Hydro-Sludge® Screen
Overview
Engineered by Hydro International, the Hydro-Sludge® Screen is an in-line pressurized device that screens unwanted debris from sludge and dewaters the material in one operation. The system is designed for performance in this challenging application.
The enclosed system reduces odor problems, has no washwater requirements, and allows for a pressurized discharge.
Applications
- Screening primary, secondary, and combined sludges
- Industrial screening from direct tanker, pumped feed, or combined sludges
- Maritime ship-board preliminary treatment
Engineered by Hydro International, the Hydro-Sludge® Screen is an in-line pressurized device that screens unwanted debris from sludge and dewaters the material in one operation. The system is designed for performance in this challenging application.
The enclosed system reduces odor problems, has no washwater requirements, and allows for a pressurized discharge.
Applications
- Screening primary, secondary, and combined sludges
- Industrial screening from direct tanker, pumped feed, or combined sludges
- Maritime ship-board preliminary treatment
Benefits
Remove, compact and dewater solids from sludge in a single process
Hydro-Sludge Screen removes nuisance materials like strings, rags, and cellophane from sludge to increase the value of your biosolids and preserve your sludge treatment and handling performance and capacity.
Improve downstream process efficiency
Offering a range of screen sizes, the Hydro-Sludge® Screen reduces loading on downstream processes and improves overall treatment effectiveness. Able to handle a dry solids capacity of up to 9%, the equipment removes solids early on in the sludge management process, minimizing the clogging that would otherwise reduce subsequent treatment efficiency.
Maintenance friendly features
With a range of screen sizes, the Hydro-Sludge® Screen reduces debris accumulation in downstream processes and improves overall treatment effectiveness. The system removes solids early on in the process that would otherwise reduce downstream sludge treatment efficiency and minimizes the potential for clogging. The reverse function, access hatch, drain connections and extended discharge area makes routine inspection, cleaning, and maintenance activities quick, simple, and safe.
The self-lubricating sleeve on the retention cone eliminates the need for greasing and keeps the motor load consistent. Increased retention cone travel allows easy access to clean out the screenings plug during infrequent screen replacement.
A bolted end plate on the discharge end allows easy access and replacement of the retention cone without the need to drain or split the machine.
Save money on solids handling
Delivering screenings at 40% total solids, the Hydro-Sludge® Screen removes, compacts, and dewaters coarse material in sludge in a single piece of equipment to reduce the solids handling burden, cutting the cost of screened solids management, transport, and disposal.
Reduce operational costs
The Hydro-Sludge® Screen reduces the dewatering required for screenings – cutting handling costs. The system is fully automatic for continuous or intermittent screening of sludges with varying dry solids content. The system removes solids early on in the process that would otherwise reduce downstream sludge treatment efficiency and minimizes the potential for clogging.
How It Works
The primary components of the Hydro-Sludge® Screen are the inlet, screening zone, pressing zone and the screenings discharge area. The unscreened sludge is pumped to the inlet and directed into the screening zone. Sludge flows through the perforated screen and exits via a flanged connection. Non-compressible solids larger than the 0.2 in. (5mm) perforations are retained within the screen basket and transported to the dewatering zone by the rotating screw made of durable cast iron or carbon steel.
The separated solids are further concentrated in the pressing zone, transported by the pressing screw, and compacted into a plug under gradually increasing compression. This is achieved by the regulation of the backpressure cone against the compacted screenings. Liquid from the pressing zone is drained through the fine perforations in the reinforced dewatering screen, and fed back with the drained sludge from the inlet screens.
As the screenings plug is formed, the drive load increases pushing the screenings against the backpressure cone. The drive load is monitored and converted to a pneumatic pressure, which adjusts the backpressure on the cone to release solids. The dewatered solids fall through the screenings outlet and are collected in a solids receptacle for final disposal. Unit operations are controlled by a PLC control panel with an HMI screen. Adjustments to operating parameters are easily made at the control panel.
Performance
Dry Solids Capacity and Flow Rate
| % Dry Solids Content | Flow Rate |
|---|---|
| 0–1% | 660 gpm (42 L/s) |
| 2% | 485 gpm (31 L/s) |
| 3% | 420 gpm (26 L/s) |
| 4% | 350 gpm (22 L/s) |
| 5% | 330 gpm (21 L/s) |
| 6% | 310 gpm (19 L/s) |
| 7% | 265 gpm (17 L/s) |
| 8% | 240 gpm (15 L/s) |
| 9% | 220 gpm (14 L/s) |
Design Notes
- Augers are available in cost-effective, long-life carbon steel or optional stainless steel
- Fully automatic for either continuous or intermittent screening of sludge with varying dry solids content
- 3–10 mm diameter screen perforations
- Drain connections allow easy maintenance
Specs & Downloads
