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Emissions Guidelines

Emissions levels for the design and operation of each project must be established through the en- vironmental assessment (EA) process on the basis of country legislation and the Pollution Prevention and Abatement Handbook, as applied to local con- ditions. The emissions levels selected must be justified in the EA and acceptable to the World Bank Group.

The guidelines given below present emissions levels normally acceptable to the World Bank Group in making decisions regarding provision of World Bank Group assistance. Any deviations from these levels must be described in the World Bank Group project documentation. The emissions levels given here can be consistently achieved by well designed, well operated, and well maintained pollution control systems.
The guidelines are expressed as concentrations to facilitate monitoring. Dilution of air emissions or effluents to achieve these guidelines is un- acceptable.
All of the maximum levels should be achieved for at least 95% of the time that the plant or unit is operating, to be calculated as a proportion of annual operating hours.

Air Emissions
Air emissions of particulate matter (PM) should be less than 20 mg/Nm3 where toxic metals are presentandlessthan50mg/Nm3 inothercases. This would correspond to total dust emissions of less than 1 kg/t of steel. Sulfur oxides should be less than 2,000 mg/Nm3 and nitrogen oxides, less than 750 mg/Nm3.

Liquid Effluents
For mini steel mills, the effluent levels presented in Table 1 should be achieved. Sludges from wastewater treatment and steel finishing operations should be disposed of in a secure landfill after chrome reduction and stabilization. Levels of heavy metals in the leachates should be less than those presented for liquid effluents. Solid wastes such as slag, dust, and scale should be sent for metals recovery or recycled to the extent feasible.

Ambient Noise
Noise abatement measures should achieve either the levels given below or a maximum increase in background levels of 3 decibels (measured on the A scale) [dB(A)]. Measurements are to be taken at noise receptors located outside the project property boundary.


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Products Management
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