THE MAGAZINE FOR THE DRAINAGE, WATER & WASTEWATER INDUSTRIES
CASE STUDIES
responsive. Both businesses were highly involved in the start-up of equipment – and any troubleshooting that was needed. They also organized good quality training, kept us up to date and provided meaningful warranties”.
The real fun began at Baldwin in March 2019 when as part of the upgrade, new, larger pumps were installed to help move the legacy of grit, which was estimated to be occupying around two thirds of the force main.
For Infrastructure Alternatives of Rockford, who professionally manage 130 wastewater treatment plants, Division Director, John Barthels, said: “Getting all this accumulated grit out of the line resulted in a huge amount of material for the Lakeside equipment to deal with – probably around six to ten times the normal amount. We knew from other treatment plants that Lakeside performs very well, but this was a big test. It certainly demonstrated its robustness”.
He added: “Historically, infrastructure in the US has been underfunded, so as operators we have to squeeze as much out of it as we can. With Lakeside though, which is high-end quality – and by working with equally trustworthy companies such as Dubois Cooper – and Fishbeck, we know that this is very long- lasting equipment”.
Over a wide range of daily flow rates, Lakeside’s SpiraGrit Vortex Grit System captures grit particles in the flat-floor circular upper grit chamber. Rotating paddles maintain the flow velocity inside the grit chamber, with grit removed from the storage hopper by a self- priming pump to a Raptor Dry Grit Washer. Organics are separated from the grit particles via the introduction of upwardly directed wash water and a grit stirrer assembly. The removed organics are automatically recycled back to the process. After removal of the organic material,
the clean grit is removed via a grit dewatering screw and discharged into a dumpster.
In the headworks channel, Lakeside’s Raptor Micro Strainer Screen captures debris such as plastics, hygienic articles and fibers. A brush on the central screw cleans the screenings basket and conveys solids up to the compaction zone/ dewatering chamber. After passing through the compaction zone, the dewatered solids enter a discharge chute which directs the solids into a dumpster at a lower level.
The screen and grit equipment were constructed from Type 316 stainless steel for superior corrosion resistance.
‘An amazing amount of grit’
Jim Truxton, President, Village of Baldwin, added: “There was an amazing amount of grit. For the first six months of the installation, a 10 cubic yard dumpster was filled to the brim - every week. Now that the process has settled down after that initial wave of grit, the whole thing works just fine. All that is required is some periodic cleaning and basic preventative
maintenance”.
Lakeside’s Raptor Micro Strainer Screen and SpiraGrit Vortex Grit System are no strangers to large volumes of grit from septic tanks. At Indian River County’s Residuals Dewatering (Biosolids) Facility in Florida, the equipment successfully deals with wastes from commercial, industrial and municipal sources, as well as a huge volume of residential septic tank cleanings.
“One way or another, it’s been quite a journey”, said Jim Truxton. “With or without North Lake Correctional Facility, we now have a very professionally managed wastewater treatment plant with equipment that delivers excellent performance for the long-term. Plus, we have a team of highly skilled and conscientious professionals behind us all the way. With our groundwater discharge and close proximity to such a precious waterway as the Pere Marquette, we rightly have to be very careful with our treatment processes. If somebody pees in the river, the EPA are there before they’ve zipped their fly back up”.
FOLLOW US
October 2021 |
45
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76
