【摘要】 锰氧化物的累积与再释放是导致给水管网黄水问题的一个重要原因。在管道中消毒剂浓度较低的区域，锰氧化细菌能将出厂水中的残余Mn（Ⅱ）氧化成颗粒态锰氧化物（MnOx），致使锰沉积在管道内壁。使用实际给水厂中未消毒的滤后水探究微生物作用主导下不同管材[不锈钢、混凝土、聚氯乙烯（PVC）、聚乙烯（PE）]表面锰的氧化沉积和释放特征。142 d的管片沉积实验表明，Mn（Ⅱ）的微生物氧化过程分为三个阶段，启动需约50 d，第51～120天开始加速，其后投加的Mn（Ⅱ）被完全氧化。不同材质管片表面锰氧化菌的种类相似且丰度无明显区别，但锰沉积物的量差异较大，混凝土管片表面积累的锰沉积物最多，为（160.84±28.02） mg/m~2(P<0.01)，不锈钢、PVC、PE管片表面锰沉积量分别为（46.82±12.04）、（47.08±12.88）、（49.80±5.38） mg/m~2。在水力扰动条件下，不同材质管片表面锰沉积物相对释放量排序为不锈钢>PE>PVC>混凝土。更多还原

【Abstract】 The accumulation and re-release of manganese oxides constitute an important cause of the yellow water issue in the water distribution network. In regions where the disinfectant concentration is low within the pipeline, manganese oxidizing bacteria can oxidize the residual Mn(Ⅱ) in the product water into particulate manganese oxide(MnOx), thereby causing manganese deposition on the inner wall of the pipeline. The characteristics of oxidation, deposition, and release of manganese on the surfaces of various pipe materials including stainless steel, concrete, polyvinyl chloride(PVC), and polyethylene(PE) under the influence of microorganisms were explored using undisinfected post-filtration water from an actual water treatment plant. The 142-day duct piece deposition experiment indicated that the microbial oxidation process of Mn(Ⅱ) was categorized into three stages. It took approximately 50 days to commence,and accelerated during the period from the 51st to the 120th day. Subsequently, the added Mn(Ⅱ) was completely oxidized. The species of manganese oxidizing bacteria on the surface of diverse duct pieces were analogous, and no conspicuous disparity was witnessed in their abundance. Nevertheless, the quantity of manganese deposits on the surface of concrete segments exhibited a marked dissimilarity. The manganese deposits on the surface of concrete segments were the highest, reaching(160.84±28.02) mg/m2(P<0.01), while those on the surface of stainless steel, PVC, and PE segments were(46.82±12.04) mg/m2,(47.08±12.88) mg/m~2, and(49.80±5.38) mg/m~2, respectively. Under hydraulic disturbance, the relative release amount of manganese deposits on the surface of different materials in descending order was stainless steel, PE, PVC and concrete.更多还原