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Guidelines for Air Emission Regulation 10. Recommended limit values for emissions and inspection rules for thermal and catalytic oxidation installations for the destruction of organic solvents10.1 IntroductionThis chapter deals with thermal and catalytic oxidation installations used for destruction of organic solvents containing carbon, oxygen and hydrogen. Where other elements such as halogens and nitrogen are involved, please refer to the rules in chapter 3. 10.2 Operating conditionsDestruction of organic compounds should not commence before the installation reaches its optimal operating conditions (e.g. temperatures at the set points). 10.3 Limit values for emissions10.3.1 Limit value for emissions of TOC (Total Organic Carbon gases)The limit value for emissions of TOC is set at 1 % by weight of the expected maximum concentration in g TOC/normal m3 added to the installation (averaged over 1 hour), but normally up to a maximum of 100 mg TOC/normal m3 and down to a minimum of 20 mg TOC/normal m3. Reference condition is the actual concentration of oxygen. 10.3.2 Limit value for emissions of CO100 mg/normal m3 at actual concentration of oxygen. 10.3.3 Limit value for odoursAt first, the limit value for emissions of odours can be set at 4,000 LE/normal m3 at the actual concentration of oxygen. However, in some cases, for technical or financial reasons, it may be necessary to set a high limit value. (In such cases more than 95 % purification or abatement should be required.) 10.3.4 Limit value for emissions of NOX200 mg/normal m3 calculated as NO2 at actual concentration of oxygen. 10.4 Calculation of the height of outletsThe source strength which has the greatest dispersion coefficient found in sections 10.4.1 – 10.4.5, should be used to calculate the height of stacks and other outlets, see chapter 4. 10.4.1 Unburned specific organic compoundsSource strength is equal to the unburned part of the specific organic compounds measured or calculated after purification or abatement. 10.4.2 TOC (Total Organic Carbon gases)As a basis, calculations of dispersion coefficients should use a C-value of 0.1 mg TOC/m3. This C-value should take into account the fact that unknown, harmful substances such as aldehydes are formed during combustion. However, at effective combustion plants, most of the substances emitted will be light hydrocarbons such as methane, ethane, and propane. If it is possible to confirm that most of the TOCs emitted comprise these light hydrocarbons, the C-value can be increased to 1 mg/m3 10.4.3 COThe source strength for CO is calculated on the basis of the limit value for emissions of CO. 10.4.4 NOXThe source strength for NOX is calculated on the basis of the limit value for emissions of NOX. 10.4.5 OdoursThe source strength for odours is calculated as described in section 4.5. 10.5 Monitoring 10.5.1 AMSRefer also to section 5.2.4. 10.5.2 Performance measurementsPerformance measurements for TOC should be carried out with a flame ionisation detector (FID).
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