Sample Wastewater Treatability Test Results

Case Study 1

Objective

Disinfect for fecal coliform to meet high level disinfection standards for reclaimed water systems while remaining within total trihalomethane (TTHM) regulatory standards at a Southwest Florida Wastewater Plant.

Results

Several effluent samples were collected from the plant's treatment system. A Ferrate dose of as little as 1-ppm was effective in disinfecting for fecal coliform (FC) to the high-level regulatory limit of <1 CFU/100 mL.

A 2-ppm dose was equally effective for all the samples tested. This was achieved with minimal or no TTHM formation. Samples were also collected on different days to evaluate total phosphorus (TP) removal using Ferrate. A dose of 1-ppm reduced TP by 77% to 0.14 mg/L in one sample. Slightly higher dosages were even more effective in reducing TP to below 0.1 mg/L.

Case Study 2

Objective

Disinfect plant effluent for fecal coliform (FC) to <14 CFU/100 mL, and reduce CDBM (Dibromochloromethane), caused by chlorination of plant effluent, to below 34 ug/L at an East Coast Florida Wastewater Plant.

Results

At a dose of 3-ppm, not only was Ferrate Treatment able to meet the disinfection target, it also reduced the CDBM concentration down to 1.39 ug/L.

Case Study 3

Objective

To reduce extremely high color and disinfect for Total Coliform (TC) without exceeding regulated disinfection byproduct (DBP) standards at a Tennessee Wastewater Treatment Plant.

This facility's high effluent color is due in large part, but not exclusively, to a single industrial contributor.

Results

Ferrate treatment at a dose of 15-ppm was able to reduce effluent color to 25 Platinum Cobalt Units (PtCoU), lower TC numbers to none detected (<1 CFU/100 mL), and to meet the DBP standards applicable to drinking water. Ferrate treatment at the same 15-ppm dose was still able to reduce effluent color to 25 PtCoU, even with this industrial source being contributed to the influent wastewater.

Case Study 4

Objective

Achieve high-level disinfection of effluent (<1 CFU/100 mL), and meet primary drinking water DBP standards (TTHM and HAA5) at a Florida Wastewater Plant.

Samples were collected and tested from two points in the existing treatment train.

Results

The sample from the secondary clarifier was disinfected to the high-level standard using only 3-ppm of Ferrate. The disinfection byproducts were 1.11 ug/L of TTHM and 12.84 ug/L of HAA5, well below primary drinking water standards. An effluent sample collected after filtration was disinfected to the same standard using only 1-ppm of Ferrate. Analyses for DBPs were conducted using the 3-ppm Ferrate treated jar. The DBPs were 4.40 ug/L for TTHM and 18.80 ug/L for HAA5, well below primary drinking water standards.