In this episode of The Water Online Show, hosts Travis Kennedy and Kevin Westerling dive into one of the most pressing issues in the water and wastewater industry: PFAS contamination. With the recent release of the U.S. EPA’s draft risk assessment on PFAS in biosolids, the conversation is more relevant than ever. To shed light on the findings, implications, and potential regulatory future, the hosts are joined by Rashi Gupta, National Wastewater Practice Director at Carollo Engineers. The discussion covers the widespread presence of PFAS, which affects over 90% of the U.S. population, and how these chemicals, long present in various sources, have only recently been detected in biosolids used in agriculture. The EPA’s draft risk assessment models the impact of PFAS on a hypothetical “farm family” consuming food, water, and animal products from contaminated land, revealing that even at low concentrations, the risk in some scenarios exceeds acceptable levels.

The episode also delves into the implications of potential regulatory changes, urging utilities and agricultural partners to prepare for new compliance requirements. While biosolids serve as cost-effective fertilizers with essential nutrients, concerns over PFAS contamination pose long-term environmental and health risks. The public has until March 17, 2025, to comment on the EPA’s draft, after which risk management strategies and regulations may follow. Utilities are advised to assess PFAS levels, manage industrial sources, and engage transparently with agricultural partners while considering diversification in biosolids management. As regulatory changes could bring financial burdens, stakeholders must balance costs with the overarching goal of public health and environmental protection. This episode highlights the complexity of PFAS contamination and the proactive measures needed to navigate the evolving landscape.

Tune in to The Water Online Show to hear all of Rashi Gupta’s expert advice.

In this episode of The Water Online Show, Joe Ball from Kamstrup returns for another discussion with host Travis Kennedy. Listen in to hear Travis and Joe's conversation about quality in the water industry, why it's not as easy to quantify, and Kamstrup's quality campaign launching in 2025.

This episode of The Water Online Show's In The Flow podcast addresses the persistent challenge of nutrient removal in wastewater treatment. Hosts Travis Kennedy and Kevin Westerling and guest Jose Jimenez, VP of Wastewater Treatment at Brown and Caldwell, discuss the ongoing impact of excess nutrients like nitrogen and phosphorus, which fuel harmful algal blooms and degrade water quality.

Jimenez highlights the need for municipalities to balance environmental protection with economic realities, finding solutions that address both nutrients and emerging contaminants. He explains that algal blooms are likely worsening due to increased nutrient pollution, climate change (warmer waters and increased rainfall), and other factors like urbanization.

The discussion covers regulatory nutrient limits and the technologies available for efficient removal. While biological nutrient removal (BNR) is common, newer methodologies like aerobic granular sludge (AGS), membrane aerated biofilm reactors (MABRs), and mobile organic biofilm (MOB) offer process intensification — maximizing treatment with fewer resources. Optimization, cost effectiveness, and nutrient recovery are key talking points as well.

Learn more by listening to the full interview.