Biological filtration (biofiltration) is the operational practice of managing, maintaining, and promoting biological activity on granular media in a high-rate, gravity filter to enhance the removal of organic and inorganic constituents before introducing treated water into the distribution system.
Publications are listed in order of Publication Date with most recently published on top.
A prior assessment estimating the national compliance costs associated with perchlorate (Russell et al. 2009) was updated to account for utility actions taken in response to state regulations for perchlorate in California and Massachusetts. The updated cost assessment reinforces concern that the potential impacts of establishing a federal maximum contaminant level for perchlorate on individual systems are significant, particularly for small water systems.
A Comparative Evaluation of Community Structure in Full-Scale Digesters Indicates that Two-Phase Digesters Exhibit Greater Microbial Diversity than Single-Phase Digesters
Two-phase (acid-gas) anaerobic digestion can improve process performance relative to conventional, mesophilic, single-phase anaerobic digestion. However, few studies have considered the impact of phase separation on microbial community structure. We compared six full-scale, two-phase digestion (TPD) facilities and four conventional digestion (CD) facilities at municipal wastewater treatment plants by collecting performance data and evaluating microbial community structure via Illumina 16S rRNA gene sequencing.
This paper reviews sulfite in the environment, sulfite chemistry, microbiology, toxicity, and its potential use for denitrification.
Our review of the literature, as well as our own lab experience, suggests that sulfite can effectively serve as an electron donor for denitrification. Further research is needed to determine the kinetics of sulfite-based denitrification, its toxic threshold for sulfur-oxidizing microorganisms, and its potential inhibition of sensitive species such as nitrifying microorganisms and potential formation of nitrous oxide.
Water engineers and utilities are often faced with a decision concerning the best type of pump when designing a high-service pump station for delivery of potable water to the distribution system. For this application, the two most common types of pumps are horizontal split case (HSC) pumps and vertical turbine (VT) pumps.
The water quality success of the direct potable reuse project in Big Spring is measured by a nearly three-year long study that has spanned the majority of the facility's operating history to date. Study sampling for a wide range of CECs indicates that concentrations in the influent to the advanced treatment train are already below health-based benchmarks defined by a national panel of experts, and concentrations in the product water, where detected, are even lower. This article is focused on the results of pathogen sampling and the implications of those results.
Settling Regimen Transitions Quantify Solid Separation Limitations Through correlation with Floc Size and Shape
This study monitored three different activated sludge systems from the Blue Plains Advanced Wastewater Plant for a 1 year period to explore the relationship between effluent quality and activated sludge settling and flocculation behavior.