Ron Hofmann
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View article: Integrated Coagulation–Disinfection Using Aluminium Polychloride and Sodium Hypochlorite for Secondary Wastewater Treatment: Operational Advantages and DBP Mitigation
Integrated Coagulation–Disinfection Using Aluminium Polychloride and Sodium Hypochlorite for Secondary Wastewater Treatment: Operational Advantages and DBP Mitigation Open
This study examines the potential for improved and more sustainable wastewater treatment by integrating coagulation and disinfection using polyaluminum chloride (PACl) and sodium hypochlorite (NaClO) for secondary effluent. The impacts of …
Performance Evaluation of In‐Duct Ultraviolet Germicidal Irradiation Air Disinfection Systems: The Role of Reduction Equivalent Dose Bias Open
The COVID‐19 pandemic highlighted the importance of effective air disinfection technologies to mitigate the spread of airborne pathogens. In‐duct ultraviolet germicidal irradiation (UVGI) systems may be a viable solution. System performanc…
Oxidation of Microcystis aeruginosa and Microcystins with Peracetic Acid Open
Peracetic acid (PAA) shows potential for use in drinking water treatment as an alternative to prechlorination, such as for mussel control and disinfection by-product precursor destruction, though its impact as a preoxidant during cyanobact…
Using total adenosine triphosphate (tATP) measurements for cyanobacterial bloom monitoring and response assessment during algaecide treatments Open
Total adenosine triphosphate (tATP) was investigated for its potential as a rapid indicator of cyanobacterial growth and algaecide effectiveness. tATP and other common bloom monitoring parameters were measured over the growth cycles of cya…
UV-chlorine advanced oxidation for potable water reuse: A review of the current state of the art and research needs Open
This paper reports conclusions from a recent study completed for the Water Research Foundation and the State of California to offer guidance on UV-chlorine advanced oxidation for potable water reuse. The fundamentals of UV-chlorine advance…
State of knowledge on early warning tools for cyanobacteria detection Open
The potential for cyanobacterial blooms to impact recreational and drinking water source quality is a growing concern. Numerous monitoring tools have been developed that can alert stakeholders to the onset of cyanobacterial blooms to initi…
Utility practices and perspectives on monitoring and source control of cyanobacterial blooms Open
Thirty‐five utilities across the United States (54%), Australia (26%), and Canada (20%) were surveyed to identify their experiences with early warning monitoring and source control of cyanobacteria. All utilities experience pelagic blooms,…
Modeling the efficiency of <span>UV</span> at 254 nm for disinfecting the different layers within <span>N95</span> respirators Open
The study presented a Monte Carlo simulation of light transport in eight commonly used filtered facepiece respirators (FFRs) to assess the efficacy of UV at 254 nm for the inactivation of SARS‐CoV‐2. The results showed different fluence ra…
Impact of temperature on chlorination strategies for mussel control at water treatment plants Open
Drinking water treatment plants in the Great Lakes often protect their intake structures against dreissenid biofouling by prechlorinating when water temperatures exceed 12 °C. This temperature threshold is based on the reproduction charact…
A comparison of sodium sulfite, ammonium chloride, and ascorbic acid for quenching chlorine prior to disinfection byproduct analysis Open
This study compared 3 commonly used quenching agents for dechlorinating samples prior to disinfection byproduct (DBP) analysis under typical drinking water sampling conditions for a representative suite of chlorination byproducts. Ascorbic…
Inside Cover Open
Access to sterile personal protective equipment, in particular for filtered face respirators is critical in the current pandemic for front line healthcare workers. Extended use may be required during supply shortages or due to economic con…
Light propagation within <span>N95</span> filtered face respirators: A simulation study for <span>UVC</span> decontamination Open
This study presents numerical simulations of UVC light propagation through seven different filtered face respirators (FFR) to determine their suitability for Ultraviolet germicidal inactivation (UVGI). UV propagation was modeled using the …
Machine Learning for Outlier Detection in Algal and Cyanobacterial Fluorescence Signals Open
Earth and Space Science Open Archive This work has been accepted for publication in Other. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. prep…
Light propagation within N95 Filtered Face Respirators: A simulation study for UVC decontamination Open
This study presents numerical simulations of UVC light propagation through seven different filtered face respirators (FFR) to determine their suitability for UV germicidal inactivation (UVGI). UV propagation was modelled using the FullMont…
Machine Learning for Outlier Detection in Algal and Cyanobacterial Fluorescence Signals Open
Excel files containing chlorophyll a and phycocyanin fluorescence data imported from https://www.glerl.noaa.gov/res/HABs_and_Hypoxia/habTracker.html for buoys WE2, WE4, WE8, and WE13. The Python code used to manipulate the data and generat…
Machine Learning for Anomaly Detection in Cyanobacterial Fluorescence Signals Open
Excel files containing chlorophyll a and phycocyanin fluorescence data imported from https://www.glerl.noaa.gov/res/HABs_and_Hypoxia/habTracker.html for buoys WE2, WE4, WE8, and WE13. The Python code used to manipulate the data is also inc…
Machine Learning for Anomaly Detection in Cyanobacterial Fluorescence Signals Open
Excel files containing chlorophyll a and phycocyanin fluorescence data imported from https://www.glerl.noaa.gov/res/HABs_and_Hypoxia/habTracker.html for buoys WE2, WE4, WE8, and WE13. The Python code used to manipulate the data is also inc…
Cyanotoxins and Cyanobacteria Cell Accumulations in Drinking Water Treatment Plants with a Low Risk of Bloom Formation at the Source Open
Toxic cyanobacteria have been shown to accumulate in drinking water treatment plants that are susceptible to algal blooms. However, the risk for plants that do not experience algal blooms, but that receive a low influx of cells, is not wel…
Data for: The Importance of a Photon-based Approach to Quantum Yield Determinations Open
Excel spreadsheet for calculating atrazine quantum yield
A comparative study of the hydroxyl radical scavenging capacity of activated sludge and membrane bioreactor wastewater effluents Open
This study evaluated the hydroxyl radical scavenging characteristics of wastewater from five membrane bioreactor (MBR) and five activated sludge (AS) systems. The average values of the characteristics of both wastewater types was found to …