关键词: 煤化工污水, 气化灰水, 分质处理, 软化澄清, 生化脱氮

Abstract: As the national environmental protection requirements for coal chemical companies are increasing gradually, treatment of coal chemical sewage in series is proposed for the first time in coal chemical projects combining with the design principles of“ cleaning and sewage separation, pollutions separation and properties classified treatment” in refining and chemical projects Aiming at the water quality characteristics of pulverized coal gasification ash-water with low carbon and high nitrogen, the treatment technology with softening and clarification-biological deep denitrification process as the core is adopted to achieve efficient removal of hardness, ammonia nitrogen, total nitrogen and other pollutants from the sewage and realize long-cycle stable operation through core parameters optimization and multi-stage process configuration. This provides strong guarantee for subsequent salt separation and zero discharge.

Key words: coal chemical sewage, gasification ash-water, properties classified treatment, softening and clarification, biochemical denitrification