Draimad 6BCAP Sludge Dewatering Unit (4 of 4)

Draimad 6BCAP Sludge Dewatering Unit, 304 Stainless Steel, complete with (6) stainless steel baskets, control panel mounted to unit. NEMA 4X fiberglass mounted to Draimad to house air pressurization kit including Thomas rotary vane compressor, 1/8 HP, 1.5 CFM/6- hour spring wound timer, H-O-A switches, air-cooled fan and Bellofram Type 70 pressure regulator with Noshok low pressure gauge. Complete with stainless steel doors. S/N DRA06-164A. Also included: (1) Model IBF-100 sludge conditioning unit (S/N BAT90-146) complete; (1) aluminum pump stand, (1) 90 gallon polyethylene tank with stainless steel shaft & propeller. (1) Model 3K231 General Electric 1 HP TEFC industrial motor (115V/60Hz/1Phase). (1) Model 6K334 Maxi-Torq 1/6 HP gearmotor. Model 2130-32 Flojet Polymer Feed Pump. (1) Model 367 Robbins-Meyers Moyno Progressive Cavity Sludge Pump. (1) Automatic Control Panel/NEMA 4X fiberglass enclosure. Total hours: 669 . (6) Bag unit takes 1 to 1-1/2 hours to fill.

Basic Concepts: The Draimad dewatering system consists of a unit from which disposable porous bags are hung. Sludge is injected with a flocculant and mixed thoroughly through a serpentene static mixing tube in a polymer feed system. The flocculated sludge is then pumped into an enclosed hood just above the hanging bags. The sludge freely flows into the bags, where the solids are retained, and the water passes through into a drain located beneath the suspended bags. The water that passes through the bags is then recycled back back to the plant. Once the system is started, it operates automatically. The sludge is pumped until the (6) bags are full. Once the bags are full with sludge, the system continues to pump sludge until the level reaches a high level sensor located in the hood. The system then shuts down for a rest period, allowing excess water in the bags to flow through. As this water is drained, excess sludge in the hood continues to flow into the bags. When the sludge level in the hood reaches a low level sensor, the pump is reactivated. This refilling process repeats itself for the length of a designated work cycle. Timing sequences are programmed into the system to provide safeguards. If it takes too long to initially fill the bags, such as might occur if the sludge pump fails or the sludge tank is empty, the system goes into an alarm condition and shuts down. If the refilling of bags takes too long, the system similarly goes into an alarm condition and turns off. At the end of the work cycle the system completely shuts itself down. The filled bags are then allowed to remain above the drain, typically until the following day, and are removed at the operators convenience.

The pump used to supply sludge and polymer mixture to the bags is a progressive cavity pump, which is also used as a metering device. By maintaining a known rate of pumping, the polymer feed can be set to give a constant polymer to sludge ratio. The polymer is pumped from a feed tank to the sludge stream using a double piston flow jet pump. A convenient sampling port allows the operator to sample the sludge-polymer mixture and to visually determine if the polymer feed rate needs to be adjusted. The sludge pump is mounted beneath the polymer feed system. The configuration of the feed system provides easy access to all parts so they can be readily serviced and cleaned.

This system was purchased new in 1997 for $27,000. It is in very good condition. Please make a reasonable offer. All offers will be considered.

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