Phosphate Removal from Secondary Effluents Using Coal Gangue Loaded with Zirconium Oxide

Abstract

Phosphorus from secondary effluents and coal gangue from coal mining have caused serious environmental problems. The feasibility of phosphate removal from secondary effluents using calcinated coal gangue loaded with zirconium oxide (CCG-Zr) was explored. Major influencing factors like the calcinated temperature, CCG-Zr ratio, adsorbent dose, time and solution pH, etc. were investigated. Newly developed CCG-Zr accomplished a significantly higher phosphate removal for phosphate (93%) compared with CCG (35%) at a calcinated temperature of 600 °C and CCG-Zr mass ratio of 1:1. For CCG-Zr the maximum phosphate removal rate (93%) was noted at an initial phosphate concentration of 2 mg/L within 20 min. The CCG-Zr displayed a higher phosphate removal rate (85–98%) over a wide range of solution pH (2.5~8.5). The adsorption isotherms fitted better to the Freundlich (R2 = 0.975) than the Langmuir model (R2 = 0.967). The maximum phosphate adsorption capacity of the CCG-Zr was 8.55 mg/g. These results suggested that the CCG-Zr could potentially be applied for the phosphate removal from secondary effluents.

Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

“…Phosphate, a molecule consisting of the elements phosphorus (P) and oxygen [ 1 ], is an essential macronutrient for all life [ 2 ]. With nitrogen and carbon, phosphorus is the primary source of productivity and is fundamental for freshwater ecosystems’ sustainability [ 3 ].…”

Fiber-Reinforced Coal Gangue-Based Alumina Aerogel Composites with Highly Thermal Stability by Ambient Pressure Drying

“…Therefore, using coal gangue as a resource is of great importance with regards to environmental protection, the utilization of waste resources and the sustainable development of society. At present, the utilization of CG in China is not high; the treatment of CG is mainly focused on basic applications, such as the production of building materials and extraction of chemical products, and agricultural applications [6][7][8][9][10][11]. Realizing the resource utilization of solid waste CG is an important direction for comprehensive technical utilization of CG [7][8][9].…”

“…At present, the utilization of CG in China is not high; the treatment of CG is mainly focused on basic applications, such as the production of building materials and extraction of chemical products, and agricultural applications [6][7][8][9][10][11]. Realizing the resource utilization of solid waste CG is an important direction for comprehensive technical utilization of CG [7][8][9]. In addition to achieving green development in the coal industry, efficient coal gangue treatment and utilization can also result in the recycling of secondary resources.…”

Study on adsorption of phosphate from aqueous solution by zirconium modified coal gasification coarse slag

“…9 However, most Zr-based adsorption materials are sourced from biochar, 10 activated carbon, 8 synthetic zeolite, 11 natural minerals, 12 and other carriers. 13,14 In terms of modification research, Zr-modified materials have very high raw material and production costs, and the preparation processes are complicated, requiring high temperatures, large amounts of chemical reagents. Therefore, there is a pressing need to find cheap and easily available carrier materials for the production of adsorbents with simpler, more environmentally friendly, and more energy-efficient preparation processes.…”