CN119409388A - A coal-fired power plant wastewater discharge system and method - Google Patents
A coal-fired power plant wastewater discharge system and method Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
本申请公开了一种燃煤电厂废水排放系统及方法，排放系统包括初级物理处理模块、二级化学处理模块、三级生物处理模块、深度过滤处理模块、沼泽过滤模块、能量回收模块，以及循环处理模块；沼泽过滤模块包括移动底座、沼泽过滤塔、沼泽过滤装置、进水管，以及沼泽溢水管；排放方法通过初级物理处理模块过滤大颗粒固体，二级化学处理模块使小颗粒固体凝聚成大颗粒，三级生物处理模块分解有机物，深度过滤处理模块去除溶解性污染物，沼泽过滤模块提供自然净化，使得废水能够直接排放；循环处理模块将废水导入上一处理模块进行重复过滤；本申请实现了脱硫废水处理的高效性和稳定性，减少过滤处理效果的波动，减少对环境的污染和人体的危害。
The present application discloses a wastewater discharge system and method for a coal-fired power plant, wherein the discharge system comprises a primary physical treatment module, a secondary chemical treatment module, a tertiary biological treatment module, a deep filtration treatment module, a swamp filtration module, an energy recovery module, and a circulation treatment module; the swamp filtration module comprises a mobile base, a swamp filtration tower, a swamp filtration device, an inlet pipe, and a swamp overflow pipe; the discharge method filters large solid particles through the primary physical treatment module, a secondary chemical treatment module condenses small solid particles into large particles, a tertiary biological treatment module decomposes organic matter, a deep filtration treatment module removes soluble pollutants, and a swamp filtration module provides natural purification, so that the wastewater can be discharged directly; the circulation treatment module guides the wastewater into the previous treatment module for repeated filtration; the present application achieves high efficiency and stability in the treatment of desulfurization wastewater, reduces fluctuations in the filtration treatment effect, and reduces pollution to the environment and harm to the human body.
Description
Technical Field
The application relates to the technical field of wastewater purification of coal-fired power plants, in particular to a wastewater discharge system and method of a coal-fired power plant.
Background
In the operation process of the coal-fired power plant, a large amount of desulfurization wastewater is generated, the desulfurization wastewater also contains high-concentration inorganic salt, heavy metal ions and organic pollutants, if the desulfurization wastewater is directly discharged without proper treatment, the desulfurization wastewater can cause great harm to human bodies and the environment, and the traditional wastewater treatment method can remove part of pollutants, but the traditional process has the defects of large fluctuation of filtering effect, poor operation stability, unstable treatment effect, incomplete treatment, low resource recovery rate and the like, and the suspended matters, inorganic salt, heavy metal, organic matters and the like are contained after the filtration.
Disclosure of Invention
The application provides a wastewater discharge system and method for a coal-fired power plant, aiming at overcoming the defect that the desulfurization treatment effect of the existing desulfurization wastewater treatment system for the coal-fired power plant is unstable and the desulfurization treatment is not thorough.
The application provides a wastewater discharge system and a method for a coal-fired power plant, which adopts the following technical scheme:
A wastewater discharge system of a coal-fired power plant, which comprises a primary physical treatment module for filtering large-particle solids, a secondary chemical treatment module communicated with the primary physical treatment module and used for coagulating sedimentation of small and medium particles in wastewater, a tertiary biological treatment module communicated with the secondary chemical treatment module and used for decomposing organic matters in wastewater, a depth filtration treatment module communicated with the tertiary biological treatment module, a swamp filtration module communicated with the depth filtration treatment module, an energy recovery module and a circulation treatment module;
The energy recovery module is respectively connected with the primary physical treatment module, the secondary chemical treatment module and the tertiary biological treatment module;
The circulating treatment module is respectively arranged between the primary physical treatment module and the secondary chemical treatment module, between the secondary chemical treatment module and the tertiary biological treatment module, and between the tertiary biological treatment module and the depth filtration treatment module;
the marsh filtering module comprises a movable base, a marsh filtering tower arranged on the movable base, a marsh filtering device inserted in the marsh filtering tower, a water inlet pipe used for communicating the deep filtering processing module with the bottom of the marsh filtering tower and a marsh overflow pipe used for communicating the top of the marsh filtering tower with an external space.
According to the technical scheme, the primary physical treatment module is used for filtering large-particle solids in the desulfurization wastewater, the secondary chemical treatment module is used for promoting small-particle solids in the desulfurization wastewater to be coagulated into large-particle solids and precipitated through chemical agents, the tertiary biological treatment module is used for decomposing organic matters in the wastewater, the deep filtration treatment module is used for further removing soluble pollutants and suspended matters, the swamp filtration module is used for providing natural purification through the movable base and the swamp filtration device in the swamp filtration tower, so that the wastewater can be directly discharged to the natural environment, the circulation treatment modules are respectively arranged between the treatment modules to ensure that the wastewater can meet the filtration requirements of the treatment modules, and when the filtration requirements of the wastewater are not met, the wastewater is led into the previous treatment module through the circulation treatment module for repeated filtration treatment.
Preferably, the marsh filter device comprises a water inlet layer arranged at the bottom of the marsh filter tower and communicated with the water inlet pipe, a marsh filter layer arranged above the water inlet layer, and a plant overflow layer arranged above the marsh filter layer and communicated with the marsh overflow pipe.
By adopting the technical scheme, the water inlet layer is arranged at the bottom of the marsh filtering tower and is connected with the water inlet pipe and is responsible for receiving the wastewater filtered by the depth filtering treatment module, the marsh filtering layer is arranged above the water inlet layer, organic matters are further degraded and pollutants are removed by utilizing marsh environment and microbial activity, the plant overflow layer is arranged above the marsh filtering layer and is communicated with the marsh overflow pipe, the water quality is further improved through the adsorption and filtering action of plant root systems, meanwhile, the marsh overflow pipe ensures that the clean water after treatment can overflow smoothly and be discharged, the configuration of the whole marsh filtering device is beneficial to improving the wastewater treatment efficiency, realizing better purifying effect and promoting the natural ecological restoration of water.
Preferably, the marsh filtering device further comprises a grid support frame arranged between the water inlet layer and the marsh filtering layer and between the marsh filtering layer and the plant overflow layer, and the grid support frame is fixedly connected with the side wall of the marsh filtering tower.
Through adopting above-mentioned technical scheme, the net support frame is arranged in between intake layer and the marsh filter layer, and between marsh filter layer and the plant overflow layer, and the lateral wall fixed connection of net support frame and marsh filter tower, such structural design has not only strengthened whole marsh filter equipment's stability and structural integrity, the net support frame provides the attached surface of support and microorganism for the marsh filter layer moreover, be favorable to the further promotion of biodiversity's increase and quality of water, the while has ensured the healthy growth of plant root system and the effective absorption of nutrient substance in the plant overflow layer, thereby improved whole marsh filter system and handled the efficiency and the effect of waste water.
Preferably, the marsh filter layer comprises a grid filter frame body, a filter assembly, a sealing side plate and a handle, wherein the grid filter frame body is used for being movably inserted between two grid support frames, the filter assembly is inserted in the grid filter frame body, the sealing side plate is arranged on one side of the grid filter frame body and is used for being in sealing connection with the side wall of the marsh filter tower, and the handle is connected with the sealing side plate.
According to the technical scheme, a stable platform is provided between two adjacent grid support frames and used for accommodating the filtering assembly, the filtering assembly is responsible for removing suspended solids and pollutants in wastewater, in order to ensure the sealing performance and the operation convenience inside the marsh filtering tower, one side of the grid filtering frame body is provided with the sealing side plate, the sealing side plate is in detachable sealing connection with the side wall of the marsh filtering tower, and the sealing side plate is simultaneously connected with the handle, so that the installation, maintenance and replacement processes of the whole marsh filtering layer are simpler and safer, the structural stability of the marsh filtering device is enhanced, the filtering efficiency is improved, the operation convenience and the operation sealing performance are optimized, and the performance and the service life of the whole wastewater treatment system are improved.
Preferably, the filter assembly comprises a microbial ecological stone layer, an activated carbon layer, and a magnetic medium layer.
Through adopting the technical scheme, the filter assembly realizes the efficient wastewater purification effect through the multi-layer combination design, wherein the microbial ecological stone layer utilizes the attached microbial community to degrade organic pollutants, the active carbon layer removes peculiar smell and harmful substances through high adsorption performance, and the magnetic medium layer further removes suspended solids and heavy metal ions in water through adsorption, so that the combination not only improves the removal efficiency of various pollutants in wastewater, but also enhances the stability and durability of the system, ensures the sustainability and the high efficiency of the purification process, and can be replaced and combined among different filter assemblies according to different filtering requirements, thereby improving the flexibility and the expandability of the wastewater treatment system and facilitating customized adjustment according to specific components and treatment requirements of different wastewater.
Preferably, the plant overflow layer comprises an aquatic plant root system absorption layer and an overflow layer arranged above the aquatic plant root system absorption layer.
By adopting the technical scheme, the aquatic plant root system absorption layer effectively absorbs and adsorbs nutrient substances and residual pollutants in the wastewater by utilizing the root system of the aquatic plant, the biological purification effect is enhanced, the water overflows smoothly, and the purified water is allowed to overflow and enter a subsequent treatment stage or is recycled, so that the structure not only improves the purification effect of water quality, but also reduces the use of chemical medicines through a natural purification mechanism of the plant, promotes the balance of an ecological system, provides necessary ecological functions and landscape value for a water body, and can judge the water quality by the state of the aquatic plant in the aquatic plant root system absorption layer, thereby being convenient for simply judging the water quality condition after filtration.
Preferably, the primary physical treatment module comprises a coarse grid unit, a micro-screen unit and a sedimentation tank unit which are connected in sequence;
The secondary chemical treatment module comprises a coagulating sedimentation unit connected with the sedimentation tank unit, a flotation unit connected with the coagulating sedimentation unit, and a redox unit connected with the flotation unit;
The three-stage biological treatment module comprises an anaerobic biological treatment unit connected with the redox unit and an aerobic biological treatment unit connected with the anaerobic biological treatment unit;
the deep filtration treatment module comprises a micro-filtration unit connected with the aerobic biological treatment unit, an ultrafiltration unit connected with the micro-filtration unit, a nanofiltration unit connected with the ultrafiltration unit, and a reverse osmosis unit connected with the nanofiltration unit.
According to the technical scheme, the primary physical treatment module removes large-particle solids through the coarse grid unit, the micro-screen unit intercepts fine particles, the sedimentation tank unit settles smaller particles, solid impurities in wastewater are effectively separated, the secondary chemical treatment module further aggregates the fine particles through the coagulating sedimentation unit, the flotation unit removes grease and suspended matters, the oxidation-reduction unit converts or removes specific pollutants to deepen the purification degree of the wastewater, the three-stage biological treatment module utilizes the anaerobic biological treatment unit and the aerobic biological treatment unit to decompose organic matters, the depth filtration treatment module gradually filters and improves water quality through the micro-filtration unit, the ultrafiltration unit, the nanofiltration unit and the reverse osmosis unit, and finally achieves the aim of recycling and discharging the wastewater with high standard.
Preferably, the energy recovery module comprises a biogas recovery unit connected with the anaerobic biological treatment unit and a heat energy recovery unit respectively connected with the anaerobic biological treatment unit and the aerobic biological treatment unit.
By adopting the technical scheme, the energy recovery module effectively captures the biogas generated in the anaerobic biological treatment unit through the biogas recovery unit, the combustible gas can be used for generating electricity or used as fuel, so that the recycling of energy sources is realized, meanwhile, the heat energy recovery unit is connected with the anaerobic biological treatment unit and the aerobic biological treatment unit, and can recover the heat energy generated in the two processes, so that the primary physical treatment module and the secondary chemical treatment module can be provided with partial heat required by the primary physical treatment module and the secondary chemical treatment module, the consumption of external energy sources is reduced, and the energy recovery mechanism not only improves the energy efficiency of the whole wastewater treatment system, reduces the operation cost, but also reduces the emission of greenhouse gases, and has important environmental protection and economic benefits.
Preferably, the circulation treatment module comprises a primary circulation unit arranged between the primary physical treatment module and the secondary chemical treatment module and used for refluxing waste water in the primary physical treatment module, a secondary circulation unit arranged between the secondary chemical treatment module and the tertiary biological treatment module and used for refluxing waste water in the secondary chemical treatment module, and a tertiary circulation unit arranged between the tertiary biological treatment module and the depth filtration treatment module and used for refluxing waste water in the tertiary biological treatment module;
the primary circulation unit comprises a solid content sensor arranged at the outlet end of the primary physical treatment module, a secondary water inlet valve arranged between the solid content sensor and the secondary chemical treatment module, and a primary reflux valve arranged between the solid content sensor and the inlet end of the primary physical treatment module, wherein the primary reflux valve is connected with the inlet end of the primary physical treatment module, and the solid content sensor is respectively electrically connected with the primary reflux valve and the secondary water inlet valve;
the secondary circulation unit comprises a particle detection sensor arranged at the outlet end of the secondary chemical treatment module, a tertiary water inlet valve arranged between the particle detection sensor and the tertiary biological treatment module, and a secondary reflux valve arranged between the particle detection sensor and the inlet end of the secondary chemical treatment module, wherein the secondary reflux valve is connected with the inlet end of the secondary chemical treatment module, and the particle detection sensor is respectively and electrically connected with the secondary reflux valve and the tertiary water inlet valve;
The three-stage circulation unit comprises an organic matter sensor arranged at the outlet end of the three-stage biological treatment module, a depth filtration water inlet valve arranged between the organic matter sensor and the depth filtration treatment module, and a three-stage backflow valve arranged between the organic matter sensor and the inlet end of the three-stage biological treatment module, wherein the three-stage backflow valve is connected with the inlet end of the three-stage biological treatment module, and the organic matter sensor is respectively electrically connected with the three-stage backflow valve and the depth filtration water inlet valve.
According to the technical scheme, the primary circulating unit monitors the solid content of wastewater by using the solid content sensor, the primary reflux valve and the secondary water inlet valve control water flow, so that the wastewater with the unqualified solid content is returned to the primary physical treatment module for circulating filtration, the filtration effect of the primary physical treatment module is optimized, the secondary circulating unit monitors the particle content of the wastewater by using the particle detection sensor, the water flow is regulated by the secondary reflux valve and the tertiary water inlet valve, the wastewater with the unqualified particle content is returned to the secondary chemical treatment module for circulating filtration, the treatment effect of the secondary chemical treatment module is improved, the tertiary circulating unit detects the content of organic matters in the wastewater by using the organic matter sensor and is matched with the tertiary reflux valve and the depth filtration water inlet valve, the wastewater with the unqualified organic matters is returned to the tertiary biological treatment module for circulating filtration, the efficiency of the tertiary biological treatment module is enhanced, and the design of the whole circulating treatment module improves the flexibility and the adaptability of wastewater treatment by using the precise sensor monitoring and the valve control, and the stability of water quality and the high efficiency of the treatment process are ensured.
The coal-fired power plant wastewater discharge method comprises the following steps:
s1, intercepting large-particle solids in wastewater through the primary physical treatment module;
S2, detecting the content n Fixing device of the solid large particles discharged by the primary physical processing module through the circulating processing module, and presetting the content of the solid large particles to be n Pre-preparation ;
When n Fixing device ＞n Pre-preparation is reached, the circulating treatment module leads the wastewater discharged by the primary physical treatment module back into the primary physical treatment module;
When n Fixing device ≤n Pre-preparation is detected, the primary physical treatment module leads the wastewater into the secondary chemical treatment module through the circulating treatment module;
s3, adding a coagulant into the wastewater through the secondary chemical treatment module to agglomerate tiny particles in the wastewater into large particles and precipitate the large particles;
S4, detecting the content p Fixing device of the solid small particles discharged by the secondary chemical treatment module through the circulation treatment module, wherein the content p Pre-preparation of the preset solid small particles;
when p Fixing device ＞p Pre-preparation is carried out, the circulating treatment module leads the wastewater discharged by the secondary chemical treatment module back into the secondary chemical treatment module;
when p Fixing device ≤p Pre-preparation is carried out, the secondary chemical treatment module leads the wastewater into the tertiary biological treatment module through the circulating treatment module;
s5, decomposing organic matters in the wastewater by the three-stage biological treatment module through microorganisms;
S6, recovering heat and methane generated when microorganisms in the three-stage biological treatment module decompose organic matters through the energy recovery module, and introducing the heat into the secondary chemical treatment module and the primary physical treatment module;
S7, detecting the concentration m Has the following components of the organic matters in the wastewater discharged by the three-stage biological treatment module through the circulating treatment module, wherein the concentration range of the preset organic matters is m Pre-preparation ;
When m Has the following components ＞m Pre-preparation is detected, the circulating treatment module leads the wastewater discharged by the tertiary biological treatment module back into the tertiary biological treatment module;
When m Has the following components ≤m Pre-preparation is carried out, the three-stage biological treatment module leads the wastewater into the depth filtration treatment module through the circulation treatment module;
s8, filtering soluble pollutants and suspended matters in the wastewater through the depth filtration treatment module;
And S9, performing denitrification and dephosphorization on the wastewater through the marsh filtering module, removing heavy metals, and discharging the heavy metals to the outside.
According to the technical scheme, the primary physical treatment module intercepts large-particle solids, the circulating treatment module guides the wastewater back to the primary physical treatment module or pushes the wastewater to the secondary chemical treatment module according to the detection result of the solid content, the secondary chemical treatment module enables tiny particles to be coagulated and precipitated through the coagulant, the circulating treatment module determines the flow direction of the wastewater according to the detection of the small particle content to ensure the treatment efficiency, the three-stage biological treatment module utilizes microorganisms to decompose organic matters, the energy recovery module recovers heat and methane to optimize energy use, the circulating treatment module determines whether the wastewater of the three-stage biological treatment module is circulated or pushed to the depth filtration treatment module according to the concentration of the organic matters, the depth filtration treatment module further removes soluble pollutants and suspended matters, the marsh filtration module completes denitrification and dephosphorization and heavy metal removal to ensure the safe discharge of the wastewater, the wastewater treatment efficiency and the environmental protection are improved, and the energy consumption is reduced through energy recovery.
In summary, the present application includes at least one of the following beneficial technical effects:
1. A waste water discharge system of coal-fired power plant, the primary physical treatment module filters the large granule solid in the desulfurization waste water, the secondary chemical treatment module promotes the small granule solid in the desulfurization waste water to agglomerate into large granule and precipitate through chemical agent, decompose the organic matter in the waste water through the tertiary biological treatment module, further remove soluble pollutant and suspended solid through the deep filtration treatment module, the swamp filtration module provides the natural purification through the swamp filter device in the mobile base and swamp filter tower, make the waste water discharge to the natural environment directly; the application realizes the high efficiency and stability of desulfurization waste water treatment, reduces the fluctuation of the subsequent filtration treatment effect of the desulfurization waste water, can efficiently filter suspended matters, inorganic salts, heavy metals and organic matters in the desulfurization waste water, and reduces the pollution to the environment and the harm to human bodies;
2. In order to ensure the tightness inside the marsh filtering tower and the convenience of operation, one side of the grid filtering frame body is provided with a sealing side plate which is in detachable sealing connection with the side wall of the marsh filtering tower, and the sealing side plate is simultaneously connected with a handle, so that the installation, maintenance and replacement processes of the whole marsh filtering layer are simpler and safer;
3. A method for discharging waste water from coal-fired power plant includes such steps as intercepting large-particle solid by primary physical treating module, circulating treating module to return the waste water to primary physical treating module or push it to secondary chemical treating module, coagulating and depositing small particles by coagulant, determining the flow direction of waste water by circulating treating module, decomposing organic matter by microbe, recovering heat and marsh gas, optimizing energy consumption, determining if the waste water is circulated or pushed to deep filtering treating module, removing soluble pollutant and suspended matter by deep filtering treating module, removing nitrogen, phosphorus and heavy metals by marsh filtering module, and saving energy.
Drawings
FIG. 1 is a schematic diagram of a connection block of an embodiment of the wastewater discharge system of a coal-fired power plant of the present application.
FIG. 2 is a schematic diagram of a connection block of a circulation treatment module of an embodiment of a wastewater discharge system of a coal-fired power plant according to the present application.
FIG. 3 is a schematic cross-sectional view of a marsh filtration module of an embodiment of the wastewater discharge system of a coal-fired power plant of the present application.
FIG. 4 is a schematic diagram of a cross-sectional plug-in connection structure of a marsh filter layer and a marsh filter tower of an embodiment of the wastewater discharge system of a coal-fired power plant.
FIG. 5 is a schematic flow chart of the steps of an embodiment of the wastewater discharge method of the coal-fired power plant of the present application.
Reference numerals illustrate:
1. Primary physical treatment module, 11, coarse grid unit, 12, micro screen unit, 13, sedimentation tank unit, 2, secondary chemical treatment module, 21, coagulating sedimentation unit, 22, floatation unit, 23, oxidation reduction unit, 3, tertiary biological treatment module, 31, anaerobic biological treatment unit, 32, aerobic biological treatment unit, 4, deep filtration treatment module, 41, micro filtration unit, 42, ultrafiltration unit, 43, nanofiltration unit, 44, reverse osmosis unit;
5. A marsh filtration module; 51, a movable base, 52, a marsh filtering tower, 53, a marsh filtering device, 54, a water inlet pipe, 55, a marsh overflow pipe, 56, a grid support frame, 531, a water inlet layer, 532, a marsh filtering layer, 533, a plant overflow layer, 551, a water pump, 5321, a grid filtering frame body, 5322, a filtering component, 5323, a sealing side plate, 5324, a handle, 5325, a microbial ecological stone layer, 5326, an active carbon layer, 5327, a magnetic medium layer, 5331, an aquatic plant root system absorption layer, 5332 and an overflow layer;
6. The device comprises an energy recovery module, 61, a biogas recovery unit, 62, a heat energy recovery unit, 7, a circulation processing module, 71, a primary circulation unit, 72, a secondary circulation unit, 73, a tertiary circulation unit, 711, a solid content sensor, 712, a secondary water inlet valve, 713, a primary reflux valve, 721, a particle detection sensor, 722, a tertiary water inlet valve, 723, a secondary reflux valve, 731, an organic matter sensor, 732, a depth filtration water inlet valve, 733 and a tertiary reflux valve.
Detailed Description
The application is described in further detail below with reference to fig. 1-5.
The embodiment of the application discloses a wastewater discharge system and a method for a coal-fired power plant. Referring to fig. 1 to 3, a wastewater discharge system of a coal-fired power plant includes a primary physical treatment module 1 for filtering large-particle solids, a secondary chemical treatment module 2 which communicates with the primary physical treatment module 1 and is used for coagulation and precipitation of small-sized particles in wastewater, a tertiary biological treatment module 3 which communicates with the secondary chemical treatment module 2 and is used for decomposing organic matters in wastewater, a depth filtration treatment module 4 which communicates with the tertiary biological treatment module 3, a swamp filtration module 5 which communicates with the depth filtration treatment module 4, an energy recovery module 6, and a circulation treatment module 7;
The energy recovery module 6 is respectively connected with the primary physical treatment module 1, the secondary chemical treatment module 2 and the tertiary biological treatment module 3;
the circulating treatment module 7 is respectively arranged between the primary physical treatment module 1 and the secondary chemical treatment module 2, between the secondary chemical treatment module 2 and the tertiary biological treatment module 3 and between the tertiary biological treatment module 3 and the depth filtration treatment module 4;
The marsh filtration module 5 comprises a mobile base 51, a marsh filtration tower 52 arranged on the mobile base 51, a marsh filtration device 53 inserted in the marsh filtration tower 52, a water inlet pipe 54 used for communicating the depth filtration treatment module 4 and the bottom of the marsh filtration tower 52, and a marsh overflow pipe 55 used for communicating the top of the marsh filtration tower 52 and the external space.
The application filters large-particle solids in desulfurization wastewater through the primary physical treatment module 1, the secondary chemical treatment module 2 promotes the aggregation of small-particle solids in the desulfurization wastewater into large particles and precipitation through chemical agents, organic matters in the wastewater are decomposed through the tertiary biological treatment module 3, soluble pollutants and suspended matters are further removed through the depth filtration treatment module 4, and the swamp filtration module 5 provides natural purification through the mobile base 51 and the swamp filtration device 53 in the swamp filtration tower 52, so that the wastewater can be directly discharged to the natural environment; the application realizes the high efficiency and stability of desulfurization waste water treatment, reduces the fluctuation of the subsequent filtering treatment effect of the desulfurization waste water, can efficiently filter suspended matters, inorganic salts, heavy metals and organic matters in the desulfurization waste water, and reduces the pollution to the environment and the harm to human bodies;
The traditional wastewater treatment system is lack of flexibility and expandability and is difficult to customize and adjust according to specific components and treatment requirements of different wastewater, and the combination and position adjustment of the primary physical treatment module 1, the secondary chemical treatment module 2, the tertiary biological treatment module 3 and the depth filtration treatment module 4 as well as the swamp filtration module 5 can customize and adjust according to specific components and treatment requirements of different wastewater, and the swamp filtration tower 52 can be driven to move in position by the movable base 51, so that a plurality of swamp filtration modules 5 can be combined in series or parallel by connecting the water inlet pipes 54 and the swamp overflow pipes 55 on different swamp filtration modules 5, thereby not only improving the wastewater filtration efficiency, but also improving the flexibility and expandability of wastewater filtration and discharge.
The water pump 551 is also arranged on the swamp overflow pipe 55, and when a plurality of swamp filtering modules 5 are connected with each other, the water pump 551 is used for guiding and flowing the filtered wastewater, thereby improving the filtering efficiency.
Further, as shown in fig. 1 and 3, the marsh filtering device 53 includes a water inlet layer 531 provided at the bottom of the marsh filtering tower 52 and communicated with the water inlet pipe 54, a marsh filtering layer 532 provided above the water inlet layer 531, and a plant overflow layer 533 provided above the marsh filtering layer 532 and communicated with the marsh overflow pipe 55.
The water inlet layer 531 is arranged at the bottom of the marsh filtering tower 52 and is connected with the water inlet pipe 54 and is responsible for receiving the wastewater filtered by the depth filtering treatment module 4, the marsh filtering layer 532 is arranged above the water inlet layer 531 and further degrades organic matters and removes pollutants by utilizing marsh environment and microbial activity, the plant overflow layer 533 is arranged above the marsh filtering layer 532 and is communicated with the marsh overflow pipe 55, the water quality is further improved by the adsorption and filtering action of plant root systems, meanwhile, the marsh overflow pipe 55 ensures that the treated clean water can overflow smoothly and be discharged, the configuration of the whole marsh filtering device 53 is beneficial to improving the wastewater treatment efficiency, realizing better purifying effect and promoting the natural ecological restoration of water.
Still further, as shown in fig. 3, the marsh filtering device 53 further includes a mesh support frame 56 disposed between the water inlet layer 531 and the marsh filtering layer 532, and between the marsh filtering layer 532 and the plant overflow layer 533, and the mesh support frame 56 is fixedly connected to the sidewall of the marsh filtering tower 52.
The grid support frame 56 is arranged between the water inlet layer 531 and the marsh filter layer 532 and between the marsh filter layer 532 and the plant overflow layer 533, and the grid support frame 56 is fixedly connected with the side wall of the marsh filter tower 52, so that the structural design not only enhances the stability and structural integrity of the whole marsh filter device 53, but also provides the support and microorganism attachment surface for the marsh filter layer 532, thereby being beneficial to the increase of biological diversity and the further improvement of water quality, and simultaneously ensuring the healthy growth of plant root systems and the effective absorption of nutrient substances in the plant overflow layer 533, thereby improving the efficiency and the effect of the whole marsh filter system for treating wastewater.
Specifically, as shown in fig. 3, the marsh filter layer 532 includes a mesh filter frame 5321 for being movably inserted between two mesh support frames 56, a filter assembly 5322 inserted into the mesh filter frame 5321, a sealing side plate 5323 provided at one side of the mesh filter frame 5321 for sealing connection with a sidewall of the marsh filter tower 52, and a handle 5324 connected with the sealing side plate 5323.
The application provides a marsh filter layer 532, which comprises a grid filter frame 5321, wherein the grid filter frame 5321 is used for being movably inserted between two grid support frames 56, a stable platform is provided for accommodating a filter component 5322, the filter component 5322 is responsible for removing suspended solids and pollutants in wastewater, a sealing side plate 5323 is arranged on one side of the grid filter frame 5321 in order to ensure the sealing property inside a marsh filter tower 52 and the convenience of operation, the sealing side plate 5323 is detachably connected with the side wall of the marsh filter tower 52, and the sealing side plate 5323 is simultaneously connected with a handle 5324, so that the installation, maintenance and replacement process of the whole marsh filter layer 532 is simpler and safer;
The sealing side plate 5323 is in plug-in connection with the side wall of the marsh filtering tower 52 through the clamping groove and the sealing rubber pad, and is fixedly connected through bolts, so that the marsh filtering tower is convenient to assemble, disassemble and replace.
More specifically, as shown in fig. 4, the filter assembly 5322 includes a microbial ecological layer 5325, an activated carbon layer 5326, and a magnetic media layer 5327.
The filter assembly 5322 realizes a high-efficiency wastewater purification effect through a multi-layer combination design, wherein the microbial ecological agent layer 5325 utilizes an attached microbial community to degrade organic pollutants, the active carbon layer 5326 removes peculiar smell and harmful substances through high adsorption performance, the magnetic medium layer 5327 further removes suspended solids and heavy metal ions in water through adsorption, the combination not only improves the removal efficiency of various pollutants in wastewater, but also enhances the stability and durability of the system, ensures the persistence and high efficiency of the purification process, and different filter assemblies 5322 can be replaced and combined according to different filtering requirements, so that the flexibility and expandability of the wastewater treatment system are improved, and customized adjustment is facilitated according to specific components and treatment requirements of different wastewater.
In addition, as shown in fig. 4, the plant overflow layer 533 includes an aquatic plant root system absorbing layer 5331, and an overflow layer 5332 provided above the aquatic plant root system absorbing layer 5331.
The plant overflow layer 533 is composed of an aquatic plant root system absorption layer 5331 and an overflow layer 5332, the aquatic plant root system absorption layer 5331 effectively absorbs and adsorbs nutrient substances and residual pollutants in wastewater by utilizing the root system of the aquatic plant, the biological purification effect is enhanced, the overflow layer 5332 allows purified water to overflow smoothly and enter a subsequent treatment stage or be recycled, the structure not only improves the purification effect of water quality, but also reduces the use of chemical medicines by a natural purification mechanism of the plant, promotes the balance of an ecological system, provides necessary ecological functions and landscape value for a water body, and can judge the water quality by utilizing the state of the aquatic plant in the aquatic plant root system absorption layer 5331, so that the water quality condition after filtration is convenient to judge simply.
Also, as shown in fig. 1, the primary physical treatment module 1 includes a coarse grille unit 11, a micro screen unit 12, and a sedimentation tank unit 13, which are connected in this order;
The secondary chemical treatment module 2 comprises a coagulating sedimentation unit 21 connected with the sedimentation tank unit 13, a flotation unit 22 connected with the coagulating sedimentation unit 21, and a redox unit 23 connected with the flotation unit 22;
the three-stage biological treatment module 3 includes an anaerobic biological treatment unit 31 connected to the redox unit 23, and an aerobic biological treatment unit 32 connected to the anaerobic biological treatment unit 31;
the depth filtration treatment module 4 includes a microfiltration unit 41 connected to the aerobic biological treatment unit 32, an ultrafiltration unit 42 connected to the microfiltration unit 41, a nanofiltration unit 43 connected to the ultrafiltration unit 42, and a reverse osmosis unit 44 connected to the nanofiltration unit 43.
The primary physical treatment module 1 of the application removes large-particle solids through a coarse grid unit 11, a micro-screen unit 12 intercepts fine particles, and a sedimentation tank unit 13 settles smaller particles, so that solid impurities in wastewater are effectively separated, wherein the coarse grid unit 11 consists of a group of parallel metal strips or grid pieces and is arranged in a channel through which the wastewater flows to form a physical barrier, the micro-screen unit 12 is a finer metal wire net and is used for intercepting the finer particles, the sedimentation tank unit 13 is a structure for settling suspended solid particles in the wastewater by utilizing the action of gravity, a sludge collecting area is designed at the bottom of the sedimentation tank unit 13, and sludge can be removed periodically through a sludge scraper or a sludge suction truck;
The secondary chemical treatment module 2 further aggregates the tiny particles through a coagulating sedimentation unit 21, the flotation unit 22 removes grease and suspended matters, the oxidation-reduction unit 23 converts or removes specific pollutants to deepen the purification degree of the wastewater, the coagulating sedimentation unit 21 comprises a coagulating tank, a coagulating agent (such as polyaluminum chloride PAC or polymeric ferric sulfate PFS) and the wastewater are fully mixed to enable the tiny particles to aggregate into large particles so as to be convenient for sedimentation, the flotation unit 22 comprises a flotation tank or a flotation machine, the flotation unit 22 generates tiny bubbles through aeration to enable the flotation agent attached to the pollutants to float up to the water surface to form scum for removing grease, surfactants and other pollutants which are not easy to settle, and the oxidation-reduction unit 23 performs oxidation-reduction reaction by adding an oxidizing agent (such as chlorine, ozone or hydrogen peroxide) or a reducing agent (such as ferrous sulfate) into the wastewater for removing or converting the organic matters which are difficult to degrade, heavy metal ions or other specific pollutants;
The three-stage biological treatment module 3 utilizes an anaerobic biological treatment unit 31 and an aerobic biological treatment unit 32 to decompose organic matters, wherein the anaerobic biological treatment unit 31 is preferably an up-flow anaerobic sludge bed (UASB), the up-flow anaerobic sludge bed consists of a sludge layer at the bottom, a waste water and sludge mixing zone in the middle and a three-phase separator at the top, the waste water enters from the bottom of the up-flow anaerobic sludge bed and flows upwards through the sludge bed, and microorganisms decompose the organic matters under anaerobic conditions, and the generated biogas is collected by the three-phase separator;
The deep filtration treatment module 4 gradually filters and improves water quality through a microfiltration unit 41, an ultrafiltration unit 42, a nanofiltration unit 43 and a reverse osmosis unit 44 to remove soluble pollutants and suspended matters, and finally achieves the aim of recycling and discharging high-standard wastewater, the microfiltration unit 41 preferably filters bacteria, algae and some viruses through a microporous membrane (with the pore diameter of about 0.1-10 microns), the ultrafiltration unit 42 preferably removes smaller particles such as viruses and macromolecular organic matters through a membrane with smaller pore diameter (about 0.01-0.1 micron), the nanofiltration unit 43 preferably uses a semipermeable membrane with the pore diameter of nano level and can remove multivalent ions and some monovalent ions in the water, and the reverse osmosis unit 44 preferably uses a membrane with high desalination rate and can remove most soluble salts and organic matters.
Further, as shown in fig. 1, the energy recovery module 6 includes a biogas recovery unit 61 connected to the anaerobic biological treatment unit 31, and a heat energy recovery unit 62 connected to the anaerobic biological treatment unit 31 and the aerobic biological treatment unit 32, respectively.
The energy recovery module 6 effectively captures the biogas generated in the anaerobic biological treatment unit 31 through the biogas recovery unit 61, and the combustible gas can be used for generating electricity or used as fuel so as to realize the recycling of energy, meanwhile, the heat energy recovery unit 62 is connected with the anaerobic biological treatment unit 31 and the aerobic biological treatment unit 32, can recover the heat energy generated in the two processes, and provides partial heat for the primary physical treatment module 1 and the secondary chemical treatment module 2, thereby reducing the consumption of external energy;
The heat recovery unit 62 is preferably a heat exchanger, a heat pump system or a waste heat boiler, and in the third stage biological treatment module 3, heat generated by decomposition of organic matters can be recovered through the heat exchanger for preheating cooled waste water or heating the primary physical treatment module 1 and the secondary chemical treatment module 2.
Still further, as shown in fig. 1 and 2, the circulation treatment module 7 includes a primary circulation unit 71 provided between the primary physical treatment module 1 and the secondary chemical treatment module 2 for the backflow of wastewater in the primary physical treatment module 1, a secondary circulation unit 72 provided between the secondary chemical treatment module 2 and the tertiary biological treatment module 3 for the backflow of wastewater in the secondary chemical treatment module 2, and a tertiary circulation unit 73 provided between the tertiary biological treatment module 3 and the depth filtration treatment module 4 for the backflow of wastewater in the tertiary biological treatment module 3;
the primary circulation unit 71 includes a solid content sensor 711 provided at an outlet end of the primary physical treatment module 1, a secondary water inlet valve 712 provided between the solid content sensor 711 and the secondary chemical treatment module 2, and a primary return valve 713 provided between the solid content sensor 711 and an inlet end of the primary physical treatment module 1, the primary return valve 713 being connected to the inlet end of the primary physical treatment module 1, the solid content sensor 711 being electrically connected to the primary return valve 713 and the secondary water inlet valve 712, respectively;
the secondary circulation unit 72 includes a particle detection sensor 721 provided at an outlet end of the secondary chemical treatment module 2, a tertiary water inlet valve 722 provided between the particle detection sensor 721 and the tertiary biological treatment module 3, and a secondary return valve 723 provided between the particle detection sensor 721 and an inlet end of the secondary chemical treatment module 2, the secondary return valve 723 being connected to the inlet end of the secondary chemical treatment module 2, the particle detection sensor 721 being electrically connected to the secondary return valve 723 and the tertiary water inlet valve 722, respectively;
The three-stage circulation unit 73 comprises an organic matter sensor 731 arranged at the outlet end of the three-stage biological treatment module 3, a depth filtration water inlet valve 732 arranged between the organic matter sensor 731 and the depth filtration treatment module 4, and a three-stage backflow valve 733 arranged between the organic matter sensor 731 and the inlet end of the three-stage biological treatment module 3, wherein the three-stage backflow valve 733 is connected with the inlet end of the three-stage biological treatment module 3, and the organic matter sensor 731 is electrically connected with the three-stage backflow valve 733 and the depth filtration water inlet valve 732 respectively.
The circulating treatment module 7 realizes the efficient circulating filtration treatment of the wastewater by arranging the primary circulating unit 71, the secondary circulating unit 72 and the tertiary circulating unit 73, wherein the primary circulating unit 71 monitors the solid content of the wastewater by using the solid content sensor 711, and controls the water flow by using the primary reflux valve 713 and the secondary water inlet valve 712 to enable the wastewater with the substandard solid content to return to the primary physical treatment module 1 for circulating filtration, so that the filtration effect of the primary physical treatment module 1 is optimized;
The secondary circulation unit 72 adopts a particle detection sensor 721 to monitor the content of the particles in the wastewater, and the water flow is regulated through a secondary reflux valve 723 and a tertiary water inlet valve 722, so that the wastewater with the substandard content of the particles is returned to the secondary chemical treatment module 2 for circulation filtration, and the treatment effect of the secondary chemical treatment module 2 is improved;
The three-stage circulation unit 73 detects the content of organic matters in the wastewater by using the organic matter sensor 731, and is matched with the three-stage backflow valve 733 and the depth filtration water inlet valve 732, so that the wastewater with the substandard organic matter content is returned to the three-stage biological treatment module 3 for circulation filtration, the efficiency of the three-stage biological treatment module 3 is enhanced, the flexibility and adaptability of wastewater treatment are improved by the design of the whole circulation treatment module 7 through accurate sensor monitoring and valve control, the stability of water quality and the high efficiency of the treatment process are ensured, the consumption of energy and water resources is reduced, and the economical efficiency and the sustainability of the system are enhanced.
Specifically, as shown in fig. 5, the application also discloses a coal-fired power plant wastewater discharge method, which comprises a coal-fired power plant wastewater discharge system, and further comprises the following steps:
S1, intercepting large-particle solids in wastewater through a primary physical treatment module 1;
S2, detecting the content n Fixing device of the solid large particles discharged by the primary physical processing module 1 through the circulating processing module 7, and presetting the content of the solid large particles to be n Pre-preparation ;
when n Fixing device ＞n Pre-preparation is reached, the circulating treatment module 7 guides the wastewater discharged by the primary physical treatment module 1 back into the primary physical treatment module 1;
When n Fixing device ≤n Pre-preparation is reached, the primary physical treatment module 1 leads the wastewater into the secondary chemical treatment module 2 through the circulation treatment module 7;
S3, adding a coagulant into the wastewater through the secondary chemical treatment module 2 to agglomerate tiny particles in the wastewater into large particles and precipitate the large particles;
S4, detecting the content p Fixing device of the solid small particles discharged by the secondary chemical treatment module 2 through the circulation treatment module 7, and presetting the content p Pre-preparation of the solid small particles;
When p Fixing device ＞p Pre-preparation is carried out, the circulating treatment module 7 leads the wastewater discharged by the secondary chemical treatment module 2 back into the secondary chemical treatment module 2;
When p Fixing device ≤p Pre-preparation is carried out, the secondary chemical treatment module 2 leads the wastewater into the tertiary biological treatment module 3 through the circulating treatment module 7;
S5, decomposing organic matters in the wastewater by the three-stage biological treatment module 3 through microorganisms;
S6, recovering heat and methane generated when microorganisms in the three-stage biological treatment module 3 decompose organic matters through the energy recovery module 6, and introducing the heat into the secondary chemical treatment module 2 and the primary physical treatment module 1;
S7, detecting the concentration m Has the following components of the organic matters in the wastewater discharged by the three-stage biological treatment module 3 through the circulating treatment module 7, wherein the concentration range of the preset organic matters is m Pre-preparation ;
When m Has the following components ＞m Pre-preparation is reached, the circulating treatment module 7 leads the wastewater discharged by the tertiary biological treatment module 3 back into the tertiary biological treatment module 3;
When m Has the following components ≤m Pre-preparation is reached, the three-stage biological treatment module 3 leads the wastewater into the depth filtration treatment module 4 through the circulation treatment module 7;
s8, filtering soluble pollutants and suspended matters in the wastewater through a depth filtration treatment module 4;
And S9, performing denitrification and dephosphorization on the wastewater through the marsh filtering module 5, removing heavy metals, and discharging the heavy metals to the outside.
According to the application, in the step S1, a primary physical treatment module 1 intercepts large-particle solids, the step S2 determines whether to guide the wastewater back to the primary physical treatment module 1 or push the wastewater to a secondary chemical treatment module 2 through a circulation treatment module 7 according to the detection result of the solid content, the step S3, the secondary chemical treatment module 2 coagulates and precipitates tiny particles through a coagulant, the step S4 determines the flow direction of the wastewater according to the detection of the small-particle content to ensure the treatment efficiency, the step S5, the step S3 utilizes microorganisms to decompose organic matters, the step S6, an energy recovery module 6 recovers heat and methane to optimize energy use, the step S7 determines whether the wastewater of the step S3 is circulated or pushed to a depth filtration treatment module 4 according to the concentration of the organic matters, the step S8 further removes soluble pollutants and suspended matters through the depth filtration treatment module 4, the step S9 completes denitrification dephosphorization and heavy metal removal through the depth filtration module 5 to ensure the safe discharge of the wastewater, the efficiency and the environmental protection of the wastewater are improved, and the energy recovery and the energy consumption is reduced through the energy recovery in the step S6, and the energy recovery of the wastewater discharge goal of a power plant is realized.
The implementation principle of the wastewater discharge system and the method of the coal-fired power plant provided by the embodiment of the application is as follows:
The application discloses a wastewater discharge system of a coal-fired power plant, which comprises a primary physical treatment module 1, a secondary chemical treatment module 2, a third-stage biological treatment module 3, a swamp filtration module 5, a circulation treatment module 7, a circulating treatment module 7, a water treatment module and a water treatment module, wherein the primary physical treatment module 1 is used for filtering large-particle solids in desulfurization wastewater, the secondary chemical treatment module 2 is used for promoting the aggregation of small-particle solids in the desulfurization wastewater into large-particle solids and precipitating the large-particle solids through chemical agents, the third-stage biological treatment module 3 is used for decomposing organic matters in the wastewater, the deep filtration treatment module 4 is used for further removing soluble pollutants and suspended matters, the swamp filtration module 5 is used for providing natural purification through a movable base 51 and a swamp filtration device 53 in a swamp filtration tower 52, so that the wastewater can be directly discharged to the natural environment;
The marsh filter layer 532 includes a mesh filter frame 5321, the mesh filter frame 5321 being adapted to be movably inserted between two mesh support frames 56, providing a stable platform for receiving a filter element 5322, the filter element 5322 being responsible for removing suspended solids and contaminants from the wastewater; in order to ensure the tightness of the interior of the marsh filtering tower 52 and the convenience of operation, one side of the grid filtering frame body 5321 is provided with a sealing side plate 5323, the sealing side plate 5323 is detachably connected with the side wall of the marsh filtering tower 52, and the sealing side plate 5323 is simultaneously connected with a handle 5324, so that the installation, maintenance and replacement processes of the whole marsh filtering layer 532 are simpler and safer;
A method for discharging waste water from coal-fired power plant includes S1, a primary physical treatment module 1 for intercepting large-particle solids, S2, a circulation treatment module 7 for determining whether waste water is led back to the primary physical treatment module 1 or pushed to a secondary chemical treatment module 2 according to the detection result of the solid content, S3, a secondary chemical treatment module 2 for coagulating and precipitating tiny particles through a coagulant, S4, a waste water flow direction determining according to the detection of the small-particle content for ensuring treatment efficiency, S5, a tertiary biological treatment module 3 for decomposing organic matters by microorganisms, S6, an energy recovery module 6 for recovering heat and methane and optimizing energy use, S7, and S9 for determining whether waste water from the tertiary biological treatment module 3 is circulated or pushed to a depth filtration treatment module 4 according to the concentration of the organic matters, S8 for further removing soluble pollutants and suspended matters through the depth filtration treatment module 4, and S9, wherein the marsh filtration module 5 for removing nitrogen and phosphorus and heavy metals and ensuring safe discharge of the waste water, and the energy recovery efficiency and environmental protection of the waste water treatment are improved, and energy consumption is reduced by energy consumption of the power plant.
The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.
Claims (10)
1. A wastewater discharge system of a coal-fired power plant, which is characterized by comprising a primary physical treatment module (1) for filtering large-particle solids, a secondary chemical treatment module (2) communicated with the primary physical treatment module (1) and used for coagulating and precipitating small particles in wastewater, a tertiary biological treatment module (3) communicated with the secondary chemical treatment module (2) and used for decomposing organic matters in wastewater, a depth filtration treatment module (4) communicated with the tertiary biological treatment module (3), a swamp filtration module (5) communicated with the depth filtration treatment module (4), an energy recovery module (6) and a circulation treatment module (7);
The energy recovery module (6) is respectively connected with the primary physical treatment module (1), the secondary chemical treatment module (2) and the tertiary biological treatment module (3);
The circulating treatment module (7) is respectively arranged between the primary physical treatment module (1) and the secondary chemical treatment module (2), between the secondary chemical treatment module (2) and the tertiary biological treatment module (3) and between the tertiary biological treatment module (3) and the depth filtration treatment module (4);
The marsh filtration module (5) comprises a movable base (51), a marsh filtration tower (52) arranged on the movable base (51), a marsh filtration device (53) inserted in the marsh filtration tower (52), a water inlet pipe (54) used for communicating the depth filtration treatment module (4) with the bottom of the marsh filtration tower (52), and a marsh overflow pipe (55) used for communicating the top of the marsh filtration tower (52) with an external space.
2. The wastewater discharge system of a coal-fired power plant according to claim 1, characterized in that the marsh filtering device (53) comprises a water inlet layer (531) arranged at the bottom of the marsh filtering tower (52) and communicated with the water inlet pipe (54), a marsh filtering layer (532) arranged above the water inlet layer (531), and a plant water overflow layer (533) arranged above the marsh filtering layer (532) and communicated with the marsh overflow pipe (55).
3. The coal-fired power plant wastewater discharge system according to claim 2, wherein the swamp filtering device (53) further comprises a grid support frame (56) arranged between the water inlet layer (531) and the swamp filtering layer (532) and between the swamp filtering layer (532) and the plant water overflowing layer (533), and the grid support frame (56) is fixedly connected with the side wall of the swamp filtering tower (52).
4. A wastewater discharge system of a coal-fired power plant according to claim 3, characterized in that the marsh filter layer (532) comprises a mesh filter frame (5321) for being movably inserted between two mesh support frames (56), a filter assembly (5322) inserted into the mesh filter frame (5321), a sealing side plate (5323) arranged at one side of the mesh filter frame (5321) and used for being in sealing connection with the side wall of the marsh filter tower (52), and a handle (5324) connected with the sealing side plate (5323).
5. The coal-fired power plant wastewater discharge system according to claim 4, wherein the filter assembly (5322) comprises a microbial ecological stone layer (5325), an activated carbon layer (5326), and a magnetic medium layer (5327).
6. The coal-fired power plant wastewater discharge system according to claim 4, wherein the plant overflow layer (533) comprises an aquatic plant root system absorption layer (5331), and an overflow layer (5332) provided above the aquatic plant root system absorption layer (5331).
7. The wastewater discharge system of a coal-fired power plant according to claim 1, characterized in that the primary physical treatment module (1) comprises a coarse grid unit (11), a micro-screen unit (12) and a sedimentation tank unit (13) which are connected in sequence;
The secondary chemical treatment module (2) comprises a coagulating sedimentation unit (21) connected with the sedimentation tank unit (13), a flotation unit (22) connected with the coagulating sedimentation unit (21), and a redox unit (23) connected with the flotation unit (22);
The three-stage biological treatment module (3) comprises an anaerobic biological treatment unit (31) connected with the redox unit (23), and an aerobic biological treatment unit (32) connected with the anaerobic biological treatment unit (31);
The depth filtration treatment module (4) comprises a microfiltration unit (41) connected with the aerobic biological treatment unit (32), an ultrafiltration unit (42) connected with the microfiltration unit (41), a nanofiltration unit (43) connected with the ultrafiltration unit (42), and a reverse osmosis unit (44) connected with the nanofiltration unit (43).
8. The wastewater discharge system of a coal-fired power plant according to claim 7, characterized in that the energy recovery module (6) comprises a biogas recovery unit (61) connected to the anaerobic biological treatment unit (31), and a heat energy recovery unit (62) connected to the anaerobic biological treatment unit (31) and the aerobic biological treatment unit (32), respectively.
9. The wastewater discharge system of a coal-fired power plant according to claim 7, characterized in that the circulation treatment module (7) comprises a primary circulation unit (71) arranged between the primary physical treatment module (1) and the secondary chemical treatment module (2) and used for wastewater reflux in the primary physical treatment module (1), a secondary circulation unit (72) arranged between the secondary chemical treatment module (2) and the tertiary biological treatment module (3) and used for wastewater reflux in the secondary chemical treatment module (2), and a tertiary circulation unit (73) arranged between the tertiary biological treatment module (3) and the depth filtration treatment module (4) and used for wastewater reflux in the tertiary biological treatment module (3);
The primary circulation unit (71) comprises a solid content sensor (711) arranged at the outlet end of the primary physical treatment module (1), a secondary water inlet valve (712) arranged between the solid content sensor (711) and the secondary chemical treatment module (2), and a primary reflux valve (713) arranged between the solid content sensor (711) and the inlet end of the primary physical treatment module (1), wherein the primary reflux valve (713) is connected with the inlet end of the primary physical treatment module (1), and the solid content sensor (711) is respectively electrically connected with the primary reflux valve (713) and the secondary water inlet valve (712);
the secondary circulation unit (72) comprises a particle detection sensor (721) arranged at the outlet end of the secondary chemical treatment module (2), a tertiary water inlet valve (722) arranged between the particle detection sensor (721) and the tertiary biological treatment module (3), and a secondary reflux valve (723) arranged between the particle detection sensor (721) and the inlet end of the secondary chemical treatment module (2), wherein the secondary reflux valve (723) is connected with the inlet end of the secondary chemical treatment module (2), and the particle detection sensor (721) is respectively electrically connected with the secondary reflux valve (723) and the tertiary water inlet valve (722);
The three-stage circulation unit (73) comprises an organic matter sensor (731) arranged at the outlet end of the three-stage biological treatment module (3), a depth filtration water inlet valve (732) arranged between the organic matter sensor (731) and the depth filtration treatment module (4), and a three-stage reflux valve (733) arranged between the organic matter sensor (731) and the inlet end of the three-stage biological treatment module (3), wherein the three-stage reflux valve (733) is connected with the inlet end of the three-stage biological treatment module (3), and the organic matter sensor (731) is respectively electrically connected with the three-stage reflux valve (733) and the depth filtration water inlet valve (732).
10. A method for discharging waste water from a coal-fired power plant, comprising a waste water discharging system for a coal-fired power plant according to any one of claims 1 to 9, further comprising the steps of:
s1, intercepting large-particle solids in wastewater through the primary physical treatment module (1);
S2, detecting the content n Fixing device of the solid large particles discharged by the primary physical processing module (1) through the circulating processing module (7), wherein the content of the preset solid large particles is n Pre-preparation ;
When n Fixing device ＞n Pre-preparation is set, the circulating treatment module (7) guides the wastewater discharged by the primary physical treatment module (1) back into the primary physical treatment module (1);
when n Fixing device ≤n Pre-preparation is set, the primary physical treatment module (1) leads the wastewater into the secondary chemical treatment module (2) through the circulating treatment module (7);
S3, adding a coagulant into the wastewater through the secondary chemical treatment module (2) to agglomerate tiny particles in the wastewater into large particles and precipitate the large particles;
S4, detecting the content p Fixing device of the solid small particles discharged by the secondary chemical treatment module (2) through the circulating treatment module (7), wherein the content p Pre-preparation of the preset solid small particles;
when p Fixing device ＞p Pre-preparation is carried out, the circulating treatment module (7) leads the wastewater discharged by the secondary chemical treatment module (2) back into the secondary chemical treatment module (2);
When p Fixing device ≤p Pre-preparation is carried out, the secondary chemical treatment module (2) leads the wastewater into the tertiary biological treatment module (3) through the circulating treatment module (7);
s5, decomposing organic matters in the wastewater by the three-stage biological treatment module (3) through microorganisms;
S6, recovering heat and methane generated when microorganisms in the three-stage biological treatment module (3) decompose organic matters through the energy recovery module (6), and introducing the heat into the secondary chemical treatment module (2) and the primary physical treatment module (1);
S7, detecting the concentration m Has the following components of the organic matters in the wastewater discharged by the three-stage biological treatment module (3) through the circulating treatment module (7), wherein the concentration range of the preset organic matters is m Pre-preparation ;
When m Has the following components ＞m Pre-preparation is detected, the circulating treatment module (7) leads the wastewater discharged by the tertiary biological treatment module (3) back into the tertiary biological treatment module (3);
when m Has the following components ≤m Pre-preparation is detected, the three-stage biological treatment module (3) leads the wastewater into the depth filtration treatment module (4) through the circulating treatment module (7);
S8, filtering soluble pollutants and suspended matters in the wastewater through the depth filtration treatment module (4);
And S9, performing denitrification and dephosphorization on the wastewater through the marsh filtering module (5), removing heavy metals, and discharging the heavy metals to the outside.
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| JPH08238470A (en) * | 1995-03-03 | 1996-09-17 | Terukiyo Kitazawa | Waste treatment method and apparatus |
| CN109293141A (en) * | 2018-10-17 | 2019-02-01 | 河海大学 | An ecological purification device suitable for agricultural canal drainage outlet and using method |
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