Page 31 - Trihydro Sustainability Report

Use of real-time analysis and monitoring to increase efficiency

CENTRAL CALIFORNIA

Trihydro has designed, constructed, and is operating a groundwater treatment system in central California,
targeting the removal of 1,2,3-TCP and nitrate. The process controls include in-line continuous analyzers
to optimize the use of ion-exchange resin. The analyzers allow the system to treat a portion of the total
groundwater flow while ensuring that the effluent meets discharge limit requirements. This results in a lower
frequency of ion-exchange resin regeneration and therefore less waste.

Additional process monitoring, such as flowrates, pump speeds, and levels, allows the system to be operated
remotely, with limited site visits by an operator. Due to the remote nature of the site, this drastically reduces
the fuel consumption and allows personnel to be used be efficiently. The system is also monitored by
security cameras and motion detectors which provide intrusion alarms and increase the site security.

Retrofit of a resource-intensive remediation system that has reduced costs, mile-
age, and water use

NORTHEAST NEBRASKA

A groundwater plume containing chlorinated solvents exists beneath a former industrial facility in a
remote Nebraska area with no access to on-site water or electricity. A solar-powered groundwater
extraction system (GWES) had operated at the site since 2010 to mitigate groundwater impacts. Extracted
groundwater was transported 10 miles to the local water treatment plant: at least four 5,000-gallon
tankers hauled extracted water every day to a local wastewater treatment system.

In 2016, Trihydro retrofitted the existing solar-powered GWES system into an in-situ bioremediation
system. The system was configured to inject emulsified vegetable oil into eight wells simultaneously. In
addition to achieving larger reductions in chlorinated solvent concentrations than the GWES could achieve,
the system also boasts reduced costs and a reduced carbon footprint by eliminating the need for the water
tankers. Use of ISB has eliminated 7,500 miles of truck traffic and 4M gallon load to local wastewater
treatment works associated with GWES operations.

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