Hazardous waste

Replacement of sodium bicarbonate in an industrial waste vitrification plant

Project definition:

The client is a devitrification unit for asbestos waste. Under the emission standards for the incineration of Industrial Waste (at an adjusted value of 10 mg/Nm3 of HCl and 50 mg/Nm3 of SO2), the site is equipped with a dry flue gas treatment system, with a sodium bicarbonate injection at 180°C between an electrostatic precipitator and a bag filter.

 

In this context, the operator is faced with a number of challenges in the running of the plant, given the operating conditions (the variability of temperature, output and concentration of pollutants) relative to the specific mixing process and the heterogeneity of the treated waste.

 

Aside from the inability to treat the most sulphurous waste, this amounts to a daily challenge of cutting peaks (up to 8000 mg/Nm3 of SO2 upstream)- despite the overconsumption of reagents and additional maintenance.



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