JP2007181821A - Sludge treatment method and apparatus in water purification plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge treatment technology in a water purification plant which basically comprises bagging dehydration which is simple and free from a risk of secondary pollution. <P>SOLUTION: In a water purification plant mainly comprising a treatment tank 1, a settling tank 3 at a starting end, an intermediate tank 4, and a plurality of filter tanks 5 charged with a contact filter medium 9 are installed sequentially from the upstream side, and polluted water is purified while it flows toward the downstream side. A dehydration and volume reduction facility 10 based on the bagging dehydration is installed above the settling tank 3. Sludge M accumulated in the settling tank 3 is fed under pressure by a pump 13 to the dehydration and volume reduction facility 10, and then bagged to be dehydrated and volume-reduced. Generated sewage is returned to the settling tank 3 to be repurified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for treating sludge in a water purification facility for the purpose of purifying polluted water in rivers and lakes or industrial wastewater, and in particular, for the purpose of reducing the volume of sludge left after purification of pollutants. The present invention relates to a processing method and a processing apparatus.

  In sewerage sewage treatment plants, which are typical water purification facilities, agglomeration is performed by a coagulation sedimentation method (a method in which suspended fine particles are separated and settled using a coagulant) as a measure to reduce the volume of sludge generated. A method of reducing the volume by applying sludge to the large dehydrator is widely adopted.

  On the other hand, water purification facilities in rivers and lakes rarely use the same coagulation sedimentation method as sewage treatment plants, but generally the pollution load per unit treated water is small (approximately sewerage treatment plants). Since the amount of sludge generated is small and the coagulation sedimentation method is wasteful and expensive, the residual sludge is naturally concentrated and used as industrial waste at the final disposal site. Often disposed of. In other words, in water purification facilities in rivers and lakes, the generated sludge is temporarily stored in pits and naturally concentrated, and then periodically transported to a final disposal site by a vacuum vehicle or the like and disposed as industrial waste.

Although it is not a sludge treatment technology for water purification facilities in rivers and lakes, for example, the technology described in Patent Literature 1 as a technology for purifying seabed sediments, and the technology described in Patent Literature 2 as a treatment method for sludge. Each has been proposed.
JP 2005-262174 A Japanese Patent Publication No. 6-77759

However, in water purification facilities in rivers and lakes, the unit mass of generated sludge and water is almost the same.For example, when concentrated sludge accumulated in the bottom layer of a treatment facility is sucked with a vacuum vehicle, the sludge The concentration is about 1 to 2% (unit deposition weight at this time is about 1.0 t / m ³ ). Therefore, even though it is concentrated sludge, its concentration naturally has its limit, and the sludge is sucked together with a large amount of water with a vacuum car and processed as industrial waste, which is inevitably wasteful. Because of the high cost, there is a demand for further sludge volume reduction measures.

  In addition, the technologies described in Patent Documents 1 and 2 are all technologies related to volume reduction of sludge based on so-called bagging dehydration, but in the treatment of water after dehydration treatment, in which secondary generation is unavoidable. Not enough attention has been given to the possibility of cross-contamination, leaving room for further improvement.

  The present invention has been made paying attention to such problems, and intends to provide a sludge volume reduction technology based on bagging and dewatering suitable for water purification facilities in rivers and lakes with relatively small pollution loads. More specifically, an object of the present invention is to provide a sludge treatment method and a treatment apparatus that are simple and free from worries about secondary contamination.

  The invention according to claim 1 is a treatment method of sludge generated in a water purification facility that purifies the quality of polluted water using a contact filter medium, wherein the sludge accumulated in the water purification facility is made of a woven or non-woven filter bag. The water contained in the sludge is permeated through the filtration bag, and the permeated water is returned to the water purification facility for re-purification. The volume is reduced by 40 to 90% by volume.

  In addition, as the said contact filter medium, what is generally used widely may be used, for example, a gravel, a string-like thing, or a plastic type thing is used. In addition, BOD, COD, SS, nitrogen, phosphorus, etc. are assumed as the pollutants to be purified, and sludge generated at the purification facility is mainly organic, but inorganic sludge such as sand and mud is also used. Needless to say, it is included.

  In this case, when allowing the water contained in the sludge charged into the filter bag to permeate through the filter bag, the sludge-filtered bag is suspended and the weight of the sludge is filtered in the filter bag as described in claim 2. Acting as a pressure is effective in increasing the filtration efficiency or dewatering efficiency compared to, for example, laying the filter bag and leaving it naturally, especially when the longitudinal direction of the filter bag is suspended vertically, When the length of the filter bag is made larger than its diameter, the tendency becomes more remarkable.

  In addition, as described in claim 3, the filter bag filled with sludge is disposed at a higher level than the water surface level of the water purification facility, and the water that has permeated the filter bag is returned to the water purification facility under natural flow. It is desirable for simplification of equipment.

  On the other hand, in order to further promote the natural sedimentation of pollutants, the flow velocity at the contact portion with the filter medium is made smaller than the flow velocity at the surface layer portion of the flow, and the flow velocity at the portion near the bottom of the filter medium in the contact portion with the filter medium. For example, as described in claim 4, a water channel is formed from the inflow side of the water purification facility into which the polluted water is taken toward the discharge side from which the purified water is discharged to the outside. In addition to the lower permeation partition plate that allows water to flow only at the bottom layer while blocking the flow of water, the upper overflow partition plate that blocks water flow and flows only at the surface layer while blocking water flow is alternately arranged in the flow direction. A contact water channel is formed by loading a contact filter medium into a space defined by the lower permeation partition plate and the upper overflow partition plate. In addition, the overflow speed when water overflows the upper overflow partition plate is set to be larger than the contact flow speed that passes while contacting the contact filter medium in the contact water channel.

  The invention according to claim 5 captures the technology according to claim 1 as a treatment device, and treats sludge generated in a water purification facility that purifies the quality of polluted water using a contact filter medium. The apparatus is equipped with a dewatering means for allowing the sludge accumulated in the water purification facility to enter a woven or non-woven filter bag and permeate the water contained in the sludge from the filter bag. On the other hand, the amount of sludge after water permeation is reduced by 40 to 90% by volume with respect to the amount of sludge charged into the filter bag.

  In this case, for the same reason as the invention described in claim 2, as described in claim 6, in the dehydrating means, when the water contained in the sludge charged into the filter bag is permeated through the filter bag, the sludge is removed. It is desirable to suspend the input filter bag so that the sludge weight acts as a filter pressure on the filter bag.

  In addition, as described in claim 7, in the dewatering means, the filter bag into which the sludge has been placed is disposed higher than the water surface level of the water purification facility, and the water that has permeated through the filter bag is purified under natural flow. Returning to the facility is desirable in terms of simplifying the facility.

  Furthermore, for the same reason as that of the invention described in claim 4, as described in claim 8, a water channel is provided from the inflow side of the water purification facility into which the polluted water is taken toward the discharge side where the purified water is discharged to the outside. In the water channel, the lower permeation partition plate that allows water to flow only at the bottom layer while blocking the flow of water, and the upper overflow partition plate that allows water to flow only at the surface layer while blocking the flow of water. While being alternately arranged in the direction, a contact water channel is formed by loading a contact filter medium in a space defined by the lower permeation partition plate and the upper overflow partition plate. In addition, it is assumed that the overflow speed when water overflows the upper overflow partition plate is set to be larger than the contact flow speed that passes while contacting the contact filter medium in the contact water channel.

  Here, in order to facilitate the collection of sludge in the water purification facility, as described in claim 9, at least a part of the contact water channel portion is provided with an intermediate bottom that allows sludge to permeate downward. Thus, it is desirable that the structure has a double bottom structure, and the sludge accumulated in the lower space of the intermediate bottom is sucked up by a pump or the like and put into the filter bag.

  In that case, as described in claim 10, the lower space of the intermediate bottom is partitioned into a plurality of regions in the flow direction with a movable partition wall, and the partition wall is opened to operate the plurality of the plurality of regions. It is desirable to improve the sludge recovery efficiency that the areas can communicate with each other.

  Therefore, in the invention according to at least claim 1, in a facility for purifying polluted water such as a river or a lake, for example, a dewatering unit based on a so-called bagging dewatering system is installed at the upper part of the water purification facility, The sludge that settles and accumulates at the bottom of the purification facility is sucked up by a pump or the like and pumped to the dewatering unit. In the dewatering unit, the sludge is put into a filter bag made of woven fabric or non-woven fabric and left naturally for a predetermined period. Thereby, the water contained in the bagged sludge permeate | transmits a filtration bag, and the dehydration process of sludge is performed. And although it will also depend on a leaving period, the sludge in a filter bag is a predetermined ratio with respect to the amount of excess sludge initially thrown into the filter bag, for example, 40 to 90% by volume, Desirably 70% or more. Volume reduction is made. The sludge thus reduced in volume is transported to the final disposal site and disposed as industrial waste, or is effectively used in, for example, green farmland.

  According to the first and fifth aspects of the invention, the volume of sludge can be reduced with simpler equipment, which is advantageous in terms of cost, and the water that has passed through the filter bag is returned to the water purification facility again. Since it is purified again, there is an effect that no secondary contamination by permeate occurs.

  According to the second and sixth aspects of the present invention, the permeation efficiency of water from the filtration bag or the dewatering efficiency of the sludge packed in the bag is performed by suspending the filtration bag and performing permeation or dehydration of the water contained in the sludge. Can be further improved.

  According to the third and seventh aspects of the present invention, the water that has permeated through the filter bag is returned to the water purification facility under natural flow, so there is no concern about secondary contamination by the permeated water. There is an advantage that the equipment for returning to the water purification facility can be greatly simplified.

  According to invention of Claim 4, 8, while making it the contact water channel part which used the lower osmosis | permeation partition plate and the upper overflow partition plate together, the flow of the water which contacts a contact filter medium in the contact water channel part Since it is smaller than the flow velocity at the surface layer part, there is an advantage that the collection of the pollutant by the contact filter medium and the sedimentation and deposition of sludge can be further promoted.

  According to the ninth aspect of the present invention, since the contact water channel portion has a so-called double bottom structure with an intermediate bottom, the sludge is deposited on the lower side of the contact filter medium, so that the accumulated sludge can be easily recovered. There is an advantage that can be done.

  According to the invention described in claim 10, even if the lower space of the intermediate bottom is partitioned into a plurality of regions in the flow direction with a movable partition wall, the plurality of regions can be opened by opening the partition wall. Since they can communicate with each other, there is an advantage that the accumulated sludge can be easily recovered in the same manner as described above.

  1 and 2 are diagrams showing an example of a treatment facility for purifying polluted water of a river as a more specific first embodiment of the present invention.

  This processing facility has a processing tank 1 installed near the river R or in a part of the river R as a main element, and the processing tank 1 is embedded so that the upper surface thereof is substantially flush with the ground. The contaminated water on the upstream side R1 of the river R is pumped up by the pump 2 or the like and taken into the start end of the treatment tank 1, while the water purified by passing through the treatment tank 1 is discharged from the end of the treatment tank 1. It will be discharged to the downstream side R2 of the river. In addition, although it is desirable to construct the treatment tank 1 itself with a concrete structure or steel structure having excellent strength, for example, a predetermined space is excavated to create a tank-like space, and an impermeable sheet therein May be used as the treatment tank 1.

  At both ends of the treatment tank 1, a start precipitation tank 3 and a termination precipitation tank 6 are prepared for the purpose of pretreatment or post treatment, and an intermediate tank 4 is provided adjacent to the start precipitation tank 3. Further, between the intermediate tank 4 and the terminal settling tank 6, a plurality of filtration tanks 5, 5.

  Then, the polluted water taken from the river R is temporarily retained in the starting sedimentation tank 3 to promote the sedimentation, separation and deposition of pollutants with relatively large specific gravity contained in the polluted water, and the starting sedimentation tank 3 The water that overflows flows into the adjacent intermediate tank 4. The intermediate tank 4 and the adjacent filter tank 5 are completely partitioned by a partition plate 7, and the polluted water sucked up by the pump 8 from the intermediate tank 4 flows into the first filter tank (also referred to as a contact tank) 5. Will do.

  The contaminated water sucked up by the pump 8 from the intermediate tank 4 flows into the first filtration tank 5 at a constant flow rate through the measuring tank 50 at all times.

  Between the intermediate tank 4 and the terminal settling tank 6, as in the third embodiment described later (see FIGS. 5 and 6), the lower permeation partition plate 17 and the upper overflow partition plate 16 are arranged along the flow direction. Are alternately arranged, and are thereby partitioned into a plurality of filtration tanks 5, 5. Each of the filtration tanks 5, 5... Is suspended and supported so that, for example, fibrous string-like or lace-like contact filter media 9 are densely packed. A water channel is formed.

  Therefore, the contaminated water that has flowed into the first filtration tank 5 passes through the space below the lower permeation partition plate 17 and flows into the adjacent filtration tank 5, while the contaminated water that has flowed into the adjacent filtration tank 5 By overflowing the upper side of the overflow partition plate 16 and flowing into the adjacent filtration tank 5 and repeating the lower permeation and the upper overflow between the plurality of filtration tanks 5, 5. In the contact water channel portion consisting of the filtration tanks 5, 5..., A gentle flow of polluted water in the vertical direction is generated, and simultaneously a flow from the upstream side to the downstream side is generated. Floating matter and sludge are collected by contacting the contact filter medium 9, and soluble dirt contained in the contaminated water is decomposed into microorganisms that adhere to and grow on the surface of the contact filter medium 9 by passing between the contact filter media 9. And purification of polluted water is promoted.

  Thereafter, the polluted water flows from the final filtration tank 5 to the final settling tank 6 in an overflowing manner, and the final settling tank 6 temporarily retains the polluted water in the same manner as the start settling tank 3 for further pollution. Further promote sedimentation, separation and deposition of materials.

  Then, the settled pollutant is left in the terminal sedimentation tank 6 and the purified water of the supernatant portion temporarily retained in the terminal sedimentation layer 6 is discharged to the downstream side R2 of the river R in the form of overflowing from the terminal sedimentation tank 6. Will be.

  Here, the sludge M accumulated in the starting sedimentation tank 3 and the final sedimentation tank 6 needs to be pumped up and disposed of regularly, for example, every few days to several weeks.

  Therefore, in the present embodiment, the dehydration and volume reduction facility 10 is installed on the starting sedimentation tank 3 as a dehydration means, and the dehydration and volume reduction processing is performed in the dehydration and volume reduction facility 10 prior to disposal of sludge and the like. It is supposed to be applied.

  In the dehydration and volume reduction facility 10, a treatment booth 11 having a water-permeable mesh-like flooring 12 (also serving as the upper lid of the start-end settling tank 3) is installed on the start-end settling tank 3. The sludge M accumulated in the final settling tank 6 is pumped up by the pumps 13 and 14 and pumped to the processing booth 11. In the processing booth 11, the sludge M is put into a filter bag 15 made of woven or non-woven fabric. For example, as shown in FIG. Thereby, the water contained in the sludge M packed in the bag passes through the filter bag 15, and the sludge M is dehydrated by a so-called bag-packed dehydration method, thereby promoting volume reduction. At the same time, the water that has passed through the filter bag 15 passes through the floor material 12 as it is, is returned to the starting sedimentation tank 3 below, and is subjected to water purification treatment again. Here, the amount of sludge M finally left in the filter bag 15 is left until the volume is reduced by 40% to 90%, preferably 70% or more, with respect to the amount of sludge initially charged in volume. Therefore, the volume should be reduced by so-called bagging dehydration. That is, the volume of sludge after volume reduction is 10 to 60%, preferably 30% or less of the volume of sludge charged into the filter bag 15.

  In this case, as shown in FIGS. 1 and 2, the weight of the upper filtration bag 15 acts as a filtration pressure on at least the lower filtration bag 15 by stacking the filtration bags 15 in a flat manner over a plurality of stages. As a result, the water permeation efficiency or dewatering efficiency is improved. Furthermore, another weight may be placed on the uppermost filter bag 15.

  In addition, although the sludge M thrown into the filtration bag 15 is an organic substance decomposed | disassembled by the microorganisms which mainly adhere and grow on the surface of the contact filter medium 9, it cannot be overemphasized that it contains inorganic substances, such as sand and mud. In heavy rain or flood, inorganic substances such as sand and mud contained in the polluted water on the upstream side R1 of the river R increase rapidly, and the sludge M contains a large amount of inorganic substances.

As the filter bag 15 made of woven fabric or non-woven fabric, for example, a filter fabric such as polypropylene, polyester (Tetron = registered trademark), nylon (registered trademark), vinylon, acrylic, saran, cotton or the like is used. The thickness of the filter cloth is, for example, about 0.15 mm to 4.0 mm, and a water permeability coefficient in the range of 1 ra 10 ⁻¹ to 1 ra 10 ⁻⁴ cm / sec is used. When this filter cloth is sewn into a cylindrical shape, one end of the cylinder is bound with a string or the like to form a filter bag 15, and if sludge M is charged to about 50 to 80% of the bag volume, the opening of the bag Tighten firmly. As a method of binding, in addition to a method of binding with a tough string or the like, a mechanical chuck or clamp may be used.

  The time required for sufficient water permeation or dehydration depends on the concentration of the sludge M, the properties of the contained particles, the water permeability of the filter cloth, the filtration capacity (force applied to the sludge through the filter bag 15), etc. The volume can be reduced to the required volume reduction in about 10 days.

In general, the permeability coefficient of the filter cloth is determined by the opening and thickness of the filter cloth, but the permeability coefficient of many easily available filter cloths is 1 ra 10 ^-1 cm / sec or less. Therefore, a filter cloth having a water permeability of 1 ra 10 ^-1 to 1 ra 10 ^-4 cm / sec as described above is used according to the properties of water contained in the target sludge M. However, in the process of water permeating through the filter cloth, the particles contained in the permeate adhere to the filter cloth, causing clogging over time, and as the amount of permeate decreases, suspended matter (SS) Min) Content will also decrease. For these reasons, the transmission time varies greatly depending on the combination of the above conditions.

  Here, an example of the filter cloth used for the filter bag 15 is shown in Table 1. FIG. 3 shows the change in the amount of sludge accompanying dewatering, that is, the relationship between the amount of sludge and the standing time.

  In addition, when the sludge M is introduced into the filtration bag 15 in the dehydration and volume reducing facility 10, water with turbidity is leached and there is a concern about re-elution of BOD or the like. However, as described above, dehydration is performed. Since the water generated in the volume reduction facility 10 is returned to the starting sedimentation tank 3 below as it is and repurified through a series of water purification processes together with the raw water, there is no problem.

  The sludge M that has become a cream or dehydrated cake by the dehydration and volume reduction process as described above is taken out from the filter bag 15 and mounted on, for example, a dump truck, or carried out in a pit or container capable of primary storage. Transfer and store, as soon as it reaches a certain amount, carry out the same unloading process. The used filter bag 15 is repeatedly used.

  In addition, the creamy or dehydrated cake-like sludge M that has been carried out is diverted as embankment or backfilling material after solidifying treatment such as cement treatment or drying in the sun, or when it contains a lot of organic matter. Diversion as organic fertilizer soil is also possible.

  As described above, according to the present embodiment, the sludge M generated in the water purification facility can be reduced in volume by being filtered or dehydrated by a very simple facility on the spot, and generated by dehydration. Since the filtered water is returned again to the water purification facility, not only does the problem of secondary contamination by filtered water not occur at all, but also water treatment equipment after dehydration is not particularly required.

  FIG. 4 is a diagram showing a second embodiment of the present invention. In the first embodiment, bagging and dewatering is performed in a so-called flat state in which a filtration bag 15 filled with sludge M is laid. On the other hand, in the second embodiment, the filtration bag 25 filled with the sludge M is suspended from the upper part and the bag is dewatered by a so-called suspension method. In addition, the same code | symbol is attached | subjected to the part which is common in previous 1st Embodiment.

  In the second embodiment, as shown in FIG. 4, the dehydration and volume reduction facility 20 is arranged offset to the upstream side from the starting sedimentation tank 3, while the impermeable floor plate 22 in the processing booth 21 is provided. It is made to incline so that it may become a downward slope toward the start end sedimentation tank 3 side. A plurality of filtration bags 25 packed with sludge M are suspended and supported from above in the processing booth 21 so that the longitudinal direction thereof is the vertical direction, and water contained in the sludge M in each filtration bag 25 is arranged. Permeation or dehydration.

  According to the second embodiment, the filtration bags 25 do not overlap with each other, and the sludge weight in the filtration bags 25 acts on the filtration bag 25 itself as the filtration pressure, so that the water filtration efficiency or dewatering efficiency is achieved. Will be improved. Moreover, the water which permeate | transmitted the filtration bag 25 will flow along the inclined floor board 22 under natural flow, and will be returned to the start end sedimentation tank 3 similarly to 1st Embodiment.

  What is common to these first and second embodiments is that both the dehydration and volume reduction facility 10 or 20 are arranged above the water level of the water purification facility. As described above, since the dewatered sewage is returned to the starting sedimentation tank 3 under natural flow, it is not necessary to pay special attention to the water treatment facility after dewatering.

  FIGS. 5 and 6 are views showing a third embodiment of the present invention, in which the same reference numerals are given to the parts common to the first embodiment.

  The third embodiment is characterized in that the treatment tank 31 itself has a so-called double bottom structure instead of having the start-end settling tank 3 and the terminal settling tank 6 shown in FIG.

  As shown in FIGS. 5 and 6, a plurality of upper overflow partition plates 16 having the same upper end height position and a plurality of lower infiltration partition plates 17 having the same lower opening height position are disposed inside the treatment tank 31. Are alternately arranged along the flow direction. The upper overflow partition plate 16 is set so that the lower end thereof is settled on the bottom surface of the treatment tank 31 while the upper end is submerged in the treated water lower than the water level in the treatment tank 31. On the other hand, the lower permeation partition plate 17 is set so that the lower end of the lower permeation partition plate 17 is lifted from the bottom surface of the treatment tank 31 and the upper end is higher than the water level in the treatment tank 31. Thereby, the inside of the processing tank 31 is partitioned into a plurality of regions by at least the upper overflow partition plate 16, and more specifically in the inside of the processing tank 31, more specifically in the space above the mid-sole plate 19 described later, For example, a contact filter medium 18 such as gravel is loaded to form a so-called contact water channel. In addition, a dehydration-reducing facility 10 similar to that shown in FIGS. 1 and 2 is disposed above the starting end portion on the inflow side of the treatment tank 31.

  Here, the flow from the upstream side to the downstream side of the polluted water by alternately arranging the plurality of upper overflow partition plates 16 and the lower infiltration partition plates 17 along the flow direction of the polluted water as described above. At the same time, a vertical flow (so-called vertical osmotic flow) is actively generated. Thereby, the overflow speed when water overflows the upper overflow partition plate 16 is set to be sufficiently larger than the contact flow speed that passes while contacting the contact filter medium 18 in the treatment tank 31 as the contact water channel. It is.

  Further, an intermediate bottom made of a rigid and water-permeable plate material such as a porous plate material such as grating or punching metal having the same height as the lower end position of the lower infiltration partition plate 17 is provided at the bottom of the treatment tank 31. The bottom plate 19 is laid along the flow direction, so that the treatment tank 31 itself has a so-called double bottom structure. The inner bottom plate 19 has a function of permitting the passage of the sludge M that has settled at the bottom while preventing the passage of the contact filter medium 18 loaded in the treatment tank 31. On the side, a plurality of sludge storage portions 26 are formed as independent spaces in the flow direction for depositing and depositing sludge M.

  A work cylinder 27 that also serves as a sludge observation hole is provided adjacent to each of the lower permeation partition plates 17 described above, and the upper end of the work cylinder 27 protrudes above the water level in the treatment tank 31. On the other hand, the lower end of the working cylinder 27 faces the sludge storage part 26 below the middle bottom plate 19. That is, since each sludge storage section 26 is partitioned as an independent space by the upstream and downstream upper overflow partition plates 16, at least one work cylinder 27 faces each sludge storage section 26. It will be out. The sludge M deposited and deposited in the sludge storage section 26 is pumped up by a pump 28 which is a sludge suction means and is pumped to the dehydration and volume reducing facility 10.

  Therefore, according to the third embodiment, the polluted water taken into the treatment tank 31 permeates the overflow at the upper end of each upper overflow partition plate 16 and the lower portion of each lower penetration partition plate 17. By repeating the so-called vertical osmotic flow several times, a gentle flow from the upstream side (inflow side) to the downstream side (discharge side) of the treatment tank 31 is generated as a whole. Then, when the polluted water passes through the contact filter medium 18, suspended matters and sludge contained in the polluted water are collected by the contact filter medium 18, and particularly sludge M having a large mass is precipitated in the lower sludge reservoir 26. , Will be deposited.

  In addition, the soluble dirt contained in the contaminated water, that is, the soluble dirt that cannot be removed by the filtering action, decomposes the organic matter by microorganisms adhering to the surface of the contact filter medium 18 when the contaminated water passes between the contact filter media 18. Is cleaned by contact. By the combined action of these purification processes, the treated water is purified toward the downstream side of the treatment tank 31 and finally discharged to the downstream side R1 of the river R.

  On the other hand, by inserting a so-called bar-like gauge into the sludge reservoir 26 from the work cylinder 27 arranged adjacent to each lower permeation partition plate 17, the sludge M in each sludge reservoir 26 is visually felt or pulled out. It is possible to confirm the deposition status of And if accumulation of the sludge M in the sludge storage part 26 is confirmed, after inserting the suction side hose attached to the pump 28 which is a sludge suction means from the work cylinder 27 to the sludge storage part 26, a pump 28 is started. Such an operation is repeated for each sludge storage unit 26. By doing so, the sludge M accumulated in the sludge reservoir 26 can be pumped up and efficiently pumped to the dehydration and volume reducing facility 10 side. The sludge treatment method on the dehydration and volume reduction facility 10 side is exactly the same as that of the first embodiment shown in FIGS.

  FIG. 7 is a diagram showing a fourth embodiment of the present invention. In the third embodiment, bagging and dewatering is performed in a so-called flat state in which a filter bag 15 filled with sludge is laid. On the other hand, in the fourth embodiment, as in the second embodiment, the filter bag 25 filled with sludge is suspended from the upper part in the dehydration and volume reducing facility 20 so-called hanging. The bag is dewatered by the lowering method. Then, the water filtered by the filter bag 25 naturally flows down to the start end of the treatment tank 31 through the floor plate 22. In addition, the same code | symbol is attached | subjected to the part which is common in previous 2nd Embodiment.

  FIGS. 8 and 9 are views showing a fifth embodiment of the present invention, and the same reference numerals are given to the parts common to the third embodiment shown in FIGS.

  In the fifth embodiment, as shown in FIGS. 8 and 9, the lower half of the plurality of upper overflow partitions 36, that is, the sludge reservoir 26 of each upper overflow partition 36 is faced. The movable part is made movable, and if necessary, the independence of each sludge reservoir 26 partitioned by the upstream upper overflow partition plate 36 and the downstream upper overflow partition plate 36 is released, Adjacent sludge storage portions 26, 26 can be communicated with each other.

  More specifically, as shown in FIG. 10 in addition to FIG. 9, the lower half of each upper overflow partition plate 36 is movable partition plate 36b so that it can swing to the lower end of upper overflow partition plate body 36a by hinge pin 29. In the normal state, each movable partition plate 36b is oriented in the vertical state. Further, the lower end portions of the movable partition plates 36b are connected to each other by the linkage rod 30 so as to have the same span as the span formed by the upper overflow partition plate bodies 36a, 36a, and at the most upstream side. The movable partition plate 36b of the upper overflow partition plate 36 located and the movable partition plate 36b of the upper overflow partition plate 36 located on the most downstream side are provided from the first winch 32 or the second winch 33 which is a winder. The wires 34 are connected to the drawn wires 34, respectively. A work cylinder 27 is provided at the most upstream part and the most downstream part of the processing tank 31, and the wire 34 is inserted through the work cylinder 27. Further, a stopper jig 35 that can move up and down is provided adjacent to any one of the upper overflow partition plates 36. As is clear from FIG. 9, the stopper jig 35 is in the lowest position in the normal state. In addition, the movable partition plate 36b is locked so as to be superposed with the movable partition plate 36b of the adjacent upper overflow partition plate 36.

  Therefore, according to the fifth embodiment, in the normal state shown in FIGS. 8 and 9, since each movable partition plate 36b is in the closed position, the sludge reservoirs 26 at the lower part of the treatment tank 31 are independent of each other. ing.

  On the other hand, when the sludge accumulates in the sludge storage section 26 and the sludge needs to be pumped, the stopper jig 35 shown in FIG. 9 is raised to unlock the movable partition plate 36b adjacent thereto. Then, when the first winch 32 is rotated and pulled up while pulling the corresponding wire 34, the movable partition plates 36b are oscillated all at once and are opened. At this time, the second winch 33 is allowed to easily allow the corresponding wire 34 to be fed out in accordance with the wire pulling operation of the first winch 32. Thereby, the independence of each sludge storage part 26 until then is cancelled | released, and those sludge storage parts 26 and 26 mutually communicate, and it becomes one big space.

  In this state, if the suction side hose attached to the pump 28 is inserted from the work cylinder 27 to the sludge reservoir 26 from the work cylinder 27 as in the case of FIGS. The sludge M accumulated in the lower part of the treatment tank 31 can be efficiently pumped to the dehydration and volume reducing facility 10 side by a single operation. The suction side hose may be always inserted into the working cylinder 27.

  When the work such as the sludge removal is completed, the stopper jig 35 is lowered and returned to the original state, and then the specific movable partition plate 36b abuts against the stopper jig 35 using the second winch 33. Then, each movable partition plate 36b is returned to the original closed state until it is locked. At this time, the first winch 32 is allowed to easily allow the corresponding wire 34 to be fed out in accordance with the wire pulling operation of the second winch 33.

  As described above, according to the fifth embodiment, unlike the third embodiment, the sludge M accumulated in the lower portion of the treatment tank 31 can be pumped at a stroke by a single operation.

  FIG. 11 is a diagram showing a sixth embodiment of the present invention. The same reference numerals are given to the same parts as those of the fourth embodiment shown in FIG. 7 and FIG.

  In the sixth embodiment, as shown in FIG. 11, the same movable partition plate 36b as in FIG. 9 is adopted on the premise of the equipment configuration of FIG. The lower half, that is, the portion of each upper overflow partition plate 36 that faces the sludge reservoir 26 is made movable, and if necessary, the upstream upper overflow partition plate 36 and the downstream upper overflow plate The independence of each sludge storage part 26 partitioned by the flow partition plate 36 is canceled so that the adjacent sludge storage parts 26 and 26 can communicate with each other.

  Therefore, also in the sixth embodiment, the same effect as that of the fifth embodiment can be obtained.

  In the above-described third to sixth embodiments, when so-called bagging and dewatering treatment is performed, a large amount of water permeates through the filter bag at the initial stage, and the amount of permeated water decreases with the passage of time. . Since the water and the water pumped up from the pump 2 directly flow into the treatment tank 31, the water pumped up by the pump 2 and the so-called bagging dehydration process are performed in order to equalize the flow rate of the water flowing into the treatment tank 31. It is desirable that the generated water is once merged before flowing into the treatment layer 31 and the merged water is caused to flow into the treatment tank 31 at a constant flow rate.

Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge treatment function as more concrete embodiment of this invention. The principal part enlarged view of FIG. The characteristic view which shows the sludge variation | change_quantity in the installation of FIG. Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge process function as the 2nd Embodiment of this invention. Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge process function as 3rd Embodiment of this invention. The principal part enlarged view of FIG. Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge process function as 4th Embodiment of this invention. Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge process function as 5th Embodiment of this invention. The principal part enlarged view of FIG. The principal part expansion explanatory drawing of FIG. Explanatory drawing which shows schematic structure of the water quality purification facility provided with the sludge process function as 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Processing tank 3 ... Beginning settling tank 5 ... Filtration tank 6 ... Terminal settling tank 9 ... Contact filter medium 10 ... Dehydration volume reduction facility (dehydration means)
DESCRIPTION OF SYMBOLS 11 ... Processing booth 13 ... Pump 14 ... Pump 15 ... Filtration bag 16 ... Upper overflow partition plate 17 ... Lower osmosis partition plate 18 ... Contact filter medium 19 ... Middle bottom plate (intermediate bottom)
DESCRIPTION OF SYMBOLS 20 ... Dehydration volume reduction facility 21 ... Processing booth 22 ... Floor board 25 ... Filtration bag 26 ... Sludge storage part 28 ... Pump 31 ... Processing tank 36 ... Upper overflow partition plate 36b ... Movable partition plate

Claims (10)

In the treatment method of sludge generated in water purification facilities that purify the quality of polluted water using contact filter media,
Sludge accumulated in the water purification facility is put into a woven or non-woven filter bag to allow the water contained in the sludge to pass through the filter bag.
The permeated water is returned to the water purification facility and purified again.
A method for treating sludge in a water purification facility, wherein the volume of sludge after water permeation is reduced by 40 to 90% by volume with respect to the amount of sludge charged into a filtration bag. When permeating water contained in the sludge put into the filter bag from the filter bag,
2. The method for treating sludge in a water purification facility according to claim 1, wherein the sludge-filled filter bag is suspended so that the weight of the sludge acts on the filter bag as a filtration pressure.   The filter bag filled with sludge is disposed above the water level of the water purification facility, and the water that has passed through the filter bag is returned to the water purification facility under natural flow. A method for treating sludge in water purification facilities. A water channel is formed from the inflow side of the water purification facility where the polluted water is taken to the discharge side that discharges the purified water to the outside.
In the water channel, a lower permeation partition plate that allows water to flow only at the bottom layer while blocking the flow of water, and an upper overflow partition plate that blocks water flow and flows only at the surface layer portion alternately in the flow direction. And a contact water channel by loading the contact filter medium in the space defined by the lower permeation partition plate and the upper overflow partition plate,
The overflow speed when water overflows the upper overflow partition plate is set to be larger than the contact flow speed that passes while contacting the contact filter medium in the contact water channel portion. 4. A method for treating sludge in a water purification facility according to any one of 3 above. In a device for treating sludge generated in a water purification facility that purifies the quality of polluted water using contact filter media,
It is equipped with a dewatering means that puts sludge accumulated in the water purification facility into a filter bag made of woven or non-woven fabric and allows the water contained in the sludge to permeate through the filter bag.
While the permeated water is returned to the water purification facility and repurified,
An apparatus for treating sludge in a water purification facility, wherein the volume of sludge after water permeation is reduced by 40 to 90% by volume with respect to the amount of sludge charged into a filtration bag. In the above dehydrating means, when the water contained in the sludge charged into the filter bag is allowed to permeate through the filter bag,
6. The apparatus for treating sludge in a water purification plant according to claim 5, wherein the sludge-filtering bag is suspended so that the sludge weight acts as a filtering pressure on the filtering bag.   In the dewatering means, the filtration bag into which the sludge has been placed is arranged at a higher level than the water surface level of the water purification facility, and the water that has passed through the filtration bag is returned to the water purification facility under natural flow. An apparatus for treating sludge in a water purification facility according to claim 5 or 6. A water channel is formed from the inflow side of the water purification facility where the polluted water is taken to the discharge side that discharges the purified water to the outside.
In the water channel, a lower permeation partition plate that allows water to flow only at the bottom layer while blocking the flow of water, and an upper overflow partition plate that blocks water flow and flows only at the surface layer portion alternately in the flow direction. And a contact water channel by loading the contact filter medium in the space defined by the lower permeation partition plate and the upper overflow partition plate,
The overflow rate when water overflows the upper overflow partition plate is set to be larger than the contact flow rate that passes while contacting the contact filter medium in the contact water channel part. The sludge treatment apparatus in the water purification facility according to any one of 7. At least a part of the contact water channel part has a double bottom structure with an intermediate bottom allowing permeation of sludge downward,
The sludge treatment apparatus in a water purification facility according to claim 8, wherein the sludge accumulated in the lower space of the intermediate bottom is put into a filter bag.   The lower space of the intermediate bottom is partitioned into a plurality of regions in the flow direction with a movable partition plate, and the plurality of regions can communicate with each other by opening the movable partition plate. An apparatus for treating sludge in a water purification plant according to claim 9.

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