Open AccessTreatment of BOF gas cleaning systems sewage sediments by application of flocculants
Author(s) -
Н. С. Царев,
В. И. Аксенов,
И. И. Ничкова
Publication year - 2018
Publication title -
černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj i èkonomičeskoj informacii/černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj informacii
Language(s) - English
Resource type - Journals
eISSN - 2619-0753
pISSN - 0135-5910
DOI - 10.32339/0135-5910-2018-12-103-107
Subject(s) - dewatering , waste management , sediment , environmental science , flocculation , sewage , sewage sludge , sewage treatment , sedimentation , pulp and paper industry , environmental engineering , geology , geotechnical engineering , engineering , paleontology
Many steel-works discharge the sediments from BOF gas cleaning systems sludge pans into the waste accumulators without dewatering, therefore implementation of facilities of their treatment is an extraordinarily actual task. Besides the BOF gas cleaning systems sewage sediments are attributed to a substance rich or relatively rich by iron, which can be utilized in metallurgical production after dewatering. Application of synthetic organic flocculants for sediments conditioning is one of most effective methods of dewatering equipment operation intensification. Results of experiment tests on the treatment of real BOF gas cleaning systems sewage sediment by a high-molecular organic flocculants namely Servey FL9, Nalco 71661 and Nalco 8172 PULV. It was shown, that Nalco 8172 PULV is most effective reagent for the sediment conditioning. The effective doze of high-molecular anion flocculant for treatment of BOF gas cleaning systems sewage sediment before the gravitational thickening and further mechanical dewatering is 0.15 g of active substance per1 kg of dry sediment substance. Technological parameters of dewatering equipment determined when using high-molecular anion flocculant for intensification of the treatment process of BOF gas cleaning systems sewage sediment: the specific load for thickeners by dry sediment substance is 300–400 kg/(h·m 2 ), the specific load for disc vacuum-filter by dry sediment substance is 60–70 kg/(h·m 2 ). Content of suspended particles in bright water from thickeners and filtrate from vacuum-filter is less than 100 mg/dm 3 .