Minimisation and utilisation of waste mineral sludge from sodium perborate production

Abstract

Various approaches to waste minimisation, waste treatment and recycling or safe disposal of the waste mineral sludge from sodium perborate production are presented and critically discussed. Some most promising actions for waste (or its harmful potential) reduction on the production level are identified. These include: a) use of better raw materials (richer boron ore), b) improvement of the ore leaching process, and c) intensification of sludge washing and dewatering. These source reduction measures have already resulted in 50% reduction of boron content in the sludge.

Utilisation of the raw or treated (e.g. dried, compacted) waste sludge could be found in agriculture, civil engineering and construction material production. Agricultural use (as a lime substitute) is based on favourable content of calcium-magnesium minerals and alkali pH value of the sludge, and simultaneous absence of heavy metals. Application in civil engineering (as an aggregate) is possible after calcination, which is costly, or as a cement kiln additive.

Stabilisation of sludge before disposal, when no utilisation is available, is possible by small addition of commercial binders (e.g. Portland cement) or larger amounts of pozzolanic wastes (e.g. coal fly ash).

Keywords

boron-containing sludge waste cement chemical stabilisation solidification calcinations composting utilisation wmr 585-3

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References

BAV (1998) Bioabfallverordnung (Regulations for Biowaste), Bundesministerium Umwelt, Deutschland, 1998/2001.

Cheremisinoff, P.N. & King, J.A. (1991) Waste minimisation, Pollution Engineering, March 1991, pp. 64-72.

Conner, J.R. (1990), Chemical fixation and solidification of hazardous wastes, Van Nostrand-Reinhold, New York, pp. 515-569.

DIN (1984) 38414 S4, Bestimmung der Eluierbarkeit mit Wasser, Deutsche Industrie Normen, DEV, 13.Lieferung, pp. 1-10.

EC (2001) Commission Decision as regards the list of waste, 2001/118/EC.

EC (1999) Council Directive on the landfill of waste, 1999/31/EC.

ECOFIX (1996) Performances AFNOR French Standards Association Leaching Tests, Limay, France.

EEC (1986) Council Directive on the protection of the environment and in particular to soil etc., 86/278/EEC.

Freeman, F.M. (1992) Industrial pollution prevention: A critical overview, Journal of Air & Waste Management Association 42, 5, pp. 618-656.

10.

Garavaglia, R. & Caramuscio, P. (1994) Coal fly-ash leaching behaviour and solubility controlling solids, in: Environmental Aspects of Construction with Waste Materials, Goumans et al. (Eds.), Elsevier Science B.V., pp. 87-102.

11.

Grilc, V. & Petkov'sek, A. (1997) Stabilisation of boron containing sludge with various solidification agents, Waste Management and Research 15, pp. 73-86.

12.

ICCA (1996) International Council of Chemical Associations, Responsible Care - Status Report, Paris.

13.

ISO 14001 (1996) Environmental Management Systems, Specification with guidance for use, First Edn., International Organisation for Standardisation, pp. 1-16.

14.

ÖNORM (1990) S2072 Eluatklassen von Abfällen (Leachate Classes for Wastes), Österreichisches Normungsinstitut, Wien.

15.

PREPARE (1995) Manual of European Working Group on International Research and Development on Cleaner Process and Cleaner Product Systems, Haig, The Netherlands.

16.

Rintelen, C. (1989) Ausbringung von Klärschlamm auf Böden und Klärschlammkompostierung (Application of Sewage Sludge on Soils and for Composting), Österreichische Gesellschaft für Natur- und Umweltschutz, Wien.

17.

UL RS (2000) Regulation on Landfill of Waste, Official Journal of Slovenia, 5/2000 (in Slovene).

18.

van den Sloot, H.A. , Hoede, D. , de Groot, D.J. , van der Wegen, G.J.L. & Quevauviller, P. (1994), Intercomparison of leaching tests for stabilised waste, ECN-C-94-062, ECN, Petten, Netherlands.

19.

Waren, C.J. , Evans, L.J. & Sheard, R.W. (1993) Release of some trace elements from sluiced fly ash on acidic soils with particular reference to boron, Waste Management&Research 11, pp. 3-15.