CN112661306A - System and method for treating pyrolysis press filtrate of excess sludge in urban sewage plant - Google Patents
System and method for treating pyrolysis press filtrate of excess sludge in urban sewage plant Download PDFInfo
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Abstract
The invention provides a system and a method for treating residual sludge pyrolytic pressure filtrate in a town sewage plant. The protein concentrated solution prepared by the existing system and method contains high-concentration calcium ions, and the problem is difficult to industrialize and further affects large-scale resource utilization, and the system and method exactly solve the problem. The utility model provides a system for processing of surplus sludge pyrolysis press filtrate in town sewage plant which characterized in that: the treatment system comprises a filtrate dosing mixing tank, a horizontal flow sedimentation tank, a pH adjusting tank and a filtering storage tank, wherein a liquid inlet of the filtrate dosing mixing tank is connected with a filtrate outlet of the plate-and-frame filter press, a liquid outlet of the filtrate dosing mixing tank is connected with a liquid inlet of the horizontal flow sedimentation tank, a liquid outlet of the horizontal flow sedimentation tank is connected with a liquid inlet of the pH adjusting tank, and a sludge discharge port of the horizontal flow sedimentation tank is connected with a feed inlet of the filtering storage tank; the discharge port of the filtering storage tank is connected with the feed inlet of the batching kettle, the discharge port of the batching kettle is connected with the feed inlet of the pyrolysis reaction kettle, the discharge port of the pyrolysis reaction kettle is connected with the feed inlet of the flash evaporation device, and the discharge port of the flash evaporation device is connected with the plate-and-frame filter press.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a system and a method for treating residual sludge pyrolytic press filtrate in a town sewage plant.
Background
With the wide adoption of the biotechnology of the sewage plant and the continuous upgrading of the sewage plant, the yield of the sludge is obviously increased in recent years, the treatment and disposal of the sewage sludge have various treatment processes at present, but how to change waste into valuable is to make the sludge into a resource product, and the development of a treatment device becomes the bottleneck of the resource application of the sludge. At present, the alkaline thermal hydrolysis process becomes one of the hot mainstream processes, and the resource products comprise: the liquid fertilizer and the soil remediation nutrient soil with rich nutrition have the difficulties that after the hydrolysis, nutrition transfer and conversion of sludge, the efficient separation of materials is realized through a plate frame, and the stable operation is realized due to good liquid phase components and high quality. At present, when the filter pressing is difficult by a common process, the addition of an alkaline conditioner is adjusted, the quality of the hydrolysate is directly influenced, the next procedure is often influenced, the production is influenced, and the hydrolysate cannot be recycled.
The prior invention patent application with publication number CN1868929A and name "production process and equipment for preparing hydrolyzed protein by hydrolyzing excess activated sludge with quicklime" discloses a production process and equipment for preparing hydrolyzed protein by hydrolyzing excess activated sludge with quicklime, which are suitable for industrial production. The process comprises mixing and stirring the residual activated sludge, water and quicklime according to the proportion of 1: 0.06 for 20-30 minutes; pumping the mixed solution into a hydrolysis reaction kettle for hydrolysis, wherein the hydrolysis time is 1-3h under the conditions that the working pressure is 0.4-0.7MPa and the hydrolysis temperature is 135-150 ℃; hydrolyzing, filtering, adjusting pH of the filtrate to 7.0-8.5 with hydrochloric acid, concentrating to obtain protein concentrate, and optionally drying to obtain dry protein product. However, the concentrated protein solution or the dried protein product obtained by the patent application of the invention contains high-concentration calcium ions, and the problem is difficult to industrialize without solving the problem, thereby influencing large-scale resource utilization.
The protein concentrated solution obtained by the invention patent with the prior publication number of CN 103435389B and the name of 'a method for preparing a bacterial peptide organic fertilizer by using microbial cell waste liquid' also contains high-concentration calcium ions, and the problem is not solved, so that the industrialization is difficult, and the large-scale resource utilization is further influenced.
Disclosure of Invention
The invention provides a system and a method for treating residual sludge pyrolysis press filtrate in a town sewage plant, which can solve the problem that a protein concentrated solution prepared by the existing system and method contains high-concentration calcium ions, and the problem that the protein concentrated solution is difficult to industrialize so as to influence large-scale resource utilization is not solved.
The technical scheme is that, a system for treating residual sludge pyrolysis press filtrate in town sewage plants, which is characterized in that: the treatment system comprises a filtrate dosing and mixing tank, a horizontal flow sedimentation tank, a pH adjusting tank and a filtering storage tank, wherein a liquid inlet of the filtrate dosing and mixing tank is connected with a filtrate outlet of the plate-and-frame filter press, a liquid outlet of the filtrate dosing and mixing tank is connected with a liquid inlet of the horizontal flow sedimentation tank, a liquid outlet of the horizontal flow sedimentation tank is connected with a liquid inlet of the pH adjusting tank, and a sludge discharge port of the horizontal flow sedimentation tank is connected with a feed inlet of the filtering storage tank;
the filtrate dosing mixing tank is connected with a sodium carbonate storage tank, and the pH adjusting tank is connected with a concentrated sulfuric acid storage tank;
the discharge port of the filtering storage tank is connected with the feed inlet of the batching kettle, the discharge port of the batching kettle is connected with the feed inlet of the pyrolysis reaction kettle, the discharge port of the pyrolysis reaction kettle is connected with the feed inlet of the flash evaporation device, and the discharge port of the flash evaporation device is connected with the plate-and-frame filter press.
Furthermore, a sludge scraping device is installed at the bottom of the horizontal sedimentation tank, and a vertical inclined plate is connected to a frame of the sludge scraping device installation scraper.
Furthermore, the vertical inclined plates are arranged in two and are connected in an X shape, and the wide surfaces of the vertical inclined plates are perpendicular to the advancing direction of the sludge scraping device.
Further, the frame includes slip table, support and stopper, the both sides that the slip table is located the width direction of advection sedimentation tank are connected with support, stopper from interior to exterior setting respectively, be formed with between support and the stopper with the cell body lateral wall direction complex recess of advection sedimentation tank, the leg joint the scraper blade, the advection sedimentation tank top is provided with the lead screw that sets up along its length direction, the motor is connected to the one end of lead screw, the lead screw support is connected to the other end, the lead screw support the motor respectively with the cell body length direction's of advection sedimentation tank both sides wall fixed connection, be equipped with on the lead screw with lead screw complex nut seat.
A method for treating pyrolysis press filtrate of excess sludge in a town sewage plant is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s01, mixing the press filtrate and sodium carbonate according to the weight ratio of 500: 2 is added into a filtrate dosing mixing pool, the stirring speed is 30r/min, and the retention time is 20 min;
s02, conveying the filter pressing liquid after the medicine is added in the step S01 to a horizontal flow sedimentation tank, wherein the moving speed of a vertical inclined plate and a scraper plate is 0.1-0.5 m/min, and the retention time is 3 h;
s03, conveying the supernatant of the horizontal flow sedimentation tank to a pH adjusting tank, adding concentrated sulfuric acid into the pH adjusting tank through a filtering storage tank by a pump, and adjusting the pH of the supernatant to 7.0-9.5;
the sediment in the sediment hopper of the horizontal sedimentation tank is conveyed to a filtering storage tank by a pump;
s04, concentrating the supernatant neutralized in the step S03 to obtain protein concentrated solution,
the sediment stored in the step S03 is conveyed to a batching kettle through a pump to be mixed with the sludge.
Further, the preparation method of the press filtrate comprises the following steps,
s11, mixing the sludge with water and lime with water content of 80% obtained by a sewage treatment plant according to the ratio of 10: 6: adding the mixture into a batching kettle according to the mass ratio of 0.65, preheating and uniformly stirring;
s12, adding the sludge mixture stirred in the step S11 into a reaction kettle, reacting for 2 hours at 120 ℃,
s13, cooling the sludge mixture after the reaction in the step S12 to 60-80 ℃ through a flash evaporation device 3;
s14, the sludge mixture cooled in the step S13 enters a plate and frame system for filter pressing, and filter pressing liquid is obtained.
According to the treatment system and method, sodium carbonate is added into the filter liquor obtained after plate-and-frame filter pressing of the sludge, calcium ions in the filter pressing liquor are promoted to form calcium carbonate precipitates, the calcium carbonate precipitates are separated from the protein concentrated liquor, the quality of the protein concentrated liquor is improved, industrialization is ensured, large-scale resource utilization is realized, meanwhile, the calcium carbonate precipitates are collected and stored, and are used as filter aids for plate-and-frame filter pressing, so that the calcium carbonate precipitates are recycled, the dosage of thermokalite agents is further reduced, and the cost is saved.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a schematic structural diagram of the horizontal flow sedimentation tank of the invention.
Detailed Description
As shown in fig. 1 and 2, the system for treating the residual sludge pyrolytic press filtrate in the urban sewage plant comprises a filtrate dosing and mixing tank 5, a horizontal flow sedimentation tank 7, a pH adjusting tank 8 and a filtering storage tank 10, wherein a liquid inlet of the filtrate dosing and mixing tank 5 is connected with a filtrate outlet of a plate-and-frame filter press 4, a liquid outlet of the filtrate dosing and mixing tank is connected with a liquid inlet of the horizontal flow sedimentation tank 7, a liquid outlet of the horizontal flow sedimentation tank 7 is connected with a liquid inlet of the pH adjusting tank, and a sludge discharge port of the horizontal flow sedimentation tank 7 is connected with a feed inlet of the filtering storage tank 10;
the filtrate dosing and mixing tank 5 is connected with a sodium carbonate storage tank 6, the pH adjusting tank 8 is connected with a concentrated sulfuric acid storage tank 9, and stirrers are respectively arranged in the filtrate dosing and mixing tank 5 and the pH adjusting tank 8;
the discharge gate of filtering storage 10 jar is connected with batching cauldron 1's feed inlet, and batching cauldron 1's discharge gate is connected with pyrolysis reaction cauldron 2's feed inlet, and pyrolysis reaction cauldron 2's discharge gate is connected with flash distillation unit 3's feed inlet, and flash distillation unit 3 discharge gate is connected with plate and frame filter press 4.
The bottom of the horizontal sedimentation tank 7 is provided with a sludge scraping device, and a vertical inclined plate is connected on a frame of a scraper blade of the sludge scraping device. Specifically, the vertical inclined plates are arranged in two and are connected in an X shape, and the wide surfaces of the vertical inclined plates are perpendicular to the advancing direction of the sludge scraping device. The frame includes slip table 74, support and stopper, the both sides that slip table 74 is located the width direction of advection sedimentation tank are connected with the support that sets up from inside to outside respectively, the stopper, be formed with between support and the stopper with the cell body 71 lateral wall direction complex recess of advection sedimentation tank, the leg joint scraper blade, advection sedimentation tank top is provided with the lead screw that sets up along its length direction, motor 73 is connected to the one end of lead screw, lead screw support 72 is connected to the other end, lead screw support 72, motor 73 respectively with the cell body 71 length direction's of advection sedimentation tank both sides wall fixed connection, be equipped with on the lead screw with lead screw complex nut seat. The horizontal flow sedimentation tank is in the prior art, a sludge accumulation hopper 75 is arranged on the lower portion of one side of the tank body in the length direction, 76 is a supporting leg, and the scraper plate moves along the length direction of the tank body under the driving of the matching of a motor, a screw rod, a nut seat, a sliding table and a bracket, so that the sediment at the bottom of the tank body is scraped to the sludge accumulation hopper 75 and is led out.
A method for treating residual sludge pyrolytic press filtrate in a town sewage plant, which comprises the following steps,
s01, adding 500t of press filtrate and 2t of sodium carbonate into a filtrate dosing mixing tank, stirring at the speed of 30r/min, and staying for 20 min;
s02, conveying the filter pressing liquid after the medicine is added in the step S01 to a horizontal flow sedimentation tank, wherein the moving speed of a vertical inclined plate and a scraper plate is 0.1-0.5 m/min, and the retention time is 3 h;
s03, conveying the supernatant of the horizontal flow sedimentation tank to a pH adjusting tank, adding concentrated sulfuric acid into the pH adjusting tank through a concentrated sulfuric acid tank by a pump, and adjusting the pH of the supernatant to 7.0-9.5;
accumulating and dehydrating 1.3 tons of hardness substances in a sediment hopper of the horizontal sedimentation tank every day, and pumping the sediment into a filtering storage tank;
s04, concentrating the supernatant neutralized in the step S03 to obtain protein concentrated solution,
the sediment stored in the filtering material storage tank in the step S03 is conveyed to a batching kettle by a pump to be mixed with the sludge.
The preparation method of the pressure filtrate comprises the following steps,
s11, adding 10t of sludge with water content of 80 percent, 6t of water and 650kg of lime which are obtained by a sewage treatment plant into a batching kettle, preheating and uniformly stirring;
s12, adding the sludge mixture stirred in the step S11 into a reaction kettle, reacting for 2 hours at 120 ℃,
s13, cooling the sludge mixture after the reaction in the step S12 to 60-80 ℃ through a flash evaporation device;
s14, the sludge mixture cooled in the step S13 enters a plate and frame system for filter pressing, and the filter pressing liquid is obtained by pressing under the pressure of 1.0-1.1 MPa.
The device system enables the recycling rate of the hardness substances to reach 65%, further reduces the dosage of the thermokalite medicament, saves the cost, reduces the water content of the soil improvement mud cake from 45% to 40%, obtains the particle size of the hardness substances of 500 meshes (average value), and reduces the filtering time of the filter pressing liquid from 2.5h (adopting 300 meshes of calcium carbonate, average value) to 2.0 h; meanwhile, the hardness of the protein press filtrate is further reduced to about 1.5g/L from 4.0g/L, and the quality of the protein concentrated solution is effectively improved. The particle size of the originally adopted calcium carbonate filter aid is 300 meshes, and the cost is increased by more than 20 percent because the 500-mesh calcium carbonate is compared with 300 meshes. In this application, calcium ion in the filtrating is used for plate and frame filter press's filter aid after precipitating with the form of calcium carbonate, simultaneously, adds the setting of stirring speed, liquid dwell time when adding the medicine through filtrating in the medicine mixing tank 5 sodium carbonate to and the setting of vertical swash plate and scraper blade removal speed, liquid dwell time in the advection sedimentation tank, the particle diameter of the calcium carbonate precipitate of control generation is at 500 meshes, can also effectively reduce cost.
Claims (6)
1. The utility model provides a system for processing of surplus sludge pyrolysis press filtrate in town sewage plant which characterized in that: the treatment system comprises a filtrate dosing and mixing tank, a horizontal flow sedimentation tank, a pH adjusting tank and a filtering storage tank, wherein a liquid inlet of the filtrate dosing and mixing tank is connected with a filtrate outlet of the plate-and-frame filter press, a liquid outlet of the filtrate dosing and mixing tank is connected with a liquid inlet of the horizontal flow sedimentation tank, a liquid outlet of the horizontal flow sedimentation tank is connected with a liquid inlet of the pH adjusting tank, and a sludge discharge port of the horizontal flow sedimentation tank is connected with a feed inlet of the filtering storage tank;
the filtrate dosing mixing tank is connected with a sodium carbonate storage tank, and the pH adjusting tank is connected with a concentrated sulfuric acid storage tank;
the discharge port of the filtering storage tank is connected with the feed inlet of the batching kettle, the discharge port of the batching kettle is connected with the feed inlet of the pyrolysis reaction kettle, the discharge port of the pyrolysis reaction kettle is connected with the feed inlet of the flash evaporation device, and the discharge port of the flash evaporation device is connected with the plate-and-frame filter press.
2. The system for treating the pyrolytic press filtrate of the excess sludge of the urban sewage plant according to claim 1, wherein: the bottom of the horizontal sedimentation tank is provided with a sludge scraping device, and a vertical inclined plate is connected to a frame of the sludge scraping device mounting scraper.
3. The system for treating the pyrolytic pressure filtrate of the excess sludge of the urban sewage plant according to claim 2, wherein: the two vertical inclined plates are connected in an X shape, and the wide surfaces of the vertical inclined plates are perpendicular to the advancing direction of the sludge scraping device.
4. The system for treating the pyrolytic pressure filtrate of the excess sludge of the urban sewage plant according to claim 2, wherein: the frame includes slip table, support and stopper, the both sides that the slip table is located the width direction of advection sedimentation tank are connected with support, stopper from interior to exterior setting respectively, be formed with between support and the stopper with the cell body lateral wall direction complex recess of advection sedimentation tank, the leg joint the scraper blade, the advection sedimentation tank top is provided with the lead screw that sets up along its length direction, the lead screw support is connected to the motor, the other end of lead screw, the lead screw support the motor respectively with the cell body length direction's of advection sedimentation tank both sides wall fixed connection, be equipped with on the lead screw with lead screw complex nut seat.
5. A method for treating pyrolysis press filtrate of excess sludge in a town sewage plant is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s01, mixing the press filtrate and sodium carbonate according to the weight ratio of 500: 2 is added into a filtrate dosing mixing pool, the stirring speed is 30r/min, and the retention time is 20 min;
s02, conveying the filter pressing liquid after the medicine is added in the step S01 to a horizontal flow sedimentation tank, wherein the moving speed of a vertical inclined plate and a scraper plate is 0.1-0.5 m/min, and the retention time is 3 h;
s03, conveying the supernatant of the horizontal flow sedimentation tank to a pH adjusting tank, adding concentrated sulfuric acid into the pH adjusting tank through a concentrated sulfuric acid storage tank by a pump, and adjusting the pH of the supernatant to 7.0-9.5;
the sediment in the sediment hopper of the horizontal sedimentation tank is conveyed to a filtering storage tank by a pump;
s04, concentrating the supernatant neutralized in the step S03 to obtain protein concentrated solution,
the sediment stored in the step S03 is conveyed to a batching kettle through a pump to be mixed with the sludge.
6. The method for treating the pyrolysis press filtrate of the excess sludge of the urban sewage plant according to claim 5, wherein the method comprises the following steps: the method for preparing the press filtrate comprises the following steps,
s11, mixing the sludge with water and lime with water content of 80% obtained by a sewage treatment plant according to the ratio of 10: 6: adding the mixture into a batching kettle according to the mass ratio of 0.65, preheating and uniformly stirring;
s12, adding the sludge mixture stirred in the step S11 into a reaction kettle, and reacting for 2 hours at 120 ℃;
s13, cooling the sludge mixture after the reaction in the step S12 to 60-80 ℃ through a flash evaporation device;
s14, the sludge mixture cooled in the step S13 enters a plate and frame system for filter pressing, and filter pressing liquid is obtained.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113979611A (en) * | 2021-11-23 | 2022-01-28 | 天津高能时代水处理科技有限公司 | Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113979611A (en) * | 2021-11-23 | 2022-01-28 | 天津高能时代水处理科技有限公司 | Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method |
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