A correlation was developed to estimate the adsorption equilibrium capacity of various adsorbents and organic compounds using a combination of Polanyi potential theory and linear solvation energy relationships (LSERs). Polanyi theory provided the basic mathematical form for the correlation. LSERs were used to normalize the Polanyi theory based on the fundamental interaction forces between the solvent, adsorbate, and adsorbent expected in aqueous-phase adsorption. The correlation was developed using 56 organic compounds and eight adsorbents. The following classes of organic compounds were used:  (i) halogenated aliphatics, (ii) aromatics and halogenated aromatics, (iii) polyfunctional organic compounds and (iv) sulfonated aromatics. The adsorbents were (i) three coal-based activated carbons (F-300, F-400, and APA), (ii) one coconut shell based activated carbon (580-26), (iii) one unspecified activated carbon, and (iv) three synthetic polymeric adsorbents (XAD-4, XAD-7, and XEN-563). The proposed correlation, which considers the fundamental solvent−adsorbate−adsorbent interaction forces, showed a significant improvement in predicting the adsorption capacity over a correlation that considered only van der Waals forces. However, the correlations did not predict the adsorption capacities of highly soluble organic compounds such as polysulfonated aromatics and polyfunctional organic compounds.

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The objective of this study is to explore the potential of producing energy from open-dump solidwaste from Rajamangala University of Technology Isan Surin Campus. Heating value as well as thephysical and chemical compositions were analyzed. The composition and heating value were comparedto refuse-derived fuel quality standard. All waste samples were separated into combustible and non-com-bustible matter. Paper, plastic, food residue, textiles, rubber and leather were classified as combustible. In excess of ninety-nine (99%) of open dump waste consisted of combustible matteras follows: mixed plastic (45%), textile (19%), food residue (18%), paper (14%), and leather and rubber (3%). Non-combustible composted inert material consisted of only 1% of the open-dump solid waste. Moisture and total solid contents of open-dump solid waste were 51.6% and 48.4% (wet basis) respectively. Volatile matterand ash contents of those were 95.14% and 4.37% (dry basis) respectively. The heating value of the open-dump solid waste was 29 MJ kg-1, which is higher than the refusederived fuel quality standard and re-sults reported in earlier studies [8,10,14]. This indicated the potential of open-dump solid waste to produce refuse-derived fuel (RDF). Therefore, it is possible that energyrecovery through RDF production can be an effective waste management option for Rajamangala University of Technology Isan,Surin Campus. Further study should focus on production of RDF in terms of moisture content removal and compositions of RDF. Furthermore, characteristics of RDF should be determined to explore alter-native sources of renewable energy.