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首页> 外文期刊>International Biodeterioration & Biodegradation >Influence of water hardness on concrete surface deterioration caused by nitrifying biofilms in wastewater treatment plants
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Influence of water hardness on concrete surface deterioration caused by nitrifying biofilms in wastewater treatment plants

机译：水硬度对废水处理厂中生物膜硝化引起混凝土表面劣化的影响

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In aeration tanks of wastewater treatment plants (WWTP), biodeterioration can lead to a partial dissolution and ensuing erosion of the concrete due to an acid attack caused by the nitrifying biofilm covering the tank surface. In this study, concrete samples were exposed in four different WWTP. The CaO content of the cement used, the water-to-cement ratio, and curing affect the resistance of the concrete to acid attack. However, both experimental data and thermodynamic modeling show that water hardness is the dominating parameter for surface erosion. In the presence of high water hardness, the protons produced by the nitrifiers are buffered and the calcite precipitation occurring in all concrete samples is increased. This results in a decrease of porosity near the surface and higher mass transfer resistance against carbon dioxide and therefore in lower deterioration rates of the concrete
机译：在废水处理厂（WWTP）的曝气池中，由于覆盖池表面的硝化生物膜引起的酸侵蚀，生物降解会导致部分溶解并导致混凝土的侵蚀。在这项研究中，混凝土样品暴露在四个不同的污水处理厂中。所用水泥的CaO含量，水灰比和固化都会影响混凝土的耐酸侵蚀性。然而，实验数据和热力学模型均表明水硬度是表面侵蚀的主要参数。在高水硬度的情况下，硝化器产生的质子得到缓冲，所有混凝土样品中发生的方解石沉淀增加。这样可减少表面附近的孔隙率，并提高抗二氧化碳的传质能力，因此降低混凝土的劣化率

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