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→Recent Performance Research
==Recent Performance Research==
==Recent Performance Research==
[[File:OGS types Lee, 2014 update.PNG|thumb|400px|Shown here are the two variations of hydrodynamic separators ([[Oil and grit separator]]s) used in the 6-year study conducted by Lee, et al., 2014. All four OGS' used were of different sizes. The first (Type A) was a dip cylindrical plate with a centershaft and the second (Type B) was a hollow cylindrical screen. All four sites where the OGS' were installed were in urban settings in Gyunggi Province, Korea, and discharge into Gyung-An stream, which deposits into the Pal-dang Lake. This lake is the the primary drinking water source for Seoul's Metropolitan area (Lee, et al. 2014<ref>Lee, D.H., Min, K.S. and Kang, J.H., 2014. Performance evaluation and a sizing method for hydrodynamic separators treating urban stormwater runoff. Water science and technology, 69(10), pp.2122-2131)</ref>]].
[[File:OGS types Lee, 2014 update.PNG|thumb|400px|Shown here are the two variations of hydrodynamic separators ([[Oil and grit separator]]s) used in the 6-year study conducted by Lee, et al., 2014. All four OGS' used were of different sizes. The first (Type A) was a dip cylindrical plate with a centershaft and the second (Type B) was a hollow cylindrical screen. All four sites where the OGS' were installed were in urban settings in Gyunggi Province, Korea, and discharge into Gyung-An stream, which deposits into the Pal-dang Lake. This lake is the the primary drinking water source for Seoul's Metropolitan area (Lee, et al. 2014<ref>Lee, D.H., Min, K.S. and Kang, J.H., 2014. Performance evaluation and a sizing method for hydrodynamic separators treating urban stormwater runoff. Water science and technology, 69(10), pp.2122-2131)</ref>.]]
*[https://www.conteches.com/Portals/0/Documents/Product%20Evaluation%20and%20%20Testing/vx_harding_township.pdf?ver=2018-05-31-143332-863 (Greenway, 2001) - Stormwater Treatment Demonstration Project - Oil water/grit separator followed by a sand filter.]
*[https://www.conteches.com/Portals/0/Documents/Product%20Evaluation%20and%20%20Testing/vx_harding_township.pdf?ver=2018-05-31-143332-863 (Greenway, 2001) - Stormwater Treatment Demonstration Project - Oil water/grit separator followed by a sand filter.]
**This project took place for Harding Township in New Jersey back in 2001. The performance assessment showcased the ability of a Vortechnics Oil/Grit separator followed by a sand filter's removal ability over three years located at a rest stop off a nearby highway. A full storm analysis was conducted over the three-year project and found that the average TSS (mg/L) entering the Oil/Grit separator was 492 mg/L whereas the outlet of the separator had only 35.18 mg/L of TSS remaining (a ~93% reduction rate). Once water passed through the sand filter after the OGS, the removal efficiency increased to 98.12%, with only 9.28 mg/L of TSS remaining (Greenway, 2001<ref>Greenway, R.A. 2001. Stormwater Treatment Demonstration Project—Oil water/grit separator followed by a sand filter: RTP Environmental Associates. Inc., prepared for Harding Township, NJ, Environmental Commission and the New Jersey Department of Environmental Protection, Paper WM-668. https://www.conteches.com/Portals/0/Documents/Product%20Evaluation%20and%20%20Testing/vx_harding_township.pdf?ver=2018-05-31-143332-863</ref>).
**This project took place for Harding Township in New Jersey back in 2001. The performance assessment showcased the ability of a Vortechnics Oil/Grit separator followed by a sand filter's removal ability over three years located at a rest stop off a nearby highway. A full storm analysis was conducted over the three-year project and found that the average TSS (mg/L) entering the Oil/Grit separator was 492 mg/L whereas the outlet of the separator had only 35.18 mg/L of TSS remaining (a ~93% reduction rate). Once water passed through the sand filter after the OGS, the removal efficiency increased to 98.12%, with only 9.28 mg/L of TSS remaining (Greenway, 2001<ref>Greenway, R.A. 2001. Stormwater Treatment Demonstration Project—Oil water/grit separator followed by a sand filter: RTP Environmental Associates. Inc., prepared for Harding Township, NJ, Environmental Commission and the New Jersey Department of Environmental Protection, Paper WM-668. https://www.conteches.com/Portals/0/Documents/Product%20Evaluation%20and%20%20Testing/vx_harding_township.pdf?ver=2018-05-31-143332-863</ref>).
*[https://www.eeer.org/upload/eer-14-4-262-.pdf (Jianghua, et al. 2009) - Performance Analysis of a Hydrodynamic Separator for Treating Particulate Pollutants in Highway Rainfall Runoff.]
*[https://www.eeer.org/upload/eer-14-4-262-.pdf (Jianghua, et al. 2009) - Performance Analysis of a Hydrodynamic Separator for Treating Particulate Pollutants in Highway Rainfall Runoff.]
** This study examined the separation characteristics of particles in runoff from paved roads using a OGS hydro cyclone design. The results indicated the TSS concentration ratio between the overflow and inflow (TSSover/in) decreased as a function of the operational pressure and the particle removal efficiency was mainly affected by the particle size. By using highway runoff results showed that removal efficiency was greater than 60%. The TSSover/in was (0.26 mg/L – 0.41 mg/L) below the Canadian Water Quality Guidelines (CWQGs) (Jianghua, et al. 2009<ref>Jianghua, Y., Qitao, Y. and Kim, Y. 2009. Performance analysis of a hydrodynamic separator for treating particulate pollutants in highway rainfall runoff. Environmental Engineering Research, 14(4), pp.262-269. https://www.eeer.org/upload/eer-14-4-262-.pdf</ref>).
** This study examined the separation characteristics of particles in runoff from paved roads using a OGS hydro cyclone design. The results indicated the TSS concentration ratio between the overflow and inflow (TSSover/in) decreased as a function of the operational pressure and the particle removal efficiency was mainly affected by the particle size. By using highway runoff results showed that removal efficiency was greater than 60%. The TSSover/in was (0.26 mg/L – 0.41 mg/L) below the Canadian Water Quality Guidelines (CWQGs) (Jianghua, et al. 2009<ref>Jianghua, Y., Qitao, Y. and Kim, Y. 2009. Performance analysis of a hydrodynamic separator for treating particulate pollutants in highway rainfall runoff. Environmental Engineering Research, 14(4), pp.262-269. https://www.eeer.org/upload/eer-14-4-262-.pdf</ref>).
*[https://pubmed.ncbi.nlm.nih.gov/24845330/ (Lee, et al. 2014) - Performance evaluation and a sizing method for hydrodynamic separators treating urban stormwater runoff.]
*[https://pubmed.ncbi.nlm.nih.gov/24845330/ (Lee, et al. 2014) - Performance evaluation and a sizing method for hydrodynamic separators treating urban stormwater runoff.]