AMS

The City of Paso Robles, California, used an online THM analyzer capable of low-level real-time detection of DBCM and BDCM to help characterize and monitor THMs in its treated wastewater for groundwater recharge use. The high frequency of reliable and accurate THM data provided by the THM-100™ proved essential to the City’s DBP strategy to maintain regulatory compliance with NPDES permit levels.

The City of Paso Robles, California, used an online water quality instrument to characterize and monitor low levels of bromodichloromethane (BDCM) and dibromochloromethane (DBCM) in its treated wastewater for groundwater recharge (GWR) use. The high frequency of reliable and accurate THM data provided by the online instrument proved essential to the City’s disinfection by-product (DBP) strategy to obtain regulatory compliance with NPDES permit levels.

Aigües de Barcelona has systematically addressed the complexities of managing DBPs in its extensive distribution network by adopting AMS’ DaaS technology to monitor its water quality, provide process control and ensure regulatory compliance analysis. The introduction of THM-100™, an online THM and THM Formation Potential analyzer with > 98.5% data availability and uptime, and subsequent process optimizations have led to significant achievements. THM levels at the treatment plants saw an 86% decrease, with a parallel 53% reduction throughout the distribution network. These improvements have also translated into a substantial economic benefit, saving the utility an estimated 30,000€ monthly in operational costs, minimizing energy costs and reducing carbon emissions.

To reduce dependence on imported bulk chemicals, minimize carbon footprint and ensure final effluent discharges are within regulatory limits, wastewater treatment facilities can benefit from the SafeGuard™ H2O phosphate removal system. The novel technology, manufactured by AMS, generates a ferrous/ferric reagent in-situ via an electrolytic process, providing a sustainable and effective approach to phosphate removal. SafeGuard™ H2O has been proven in multiple bench-scale demonstrations to have repeated success removing phosphate.

To help manage disinfection by-products (DBPs), the City of Santa Cruz Water Department (SCWD) used an online THM analyzer to obtain real-time and reliable data on THM and THM Formation Potential levels within the Graham Hill Water Treatment Plant and distribution network. The THM-100 online analyzer aided the SCWD in daily operations and management of feasibility studies to reduce distribution system THM levels.

A SafeGuard™ H2O demonstration system with a capacity of 3 gpm (150 mL/minute) was installed onsite for testing at the City of Banning’s Facility Well C2 from June-September 2022. The scope of this demonstration focused on the safe, reliable reduction of Cr6 to Cr3 using SafeGuard™ H2O electrogenerated stannous reagent.  The demonstration validated the effectiveness of the SafeGuard™ H2O technology to treat Cr6 and Cr(T) below 10 ppb, granting it conditional acceptance from the California SWRCB Division of Drinking Water for use of the technology by public drinking water systems to treat Cr6 contamination.

A recent demonstration at the City of Banning, California, validated the effectiveness of the AMS SafeGuard™ H2O technology to treat Cr6 and Cr(T) below 10 ppb, granting it conditional acceptance from the California SWRCB Division of Drinking Water for use of the technology by public drinking water systems to treat Cr6 contamination. SafeGuard™ H2O generates a non-toxic stannous reagent on demand via an electrolytic process, offering utilities of all sizes an affordable, effective and sustainable Cr6 remediation solution.

Concerned with its reliance on bulk chemicals to meet the current or future arsenic MCL, the City of Alamosa evaluated the SafeGuard™ H2O arsenic removal treatment system to replace the use of bulk ferric chloride. The bench-scale test characterized the efficacy of the technology and the coagulation filtration requirements. The demonstration was initiated to show the ability of SafeGuard™ H2O to provide effective and reliable arsenic removal below the MCL, evaluate the purity of the in-situ generated ferrous reagent compared to bulk ferric chloride, and study the impact of both reagents on UF membrane health.

The SafeGuard™ H2O arsenic removal treatment system has been evaluated by the City of Alamosa to replace the use of bulk ferric chloride. The evaluation was completed via bench-scale testing and subsequent pilot demonstration; showing the electrogenerated ferrous reagent to achieve reliable arsenic removal below 5 ppb with a ferrous dose of 6.5-8 mg/L. The validation of SafeGuard™ H2O technology to generate a ferrous reagent in-situ via an electrolytic process shows great promise for utilities looking to remove arsenic to low levels and eliminate reliance on hazardous bulk chemicals.

The Athens Water Supply & Sewerage Company S.A. (EYDAP) installed the online THM-100™ analyzer to the drinking water reservoir outlet of the Galatsi Water Treatment Plant for a three-month evaluation period, providing EYDAP with continuous online analysis of THM values. The real-time THM data helped EYDAP to understand how the total THM (TTHM) concentration and THM speciation composition are affected by changes in raw source water quality and chlorine contact time. With the help of the reliable data provided by the THM-100, EYDAP was able to better mitigate the presence of harmful THMs across the service area.