连续产碱系统处理酸性矿山废水的方法构建与稳定性研究

发布时间：2018-03-18 08:33

  本文选题：酸性矿山废水　切入点：改性碳酸盐岩　出处：《贵州大学》2015年硕士论文　论文类型：学位论文

【摘要】：煤矿开采过程使区域内地下水变成酸性矿山废水,进而污染地表水并破坏生态环境。为提高AMD处理效果,对比现有AMD主动与被动法,对碳酸盐岩进行煅烧改性,确定最佳煅烧条件;总结现有生物与非生物处理技术的优缺点及适用条件,构建连续产碱系统(SAPS),将改性碳酸盐岩应用于其中考察其适用性,调节进水参数考察系统工艺条件,根据运行情况改进系统,构建具有较好耐受性和稳定性的连续产碱成套处理系统,得到以下几点结论:(1)碳酸盐岩在750℃时开始分解,煅烧2.0 h后,仍保持较强颗粒强度。摇瓶实验中,750℃煅烧改性碳酸盐岩在反应15.0h后能将AMD中Fe2+、Mn2+、Cu2+、Ni2+、Cd2+去除99%以上,克服了普通碳酸盐岩对Mn去除不佳的缺点。(2)在SAPS中,煅烧后的碳酸盐岩系统对AMD处理能力仅略高于原岩系统。提升进水C/S=2.0、HRT=48h后出水水质提升,但系统瞬时出水Fe浓度逐渐升高,不受HRT控制。pH=2.0时,污泥中微生物受到严重抑制。在SAPS厌氧环境中,pH提升受抑制,瞬时出水中各离子去除率不高。(3)于SAPS后增设沉淀池与中和池,增加进水铁和硫酸根负荷,系统能保持稳定出水效果;在中和池中生长出的微生物群与废水进一步反应,整个系统最终出水pH8.0,硫酸根与各金属离子均达100%去除,提出AMD逐步净化的酸性煤矿废水野外成套处理技术。(4)用PHREEQC模拟与实际结合推测金属离子去除机理,Fe可形成针铁矿和赤铁矿,Cu、Cd的主要形成金属硫化物和吸附作用去除,Ni在pH8才能以氢氧化物形式完全沉淀;当废水中基本不含其它离子,Mn才能进行反应被去除。
[Abstract]:In the process of coal mining, groundwater in the area is changed into acid mine wastewater, which pollutes the surface water and destroys the ecological environment. In order to improve the treatment effect of AMD, the carbonates are calcined and modified by comparing the existing AMD active and passive methods. The optimum calcination conditions were determined, the advantages and disadvantages of the existing biological and abiotic treatment techniques and their applicable conditions were summarized, and the continuous alkali-producing system was constructed. The modified carbonate rock was applied to the system to investigate its applicability, and the technological conditions of the system were adjusted. According to the improved system of operation, a complete set of continuous alkali-producing treatment system with good tolerance and stability was constructed. The following conclusions were drawn: 1) Carbonate rock began to decompose at 750 鈩，

本文编号：1628821