钒钨钛脱硝催化剂再生过程废水脱砷研究
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摘要
对碱浸脱砷反应后的废水进行脱砷研究。考察工艺流程、添加剂种类及用量、反应体系pH值、反应温度,反应时间对脱砷效果的影响。确定最佳工艺参数:氧化剂H2O2用量H2O2:As=5 (化学计量比)、氧化温度T=30℃、氧化时间15 min;采用铁盐(浓度为4. 4 g/L)控制溶液p H=11;沉淀剂CaO用量Ca/(As+V+W)=5∶1 (化学计量比)、沉淀温度T=85℃、沉淀时间30 min。此法对废水进行脱砷处理后As含量最低可达0. 45 mg/L,达到国家排放标准,脱砷废液可循环利用,脱砷残渣为直接堆置的无害残渣。
The catalyst and arsenic-bearing waste water is generated through alkaline leaching and arsenic removal reaction which reacted by arsenic-bearing catalyst and sodium hydroxide solution,direct discharge of arsenic-bearing waste water will pollute the environment. The arsenic removal from the waste water after alkaline leaching and arsenic removal reaction is mainly studied. The investigation is mainly carried out for process flow,addition agent type and dosage,the pH value of reaction system,the effect of reaction temperature,reaction time on arsenic removal results. The best process parameters are confirmed: the dosage of oxidizing agent H2 O2,H2 O2: As = 5( stoichiometric proportion),oxidizing temperature T = 30℃,oxidizing time is 15 min; iron salt( concentration is 4. 4 g/L) is adopted to control pH value of solution,p H = 11; the dosage of the precipitating agent CaO is Ca/( As + V + W) = 5 ∶ 1( stoichiometric proportion),the precipitation temperature T = 85℃,the precipitation time is 30 min. The waste water is treated by the above mentioned arsenic removal method,then the lowest As content can reach to 0. 45 mg/L,which can meet the national discharge standard,the arsenic removed waste liquor can be recycled,the arsenic removed residues can be directly stacked as the harmless residue.
The catalyst and arsenic-bearing waste water is generated through alkaline leaching and arsenic removal reaction which reacted by arsenic-bearing catalyst and sodium hydroxide solution,direct discharge of arsenic-bearing waste water will pollute the environment. The arsenic removal from the waste water after alkaline leaching and arsenic removal reaction is mainly studied. The investigation is mainly carried out for process flow,addition agent type and dosage,the pH value of reaction system,the effect of reaction temperature,reaction time on arsenic removal results. The best process parameters are confirmed: the dosage of oxidizing agent H2 O2,H2 O2: As = 5( stoichiometric proportion),oxidizing temperature T = 30℃,oxidizing time is 15 min; iron salt( concentration is 4. 4 g/L) is adopted to control pH value of solution,p H = 11; the dosage of the precipitating agent CaO is Ca/( As + V + W) = 5 ∶ 1( stoichiometric proportion),the precipitation temperature T = 85℃,the precipitation time is 30 min. The waste water is treated by the above mentioned arsenic removal method,then the lowest As content can reach to 0. 45 mg/L,which can meet the national discharge standard,the arsenic removed waste liquor can be recycled,the arsenic removed residues can be directly stacked as the harmless residue.
引文
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[14]张昭,彭少芳.废水中除砷的热力学分析及应用[J].成都科技大学学报,1995,27(3):36-41.
[15]钟耀东,强颖怀,赵新兵.重金属砷的前期处理试验[J].江苏环境科技,2007,20(5):6-9.
[2]朱云.从含砷钼矿浸出液中脱砷[J].中国钼业. 2008,3(5):22-24.
[3]普旭力,王鸿辉,董清木,等.纳米氧化铝对砷(Ⅲ)和砷(V)的吸附行为研究[J].广东微量元素科学,2008,15(7):50-54.
[4] Thoma R. Holm and Steve D. Wilson. Chemical oxidation for arsenic removal. Midwest Technology Assistance Center Publication[J]. TR06-05 ISWS Conteact Report 2006,1-17.
[5] Ganesh Ghuiye and Dennis Clifford. Laboratory study on the oxidation of arsenicⅢto arsenic V. 2001(EPA/600/R-01/021):1-87.
[6] Twidwell L. G.,Plessas K. O.,Comba P. G. ET AL,Removal of arsenic from wastewaters and stabilization of arsenic bearing waste solids:Summary of experimental studies, 1994, 36(1):69-80.
[7] Palfy P.,Vircikova E.,MOLNAR l. Processing of arsenic waste by precipitation and solidification. Waste Management,1999,19(1):55-59.
[8]聂静.有色金属冶炼生产中含砷废水和废渣的治理研究[D].武汉:武汉理工大学.
[9]白锰,刘万宇,郑雅杰,等.冶炼厂含砷废水的硫化沉淀与碱浸.铜业工程,2007(2):33-36.
[10] Thoma R. Holm and Steve D. Wilson. Chemical oxidation for arsenic removal[J]. Midwest Technology Assistance Center Publication TR06-05.
[11] Veronique Lenoble. As(V)retention and As(Ⅲ)simultaneous oxidation and removal on a Mn O2-loaded polystyrene resin[J].Science of the Totle Environment,2004(326):197-207.
[12] Nishimura T,Tozawa K. The Reaction for the Removal fo As(Ⅲ)and As(V)from Aqueous Solutions by adding Calcium Hydroxide[J]. J. Min. Me. t Inst. Japan,1984(100):1085-1091.
[13]刘辉利,朱义年. CO2对砷酸钙稳定性影响的热力学分析[J].环境保护科学,2006,32(3):7-10.
[14]张昭,彭少芳.废水中除砷的热力学分析及应用[J].成都科技大学学报,1995,27(3):36-41.
[15]钟耀东,强颖怀,赵新兵.重金属砷的前期处理试验[J].江苏环境科技,2007,20(5):6-9.