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Although developments in wastewater treatment over recent decades have focused on the biological reactor, the secondary settling tank (SST) also plays a major role in achieving increasingly stringent effluent quality standards.
This report collates many of the significant developments that have taken place in SST theory, design, modelling and operation. Earlier SSTs were designed only by empirical hydraulic criteria such as overflow rate, which do not recognize sludge concentration and settleability. Today, there are available not only much improved design procedures but also hydrodynamic models for simulating water and solids distribution and flows in full-scale SSTs.
Nine chapters cover a wide range of subjects including:
Reprinted for 2006
Scientific and Technical Report No.6
Mechanism and Design of Sequencing Batch Reactors for Nutrient Removal
The sequencing batch reactor (SBR) is perhaps the most promising and viable of the proposed activated sludge modifications today for the removal of organic carbon and nutrients. In a relatively...
Wetland Technology: Practical information on the design and application of treatment wetlands
Water quality standards across the world are being re-written to promote healthier ecosystems, ensure safe potable water sources, increased biodiversity, and enhanced ecological functions....
Sampling for Measurement of Odours
Research into the sampling and measurement of odours has developed in a number of sectors, especially the agriculture, food and process industries, with knowledge from each sector being...
Microbial Community Analysis
Microbial Community Analysis surveys the vast amount of theoretical and practical knowledge on the design of biological treatment systems. It describes the different types of biological wastewater...
Use of Novel Techniques to Quantify Phenotypes in Biological Treatment Process
This research attempts to evaluate nitrification treatment performance in combined carbon/nitrogen municipal wastewater reactors using traditional physical/chemical methods and modern molecular...
Towards a Renewable Future: Assessing Resource Recovery as a Viable Treatment Alternative: State of the Science and Market Assessment
Implementation of extractive resource recovery technologies at water resource recovery facilities (WRRFs) has been limited to date (2015). This research sought to facilitate a more widespread...
Characterizing Mechanisms of Simultaneous Biological Nutrient Removal During Wastewater Treatment
Simultaneous biological nutrient removal (SBNR) is the removal of nitrogen and/or phosphorus in excess of that required for biomass synthesis in biological wastewater treatment systems where there...
Milestones in Water Reuse
Milestones in Water Reuse: The Best Success Stories illustrates the benefits of water reuse in integrated water resources management and its role for water cycle management, climate...