Effect of Coal Combustion Products in Reducing Soluble Phosphorus in Soil II: Leaching Study

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• 作者：Balaji Seshadri (1) (2)
  Nanthi S. Bolan (1) (2)
  Anitha Kunhikrishnan (3)
  Girish Choppala (4)
  Ravi Naidu (1) (2)
  
• 关键词：Phosphorus ; Coal combustion products ; Leaching ; Soil pH ; Calcium concentration
• 刊名：Water, Air, and Soil Pollution
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：225
• 期：1
• 全文大小：
• 作者单位：Balaji Seshadri (1) (2)
  Nanthi S. Bolan (1) (2)
  Anitha Kunhikrishnan (3)
  Girish Choppala (4)
  Ravi Naidu (1) (2)
  
  1. Centre for Environmental Risk Assessment and Remediation, Building-X, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
  2. Cooperative Research Centre for Contamination Assessment and Remediation of the Environment, PO Box 486, Salisbury, South Australia, 5106, Australia
  3. Chemical Safety Division, Department of Agro-Food Safety, National Academy of Agricultural Science, Suwon-si, Gyeonggi-do, 441-707, Republic of Korea
  4. Centre for Plant and Water Science, Central Queensland University, Rockhampton, Queensland, 4702, Australia
  
• ISSN：1573-2932

文摘

Phosphorus (P) management in agriculture is crucial for both environmental health and future availability of P resource. Application of P as fertilisers (organic or inorganic) often results in either P accumulation in soil or loss to water bodies, rendering them unavailable to crops. In this study, the mobility of inorganic (KH2PO4 (PP)) and organic (poultry manure (PM)) P sources, as affected by coal combustion products (CCPs: fly ash (FA) and fluidised bed combustion ash (FBC)) application to soils, was evaluated using column leaching experiments. The incubated samples were also characterised using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to understand their surface properties in relation to P adsorption and leaching. The results showed differential effects of CCPs to P treatmentsn the case of PP, the CCPs decreased P leaching by 12.11% (FA) and 20.56% (FBC), whereas in the case of PM treatment, both CCPs increased P in leachates by 35.53% (FA) and 18.44% (FBC). The decrease in P leaching for PP-treated soil as affected by CCPs was attributed to high pH and Ca concentration. There was a negative relationship between the increase in CCP-induced pH and P leaching demonstrating that pH plays a crucial role in P immobilisation, transformation and leaching. The increase in P leaching for CCP-incubatedM-treated soils was because of the mineralisation of organic P from PM. The surface chemistry from XRD and SEM results showed an increased surface area for CCPs-incubated soil compared to the control and also showed the presence of Ca-rich minerals in CCPs such as ettringite, wollastonite and merwinite.