CN211871618U - Device for treating desulfurization wastewater by composite method - Google Patents
Device for treating desulfurization wastewater by composite method Download PDFInfo
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- CN211871618U CN211871618U CN201922007522.5U CN201922007522U CN211871618U CN 211871618 U CN211871618 U CN 211871618U CN 201922007522 U CN201922007522 U CN 201922007522U CN 211871618 U CN211871618 U CN 211871618U
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Abstract
The utility model discloses a device of desulfurization waste water is handled to complex method, including header unit, clarification unit, reaction unit, precipitation unit and filter unit, the header unit includes header and medicine system I, the clarification unit includes depositing reservoir and sludge dewaterer I, the reaction unit includes medicine system II and reaction tank, the precipitation unit includes sedimentation tank and sludge dewaterer II, the filter unit includes filter equipment and clean water basin, and header, depositing reservoir, reaction tank, sedimentation tank, filter equipment and clean water basin are connected in proper order, and medicine system I is connected with the header, and sludge dewaterer I is connected with the depositing reservoir, and medicine system II is connected with the reaction tank, and sludge dewaterer II is connected with the depositing reservoir. The utility model provides a sulfate radical ion concentration in the effluent problem that exceeds standard. And part of sludge generated after the desulfurization wastewater is treated by the device can be recycled and sold for use as a concrete expanding agent, thereby providing good economic benefit for power plants.
Description
Technical Field
The utility model relates to a waste water treatment of power plant, in particular to a device for treating desulfurization waste water by a composite method.
Background
The desulfurization wastewater is the discharge water of an absorption tower in the wet desulfurization (limestone/gypsum method) process of boiler flue gas of a coal-fired power plant, and has the characteristics of high concentration of suspended matters, high salt content, heavy metal ions and the like. After the desulfurization wastewater is treated, the water quality is permitted to be discharged only after the water quality reaches the standard of limestone-gypsum wet desulfurization wastewater control index of thermal power plants. At present, most of processes adopted by coal-fired power plants for treating desulfurization wastewater are as follows: the regulating tank → the triple box → the clarification tank → the neutralization tank → the recycling or discharging, wherein the medicaments added in the triple box mainly comprise iron salt, organic sulfur and lime milk. However, in actual operation, because the removal rate of the sulfate ions by the process is low, the concentration of the sulfate ions in the effluent of most of the running desulfurization wastewater treatment systems is much higher than the discharge value. In order to reduce the concentration of sulfate ions in the effluent, the utility model provides a device for treating desulfurization wastewater by a composite method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device of desulfurization waste water is handled to complex method, the sulfate radical ion in the effluent that is handled through this device can reach emission standard, has solved the problem that the sulfate radical ion concentration in the effluent exceeds standard. And the sludge produced after the desulfurization wastewater is treated by the method can be recycled and sold for use as a concrete expanding agent, thereby providing good economic benefit for power plants.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a desulfurization waste water's device is handled to compound method, includes header unit, clarification unit, reaction unit, precipitation unit and filter unit, the header unit includes header and medicine system I, the clarification unit includes depositing reservoir and sludge dewaterer I, the reaction unit includes medicine system II and reaction tank, the precipitation unit includes depositing reservoir and sludge dewaterer II, the filter unit includes filter equipment and clean water basin, and header unit, depositing reservoir, reaction tank, depositing reservoir, filter equipment and clean water basin are connected gradually, and medicine system I is connected with the header, and sludge dewaterer I is connected with the depositing reservoir, and medicine system II is connected with the reaction reservoir, and sludge dewaterer II is connected with the depositing reservoir.
According to the device for treating desulfurization wastewater by using the composite method, the three headers comprise the first box, the second box and the third box, the first box, the second box and the third box are sequentially connected, the dosing system I comprises a lime milk dosing device, an organic sulfur dosing device and an iron salt dosing device, the first box is connected with the lime milk dosing device, the second box is connected with the organic sulfur dosing device, and the third box is connected with the iron salt dosing device.
According to the device for treating desulfurization wastewater by using the composite method, the dosing system II comprises a sodium hydroxide dosing device and an aluminum salt dosing device, the sodium hydroxide dosing device is connected with the reaction tank, and the aluminum salt dosing device is connected with the reaction tank.
In the device for treating desulfurization wastewater by using the composite method, the filter is arranged in the filtering device.
In the device for treating desulfurization wastewater by using the composite method, the filter is a quartz sand filter.
The method for treating the desulfurization wastewater by adopting the composite method comprises the following steps
(1) Adding lime milk, organic sulfur and ferric salt into the triple box, and adjusting the pH value of the desulfurization wastewater in the triple box to 9.2-9.5;
(2) allowing the desulfurization wastewater treated in the step (1) to enter a clarification tank for gravity separation to remove suspended matters and metal ions;
(3) enabling the desulfurization wastewater treated in the step (2) to enter a reaction tank, and adding sodium hydroxide and aluminum salt into the reaction tank;
(4) enabling the desulfurization wastewater treated in the step (3) to enter a sedimentation tank to obtain precipitated sludge and supernatant, discharging the precipitated sludge out of the sedimentation tank through a sludge pump, enabling the precipitated sludge to enter a sludge dewatering machine II, and recycling or selling the sludge treated by the sludge dewatering machine II; the supernatant is discharged from the sedimentation tank and enters a filtering unit, and the treated water passing through the filtering unit is discharged or recycled.
In the method for treating desulfurization wastewater by using a composite method, in the step (3), sodium hydroxide is added into the reaction tank, and the pH value of the desulfurization wastewater in the reaction tank is adjusted.
In the method for treating desulfurization wastewater by using a composite method, in the step (3), sodium hydroxide is added to adjust the pH value to 10.5～11。
In the step (3), aluminum salt is added into the reaction tank, and calcium ions and sulfate ions in the desulfurization wastewater are precipitated and separated out when the pH value is 10.5-11.
In the method for treating desulfurization wastewater by using a composite method, in the step (3), the amount of aluminum salt added is 0.6 times of the concentration of sulfate ions in the desulfurization wastewater in the reaction tank.
In the step (3), after sodium hydroxide and aluminum salt are added into the reaction tank, the reaction time of the desulfurization wastewater in the reaction tank and the sodium hydroxide and the aluminum salt is 25～For 30 minutes.
In the method for treating desulfurization wastewater by using a composite method, in the step (4), the precipitated sludge mainly comprises ettringite (Ca)6Al2(SO4)3(OH)1226H2O)。
Compared with the prior art, the utility model discloses a sodium hydroxide charge device and aluminium salt charge device that link to each other with the reaction tank drop into in the reaction tank that medicine sodium hydroxide and aluminium salt reduce the sulfate radical ion concentration of aquatic, have solved the problem that the sulfate radical ion concentration in the effluent exceeds standard. And the sludge produced after the desulfurization wastewater is treated by the device can be recycled and sold for use as a concrete expanding agent, thereby providing good economic benefit for power plants.
Drawings
FIG. 1 is a schematic flow chart of a method for treating desulfurization wastewater by a composite method.
FIG. 2 is a schematic view of the flow of the device for treating desulfurization wastewater by a composite method
The meaning of the reference numerals: 1-clarification tank 2-sludge dewatering machine I3-sodium hydroxide dosing device 4-reaction tank 5-sedimentation tank 6-sludge dewatering machine II 7-filtering device 8-clean water tank 9-first tank 10-second tank 11-third tank 12-lime milk dosing device 13-organic sulfur dosing device 14-iron salt dosing device 15-aluminum salt dosing device 16-rotary mud scraper 17-inclined plate 18-stirring machine 19-rapid stirring machine
The present invention will be further described with reference to fig. 1 and 2 and the following detailed description.
Detailed Description
As shown in fig. 1 and 2, a device for treating desulfurization wastewater by a composite method comprises a triple box unit, a clarification unit, a reaction unit, a precipitation unit and a filtering unit, wherein the triple box unit comprises a triple box and a dosing system I, the clarification unit comprises a clarification tank 1 and a sludge dewatering machine I2, the reaction unit comprises a dosing system II and a reaction tank 4, the precipitation unit comprises a sedimentation tank 5 and a sludge dewatering machine II6, the filtering unit comprises a filtering device 7 and a clean water tank 8, the triple box, the clarification tank 1, the reaction tank 4, the sedimentation tank 5, the filtering device 7 and the clean water tank 8 are sequentially connected, the dosing system I is connected with the triple box, the sludge dewatering machine I6 is connected with the clarification tank 1, the dosing system II is connected with the reaction tank 4, and the sludge dewatering machine II6 is connected with the sedimentation tank 5. The desulfurization wastewater enters an adjusting tank and is lifted to a triple box through a water pump, lime milk, organic sulfur and ferric salt are added through a drug adding system I connected with the triple box, and the pH is adjusted to 9.2-9.5, so that metal ions, mercury, lead, fluorine and the like in the wastewater form flocs and alumen ustum. And the desulfurization wastewater treated by the triple box enters a clarification tank 1. The clarification tank 1 is mainly used for settling and separating suspended matters and flocs in the wastewater, and particles and suspensions with larger specific gravity in the wastewater under the action of gravityThe material and larger flocs sink to the bottom of the clarifier 1. The clarifier 1 is provided with a rotary sludge scraper 16 for preventing sludge from hardening at the bottom of the clarifier while promoting sludge concentration. After the desulfurization wastewater treated by the triple box is subjected to gravity separation in the clarification tank 1, effluent indexes such as suspended matters and metal ions meet the requirement of discharge indexes, the effluent indexes enter the reaction tank 4 for reaction, and the precipitated sludge is subjected to sludge dewatering and drying by the sludge dewatering machine I2 and then is transported outside. The sludge dewatering machine I2 is used for removing a large amount of water in sludge, so that the volume of the sludge is reduced, the weight of the sludge is reduced, the water content of the sludge can be reduced to 80-60% from about 95% through dewatering under normal conditions, and the volume of the sludge is reduced to 1/4-1/8 before dewatering. The effluent clarified by the clarification tank 1 enters a reaction tank 4 in a reaction unit, sodium hydroxide and aluminum salt are added into the reaction tank 4 through a drug adding system II, the pH value of the wastewater is controlled to be 10.5-11, the reaction time is 25-30 min, the effluent of the reaction tank 4 enters a sedimentation tank 5 in a sedimentation unit, an inclined plate 17 is arranged in the sedimentation tank 5, the influent water is uniformly distributed on the whole area of the inclined plate 17, the water flow is ensured not to be short-circuited, the sedimentation is finished under the optimal state, and the sedimentation time is longer than 60 min. The sludge at the lower part of the sedimentation tank 5 is discharged by a pump to a sludge dewatering machine II6, the main function of the sludge dewatering machine II6 is to remove a large amount of water in the sludge, so that the volume of the sludge is reduced, the weight of the sludge is reduced, generally, the water content of the sludge is reduced to 80-60% from about 95% after the sludge is dewatered, and the volume of the sludge is reduced to 1/4-1/8 before the sludge is dewatered. The main component of the sludge precipitated in the precipitation unit is ettringite (Ca)6Al2(SO4)3(OH)1226H2O), the main component of which is ettringite (Ca)6Al2(SO4)3(OH)1226H2O) sludge can be recycled and sold for use as a concrete expanding agent, thereby providing good economic benefits for power plants. Supernatant effluent of the sedimentation tank 5 enters a filtering device 7 in a filter unit, and the filtering device 7 is provided with a quartz sand filter or other filters to further remove suspended matters in water, so that the effluent reaches the recycling and discharge standards. After passing through the filtering device 7, the water enters a clean water tank 8 with a water storage function, the concentration of sulfate radicals in the outlet water of the clean water tank 8 is less than 200mg/L, the concentration of calcium ions is less than 150mg/L, and the outlet water can be reusedEach water consumption point reduces the burden of a subsequent desulfurization wastewater advanced treatment system.
As shown in fig. 1 and 2, the device for treating desulfurization wastewater by using a composite method comprises a first tank 9, a second tank 10 and a third tank 11, wherein the first tank 9, the second tank 10 and the third tank 11 are sequentially connected, the dosing system I comprises a lime milk dosing device 12, an organic sulfur dosing device 13 and an iron salt dosing device 14, the first tank 9 is connected with the lime milk dosing device 12, the second tank 9 is connected with the organic sulfur dosing device 13, and the third tank 11 is connected with the iron salt dosing device 14. The desulfurization wastewater is sent into the first tank 9 by a wastewater lifting pump to carry out neutralization reaction, then flows into the second tank 10 in sequence to carry out reaction, and finally enters the third tank 11 to carry out flocculation. In view of the compact arrangement and saving on process flow, the first tank 9, the second tank 10 and the third tank 11 are combined into an integrated reactor, called a triple tank, and the tanks are separated by a partition plate. In order to make the wastewater fully contact with the medicament for reaction, the hydraulic retention time of each reaction box is more than 30min, and the stirrer 18 is matched to promote the reaction. After the desulfurization wastewater enters the first tank 9, calcium hydroxide is added into the first tank 9 through a lime milk dosing device 12 connected with the first tank 9 to adjust the pH value to 9.2-9.5, so that most metal ions in the desulfurization wastewater are separated out in the form of hydroxide, and fine colloidal floc is formed in water. Then organic sulfur TMT-15 is added into the second box 10 through an organic sulfur dosing device 13 connected with the second box 10, so that Hg, Cd, Pb and other substances which are difficult to be precipitated in hydroxide form and Al3+、Fe3+The onium hydroxide being amphoteric ion with S2-The combination is separated out in the form of sulfide to form flocs. And finally, adding iron salt and coagulant aid into the third box 11 through an iron salt dosing device 14 connected with the third box 11 to enable the fine suspended matters, the colloidal particles and the like to be mutually coagulated and combined to form larger alum floc which is easy to precipitate and remove.
As shown in fig. 1 and 2, the chemical adding system II includes a sodium hydroxide chemical adding device 3 and an aluminum salt chemical adding device 15, the sodium hydroxide chemical adding device 3 is connected with the reaction tank 4, and the aluminum salt chemical adding device 15 is connected with the reaction tank 4. The sodium hydroxide dosing device 3 and the aluminum salt dosing device 15 are used for adding sodium hydroxide and aluminum salt into the reaction tank 4, and the reaction tank 4 is internally provided with a rapid stirrer 19 which is used for rapidly mixing the water fed into the reaction tank 4 with the sodium hydroxide and the aluminum salt so as to achieve the purpose of accelerating the reaction of the fed water with the sodium hydroxide and the aluminum salt.
As shown in fig. 1 and 2, a filter is arranged in the filtering device 7 to further remove suspended matters in the supernatant liquid precipitated by the sedimentation tank, so that the effluent water reaches the recycling and discharging standards. Further, the filter is a quartz sand filter. The quartz sand filter is commonly used for removing suspended matters and solid matters in industrial wastewater. In this embodiment, a quartz sand filter is selected because suspended solids and solid substances in industrial wastewater need to be further removed.
Claims (5)
1. The utility model provides a device of desulfurization waste water is handled to compound method, its characterized in that, includes header tank unit, clarification unit, reaction unit, precipitation unit and filter unit, the header tank unit includes header tank and medicine system I, clarification unit includes depositing reservoir (1) and sludge dewaterer I (2), reaction unit includes medicine system II and reaction tank (4), precipitation unit includes sedimentation tank (5) and sludge dewaterer II (6), filter unit includes filter equipment (7) and clear water basin (8), and header tank, depositing reservoir (1), reaction tank (4), sedimentation tank (5), filter equipment (7) and clear water basin (8) are connected gradually, and medicine system I is connected with the header tank, and sludge dewaterer I (2) are connected with depositing reservoir (1), and medicine system II is connected with reaction tank (4), the sludge dewatering machine II (6) is connected with the sedimentation tank (5).
2. The device for treating desulfurization wastewater by a composite method according to claim 1, wherein the triple box comprises a first box (9), a second box (10) and a third box (11), the first box (9), the second box (10) and the third box (11) are sequentially connected, the dosing system I comprises a lime milk dosing device (12), an organic sulfur dosing device (13) and an iron salt dosing device (14), the first box (9) is connected with the lime milk dosing device (12), the second box (10) is connected with the organic sulfur dosing device (13), and the third box (11) is connected with the iron salt dosing device (14).
3. The device for treating desulfurization wastewater by a composite method according to claim 1, wherein the dosing system II comprises a sodium hydroxide dosing device (3) and an aluminum salt dosing device (15), the sodium hydroxide dosing device (3) is connected with the reaction tank (4), and the aluminum salt dosing device (15) is connected with the reaction tank (4).
4. The device for treating desulfurization waste water by the composite method according to claim 1, wherein a filter is provided in the filtering device (7).
5. The device for treating desulfurization waste water by using the composite method as claimed in claim 4, wherein the filter is a quartz sand filter.
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| CN110746000A (en) * | 2019-11-20 | 2020-02-04 | 华电水务工程有限公司 | Method and device for treating desulfurization wastewater by using composite method |
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| CN110746000A (en) * | 2019-11-20 | 2020-02-04 | 华电水务工程有限公司 | Method and device for treating desulfurization wastewater by using composite method |
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Inventor after: Yan Caixia Inventor after: Qin Shupeng Inventor after: Li Hongxiu Inventor before: Yan Caixia Inventor before: Qin Shupeng Inventor before: Li Hongxiu |