CN216808439U - Combined device for post-treatment of salt-containing landfill leachate - Google Patents
Combined device for post-treatment of salt-containing landfill leachate Download PDFInfo
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- CN216808439U CN216808439U CN202220959827.5U CN202220959827U CN216808439U CN 216808439 U CN216808439 U CN 216808439U CN 202220959827 U CN202220959827 U CN 202220959827U CN 216808439 U CN216808439 U CN 216808439U
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Abstract
The utility model relates to a combined device for post-treatment of salt-containing landfill leachate, which comprises a circulating barrel, an electrochemical reactor, a coagulation tank and a horizontal pipe sedimentation tank which are connected in sequence; the circulating barrel is connected with a first water inlet of the electrochemical reactor through a pipeline and a water pump, and a backflow water outlet at the lower part of the electrochemical reactor is connected with a backflow water inlet in the middle of the circulating barrel through a backflow pipe; aeration devices are arranged at the bottoms of the electrochemical reactor and the coagulation tank; the well upper portion of horizontal pipe sedimentation tank is equipped with a plurality of rows of baffles, forms between the adjacent baffle and arranges the mud slide, and one side of baffle evenly sets up a plurality of swash plate. The electrochemical reactor can degrade refractory organic matters, and greatly reduce secondary pollution. The return water reduces the pollution load of the sewage in the circulating barrel. Muddy water after the electrochemical reactor is treated is discharged into the horizontal pipe sedimentation tank for sedimentation after coagulation, and the partition plate forms a mud discharge slideway, so that the quick mud-water separation is facilitated.
Description
Technical Field
The utility model belongs to the technical field of landfill leachate equipment, and particularly relates to a combined device for post-treatment of salt-containing landfill leachate.
Background
With the rapid development of national economy and the continuous acceleration of urban and rural integrated process, the annual output of domestic garbage in China also rises rapidly. At present, sanitary landfill, incineration and composting are the main modes of domestic garbage treatment in China, wherein the sanitary landfill method is simple and convenient to operate, low in cost, mature in technology and a common treatment method. The landfill leachate is high-concentration organic wastewater formed by domestic garbage through self organic matter decomposition, rainwater leaching and other processes in the sanitary landfill process, and has complex components and high ammonia nitrogen, total nitrogen and COD concentration. The results of the analysis of the organic matter components in the leachate by many scholars at home and abroad show that the leachate contains dozens to hundreds of organic pollutants, wherein the leachate contains more alkanes and aromatic hydrocarbons. Because the components of the landfill leachate are complex and part of the landfill leachate has toxicity, the standard treatment of the landfill leachate is very important for life safety and environmental protection.
Generally, the landfill leachate treatment method comprises the following steps: the method comprises the following steps of activated carbon adsorption, chemical precipitation, chemical oxidation, biological method, membrane separation and advanced oxidation treatment, wherein the biological method has higher energy efficiency. However, the landfill leachate after biochemical treatment generally contains intermediate products, the intermediate products are obtained by incompletely oxidizing straight-chain long alkane and higher-boiling-point organic matters, and are difficult to completely remove by a biological method, the phosphorus removal rate and the stability of the method are poor, phosphorus is released again during the treatment of excess sludge, so that the ammonia nitrogen, total nitrogen, COD and total phosphorus concentration of biochemical effluent cannot reach the discharge standard, and a reverse osmosis process is required to be added, so that the effluent reaches the pollution control standard.
However, for the salt-containing landfill leachate, the salt-containing landfill leachate generally damages reverse osmosis equipment due to high-content sulfate ions, chloride ions and hardness ions, causes problems such as scaling, corrosion, membrane blockage and the like, increases difficulty in operation and maintenance, greatly increases operation cost, and cannot ensure long-term stability of effluent. In addition, a more concentrated and more hazardous reverse osmosis concentrate is produced.
In recent years, advanced oxidation methods have been considered as the most promising methods for treating refractory organics in water due to their characteristics of strong oxidation ability and no secondary pollution. Common advanced oxidation methods include ozone oxidation, electrolysis, photocatalytic oxidation, Fenton's reagent, and combinations thereof. In particular, compared with the Fenton method, the electrooxidation method only depends on electricity as an energy source, does not generate chemical sludge, does not cause secondary pollution, and is a clean and stable method. Compared with the ozone oxidation method, the reaction of ozone and organic matters is selective, all the organic matters cannot be decomposed, and the oxidation depth of the electrooxidation method is higher. Among them, BDD is the best electrode in the field of electric oxidation, and has good stability, long electrode life and pollutant degradation rate close to 100%. The BDD electrolysis process mainly can reduce COD in sewage, decompose organic matters which are difficult to biodegrade into micromolecular organic matters, convert organic phosphorus into inorganic phosphorus, and the wastewater has higher conductivity under the condition of containing salt, so that the BDD electrolysis process provides good conditions for the application of an electrolysis method.
In order to realize the purpose of synchronously removing the total phosphorus, the subsequent treatment of dosing flocculation and precipitation is required. Because the sedimentation performance of suspended matters in the salt-containing wastewater is poor, when water flows through a common inclined plate (pipe), the direction of the water flow needs to be changed, the state of the water flow is changed, the sedimentation of the suspended matters is not facilitated, in the process, the settled suspended matters can be washed and stirred, and the settled suspended matters can be often re-stirred by the water flow, so that the reversible sedimentation of the suspended matters is caused; when an inclined plate (pipe) component is additionally arranged, two triangular dead water areas can be formed, the space utilization rate of the sedimentation tank is reduced, the water flow area is reduced, and the load of the sedimentation tank is reduced.
In view of the above problems, in order to make the quality of effluent water treated by landfill leachate reach high standard, it is necessary to improve the existing treatment device of the landfill leachate after biochemical treatment, and to perfect the existing BDD electrolysis technology and the matched coagulating sedimentation technology, so that the device can remove COD, ammonia nitrogen and total nitrogen which are difficult to degrade at biochemical tail ends, and also can discharge SS and total phosphorus in wastewater in a standard manner under the conditions of high salinity and high buoyancy, and has important significance for realizing deep and harmless treatment of the landfill leachate.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides a combined device for post-treatment of salt-containing landfill leachate, which comprises a circulating barrel, an electrochemical reactor, a coagulation tank and a horizontal pipe sedimentation tank which are sequentially connected; the circulating barrel is connected with a first water inlet of the electrochemical reactor through a pipeline and a water pump, and a backflow water outlet at the lower part of the electrochemical reactor is connected with a backflow water inlet in the middle of the circulating barrel through a backflow pipe;
aeration devices are arranged at the bottoms of the electrochemical reactor and the coagulation tank;
the well upper portion of horizontal pipe sedimentation tank is equipped with a plurality of rows of baffles, forms between the adjacent baffle and arranges the mud slide, and one side of baffle evenly sets up a plurality of swash plate.
Optionally, a second water inlet is arranged at the upper part of the circulating barrel, and the circulating barrel is used for storing the garbage percolate after biochemical treatment and waste liquid returned from the electrochemical reactor; the water pump is preferably a peristaltic pump.
Optionally, a first water inlet is arranged at the top of the electrochemical reactor, the backflow water outlet is arranged on the side wall of the electrochemical reactor on the same side as the first water inlet, and a first water outlet is arranged in the middle of the side wall of the electrochemical reactor on the opposite side of the first water inlet.
Optionally, a plurality of anode plates and a plurality of cathode plates are arranged inside the electrochemical reactor, the anode plates and the cathode plates are arranged at intervals, the anode plates are selected from a boron-doped diamond film electrode BDD anode plate, a Fe film electrode anode plate or an Al film electrode anode plate, and the cathode plates are preferably stainless steel film electrode cathode plates.
As a specific implementation mode, a stainless steel film electrode cathode plate, a boron-doped diamond film electrode BDD anode plate, a stainless steel film electrode cathode plate, a Fe film electrode anode plate, a stainless steel film electrode cathode plate, an Al film electrode anode plate and a stainless steel film electrode cathode plate are sequentially arranged.
Further optionally, the anode plate is electrically connected to an anode plate power interface of the dc power supply, the cathode plate is electrically connected to a cathode plate power interface of the dc power supply, and the dc power supply is disposed outside the electrochemical reactor.
Optionally, the combined device further comprises a roots blower, the roots blower is arranged outside the electrochemical reactor; the bottom of the electrochemical reactor is provided with a first aeration device, the bottom of the coagulation tank is provided with a second aeration device, and the roots blower is connected with the first aeration device and the second aeration device in parallel through an air pipe.
Optionally, the combined device further comprises a flocculant storage tank, a third water inlet and a second water outlet are respectively arranged on the upper portions of the two sides of the coagulation tank, a dosing port is arranged at the top of the coagulation tank, the flocculant storage tank is connected with the dosing port through a metering pump and a dosing pipe, and the first water outlet of the electrochemical reactor is connected with the third water inlet.
Optionally, the top of the horizontal pipe sedimentation tank is provided with a fourth water inlet, the middle of the horizontal pipe sedimentation tank is provided with a third water outlet, the bottom of the horizontal pipe sedimentation tank is provided with a sludge discharge port, and the second water outlet of the coagulation tank is connected with the fourth water inlet through a connecting pipe.
Optionally, the horizontal pipe sedimentation tank includes disengagement zone and settling zone from top to bottom, the disengagement zone includes the baffle of a plurality of rows slopes, and the baffle evenly is equipped with a plurality of swash plate towards one side of adjacent baffle, and the swash plate on the same baffle is parallel to each other and is certain inclination with the baffle, forms the row's mud slide between the adjacent baffle for carry out quick mud-water separation.
Further optionally, the angle between the partition plate and the horizontal line is 50-70 degrees, and the angle between the partition plate and the inclined plate is 20-30 degrees.
Preferably, the bottom of the settling zone is conical, so that sludge is conveniently discharged.
The combined device for post-treatment of the salt-containing landfill leachate has the following beneficial effects:
the electrochemical reactor can degrade refractory organic matters, and greatly reduce secondary pollution; the return water reduces the pollution load of the sewage in the circulating barrel; muddy water after the electrochemical reactor is treated is discharged into the horizontal pipe sedimentation tank for sedimentation after coagulation, and the partition plate forms a mud discharge slideway, so that the quick mud-water separation is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of the combined device for post-treatment of salt-containing landfill leachate.
In the attached drawing, a 1.1 circulating barrel, a 1.1.1 water pump, a 1.1.2 second water inlet, a 1.1.3 backflow water inlet, a 1.2 electrochemical reactor, a 1.2.1 first water inlet, a 1.2.2 direct current power supply, a 1.2.3 boron-doped diamond film electrode BDD anode plate, a 1.2.4 Fe film electrode anode plate, a 1.2.5 Al film electrode anode plate, a 1.2.6 stainless steel film electrode cathode plate, a 1.2.7 anode plate power supply interface, an 1.2.8 cathode plate power supply interface, a 1.2.9 first aeration device, a 1.2.10 first water outlet, a 1.2.11 backflow water outlet, a 1.3 Roots blower, a 1.4 coagulation tank, a 1.4.1 third water inlet, a 1.4.2 flocculating agent storage tank, a 1.4.3 metering pump, a 1.4.4.4 second device, a 1.5 second water outlet, a 1.4.6 dosing port, a 1.5 horizontal settling tank, a 1.5 settling tank, a 1.5.2 flocculating agent storage tank, a 1.3 dosing pump, a 1.5 sludge discharge pipe, a 1.6 inclined plate, a sludge discharge baffle, a sludge discharge pipe, a 1.6 inclined plate, a sludge discharge baffle, a sludge discharge pipe, a 1.6 inclined plate, a sludge discharge pipe, a 1.6 inclined plate, a sludge discharge baffle, a 1.6 inclined plate, a sludge discharge pipe, a sludge discharge port.
Detailed Description
The combined device for post-treatment of salt-containing landfill leachate described in this embodiment, as shown in fig. 1, includes a circulating tank 1.1, an electrochemical reactor 1.2, a coagulation tank 1.4 and a horizontal pipe sedimentation tank 1.5, which are connected in sequence; the circulating barrel 1.1 is connected with a first water inlet 1.2.1 of the electrochemical reactor through a pipeline and a water pump 1.1.1, and a return water outlet 1.2.11 at the lower part of the electrochemical reactor is connected with a return water inlet 1.1.3 at the middle part of the circulating barrel 1.1 through a return pipe 1.6;
aeration devices are arranged at the bottoms of the electrochemical reactor 1.2 and the coagulation tank 1.4;
the well upper portion of horizontal pipe sedimentation tank 1.5 is equipped with a plurality of rows of baffle 1.5.3, forms between the adjacent baffle 1.5.3 and arranges mud slide 1.5.4, and one side of baffle 1.5.3 evenly sets up a plurality of swash plate 1.5.2.
Optionally, a second water inlet 1.1.2 is arranged at the upper part of the circulating barrel 1.1, and the circulating barrel is used for storing the garbage percolate subjected to biochemical treatment and waste liquid returned from the electrochemical reactor 1.2; the water pump 1.1.1 is preferably a peristaltic pump.
Optionally, the top of the electrochemical reactor 1.2 is provided with a first water inlet 1.2.1, the return water outlet 1.2.11 is arranged on the side wall of the electrochemical reactor on the same side as the first water inlet 1.2.1, and the middle of the side wall of the electrochemical reactor opposite to the first water inlet 1.2.1 is provided with a first water outlet 1.2.10.
Optionally, a plurality of anode plates and a plurality of cathode plates are arranged inside the electrochemical reactor 1.2, the anode plates and the cathode plates are arranged at intervals, the anode plates are selected from a boron-doped diamond film electrode BDD anode plate 1.2.3, a Fe film electrode anode plate 1.2.4 or an Al film electrode anode plate 1.2.5, and the cathode plates are preferably stainless steel film electrode cathode plates 1.2.6.
As a specific implementation mode, a stainless steel membrane electrode cathode plate 1.2.6, a boron-doped diamond membrane electrode BDD anode plate 1.2.3, a stainless steel membrane electrode cathode plate 1.2.6, a Fe membrane electrode anode plate 1.2.4, a stainless steel membrane electrode cathode plate 1.2.6, an Al membrane electrode anode plate 1.2.5 and a stainless steel membrane electrode cathode plate 1.2.6 are sequentially arranged.
Further optionally, the anode plate is electrically connected to the anode plate power interface 1.2.7 of the dc power supply 1.2.2, the cathode plate is electrically connected to the cathode plate power interface 1.2.8 of the dc power supply, and the dc power supply 1.2.2 is disposed outside the electrochemical reactor 1.2.
Optionally, the combined device further comprises a roots blower 1.3, and the roots blower 1.3 is arranged outside the electrochemical reactor 1.2; the bottom of the electrochemical reactor 1.2 is provided with a first aeration device 1.2.9, the bottom of the coagulation tank 1.4 is provided with a second aeration device 1.4.4, and the Roots blower 1.3 is connected with the first aeration device 1.2.9 and the second aeration device 1.4.4 in parallel through an air pipe.
Optionally, the combined device further includes a flocculant storage tank 1.4.2, the upper portions of the two sides of the coagulation tank 1.4 are respectively provided with a third water inlet 1.4.1 and a second water outlet 1.4.5, the top portion is provided with a dosing port 1.4.6, the flocculant storage tank 1.4.2 is connected with the dosing port 1.4.6 through a metering pump 1.4.3 and a dosing pipe 1.8, and the first water outlet 1.2.10 of the electrochemical reactor is connected with the third water inlet 1.4.1.
Optionally, the top of the horizontal pipe sedimentation tank 1.5 is provided with a fourth water inlet 1.5.1, the middle is provided with a third water outlet 1.5.7, the bottom is provided with a sludge discharge port 1.5.6, and the second water outlet 1.4.5 of the coagulation tank is connected with the fourth water inlet 1.5.1 through a connecting pipe 1.9.
Optionally, horizontal pipe sedimentation tank 1.5 includes disengagement zone and sedimentation zone 1.5.5 from top to bottom, the disengagement zone includes the baffle 1.5.3 of a plurality of rows slope, and baffle 1.5.3 is equipped with towards one side of adjacent baffle and evenly sets up a plurality of swash plate 1.5.2, and the swash plate 1.5.2 on the same baffle 1.5.3 is parallel to each other and is certain inclination with the baffle, forms row mud slide 1.5.4 between the adjacent baffle for carry out quick mud-water separation.
Further optionally, the angle formed by the partition board 1.5.3 and the horizontal line is 50-70 degrees, and the angle formed by the partition board 1.5.3 and the inclined board 1.5.2 is 20-30 degrees.
Preferably, the bottom of the settling zone 1.5.5 is conical, so that sludge is conveniently discharged.
The landfill leachate enters a circulating barrel 1.1 after front end biochemical treatment, enters an electrochemical reactor 1.2 through a first water inlet 1.2.1 under the lifting of a water pump 1.1.1, is accessed to a direct current power supply 1.2.2 through an anode plate power supply interface 1.2.7 and a cathode plate power supply interface 1.2.8, is subjected to electron losing of an anode plate 1.2.3 of a boron-doped diamond film electrode BDD, is directly oxidized to generate hydroxyl radicals and the like, so that organic matters which are difficult to biochemically open and break chains, the remaining part of COD which is difficult to degrade is removed, carbon-phosphorus bonds of organic phosphorus are destroyed, hypophosphite is oxidized to orthophosphate, the organic phosphorus is converted to inorganic phosphorus, ammonia nitrogen is further oxidized, and the removal rate of ammonia nitrogen is improved.
The Fe film electrode anode plate 1.2.4 and the Al film electrode anode plate 1.2.5 obtain electrons, and release iron salt and aluminum salt, part of nitrate nitrogen is reduced, and the iron and aluminum salt play a flocculation role on phosphorus, and the dosage of part of external flocculant is reduced.
And the Roots blower 1.3 and the first aeration device 1.2.9 are used for aeration, so that the wastewater in the electrochemical reactor is fully mixed, part of SS is prevented from depositing in the region, the flow of the liquid at the return water outlet 1.2.11 is controlled, and the ton water power consumption of the optimal water treatment reaching the standard is regulated and controlled according to the water quality condition.
Electrolyzed water automatically flows into a coagulation tank 1.4, a flocculant storage tank 1.4.2 automatically adds PAM + PAC flocculant into the coagulation tank 1.4 under the action of a metering pump 1.4.3, a second aeration device 1.4 fully mixes the medicament with sewage, the electrolyzed water is cooled, the flocculant generates alum flocs in the coagulation tank, the alum flocs are fully decomposed with the sewage, and pollutants in the sewage are captured by an adsorption net.
The muddy water mixed liquor automatically flows into the horizontal pipe sedimentation tank 1.5 for muddy water separation, the mixed liquor firstly enters a water flow channel separated out by the partition plate 1.5.3 between the inclined plates 1.5.2, suspended matters enter a lower sedimentation area 1.5.5 through a mud discharge slideway 1.5.4 through short-distance sedimentation, the precipitated sludge is discharged through a sludge discharge port 1.5.6, and the supernatant passes through a third water outlet 1.5.7 discharge system, so that the standard discharge of the landfill leachate is finally realized.
Claims (10)
1. A combination device for post-treatment of salt-containing landfill leachate is characterized by comprising a circulating barrel, an electrochemical reactor, a coagulation tank and a horizontal pipe sedimentation tank which are sequentially connected; the circulating barrel is connected with a first water inlet of the electrochemical reactor through a pipeline and a water pump, and a backflow water outlet at the lower part of the electrochemical reactor is connected with a backflow water inlet in the middle of the circulating barrel through a backflow pipe;
aeration devices are arranged at the bottoms of the electrochemical reactor and the coagulation tank;
the well upper portion of horizontal pipe sedimentation tank is equipped with a plurality of rows of baffles, forms between the adjacent baffle and arranges the mud slide, and one side of baffle evenly sets up a plurality of swash plate.
2. The combination of claim 1, wherein the recycling bin is provided with a second water inlet at the upper part thereof, and the recycling bin is used for storing the garbage leachate after biochemical treatment and the waste liquid returned from the electrochemical reactor.
3. The combination assembly of claim 2, wherein the top of the electrochemical reactor is provided with a first water inlet, the return water outlet is provided on the same side of the electrochemical reactor as the first water inlet, and the middle of the side of the electrochemical reactor opposite to the first water inlet is provided with a first water outlet.
4. The combination of claim 1, wherein the electrochemical reactor has a plurality of anode plates and a plurality of cathode plates disposed therein, the anode plates and the cathode plates being spaced apart from each other,
the anode plate is selected from a BDD anode plate, a Fe film electrode anode plate or an Al film electrode anode plate, and the cathode plate is a stainless steel film electrode cathode plate.
5. The combination of claim 4, wherein the anode plate is electrically connected to an anode plate power interface of a DC power source, the cathode plate is electrically connected to a cathode plate power interface of the DC power source, and the DC power source is external to the electrochemical reactor.
6. The combination of claim 1, further comprising a roots blower, the roots blower being external to the electrochemical reactor;
the bottom of the electrochemical reactor is provided with a first aeration device, the bottom of the coagulation tank is provided with a second aeration device, and the roots blower is connected with the first aeration device and the second aeration device in parallel through an air pipe.
7. The combination of claim 3, further comprising a flocculant storage tank, wherein the upper parts of the two sides of the coagulation tank are respectively provided with a third water inlet and a second water outlet, the top of the coagulation tank is provided with a dosing port, the flocculant storage tank is connected with the dosing port through a metering pump and a dosing pipe, and the first water outlet of the electrochemical reactor is connected with the third water inlet.
8. The combination according to claim 7, wherein the top of the horizontal pipe sedimentation tank is provided with a fourth water inlet, the middle is provided with a third water outlet, and the bottom is provided with a sludge discharge port;
the second water outlet of the coagulation tank is connected with the fourth water inlet through a connecting pipe.
9. The combination of claim 1, wherein the horizontal tube sedimentation tank comprises a separation zone and a sedimentation zone from top to bottom, the separation zone comprises a plurality of rows of inclined partition plates, a plurality of inclined plates are uniformly arranged on one sides of the partition plates facing to the adjacent partition plates, the inclined plates on the same partition plate are parallel to each other and have an inclination angle of 20-30 degrees with the partition plates, and a sludge discharge slideway is formed between the adjacent partition plates.
10. The combination of claim 9, wherein the baffle is angled from 50-70 ° from horizontal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220959827.5U CN216808439U (en) | 2022-04-25 | 2022-04-25 | Combined device for post-treatment of salt-containing landfill leachate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220959827.5U CN216808439U (en) | 2022-04-25 | 2022-04-25 | Combined device for post-treatment of salt-containing landfill leachate |
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