CN214611892U

CN214611892U - Integrated treatment device for slag field leachate

Info

Publication number: CN214611892U
Application number: CN202023290914.6U
Authority: CN
Inventors: 吴智仁; 陈园园; 蒋素英; 李俊波; 沈亚东
Original assignee: JIANGSU ATK ENVIRONMENTAL ENGINEERING Ltd; Jiangsu Atk Environmental Engineering Design & Research Institute Co ltd
Current assignee: JIANGSU ATK ENVIRONMENTAL ENGINEERING Ltd; Jiangsu Atk Environmental Engineering Design & Research Institute Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-11-05
Anticipated expiration: 2030-12-31

Abstract

The utility model provides an integrated treatment device for slag yard leachate, which comprises a pretreatment tank, a sedimentation tank and a dosing tank; the pretreatment tank is connected with the sedimentation tank through a first pipeline; the dosing box is connected with the pretreatment tank through a second pipeline and a third pipeline; the dosing box is also connected with the first pipeline through a fourth pipeline; the bottom of the sedimentation tank is connected with the first pipeline through a fifth pipeline. The utility model provides a processing apparatus integrates of cinder yard filtration liquid through setting up consecutive dosing tank, preliminary treatment pond and sedimentation tank, realizes the processing of integrating of cinder yard filtration liquid, owing to reduced the processing step, still be favorable to reducing equipment quantity, effectively reduces cinder yard filtration liquid and integrates processing apparatus's area, realizes low-cost processing cinder yard filtration liquid, can also reduce the dose that adds, and reduce cost reduces secondary pollution.

Description

Integrated treatment device for slag field leachate

Technical Field

The utility model relates to a slag yard filtration liquid processing technology field particularly, relates to a slag yard filtration liquid integrate processing apparatus.

Background

The solid waste in the slag yard has complex components, and the main waste comprises coal ash, coal cinder, barium slag, calcium salt, magnesium salt, ferric oxide, barium sulfate, silicon dioxide, strontium salt, sodium salt, potassium salt and the like. The slag yard percolate is sewage generated by slag yard stack body extrusion, rainwater leaching or underground water erosion, contains a large amount of pollutants, and poses potential threat to the environment if an anti-seepage treatment measure is not adopted.

The current general treatment methods of the landfill leachate comprise a biochemical treatment method, a recharge treatment method, a membrane treatment method, an evaporation concentration treatment method, a chemical oxidation treatment method and the like; because the slag field leachate contains various organic and inorganic pollutants, such as a small amount of organic matters, ammonia nitrogen, barium ions, sulfides, salts and the like, the biochemical property is very poor, the biological toxicity is high, and the treatment is difficult by adopting a biochemical and recharge method; the membrane treatment method has good treatment effect on the domestic garbage percolate, but is not suitable for treating the percolate in the slag yard with more pollutants, and the cost of the membrane treatment is higher; the evaporation concentration treatment method has excellent effect of removing salt, but can not synchronously remove harmful substances such as ammonia nitrogen, sulfide and the like, and can discharge the harmful substances after reaching the standard after further treatment, thereby increasing the disposal cost; the chemical oxidation method has a good treatment effect on the slag field leachate, but the traditional oxidation methods, such as the Fenton oxidation method and the ozone oxidation method, have the disadvantages of complicated steps, more required equipment, large dosage, high cost and easy secondary pollution.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem that the traditional chemical oxidation method is complex in steps when treating the slag field leachate.

In order to solve the problems, the utility model provides an integrated treatment device for the slag yard percolate, which comprises a pretreatment tank, a sedimentation tank and a dosing tank; wherein the content of the first and second substances,

the pretreatment tank is connected with the sedimentation tank through a first pipeline;

the dosing box is connected with the pretreatment tank through a second pipeline and a third pipeline;

the dosing box is also connected with the first pipeline through a fourth pipeline;

the bottom of the sedimentation tank is connected with the first pipeline through a fifth pipeline.

Optionally, a micro-nano aerator is arranged at the bottom of the pretreatment tank; the bottom of the sedimentation tank is of a conical structure, and a spiral sludge thickener is arranged at the bottom of the sedimentation tank.

Optionally, an overflow structure is arranged on the inner wall of the sedimentation tank, and the overflow structure and the inner wall enclose to form a coagulation area; the first pipeline is connected to the bottom of the coagulation zone.

Optionally, the overflow structure includes first swash plate and the vertical first overflow plate that distributes of slope, the bottom of first swash plate with inner wall fixed connection, the top of first swash plate with the bottom fixed connection of first overflow plate.

Optionally, the inner wall of the sedimentation tank is further provided with a clear water bottom plate distributed along the horizontal direction and a vertical plate vertically connected with the clear water bottom plate; water inlet holes are uniformly formed in the clean water bottom plate; the clear water bottom plate, the vertical plate and the inner wall of the sedimentation tank enclose to form a clear water area; a water outlet is formed in the side wall of the clean water area; and a granulation area is formed between the vertical plate and the overflow structure.

Optionally, a second overflow plate is arranged above the clean water bottom plate, and the second overflow plate is detachably connected with the clean water bottom plate.

Optionally, the bottom end of the clean water bottom plate is provided with a plurality of second inclined plates which are distributed in an inclined manner, and a clean water rising channel is formed between every two adjacent second inclined plates.

Optionally, the bottom of the vertical plate is connected with a granulation inclined plate which is distributed obliquely, and the granulation vertical plate is connected to the bottom end of the granulation inclined plate, and the granulation vertical plate is distributed along the vertical direction.

Optionally, a porous distribution plate is arranged in the granulation zone, one end of the porous distribution plate is fixedly connected with the first overflow plate, and the other end of the porous distribution plate is fixedly connected with the vertical plate.

Optionally, an independent inclined plate is further arranged in the granulation zone, and the top end of the independent inclined plate is fixedly connected with the porous distribution plate.

Compared with the prior art, the utility model provides a slag yard filtration liquid integrate processing method has following advantage:

the utility model provides an integrated treatment device of slag yard filtration liquid, through setting up the dosing tank, preliminary treatment pond and the sedimentation tank that link to each other in proper order, realize the integrated treatment to slag yard filtration liquid, both can save the quantity of oxidant, avoid additionally adding conventional pH regulator, thus when improving the treatment effect to slag yard filtration liquid, can also reduce the dose that adds, reduce cost, reduce secondary pollution; in addition, because the treatment steps are reduced, the reduction of the number of equipment is facilitated, the occupied area of the integrated treatment device of the slag yard percolate is effectively reduced, and the low-cost treatment of the slag yard percolate is realized.

Drawings

Fig. 1 is a simplified structure diagram of an integrated treatment device for the slag yard leachate.

Description of reference numerals:

1-a pretreatment pool; 11-a first conduit; 2-a sedimentation tank; 21-an overflow structure; 211-a first swash plate; 212-a first overflow plate; 22-clear water bottom plate; 23-vertical plates; 24-a second overflow plate; 25-a second sloping plate; 26-granulation sloping plate; 27-vertical plate for granulation; 28-a porous distribution plate; 29-independent sloping plate; 3-adding a medicine box; 31-a second conduit; 32-a third line; 33-a fourth line; 4-a fifth pipeline; 5-a nano aerator; 6-spiral sludge thickener; 7-sixth pipeline.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for the purpose of simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first" and "second" are used merely to simplify the description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, a first feature "on" or "under" a first feature may comprise the first feature and a second feature in direct contact, or may comprise the first feature and the second feature not in direct contact but in contact with each other through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In order to solve the problem that the steps are complicated when the conventional chemical oxidation method is used for treating the slag yard leachate, the utility model provides an integrated treatment device for the slag yard leachate, which is shown in figure 1 and comprises a pretreatment tank 1, a sedimentation tank 2 and a dosing tank 3; the pretreatment tank 1 is used for pretreating the slag yard leachate, the pretreatment tank 1 is connected with the sedimentation tank 2 through a first pipeline 11, so that pretreatment liquid is conveyed into the sedimentation tank 2 through the first pipeline 11, sedimentation is performed through the sedimentation tank 2, sludge and treated effluent are layered, and recyclable water is obtained; the dosing tank 3 is used for storing an alkaline oxidant, ferrous sulfate and a flocculating agent, conveying the alkaline oxidant and the ferrous sulfate to the pretreatment tank 1, and conveying the flocculating agent to the sedimentation tank 2; for the convenience of administering the medicament, it is preferable that the medicament stored in the dosing tank 3 is a solution.

Further, the dosing tank 3 is connected to the pretreatment tank 1 through a second line 31 and a third line 32, and the alkaline oxidizing agent is conveyed to the pretreatment tank 1 through the second line 31, while the ferrous sulfate solution is conveyed to the pretreatment tank 1 through the third line 32.

The pretreatment tank 1 is preferably a semi-closed container which is in a cylindrical or square structure; the bottom of the pretreatment tank 1 is provided with a leachate feeding hole, and the leachate feeding hole is connected with a sixth pipeline 7 so as to convey the leachate in the slag yard into the pretreatment tank 1 through the sixth pipeline 7; and preferred first pipeline 11 is connected in the top of preliminary treatment pond 1 to make this preliminary treatment pond 1 form the structure of below feeding, the ejection of compact of top, so that make alkaline oxidant, ferrous sulfate and slag field filtration liquid fully react in preliminary treatment pond 1, integrate the processing to slag field filtration liquid, obtain pretreatment liquid, further carry pretreatment liquid to sedimentation tank 2 in through first pipeline 11.

In order to remove impurities and the like in the pretreatment liquid and ensure the treatment effect, the dosing tank 3 in the application conveys a flocculating agent to the pretreatment liquid through a fourth pipeline 33, so that the impurities in the pretreatment liquid form large-particle flocculating constituents through the flocculation effect of the flocculating agent, and the large-particle flocculating constituents are precipitated to form sludge; the fourth pipeline 33 can be connected with the sedimentation tank 2 and also can be connected with the first pipeline 11; for making flocculating agent and preliminary treatment liquid intensive mixing, the preferred dosing tank 3 of this application links to each other with first pipeline 11 through fourth pipeline 33 for after coagulant and preliminary treatment liquid intensive mixing, form mixed liquid, this mixed liquid gets into sedimentation tank 2, forms the large granule flocculating constituent gradually in sedimentation tank 2, and the large granule flocculating constituent deposits in sedimentation tank 2's bottom under the action of gravity, forms mud, with handle out water separation.

For promoting the formation of large granule flocculating constituent, the bottom of sedimentation tank 2 links to each other with first pipeline 11 through fifth pipeline 4 in this application to in carrying the pretreatment liquid through this fifth pipeline 4 with the partial mud of sedimentation tank 2 bottom, carry out the mud backward flow, increase the concentration of mud in the pretreatment liquid, be favorable to the formation of large granule flocculating constituent, thereby promote impurity to flocculate, improve the flocculation effect, improve flocculation efficiency. The specific sludge reflux ratio can be set according to requirements, and the preferable range of the sludge reflux ratio is 10-40%.

Furthermore, in the present application, it is preferable that the connection position of the fifth pipeline 4 and the first pipeline 11 is located upstream of the connection position of the fourth pipeline 33 and the first pipeline 11, that is, on the first pipeline 11, along the water flow direction, the sludge return port is located in front, and the flocculant charging port is located behind; alternatively, both may be provided in combination.

In the working process of the integrated treatment device for the slag yard percolate, the slag yard percolate is conveyed into the pretreatment tank 1 from a percolate feeding port through a continuous pump connected with a sixth pipeline 7, and meanwhile, an alkaline oxidant and ferrous sulfate are respectively conveyed into the pretreatment tank 1 through a second pipeline 31 and a third pipeline 32, so that the alkaline oxidant, the ferrous sulfate and the slag yard percolate fully react in the pretreatment tank 1 to obtain a pretreatment solution; the pretreatment liquid is further conveyed into the sedimentation tank 2 through a first pipeline 11, and is mixed with the return sludge and the flocculating agent in the first pipeline 11 to form a mixed liquid; conveying the mixed solution to a sedimentation tank 2, and granulating in the sedimentation tank 2 to form sludge particles; under the action of gravity, sludge particles are deposited at the bottom of the sedimentation tank 2, treated effluent which can be recycled is obtained at the upper part of the sedimentation tank 2, and the treated effluent is discharged.

The utility model provides a slag yard leachate integrates processing apparatus, through setting up the dosing tank 3 that links to each other in proper order, preliminary treatment pond 1 and sedimentation tank, make alkaline oxidant and ferrous sulfate synergism, the organic matter is got rid of in the synchronous oxidation, ammonia nitrogen and sulphide, reach the purpose that removes ammonia desulfurization and fall barium in step, realize the integrated processing to the slag yard leachate, both can save the quantity of oxidant, avoid additionally throwing conventional pH regulator, thereby when improving the treatment effect to the slag yard leachate, can also reduce the dosing amount, the cost is reduced, secondary pollution is reduced; in addition, because the treatment steps are reduced, the reduction of the number of equipment is facilitated, the occupied area of the integrated treatment device of the slag yard percolate is effectively reduced, and the low-cost treatment of the slag yard percolate is realized.

In the application, a micro-nano aerator 5 is arranged at the bottom of a pretreatment tank 1; through setting up micro-nano aerator 5, can not only make filtration liquid and the alkaline oxidant of throwing and ferrous sulfate intensive mixing, can also prolong the detention time of dissolved oxygen in filtration liquid, promote the utilization ratio of available oxygen, supplementary alkaline oxidant's oxidation, further improve oxidation efficiency, save alkaline oxidant's quantity.

The micro-nano aerator is preferably selected from a 5OHR cyclone aerator and a multi-cylinder secondary jet aerator.

In order to improve the sedimentation efficiency, the bottom of the sedimentation tank 2 is preferably of a conical structure, and the bottom of the sedimentation tank 2 is provided with a spiral sludge thickener 6, so that the sludge at the bottom of the sedimentation tank 2 can be discharged through the spiral sludge thickener 6.

In the application, an overflow structure 21 is arranged on the inner wall of the sedimentation tank 2, and the overflow structure 21 and the inner wall enclose to form a coagulation area; first pipeline 11 is connected in the bottom in district that congeals to make through first pipeline 11 with mixed liquid carry to the bottom in district that congeals, the mixed liquid of being convenient for stirs, make coagulant in the mixed liquid and the further abundant reaction back of filtration liquid, discharge from overflow structure 21's top again, in order to further improve the flocculation effect, improve the settling velocity, improve the disposal efficiency that slag yard filtration liquid integrated processing apparatus.

Specifically, overflow structure 21 includes the first swash plate 211 of slope distribution and the first overflow plate 212 of vertical distribution, the bottom and the inner wall fixed connection of first swash plate 211, the top of first swash plate 211 and the bottom fixed connection of first overflow plate 212 to make the district that thoughtlessly congeals that forms between the inner wall of this overflow structure 21 and sedimentation tank 2, the bottom is the toper structure, forms the slope and thoughtlessly congeals the district, improves mixed effect.

The inner wall of the sedimentation tank 2 is also provided with a clear water bottom plate 22 which is distributed along the horizontal direction and a vertical plate 23 which is vertically connected with the clear water bottom plate 22; water inlet holes are uniformly formed in the clean water bottom plate 22; the clear water bottom plate 22, the vertical plate 23 and the inner wall of the sedimentation tank 2 enclose to form a clear water area; a water outlet is arranged on the side wall of the clean water area, and treated effluent in the clean water area is discharged through the water outlet; a granulation zone is formed between the vertical plate 23 and the overflow structure 21.

When the sedimentation tank 2 is of a closed structure, namely a top plate is arranged above the sedimentation tank 2, preferably, the top end of the vertical plate 23 is fixedly connected with the top plate of the sedimentation tank 2; if other top of sedimentation tank 2 is when being provided with the roof, the top of preferred first overflow plate 212 is less than the top of vertical board 23 to avoid mixed liquid to spill over the back from the top of first overflow plate 212, directly get into the clear water district, influence the quality of water of handling out water.

In the working process of the integrated treatment device for the slag field leachate, after the mixed liquor is fully mixed in the coagulation area, the mixed liquor overflows from the top of the first overflow plate 212, enters a granulation area between the vertical plate 23 and the overflow structure 21, and is gradually flocculated in the granulation area to form sludge particles; under the action of gravity, sludge particles are gradually deposited at the bottom of the sedimentation tank 2 to obtain a sludge layer, and meanwhile, clean treated effluent is obtained above the sludge layer; the treated effluent further passes through water inlets uniformly distributed on the clean water bottom plate 22, enters the clean water area, and is discharged through a water outlet.

The application further prefers to be provided with the filtering structure on the clean water bottom plate 22, so that the treated water is discharged after being filtered through the filtering structure, and the treatment effect is improved.

The second overflow plate 24 is preferably arranged above the clean water bottom plate 22; the overflow mode in the application can adopt wide top overflow, triangular edge overflow or porous overflow; further, the second overflow plate 24 is preferably detachably connected to the clean water bottom plate 22, and the detachable connection may be a bolt connection, so as to adjust the height of the second overflow plate 22.

In the application, the bottom end of the clear water bottom plate 22 is provided with a plurality of obliquely distributed second inclined plates 25, and a clear water rising channel is formed between every two adjacent second inclined plates 25; the interval between the adjacent second inclined plates 25 is preferably in the range of 25cm to 50cm in the present application.

In the sedimentation tank 2, the mixed liquid enters a granulation zone from the coagulation zone, and enters a sedimentation zone positioned below the clear water zone after granulation; in this settlement zone, the mud of large granule separates with liquid, and mud deposit gets into the clear water district in the bottom of sedimentation tank 2, gets rid of behind the mud granule, and the clear water that obtains is through the ascending passageway that a plurality of second swash plates 25 constitute to make the clear water at the in-process that rises, the remaining suspended solid of aquatic enters the clear water district again along the second swash plate 25 degree of depth sediment back that the slope set up, with improvement treatment effect.

This application forms the passageway that rises through the second swash plate 25 that sets up the slope setting for the clear water further carries out the degree of depth through second swash plate 25 and deposits at the in-process that gets into clear water district, thereby reduces the impurity of handling the aquatic, improves the quality of water of handling the water.

The bottom of vertical board 23 is connected with the granulation swash plate 26 that the slope distributes in this application to and connect in the vertical board 27 of granulation swash plate 26 bottom, vertical board 27 of granulation distributes along vertical direction.

By arranging the granulation inclined plate 26 and the granulation vertical plate 27, the granulation inclined plate 26, the granulation vertical plate 27 and the overflow structure 21 are enclosed to form a descending channel of a granulation area; the mixed liquor rolls along a granulation inclined plate 26 in a descending channel of the granulation zone for granulation, and then enters a precipitation zone through the bottom of a granulation vertical plate 27, so that the mixed liquor is buffered by the granulation vertical plate 27 and descends into the precipitation zone, further, granulated sludge particles are sunk into the bottom of the precipitation tank 2, and then the sludge is discharged through a spiral sludge concentrator 6.

By arranging the granulation inclined plate 26 and the granulation vertical plate 27, on one hand, the mixed liquid is favorably rolled along the granulation inclined plate 26 while sludge flocs in the mixed liquid wrap loose suspended matters in the surrounding water in the descending process of the mixed liquid, so that large-particle sludge flocs are formed, the sedimentation separation is favorably realized, the granulation is realized by rolling along the granulation inclined plate 26, the granulation efficiency is improved, the removal rate of impurities in percolate is improved, and the treatment effect is improved; on the other hand, the mixed liquid circulates in the sedimentation tank 2 along the S-shaped channel formed by the first overflow plate 212, the granulation inclined plate 26, the granulation vertical plate 27 and the second inclined plate 25, so that the mixing and settling time of the mixed liquid in the sedimentation tank 2 is prolonged, the granulation speed is increased by the contact of the mixed liquid and each plate-shaped structure in the circulating process, the treatment efficiency is improved, and the removal rate of impurities is improved.

Further, a porous distribution plate 28 is arranged in the granulation zone in the present application, one end of the porous distribution plate 28 is fixedly connected with the first overflow plate 212, and the other end is fixedly connected with the vertical plate 23.

The vertical channel of granulation district is formed between first overflow plate 212 and the vertical board 23, through setting up porous distributing plate 28, makes the mixed solution get into the slope passageway in the granulation district after further homogeneous mixing, improves the clearance to impurity in the leachate.

In the present application, an independent inclined plate 29 is disposed in the granulation zone, and the top end of the independent inclined plate 29 is fixedly connected with the porous distribution plate 28.

Through setting up independent swash plate 29 for in the inclined channel in granulation district, form multichannel structure, increase the area of contact of mixed liquid and swash plate, and then further mention granulation speed.

The surface load of the traditional sedimentation tank is generally in the range of 0.5-3.0 m³/m²H, after solid-liquid separation, the effluent SS can not reach the discharge standard, and the tail end of the process needs to be matched with a special filter for use, so that the cost investment is large; the sedimentation tank 2 in the integrated treatment device for the percolate in the slag yard breaks through the design bottleneck of simplification of the water flow direction in the conventional sedimentation tank, adopts a two-section SS separation structure formed by combining downward flow and upward flow in an ingenious design, greatly exerts and exceeds the performance of the conventional sedimentation tank, has a compact structure and the same treatment capacity, has the design area of only 1/10-1/5 of the conventional sedimentation device, and is high in surface load and sedimentation efficiency; in the sedimentation tank 2 provided by the application, the SS concentration of the effluent after sedimentation treatment is generally less than 5ppm (slightly different according to different water qualities); the SS of the treated water is below 5ppm, and a subsequent filtering unit or a relatively small filtering device is not required to be added generally.

The utility model provides a processing apparatus that integrates of slag yard filtration liquid's integrated processing method of the following slag yard filtration liquid of slag yard filtration liquid comes to handle the slag yard filtration liquid, and this integrated processing method includes following step:

s1: simultaneously adding an alkaline oxidant and ferrous sulfate into the slag yard leachate, and pretreating the slag yard leachate at normal temperature to obtain a pretreatment solution;

s2: adding a flocculating agent into the pretreatment liquid to obtain a mixed liquid;

s3: and precipitating the mixed solution to obtain sludge and treated effluent on the upper layer of the sludge.

The slag yard leachate in the application refers to leachate of chemical slag yard wastes, and the slag yard leachate contains organic matters, ammonia nitrogen, a large amount of sulfide, barium ions, salt and a small amount of heavy metal ions such as strontium, vanadium, chromium and the like; specifically, the concentration range of the pollutant COD in the slag yard percolate is 500 mg/L-1500 mg/L, the concentration range of ammonia nitrogen is 50 mg/L-300 mg/L, the concentration range of sulfide is 300 mg/L-900 mg/L, the concentration range of barium ion is 40000 mg/L-100000 mg/L, and the biodegradability is extremely poor.

In the pretreatment step, the added alkaline oxidant efficiently oxidizes organic matters and ammonia nitrogen to remove the organic matters and ammonia nitrogen in the leachate on one hand, and on the other hand, the alkaline environment is provided by the alkaline oxidant to enable iron salt to form precipitate so as to achieve the aim of coagulation; the added ferrous sulfate plays a role of a coagulant on one hand, and on the other hand, provided ferrous ions can form a precipitate with sulfur ions to remove sulfides; meanwhile, sulfate ions and metal ions such as barium ions are combined to form precipitates, so that the precipitates are accelerated, the treatment time is shortened, the treatment efficiency is improved, and the precipitation effect is improved.

In order to ensure the pretreatment effect, the reaction time of the pretreatment process is preferably in the range of 0.5h to 3h, and the reaction time is further preferably in the range of 1h to 2 h.

Further, adding a flocculating agent into the pretreatment liquid to flocculate impurities to obtain a mixed liquid containing flocs; and further precipitating the mixed solution to obtain sludge at the bottom and treated effluent at the upper layer of the sludge, wherein the treated effluent at the upper layer is recyclable water obtained after treatment.

The utility model provides a processing method integrates of slag yard filtration liquid through alkaline oxidant and ferrous sulfate synergism, and synchronous oxidation gets rid of organic matter, ammonia nitrogen and sulphide, reaches the purpose that removes ammonia desulfurization and fall barium in step, simultaneously, both can save the quantity of oxidant, avoids additionally throwing conventional pH regulator to improve the treatment effect to slag yard filtration liquid, can also reduce and add the dose, reduce cost reduces secondary pollution.

The application provides a processing method integrates of slag yard filtration liquid combines the composition of pollutant in the slag yard filtration liquid, comes to get rid of organic matter, ammonia nitrogen and sulphide in step through alkaline oxidant and ferrous sulfate synergism, removes ammonia simultaneously and desulfurizes and falls barium, has realized the processing of integrating of pollutant in the slag yard filtration liquid, has reduced the processing step, has simplified processing technology.

Further, in order to improve the flocculation effect, the integrated treatment method of the slag yard leachate provided by the application can further comprise the following steps:

s4: adding part of sludge into the pretreatment liquid.

Through adding partial mud to carry out the mud backward flow in handling liquid as to, increase the concentration of mud in the preliminary treatment liquid, be favorable to the formation of large granule flocculating constituent to promote impurity to flocculate, improve the flocculation effect, improve flocculation efficiency. The specific sludge reflux ratio can be set according to requirements, and the preferable range of the sludge reflux ratio is 10-40%.

In order to ensure the treatment effect on the leachate in the slag yard, the alkaline oxidant preferably comprises sodium hypochlorite; the integrated treatment of pollutants in the leachate of the slag yard is realized through the synergistic effect of the sodium hypochlorite and the ferrous sulfate.

The flocculant is preferably selected from at least one of polyacrylamide, sodium alginate and diatomite.

In order to ensure the integration treatment effect, the alkaline oxidant, the ferrous sulfate and the flocculating agent are preferably added in a solution mode; specifically, the mass concentration range of sodium hypochlorite is preferably 10-20%, and the adding amount of sodium hypochlorite is preferably 10-30 ml/L; the mass concentration range of the ferrous sulfate is 10-30%, and the adding amount of the ferrous sulfate is 20-40 mg/L; the mass concentration range of the flocculating agent is 0.06-0.5%, and the adding amount range of the flocculating agent is 0.5-5 mg/L.

Furthermore, the integrated treatment method of the slag yard leachate provided by the application can further comprise an aeration process in the pretreatment step, so that the slag yard leachate is more uniformly mixed with the added alkaline oxidant and ferrous sulfate through aeration, the detention time of the dissolved oxygen in the leachate is prolonged, the utilization rate of the available oxygen is improved, the oxidation effect of the alkaline oxidant is assisted, the oxidation efficiency is further improved, the using amount of the oxidant is saved, and the adding amount of the oxidant is reduced.

By the integrated treatment method of the slag yard percolate provided by the utility model, the SS concentration of the treated effluent is generally less than 5ppm (slightly different according to different water qualities); the SS of the treated water is below 5ppm, and a subsequent filtering unit or a relatively small filtering device is not required to be added generally.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims

1. An integrated treatment device for slag yard percolate is characterized by comprising a pretreatment tank (1), a sedimentation tank (2) and a dosing tank (3); wherein the content of the first and second substances,

the pretreatment tank (1) is connected with the sedimentation tank (2) through a first pipeline (11);

the dosing tank (3) is connected with the pretreatment tank (1) through a second pipeline (31) and a third pipeline (32);

the dosing box (3) is also connected with the first pipeline (11) through a fourth pipeline (33);

the bottom of the sedimentation tank (2) is connected with the first pipeline (11) through a fifth pipeline (4).

2. The integrated treatment device of the slag yard percolate according to claim 1, wherein the bottom of the pretreatment tank (1) is provided with a micro-nano aerator (5); the bottom of the sedimentation tank (2) is of a conical structure, and the bottom of the sedimentation tank (2) is provided with a spiral sludge thickener (6).

3. The integrated treatment device of the slag yard percolate according to claim 1 or 2, wherein an overflow structure (21) is arranged on the inner wall of the sedimentation tank (2), and the overflow structure (21) and the inner wall enclose to form a coagulation zone; the first pipe (11) is connected to the bottom of the coagulation zone.

4. The integrated treatment device for the slag yard leachate of claim 3, wherein the overflow structure (21) comprises first inclined plates (211) distributed obliquely and first overflow plates (212) distributed vertically, the bottom ends of the first inclined plates (211) are fixedly connected with the inner wall, and the top ends of the first inclined plates (211) are fixedly connected with the bottom ends of the first overflow plates (212).

5. The integrated treatment device of the slag yard leachate according to claim 4, wherein the inner wall of the sedimentation tank (2) is further provided with a clean water bottom plate (22) distributed along the horizontal direction and a vertical plate (23) vertically connected with the clean water bottom plate (22); water inlet holes are uniformly formed in the clear water bottom plate (22); the clear water bottom plate (22), the vertical plate (23) and the inner wall of the sedimentation tank (2) enclose to form a clear water area; a water outlet is formed in the side wall of the clean water area; a granulation zone is formed between the vertical plate (23) and the overflow structure (21).

6. The integrated treatment device for the leachate in the slag yard of claim 5, wherein a second overflow plate (24) is arranged above the clean water bottom plate (22), and the second overflow plate (24) is detachably connected with the clean water bottom plate (22).

7. The integrated treatment device for the slag yard leachate according to claim 6, wherein the bottom end of the clean water bottom plate (22) is provided with a plurality of second inclined plates (25) which are distributed in an inclined manner, and a clean water ascending channel is formed between the adjacent second inclined plates (25).

8. The integrated treatment device for the slag field leachate of claim 5, wherein the bottom of the vertical plate (23) is connected with an inclined granulation plate (26) which is distributed obliquely, and a vertical granulation plate (27) which is connected to the bottom end of the inclined granulation plate (26), and the vertical granulation plate (27) is distributed vertically.

9. The integrated treatment device for the landfill leachate according to claim 5, wherein a porous distribution plate (28) is arranged in the granulation zone, one end of the porous distribution plate (28) is fixedly connected with the first overflow plate (212), and the other end is fixedly connected with the vertical plate (23).

10. The integrated treatment device for the slag yard leachate according to claim 9, wherein an independent inclined plate (29) is obliquely arranged in the granulation zone, and the top end of the independent inclined plate (29) is fixedly connected with the porous distribution plate (28).