WO2014041594A1 - Sludge dehydration processing method and dehydration processing device - Google Patents
Sludge dehydration processing method and dehydration processing device Download PDFInfo
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- WO2014041594A1 WO2014041594A1 PCT/JP2012/073155 JP2012073155W WO2014041594A1 WO 2014041594 A1 WO2014041594 A1 WO 2014041594A1 JP 2012073155 W JP2012073155 W JP 2012073155W WO 2014041594 A1 WO2014041594 A1 WO 2014041594A1
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- sludge
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- press machine
- screw press
- concentrated
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Definitions
- the present invention relates to a technique for heating and dewatering sludge.
- a coagulation reaction tank, a sludge concentrator and a screw press are connected in sequence.
- Wastewater sewage is supplied to a coagulation reactor and a coagulant is added.
- This sewage aggregates into sludge.
- Sludge is supplied to a sludge concentrator and gravity dehydrated.
- This sludge has a reduced moisture content and is concentrated.
- Concentrated sludge is supplied to a screw press machine, dehydrated by gravity, and dehydrated by pressing. The concentrated sludge dehydrated by this screw press machine is further reduced in water content and becomes a dehydrated cake.
- the screw press machine supplies steam or hot air to the hollow portion of the screw shaft.
- the electric heater built in the screw shaft is operated.
- the outer peripheral wall of the screw shaft is heated.
- the screw shaft in the filterable outer cylinder rotates.
- the sludge is dehydrated while being heated on the outer peripheral wall of the screw shaft while being transferred while being compressed in the spiral transfer passage between the outer cylinder and the screw shaft.
- the temperature rises the viscosity of the liquid contained decreases, and the liquid is easily separated from the solid. It is dehydrated in a state where it is easy to dehydrate. Increases dewatering efficiency.
- the sludge passes through the outer peripheral wall of the screw shaft while being transferred through the spiral transfer passage between the filterable outer cylinder and the screw shaft. Heated indirectly.
- the outer peripheral wall of the screw shaft is made of a stainless steel plate. Indirect heating with a stainless steel plate intervenes has a problem that the heating efficiency is lower than direct heating without an intervening steel plate.
- the sludge heated in the coagulation reaction tank is supplied to the screw press machine in a state where the moisture content is reduced when the sludge is concentrated by the concentrator.
- the liquid separated from the sludge by the concentrator is not supplied to the screw press.
- the heat contained in the separated liquid is not used for dehydration in the screw press machine.
- the ripening added to the sludge in the coagulation reactor is not fully utilized. There is a lot of heat loss. There is a problem that the heating efficiency is not high.
- the present inventors concentrated sludge with a sludge concentrator and dehydrated it with a screw press machine, and heated directly by blowing steam or hot air into the sludge concentrated with a sludge concentrator.
- a method for heating and dehydrating sludge, characterized in that dehydration is performed in a state where the temperature is increased in a screw press machine Patent Document 2.
- Patent Document 2 The method of Patent Document 2 is based on the following idea.
- direct heating of sludge is after the sludge is concentrated with a sludge concentrator.
- the heated sludge is all dehydrated with a screw press and there is no heat loss. High heating efficiency.
- a flocculant is added to agglomerate. The agglutination reaction is favorably performed with the temperature raised. Dehydration efficiency is further increased.
- a direct heating chamber for directly heating sludge is provided between a sludge concentrator and a screw press.
- the direct heating chamber is provided with a direct heating device that blows steam or hot air into the sludge.
- a device for stirring sludge is provided.
- the sludge concentrated by the concentrator is supplied directly to the heating chamber.
- steam or hot air is blown into the sludge and the sludge is stirred.
- the sludge in the direct heating chamber is heated and the temperature rises, and the viscosity of the liquid contained decreases. The liquid is easily separated from the solid.
- This sludge is supplied to a screw press and dehydrated with a screw press.
- the direct heating chamber is provided with a device for adding a flocculant to the sludge.
- the sludge agglomeration reaction is carried out satisfactorily with the temperature raised. Dehydration efficiency with a screw press is further increased.
- the direct heating chamber in the first example is incorporated in the inlet portion of the screw press machine.
- the screw press machine has a charging passage connected to a spiral transfer passage between an outer cylinder and a screw shaft.
- the inlet side portion of the input passage and the transfer passage is directly used as a heating chamber.
- a direct heating device for blowing steam or hot air into the sludge is provided in the input passage.
- a stirring piece is provided on the inlet side of the screw shaft.
- a stirring device that stirs sludge with a stirring piece that rotates together with the screw shaft is formed in the inlet side portion of the transfer passage. The sludge concentrated by the sludge concentrator is supplied to the input passage of the screw press.
- This sludge sequentially passes through the input passage and the transfer port side portion of the transfer passage. At that time, steam or hot air is blown in and stirred with a stirring piece. Direct heating increases the temperature and facilitates separation of the liquid from the solid.
- This sludge is transferred while being compressed in the transfer passage and dehydrated. In the second example, the device becomes compact. Sludge is directly heated immediately before dehydration. The time and distance between direct heating and dewatering of the sludge is shortened. Less heat loss.
- the introduction passage is provided with a device for adding a flocculant to the sludge. The sludge agglomeration reaction is carried out satisfactorily with the temperature raised.
- the present invention further develops a sludge dewatering treatment method and a dewatering treatment device in which sludge is directly heated by a sludge concentrator and before dewatering by a screw press. .
- a sludge dewatering treatment method and a dewatering treatment device in which sludge is directly heated by a sludge concentrator and before dewatering by a screw press.
- the sludge dewatering method of the present invention is a method of dewatering sludge concentrated by a sludge concentrator using a screw press.
- the screw press machine is a screw press machine in which screw blades are not provided on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of an intermediate portion of the screw shaft.
- the concentrated sludge is directly heated by heated steam or hot air on the sludge inlet side of the transfer passage constituting the screw press machine, and dehydrated in the state where the sludge is heated in the screw press machine.
- the concentrated sludge is characterized by adding a sludge flocculant when it is directly heated.
- the dewatering apparatus of the present invention is used in the sludge dewatering method, and includes a sludge concentrator for concentrating sludge and a screw press for dewatering the concentrated sludge.
- the sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down a slope.
- the screw press machine is provided with no screw blades on the outer periphery of the screw shaft over a predetermined length in the axial direction of the middle portion of the screw shaft, and on the sludge inlet side of the transfer passage constituting the screw press machine.
- An input passage for directly heating the concentrated sludge is provided integrally with the transfer passage, and means for blowing heated steam or hot air into the input passage is provided. Further, the input passage of the dehydration apparatus further has means for adding a flocculant to the concentrated sludge.
- Another dehydration apparatus of the present invention includes a sludge concentrator that concentrates sludge and a screw press machine that dehydrates the concentrated sludge.
- the sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down the slope
- the screw blade is not provided on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of the intermediate portion of the screw shaft, and sludge in the transfer passage constituting the screw press machine is provided.
- a direct heating chamber connected to the inlet side is provided, and this direct heating chamber has a stirring means for stirring the concentrated sludge and a means for blowing heated steam and hot air.
- the stirring means is a stirring device that stirs sludge with a stirring piece that rotates together with the screw shaft.
- FIG. 3 is a schematic cross-sectional view taken along line AA in FIG. 2. It is a figure which shows the filling condition of the sludge in a transfer channel. It is a schematic elevation view of the sludge dehydration processing apparatus in the second example of the embodiment.
- the sludge aggregated in the aggregation reaction tank 1 is concentrated by the sludge concentrator 11 and dehydrated by heating directly in the screw press machine 31.
- the sludge dewatering apparatus of the present invention sequentially connects a sludge concentrator 11 and a screw press machine 31 as shown in FIG.
- the agglomeration reaction tank 1 can be connected to the sludge concentrator 11.
- the agglomeration reaction tank 1 is connected to a sludge tank 2 with a sewage supply passage 3 and a flocculant supply passage 4, and is provided with a stirring device 5.
- a flocculant is added to the wastewater wastewater, and the mixture is stirred and mixed.
- the sewage generates flocs by agglomeration reaction and becomes sludge.
- the sludge concentrator 11 is a gravity concentrator. Sludge flows down and is concentrated.
- the sludge lower passage 12 is provided obliquely forward and downward, with the rear upper end serving as an inlet 12a and the front lower end serving as an outlet 12b.
- An outlet of the sludge tank 2 of the agglomeration reaction tank 1 is connected to the inlet 12 a of the sludge lower passage 12.
- the sludge downflow passage 12 has a cross-sectional shape of a groove, and the bottom of the groove has a plate with a filtration hole.
- a liquid chamber 13 is provided below the sludge lower passage 12 to collect and discharge the liquid flowing down from the filtration hole of the bottom plate.
- a device for sweeping the bottom plate with the filter holes with a brush and controlling the speed at which the sludge flows down is provided on the sludge lower passage 12 with a baffle plate.
- a drive shaft 14 and a driven shaft 15 are provided on the inlet side and the outlet side on the sludge flow passage 12 along the left-right direction of the passage crossing direction.
- the drive shaft 14 is connected to the electric motor 16 through a transmission mechanism.
- the drive shaft 14 and the driven shaft 15 each have a chain wheel 17 fixed at the left and right positions.
- An endless chain 18 is stretched around the left wheel 17 of the drive shaft 14 and the driven shaft 15. Further, an endless chain 18 is also passed over the right side wheel 17 of the drive shaft 14 and the driven shaft 15.
- a baffle plate 19 is attached to the left and right chains 18 so as to extend in the left-right direction.
- the dam plate 19 protrudes the brush 20 on the tip side.
- a baffle plate 19 with a brush 20 protrudes outward in parallel at equal intervals. While the baffle plate 19 with the brush 20 is positioned below the chain 18 on both sides, the baffle plate 19 is fitted in the sludge flow lower passage 12 having a groove-shaped cross-sectional shape along the passage crossing direction. 20 contacts the bottom plate of the sludge flow passage 12.
- the baffle plate 19 with the brush 20 reaches the lower side of the chain 18 around the drive shaft 14, enters the inlet 12 a of the sludge lower passage 12, and fits into the sludge lower passage 12. While the damming plate 19 is fitted in the sludge flow passage 12, the brush 20 moves down the sludge flow passage 12 at a set speed while sweeping the bottom plate having the filtering holes.
- the baffle plate 19 with the brush 20 reaches the outlet 12b of the sludge flow passage 12
- the sludge flow passage 12 comes out of the sludge flow passage 12, turns around the driven shaft 15, and reaches the upper side of the chain 18.
- the sludge flowing down the sludge flow passage 12 flows down while being blocked by the baffle plate 19 with the brush 20 that moves down the sludge flow passage 12 at a set speed.
- the concentrated sludge flows out from the outlet 12b of the sludge down passage 12.
- the screw press machine 31 has a screw shaft 33 concentrically fitted in a horizontally disposed outer cylinder 32.
- the screw shaft 33 has a screw blade 33b spirally wound around the outer periphery of the rotary shaft 33a.
- the screw blade 33b wound spirally is cut at an axial intermediate portion 46 of the screw shaft. In the intermediate portion 46, the screw blade 33b is not provided on the outer periphery of the rotating shaft 33a.
- the end of the screw shaft 33 protrudes from the end of the outer cylinder 32 and is connected to the electric motor 34 via a transmission mechanism.
- a spiral transfer passage 35 is formed between the outer cylinder 32 and the bladed portion of the screw shaft 33.
- An inlet passage 36 is connected to the upper side of the sludge inlet side of the transfer passage 35.
- the inlet passage 36 has an upper end inlet connected to the outlet 12b of the sludge flow passage 12 of the sludge concentrator 11 via a rotary valve 37.
- a level sensor 38 is provided in the charging passage 36.
- a control device for the amount of sludge in the charging passage 36 is provided. This control device opens and closes the rotary valve 37 based on the sludge height in the input passage 36 detected by the level sensor 38, and adjusts the amount of the sludge concentrated by the sludge concentrator 11 into the input passage 36.
- the amount of sludge in the charging passage 36 is controlled within a preset range.
- the input passage 36 is provided with a direct heating device for blowing heated steam into the sludge.
- a direct heating device for blowing heated steam into the sludge.
- a direct heating device as shown in FIGS. 2 and 4, a plurality of blowing pipes 41 are arranged in the charging passage 36 along the axial direction of the screw shaft 33.
- the blowing pipe 41 is connected to a heating steam generation source (not shown) via a flow rate control valve 42.
- the sludge on the inlet side of the input passage 36 and the transfer passage 35 is directly heated by heating steam supplied from the injection pipe 41. Sludge temperature rises.
- the input passage 36 is provided with a device for controlling the temperature of the sludge that is directly heated.
- This temperature control device is provided with a temperature sensor 43 in the charging passage 36. Based on the sludge temperature detected by the temperature sensor 43, the opening degree of the flow rate control valve 42 is adjusted, the flow rate of the heated steam blown into the sludge from the blowing pipe 41 is increased and decreased, and the temperature of the directly heated sludge is preset. Control to the specified range.
- the rotary valve 37 prevents the water vapor in the charging passage 36 from flowing upward when closed.
- the charging passage 36 is provided with a flocculant addition device 45 for adding the flocculant to the sludge.
- the flocculant adding device 45 the auxiliary sludge is added to the concentrated sludge, and the flocculant reacts with the temperature rising. Sludge reagglomerates.
- the transfer passage 35 has a sludge inlet side portion as a temperature rise area and a sludge outlet side portion as a liquid separation area.
- the intermediate portion 46 is made non-filterable without a filtering hole, and the dropping port side portion is made filterable with a filtering hole.
- a drainage portion 39 that is sealed with water is provided at the lower portion of the inlet side portion, and the drainage portion 39 has a filterability with a filtration hole.
- spiral screw blades 33b wound around the outer periphery of the rotary shaft 33a have a uniform pitch.
- the bladed portion of the rotating shaft 33a has an outer diameter that is made uniform at the inlet side and expanded toward the outlet at the outlet side.
- the transfer passage 35 is a non-compressible passage where the cross-sectional area does not change in the temperature rise area of the inlet side portion, and a compressible passage where the cross-sectional area decreases toward the drop in the liquid separation area of the drop opening side portion. ing. Between the incompressible passage and the compressible passage, an intermediate portion 46, which is a region where the screw blades 33b do not exist, is provided.
- a liquid chamber 40 that collects and discharges the liquid flowing down from the filtration hole is provided under the filterable dropping port side portion of the outer cylinder 32.
- a passage 44 through which the dewatered cake pushed out while receiving resistance by the resistor falls is connected to the bottom of the transfer passage 35.
- a dehydration method for dewatering sludge concentrated by a concentrator using the dehydration apparatus will be described.
- sewage and a flocculant are supplied to the sludge tank 2 in the coagulation reaction tank 1.
- the sewage is agglomerated and becomes sludge.
- This sludge flows out from the outlet of the sludge tank 2 and flows into the inlet 12 a of the sludge downflow passage 12 of the sludge concentrator 11.
- the sludge flows down at a set speed and is concentrated while being dammed by the dam plate 19 with the brush 20 in the sludge flow passage 12.
- the concentrated sludge flows out from the outlet 12 b of the sludge flow down passage 12 and flows into the charging passage 36 of the screw press machine 31 through the rotary valve 37.
- the sludge that has flowed into the charging passage 36 is blown with heated steam from the blowing pipe 41 and flows down to the temperature rising area of the transfer passage 35. Direct heating increases the temperature. Further, the sludge is re-agglomerated by adding an auxiliary flocculant from the flocculant addition device 45 and being stirred by the rotation of the screw shaft 33.
- the state of sludge filling in the transfer passage 35 is shown in FIG.
- the hatched portion represents the sludge filling state
- the cross-hatched portion represents the sludge filling state in the intermediate portion 46.
- the sludge that has re-agglomerated due to the rise in temperature is transferred by the rotation of the screw shaft 33 through the transfer passage 35 from the temperature increase zone to the liquid separation zone via the intermediate portion 46 and compressed while the liquid separation zone is compressed toward the drop port. Is done. Since the screw blade 33b is cut in the intermediate portion 46, the sludge transferred to the intermediate portion 46 is compressed in the entire transfer passage 35 as shown by cross hatching.
- the sludge has a moisture content of about 99% by mass when flowing from the agglomeration reaction tank 1 into the sludge concentrator 11, and has a moisture content of 95% by mass when flowing from the sludge concentrator 11 into the screw press machine 31. Percentage. When it becomes a dehydrated cake, the water content is about 70% by mass.
- the temperature is normal temperature while flowing from the agglomeration reaction tank 1 through the sludge concentrator 11 into the screw press machine 31. In the screw press 31, the temperature is about 60 ° C. while being transferred while being compressed in the liquid separation section of the transfer passage 35.
- the sludge heating and dehydrating apparatus of this example includes a direct heating chamber 51 that directly heats sludge between the outlet of the sludge concentrator 11 and the charging passage 36 of the screw press machine 31.
- the direct heating chamber 51 is provided with a direct heating device for blowing heated steam into the sludge, and a sludge stirring device 49. Further, a flocculant addition device 45 is provided.
- the direct heating device has a blow pipe 41 connected to the direct heating chamber 51.
- the blowing pipe 41 is connected to a heated steam generation source via a flow rate control valve 42.
- the sludge in the direct heating chamber 51 is directly heated by heating steam supplied from the blowing pipe 41.
- a device for controlling the temperature of the sludge is provided.
- the temperature control device is provided with a temperature sensor 43 directly in the heating chamber 51. Based on the sludge temperature detected by the temperature sensor 43, the opening degree of the flow rate control valve 42 is adjusted, the flow rate of the heated steam blown into the sludge from the blowing pipe 41 is increased or decreased, and the sludge temperature is controlled within a set range.
- the sludge agitation device 49 is provided with a rotating shaft with a stirring piece directly in the heating chamber 51, and the rotating shaft is connected to an electric motor.
- the sludge in the heating chamber 51 is directly stirred by the rotation of the rotating shaft with the stirring piece.
- the flocculant addition device 45 directly adds the flocculant to the sludge in the heating chamber 51.
- the sludge in the direct heating chamber 51 is added with an auxiliary flocculant and undergoes a flocculation reaction in a state where the temperature is increased.
- a rotary valve 50 is provided between the inlet of the direct heating chamber 51 and the outlet of the sludge concentrator 11.
- the rotary valve 50 controls the amount of sludge that enters the heating chamber 51 directly from the sludge concentrator 11. When closed, the heated steam in the direct heating chamber 51 is prevented from flowing upward.
- a rotary valve 52 is provided between the outlet of the direct heating chamber 51 and the charging passage 36 of the screw press 31. The rotary valve 52 controls the amount of sludge that enters the screw press 31 directly from the heating chamber 51. When closed, the water vapor in the heating chamber 51 is prevented from flowing downward.
- the rotary valve 52 can be omitted.
- the screw press machine 31 is not provided with a direct heating device, a sludge stirring device or a flocculant addition device in the charging passage 36 or the transfer passage 35.
- the transfer passage 35 is provided with an intermediate portion 46 which is a region where the screw blades 33b do not exist.
- the outer cylinder 32 is filterable with the entire length having a filter hole except for the intermediate portion 46.
- the full length of the winged part of the rotating shaft is enlarged as the outer diameter goes to the drop port.
- the transfer passage 35 is a compressible passage whose cross-sectional area decreases as the total length goes toward the dropping port.
- the sludge concentrated by the sludge concentrator 11 is directly supplied to the heating chamber 51.
- heated steam is blown into the sludge and the sludge is stirred.
- a flocculant is added to the sludge.
- the sludge in the direct heating chamber 51 rises in temperature and reaggregates.
- This sludge is supplied to the screw press machine 31 in a state where the liquid is easily separated from the solid, and dehydrated by the screw press machine 31.
- Other points are the same as in the first example.
- the same parts as those in the first example are denoted by the same reference numerals as those in the first example.
- the sludge concentrator 11 is a gravity concentrator, but other concentrators are used.
- the heat source for directly heating the sludge is heated steam, but other steam or hot air is used.
- the screw press machine 31 is provided with a closing device that temporarily closes the passage between the temperature rise zone and the liquid separation zone of the transfer passage 35. The closing device temporarily closes when the screw press 31 is started in a state where there is no sludge in the transfer passage 35. Then, sludge tends to accumulate in the temperature rise area of the transfer passage 35. Further, it is possible to prevent the heated steam in the temperature rising zone of the transfer passage 35 from flowing out to the liquid separation zone.
- the present invention can be used for dewatering treatment of domestic wastewater and industrial wastewater.
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Abstract
Description
汚泥は、汚泥濃縮機で濃縮し、スクリュープレスで脱水する脱水処理において、図1に例示するように、汚泥の直接加熱は、汚泥を汚泥濃縮機で濃縮した後であって、スクリュープレス機で脱水する前に行なうことにした。特に、スクリュープレス機で脱水する直前に行なうことにした。
汚泥は、汚泥濃縮機で液体を分離した後には、分離した液体の分、容積ないし流量が減少し、加熱する熱の消費量が少なくて済む。また、加熱された汚泥は、全部がスクリュープレス機で脱水され、熱の損失がない。加熱効率が高い。脱水効率が高い。
また、汚泥濃縮機で濃縮した汚泥は、直接加熱する際、凝集剤を添加して凝集することにした。凝集反応は、温度が上昇した状態で、良好に行なわれる。脱水効率が更に高くなる。 The method of
In the dehydration process in which sludge is concentrated with a sludge concentrator and dehydrated with a screw press, as illustrated in FIG. 1, direct heating of sludge is after the sludge is concentrated with a sludge concentrator, We decided to do it before dehydration. In particular, it was decided to carry out immediately before dehydration with a screw press.
After the liquid is separated by the sludge concentrator, the volume or flow rate is reduced by the amount of the separated liquid, and the consumption of heat to be heated is small. Moreover, the heated sludge is all dehydrated with a screw press and there is no heat loss. High heating efficiency. High dehydration efficiency.
Moreover, when the sludge concentrated by the sludge concentrator is directly heated, a flocculant is added to agglomerate. The agglutination reaction is favorably performed with the temperature raised. Dehydration efficiency is further increased.
第1具体例
上記原理を利用する第1例は、汚泥濃縮機とスクリュープレス機との間に、汚泥を直接加熱する直接加熱室を設ける。直接加熱室は、汚泥に蒸気や熱風を吹き込む直接加熱装置を設ける。また、汚泥を撹絆する装置を設ける。
濃縮機で濃縮した汚泥は、直接加熱室に供給する。直接加熱室では、汚泥に蒸気や熱風を吹き込み、汚泥を撹絆する。直接加熱室の汚泥は、加熱されて温度が上昇し、含有する液体の粘度が低下する。液体が固体から分離し易くなる。この汚泥は、スクリュープレス機に供給し、スクリュープレス機で脱水する。
また、直接加熱室は、汚泥に凝集剤を添加する装置を設ける。汚泥の凝集反応は、温度が上昇した状態で、良好に行なわれる。スクリュープレスでの脱水効率が更に高くなる。 Specific examples based on the above idea include the following specific examples.
First Specific Example In a first example using the above principle, a direct heating chamber for directly heating sludge is provided between a sludge concentrator and a screw press. The direct heating chamber is provided with a direct heating device that blows steam or hot air into the sludge. In addition, a device for stirring sludge is provided.
The sludge concentrated by the concentrator is supplied directly to the heating chamber. In the direct heating chamber, steam or hot air is blown into the sludge and the sludge is stirred. The sludge in the direct heating chamber is heated and the temperature rises, and the viscosity of the liquid contained decreases. The liquid is easily separated from the solid. This sludge is supplied to a screw press and dehydrated with a screw press.
The direct heating chamber is provided with a device for adding a flocculant to the sludge. The sludge agglomeration reaction is carried out satisfactorily with the temperature raised. Dehydration efficiency with a screw press is further increased.
第2例は、第1例における直接加熱室をスクリュープレス機の投入口部分に組み込む。スクリュープレス機は、外筒とスクリュー軸との間の螺旋状の移送通路に投入通路を接続している。投入通路と移送通路の投入口側部分を直接加熱室にする。投入通路には、汚泥に蒸気や熱風を吹き込む直接加熱装置を設ける。スクリュー軸の投入口側部分には、撹拌片を設ける。移送通路の投入口側部分には、スクリュー軸と一緒に回転する撹拌片で汚泥を撹拌する撹拌装置を構成する。
汚泥濃縮機で濃縮した汚泥は、スクリュープレスの投入通路に供給する。この汚泥は、投入通路と移送通路の投入口側部分を順次通過する。その際、水蒸気や熱風が吹き込まれ、撹拌片で撹拌される。直接加熱されて温度が上昇し、液体が固体から分離し易くなる。この汚泥は、移送通路を圧縮されつつ移送され、脱水される。
第2例は、装置がコンパクトになる。汚泥は、直接加熱を脱水の直前に行なう。汚泥の直接加熱と脱水との間の時間と距離が短くなる。熱の損失が少なくなる。
また、投入通路は、汚泥に凝集剤を添加する装置を設ける。汚泥の凝集反応は、温度が上昇した状態で、良好に行なわれる。 Second Specific Example In the second example, the direct heating chamber in the first example is incorporated in the inlet portion of the screw press machine. The screw press machine has a charging passage connected to a spiral transfer passage between an outer cylinder and a screw shaft. The inlet side portion of the input passage and the transfer passage is directly used as a heating chamber. A direct heating device for blowing steam or hot air into the sludge is provided in the input passage. A stirring piece is provided on the inlet side of the screw shaft. A stirring device that stirs sludge with a stirring piece that rotates together with the screw shaft is formed in the inlet side portion of the transfer passage.
The sludge concentrated by the sludge concentrator is supplied to the input passage of the screw press. This sludge sequentially passes through the input passage and the transfer port side portion of the transfer passage. At that time, steam or hot air is blown in and stirred with a stirring piece. Direct heating increases the temperature and facilitates separation of the liquid from the solid. This sludge is transferred while being compressed in the transfer passage and dehydrated.
In the second example, the device becomes compact. Sludge is directly heated immediately before dehydration. The time and distance between direct heating and dewatering of the sludge is shortened. Less heat loss.
The introduction passage is provided with a device for adding a flocculant to the sludge. The sludge agglomeration reaction is carried out satisfactorily with the temperature raised.
本発明はこのような問題に対処するためになされたものであり、スクリュープレス機内での脱水を十分に行なうことができる脱水処理方法および脱水処理装置の提供を目的とする。 The present invention further develops a sludge dewatering treatment method and a dewatering treatment device in which sludge is directly heated by a sludge concentrator and before dewatering by a screw press. . When the state of sludge in the transfer passage of the screw press machine was examined in detail, uneven distribution of sludge was found in the transfer passage. If sludge is unevenly distributed, heat loss may occur or dehydration in the screw press machine may not be sufficient.
The present invention has been made to address such problems, and an object of the present invention is to provide a dehydration processing method and a dehydration processing apparatus that can sufficiently perform dehydration in a screw press.
上記スクリュープレス機は、スクリュー軸の中間部分の軸方向所定長さにわたって、スクリュー軸を構成する回転軸の外周にスクリュー羽根が設けられていないスクリュープレス機である。
上記濃縮された汚泥は、上記スクリュープレス機を構成する移送通路の汚泥投入口側において加熱水蒸気または熱風により直接加熱され、上記スクリュープレス機内において上記汚泥が加熱された状態で脱水されることを特徴とする。
また、上記濃縮された汚泥は、直接加熱されるときに、汚泥凝集剤を添加して凝集させることを特徴とする。 The sludge dewatering method of the present invention is a method of dewatering sludge concentrated by a sludge concentrator using a screw press.
The screw press machine is a screw press machine in which screw blades are not provided on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of an intermediate portion of the screw shaft.
The concentrated sludge is directly heated by heated steam or hot air on the sludge inlet side of the transfer passage constituting the screw press machine, and dehydrated in the state where the sludge is heated in the screw press machine. And
Further, the concentrated sludge is characterized by adding a sludge flocculant when it is directly heated.
上記汚泥濃縮機は斜面を汚泥が流れ下ることにより濃縮される重力濃縮機である。また、上記スクリュープレス機は、スクリュー軸の中間部分の軸方向所定長さにわたって、スクリュー軸の外周にスクリュー羽根が設けられておらず、上記スクリュープレス機を構成する移送通路の汚泥投入口側に上記移送通路と一体になって上記濃縮された汚泥を直接加熱する投入通路が設けられ、この投入通路に加熱水蒸気や熱風を吹き込むための手段を有することを特徴とする。
また、上記脱水処理装置の投入通路は、さらに上記濃縮された汚泥に凝集剤を添加する手段を有することを特徴とする。 The dewatering apparatus of the present invention is used in the sludge dewatering method, and includes a sludge concentrator for concentrating sludge and a screw press for dewatering the concentrated sludge.
The sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down a slope. Further, the screw press machine is provided with no screw blades on the outer periphery of the screw shaft over a predetermined length in the axial direction of the middle portion of the screw shaft, and on the sludge inlet side of the transfer passage constituting the screw press machine. An input passage for directly heating the concentrated sludge is provided integrally with the transfer passage, and means for blowing heated steam or hot air into the input passage is provided.
Further, the input passage of the dehydration apparatus further has means for adding a flocculant to the concentrated sludge.
上記汚泥濃縮機は斜面を汚泥が流れ下ることにより濃縮される重力濃縮機であり、
上記スクリュープレス機は、上記スクリュー軸の中間部分の軸方向所定長さにわたって、スクリュー軸を構成する回転軸の外周にスクリュー羽根が設けられておらず、上記スクリュープレス機を構成する移送通路の汚泥投入口側に接続される直接加熱室が設けられ、この直接加熱室は、上記濃縮された汚泥を攪拌する攪拌手段および加熱水蒸気や熱風を吹き込むための手段を有することを特徴とする。
また、上記攪拌手段は、上記スクリュー軸と一緒に回転する撹拌片で汚泥を撹拌する撹拌装置であることを特徴とする。 Another dehydration apparatus of the present invention includes a sludge concentrator that concentrates sludge and a screw press machine that dehydrates the concentrated sludge.
The sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down the slope,
In the screw press machine, the screw blade is not provided on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of the intermediate portion of the screw shaft, and sludge in the transfer passage constituting the screw press machine is provided. A direct heating chamber connected to the inlet side is provided, and this direct heating chamber has a stirring means for stirring the concentrated sludge and a means for blowing heated steam and hot air.
Further, the stirring means is a stirring device that stirs sludge with a stirring piece that rotates together with the screw shaft.
本例では、図1と図2に示すように、凝集反応槽1で凝集した汚泥は、汚泥濃縮機11で濃縮し、スクリュープレス機31において直接加熱して脱水する。 First embodiment (see FIGS. 1 to 5)
In this example, as shown in FIG. 1 and FIG. 2, the sludge aggregated in the aggregation reaction tank 1 is concentrated by the
汚泥流下通路12は、横断面形状を溝形にし、その溝形の底板を濾過孔のある板にしている。汚泥流下通路12の下には、底板の濾過孔から流れ落ちる液体を集めて排出する液体室13を設けている。 As shown in FIGS. 2 and 3, the
The
せき止め板19は、汚泥流下通路12に嵌合した状態で、ブラシ20が濾過孔のある底板を掃きながら汚泥流下通路12を設定速度で下る。ブラシ20付きのせき止め板19は、汚泥流下通路12の出口12bに達すると、汚泥流下通路12から抜け出し、従動軸15を回って鎖18の上側に至る。汚泥流下通路12を流れ下る汚泥は、汚泥流下通路12を設定速度で下るブラシ20付きのせき止め板19でせき止められつつ流れ下る。汚泥流下通路12の出口12bから濃縮汚泥が流れ出る。 When the
While the damming
螺旋状に巻き付けられているスクリュー羽根33bは、スクリュー軸の軸方向中間部分46で切断されている。この中間部分46ではスクリュー羽根33bが回転軸33aの外周に設けられていない。
スクリュー軸33の端は、外筒32の端から突出し、伝動機構を介して電動機34に連結している。外筒32とスクリュー軸33の羽根付き部分との間には、螺旋状の移送通路35を形成している。移送通路35の汚泥投入口側部分には、その上側位置に投入通路36を接続している。 As shown in FIG. 2, the
The
The end of the
また、投入通路36には、汚泥に凝集剤を添加する凝集剤添加装置45を設けている。この凝集剤添加装置45により、濃縮汚泥はに補助の凝集剤が添加され、温度が上昇した状態で凝集反応する。汚泥が再凝集する。 The
Further, the charging
なお、移送通路35の温度上昇区域に、スクリュー軸33と一緒に回転する撹拌片を設けて汚泥を撹拌してもよい。
スクリュー軸33は、回転軸33a外周に巻き付いた螺旋状のスクリュー羽根33bを均等ピッチにしている。その回転軸33aの羽根付き部分は、外径を、投入口側部分で均等にし、落下口側部分で落下口に向うに従って拡大している。
移送通路35は、投入口側部分の温度上昇区域では断面積が変化しない非圧縮性の通路にし、落下口側部分の液体分離区域では落下ロに向うに従って断面積が減少する圧縮性の通路にしている。この非圧縮性の通路と、圧縮性の通路との間にはスクリュー羽根33bが存在していない領域である中間部分46を設けている。 The
In addition, you may provide the stirring piece which rotates with the
In the
The
上記脱水処理装置を使用して汚泥の加熱脱水方法を実施する場合、凝集反応槽1において、汚泥槽2に汚水と凝集剤を供給する。汚水は、凝集反応して、汚泥になる。この汚泥は、汚泥槽2の出口から流出し、汚泥濃縮機11の汚泥流下通路12の入口12aに流入する。 A dehydration method for dewatering sludge concentrated by a concentrator using the dehydration apparatus will be described.
When the sludge heat dehydration method is carried out using the dehydration apparatus, sewage and a flocculant are supplied to the
温度が上昇して再凝集した汚泥は、スクリュー軸33の回転で、移送通路35を温度上昇区域から中間部分46を経て液体分離区域に送られ液体分離区域を落下口に向けて圧縮されつつ移送される。
中間部分46はスクリュー羽根33bが切断されているので、中間部分46に移送された汚泥は、クロスハッチングで示したように、移送通路35全体に圧縮される。この中間部分を設けることで、(1)温度が上昇して再凝集した汚泥の加熱状態を維持できる、(2)投入通路36に吹き込まれた加熱水蒸気が移送通路35を経て抜けるのを防げるので、全体としての熱効率を向上できる。
移送通路35の液体分離区域で脱水された汚泥は、脱水ケーキになり、ケーキ落下のための通路44を落下する。 The state of sludge filling in the
The sludge that has re-agglomerated due to the rise in temperature is transferred by the rotation of the
Since the
The sludge dehydrated in the liquid separation area of the
本例の汚泥加熱脱水装置は、図6に示すように、汚泥濃縮機11の出口とスクリュープレス機31の投入通路36との間に、汚泥を直接加熱する直接加熱室51を設けている。直接加熱室51は、汚泥に加熱水蒸気を吹き込む直接加熱装置と、汚泥撹拌装置49とを設けている。また、凝集剤添加装置45を設けている。 Second embodiment (see FIG. 6)
As shown in FIG. 6, the sludge heating and dehydrating apparatus of this example includes a
凝集剤添加装置45は、直接加熱室51の汚泥に凝集剤を添加する。直接加熱室51の汚泥は、補助の凝集剤が添加され、温度が上昇した状態で凝集反応する。 The
The
その他の点は、第1例におけるのと同様である。第1例におけるのと同様な部分には、図中第1例におけるのと同一の符号を付ける。 In the sludge heating and dehydrating method of this example, the sludge concentrated by the
Other points are the same as in the first example. The same parts as those in the first example are denoted by the same reference numerals as those in the first example.
1.上記の実施形態において、汚泥濃縮機11は、重力濃縮機であるが、その他の濃縮機にする。
2.上記の実施形態において、汚泥を直接加熱する熱源は、加熱水蒸気であるが、その他の蒸気または熱風にする。
3.上記の実施形態の第1例において、スクリュープレス機31は、移送通路35の温度上昇区域と液体分離区域の間に、通路を一時的に閉鎖する閉鎖装置を設ける。この閉鎖装置は、移送通路35に汚泥がない状態でスクリュープレス31を始動する際、一時的に閉鎖作動する。すると、汚泥が移送通路35の温度上昇区域に溜まり易い。また、移送通路35の温度上昇区域の加熱水蒸気が液体分離区域に流出するのが防止される。 [Modification]
1. In the above embodiment, the
2. In the above embodiment, the heat source for directly heating the sludge is heated steam, but other steam or hot air is used.
3. In the first example of the above-described embodiment, the
2 汚泥槽
3 汚水供給通路
4 凝集剤供給通路
5 捜拝装置撹拌装置
11 汚泥濃縮機
12 汚泥流下通路
13 液体室
14 駆動軸
15 従動軸
16 電動機
17 鎖車
18 鎖
19 せき止め板
20 ブラシ
31 スクリュープレス機
32 外筒
33 スクリュー軸
34 電動機
35 移送通路
36 投入通路
37 回転弁
38 レベルセンサ
39 水抜き部
40 液体室
41 水蒸気の吹込み管
42 流量制御弁
43 温度センサ
44 通路
45 凝集剤添加装置
46 中間部分
49 汚泥撹拌装置
50 回転弁
51 直接加熱室
52 回転弁 DESCRIPTION OF SYMBOLS 1
Claims (6)
- 回転軸の外周にスクリュー羽根を螺旋状に巻き付けたスクリュー軸を有するスクリュープレス機を用いて、濃縮機で濃縮された汚泥を脱水する汚泥の脱水処理方法であって、
前記スクリュープレス機は、前記スクリュー軸の軸方向中間部分に前記スクリュー羽根が設けられていないスクリュープレス機であり、
前記濃縮された汚泥は、前記スクリュープレス機を構成する移送通路の汚泥投入口側において加熱水蒸気および/または熱風により直接加熱され、前記スクリュープレス機内において前記汚泥が加熱された状態で脱水されることを特徴とする汚泥の脱水処理方法。 A sludge dewatering method for dewatering sludge concentrated by a concentrator using a screw press machine having a screw shaft spirally wound around the outer periphery of a rotating shaft,
The screw press machine is a screw press machine in which the screw blade is not provided in the axial direction intermediate portion of the screw shaft,
The concentrated sludge is directly heated by heated steam and / or hot air on the sludge inlet side of the transfer passage constituting the screw press machine, and dehydrated while the sludge is heated in the screw press machine. A method for dewatering sludge. - 前記濃縮された汚泥は、直接加熱されるときに、汚泥凝集剤を添加して凝集させることを特徴とする請求項1記載の脱水処理方法。 The dewatering method according to claim 1, wherein when the concentrated sludge is directly heated, a sludge flocculant is added to cause aggregation.
- 請求項1記載の汚泥の脱水処理方法に用いる脱水処理装置であって、
前記脱水処理装置は、汚泥を濃縮する汚泥濃縮機と、濃縮された汚泥を脱水するスクリュープレス機とを備え、
前記汚泥濃縮機は斜面を汚泥が流れ下ることにより濃縮される重力濃縮機であり、
前記スクリュープレス機は、前記スクリュー軸の中間部分の軸方向所定長さにわたって、スクリュー軸を構成する回転軸の外周にスクリュー羽根が設けられておらず、前記スクリュープレス機を構成する移送通路の汚泥投入口側に前記移送通路と一体になって前記濃縮された汚泥を直接加熱する投入通路が設けられ、この投入通路に加熱水蒸気および/または熱風を吹き込むための手段を有することを特徴とする脱水処理装置。 A dewatering apparatus for use in the sludge dewatering method according to claim 1,
The dehydration apparatus includes a sludge concentrator that concentrates sludge, and a screw press machine that dehydrates the concentrated sludge,
The sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down the slope,
The screw press machine is provided with no screw blades on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of the intermediate portion of the screw shaft, and sludge in the transfer passage constituting the screw press machine. A dehydrating system characterized in that a charging passage that directly heats the concentrated sludge is provided integrally with the transfer passage on the charging port side, and has means for blowing heated steam and / or hot air into the charging passage. Processing equipment. - 前記投入通路は、さらに前記濃縮された汚泥に凝集剤を添加する手段を有することを特徴とする請求項3記載の脱水処理装置。 The dewatering apparatus according to claim 3, wherein the charging passage further includes means for adding a flocculant to the concentrated sludge.
- 請求項1記載の汚泥の脱水処理方法に用いる脱水処理装置であって、
前記脱水処理装置は、汚泥を濃縮する汚泥濃縮機と、濃縮された汚泥を脱水するスクリュープレス機とを備え、
前記汚泥濃縮機は斜面を汚泥が流れ下ることにより濃縮される重力濃縮機であり、
前記スクリュープレス機は、前記スクリュー軸の中間部分の軸方向所定長さにわたって、スクリュー軸を構成する回転軸の外周にスクリュー羽根が設けられておらず、前記スクリュープレス機を構成する移送通路の汚泥投入口側に接続される直接加熱室が設けられ、この直接加熱室は、前記濃縮された汚泥を撹拌する撹拌手段および加熱水蒸気および/または熱風を吹き込むための手段を有することを特徴とする脱水処理装置。 A dewatering apparatus for use in the sludge dewatering method according to claim 1,
The dehydration apparatus includes a sludge concentrator that concentrates sludge, and a screw press machine that dehydrates the concentrated sludge,
The sludge concentrator is a gravity concentrator that is concentrated by sludge flowing down the slope,
The screw press machine is provided with no screw blades on the outer periphery of the rotary shaft constituting the screw shaft over a predetermined length in the axial direction of the intermediate portion of the screw shaft, and sludge in the transfer passage constituting the screw press machine. A direct heating chamber connected to the inlet side is provided, and the direct heating chamber has a stirring means for stirring the concentrated sludge and a means for blowing heated steam and / or hot air. Processing equipment. - 前記撹拌手段は、前記スクリュー軸と連動して回転する撹拌片で汚泥を撹拌する撹拌装置であることを特徴とする請求項5記載の脱水処理装置。 6. The dehydrating apparatus according to claim 5, wherein the stirring means is a stirring device that stirs sludge with a stirring piece that rotates in conjunction with the screw shaft.
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- 2012-09-11 CN CN201280075746.8A patent/CN104619654B/en not_active Expired - Fee Related
- 2012-09-11 WO PCT/JP2012/073155 patent/WO2014041594A1/en active Application Filing
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JP2016203059A (en) * | 2015-04-17 | 2016-12-08 | 日本アルシー株式会社 | Sludge pretreatment apparatus, sludge thickening apparatus and sludge thickening method |
KR102643959B1 (en) | 2023-09-01 | 2024-03-08 | 디와이산업개발 주식회사 | Method for dehydrating organic sludge |
KR102637663B1 (en) | 2023-11-28 | 2024-02-19 | 디와이산업개발 주식회사 | Method for dehydrating concentrated sludge |
Also Published As
Publication number | Publication date |
---|---|
JP5968449B2 (en) | 2016-08-10 |
CN104619654B (en) | 2016-10-26 |
CN104619654A (en) | 2015-05-13 |
KR20150053993A (en) | 2015-05-19 |
KR101960134B1 (en) | 2019-03-19 |
JPWO2014041594A1 (en) | 2016-08-12 |
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