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Assessing wastewater toxicity to activated sludge: recent research and developments
1Gradient Corporation, 20 University Road, Cambridge, MA 02138, USA. sren@gradientcorp.com
Environment International
|September 1, 2004
Summary
Monitoring sewage influent toxicity is crucial to prevent disruptions in biological treatment systems. Recent toxicity assessment methods, while advanced, still do not fully meet established criteria for effective wastewater treatment monitoring.
Area of Science:
- Environmental Science
- Environmental Engineering
- Microbiology
Background:
- Municipal sewage treatment plant (STP) influent wastewater can contain toxicants that inhibit activated sludge biological activity, leading to process upsets.
- Effective influent wastewater toxicity monitoring is essential to prevent treatment plant process disruptions.
- A 2000 Water Environment Research Foundation (WERF) report reviewed existing toxicity assessment methods and set criteria for monitoring.
Purpose of the Study:
- To review recent research and developments in methods for assessing wastewater toxicity to activated sludge.
- To compare new and improved toxicity assessment methods against the criteria established in the 2000 WERF report.
- To evaluate whether recent research has addressed the criteria and research needs outlined in the WERF report.
Main Methods:
- Comprehensive literature review of recent research on wastewater toxicity assessment methods for activated sludge.
- Analysis of advancements in assays and devices developed since the 2000 WERF report.
- Comparison of identified methods against the WERF report's criteria for influent wastewater toxicity monitoring.
Main Results:
- Bioluminescence- and respirometry-based methods have received significant attention in recent research for toxicity assessment.
- None of the newly developed or improved toxicity assessment methods fully meet all the criteria specified in the 2000 WERF report.
- Research efforts since 2000 have not consistently incorporated the WERF criteria or addressed the proposed research needs.
Conclusions:
- Despite advancements, current wastewater toxicity assessment methods require further development to meet established monitoring criteria.
- Future research should prioritize addressing the criteria and research needs identified in the 2000 WERF report for effective influent toxicity monitoring.
- Improved toxicity monitoring is vital for maintaining the stability and efficiency of biological wastewater treatment processes.