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摘要

1404537 Treating effluents DIRECTORGENERAL AGENCY OF INDUSTRIAL SCIENCE & TECHNOLOGY 21 Sept 1973 [26 Sept 1972 27 Oct 1972] 44385/73 Heading C1C [Also in Division C3] An abutment for removing heavy metal ions from industrial effluent comprises a granular mixture of nitrohumic acid with one or more high molecular weight binder which contain carboxyl groups, either as the free acid, or as water-insoluble salts thereof. 5 to 50 parts by weight of the binder are used for 100 parts by weight of the nitrohumic acid. Binders exemplified are carboxymethyl cellulose, alginic acid, polyacrylic acid and petroleum protein. In examples, PbSP++/SP, CdSP++/SP and HgSP++/SP ions are removed from solutions of salts at pH 6.