Lime Post Treatment

Lose water, save money

By adding an alkaline additive or kiln dust to sludge after initial processing, the Lime Post Treatment Modules further de-waters it, creating a dry, crumbly lime-slude mixture that will not clog equipment and is easy to haul and land fills or spread on farm land.

Product Data

Description

Lime treatment of wastewater solids is already Europe’s preferred method of recycling treated sludge. Today, it is quickly being mandated throughout America. Lime stabilization is generally more cost effective than alternative biosolids options. A series of studies comparing lime stabilization to composting, thermal drying and digestion technologies found that lime stabilization has unit costs as much as 60 percent lower than alternatives. Reduced capital cost requirements of lime stabilization are even more dramatic – particularly with communities with limited capital budgets. As populations rise and environmental standards tighten, the need for better solutions to sludge disposal becomes more critical. Roemix lime post treatment systems can be an economically-smart and ecologically-sound sludge hygienization option.

When it comes to sludge, dryer is better; and that is precisely what the Charter Machine Company Lime Post Treatment Modules achieve. The Lime Post Treatment Modules saves money by using less lime than comparable treatment. Plus its reversible converyor allows you to by-pass the unit completely if it is not needed. The RM450 Lime Post Treatment Module can handle 42,000 pounds of sludge per hour.
By addition of quicklime to dewatered sludge cake, a stabilized and/or disinfected biosolids can be produced.

Our systems are used:

• For Alkaline Sludge Stabilization (Class B)
• For Alkaline Sludge Disinfection (Class A)

Model LFS 600 and 1200

The Lime Storage Hopper and Feed System, Roediger Pittsburgh Model LFS 600 is complete with loading platform, steps and railings and oriented as shown on the project drawings. The lime storage hopper is made of welded carbon steel construction, leg mounted, square at the bottom, with sides sloped at 60 degrees minimum to the horizontal and complete with bag shelf and self supporting lid. Minimum capacity is 640 lbs. minimum quicklime (8 bags).

The minimum capacity for the Model LFS 1200 shall be 1200 lb. minimum quicklime (15 bags). Pulverized quicklime is conveyed by a 3" elevator screw and a 3" horizontal feed screw. The elevator screw is driven by a mechanically variable traction disc drive with 3/4 HP constant speed AC motor. The horizontal feed screw is driven by an infinitely adjustable SCR drive using a 1 HP DC motor. Speed control of the drives is in the lime post treatment or belt press control panel. Lime flow is maintained by means of a double agitator driven by a 0.5 HP constant speed AC drive plus an electrical vibrator, channel mounted on the hopper body.

All external surfaces shall be primed coated with two part epoxy of four (4) mil dry film thickness plus two (2) finish coats of two part epoxy at four (4) mil per coat dry film thickness. Drives and accessories shall be factory coated in similar manner. Controls, starters, lights and alarms shall be located in the lime post treatment or belt filter press control panel.

Models

Find the model that fits your capacity demands and contact Charter Machine Company for more information.

Models	Roediger Lime Post-Treatment Module (LPT) Maximum capacity range, lbs. of sludge per hour	LPT Mixer Dimensions*			Electrical Power Requirements
Models		length, overall (feet)	width, overall (feet)	height (feet) variable	Mixer (hp)	Reversible conveyor (hp)
RM150	2,000-8,000	7.2	2.4	1.7	3	0.75
RM240	3,000-12,000	9.3	3	2	5	0.75
RM350	8,000-25,000	9.3	3.5	2.5	7.5	1
RM450	14,000-42,000	9.3	4	2.9	10	1

Lime Post Treatment Modules can be added to existing equipment at current facilities.

Features

Reversible Conveyor

Reversible conveyor lets you feed into or bypass the unit

Controls

Group controls, starters, lights, and alarms in a single panel for the lime post treatment or in tandem with a belt filter press, enabling a streamlined operation.

Shaft Bearings

Shaft bearings shall be flange mounted on the mixer body and tubed to the external surface to allow lubrication while in operation.

Optional Loading Platform

The optional loading platform and steps are made of carbon steel tread plate. Railings protect both sides of the steps and all the platform except stair access and bag dump access. Platform height and orientation allow for comfortable access to the bag shelf. All platforms, steps, and railings if required will comply with OSHA standards.

Optional Dust Collector

Dust collector is flange mounted to the hopper body and will return collected dust to process without secondary handling, contamination, or waste. Filtered air vents to work area. Cleaning cycle can be automatically controlled by a solid-state timer in a factory mounted NEMA 12 enclosure. The until has a hinged access door for visual inspection of filter bags. The jet pipe and filter tube are capable of individual removal. Drive is 1 HP AC. The dust collector will require a minimum of 3/4” air connection.

Schematic

Roemix Lime Post Treatment Model RM240

RM schematic 1080 width

Lime Post Treatment Modules can be added to existing equipment at current facilities.

763 LFS1200 schematic 1920x1080

Benefits

Uses less lime than other lime treatment methods.
Reversible conveyor lets you feed into or bypass the unit.
High productivity- the LPT can handleup to 42,000 lbs. of sludge per hour.
Can be used in tandem with any dewatering equipment, including vacuum filters, centrifuges and belt filter presses.
Extremely energy efficient.
End product is PSRP and PFRP approved.