Biotreatment of As-containing hydroxide sludge

Details Biotreatment of As-containing hydroxide sludge Biotreatment of As-containing hydroxide sludge

2007-06-27

2008-09-09

Barry, Chester T. (Department: 1797)

Liquid purification or separation

Processes

Treatment by living organism

C210S610000, C210S611000, C210S742000

Reexamination Certificate

active

07422687

ABSTRACT:
The invention discloses a biotechnological process for the treatment of hydroxide sludge containing As produced in potable water production processes which use FeCI3as a coagulant. The process seeks to modify the physicochemical properties of the produced sludge in such a way to facilitate the use of mechanical dehydration methods that allow decreasing the sludge volume and facilitating its final disposal. The process entails: Preparation of an inoculum of sulfate reducing microorganisms from the sludge to be treated; Combining the sludge to be treated, the SRB inoculum, and nutrients at a controlled temperature for about 5 days in an anaerobic reactor with enough mixing to allow sludge homogenization such that no untreated zones remain; Decanting the treated sludge for a period of approximately 3 days, recovering the clarified liquid and subjecting the sediment to a dewatering process through filtration or centrifugation; Filtering the solid residue coming from the decanter; and Characterizing the final residue.

REFERENCES:
patent: 6387669 (2002-05-01), Truex et al.
Galvin. “Hydroxide Sludge Management.”Ingenieria Quimica. Jun. 1998. pp. 173-178.
Catica et al. “Abatement of Turbidity and Color in Conventional Plants Under Altiplanic Winter Condition.”XIII Chilean Congress on Sanitary and Environmental Engineering. Oct. 1999.
Slater et al. “Disposal of Waterworks Sludge: Final Report of Research Panel No. 14.”Panel from Engineering Subcommittee of the Joint Research Steering Committee of the Institute of Water Engineers and the Society for Water Treatment and Examination. Oct. 1973. pp. 399-409.
Undebarrena. “Thermal Dehydration of Sludge in the Industrial Field.”Tratamiento de Lodos. Jun. 1999.
Coates et al. “Microbial Perchlorate Reduction: Rocket-Fuelled Metabolism.”Nature Reviews/Microbiology. vol. 2. Jul. 2004. pp. 569-580.

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