【作者】 黄晓鸣；

【导师】 陈天虎；

【作者基本信息】 合肥工业大学 ， 环境工程， 2009， 硕士

【摘要】 针对焦化废水含有高浓度挥发酚和氨氮,难以生化处理的特性,本文提出以锰矿石氧化、磷酸铵镁（鸟粪石）沉淀两步处理焦化废水的方法。以磷酸、硫酸调节焦化废水pH-至酸性,利用锰矿石在酸性条件下的氧化性,氧化去除废水中的挥发酚及其他还原性污染物,降低废水的COD_cr浓度。再向锰矿石氧化后的焦化废水投加菱苦土粉,搅拌反应进行磷酸铵镁沉淀实验,去除和回收废水中的氨氮及所加的磷酸。调节10L焦化废水pH至1.2,酸化后废水经锰矿石氧化,挥发酚浓度去除率达99%,COD_cr去除率达70%;向处理后废水投加菱苦土使固液比为18g/L,搅拌反应24h,氨氮以磷酸铵镁沉淀的形式得到去除和回收,去除率达90.1%,pH升高至9.4。X射线衍射（XRD）和透射电镜（TEM）对沉淀产物表征分析表明,磷酸钱镁沉淀是在菱苦土颗粒表面形成并生长的。通过锰矿石对几种取代酚氧化的静态实验,发现锰矿石对几种对位取代酚氧化效果的顺序为:4-氯酚>4-甲酚>4-硝基酚。当苯环对位取代基为供电基时,取代酚不稳定性增大,更易被锰矿石氧化;当苯环对位取代基为吸电基时,取代酚稳定性增大,难以被锰矿石氧化。更多还原

【Abstract】 To treat the coking wastewater which contains high concentrations of volatile phenols, ammonia-nitrogen, a two step method of manganese ore oxidation and magnesium ammonium phosphate （struvite） precipitation was proposed in this study. Firstly, the pH value was adjusted to acidity using phosphoric acid and sulphuric acid, volatile phenols and other reducing contaminations in the coking wastewater were removed by manganese oxides accoding to its strong oxidation in acidic condition. And the concentration of COD_Cr was decreased. Secondly, the magnesia was added to the above coking wastewater treated by manganese ore to perform the precipitation experiment, then ammonia-nitrogen and phosphate will be removed and recovered.Adjusted pH value of 10L coking wastewater to 1.2, then acidic wastewater was oxidized by manganese ore. The removal efficiencies of volatile phenols and COD_Cr were 99% and 70%; then magnesia was added to the above coking wastewater treated by manganese ore, ammonia-nitrogen was removed and recovered in the form of magnesium ammonium phosphate at a solid-liquid ratio of 18 g/L after 24 hours stirring. The removal efficiency of ammonia-nitrogen was 90.1% and pH value of wastewater increased to 9.4. The characterization of the crystallized product by X-ray diffraction （XRD） and transmission electron microscope （TEM） indicated that the struvite formed and grew on the surface of the magnesia particles.Through the static experiment on oxidation of 3 substituted phenols by manganese ore, substituted phenols reduced in the following order: 4-chlorophenol > 4-methylphenol > 4-nitrophenol. When para substituents on the benzene ring is electron-donating groups, substituted phenols are oxidized by manganese ore more easily according to the instability of substituted phenols increased. When para substituents is electron withdrawing group, substituted phenols are difficult to oxidize by manganese ore according to the stability of substituted phenols increased.更多还原