Orlov Alexander, Belkanova Marina, Vatin Nikolay
Institute of Architecture and Construction, Russian Federation, South Ural State University, 454080 Chelyabinsk, Russia.
Higher School of Industrial, Civil and Road Construction, Russian Federation, Peter the Great St. Petersburg Polytechnic University, 195251 Petersburg, Russia.
Materials (Basel). 2020 Nov 23;13(22):5293. doi: 10.3390/ma13225293.
Water treatment plant (WTP) sludge is actively used in building materials production. The object of this research was modifying additives for ceramic bricks from WTP aluminium-containing sludge. The research aim of this study was to determine the suitability of a million-plus population city's WTP sludge as a burning-out additive in the production of structural ceramics and to establish the optimal conditions for obtaining products with the best characteristics. The raw water belongs to water belongs to the hydrocarbonate class, the calcium group, and it is of low turbidity (1.5-40 mg/L kaolin). Sludge, sourced from WTP sedimentation tanks, was dewatered by adding lime or by using the freezing-thawing method. The spray-dried WTP sludge is introduced into the clay in amounts of 5% to 20% by weight. The addition of 20% reduces the sensitivity of the clay to drying, reduces the density of ceramic by 20% and simultaneously increases its compressive strength from 7.0 to 10.2 MPa. The use of WTP sludge as a modifying additive, pretreated by the freezing-thawing method, makes it possible to obtain ceramic bricks with improved properties. The results can be used for WTP sludge containing aluminium obtained by treating water of medium turbidity and medium colour.
水处理厂（WTP）污泥正积极应用于建筑材料生产。本研究的对象是用于由WTP含铝污泥制成的陶瓷砖的改性添加剂。本研究的目的是确定一个人口超百万城市的WTP污泥作为结构陶瓷生产中烧尽添加剂的适用性，并确定获得具有最佳特性产品的最佳条件。原水属于碳酸盐类、钙组水，浊度较低（1.5 - 40 mg/L高岭土）。从WTP沉淀池获取的污泥通过添加石灰或采用冻融法进行脱水处理。喷雾干燥的WTP污泥按重量计以5%至20%的量引入到粘土中。添加20%可降低粘土对干燥的敏感性，使陶瓷密度降低20%，同时将其抗压强度从7.0 MPa提高到10.2 MPa。使用经冻融法预处理的WTP污泥作为改性添加剂，能够获得性能更优的陶瓷砖。这些结果可用于处理中等浊度和中等颜色水所得到的含铝WTP污泥。
