CN106630356B - Sludge incineration boiler flue gas desulfurization waste water zero release processing system - Google Patents
Sludge incineration boiler flue gas desulfurization waste water zero release processing system Download PDFInfo
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- CN106630356B CN106630356B CN201710029944.5A CN201710029944A CN106630356B CN 106630356 B CN106630356 B CN 106630356B CN 201710029944 A CN201710029944 A CN 201710029944A CN 106630356 B CN106630356 B CN 106630356B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention relates to a zero-discharge treatment system for flue gas desulfurization wastewater of a sludge incineration boiler, belonging to the technical field of wastewater treatment. The device comprises a multi-effect evaporation device, a coagulation device and a filtering device which are connected in sequence; the coagulation device is also connected with a dosing device; the multi-effect evaporation plant takes off the inorganic salt in the waste water, the device that thoughtlessly congeals adjusts waste water pH value to neutral or weak basicity and turns into the heavy metal ion complex and carry out coagulating sedimentation, charge device is responsible for forgetting to add the medicine in the coagulation device, filter equipment is responsible for carrying out mud-water separation with the waste water that reaches the index. The invention can be used for treating the flue gas desulfurization wastewater of the sludge incineration boiler, the wastewater passes through the multi-effect evaporation device, the coagulation device and the filtering device in sequence and is matched with the dosing device, the quality of the treated wastewater can be effectively improved, and the wastewater can reach the standard of recycling, thereby realizing the zero discharge of the wastewater.
Description
Technical Field
The invention relates to a zero-discharge treatment system for flue gas desulfurization wastewater of a sludge incineration boiler, belonging to the technical field of wastewater treatment.
Background
With the rapid development of sewage treatment technology, the problem of water environment pollution once restricting the economic development of China is greatly improved, but the sludge generated in the sewage treatment process contains heavy metals, pathogenic microorganisms and other harmful substances due to large amount and viscous property, and can bring serious secondary pollution to the environment if the sludge is not properly treated.
Sludge incineration is one of the main methods of current sludge treatment technologies. The sludge incineration process can effectively reduce sludge, sludge in daily sewage stations can be incinerated in a sludge incineration boiler after being dried by a sludge drying production line, and then the flue gas generated by incineration can reach the emission standard after being subjected to desulfurization treatment, and the waste water after the flue gas is treated also needs to be reprocessed so as to achieve the purpose of protecting the environment.
In the prior art, the treatment system of the desulfurization wastewater is only applicable to the desulfurization wastewater generated by a thermal power plant, and the treatment system of the wastewater generated by the flue gas desulfurization of a fluidized bed boiler for incinerating sludge is not available.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a zero-discharge treatment system for flue gas desulfurization wastewater of a sludge incineration boiler.
The technical scheme adopted by the invention for solving the problems is as follows: a sludge incineration boiler flue gas desulfurization wastewater zero-discharge treatment system comprises a multi-effect evaporation device, a coagulation device and a filtering device which are sequentially connected; the coagulation device is also connected with a dosing device; the multi-effect evaporation plant takes off the inorganic salt in the waste water, the device that thoughtlessly congeals adjusts waste water pH value to neutral or weak basicity and turns into the heavy metal ion complex and carry out coagulating sedimentation, charge device is responsible for forgetting to add the medicine in the coagulation device, filter equipment is responsible for carrying out mud-water separation with the waste water that reaches the index.
Furthermore, the multi-effect evaporation plant comprises a desulfurization waste water regulating reservoir and a multi-phase distillation mechanism which are connected in sequence, and waste water is lifted to the multi-phase distillation mechanism from the desulfurization waste water regulating reservoir through a booster pump. Wastewater waiting for treatment firstly enters a desulfurization wastewater adjusting tank, is lifted to a multiphase distillation mechanism under the action of a booster pump, a large amount of inorganic salt in the wastewater can be removed by introducing steam into the multiphase distillation mechanism, and the used waste enters a subsequent waste gas treatment system for treatment.
Furthermore, an intermediate water tank is arranged between the multi-effect evaporation device and the coagulation device, and wastewater in the intermediate water tank is lifted into the coagulation device through a centrifugal pump. The middle water tank can provide certain buffering time for the system, the wastewater treated by the multi-effect evaporation device can enter the middle water tank firstly to wait for subsequent treatment instead of directly reaching the coagulation device, and sufficient reaction time is provided for the wastewater in the coagulation device, so that the wastewater can be treated more fully in the coagulation device, and the treatment effect of the whole system is improved.
Furthermore, the coagulation device comprises a first-stage reaction box, a second-stage reaction box and a third-stage reaction box which are sequentially connected and communicated, and stirring equipment is arranged in each reaction box. The three reaction boxes can respectively carry out different treatments, and the stirring of the stirring equipment is helpful for the reaction to be carried out more quickly and thoroughly.
Further, the medicine adding device comprises a first medicine adding device, a second medicine adding device and a third medicine adding device; lime is stored in the first dosing device and is connected with the first-stage reaction box, a heavy metal capturing agent is stored in the second dosing device and is connected with the second-stage reaction box, and a coagulant aid are stored in the third dosing device and are connected with the third-stage reaction box. The three medicine adding devices respectively store different medicines and can be correspondingly put into the three reaction boxes.
Further, filter equipment is including the clarification concentrate tank, desulfurization waste water sludge impoundment and the pressure filter that connect gradually, still communicate behind the clarification concentrate tank has the valveless filtering pond, desulfurization waste water sludge impoundment is squeezed into the pressure filter with mud through the sludge pump. The wastewater treated by the coagulation device reaches a clarification concentration tank, supernatant liquid is directly communicated to a valveless filter for final filtration and then can be recycled, and sludge enters a desulfurization wastewater sludge tank and is pressed into sludge cakes by a filter press.
Compared with the prior art, the invention has the following advantages and effects: the invention can be used for treating the flue gas desulfurization wastewater of the sludge incineration boiler, the wastewater passes through the multi-effect evaporation device, the coagulation device and the filtering device in sequence and is matched with the dosing device, the quality of the treated wastewater can be effectively improved, and the wastewater can reach the standard of recycling, thereby realizing the zero discharge of the wastewater.
Drawings
Fig. 1 is a schematic structural diagram of a multi-effect evaporation device and an intermediate water tank.
FIG. 2 is a schematic structural view of the coagulation apparatus of the present invention.
FIG. 3 is a schematic structural view of the drug adding device of the present invention.
FIG. 4 is a schematic view of the structure of the filtering apparatus of the present invention.
FIG. 5 shows the contents of substances in wastewater before treatment in this example.
FIG. 6 shows the contents of substances in the wastewater treated in this example.
In the drawings: 1 is desulfurization waste water equalizing basin, 2 is heterogeneous distillation mechanism, 3 is the booster pump, 4 is the distillation retort, 5 is middle pond, 6 is the centrifugal pump, 7 is the one-level reaction case, 8 is the second grade reaction case, 9 is tertiary reaction case, 10 is agitated vessel, 11 is charge device No. one, 12 is charge device No. two, 13 is charge device No. three, 14 is the clarification concentrated pond, 15 is desulfurization waste water sludge impoundment, 16 is the pressure filter, 17 is the valveless filtering pond.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1-4, the present embodiment includes a multiple-effect evaporation device, a coagulation device and a filtering device, which are connected in sequence, and the coagulation device is further connected with a dosing device.
The multi-effect evaporation plant comprises a desulfurization waste water regulating tank 1 and a multiphase distillation mechanism 2 which are connected in sequence, and waste water is lifted to the multiphase distillation mechanism 2 from the desulfurization waste water regulating tank 1 through a booster pump 3.
The multiphase distillation mechanism 2 comprises three distillation tanks 4 which are communicated through pipelines. Every distillation case 4 all includes upper and lower two imports and upper and lower two exports, and wherein two imports all set up on the side box of distillation case 4, and the upper outlet setting is at 4 box tops of distillation case, and the export is then set up in 4 box bottoms of distillation case down. The wastewater lifted up by the booster pump 3 is first introduced into the upper inlet of the first distillation tank 4, and the steam is introduced into the multiphase distillation mechanism 2 from the lower inlet of the first distillation tank 4. After treatment, the wastewater is led from the lower outlet of the first distillation box 4 to the upper inlet of the second distillation box 4, and the steam is led from the upper outlet of the first distillation box 4 to the lower inlet of the second distillation box 4. After treatment, the waste water and steam are again fed to the third distillation tank 4 as described above. Through the treatment of the third distillation box 4, the waste gas enters a subsequent waste treatment system for treatment, and a large amount of inorganic salt is removed from the waste water and enters an intermediate water tank 5.
The middle water tank 5 is arranged between the multiple-effect evaporation device and the coagulation device, so that certain buffering time can be provided for the system, the wastewater treated by the multiple-effect evaporation device can enter the middle water tank 5 firstly to wait for subsequent treatment instead of directly reaching the coagulation device, and sufficient reaction time of the wastewater in the coagulation device is provided, so that the wastewater can be treated more fully in the coagulation device, and the treatment effect of the whole system is improved.
The waste water in the intermediate water tank 5 is lifted into the coagulation device by the centrifugal pump 6.
The coagulation device comprises a first-stage reaction box 7, a second-stage reaction box 8 and a third-stage reaction box 9 which are sequentially connected and communicated, wherein stirring equipment 10 is arranged in each reaction box, and the stirring equipment 10 is corrosion-resistant.
The medicine adding device comprises a first medicine adding device 11, a second medicine adding device 12 and a third medicine adding device 13 which are respectively and correspondingly communicated with the first-stage reaction box 7, the second-stage reaction box 8 and the third-stage reaction box 9, and medicines are added into the reaction boxes through the medicine adding pumps. Lime is stored in the first chemical adding device 11, and the pH value of the wastewater in the first-stage reaction tank 7 can be adjusted to be neutral or slightly acidic. The second chemical adding device 12 is internally stored with a TMT-15 brand water treatment agent, and is put into the second-stage reaction box 8, so that heavy metal ions in the neutralized wastewater can be converted into a complex which is difficult to dissolve. Coagulant and coagulant aid are stored in the third dosing device 13, and are put into the third-stage reaction tank 9, so that alum floc in the wastewater can be gathered to generate larger alum floc, and subsequent precipitation is facilitated.
The filtering device comprises a clarification and concentration tank 14, a desulfurization wastewater sludge tank 15 and a filter press 16 which are connected in sequence, and a valveless filter tank 17 is communicated behind the clarification and concentration tank 14. The wastewater treated by the coagulation device reaches a clarification concentration tank 14, and supernatant liquid is directly sent to a valveless filter 17 for final filtration and then can be recycled. The sludge enters a desulfurization wastewater sludge pool 15, then is pressed into a mud cake by a filter press 16, and the redundant wastewater filtrate flows back to the desulfurization wastewater adjusting pool 1 for retreatment.
The desulfurization wastewater treatment process comprises the following steps:
1) a desulfurization wastewater adjusting tank: and collecting the flue gas desulfurization wastewater of the sludge incineration boiler, and homogenizing and uniformly measuring.
2) Multiphase distillation apparatus: the steam is used for providing heat to distill the desulfurization waste water by being lifted by a booster pump 3 and entering a multiphase distillation device, and a large amount of inorganic salt in the desulfurization waste water is removed.
3) A middle water tank: the effluent of the multiphase distillation device automatically flows into an intermediate water tank 5, and the intermediate water tank 5 performs an intermediate storage function for the subsequent lifting of a centrifugal pump 6.
4) A first-stage reaction box: adding lime for reaction, adjusting the pH value of the wastewater to be neutral or slightly alkaline, and arranging a corrosion-resistant stirring device 10 in the middle to ensure that the lime and the wastewater fully react.
5) A secondary reaction box: and adding a heavy metal catching agent into the neutralized wastewater, and fully reacting the agent with the wastewater by using a stirring facility to convert heavy metal ions into an insoluble complex.
6) A third-stage reaction box: coagulant and coagulant aid are added to aggregate alum floc in the wastewater to generate large alum floc, which is beneficial to subsequent precipitation.
7) A clarification and concentration tank: the centrifugal pump 6 is arranged at the bottom of the third-stage reaction box 9, and the waste water mixed with the medicament is lifted to enter the clarification concentration tank 14 for reaction, and then the waste water is subjected to mud-water separation.
8) A valveless filter: the supernatant effluent of the clarification and concentration tank 14 automatically flows into the valveless filter 17, and the residual particles are filtered by using the filtering facilities in the valveless filter 17, so that the aim of better mud-water separation is fulfilled.
9) The effluent is reused in a desulfurization treatment system.
10) Desulfurization wastewater sludge pond: the residual sludge discharged from the sedimentation concentration tank is stored and pumped into a filter press 16 by a sludge pump for filter pressing, the mud cakes are transported to a designated place for treatment by qualified solid waste treatment factories, and the filtered water flows back to the regulating tank for retreatment. The contents of substances in the wastewater before and after the treatment are shown in FIGS. 5 and 6.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a sludge incineration boiler flue gas desulfurization waste water zero release processing system which characterized in that: comprises a multi-effect evaporation device, a coagulation device and a filtering device which are connected in sequence; the coagulation device is also connected with a dosing device; the multiple-effect evaporation device removes inorganic salt in the wastewater, the coagulation device adjusts the pH value of the wastewater to be neutral or slightly alkaline and converts heavy metal ions into a complex for coagulation and precipitation, the dosing device is responsible for adding drugs into the coagulation device, and the filtering device is responsible for carrying out mud-water separation on the wastewater reaching the index; an intermediate water tank is also arranged between the multi-effect evaporation device and the coagulation device, and wastewater in the intermediate water tank is lifted into the coagulation device through a centrifugal pump; the medicine adding device comprises a first medicine adding device, a second medicine adding device and a third medicine adding device; lime is stored in the first dosing device and is connected with the first-stage reaction tank, a TMT-15 water treatment agent and a TMT-15 heavy metal capture agent are stored in the second dosing device and are connected with the second-stage reaction tank, and a coagulant aid are stored in the third dosing device and are connected with the third-stage reaction tank;
the emission treatment system adopts the following method:
(1) collecting the flue gas desulfurization wastewater of the sludge incineration boiler to a desulfurization wastewater adjusting tank,
(2) lifting the desulfurization wastewater in the step (1) into a multi-effect evaporation device, providing heat by using steam to distill the desulfurization wastewater, removing a large amount of inorganic salt in the desulfurization wastewater,
(3) the effluent of the multiphase distillation device automatically flows into and is stored in an intermediate water tank,
(4) lime is added into the first-stage reaction box through a first dosing device, the pH value of the wastewater is adjusted to be neutral or slightly alkaline, then the wastewater flows into a second reaction box,
(5) adding TMT-15 water treatment agent and TMT-15 heavy metal capture agent into the second-stage reaction box through a second dosing device to convert heavy metal ions into insoluble complex, stirring for full reaction, allowing the wastewater to flow into a third-stage reaction box,
(6) coagulant and coagulant aid are added into the three-stage reaction tank through a third dosing device, so that alum floc in the wastewater is gathered to generate large alum floc,
(7) lifting the wastewater mixed with the medicament in the third-stage reaction tank into a clarification concentration tank for wastewater sludge-water separation,
(8) after filtering the residual particles by the valveless filter, the effluent is reused in a desulfurization treatment system, the residual sludge discharged by the precipitation concentration tank is stored, the residual sludge is pumped into a filter press by a sludge pump for filter pressing, the mud cake is transported to a designated place for treatment by a qualified solid waste treatment factory, and the filtered water flows back to the regulating tank for retreatment.
2. The sludge incineration boiler flue gas desulfurization wastewater zero-discharge treatment system of claim 1, characterized in that: the multi-effect evaporation plant comprises a desulfurization waste water adjusting tank and a multiphase distillation mechanism which are connected in sequence, and waste water is lifted to the multiphase distillation mechanism from the desulfurization waste water adjusting tank through a booster pump.
3. The sludge incineration boiler flue gas desulfurization wastewater zero-discharge treatment system of claim 1, characterized in that: the coagulation device comprises a first-stage reaction box, a second-stage reaction box and a third-stage reaction box which are sequentially connected and communicated, and stirring equipment is arranged in each reaction box.
4. The sludge incineration boiler flue gas desulfurization wastewater zero-discharge treatment system of claim 1, characterized in that: the filter device comprises a clarification concentration tank, a desulfurization wastewater sludge tank and a filter press which are sequentially connected, wherein the clarification concentration tank is communicated with a valveless filter tank, and the desulfurization wastewater sludge tank pumps sludge into the filter press through a sludge pump.
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| CN201710029944.5A CN106630356B (en) | 2017-01-12 | 2017-01-12 | Sludge incineration boiler flue gas desulfurization waste water zero release processing system |
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| CN201710029944.5A CN106630356B (en) | 2017-01-12 | 2017-01-12 | Sludge incineration boiler flue gas desulfurization waste water zero release processing system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082639A (en) * | 1990-11-06 | 1992-01-21 | Dravo Lime Company | Sulfur dioxide removal from gases using a modified lime |
| CN101746874A (en) * | 2010-02-04 | 2010-06-23 | 武汉中新化工有限公司 | Processing method of wastewater desulfurized by fume wet method |
| CN105523677A (en) * | 2016-01-27 | 2016-04-27 | 成都锐思环保技术股份有限公司 | Treatment system capable of realizing zero discharge of desulfurization wastewater |
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2017
- 2017-01-12 CN CN201710029944.5A patent/CN106630356B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082639A (en) * | 1990-11-06 | 1992-01-21 | Dravo Lime Company | Sulfur dioxide removal from gases using a modified lime |
| CN101746874A (en) * | 2010-02-04 | 2010-06-23 | 武汉中新化工有限公司 | Processing method of wastewater desulfurized by fume wet method |
| CN105523677A (en) * | 2016-01-27 | 2016-04-27 | 成都锐思环保技术股份有限公司 | Treatment system capable of realizing zero discharge of desulfurization wastewater |
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Address after: 311201 Hangzhou, Xiaoshan District, Zhejiang Province Road No. 288 show Patentee after: Hangzhou Research Institute Co.,Ltd. Address before: 311201 Hangzhou, Xiaoshan District, Zhejiang Province Road No. 288 show Patentee before: CHINA COAL TECHNOLOGY & ENGINEERING GROUP HANGZHOU ENVIRONMENTAL PROTECTION INSTITUTE Co.,Ltd. |