氧化法除废水中锰的研究_冶金工程.rar

摘要:含锰废水，特别是锰厂生产过程中产生的含锰废水，其Mn2+的含量大大超过了国家规定的锰排放标准。随着电解锰行业的快速发展，电解锰生产设备以及污水处理系统的不完善，产生的大量含锰废水，引发了严重的环境问题以及水污染问题。因此，有必要对含锰废水进行处理。

　　　本论文对严重超标的含锰废水，为了达到保护环境的目的，对废水中的Mn2+采用氢氧化物沉淀-氧化法除去废水中的锰离子。采用氢氧化物沉淀-氧化法研究了各单因素条件对除锰效果的影响，得到的最佳工艺条件为：反应温度为50℃、H2O2（稀释5倍）用量为4mL、NaOH（2mol/L）用量为6mL、反应时间为50min。除锰率最高达99.99%，除锰后溶液中Mn2+浓度由2000ug/mL降至0.05ug/mL，符合国家《污水综合排放标准》(GB8978-1996)中对锰离子的一级标准限值(2mg/L)的排放要求。

关键词：含锰废水  硫酸锰  锰离子  双氧水  氧化法

ABSTRACT:Manganese wastewater, especially manganese plants generated during the production of electrolytic manganese wastewater. Which the content of divalent manganese ion content greatly exceeded the national emission standards. With the rapid development of manganese industry, Manganese production equipment as well as sewage treatment system is imperfect, produce a lot of waste water containing manganese, triggered a serious environmental problems as well as water pollution problem. In particular wastewater containing soluble manganese ions can make people with chronic poisoning and contaminated water.

　　　In this thesis, for the excessive wastewater containing manganese, In order to achieve the purpose of protecting the environment, the divalent manganese ions of wastewater using hydroxide precipitation - oxidation to remove the manganese ions of wastewater. Using hydroxide precipitation - oxidation examined the single factor conditions on the effect of removing manganese, the optimum conditions were: The reaction temperature was 50℃, the H2O2 dosage was 4mL, the NaOH dosage was 6mL, the reaction time was 50min. The manganese removal rates up to 99.99%. After the reaction, the concentration of divalent manganese ions in solution was reduced from 2000 ug/mL down to 0.05 ug/mL , line with national "Integrated Wastewater Discharge Standard" (GB8978-1996) in the standard limit (2mg / L) of the manganese ions emission requirements.

Keywords: Manganese wastewater; Manganese sulfate; Manganese ions; Hydrogen peroxide; Oxidation.