Objective Cyanide emissions in gas scrubbing water from blast furnaces in daily use and in B.F. rundowns sometimes constitute considerable pollution in an aquatic medium. The cyanide destruction solution adopted consists of having cyanized effluents react with formaldehyde to form glyconitril. The purpose of this research was to identify and develop criteria for regulating the cyanide reduction process so as to ensure permanent adjustment of the reactive dose. In that context, our work was coordinated with that of the I.R.H. which identified and studied various indicators of the reactive medium condition.According to the results of this survey, cyanide and formaldehyde polarographic analysis proves to be a very suitable technique for formaldehyde treatment of blast furnace effluents.Unlike the previous exploratory research the work will focus exclusively on blast furnace scrubbing water, examining in particular plants which have to treat the offtake from closed scrubbing water circuits. Special attention will be devoted to a plant having recently opted for this type of treatment. The work will supplement the determination and monitoring of reagent dispensing in an experimental installation functioning in tandem without the addition of H2O2. Broadly, the programme of work will consist of: - selection of parameters to indicate complete reaction and/or presence of excessive reagent which are compatible with instrument-based measurement in and industrial environment; laboratory and, if possible, in situ testing and validation of measurement of the parameter(s) selected; - study of the strategy for adjusting the dose of reagent taking due account of the inertia of the measuring system, that of the treatment process reactor and of the dynamics of effluent variation; - overseeing of process implementation; assessment of performance and identification of areas for possible improvements and modifications as regards monitoring effluent before and after treatment and as regards the technique for regulating reagent dispensing. Programme(s) ECSC-WORKENV 5C - Fifth research programme (ECSC) "Technical control of nuisances and pollution at the place of work and in the environment of iron and steel works", 1985-1989 Topic(s) 2 - Measures to combat fresh and sea water pollution Call for proposal Data not available Funding Scheme Data not available Coordinator Centre Belge d'Etude et de Codumentation des Eaux (CEBEDEAU) EU contribution No data Address Rue Armand Stevart, 2 4000 Liege Belgium See on map Total cost No data
