CN111203030A - High-efficiency recyclable solid-liquid separation method and device for industrial wastewater - Google Patents
High-efficiency recyclable solid-liquid separation method and device for industrial wastewater Download PDFInfo
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- CN111203030A CN111203030A CN202010070991.6A CN202010070991A CN111203030A CN 111203030 A CN111203030 A CN 111203030A CN 202010070991 A CN202010070991 A CN 202010070991A CN 111203030 A CN111203030 A CN 111203030A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D36/04—Combinations of filters with settling tanks
Abstract
The invention relates to a high-efficiency recyclable solid-liquid separation method for industrial wastewater, which comprises the following specific steps; s1: collecting waste water; s2: sieving by using a vibrating screen; s3: layering wastewater, namely dividing the wastewater subjected to impurity removal into upper-layer liquid and lower-layer concentrated sludge through a corresponding separation mechanism, wherein the concentration of suspended matters in the upper-layer liquid is controlled to be below 1000ppm, and the water content of the lower-layer concentrated sludge is not more than 96%; s4: solid-liquid separation, S41: sending the supernatant to a filter pressing device for solid-liquid separation, recycling the separated filtrate, and intercepting suspended matters; s42: and feeding the sludge at the bottom, and conveying the lower-layer concentrated sludge with the water content of not more than 96% to the filter pressing equipment for continuously carrying out solid-liquid separation operation. The invention can effectively and comprehensively recover the slurry and the cleaning water, effectively and greatly improve the recovery efficiency and the recovery effect, and effectively reduce the cost consumed by recovery, thereby generating enough economic benefit and improving the resource utilization rate.
Description
Technical Field
The invention relates to a high-efficiency recyclable solid-liquid separation method and a high-efficiency recyclable solid-liquid separation device for industrial wastewater, which are mainly applied to the treatment of industrial wastewater of high-concentration suspended matters such as sanitary ceramic wastewater, kaolin deep processing wastewater and wafer grinding wastewater.
Background
In the sanitary ceramics, the wafer grinding and the kaolin deep processing processes, especially a large amount of equipment cleaning wastewater and ground cleaning wastewater generated in the raw material refining and forming processes, the wastewater has high-concentration suspended matters, and the suspended matters have higher recovery value. At present, most of the treatment methods of the strand of wastewater use a certain amount of mixed flocculation agents (such as PAC and PAM) to carry out coagulation precipitation and then carry out solid-liquid separation, supernatant liquid after separation is recycled after advanced treatment, and mud is subjected to conditioning and filter pressing to form mud cakes and is transported outside. Because a certain amount of mixed flocculating agent is added in the wastewater treatment process, the performance of the slurry is damaged, the recycling value and the recycling efficiency of the slurry are reduced, and the conductivity and the salt content are increased in the recycling process of the reclaimed water, so that the field of reclaimed water recycling is limited. In order to improve the utilization rate of resources, namely, comprehensively recycling and reusing the slurry and the cleaning water, many manufacturers begin to adopt a filtering device to separate and reuse the slurry and the cleaning water, the filtering device with the best separation efficiency and separation effect is a plate-and-frame filter press at present, but because the content of high-concentration suspended matters (slurry) in the cleaning wastewater is unbalanced, the amount of the wastewater is large, the content proportion of the high-concentration suspended matters (slurry) is not high relatively, the separation effect and efficiency of directly adopting the plate-and-frame filter press to filter the slurry are not good, and under the premise of high operation cost input and consumption of a large amount of electric energy and filter cloth loss, the economic benefit and energy saving obtained by slurry recovery and cleaning water recovery are not increased, but reduced.
Therefore, the research and development of the high-efficiency recyclable solid-liquid separation method and the device for the same, which can effectively and comprehensively recycle the slurry and the cleaning water, effectively and greatly improve the recycling efficiency and the recycling effect, and effectively reduce the cost consumed by recycling, can generate sufficient economic benefits and improve the resource utilization rate, are the research purposes of the invention.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an efficient recyclable solid-liquid separation method and device for industrial wastewater, and the efficient recyclable solid-liquid separation method and device for industrial wastewater can effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
an efficient recyclable solid-liquid separation method for industrial wastewater comprises the following specific steps;
s1: collecting waste water;
s2: sieving the wastewater by using a vibrating screen to remove large-particle ineffective impurities in the wastewater;
s3: layering wastewater, namely dividing the wastewater subjected to impurity removal into upper-layer liquid and lower-layer concentrated sludge through a corresponding separation mechanism, wherein the concentration of suspended matters in the upper-layer liquid is controlled to be below 1000ppm, and the water content of the lower-layer concentrated sludge is not more than 96%;
s4: the solid-liquid separation is carried out,
s41: sending the supernatant to a filter pressing device for solid-liquid separation, recycling the separated filtrate, intercepting suspended matters, gradually reducing the solid-liquid separation efficiency along with the separation, and stopping feeding the supernatant when the feeding speed of the solid-liquid separation is reduced to below 1/2 of the feeding speed of the initial solid-liquid separation;
s42: feeding the sludge at the bottom, sending the lower-layer concentrated sludge with the water content not more than 96% to the filter pressing equipment for continuously carrying out solid-liquid separation operation, continuously recycling the separated filtrate, quickly filling the chambers of the whole filter pressing equipment with the high-concentration lower-layer concentrated sludge, further reducing the separation efficiency, and stopping feeding when the feeding speed of solid-liquid separation is reduced to below 1/5 of the initial solid-liquid separation feeding speed.
And step S5 of discharging the filter cake is further included after the solid-liquid separation in the step S4, and when the water content of the filter cake after the solid-liquid separation is reduced to be below 30%, the plate and frame filter press is stopped and the filter cake is discharged.
In the solid-liquid separation process of the step S4, the turbidity of the separated filtrate is lower than 10NTU for recycling.
The high-efficiency recyclable solid-liquid separation device for the industrial wastewater comprises a wastewater collection tank, a vibrating screen, a sedimentation tank, a filter pressing device and an electric controller which are sequentially arranged, wherein the vibrating screen comprises a rack and a liquid collection tank which is fixedly arranged below the rack, a corresponding screen plate is obliquely arranged above the rack through a buffer spring, the top of the screen plate is fixedly connected with a corresponding vibrating motor downwards, a cover plate covers the periphery of the vibrating motor, and a plurality of corresponding screen holes are formed in the lower part of the screen plate; the top feeding end of the sieve plate is connected to the wastewater collecting tank through a corresponding wastewater pipe and a first sewage pump, and a corresponding waste collecting tank is arranged below the bottom discharging end of the sieve plate; the feeding end of the sedimentation tank is connected to the liquid collecting tank through a corresponding water inlet pipe and a second sewage pump, a corresponding discharging tank is arranged above the discharging end of the sedimentation tank, a corresponding filter screen is arranged on the feeding end fixing device of the discharging tank, the discharging end of the discharging tank is connected with a corresponding upper layer liquid discharging pipe in a communicating manner, the bottom end of the discharging end of the sedimentation tank is connected with a corresponding lower layer concentrated sludge discharging pipe in a communicating manner, the upper layer liquid discharging pipe and the lower layer concentrated sludge discharging pipe are respectively connected to the feeding ends of corresponding plunger pumps through connection, and corresponding discharging electromagnetic valves are respectively arranged on the upper layer liquid discharging pipe and the lower layer concentrated sludge discharging pipe; the filter pressing equipment adopts a plate and frame filter press, the discharge end of the plunger pump is connected to the feed end of the plate and frame filter press through a corresponding feeding pipe, and a corresponding flowmeter is installed on the feeding pipe; the vibration motor, the first sewage pump, the second sewage pump, the plunger pump, the discharging electromagnetic valve and the opening and closing switch of the plate-frame filter press are respectively connected to the electric controller.
The flow rate of the plunger pump is 24m3H, maximum flow 30m3/h。
The filter cloth of the plate-and-frame filter press is specially selected filter cloth with the mesh number larger than 500 meshes and 108C thickening and calendaring.
And a corresponding waste collecting tank is arranged below the discharge end at the bottom of the sieve plate.
The invention has the advantages that:
1) according to the invention, large-particle recyclable materials are effectively screened out by the vibrating screen, so that the subsequent solid-liquid separation operation is ensured to be carried out smoothly, and the mud after solid-liquid separation can be directly put into recycling.
2) Before solid-liquid separation, a wastewater layering treatment process is added, wastewater is effectively divided into upper-layer liquid and lower-layer concentrated sludge through layering treatment, and then the upper-layer liquid and the lower-layer concentrated sludge are respectively subjected to solid-liquid separation through filter pressing. The most important is to control the concentration of suspended matters in the supernatant to be below 1000ppm for discharging, and the control of greatly reducing the content of the suspended matters ensures that the suspended matters mixed in the supernatant can be quickly intercepted after the supernatant enters the filter pressing equipment, thereby effectively improving the solid-liquid separation effect and efficiency; and the water content of the lower layer of concentrated sludge is controlled to be not more than 96%, and the water mixed in the lower layer of concentrated sludge can be quickly extruded after the lower layer of concentrated sludge enters the filter pressing equipment through the control of greatly reducing the water content of the lower layer of concentrated sludge, so that the solid-liquid separation effect and efficiency are further effectively improved.
3) On the basis of adding a layering treatment process, the solid-liquid separation is correspondingly divided into two steps to be carried out, firstly, the upper layer liquid is subjected to solid-liquid separation, and the upper layer liquid is low in suspended matter content, so that the solid-liquid separation can be efficiently realized at a high speed, the speed of the most important solid-liquid separation is reduced very slowly, and the solid-liquid separation efficiency is effectively and greatly improved. When the feed rate of the solid-liquid separation is decreased to 1/2 or less, which is the initial feed rate of the solid-liquid separation, the filter medium of the filter press apparatus is clogged relatively severely, the solid-liquid separation rate is no longer advantageous, and the solid-liquid separation is adversely affected when the filter medium is moved downward. Therefore, when the feed rate of solid-liquid separation is decreased to 1/2 or less of the initial solid-liquid separation feed rate, the solid-liquid separation operation of the upper layer liquid is stopped, and the bottom sludge feed is immediately changed to start the solid-liquid separation of the lower layer concentrated sludge. Because the filter material of the filter pressing device after the solid-liquid separation of the upper layer liquid is completed is seriously blocked, the cavity of the whole filter plate is quickly filled with the high-concentration lower layer concentrated sludge, and a small amount of water mixed in the lower layer concentrated sludge can be quickly extruded (filtered) for recycling under the action of the larger pressure of the high-concentration lower layer concentrated sludge, so that the quick solid-liquid separation operation is realized.
4) The analysis of the solid-liquid separation speed is realized through the monitoring of the feeding flow in the filter pressing process, the solid-liquid separation operation of the upper layer liquid is realized before the filter material is blocked in a large area, the solid-liquid separation of the lower layer concentrated sludge is realized after the filter material is blocked in a large area, the solid-liquid separation operation of the upper layer liquid and the solid-liquid separation operation of the lower layer concentrated sludge are connected in place and complement each other, and therefore the whole filter pressing operation is ensured to be always in a high-efficiency and high-speed operation state. The mud and the cleaning water can be effectively and comprehensively recovered, the recovery efficiency and the recovery effect can be effectively and greatly improved, the cost consumed by recovery can be effectively reduced, and therefore sufficient economic benefits are generated and the resource utilization rate is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
referring to fig. 1, an efficient recyclable solid-liquid separation device for industrial wastewater comprises a wastewater collection tank 1, a vibrating screen 2, a sedimentation tank 3, a filter pressing device 4 and an electric controller 5 (the electric controller 5 in the embodiment adopts a programmable PLC encoder), which are sequentially arranged, wherein the vibrating screen 2 comprises a rack 201 and a liquid collecting tank 202 fixedly arranged below the rack 201, a corresponding screen plate 203 is obliquely arranged above the rack 201 through a buffer spring 6, the top of the screen plate 203 is fixedly connected with a corresponding vibrating motor 204 downwards, a cover plate 7 covers the periphery of the vibrating motor 204, and a plurality of corresponding screen holes are arranged below the cover plate 7 of the screen plate 203; the top feed end of the screen deck 203 is connected to the wastewater collection tank 1 by a respective wastewater pipe 8 and a first sewage pump 9; the feeding end of the sedimentation tank 3 is connected to the liquid collecting tank 202 through a corresponding water inlet pipe 10 and a second sewage pump 11, a corresponding discharge tank 12 is arranged above the discharge end of the sedimentation tank 3, a corresponding filter screen 13 is arranged at the feeding end of the discharge tank 12, the discharge end of the discharge tank 12 is communicated and connected with a corresponding upper layer liquid outlet pipe 14, the bottom end of the discharge end of the sedimentation tank 3 is communicated and connected with a corresponding lower layer concentrated sludge discharge pipe 15, the upper layer liquid outlet pipe 14 and the lower layer concentrated sludge discharge pipe 15 are respectively connected to the feeding ends of corresponding plunger pumps 16, and corresponding discharge electromagnetic valves 17 are respectively arranged on the upper layer liquid outlet pipe 14 and the lower layer concentrated sludge discharge pipe 15; the filter pressing device 4 adopts a plate and frame filter press (the plate and frame filter press adopted in the embodiment is a commercially available existing device), the discharge end of the plunger pump 16 is connected to the feed end of the plate and frame filter press through a corresponding feeding pipe 18, and a corresponding flowmeter 19 is installed on the feeding pipe 18; the vibration motor 204, the first sewage pump 9, the second sewage pump 11, the plunger pump 16, the discharge electromagnetic valve 17, and the on-off switch of the plate and frame filter press are respectively connected to the electric controller 5.
The flow rate of the plunger pump 16 is 24m3H, maximum flow 30m3H is used as the reference value. The filter cloth of the plate-and-frame filter press is specially selected filter cloth with 500 meshes and 108C thickening and calendaring. A corresponding waste collection tank 20 is provided below the bottom discharge end of the screen deck 203.
Referring to fig. 2, a method for separating solid from liquid in industrial wastewater with high efficiency and recoverability comprises the following specific steps;
s1: collecting wastewater through the wastewater collecting tank 1;
s2: the first sewage pump 9 is started, the wastewater in the wastewater collecting tank 1 is pumped to the feeding end at the top of the sieve plate 203 of the vibrating sieve 2, and the sieve plate 203 of the vibrating sieve 2 effectively removes large ineffective impurities in the wastewater;
s3: the second sewage pump 11 is started, the wastewater in the liquid collecting tank 202 is pumped into the sedimentation tank 3, the wastewater is statically layered in the sedimentation tank 3, the wastewater after impurity removal is divided into upper-layer liquid and lower-layer concentrated sludge through the sedimentation tank 3, the concentration of suspended matters in the upper-layer liquid is effectively controlled below 1000ppm through the matching arrangement of the discharge tank 12 and the filter screen 13, and the water content of the precipitated lower-layer concentrated sludge is not more than 96%;
s4: the solid-liquid separation is carried out,
s41: and (3) starting the plunger pump 16, simultaneously controlling the opening of the discharge electromagnetic valve 17 on the upper layer liquid outlet pipe 14, and controlling the closing of the discharge electromagnetic valve 17 on the lower layer concentrated sludge discharge pipe 15. Sending the supernatant to a plate and frame filter press for solid-liquid separation, recycling the separated filtrate with turbidity lower than 10NTU, intercepting suspended matters, gradually reducing solid-liquid separation efficiency along with the separation, and decreasing the feeding speed of the solid-liquid separation from the initial 30m3The h is reduced to 15m3When the pressure is over/h, the discharge electromagnetic valve 17 on the upper layer liquid outlet pipe 14 is controlled to be closed, and the discharge electromagnetic valve 17 on the lower layer concentrated sludge discharge pipe 15 is controlled to be opened;
s42: feeding bottom sludge, sending lower layer concentrated sludge with water content not more than 96% to the plate and frame filter press for continuously performing solid-liquid separation, continuously recycling the separated filtrate with turbidity lower than 10NTU, quickly filling the whole chamber of the filter press equipment with high concentration lower layer concentrated sludge, further reducing separation efficiency, and when the feeding speed of solid-liquid separation is reduced from the initial 30m3The h is reduced to 6m3At the time of/h, stopping feeding;
s5: and when the water content of the filter cake after solid-liquid separation is reduced to below 30%, stopping the plate-and-frame filter press and discharging the filter cake.
On the basis of adding a layering treatment process, the solid-liquid separation is correspondingly divided into two steps, firstly, the upper layer liquid is subjected to solid-liquid separation, after the upper layer liquid is subjected to solid-liquid separation, the bottom sludge is immediately used for feeding, and the solid-liquid separation of the lower layer concentrated sludge is started. The analysis of the solid-liquid separation speed is realized through the monitoring of the feeding flow in the filter pressing process, the solid-liquid separation operation of the upper layer liquid is realized before the filter material is blocked in a large area, the solid-liquid separation of the lower layer concentrated sludge is realized after the filter material is blocked in a large area, the solid-liquid separation operation of the upper layer liquid and the solid-liquid separation operation of the lower layer concentrated sludge are connected in place and complement each other, and therefore the whole filter pressing operation is ensured to be always in a high-efficiency and high-speed operation state. The mud and the cleaning water can be effectively and comprehensively recovered, the recovery efficiency and the recovery effect can be effectively and greatly improved, the cost consumed by recovery can be effectively reduced, and therefore sufficient economic benefits are generated and the resource utilization rate is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An efficient recyclable solid-liquid separation method for industrial wastewater is characterized by comprising the following specific steps;
s1: collecting waste water;
s2: sieving the wastewater by using a vibrating screen to remove large-particle ineffective impurities in the wastewater;
s3: layering wastewater, namely dividing the wastewater subjected to impurity removal into upper-layer liquid and lower-layer concentrated sludge through a corresponding separation mechanism, wherein the concentration of suspended matters in the upper-layer liquid is controlled to be below 1000ppm, and the water content of the lower-layer concentrated sludge is not more than 96%;
s4: the solid-liquid separation is carried out,
s41: sending the supernatant to a filter pressing device for solid-liquid separation, recycling the separated filtrate, intercepting suspended matters, gradually reducing the solid-liquid separation efficiency along with the separation, and stopping feeding the supernatant when the feeding speed of the solid-liquid separation is reduced to below 1/2 of the feeding speed of the initial solid-liquid separation;
s42: feeding the sludge at the bottom, sending the lower-layer concentrated sludge with the water content not more than 96% to the filter pressing equipment for continuously carrying out solid-liquid separation operation, continuously recycling the separated filtrate, quickly filling the chambers of the whole filter pressing equipment with the high-concentration lower-layer concentrated sludge, further reducing the separation efficiency, and stopping feeding when the feeding speed of solid-liquid separation is reduced to below 1/5 of the initial solid-liquid separation feeding speed.
2. The method for separating solid from liquid in industrial wastewater with high efficiency and recoverability according to claim 1, characterized in that: and step S5 of discharging the filter cake is further included after the solid-liquid separation in the step S4, and when the water content of the filter cake after the solid-liquid separation is reduced to be below 30%, the plate and frame filter press is stopped and the filter cake is discharged.
3. The method for separating solid from liquid in industrial wastewater with high efficiency and recoverability according to claim 2, characterized in that: in the solid-liquid separation process of the step S4, the turbidity of the separated filtrate is lower than 10NTU for recycling.
4. The utility model provides a high-efficient recoverable solid-liquid separation equipment of industrial waste water, includes waste water collecting pit, shale shaker, sedimentation tank, filter pressing equipment and the electric controller that sets up in proper order, its characterized in that:
the vibrating screen comprises a rack and a liquid collecting tank fixedly arranged below the rack, a corresponding screen plate is obliquely arranged above the rack through a buffer spring, the top of the screen plate is fixedly connected with a corresponding vibrating motor downwards, a cover plate covers the periphery of the vibrating motor, and a plurality of corresponding screen holes are arranged below the cover plate on the screen plate; the top feeding end of the sieve plate is connected to the wastewater collecting tank through a corresponding wastewater pipe and a first sewage pump, and a corresponding waste collecting tank is arranged below the bottom discharging end of the sieve plate;
the feeding end of the sedimentation tank is connected to the liquid collecting tank through a corresponding water inlet pipe and a second sewage pump, a corresponding discharging tank is arranged above the discharging end of the sedimentation tank, a corresponding filter screen is arranged on the feeding end fixing device of the discharging tank, the discharging end of the discharging tank is connected with a corresponding upper layer liquid discharging pipe in a communicating manner, the bottom end of the discharging end of the sedimentation tank is connected with a corresponding lower layer concentrated sludge discharging pipe in a communicating manner, the upper layer liquid discharging pipe and the lower layer concentrated sludge discharging pipe are respectively connected to the feeding ends of corresponding plunger pumps through connection, and corresponding discharging electromagnetic valves are respectively arranged on the upper layer liquid discharging pipe and the lower layer concentrated sludge discharging pipe;
the filter pressing equipment adopts a plate and frame filter press, the discharge end of the plunger pump is connected to the feed end of the plate and frame filter press through a corresponding feeding pipe, and a corresponding flowmeter is installed on the feeding pipe;
the vibration motor, the first sewage pump, the second sewage pump, the plunger pump, the discharging electromagnetic valve and the opening and closing switch of the plate-frame filter press are respectively connected to the electric controller.
5. The high-efficiency recyclable solid-liquid separation device for industrial wastewater as claimed in claim 4, characterized in that: the flow rate of the plunger pump is 24m3H, maximum flow 30m3/h。
6. The high-efficiency recyclable solid-liquid separation device for industrial wastewater as claimed in claim 4, characterized in that: the filter cloth of the plate-and-frame filter press is specially selected filter cloth with the mesh number larger than 500 meshes and 108C thickening and calendaring.
7. The high-efficiency recyclable solid-liquid separation device for industrial wastewater as claimed in claim 4, characterized in that: and a corresponding waste collecting tank is arranged below the discharge end at the bottom of the sieve plate.
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| CN202010070991.6A CN111203030B (en) | 2020-01-21 | 2020-01-21 | High-efficiency recyclable solid-liquid separation method for industrial wastewater |
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2020
- 2020-01-21 CN CN202010070991.6A patent/CN111203030B/en active Active
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| CN101658743A (en) * | 2009-09-29 | 2010-03-03 | 吴爱华 | Tailing dry discharge and tailing water treatment technology with high efficiency and low energy consumption |
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| CN104529127A (en) * | 2014-12-31 | 2015-04-22 | 梁毅 | Sludge dewatering method for coating plate-and-frame filter press with filter aid medium in advance |
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