Optimization of Suspended Solids Removal from Coal-Ash Laden Wastewaters.

摘要

Wastewater resulting from the drawing down of ash from coal-fired boilers contains a significantly high concentration of suspended solids requiring treatment prior to release into sanitation lines for treatment at municipal wastewater treatment plants. As an example, the steam plant at the Naval Amphibious Base Little Creek in Norfolk, Virginia is experiencing high surcharges from the Hampton Roads Sanitation District (HRSD) for the high concentration of suspended solids in their wastewater. At present, there are no mechanisms in place to pre-treat this wastewater prior to its discharge into HRSD. The purpose of this project is to analyze the effectiveness of various coagulant aids in the removal of suspended solids from the ash-laden wastewater. In addition, the effectiveness of an anionic polymer in response to changes in pH, velocity gradients of flocculation, and various top/bottom ash water mixtures was analyzed.