Известия Томского политехнического университета: Инжиниринг георесурсов (Jun 2018)
Decrease of toxic properties of soda production sludge and its utilization
Abstract
The relevance of the study is caused by the need to develop the ways of decreasing toxic properties of soda production sludge and its utilization. The main aim is to study the possibility of reducing the environmentally hazardous properties of soda production sludge and subsequent disposal. The methods. To reduce the environmentally hazardous properties of soda production sludge the authors have proposed dewatering the source distilled liquid by sedimentation, filtration and centrifugation. Biotesting of water extracts was carried out on test objects of different systematic groups (Ceriodaphnia affinis, Daphnia magna Straus, Scenedesmus guadricauda and Paramecium caudatum). Physico-chemical properties of soda production sludge and distilled liquid were determined according to the established procedures. Phytotoxicity of the material for biological reclamation was studied by the seedlings method using oat and pea seeds. Physico-chemical properties, melting capacity and corrosion activity of the samples of liquid deicing materials was determined by «Method of testing anti+ icing materials». Physical and mechanical properties of soda production sludge were determined by the requirements of the State Standard R 52129-2003 «Mineral powder for asphalt and organomineral mixtures». For hot asphalt mix with soda production sludge the performance was determined in accordance with the requirements of the State Standard 9128-84 «A mixture of asphalt road, airfield and asphalt concrete. Technical conditions». The results of the research allowed the authors to determine that the soda production sludge has properties hazardous to the environment that can be removed by changing the way of dehydration. The fine fraction of sludge (
