井上下联合处理工艺处理矿井水过程中溶解性有机质变化特征

Variation characteristics of dissolved organic matter in underground mine water with combined water treatment process at surface and underground mine

井上下联合处理工艺处理矿井水过程中,利用三维荧光光谱分析了矿井水中溶解性有机质的组成和变化特征。结果表明:不同处理工艺段对矿井水中DOM去除效果存在较大差异,采空区处理对矿井水中TOC和UV254的去除率分别达到67.453%和65.396%,深度处理可完全去除大分子有机物和芳香族化合物。三维荧光光谱显示,矿井水中表征出3类DOM,酪氨酸类芳香族蛋白质、色氨酸类芳香族蛋白质、溶解性微生物代谢产物。经过采空区处理后,3类有机质荧光强度都有较大降低,下降率分别为50.1%,54.4%和47.2%;深度处理使酪氨酸类有机质荧光峰消失,色氨酸类和溶解性微生物代谢产物荧光强度下降了75%左右。矿井水、采空区出水、常规处理出水中DOM主要为生物来源;膜过滤出水中残留的DOM主要源于陆生植物和土壤有机质;总体上,矿井水处理过程中来自生物或水生细菌的新近自生源组分比例逐渐增加。

During the underground mine water treatment by water treatment process at united surface and underground mine,3DEEM （three-dimensional excitation emission matrix fluorescence spectroscopy） was used to investigate the composition and variation characteristics of dissolved organic matter （DOM）. The results indicate that each process section has different removal effect for DOM. The removal rates of TOC and UV：54 are 67. 453% and 65. 396% respectively by mine goaf. Conventional water treatment processes makes the concentration of DOM increase slightly. Membrane treatment processes removes macromolecular organic compounds and aromatic compounds completely. There are three types DOM in 3DEEM, including tyrosine, tryptophan and soluble microbial byproducts. Mine goals can make the fluorescence intensities （Fls） of three types DOM reduce 50.1% ,54.4% and 47.2% respectively. Advanced processes make the FI of tyrosine disappear, and the FIs of tryptophan and soluble microbial byproducts reduces about 75%. DOM is a biological source in underground mine water, mine goal effluent and conventional water treatment processes effluent. DOM is from terrestrial plants and soil organic matters in membrane treatment process effluent. In a word, the ratio of newly formed DOM increases gradually in the treatment of underground mine water.