氧化镁湿法脱硫废液生物净化处理技术研究

发布时间：2018-05-26 09:29

本文选题：氧化镁湿法脱硫 + 脱硫废液　；参考：《大连海事大学》2015年硕士论文

【摘要】：氧化镁湿法烟气脱硫技术在国内经过十多年的研究和发展,其技术的可靠性、建造和运行的经济性以及可行性已获得了广泛认同。氧化镁湿法烟气脱硫工艺是一种使用氧化镁作为脱硫剂,吸收二氧化硫生成亚硫酸镁和少量硫酸镁浆液的湿法脱硫技术,其关键环节为脱硫过程中废水的排放以及其净化处理。镁基-海水法船舶烟气脱硫(Magnesium Base-seawater Marine Flue Gas Desulfurization, MS FGD)以镁法为脱硫主体,以海水法为辅助。废液中含有大量的氮氧化物、硫氧化物和重金属化合物等,具有盐浓度高、化学需氧量高以及可生化性差等特点。氨氮以及重金属化合物作为水体主要污染物应得到广泛重视,因而镁基-海水法船舶烟气脱硫废液中氨氮以及重金属去除方法研究具有重要意义。本文对MS FGD废液中氨氮、硝酸盐、亚硝酸盐、硫酸盐、亚硫酸盐、钙、镁离子、氯离子、化学需氧量、重金属、色度和浊度进行了分析测定；筛选高效脱氮菌株,利用同步硝化反硝化技术对MS FGD废液进行生物脱氮；考察单元处理方法对MS FGD废液中重金属去除效果,着重考察微生物絮凝剂对MS FGD废液中重金属去除效果,利用短小芽孢杆菌发酵合成γ-聚谷氨酸(poly-y-glutamic acid, y-PGA)作为重金属去除剂；对MS FGD废液进行综合处理。综合处理后MS FGD废液中NH3-N由最初的604.00 mg/L降低到12.00 mg/L；NO2--N由最初的16.09 mg/L降低到1.04 mg/L；NO3-N由最初的196.12 mg/L降低到0.32 mg/L；重金属Zn2+、Cr3+、V5+、Cd2+、Pb2+、Ni2+,分别由最初的0.26、0.34、8.28、0.87、2.54、101.67 mg/L降低到0.06、未检出、1.04、0.05、0.42、11.39mg/L。为适合于船舶燃油烟气氧化镁湿法脱硫废液生物净化处理研究提供技术方法。
[Abstract]:The magnesium oxide wet flue gas desulfurization technology has been studied and developed in China for more than ten years. The reliability of the technology, the economy of construction and operation and the feasibility have been widely recognized. Magnesium oxide wet flue gas desulfurization process is a wet desulphurization technology which uses magnesium oxide as desulfurizer to absorb sulfur dioxide to form magnesium sulfite and a small amount of magnesium sulfate slurry. The key link of this technology is the discharge of wastewater and its purification and treatment in the process of desulfurization. Magnesium Base-seawater Marine Flue Gas Desulfurization, MS FGD) with magnesium base-seawater method as the main body of desulfurization and sea water method as auxiliary. The waste liquid contains a large number of nitrogen oxides, sulfur oxides and heavy metal compounds, which has the characteristics of high salt concentration, high chemical oxygen demand and poor biodegradability. Ammonia nitrogen and heavy metal compounds should be paid more attention to as the main pollutants in water body, so it is of great significance to study the removal methods of ammonia nitrogen and heavy metals in the waste liquor of marine flue gas desulfurization by magnesium base and seawater method. Ammonia nitrogen, nitrate, nitrite, sulfate, sulfite, calcium, magnesium ion, chloride ion, chemical oxygen demand, heavy metal, chroma and turbidity in MS FGD waste liquor were analyzed and determined. Simultaneous nitrification and denitrification were used to remove nitrogen from MS FGD waste liquor, and the removal effect of heavy metals in MS FGD waste liquor by unit treatment was investigated, and the removal effect of microbial flocculant on heavy metal removal from MS FGD waste liquor was studied. 纬 -poly-glutamic acid (y-PGA) was synthesized by Bacillus pumilus fermentation as a heavy metal remover, and MS FGD waste liquor was treated synthetically. After comprehensive treatment, the NH3-N of MS FGD waste liquor decreased from 604.00 mg/L to 12.00 mg / L no 2--N from 16.09 mg/L to 1.04 mg / L no 3-N from 196.12 mg/L to 0.32 mg / L, and the heavy metal Zn2 Cr 3 / V 5 and CD 2 Pb 2 Ni 2 decreased from 0.26 mg / L 0.34 mg / L 8.280.87U 2.54101.67 mg/L to 0.06, respectively. This paper provides a technical method for biological purification of waste liquid from wet desulfurization of ship fuel gas with magnesium oxide.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X736.3

【参考文献】