DEWATERING OF GALVANIC SLURRIES ON ChM FILTER PRESSES

摘要

Waste water and slurries resulting from galvanic production are some of the primary sources of heavy-metal pollution of soils, water bodies, and agricultural lands. At the present time, essentially all establishments of the machine-building, electrotechnical, and other branches of industry utilize similar processes. Familiar methods of cleaning manufacturing discharges consist in their processing in hydroxides of heavy-metal, and separation of the latter in the form of galvanic slurries, the utilization of which is difficult for many establishments; these slurries are therefore earmarked for burial after neutralization. Accumulation of galvanic slurries is taking place in waste dumps; here, useful areas are being occupied, and contamination of water bodies, which is associated with percolation of the galvanic slurries in water-bearing horizons, is occurring. There is essentially no effective technical solution to the problem of the deep dewatering of similar waste dumps. In the majority of establishments where mechanical-dewatering departments exist, installed equipment is too complex and unreliable. The most diverse systems are used throughout the world for these purposes: drum and disk vacuum filters, centrifuges, and chamber and belt filter presses. According to one of the manufacturers of filtration equipment - the German firm Eber-hard Hoesch (Alsdorf) - chamber filter presses are used in cleaning structures in 70% of cases in all countries.