FIELD: waste water treatment. SUBSTANCE: neutralization of waste waters originated from mechanical engineering and metalworking industry, where acidic iron- containing waste waters are to be detoxified, is separated into two consecutive steps: first to pH 6-7 by filtration at depression 0.4-0.6 kg/sq. cm through thin (0.5-2.0 mm) bed of fine neutralization reagent (ferrochrome slag) for 1 min and then, to pH 8.5-9.5, using line-milk neutralization. EFFECT: reduced loading on waste disposal plants and accelerated sedimentation in settlers. 4 dwg, 1 tbl, 2 ex
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