Anoxic‐aerobic digestion of waste activated sludge: Part II‐supernatant characteristics, ORP monitoring results and overall rating system
- 1 April 1989
- journal article
- research article
- Published by Taylor & Francis in Environmental Technology Letters
- Vol. 10 (4) , 371-384
- https://doi.org/10.1080/09593338909384753
Abstract
This research demonstrated the feasibility of incorporating, at regular intervals, non‐aerated conditions in aerobic sludge digestion. This paper (Part II) details the benefits realized in terms of supernatant quality (NO∗ levels reduced by 2 orders of magnitude; PO4 levels reduced by one‐half to one‐third). Monitoring the oxidation‐reduction potential (ORP) revealed characteristic profiles where slope changes correlated well with the (dis)appearance of ammonia, nitrates and dissolved oxygen. An overall rating system was developed which suggested that anoxic‐aerobic sludge digestion out performed both lime‐control and conventional digestion modes.Keywords
This publication has 2 references indexed in Scilit:
- Oxidation-Reduction Potential – A Tool for Monitoring, Control and Optimization of Biological Nutrient Removal SystemsWater Science & Technology, 1985
- Comparison of Aerobic and Anoxic-Aerobic Digestion of Waste Activated SludgeWater Science & Technology, 1985