CN111302579A - Sludge press filtrate resource utilization system and method - Google Patents
Sludge press filtrate resource utilization system and method Download PDFInfo
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- CN111302579A CN111302579A CN202010239434.2A CN202010239434A CN111302579A CN 111302579 A CN111302579 A CN 111302579A CN 202010239434 A CN202010239434 A CN 202010239434A CN 111302579 A CN111302579 A CN 111302579A
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- sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 92
- 239000000706 filtrate Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000018044 dehydration Effects 0.000 claims abstract description 17
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims description 27
- 229910001385 heavy metal Inorganic materials 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000002738 chelating agent Substances 0.000 claims description 8
- 239000000413 hydrolysate Substances 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000003337 fertilizer Substances 0.000 claims description 5
- 108010009736 Protein Hydrolysates Proteins 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 2
- 238000011221 initial treatment Methods 0.000 claims description 2
- 238000011282 treatment Methods 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 8
- 239000010865 sewage Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009283 thermal hydrolysis Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a resource utilization system and method of sludge press filtrate, which comprises a boiler heating steam conveying pipeline, a slurrying device, a chemical adding device, a preheater, a heater and dehydration equipment, wherein the outlet of the slurrying device is connected with the inlet of the chemical adding device; the boiler heating steam conveying pipeline is communicated with the heat release side of the heater, and the system and the method can realize resource utilization and harmless discharge of wet sludge.
Description
Technical Field
The invention belongs to the technical field of sludge waste liquid treatment, and relates to a sludge press filtrate resource utilization system and method.
Background
Along with the development demand of the country, the discharge of urban sewage and industrial sewage in the country is increased continuously, the number of sewage treatment plants is increased year by year, the increase of sewage treatment plants leads the total amount of sludge in the country to be in a rising trend, and the sludge treatment situation is very severe. Meanwhile, with the environmental protection importance of the state, the sludge treatment requires the realization of reduction, stabilization, harmlessness and reclamation of the sludge. The traditional sludge treatment means and method are gradually abandoned, so how to treat sludge cleanly, efficiently and reasonably becomes a problem to be solved urgently.
At present, one mode aiming at the harmless treatment of sludge is incineration, and an incineration method has the advantages of volume reduction, high weight reduction rate, high treatment speed, thorough harmless treatment, energy recycling and the like. The water content of the common municipal sludge is about 80 percent, and the high water content can not ensure the independent combustion of the sludge, so the water content of the sludge is reduced after the sludge is dried, and the sludge is mixed with other fuels for combustion for treatment. The current development is a faster mode, firstly, the sludge is dried, the moisture content of the sludge is reduced to about 40%, the dried sludge enters a large-capacity coal-fired power plant boiler for mixed combustion, and because the capacity of the coal-fired power generation boiler is large, the mixed combustion amount of the sludge is relatively small, environmental protection facilities of a large unit are utilized, so that harmless standard-reaching emission after the sludge mixed combustion is achieved. Meanwhile, sludge press filtration liquid is generated in the drying process, the part of the filtration liquid still contains harmful substances such as heavy metals, pathogenic bacteria and the like, secondary pollution is easily caused by direct discharge, meanwhile, most of the existing wastewater treatment plants adopt a biological and chemical method for treatment aiming at the sludge press filtration liquid, if the method is adopted for treatment, a set of sewage treatment system equipment needs to be invested independently, the method is high in investment cost, large in treatment difficulty and high in maintenance cost, and needs a specially-assigned person to carry out daily operation, and for the power plant, the method is high in cost and complex, and the feasibility is poor. Therefore, the sludge press filtrate is effectively treated in a targeted manner, the resource and harmless utilization and discharge of the sludge press filtrate are realized, and the sludge press filtrate is an important component for realizing the resource utilization of the sludge mixed combustion.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sludge press filtrate recycling system and a sludge press filtrate recycling method, which can realize recycling and harmless discharge of wet sludge.
In order to achieve the purpose, the sludge press filtrate resource utilization system comprises a boiler heating steam conveying pipeline, a slurrying device, a doser, a preheater, a heater and dewatering equipment.
The outlet of the slurrying device is connected with the inlet of the doser, the outlet of the doser is connected with the heat absorption side inlet of the preheater, the heat absorption side outlet of the preheater is connected with the heat absorption side inlet of the heater, the heat absorption side outlet of the heater is connected with the heat release side inlet of the preheater, the heat release side outlet of the preheater is connected with the inlet of the dewatering device, and the filtrate outlet of the dewatering device is connected with the inlet of the slurrying device;
the boiler heating steam delivery pipe is communicated with the heat release side of the heater.
The outlet of the doser is connected with the heat absorption side inlet of the preheater through a first-stage booster pump.
The heat absorption side outlet of the preheater is connected with the heat absorption side inlet of the heater through a secondary booster pump.
Adding a heavy metal chelating agent into the wet sludge through a doser.
The outlet of the heat release side of the heater is connected with a thermodynamic system of a power plant.
The resource utilization method of the sludge press filtrate comprises the following steps:
wet sludge is stirred by a slurrying device and silt is filtered, then the wet sludge enters a chemical adding device, heavy metal chelating agent is added into the wet sludge by the chemical adding device, heavy metals in the wet sludge are removed, the wet sludge is primarily treated, the wet sludge output by the chemical adding device enters the heat absorption side of the preheater for preheating, then enters the heat absorption side of the heater for heat exchange and temperature rise with high-temperature steam in the heat emission side of the heater, thereby hydrolyzing the wet sludge into hot hydrolysate, converting the hot hydrolysate into cold hydrolysate after heat release of the heat release side of the preheater, and then the sludge enters dehydration equipment for mechanical dehydration, pressure filtrate generated in the dehydration process of the dehydration equipment is sent into a pulpter for recycling, dried sludge generated in the dehydration process of the dehydration equipment is sent into a boiler for blending combustion, and concentrated solution generated in the dehydration process of the dehydration equipment is used as a liquid fertilizer so as to realize resource utilization of the sludge pressure filtrate.
The invention has the following beneficial effects:
the invention relates to a resource utilization system and method of sludge press filtrate, during specific operation, firstly, heavy metal chelating agent is added into wet sludge to enable the wet sludge to have basic conditions for utilization, secondly, power station boiler steam is used as a heat source in the low-temperature hydrolysis process of the wet sludge, meanwhile, a preheater is used for realizing multi-stage utilization and recovery of heat, so as to reduce energy consumption of the system, dried sludge produced after hydrolysis and cooling hydrolysate is dehydrated and dried by dehydration equipment enters a hearth of a power station boiler for blending combustion, so as to realize harmless treatment of the sludge, and simultaneously, generated concentrated solution is used as liquid fertilizer, and the generated press filtrate is sent into a slurrying device for recycling, so as to realize harmless and resource treatment of the sludge press filtrate, thereby avoiding the problems of poor applicability, high investment and the like of the traditional biochemical degradation method for treating press filtrate sewage.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a pulpifying device, 2 is a doser, 3 is a preheater, 4 is a heater, 5 is a dewatering device, 6 is a first-stage pressure pump, and 7 is a second-stage pressure pump.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the sludge press filtrate recycling system of the present invention includes a boiler heating steam delivery pipe, a slurry machine 1, a doser 2, a preheater 3, a heater 4, and a dewatering device 5; the outlet of the slurrying device 1 is connected with the inlet of the doser 2, the outlet of the doser 2 is connected with the heat absorption side inlet of the preheater 3, the heat absorption side outlet of the preheater 3 is connected with the heat absorption side inlet of the heater 4, the heat absorption side outlet of the heater 4 is connected with the heat release side inlet of the preheater 3, the heat release side outlet of the preheater 3 is connected with the inlet of the dewatering device 5, and the filtrate outlet of the dewatering device 5 is connected with the inlet of the slurrying device 1; the boiler heating steam delivery pipe is communicated with the heat release side of the heater 4.
The outlet of the doser 2 is connected with the heat absorption side inlet of the preheater 3 through a first-stage booster pump 6; the heat absorption side outlet of the preheater 3 is connected with the heat absorption side inlet of the heater 4 through a secondary booster pump 7; adding a heavy metal chelating agent into the wet sludge through a medicine adding device 2; the outlet of the heat release side of the heater 4 is connected with a thermodynamic system of a power plant.
The resource utilization method of the sludge press filtrate comprises the following steps:
wet sludge enters a chemical feeder 2 after being stirred and silt is filtered by a slurrying device 1, heavy metal chelating agent is added into the wet sludge through the chemical feeder 2 to remove heavy metal in the wet sludge, primary treatment of the wet sludge is completed, the wet sludge output by the chemical feeder 2 enters a heat absorption side of a preheater 3 to be preheated, then enters a heat absorption side of a heater 4 to exchange heat with high-temperature steam in a heat emission side of the heater 4 to heat up, the wet sludge is hydrolyzed into hot hydrolysate, the hot hydrolysate is converted into cold hydrolysate after heat emission by the heat emission side of the preheater 3 and then enters a dewatering device 5 to be mechanically dewatered, pressure filtrate generated in the dewatering process of the dewatering device 5 is sent into the slurrying device 1 to be reused, sludge generated in the dewatering process of the dewatering device 5 is sent into a boiler to be doped and burnt, and dried concentrated liquid generated in the dewatering process of the dewatering device 5 is used as liquid fertilizer, so as to realize the resource utilization of the sludge press filtrate.
It should be noted that, the invention removes the harmful heavy metal in the wet sludge by adding the metal chelating agent, so that the wet sludge has the basic condition for utilization, then the wet sludge is pressurized by a two-stage pressurizing pump, then the sludge molecules in the wet sludge are in liquid state by pressurizing and heating by adopting the low-temperature hydrothermal technology, so that the wet sludge is easier to dehydrate, then the sludge hydrolysate is dehydrated, the dehydrated product comprises the reuse press filtrate, the dried sludge and the concentrated solution, wherein the reuse press filtrate is output to the pulpter 1 by the dehydrating device 5 for reuse, the dried sludge is added into the boiler for burning, the concentrated solution is used as the liquid fertilizer, the whole system carries out heavy metal removal treatment on the wet sludge and pressurized thermal hydrolysis by using the heat source of the existing coal-fired power plant, the dehydrated product is comprehensively utilized in multiple stages according to different forms, thereby realizing the resource treatment and utilization of the sludge press filtrate.
The invention combines the equipment and the operation condition of the coal-fired power plant unit, properly modifies the existing coal-fired power plant unit, adds related treatment equipment, avoids the problems that the coal-fired power plant needs to perform investment on professional sewage treatment equipment, maintain and maintain by system experts and the like on the wastewater generated after sludge drying, realizes the scale of innoxious treatment, stabilization, resource utilization and greening of the sludge and the dried wastewater thereof, and has good social benefit and economic benefit for the coal-fired power plant. Meanwhile, the defects of complex process, long time and high cost of a biochemical method adopted for reaction in the traditional wastewater treatment process are overcome, the sludge press filtrate can be effectively treated, the process is simple, the time is short, secondary pollution is not easy to cause, and the energy consumption cost in the treatment process is low.
Claims (6)
1. A resource utilization system of sludge press filtrate is characterized by comprising a boiler heating steam conveying pipeline, a slurry device (1), a medicine adding device (2), a preheater (3), a heater (4) and dewatering equipment (5);
the outlet of the slurry feeder (1) is connected with the inlet of the slurry feeder (2), the outlet of the slurry feeder (2) is connected with the heat absorption side inlet of the preheater (3), the heat absorption side outlet of the preheater (3) is connected with the heat absorption side inlet of the heater (4), the heat absorption side outlet of the heater (4) is connected with the heat release side inlet of the preheater (3), the heat release side outlet of the preheater (3) is connected with the inlet of the dewatering equipment (5), and the filtrate outlet of the dewatering equipment (5) is connected with the inlet of the slurry feeder (1);
the boiler heating steam delivery pipeline is communicated with the heat release side of the heater (4).
2. The sludge press filtrate resource utilization system as claimed in claim 1, wherein an outlet of the doser (2) is connected with an inlet of a heat absorption side of the preheater (3) through a primary booster pump (6).
3. The sludge press filtrate resource utilization system as claimed in claim 2, wherein the outlet of the heat absorption side of the preheater (3) is connected with the inlet of the heat absorption side of the heater (4) through a secondary pressure pump (7).
4. The sludge press filtrate resource utilization system according to claim 2, wherein the heavy metal chelating agent is added into the wet sludge through the doser (2).
5. The sludge press filtrate resource utilization system as claimed in claim 2, wherein the outlet of the heat release side of the heater (4) is connected with a thermodynamic system of a power plant.
6. A resource utilization method of sludge press filtrate is characterized by comprising the following steps:
wet sludge enters the chemical adding device (2) after being stirred and silt is filtered by the slurry device (1), heavy metal chelating agent is added into the wet sludge through the chemical adding device (2) to remove heavy metal in the wet sludge, primary treatment of the wet sludge is completed, the wet sludge output by the chemical adding device (2) enters the heat absorption side of the preheater (3) to be preheated, then enters the heat absorption side of the heater (4) to exchange heat with high-temperature steam in the heat emission side of the heater (4) to heat and raise the temperature, so that the wet sludge is hydrolyzed into hot hydrolysate, the hot hydrolysate is converted into cold hydrolysate after being released heat by the heat emission side of the preheater (3), then enters the dehydration device (5) to be mechanically dehydrated, pressure filtrate generated in the dehydration process of the dehydration device (5) is sent into the slurry device (1) for recycling, and dried sludge generated in the dehydration process of the dehydration device (5) is sent into the boiler to be mixed and burned, the concentrated solution generated in the dehydration process of the dehydration equipment (5) is used as a liquid fertilizer to realize the resource utilization of the sludge press filtrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239434.2A CN111302579A (en) | 2020-03-30 | 2020-03-30 | Sludge press filtrate resource utilization system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239434.2A CN111302579A (en) | 2020-03-30 | 2020-03-30 | Sludge press filtrate resource utilization system and method |
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| CN111302579A true CN111302579A (en) | 2020-06-19 |
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| CN202010239434.2A Pending CN111302579A (en) | 2020-03-30 | 2020-03-30 | Sludge press filtrate resource utilization system and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160194231A1 (en) * | 2014-04-03 | 2016-07-07 | Xi'an Wonfu Energy And Environment Technologie Co., Ltd. | Sludge dehydrating system and method thereof based on thermal hydrolysis technology |
| CN108423959A (en) * | 2018-02-11 | 2018-08-21 | 浙江合泽环境科技股份有限公司 | A kind of Sludge resource utilization method based on pyrohydrolysis-pyrolysis charring |
| CN109626784A (en) * | 2019-02-26 | 2019-04-16 | 广西大学 | A kind of anticlogging sludge continuous thermal hydrolysis system |
| CN110526543A (en) * | 2019-09-20 | 2019-12-03 | 南京中电环保固废资源有限公司 | A kind of system and method coupling coal-fired incineration disposal suitable for sludge |
| CN211946729U (en) * | 2020-03-30 | 2020-11-17 | 西安西热锅炉环保工程有限公司 | Sludge press filtrate resource utilization system |
-
2020
- 2020-03-30 CN CN202010239434.2A patent/CN111302579A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160194231A1 (en) * | 2014-04-03 | 2016-07-07 | Xi'an Wonfu Energy And Environment Technologie Co., Ltd. | Sludge dehydrating system and method thereof based on thermal hydrolysis technology |
| CN108423959A (en) * | 2018-02-11 | 2018-08-21 | 浙江合泽环境科技股份有限公司 | A kind of Sludge resource utilization method based on pyrohydrolysis-pyrolysis charring |
| CN109626784A (en) * | 2019-02-26 | 2019-04-16 | 广西大学 | A kind of anticlogging sludge continuous thermal hydrolysis system |
| CN110526543A (en) * | 2019-09-20 | 2019-12-03 | 南京中电环保固废资源有限公司 | A kind of system and method coupling coal-fired incineration disposal suitable for sludge |
| CN211946729U (en) * | 2020-03-30 | 2020-11-17 | 西安西热锅炉环保工程有限公司 | Sludge press filtrate resource utilization system |
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