Water Treatment

Using the rule revisions five-sample approach to identify schools with increased lead

an interesting paper on an “approach to classify a school’s lead risk, which could help water utilities and schools prioritizing testing and remediation efforts,” recently appeared in the journal ‘Environmental Science & Technology Letters’.

Tenets of a Holistic Approach to Drinking Water-Associated Pathogen Research, Management, and Communication

A holistic approach will (i) target multiple microorganisms simultaneously, (ii) involve experts across several disciplines, and (iii) communicate results across disciplines and more broadly, proactively addressing source water-to-customer system management.

Guidance For Providing Safe Drinking Water in Areas of Federal Jurisdiction

This document is intended to provide technical guidance to assist federal departments meet their legislative obligations. It takes into consideration the unique circumstances faced by many departments in order to best protect human health

Drinking Water Quality Guidelines across Canadian: Jurisdictional Variation in the Context of Decentralized Water Governance

review identifies key differences in the regulatory approaches to drinking water quality across Canada’s 13 jurisdictions. Only 16 of the 94 CDWQG are consistently applied across all 13 jurisdictions; five jurisdictions use voluntary guidelines, whereas eight use mandatory standards.

A pilot study on the feasibility of testing residential tap water: Implications for environmental justice and health

The article offers a very different perspective, using citizen scientists and addressing implications for environmental justice and health.

Removal of phytotoxins in filter sand used for drinking water treatment

researchers from Denmark are studying phytotoxins – those produced by plants – from the potential of them being contaminants with the potential to impair drinking water quality. Of several different phytotoxins spiked into groundwater and ultimately treated by 5 different filter types, two of them, jacobine N-oxide and senecionine N-oxide, were found to be non-biodegradable. They were also able to identify some degradation products.

Drinking Water DBPs & Congenital Malformations

The study examined 623,468 births and concluded that “TTHM exposure was associated with the increased risk of malformations of the nervous system, urinary system, genitals, and limbs in areas exclusively using chloramine. An association between chloramine-related chlorination by-products and congenital malformations has not previously been highlighted and needs further attention.”

Quantifying Nanoparticle Associated Ti, Ce, Au, and Pd Occurrence in 35 U.S. Surface Waters

It provides baseline concentrations and sizes for typical occurrence of natural and anthropogenic (manufactured) nanoparticles (NPs) including gold, cerium, titanium, and palladium (Au, Ce, Ti, and Pd) in US drinking water sources.

Sensitivity of Bacteria, Protozoa, Viruses, and Other Microorganisms to Ultraviolet Radiation

An article published in the Journal of Research of the National Institute of Standards and Technology provides five tables of recommended fluences (dosages) for 1 to 5 log reduction of spores, bacteria, protozoa, viruses, and algae and other large microorganisms.

Decay of infectious SARS-CoV-2 and surrogates in aquatic environments

A recently published study found that persistence of viable SARS-CoV-2 was temperature dependent, remaining infectious for significantly longer periods of time in freshwater at 4°C than at 20°C. This is consistent with other viruses. The T90 for infectious SARS-CoV-2 in river water was 2.3 days and 3.8 days at 20°C and 4°C, respectively, but the viral RNA was much more stable (remained detectable for the 20 day duration of the experiment).