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.

In Shiwha/Banwal industrial complex, activated carbons are widely used to remove VOCs. General method of regenerating activated carbons is proceeded at high temperature (800℃). But it causes loss of activated carbons and high cost. In this study, activated carbons were treated at a low temperature of 170℃ to avoid these. Desorption reactions were analyzed based on the data obtained from a thermogravimetric analyzer. THC(Total Hydro Carbon) analyzer was used to analyze desorption reaction of activated carbons.

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.

Desorption characteristics of waste activated carbons collected from chemicals manufacturing industries in Shiwha/Banwal industrial complex were investigated. Activated carbons were decomposed in a thermogravimetric analyzer (TGA) at 513K with heating rate of 10 ℃/min under nitrogen atmosphere. Activation energies and reaction orders for desorption, from the waste activated carbon were estimated by employing Friedman method and Freeman-Carroll method. It was found that the reaction orders of desorption in waste activated carbons were 0.27-1.69, and activation energies were 15.2-45.7 kJ/mol in Friedman method and 13.7-17.1 kJ/mol in Freeman-Carroll method.

The VOCs discharge characteristics of miscellaneous assembly metal manufacture & metal processing industries, in the SihwaㆍBanwol Industrial Complex, were analyzed according to detailed categories per industry, as based on the Korea Standard Industrial Classification, by comparing the conditions before and after the installation of process and prevention facilities. The average concentration of benzene was highest in the metal heat treatment industry (28921) whereas that of toluene was highest in the painting & membrane treatment industry (28923). In addition, with respect to prevention facilities, our evaluation proved that the decreased efficiency was worse for the discharge facilities of pollutants from the plating industry (28922) and painting & miscellaneous membrane treatment industry (28923), with some exceptions, while most facilities showed no decreased efficiency. Therefore, it is believed that an accurate survey of the conditions of administration/operation facilities will need to be conducted, and the decreased efficiency will also need to be evaluated so that adequate prevention facilities can be reviewed and selected.

The objectives of this investigation are as follows: 1) To sort out places of businesses that have to do with the discharge of offensive odor 2) To find out what generates offensive odor 3) To check the current status regarding offensive odor. The investigation is held through complete enumeration of approximately two thousand businesses concerning the SihwaㆍBanwol Industrial Complex. The local residents have directly visited related businesses and performed the following investigations: 1) General status check 2) Area source 3) Point source The investigation of offensive odor is utilized by direct olfactory method in six levels. Through this method, the followings have been established as DB: Degree of offensive odor, type of odor, preventive facility status, etc. The major characteristic of this investigation is that local residents have directly visited individual businesses and checked the status of offensive odor, which opens up a possibility of mutual settlement for the reduction of offensive odor between businesses and local residents. Businesses and local residents can share a common understanding and this means a great deal. Furthermore, it is widely expected that the investigation data can be utilized as a source for presuming the origin of offensive odor in case of civil petition.