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首页> 外文期刊>Advances in materials science and engineering >Incineration of Textile Sludge for Partial Replacement of Cement in Concrete Production: A Case of Ethiopian Textile Industries
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Incineration of Textile Sludge for Partial Replacement of Cement in Concrete Production: A Case of Ethiopian Textile Industries

机译：混凝土生产中水泥部分替代纺织污泥的焚烧 - 以埃塞俄比亚纺织工业为例

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The rapid growth of textile industries in Ethiopia plays an important role in economic development. However, the sludge from these wastewater treatment plants, which is not an integral part of the treatment process, is often considered hazardous as it is contaminated with heavy metals of dyestuffs and chemicals. The customary transfer routines such as landfilling and incineration may not be suitable because the leachate from the landfilling destinations and the buildups from the incinerators lead to optional contamination. Moreover, such transfer choices are not financially practical. Therefore, there is a growing need to look for various applications of sludge handling for sustainable development. This study attempts to find out an environmentally friendly solution for the management of the textile sludge by incinerating the sludge and using it for partial replacement of cement in concrete production. Concrete is a composite material formed by the combination of cement, sand, coarse aggregate, and water in a particular proportion so that concrete produced meets the needs regarding its workability, strength, durability, and economy. Typical textile sludge was having high heavy metal contents as per the United States Environmental Protection Agency (USEPA) guideline and should be properly disposed of. The sludge upon incineration at 625°C for four hours gives 78.1% moisture content, 61.2% volatile organic matter, and 59.6% inorganic ash content. The main reactive oxide elements such as SiO 2 , Fe 2 O 3 , CaO, and Al 2 O 3 were found to be 18.51, 3.19, 23.87, and 12.73% by weight in the ash. The calorific value determined from the dried sludge were found to be 1973?cal/gm. Concrete block was manufactured by replacement of cement with 10, 20, 30, 40, and 50% incinerated textile sludge ash, and the manufactured block was evaluated in terms of their compressive strengths, leaching behavior, and water absorption. The replacement cement by the ash increases the hydration time reduced, and up to 20%, sludge ash incorporation in the concrete mix design gives the designed compressive strength. Eventhough water absorption increases with increasing content of the incorporation of the ash, for the 20% replacement of cement, the lethal concentration of heavy metals was obtained to be below the permissible limit set by USEPA. Consequently, the experiment work indicates that the potential use of textile sludge ash for cement concrete gives the possibilities of reduction of heavy metal contamination to surroundings upon sludge disposal, reduces the use of raw materials for producing cement and reduces environmental pollution during cement production.
机译：埃塞俄比亚纺织业的快速增长在经济发展中发挥着重要作用。然而，来自这些废水处理厂的污泥，这不是治疗过程的组成部分，通常被认为是危险的，因为它被染料重金属和化学品的重金属污染。垃圾填埋和焚烧等常规转移惯例可能不适合，因为从填埋目的地的渗滤液和来自焚化炉的堆积导致可选的污染。此外，这种转移选择在经济上没有实用。因此，越来越需要寻找污泥处理可持续发展的各种应用。本研究试图通过焚烧污泥并使用它在混凝土生产中替代水泥的部分替代水泥来了解对纺织污泥进行环境友好的解决方案。混凝土是通过水泥，砂，粗骨料和水中的组合形成的复合材料，使得产生的混凝土符合其可加工性，强度，耐用性和经济性的需求。典型的纺织污泥根据美国环境保护局（USEPA）指南，典型的纺织污泥具有高重金属含量，并应妥善处理。在625℃下焚烧的污泥4小时，含有78.1％的水分含量，61.2％挥发性有机物，和59.6％的无机灰分含量。在灰分中，发现诸如SiO 2，Fe 2 O 3，CaO和Al 2 O 3的主要反应性氧化物元素如SiO 2，Fe 2 O 3，CaO和Al 2 O 3在灰分中重量为12.51％。从干燥的污泥确定的热值被发现是1973年的CAL / GM。通过用10,20,30,40和50％焚烧纺织污泥灰更换水泥制造混凝土块，并在其抗压强度，浸出行为和吸水率方面进行制造的块。灰烬的替代水泥增加了水合时间降低，污泥灰在混凝土混合设计中的污泥灰份掺入，给出了设计的抗压强度。对于灰分掺入的含量增加，对灰分掺入的含量增加，对于20％的替代水泥，得到重质金属的致死浓度低于使用PA的允许极限。因此，实验工作表明，纺织污泥灰水泥混凝土的潜在用途赋予污泥处理对周围环境的重金属污染的可能性，减少了生产水泥生产水泥的使用，减少水泥生产过程中的环境污染。

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