Improvement of wastewater treatment technology with sediment disposal at coke-chemical enterprises
Abstract
Wastewater generated at coke plants and harmful effects of pollutants on the environment are characterized. The main methods of sludge dewatering and prospects of the flotation method are listed. An experiment with industrial wastewater treatment from phenols, rhodanides, total ammonia and resinous substances with the natural mineral glauconite in combination with a 0.1% solution of cationic flocculant has been conducted at biochemical purification section of PJSC "YUZHKOKS", Kamyanske. The patented design of the flotator with partitions is recommended for implementation. The purification efficiency from phenols has been 35.7%, rhodanides – 32.1%, total ammonia – 57.2%, resins and oils – 95.0%. Laboratory studies have shown a prolonged effect of glauconite in combination with cationic flocculant with the addition of new portions of liquid waste up to 4 cycles in the removal of phenols and resinous substances. During the process, the MPC of phenols has been achieved before the stage of biological purification with the efficiency of extraction up to 50% and resinous substances – up to 95.37%. The mechanism of sewage treatment by glauconite in combination with cationic flocculant is offered. When disposing of sludge from a flotation plant, the possibility of using geotextile container technology to reduce the impact of high concentrations of pollutants in coke effluents has been established. As a result of researches the indicator of humidity of a deposit at dehydration of slime by means of technology of geotextile containers and reduction of its humidity from 92% to 50% is established. Physical and mechanical research has been carried out using glauconite sludge as an additive to the asphalt concrete mixture, physical and economic indicators of tests have been obtained in the laboratory of PE "Segment", Kamyanske. As a result of tests it has been found that the asphalt concrete mixture with the addition of glauconite sludge meets the requirements of DSTU BV 27–119: 2011 "Asphalt mixtures and road and airfield asphalt concrete. Technical conditions" and sludge disposal technology can be recommended for implementation at asphalt concrete plants in the manufacture of road surfaces
Keywords
coke chemical effluents; pollutants, glauconite; flocculant; flotation; sludg; geotextile containers; asphalt concrete mixture
References
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