt und Behandlungseffizienz gegenüber Sulfidierung • Mercury concentration in the froth product and treatment efficiency vs. sulphidisation

Ergebnisse des TCLP-Tests mit behandeltem Boden (Berge) aller drei durchgeführten Versuchsreihen (grün - Versuchsreihe B: 1000 mg/kg; purpurrot - Versuchsreihe C: 800 mg/kg und türkis - Versuchsreihe D: 1200 mg/kg) • TCLP test results performed with the treated soil (tailings) of all three test rows performed (green; test row B: 1000 mg/kg; purple; test row C: 800 mg/kg and turquoise; test row D: 1200 mg/kg)

Quelle/Source: courtesy of Highlands Remediation

Mobile Bodenwaschanlage von Highlands Remediation in Syracuse/New York • Mobile soil washing plant of Highlands Remediation in Syracuse/New York

Quelle/Source: courtesy of Highlands Remediation

Summary: Flotation is a reliable solution for remediating contaminated soils. In the first part of the paper, published in AT 6/2013, pp. 60-72, the author gave an overview of soil washing technology with reference to dedicated plants in the Netherlands, Belgium, Germany, Austria and Switzerland. Part 2 of the paper focuses on the latest research findings based on forward-pointing flotation tests for the recovery of metals and mercury from contaminated soils on an industrial scale.

2 Implementation of flotation in existing soil washing plants

The first application of froth flotation in a physical-chemical soil washing plant (Fig. 10) in Germany was performed by RICHTER, SCHMIDT ET AL. (1997) [22] in a soil treatment facility in Berlin by up-grading the existing plant with modified Fahrenwald type sub-aeration machines provided by the German vendor SKET. Using common flotation reagents from coal processing, several thousand metric tons of highly organically contaminated soil with polycyclic aromatic hydrocarbons (PAHs) greater than or equal to 20 000 [mg/kg DW] were...