Title:
DRAINAGE SLUDGE DEHYDRATION AND DRY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2000/071222
Kind Code:
A2
Abstract:
The object of this invention is to provide a sludge dehydration and dry system. This system feeds sludge-laden waste liquid from a sludge inlet unit (10) to pressure vessels of an automatic pneumatic pump (20), and feeds waste liquid to a dehydration unit (30) by pressurizing the surface of waste liquid within the vessels using compressed air, thus dehydrating the sludge to form sludge cakes, and dries the sludge cakes at the filter plates (33) of the unit (30) using compressed air from a dry unit (18). The moisture content of the sludge cakes within the dehydration unit is reduced by inflating the membranes (90) with compressed air. After the sludge compression and dehydration process, the filter plates are separated from each other by a separation unit (34), and so the resulting sludge cakes are dropped from the filter plates onto a feeding conveyor (37) to be discharged from the system.
Inventors:
PARK SE JUN (KR)
Application Number:
PCT/KR2000/000475
Publication Date:
November 30, 2000
Filing Date:
May 16, 2000
Export Citation:
Assignee:
PARK SE JUN (KR)
International Classes:
B01D25/12; C02F11/12; F26B5/14; F26B25/00; (IPC1-7): B01D/
Foreign References:
| JPH09271800A | 1997-10-21 | |||
| JPH04313400A | 1992-11-05 | |||
| JPH0283100A | 1990-03-23 | |||
| EP0491247B1 | 1995-02-15 |
Attorney, Agent or Firm:
Lee, Sun Haeng (#305 Newseoul Building 828-8 Yeoksam-dong
Kangnam-ku Seoul 135-080, KR)
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Claims:
Claims
| 1. | A drainage sludge dehydration and dry system, comprising: a sludge inlet unit; an automatic pneumatic pump connected to said sludge inlet unit through a pipeline and receiving sludgeladen waste liquid from the sludge inlet unit using atmospheric pressure or separate pumping pressure, said pneumatic pump consisting of : one or more pressure vessels commonly connected to said sludge inlet unit through the pipeline to receive the waste liquid from the sludge inlet unit, said vessels being alternately operated to allow the pneumatic pump to be continuously operated during an operation of the system; a liquid inlet valve mounted on the pipeline extending to each pressure vessel for controlling an inflow of waste liquid into each vessel; a liquid level sensing unit consisting of upper and lower level sensors installed within each pressure vessel for sensing upper and lower levels of waste liquid within each vessel; an air compression solenoid valve provided at each vessel for injecting compressed air into each vessel; an air exhaust solenoid valve provided at each vessel for exhausting compressed air from each vessel; a liquid outlet solenoid valve provided at each pressure vessel for controlling an outflow of waste liquid from each vessel; an air pressure dispersing member provided within each pressure vessel at an upper position around the air compression solenoid valve for dispersing the compressed air injected into each vessel; and a liquid pressure dispersing member provided within each pressure vessel at a lower position around the liquid inlet valve for dispersing the waste liquid injected into each vessel; a buffer tank commonly connected to said pressure vessels and used for preventing a water hammering of said pneumatic pump in the case of a closing of said liquid outlet solenoid valve during an operation of said pneumatic pump; a dehydration unit connected to said pneumatic pump, said dehydration unit consisting of : a fixed inlet terminal having a plurality of inlet ports so as to be connected to a plurality of inlet pipes; a movable plate positioned opposite to said fixed inlet terminal so as to be movable relative to the inlet terminal; a plurality of filter plates regularly and movably set between the fixed inlet terminal and the movable plate, said filter plates being individually covered with a fabric filter; a membrane provided between each filter plate and an associated fabric filter; a compressed air injection nozzle connected to the membranes so as to inflate the membranes with compressed air for compressing sludge by the membranes, thus forming sludge cakes between the filter plates and dehydrating the sludge cakes in cooperation with the fabric filters so as to reduce the moisture content of the sludge cakes; and a filter plate separation unit connected to said movable plate so as to move the movable plate relative to the fixed inlet terminal, thus separating the filter plates from each other when necessary to allow the sludge cakes to be removed from the filter plates; a dry unit connected to a liquid discharging line extending from said buffer tank to the inlet terminal of the dehydration unit, thus supplying compressed air from a compressed air supply unit to the dehydrated sludge cakes within the dehydration unit so as to dry the sludge cakes; a sludge cake feeding conveyor installed at a position under said dehydration unit so as to receive and feed sludge cakes dropped from the filter plates when the filter plates are separated from each other by the filter plate separation unit; a fabric filter washing unit used for washing sludge remaining in the fabric filters of the filter plates by injecting pressurized washing water from its water injection nozzle to the fabric filters after dropping the sludge cakes from the filter plates onto the sludge cake feeding conveyor, said washing unit also having a washing water tank and a water pump, with sludgeladen washing water being drained from the dehydration unit to a separate sludge treatment facility through a water discharging pipe; and a microcomputer controlling an operation of the system. |
| 2. | A drainage sludge dehydration and dry system, comprising: a sludge inlet unit; an automatic pneumatic pump connected to said sludge inlet unit through a pipeline and receiving sludgeladen waste liquid from the sludge inlet unit, said pneumatic pump consisting of : one or more pressure vessels commonly connected to said sludge inlet unit through the pipeline to receive the waste liquid from the sludge inlet unit, said vessels being alternately operated to allow the pneumatic pump to be continuously operated during an operation of the system; a liquid inlet valve mounted on the pipeline extending to each pressure vessel for controlling an inflow of waste liquid into each vessel; a liquid level sensing unit consisting of upper and lower level sensors installed within each pressure vessel for sensing upper and lower levels of waste liquid within each vessel; an air compression solenoid valve provided at each vessel for injecting compressed air into each vessel; an air exhaust solenoid valve provided at each vessel for exhausting compressed air from each vessel; a liquid outlet solenoid valve provided at each pressure vessel for controlling an outflow of waste liquid from each vessel; an air pressure dispersing member provided within each pressure vessel at an upper position around the air compression solenoid valve for dispersing the compressed air injected into each vessel; and a liquid pressure dispersing member provided within each pressure vessel at a lower position around the liquid inlet valve for dispersing the waste liquid injected into each vessel; a buffer tank commonly connected to said pressure vessels and used for preventing a water hammering of said pneumatic pump in the case of a closing of said liquid outlet solenoid valve during an operation of said pneumatic pump; a dehydration unit connected to said pneumatic pump, said dehydration unit consisting of : a fixed inlet terminal having a plurality of inlet ports so as to be connected to a plurality of inlet pipes; a movable plate positioned opposite to said fixed inlet terminal so as to be movable relative to the inlet terminal; a plurality of filter plates regularly and movably set between the fixed inlet terminal and the movable plate, said filter plates being individually covered with a fabric filter and compressing sludge so as to form sludge cakes and dehydrate the sludge cakes in cooperation with the fabric filters so as to reduce a moisture content of the sludge cakes; and a filter plate separation unit connected to said movable plate so as to move the movable plate relative to the fixed inlet terminal, thus separating the filter plates from each other when necessary to allow the sludge cakes to be removed from the filter plates; a dry unit connected to a liquid discharging line extending from said buffer tank to the inlet terminal of the dehydration unit, thus supplying compressed air to the dehydrated sludge cakes within the dehydration unit so as to dry the sludge cakes; a sludge cake feeding conveyor installed at a position under said dehydration unit so as to receive and feed sludge cakes dropped from the filter plates when the filter plates are separated from each other by the filter plate separation unit; and a microcomputer controlling an operation of the system. |
| 3. | A drainage sludge dehydration and dry system, comprising: a sludge inlet unit; an automatic pneumatic pump connected to said sludge inlet unit through a pipeline and receiving sludgeladen waste liquid from the sludge inlet unit, said pneumatic pump consisting of : one or more pressure vessels commonly connected to said sludge inlet unit through the pipeline to receive the waste liquid from the sludge inlet unit, said vessels being alternately operated to allow the pneumatic pump to be continuously operated during an operation of the system; a liquid inlet valve mounted on the pipeline extending to each pressure vessel for controlling an inflow of waste liquid into each vessel; a liquid level sensing unit consisting of upper and lower level sensors installed within each pressure vessel for sensing upper and lower levels of waste liquid within each vessel; an air compression solenoid valve provided at each vessel for injecting compressed air into each vessel; an air exhaust solenoid valve provided at each vessel for exhausting compressed air from each vessel; a liquid outlet valve provided at each pressure vessel for controlling an outflow of waste liquid from each vessel; an air pressure dispersing member provided within each pressure vessel at an upper position around the air compression solenoid valve for dispersing the compressed air injected into each vessel; an liquid pressure dispersing member provided within each pressure vessel at a lower position around the liquid inlet valve for dispersing the waste liquid injected into each vessel; and an aerator installed within each pressure vessel at a lower position around the liquid inlet valve, said aerator supplying compressed air into each vessel at the same time of inflow of waste liquid into the vessel, thus allowing the waste liquid to swirl along the sidewall of the vessel while forming vortexes along with air bubbles and thereby allowing the waste liquid to be actively mixed, agitated and thickened within the vessel; a buffer tank mounted to the outlet line commonly extending from said pressure vessels, with the interior of said buffer tank being partitioned into first and second chambers by a partition wall; and a microcomputer controlling an operation of the system. |
| 4. | The system according to claim 1 or 2, further comprising: means for preventing a leakage of oil pressure from an oil pump of said dehydration unit or an unexpected retraction of a piston rod of a cylinder head during an operation of said pneumatic pump after the filter plates are completely compressed by the piston rod actuated by oil pressure output from said oil pump. |
| 5. | The system according to claim 1 or 2, further comprising: means for dehydrating the sludge cakes within said dehydration unit using pressure supplied from another pressure pump in place of using said automatic pneumatic pump and drying the sludge cakes by injecting compressed air from the air supply line of said compressed air supply unit into the inlet ports of the fixed inlet terminal of said dehydration unit. |
Description:
INTERNATIONALSEARCHREPORT International applicationNo. Informationonpatentfamilvmembers0/00475 PatentdocumentPublication Patent family Publication citedinsearchreportdate member(s)date JP 09-271800 A21.10.97 None JP 04-313400 A05.11.92 None JP02-083100A23.03.90 None EP0491247B115.02.95 DE4140313A1 25.06.92 Art 118464E15.03.95