Megacell H, a compact solution for a plant in a cave
The new municipal treatment plant in Tremosine, Italy, officially started in July 2012. Designed to serve small municipalities located on the shores of Lake Garda the plant had to both blend in with the beautiful landscape and provide the best solutionfor water treatment, as it discharges directly in the lake. The solution has been to utilise an abandoned road gallery, running a few meters above the lake water level. The sewage flows to this cave the surrounding small towns hundreds of meters higher up the hill side by means of pipes running through the mountain. Once this connection was made the plant design process startedwithin the rigid constraints of the small volume available in the cave for the installation of MBBR tanks and treatment equipment. Dissolved Air Flotation was the accepted solution selected for clarification stage,with KWI Megacell H considered to be the best option, offering both a small footprint and high removal rate of suspended solids coupled with a high floated sludge consistency.
The plant has been provided by KWI Italy and consists of two Megacell MCH 40 unitsable to manage up to 780 m3/hr in a very compact installation. Flotation is the only solution for solids removal with MBBR, due to the low density of solids. The Megacell technology offers both a very high solids removal percentage and high consistency of floated sludge, with low energy and chemical consumption.
The special construction of these Megacell units, supplied preassembled but cut in two parts, made it possible to transport the equipment to site using the tiny roads and galleries of the lake shore and at the same time ensuring a simple erection operation.