Showing papers in "Environmental engineering in 1987"

Wastewater Technology Innovation for the Year 2000

Abstract: The present state of wastewater technology research is on a decline because of shrinking funds. A national effort by professionals in all sectors of the wastewater establishment is encouraged to renew the research process. Suggestions on how to begin this include expanding research opportunities and developing research partnerships, developing new mechanisms for joint risk taking to encourage innovation, and establishing a foundation to support basic research and foster the complete research cycle.

Biological Treatability of In-Situ Coal Gasification Wastewater

Abstract: Wastewater from an underground coal‐gasification (UCG) pilot facility is degraded aerobically in laboratory chemostats for a period of seven months. Pretreatment includes only dilution and phosphorous addition. The experimental design includes solids retention times from 10 to 30 days and dilution rates of 25% and 50%. Aerobic biological treatment provides removal of 83–91% COD, 82–90% TOC, and 56–87% ammonia. The results extend the range of UCG wastewater strength to be effectively treated by biological processes. Air stripping is not a significant mechanism for carbon removal, but is estimated to have removed from 0% to 68% of the ammonia, depending upon operating conditions. The suitability of attached growth systems for treatment of this wastewater is indicated by: (1) Solids settling properties that would require very long clarification times in a full‐scale, activated sludge system; and (2) the enhanced COD‐removal filamentous organisms in one reactor.