Sludge Dewatering and Drying

• US 20100170854A1
• Filed: 12/28/2009
• Published: 07/08/2010
• Est. Priority Date: 01/06/2009
• Status: Abandoned Application

• Current Assignee: Severn Trent De Nora, LLC (Inframark, LLC.)
• Original Assignee: Severn Trent De Nora, LLC (Inframark, LLC.)
• Inventors: Reeves, Tommy, Casbeer, Dana, Bariya, Rubin
• Application Number:
  US12/648,041
• Publication Number:
  US 20100170854A1
• Time in Patent Office: Days
• US Class Current: 210/710
• CPC Class Codes: B63J 4/004 for treating sludge, e.g. tank washing sludge
• CPC Class Codes: C02F 1/56 Macromolecular compounds
• CPC Class Codes: C02F 11/147 using organic substances C02F11/148 takes precedence
• CPC Class Codes: C02F 2103/008 Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
• CPC Class Codes: C02F 2209/005 Processes using a programmable logic controller [PLC]
• CPC Class Codes: C02F 2209/11 Turbidity
• CPC Class Codes: C02F 2209/42 Liquid level
• CPC Class Codes: F26B 1/00 Preliminary treatment of solid materials or objects to facilitate drying , e.g. mixing or backmixing the materials to be dried with predominantly dry solids F26B5/005 takes precedence
• CPC Class Codes: F26B 2200/18 Sludges, e.g. sewage, waste, industrial processes, cooling towers
• CPC Class Codes: F26B 5/00 Drying solid materials or objects by processes not involving the application of heat separating liquids from solids by straining B01D; replacing liquids in wet solids by other liquids, e.g. water by spirit, B01D12/00; drying by electrophoresis B01J

Abstract

Methods, apparatus and systems for dewatering and drying the dewatered sludge. Sludge pumped into the sludge dewatering apparatus is mixed in-line with a pre-measured quantity of polymers to agglomerate solids entrained in the sludge. The agglomerated sludge is routed to a filtration station comprising filtration chambers. The filtration chambers are fitted with industry standard filter bag. The agglomerated sludge is subjected to dewatering in the filter bags and the dewatered sludge is subsequently compacted, dried and discarded.

Claims

1. A method for dewatering sludge, the method comprising:

introducing a pre-measured quantity of one or more polymers into the sludge to agglomerate entrained solids;

routing the agglomerated sludge to an integral primary filtration station, the primary filtration station comprising one or more primary filtration chambers, each of the primary filtration chambers further defining a cylindrical cavity for receiving at least one industry standard filter bag; and

dewatering the agglomerated sludge within the filter bag.

2. The method of claim 1, further comprising mixing in-line the polymers with the sludge prior to routing the agglomerated sludge to the primary filtration station.

3. The method of claim 1, further comprising controlling the routing of the agglomerated sludge by selectively actuating one or more valves, the valves connected to piping transferring the agglomerated sludge to the filter bag.

4. The method of claim 1, further comprising introducing a high volume of air into the primary filtration chambers for facilitating dewatering of the agglomerated sludge.

5. The method of claim 1, further comprising introducing heated air into the primary filtration chambers for facilitating drying of the agglomerated sludge retained in the filter bag.

6. The method of claim 1, further comprising compacting the agglomerated sludge within the filter bag by mechanically pressing the filter bag, the mechanical pressing further facilitating dewatering of the agglomerated sludge.

7. The method of claim 1, wherein the dewatering of the agglomerated sludge is a mechanical step selected from the group consisting of gravity draining, blow drying, heating, vacuuming, squeezing and pressing.

8. The method of claim 1, comprising collecting an effluent drained from sidewalls of the filter bag during the dewatering, wherein the level of the collected effluent is monitored, and further wherein the effluent is discarded when the effluent level reaches a pre-determined level.

9. The method of claim 1, further comprising coupling one or more filtration stations to the primary filtration station for expanding sludge dewatering capacity.

10. A sludge dewatering apparatus comprising:

a self-contained primary module, the primary module comprising a primary mounting rack configured to support;

an integral sludge transfer pump;

a polymer storage tank;

a polymer injection pump connected to the polymer storage tank;

a primary filtration station comprising one or more primary filtration chambers, each of the primary filtration chambers defining a cylindrical cavity configured to receive one or more industry standard filter bags therein; and

a substantially rigid primary platform perpendicularly oriented and securably coupled to the primary mounting rack, wherein the primary platform is positioned adjacent to the primary filtration chambers.

11. The sludge dewatering apparatus of claim 10, wherein the primary filtration chamber comprises a durable non-corrosive material.

12. The sludge dewatering apparatus of claim 11, wherein the non-corrosive material comprises polyvinyl chloride (PVC) or coated steel.

13. The sludge dewatering apparatus of claim 10, wherein the primary filtration chamber comprises an upper access lid, the access lid further comprising a handle pivotally connected to an upper surface of the lid.

14. The sludge dewatering apparatus of claim 10, wherein the filter bag further comprises at least one pair of built-in handles.

15. The sludge dewatering apparatus of claim 10, further comprising:

piping means for transferring agglomerated sludge to the one or more filtration chambers;

selectively actuatable valves positioned on the piping means; and

a control panel comprising a programmable logic controller (PLC), the PLC configured to control the valves.

16. The sludge dewatering apparatus of claim 10, further comprising:

a piping header disposed beneath the filtration chambers;

automated means for detecting an effluent level in the piping header; and

a drainage pump in fluid connection with the common piping header.

17. The sludge dewatering apparatus of claim 10, further comprising one or more pairs of dewatering plates, wherein the filter bag is positioned between the pair of dewatering plates.

18. The sludge dewatering apparatus of claim 17, further comprising mechanical and/or hydraulic means for actuating the dewatering plates.

19. The sludge dewatering apparatus of claim 10, further comprising an air blower disposed adjacent the filtration chambers.

20. The sludge dewatering apparatus of claim 10, further comprising one or more secondary modules disposed laterally, the secondary module comprising a secondary filtration station, the secondary filtration station further comprising one or more secondary filtration chambers and a secondary platform, wherein the secondary module is coupled to the primary platform.

21. A sludge dewatering system, the system comprising:

a wastewater treatment system configured to treat wastewater; and

a sludge dewatering apparatus upstream from the wastewater treatment system, the sludge dewatering apparatus comprising;

a self-contained primary module, the primary module comprising a primary mounting rack configured to support;

an integral sludge transfer pump;

a polymer storage tank;

a polymer injection pump connected to the polymer storage tank;

a primary filtration station comprising one or more primary filtration chambers, each of the primary filtration chambers defining a cylindrical cavity configured to receive one or more industry standard filter bags therein; and

a substantially rigid primary platform perpendicularly oriented and securably coupled to the primary mounting rack, wherein the primary platform is juxtaposed adjacent to the primary filtration chambers,

wherein the sludge dewatering apparatus is connected to the wastewater treatment system by a sludge transfer pipe.