The focus on effective grit removal is getting a lot more intense lately. Grit has become a hot topic. Last year, an all day Grit Workshop was held at WEFTEC. There were eight grit related papers presented including six addressing “A Focus on Grit Removal and Handling Strategies”. Of particular interest are settling characteristics and removal efficiencies of various technologies. The performance of historical, conventional mechanically induced vortex (MIV) units was questioned. The HeadCell was shown to outperform MIV systems. Contact us for a more detailed summary of this year’s papers.
We’d like to think the focus on grit has something to do with Hydro’s growing installation base of highly effective grit removal systems and satisfied customers throughout the United States. Right here in Kentucky, Indiana and Ohio are more than twenty Hydro grit removal systems in operation. Until now, most design engineers and plants did not have accurate reference data to use in effective grit system design, but they do now.. Hydro International now has available national and regional grit gradation data which is the result of more than 120 tests across North America. The data includes valuable average physical sizes as well as information on settling velocity (SES), making it the most comprehensive information available on grit and its behavior. We welcome the opportunity to share this valuable data with you. Contact us for specific gradation information. (Click here for gradation flyer)
Also from Hydro International:
A Product Spotlight – Hydro Vortex Drop™ Shaft
The Hydro Vortex Drop™ Shaft is a self-activating system with no moving parts that quietly and safely drops flow (water, stormwater or wastewater) from virtually any height. It offers improved flow characteristics, significant cost savings and better odor, corrosion and erosion control when compared to conventional drop systems.
The Hydro Vortex Drop™ Shaft can be retrofit into an existing chamber and its integrated access and small pipe sizes reduce excavation cost, shaft diameters and the need for a separate access shaft. The system also benefits from a compact and simple to construct inlet chamber with no complicated curves or benching required. With its unique operation and powerful mixing on the outlet of the system, the dissolution of gases into the liquid rather than releasing it into the chamber or atmosphere eliminates odors and corrosion problems based on high H2S concentrations. Learn more.
Source: Hydro International
Hydro International made an announcement at this year’s WEFTEC to expand their grit system capabilities. The GritCup™ and SpiraSnail™ grit washing and dewatering system are the latest additions to Hydro’s line of Advanced Grit Removal. The GritCup™ and SpiraSnail™ uses many of the best design features found in Hydro’s advanced grit removal systems. The free vortex washing in the GritCup™ provides highly effective grit washing reminiscent of the Eutek TeaCup® and SlurryCup™. The SpiraSnail™ clarifier design is based on the same hydraulic principles as the Eutek HeadCell® utilizing the conical shape to provide the surface area required to remove fine grit particles. The end result is a system that offers cost-effective automated grit washing and dewatering with no water requirement.
The GritCup™ and SpiraSnail™ are designed for plants with peak flows up to 10 mgd. The system is guaranteed to capture 90% of all grit 106 micron and larger with less than 20% volatile solids and greater than 60% total solids in output grit.
Boonville, IN CSO Facility – Primary Equivalency and 4mm screening for 8 cents per gallon from Hydro International. Please see new facility picture and details
in the attached link.
Shipment of the world’s two largest Storm King units took place on June 29th. The units treat combined sewerage for the City of Boonville, Indiana. Each 44 ft. Storm King provides primary treatment equivalency, 4mm screenings removal, and in-vessel disinfection to an e-coli limit of 235 cfu/100 mL at 42 mgd. Nine tractor trailer trucks were required to ship just one of the 75,000 pound units. The following link will allow you to download a brief photo sheet, with this announcement that is suitable for distribution to clients. A full case study will be made available once the project is fully operational. The download includes assembly photos depicting the enormity of the unit
The City of Newark started up their new 30 mgd High Rate Treatment (HRT) facility in 2011. Wet weather flow is diverted to the HRT when plant capacity is exceeded. Effluent criteria is a minimum 80% removal of TSS and 126/100 ml E. Coli.
The entire 30mgd facility fits on a 65 ft x 195 ft footprint.
Major items of the process include:
1. Pumps – Five Flygt pumps, each 6000 gpm at 30 ft
2. Screens – Two Parkson AquaGuard™ Screens, 6mm, each 15 mgd
3. Grit Removal – Two Eutek Headcells™ by Hydro International, each 15 mgd, 12 ft dia, 904 sq ft surface area(each), 95% removal greater than 150 mesh
4. HRT – two 15 mgd Actiflo™ units by Kruger, 60gpm/sf
5. UV Disinfection – One Trojan Trojan UV4000Plus, 28 mgd