UTILIZATION OF CALCINED SORBENT FROM ASH-AND-SLAG WASTE FROM THERMAL POWER ENGINEERING PLANTS FOR WASTEWATER TREATMENT

IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY
 G. KOROTKOVA T,  M. ZAKOLYUKINA A,  I. DEMIN V
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Abstract

The discharge of untreated or insufficiently treated sewage into water bodies leads to their pollution, contributing to the emergence and spread of viruses and bacteria that have a negative impact on the ecosystem. One of the indicators of water contamination by pathogenic microorganisms is ammonium ions. The sorption method based on industrial waste as sorbent precursors has become widespread for treating wastewater from ammonium ions. The article presents the results of studies of a calcined sorbent based on ash-and-slag wastes from thermal power engineering plants for the treatment of real wastewater, discharged into the Kuban river within the city of Krasnodar, to remove ammonium ions (NH4+ concentration 21 mg/dm3). The effect of sorption time (10, 30, 60, 90, 150, and 180 min) and sorbent dose (0.5, 1, 2, 3, and 5 g) on treatment efficiency is investigated. The experimental data are processed on the basis of kinetic equations. It is shown that the equation of the pseudo-first-order (Lagergren) provides the best description of experimental data on sorption in comparison with the pseudo-second-order equation (Ho and McKay) and the Elovich equation. It has been established that internal diffusion adsorption is the limiting stage. Treatment efficiency was 72.8 % at a sorbent dose of 5 g for solution volume 50 cm3 and sorption time 180 min. It is shown that the sorbent dose affects the time within which the phase equilibrium between the solution and calcined sorbent is established. The larger is sorbent dose, the larger number of adsorption centres are occupied by ammonium ions per unit time, so, for the fixed ammonium ion concentration in initial solution, shorter sorption time will be necessary to achieve equilibrium. For real wastewater, the time necessary for equilibrium to be achieved exceeds the value determined experimentally with the model mixtures using small sorbent doses. Reasonability of the application of calcined sorbent for treatment of real wastewater is confirmed.
利用火力发电厂灰渣废料中的煅烧吸附剂处理废水
未经处理或处理不当的污水排入水体会造成水体污染,导致病毒和细菌的出现和传播,对生态系统产生负面影响。铵离子是病原微生物污染水体的指标之一。以工业废料为吸附剂前体的吸附法已广泛用于处理废水中的铵离子。文章介绍了以火力发电厂灰渣废料为基础的煅烧吸附剂处理克拉斯诺达尔市库班河实际废水以去除铵离子(NH4+ 浓度为 21 mg/dm3)的研究结果。研究了吸附时间(10、30、60、90、150 和 180 分钟)和吸附剂剂量(0.5、1、2、3 和 5 克)对处理效率的影响。实验数据根据动力学方程进行处理。结果表明,与伪二阶方程(Ho 和 McKay)和埃洛维奇方程相比,伪一阶方程(Lagergren)能最好地描述吸附实验数据。已确定内部扩散吸附是限制阶段。在溶液体积为 50 立方厘米、吸附时间为 180 分钟、吸附剂剂量为 5 克时,处理效率为 72.8%。研究表明,吸附剂剂量会影响溶液与煅烧吸附剂之间建立相平衡的时间。吸附剂剂量越大,单位时间内铵离子占据的吸附中心数量就越多,因此,在初始溶液中铵离子浓度固定的情况下,达到平衡所需的吸附时间就越短。对于实际废水,达到平衡所需的时间超过了使用小剂量吸附剂的模型混合物的实验值。应用煅烧吸附剂处理实际废水的合理性得到了证实。
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来源期刊
Chemistry for Sustainable Development
Chemistry for Sustainable Development CHEMISTRY, MULTIDISCIPLINARY-
自引率
25.00%
发文量
52
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