Bid was canceled and not going to republish. Operation of Waste Water Plant The scope of services for wastewater operations and maintenance includes the wastewater treatment facility described below. Wastewater Treatment Facility. The Winchendon Wastewater Treatment Facility (WWTF) was upgraded in 1973 and 2004 to provide secondary treatment of wastewater. The facility is designed to handle an average daily flow of 1.1 million gallons with peak
hour of 4.9 million gallons. The facility is located on the south bank of the Millers River, north of River Street. The access road to the facility is off River Street, approximately one mile from the intersection of Main and River Street. Process Description. Raw wastewater enters the facility through a 24-inch influent line, from which point it flows by gravity through the influent Parshall flume. Flow is macerated in the influent channel grinder, then the wastewater flows from the channel grinder to the two primary clarifiers. The 45-foot diameter primary clarifiers are used to settle the primary sludge and waste
secondary sludge's are co-settled. The settled sludge's are pumped from the primary clarifiers to the sludge blend tank for processing and disposal. From the primary clarifiers, the wastewater flows to the secondary treatment system, which includes two aeration basins and two 70-foot diameter secondary clari-flocculators. Treated wastewater is discharged from the secondary treatment system and flows by gravity to the ultra-violet disinfection system tanks. Following disinfection, the flow is discharged to the effluent Parshall flume and then to the Millers river.
Activated sludge can be both recycled to the aeration basins, and/or wasted out of the system as required. Waste activated sludge (WAS) can be pumped to the primary clarifiers for co-settling, or to the sludge blend tank, which flows by gravity into the gravity sludge thickener. Alternatively, WAS can be directly pumped to a tanker truck. One 26-foot diameter gravity thickener is used for thickening the combined sludge's up to 6 percent. Currently, thickened sludge is hauled to a neighboring community where it is dewatered. Each proposal must be accompanied by a binding proposal security deposit in the form of a bid bond or certified check in the amount of one hundred thousand dollars ($100,000). The deposit
shall be made payable to the Town of Winchendon During any construction work performed by CONTRACTOR, CONTRACTOR shall ensure that Massachusetts prevailing wages are paid for such work, and that the CONTRACTOR furnishes a performance bond and payment bond each in the amount of 100 percent of the cost of construction issued by a surety qualified to do business in Massachusetts and satisfactory to the TOWN.
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