Low temperature desorption of the used activated carbons that contain VOCs (Volatile Organic Compounds) produced from Shiwha/Banwal industrial complex were investigated. Iodine number and BET specific surface area of the activated carbons manufactured by N company in China were measured to see their characteristics prior to use in the experiment. Activated carbons were used to adsorb VOCs in a company of Shiwha/Banwal complex. Used activated carbons were collected and desorbed by the desorbing facility. After 1st adsorption and 1st desorption samples were taken for analysis. Desorbed activated carbons were reused in the same company. After 2nd adsorption and 2nd desorption samples were taken again for analysis. 4 samples were analyzed by TGA (Thermogravimetric Analyzer) at 170℃ with a heating rate of 10℃/min. Also, activation energies and reaction orders of desorption reaction were assessed by employing Friedman method and Freeman-Carroll method. The activation energies were 16.86kJ/mol by Friedman method and reaction orders were 0.36∼5.16 by Freeman-Carroll method.

Desorption reaction characteristics of the used activated carbons collected from manufacture of rubber and plastics products in Shiwha/Banwal industrial complex were investigated. Desorption reactions were analyzed based on the data obtained from a thermogravimetric analyzer. Activation energies and reaction orders for desorption reaction characteristics of the used activated carbons were estimated by employing the Friedman method and the Freeman-Carroll method. It was found that the activation energies were 24.7∼41.3 kJ/㏖ in the Friedman method and 13.9∼24.4 kJ/㏖ in the Freeman-carroll method, and reaction orders were 0.3∼1.4.

A detachment of biofilm was investigated in an inverse fluidized bed biofilm reactor(IFBBR). The biofilm thickness, δ and the bioparticle density, ρ_pd were decreased by the increase of Reynolds number, Re and the decrease of biomass concentration, b_c. The correlations were expressed as δ=61.6+16.33b_c-0.04Re and p_pd=0.3+0.027b_c- 2.93x10 exp (-5)Re by multiple linear regression analysis method. Specific substrate removal rate, q was derived by F/M ratio and biofilm thickness as q=0,44+0.82F/M-5.1x10 exp (-4)δ. Specific biofilm detachment rate, b_ds, was influenced by F/M ratio and Reynolds number as b_ds=-0.26+0.26F/M+2.17x10 exp (-4)Re. Specific biofilm deachment rate in an IFBBR was higher than that in a FBBR(fluidized bed biofilm reactor) because of the friction between air bubble and the bioparticles.