CN112062366A - Coal-fired power plant desulfurization wastewater comprehensive treatment system and method - Google Patents
Coal-fired power plant desulfurization wastewater comprehensive treatment system and method Download PDFInfo
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- C02F7/00—Aeration of stretches of water
Abstract
The invention discloses a coal-fired power plant desulfurization wastewater comprehensive treatment system and a method, which comprises an incoming water pipeline, an aeration oxidation tank, an extraction dechlorination treatment device, a reaction and precipitation integrated device, an electronic flocculator, a rapid centrifugal concentrator, a multi-medium filter, a defluorination filter, a clear water tank, a sodium hypochlorite adding device, an aeration fan, an organic extractant adding device, a back extraction regeneration treatment device, a lime milk adding device, a hydrochloric acid adding device and an organic sulfur adding device.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment of coal-fired power plants, and relates to a comprehensive treatment system and method for desulfurization wastewater of a coal-fired power plant.
Background
With the stricter national environmental protection policy and standard, the pollution discharge permit gradually requires the coal-fired power plant to realize the trend of no discharge of the wastewater of the whole plant, and the recycling of the desulfurization wastewater or the entering of the tail end treatment are the key points for realizing the no discharge of the wastewater of the whole plant. And the tail end wastewater zero-discharge treatment process popularized by the existing power plant is a standard discharge treatment system and a tail end treatment system.
The quality of water of coal fired power plant's desulfurization waste water is very complicated to the fluctuation is great, has the characteristic of "high rigidity, high salinity, high turbidity, strong corrosivity", and traditional discharge to reach standard processing system adopts header and sedimentation tank formula processing technology, and this technology is ripe, easy operation, working costs are low, but in the actual operation of power plant, also appear more problem because of various reasons. The triple box process is a simple chemical precipitation method, the operation and maintenance procedures are complex, the quality of the effluent is unstable, according to the investigation condition, fluoride ions, ammonia nitrogen, COD (chemical oxygen demand) and suspended matters in the effluent of the triple box process of the desulfurization wastewater of a part of coal-fired power plants can not stably reach the standard, and chloride ions almost have no treatment effect and can not be recycled in the plants. The triple box process has no pre-settling link, a large amount of suspended matters have great influence on subsequent process equipment, the sludge is easy to block, the sludge production amount is high, the investment and operation cost of a sludge treatment system are high, and the occupied area is large.
The tail end treatment system adopts the technology of pre-concentration and evaporative crystallization or flue gas evaporation, so that the whole plant wastewater is not discharged, but the technology has high investment and operation cost, large occupied area and difficult operation and maintenance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a comprehensive treatment system and method for desulfurization wastewater of a coal-fired power plant.
In order to achieve the aim, the desulfurization wastewater comprehensive treatment system for the coal-fired power plant comprises an incoming water pipeline, an aeration oxidation tank, an extraction and dechlorination treatment device, a reaction and precipitation integrated device, an electronic flocculator, a rapid centrifugal concentrator, a multi-medium filter, a defluorination filter, a clear water tank, a sodium hypochlorite adding device, an aeration fan, an organic extractant adding device, a lime milk adding device, a hydrochloric acid adding device and an organic sulfur adding device;
the outlet of the water inlet pipeline is communicated with the inlet of the aeration oxidation box, the outlet of the aeration oxidation box is communicated with the inlet of the extraction dechlorination treatment device, the water phase outlet of the extraction dechlorination treatment device is communicated with the inlet of the reaction and precipitation integrated device, the supernatant outlet of the reaction and precipitation integrated device is communicated with the inlet of the electronic flocculator, the outlet of the electronic flocculator is communicated with the inlet of the rapid centrifugal concentrator, and the supernatant outlet of the rapid centrifugal concentrator is communicated with the inlet of the clean water box through the multi-media filter and the defluorination filter;
the outlet of the sodium hypochlorite adding device is communicated with the inlet of the clear water tank, the bottom of the aeration oxidation tank is provided with an aeration stirring device, the bottom of the clear water tank is provided with an aeration oxidation device, and the aeration fan is communicated with the inlet of the aeration oxidation device and the inlet of the aeration stirring device;
the outlet of the device added with the organic extractant is communicated with the inlet of the extraction dechlorination treatment device; the outlet of the lime milk adding device, the outlet of the hydrochloric acid adding device and the outlet of the organic sulfur adding device are communicated with the medicine adding port of the reaction and precipitation integrated device.
The device also comprises a back-extraction regeneration treatment device, wherein an organic phase outlet of the extraction dechlorination treatment device is communicated with an inlet of the back-extraction regeneration treatment device through an organic phase pipeline, and a water phase outlet of the extraction dechlorination treatment device is communicated with an inlet of the reaction and precipitation integrated device through a water phase pipeline.
The device comprises a reaction and precipitation integrated device, a sludge dewatering system and a desulfurization absorption tower, wherein the reaction and precipitation integrated device is internally divided into a pre-precipitation area, a neutralization area, a reaction area, an overflowing area and a precipitation area which are sequentially communicated, an inclined plate is arranged on the side surface of the precipitation area, the pre-precipitation area is communicated with an outlet of an extraction and dechlorination treatment device, a supernatant outlet of the precipitation area is communicated with an inlet of an electronic flocculator, an outlet of a lime milk adding device is communicated with a dosing port of the neutralization area, and an outlet of an organic sulfur adding device and an outlet of a hydrochloric acid adding device are communicated with a dosing port of the reaction area;
a first stirrer is arranged in the neutralization area, a second stirrer is arranged in the reaction area, a mud scraper is arranged at the bottom of the precipitation area, a bottom outlet of the precipitation area and a bottom outlet of the rapid centrifugal concentrator are communicated with an inlet of the sludge dewatering system, a filtrate outlet of the sludge dewatering system is communicated with an inlet of the neutralization area, and a bottom outlet of the pre-precipitation area is communicated with the desulfurization absorption tower.
The device also comprises a pipeline mixer, wherein the inlet of the pipeline mixer is communicated with the outlet of the defluorination filter and the outlet of the sodium hypochlorite adding device, and the outlet of the pipeline mixer is communicated with the inlet of the clean water tank.
The comprehensive treatment method of desulfurization wastewater of a coal-fired power plant comprises the following steps:
desulfurization waste water output by a desulfurization system enters an aeration oxidation box through a water inlet pipeline, water in the aeration oxidation box is uniformly mixed through an aeration stirring device, partial organic matters are removed, and COD (chemical oxygen demand) and ammonia nitrogen concentration in the waste water are reduced; the desulfurization wastewater output by the aeration oxidation box enters an extraction dechlorination treatment device, an organic extractant is added into the extraction dechlorination treatment device through an organic extractant adding device, chloride ions in the desulfurization wastewater are extracted in a complex extraction mode by virtue of the original acidic condition of the desulfurization wastewater, after the desulfurization wastewater is kept for a period of time, organic phases and water phases in reaction products are separated, the separated organic phases are output to a back extraction regeneration treatment device for regeneration, the regenerated products can be recycled as the organic extractant, and the separated water phases are output to a pre-settling zone;
removing suspended matters and partial organic matters in the desulfurization waste water through a pre-settling zone, sequentially feeding supernatant outputted by the pre-settling zone into a neutralization zone and a reaction zone for treatment, adding lime milk solution into the neutralization zone through a lime milk adding device, adjusting the pH value of liquid in the neutralization zone to 10.5-11, converting sulfate into calcium sulfate precipitate to remove inorganic salt, simultaneously forming hydroxide precipitate for partial heavy metals in the waste water, adding hydrochloric acid and organic sulfur into the reaction zone through a hydrochloric acid adding device and an organic sulfur adding device, adjusting the pH value to 9-10 through hydrochloric acid to provide optimal reaction conditions for the organic sulfur, enabling mercury and lead in the desulfurization waste water to form insoluble sulfides, feeding the desulfurization waste water outputted by the reaction zone into the precipitation zone through an overflow zone, then separating and clarifying under the action of an inclined plate, and scraping the precipitate to the bottom of the precipitation zone through a mud scraper, then conveying the sludge to a sludge dewatering system for dewatering treatment, and feeding supernatant liquid output from a settling zone into an electronic flocculator;
in the electronic flocculator, current is introduced into the wastewater to break the stable state of suspended matters in the wastewater, so that the suspended matters in the wastewater are coagulated into floccules, then the floccules enter the rapid centrifugal concentrator to precipitate the floccules, the floccules are prevented from being charged again, and supernatant outputted by the rapid centrifugal concentrator enters the multi-media filter;
and sequentially filtering the wastewater by a multi-media filter and a defluorination filter, adding sodium hypochlorite into the water by a sodium hypochlorite adding device to remove organic matters and ammonia nitrogen in the desulfurization wastewater, finally entering a clear water tank, adding hydrochloric acid into the clear water tank by a hydrochloric acid adding device, and adjusting the pH value of the wastewater to 6-9.
The invention has the following beneficial effects:
the comprehensive treatment system and the comprehensive treatment method for the desulfurization wastewater of the coal-fired power plant have the advantages that during specific operation, the desulfurization wastewater is comprehensively purified through a comprehensive treatment process combining chemical reaction, physical precipitation, electric flocculation, filtration, extraction and aeration oxidation, the in-plant recycling of the desulfurization wastewater is realized, a tail end treatment system is not required to be built, the environmental protection benefit is obvious, the investment and the operation cost are greatly reduced, meanwhile, the occupied area is saved, and the operation and maintenance difficulty is low.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Wherein, 1 is an incoming water pipeline, 2 is an aeration oxidation tank, 3 is an aeration stirring device, 4 is an extraction dechlorination treatment device, 4-1 is a water phase pipeline, 4-2 is an organic phase pipeline, 5 is a back extraction regeneration treatment device, 6 is a reaction and precipitation integrated device, 7 is a pre-settling zone, 8 is a desulfurization absorption tower, 9 is a neutralization zone, 10 is a first stirrer, 11 is a reaction zone, 12 is a second stirrer, 13 is an overflow zone, 14 is a settling zone, 15 is a swash plate zone, 16 is a mud scraper, 17 is an electronic flocculator, 18 is a rapid centrifugal concentrator, 19 is a multi-medium filter, 20 is a defluorination filter, 21 is a pipeline mixer, 22 is a clear water tank, 23 is an aeration oxidation device, 24 is an aeration fan, 25 is a sludge dewatering system, 26 is an organic extraction agent adding device, 27 is a lime milk adding device, 28 is a hydrochloric acid adding device, 29 is an organic sulfur adding device, 29 is a chlorine adding device, and a chlorine adding device, 30 is a sodium hypochlorite adding device.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the desulfurization wastewater comprehensive treatment system for a coal-fired power plant according to the present invention comprises an incoming water pipe 1, an aeration oxidation tank 2, an extraction and dechlorination treatment device 4, a reaction and precipitation integrated device 6, an electronic flocculator 17, a rapid centrifugal concentrator 18, a multi-media filter 19, a fluorine removal filter 20, a clear water tank 22, a sodium hypochlorite adding device 30, an aeration fan 24, an organic extractant adding device 26, a lime milk adding device 27, a hydrochloric acid adding device 28, and an organic sulfur adding device 29; an outlet of the water inlet pipeline 1 is communicated with an inlet of the aeration oxidation box 2, an outlet of the aeration oxidation box 2 is communicated with an inlet of the extraction dechlorination treatment device 4, a water phase outlet of the extraction dechlorination treatment device 4 is communicated with an inlet of the reaction and precipitation integrated device 6, a supernatant outlet of the reaction and precipitation integrated device 6 is communicated with an inlet of the electronic flocculator 17, an outlet of the electronic flocculator 17 is communicated with an inlet of the rapid centrifugal concentrator 18, and a supernatant outlet of the rapid centrifugal concentrator 18 is communicated with an inlet of the clean water tank 22 through the multimedia filter 19 and the fluorine removal filter 20; the outlet of the sodium hypochlorite adding device 30 is communicated with the inlet of the clear water tank 22, the bottom of the aeration oxidation tank 2 is provided with an aeration stirring device 3, the bottom of the clear water tank 22 is provided with an aeration oxidation device 23, and the aeration fan 24 is communicated with the inlet of the aeration oxidation device 23 and the inlet of the aeration stirring device 3; the outlet of the device 26 added with the organic extractant is communicated with the inlet of the extraction dechlorination treatment device 4; the outlet of the lime milk adding device 27, the outlet of the hydrochloric acid adding device 28 and the outlet of the organic sulfur adding device 29 are communicated with the medicine adding port of the reaction and precipitation integrated device 6.
The invention also comprises a back extraction regeneration treatment device 5, wherein an organic phase outlet of the extraction dechlorination treatment device 4 is communicated with an inlet of the back extraction regeneration treatment device 5 through an organic phase pipeline 4-2, and a water phase outlet of the extraction dechlorination treatment device 4 is communicated with an inlet of the reaction and precipitation integrated device 6 through a water phase pipeline 4-1.
The invention also comprises a sludge dewatering system 25 and a desulfurization absorption tower 8, the interior of the reaction-precipitation integrated device 6 is divided into a pre-precipitation zone 7, a neutralization zone 9, a reaction zone 11, an over-flow zone 13 and a precipitation zone 14 which are communicated in sequence, an inclined plate 15 is arranged on the side surface of the precipitation zone 14, wherein the pre-precipitation zone 7 is communicated with the outlet of the extraction dechlorination treatment device 4, the supernatant outlet of the precipitation zone 14 is communicated with the inlet of the electronic flocculator 17, the outlet of the lime milk adding device 27 is communicated with the medicine adding port of the neutralization zone 9, and the outlet of the organic sulfur adding device 29 and the outlet of the hydrochloric acid adding device 28 are communicated with the medicine adding port of the reaction zone 11; a first stirrer 10 is arranged in the neutralization zone 9, a second stirrer 12 is arranged in the reaction zone 11, a mud scraper 16 is arranged at the bottom of the settling zone 14, the bottom outlet of the settling zone 14 and the bottom outlet of the rapid centrifugal concentrator 18 are communicated with the inlet of a sludge dewatering system 25, the filtrate outlet of the sludge dewatering system 25 is communicated with the inlet of the neutralization zone 9, and the bottom outlet of the pre-settling zone 7 is communicated with the desulfurization absorption tower 8.
The invention also comprises a pipeline mixer 21, wherein the inlet of the pipeline mixer 21 is communicated with the outlet of the defluorination filter 20 and the outlet of the sodium hypochlorite adding device 30, and the outlet of the pipeline mixer 21 is communicated with the inlet of the clean water tank 22.
The comprehensive treatment method of desulfurization wastewater of a coal-fired power plant comprises the following steps:
desulfurization waste water output by a desulfurization system enters an aeration oxidation box 2 through a water inlet pipeline 1, water in the aeration oxidation box 2 is uniformly mixed through an aeration stirring device 3, partial organic matters are removed, and COD (chemical oxygen demand) and ammonia nitrogen concentration in the waste water are reduced; the desulfurization wastewater output by the aeration oxidation box 2 enters an extraction dechlorination treatment device 4, an organic extractant is added into the extraction dechlorination treatment device 4 through an organic extractant adding device 26, chloride ions in the desulfurization wastewater are extracted in a complex extraction mode by virtue of the original acidic condition of the desulfurization wastewater, after a period of time, the organic phase and the water phase in a reaction product are separated, the organic phase is output to a back extraction regeneration treatment device 5 through an organic phase pipeline 4-2 for regeneration, the regenerated product can be recycled as the organic extractant, and the water phase is output to a pre-settling zone 7 through a water phase pipeline 4-1;
most suspended matters and partial organic matters in the desulfurization wastewater are removed through the pre-settling zone 7, sludge discharged from the bottom of the pre-settling zone 7 is output to the desulfurization absorption tower 8 and is combined with gypsum slurry in the desulfurization absorption tower 8 for treatment, so that the operation load of a sludge dewatering system 25 and the risk of fouling and blocking of a subsequent desulfurization wastewater treatment system are reduced, the yield of gypsum is increased, supernatant liquid output from the pre-settling zone 7 sequentially enters the neutralization zone 9 and the reaction zone 11 for treatment, lime milk solution is added into the neutralization zone 9 through a lime milk adding device 27, the pH value of liquid in the neutralization zone 9 is adjusted to 10.5-11, sulfate is converted into calcium sulfate precipitate, inorganic salt is removed, and meanwhile, hydroxide precipitate is formed by some heavy metals such as copper, iron and the like in the wastewater. Hydrochloric acid and organic sulfur are added into a reaction zone 11 through a hydrochloric acid adding device 28 and an organic sulfur adding device 29, the pH value is adjusted to 9-10 through the hydrochloric acid, an optimal reaction condition is provided for the organic sulfur, mercury and lead in the desulfurization wastewater form insoluble sulfides, the desulfurization wastewater output from the reaction zone 11 enters a precipitation zone 14 through an overflow zone 13, then separation and clarification are performed under the action of an inclined plate 15, precipitates are scraped to the bottom of the precipitation zone 14 through a mud scraper 16, then the precipitates are conveyed to a sludge dewatering system 25 for dewatering treatment, and supernate output from the precipitation zone 14 enters an electronic flocculator 17;
in the electronic flocculator 17, current is introduced into the wastewater to break the stable state of suspended matters in the wastewater, so that the suspended matters in the wastewater are coagulated into floccules, then the floccules enter the rapid centrifugal concentrator 18 to rapidly precipitate the floccules to prevent the floccules from being recharged, sludge generated at the bottom of the rapid centrifugal concentrator 18 enters a sludge dewatering system 25 to be dewatered, and supernatant outputted by the rapid centrifugal concentrator 18 enters the multi-media filter 19;
the wastewater is sequentially filtered by the multi-media filter 19 and the defluorination filter 20, the multi-media filter 19 adopts a plurality of filter materials to be reasonably matched, so that suspended matters can be optimally removed, and fluorine and fluoride in the defluorination filter 20 are adsorbed on an adsorbent (active Al)2O3) And (3) generating insoluble fluoride on the surface, feeding the filtered water into a clear water tank 22, adding sodium hypochlorite into the water through a sodium hypochlorite adding device 30 to remove organic matters and ammonia nitrogen in the desulfurization wastewater, adding hydrochloric acid into the clear water tank 22 through a hydrochloric acid adding device 28, and adjusting the pH value of the wastewater to 6-9.
According to the invention, organic matters and ammonia nitrogen in the wastewater are effectively removed in a mode of combining aeration oxidation and sodium hypochlorite oxidation, so that the stability of water quality is ensured. The extraction dechlorination treatment device 4 is used for removing chloride ions in the wastewater, so that the content of the chloride ions meets the recycling standard in a factory, the problem that the chloride ions cannot be recycled due to corrosion of the chloride ions on equipment is solved, the back extraction regeneration treatment device 5 is used for realizing the recycling of the organic extractant, resources are saved, and no new pollutants are generated.
The pre-settling zone 7, the neutralization zone 9, the reaction zone 11, the over-flow zone 13 and the settling zone 14 are designed into integrated equipment, the equipment integration degree is high, the occupied area is small, most suspended matters are removed through the pre-settling zone 7, the sludge amount is reduced, the treatment load of the sludge dewatering system 25 is reduced while the stable operation of subsequent equipment is ensured, and the investment and the operating cost of the sludge dewatering system 25 are reduced. The sludge generated in the pre-settling zone 7 is conveyed to the desulfurization absorption tower 8 to be combined with the gypsum slurry for treatment, so that the gypsum yield can be improved.
The invention adopts the electric flocculation treatment process, does not need to add coagulant or coagulant aid, saves the dosing cost and the operating cost of the system while having simple operation and maintenance, further removes suspended matters and fluorine ions through the multi-medium filter 19 and the fluorine removal filter 20, ensures that the fluorine ions and the suspended matters stably reach the standard, and ensures that the reaction condition of the whole system is always in the optimal state through multiple times of pH value adjustment.
Claims (5)
1. A desulfurization wastewater comprehensive treatment system of a coal-fired power plant is characterized by comprising an incoming water pipeline (1), an aeration oxidation box (2), an extraction dechlorination treatment device (4), a reaction and precipitation integrated device (6), an electronic flocculator (17), a rapid centrifugal concentrator (18), a multi-medium filter (19), a defluorination filter (20), a clear water tank (22), a sodium hypochlorite adding device (30), an aeration fan (24), an organic extractant adding device (26), a lime milk adding device (27), a hydrochloric acid adding device (28) and an organic sulfur adding device (29);
an outlet of the water inlet pipeline (1) is communicated with an inlet of the aeration oxidation box (2), an outlet of the aeration oxidation box (2) is communicated with an inlet of the extraction dechlorination treatment device (4), a water phase outlet of the extraction dechlorination treatment device (4) is communicated with an inlet of the reaction and precipitation integrated device (6), an outlet of the reaction and precipitation integrated device (6) is communicated with an inlet of the electronic flocculator (17), an outlet of the electronic flocculator (17) is communicated with an inlet of the rapid centrifugal concentrator (18), and a supernatant outlet of the rapid centrifugal concentrator (18) is communicated with an inlet of the clear water box (22) through the multimedia filter (19) and the defluorination filter (20);
the outlet of the sodium hypochlorite adding device (30) is communicated with the inlet of the clear water tank (22), the bottom of the aeration oxidation tank (2) is provided with an aeration stirring device (3), the bottom of the clear water tank (22) is provided with an aeration oxidation device (23), and the aeration fan (24) is communicated with the inlet of the aeration oxidation device (23) and the inlet of the aeration stirring device (3);
the outlet of the organic extractant adding device (26) is communicated with the inlet of the extraction dechlorination treatment device (4); the outlet of the lime milk adding device (27), the outlet of the hydrochloric acid adding device (28) and the outlet of the organic sulfur adding device (29) are communicated with the medicine adding port of the reaction and precipitation integrated device (6).
2. The integrated treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, further comprising a back extraction regeneration treatment device (5), wherein the organic phase outlet of the extraction dechlorination treatment device (4) is communicated with the inlet of the back extraction regeneration treatment device (5) through an organic phase pipeline (4-2), and the aqueous phase outlet of the extraction dechlorination treatment device (4) is communicated with the inlet of the reaction and precipitation integrated device (6) through an aqueous phase pipeline (4-1).
3. The integrated treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, characterized by further comprising a sludge dewatering system (25) and a desulfurization absorption tower (8), wherein the reaction and precipitation integrated device (6) is internally divided into a pre-precipitation zone (7), a neutralization zone (9), a reaction zone (11), an over-flow zone (13) and a precipitation zone (14) which are sequentially communicated, an inclined plate (15) is arranged on the side surface of the precipitation zone (14), wherein the pre-precipitation zone (7) is communicated with an outlet of the extraction and chlorine removal treatment device (4), a supernatant outlet of the precipitation zone (14) is communicated with an inlet of the electronic flocculator (17), an outlet of the lime milk adding device (27) is communicated with a dosing port of the neutralization zone (9), an outlet of the organic sulfur adding device (29) and an outlet of the hydrochloric acid adding device (28) are communicated with a dosing port of the reaction zone (11);
a first stirrer (10) is arranged in the neutralization area (9), a second stirrer (12) is arranged in the reaction area (11), a mud scraper (16) is arranged at the bottom of the settling area (14), the bottom outlet of the settling area (14) and the bottom outlet of the rapid centrifugal concentrator (18) are communicated with the inlet of a sludge dewatering system (25), the filtrate outlet of the sludge dewatering system (25) is communicated with the inlet of the neutralization area (9), and the bottom outlet of the pre-settling area (7) is communicated with the desulfurization absorption tower (8).
4. The integrated treatment system for desulfurization wastewater of coal-fired power plant according to claim 1, further comprising a line mixer (21), wherein an inlet of the line mixer (21) is communicated with an outlet of the fluorine removal filter (20) and an outlet of the sodium hypochlorite adding device (30), and an outlet of the line mixer (21) is communicated with an inlet of the clean water tank (22).
5. A coal-fired power plant desulfurization wastewater comprehensive treatment method is characterized by comprising the following steps:
desulfurization waste water output by a desulfurization system enters an aeration oxidation box (2) through a water inlet pipeline (1), water in the aeration oxidation box (2) is uniformly mixed through an aeration stirring device (3), partial organic matters are removed, and COD (chemical oxygen demand) and ammonia nitrogen concentration in the waste water are reduced; the desulfurization wastewater output by the aeration oxidation box (2) enters an extraction dechlorination treatment device (4), an organic extracting agent is added into the extraction dechlorination treatment device (4) through an organic extracting agent adding device (26), chloride ions in the desulfurization wastewater are extracted in a complex extraction mode by means of the original acidic condition of the desulfurization wastewater, after a period of time is kept, organic phases and water phases in reaction products are separated, the separated organic phases are output to a back extraction regeneration treatment device (5) for regeneration, the regenerated products can be recycled as the organic extracting agent, and the separated water phases are output to a pre-settling zone (7);
suspended matters and partial organic matters in the desulfurization wastewater are removed through a pre-settling zone (7), the supernatant outputted by the pre-settling zone (7) sequentially enters a neutralization zone (9) and a reaction zone (11) for treatment, a lime milk solution is added into the neutralization zone (9) through a lime milk adding device (27), the pH value of the liquid in the neutralization zone (9) is adjusted to 10.5-11, sulfate is converted into calcium sulfate for precipitation, inorganic salt is removed, partial heavy metals in the wastewater form hydroxide precipitates, hydrochloric acid and organic sulfur are added into the reaction zone (11) through a hydrochloric acid adding device (28) and an organic sulfur adding device (29), the pH value is adjusted to 9-10 through the hydrochloric acid, the optimal reaction condition is provided for the organic sulfur, mercury and lead in the desulfurization wastewater form insoluble sulfides, the desulfurization wastewater outputted by the reaction zone (11) enters a precipitation zone (14) through a flow passing zone (13), then the sludge is separated and clarified under the action of an inclined plate (15), the precipitate is scraped to the bottom of a settling area (14) through a mud scraper (16), then the sludge is conveyed to a sludge dewatering system (25) for dewatering treatment, and the supernatant output by the settling area (14) enters an electronic flocculator (17);
in the electronic flocculator (17), current is introduced into the wastewater to break the stable state of suspended matters in the wastewater, so that the suspended matters in the wastewater are coagulated into floccules, then the floccules enter the rapid centrifugal concentrator (18) to precipitate the floccules and prevent the floccules from being recharged, and supernatant liquid output by the rapid centrifugal concentrator (18) enters the multi-media filter (19);
the wastewater is sequentially filtered through a multi-media filter (19) and a fluorine removal filter (20), then sodium hypochlorite is added into the water through a sodium hypochlorite adding device (30) to further remove organic matters and ammonia nitrogen in the desulfurization wastewater, finally the wastewater enters a clear water tank (22), hydrochloric acid is added into the clear water tank (22) through a hydrochloric acid adding device (28), and the pH value of the wastewater is adjusted to 6-9.
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