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Monitoring & Reporting
Stack air emissions should be monitored continuously for PM, using an opacity meter (for an opacity level of less than 10%) or a dust detector.
Wastewater discharges should be monitored daily for the parameters listed in Table 1 except
For metals, which should be monitored at least weekly or whenever there are process changes. Monitoring data should be analyzed and re- viewed at regular intervals and compared with the operating standards so that any necessary corrective actions can be taken. A baseline data set should be developed for fugitive emissions, and periodic review (once every three years) of such emissions should be performed. Records of monitoring results should be kept in an accept- able format. The results should be reported to the responsible authorities and relevant parties, as required.
Key Issues
The key production and control practices that will lead to compliance with emissions guidelines can be summarized as follows :
  • Replace ingot teeming with continuous casting.
  • Locate EAFs in enclosed buildings or install dry dust collection systems such as bag filters.
  • Use countercurrent flow of rinse water in acid pickling.
  • Regenerate and reuse acid from spent pickle liquor or sell pickle liquor for use as a waste- water treatment reagent.
  • Recycle at least 90% of the wastewater.
  • Use hydrogen peroxide or urea to reduce nitrogen oxide emissions from nitric and hydrofluoric acid pickling baths.
Capabilities Overview
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