CN218454069U - Harmless treatment system for high ammonia nitrogen landfill leachate - Google Patents
Harmless treatment system for high ammonia nitrogen landfill leachate Download PDFInfo
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- CN218454069U CN218454069U CN202221792195.4U CN202221792195U CN218454069U CN 218454069 U CN218454069 U CN 218454069U CN 202221792195 U CN202221792195 U CN 202221792195U CN 218454069 U CN218454069 U CN 218454069U
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Abstract
The utility model discloses a harmless treatment system of high ammonia nitrogen landfill leachate, which comprises a pretreatment device, an deamination device, a coagulation treatment device, a central sedimentation tank, a three-dimensional electro-catalysis device, a biochemical treatment device, a biochemical sedimentation tank and a clean water tank which are connected in sequence; the pretreatment device, the coagulation treatment device, the three-dimensional electro-catalysis device and the biochemical sedimentation tank are all provided with sludge discharge ports, and the sludge discharge ports are connected with a sludge tank; the pretreatment device and the coagulation treatment device are both provided with a dosing port; the deamination device is provided with a gas collection unit. The utility model discloses a preliminary treatment, deamination are handled, are thoughtlessly congealed and electrocatalysis is handled for biochemical treatment provides stable quality of water, ensures that biochemical play water is discharge to reach standard, does not increase any membrane treatment process, reduces secondary pollutant.
Description
Technical Field
The utility model relates to a sewage treatment system especially relates to a innocent treatment system of high ammonia nitrogen landfill leachate.
Background
The economy and population of China develop rapidly, and the harmless treatment of the municipal domestic waste is an important link for the green development of cities in China. The current garbage disposal modes are landfill, composting and incineration, garbage leachate is high-concentration organic sewage generated in the garbage accumulation, transportation and disposal processes, and the generation amount of the garbage leachate is related to factors such as the geographical position, the regional hydrology, the climate and the like of the garbage disposal, and is also related to factors such as the garbage property, the water content of the garbage, the landfill mode, the time and the like. According to statistics, about 0.2t of landfill leachate is generated by 1t of municipal refuse on average, the components are complex, the types of pollutants are multiple, nitrogen-containing substances are converted into ammonia nitrogen and become the main existence form of nitrogen in the landfill leachate, the proportion is 85% -90%, and high ammonia nitrogen has a serious inhibition effect on biochemistry. The landfill leachate has the characteristics of high organic matter concentration, high ammonia nitrogen, high heavy metal content, high chroma, strong odor and the like. If not properly treated, can cause serious pollution to surrounding water and soil.
Along with the extension of landfill time, the leachate has the characteristics of high hardness, high salt content, high heavy metal content, high organic pollutant concentration, high ammonia nitrogen and total nitrogen content, poor biodegradability and the like, and the problems of membrane concentrated solution and total nitrogen not reaching the standard are solved by adopting the processes of physicochemical treatment, biochemical treatment, membrane treatment, high-efficiency anaerobic treatment, ammonia stripping treatment, biochemical treatment, membrane treatment and the like.
For example, chinese patent publication No. CN106219884B discloses a method for treating high ammonia nitrogen landfill leachate, which traps particulate matters and suspended matters in the landfill leachate through sand filtration and impurity removal treatment, reduces the total hardness and alkalinity of the leachate through electrolytic scale removal treatment, avoids scaling in subsequent process stages, reduces suspended matters and turbidity of softened leachate through multi-media filtration treatment, separates inorganic salts from organic matters through electrodialysis treatment, transfers ammonia nitrogen to the concentrated water side for recovery, enters low ammonia nitrogen fresh water produced by electrodialysis and degassing membrane drainage into membrane biochemical reaction treatment, and ensures discharge membrane biological reaction treatment up to the standard by using nanofiltration process.
Therefore, the process for thoroughly and harmlessly treating the landfill leachate becomes more important, the complete harmless treatment of the landfill leachate can clean the water quality and reduce the environmental pollution, and the problems in the traditional process are solved. The research and development of a low-cost and secondary pollutant-free garbage leachate thorough harmless treatment technology is advocated by the government and is the work center of gravity of the current environmental protection industry.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high ammonia nitrogen landfill leachate's innocent treatment system can realize the purpose with the thorough innocent treatment of high ammonia nitrogen landfill leachate.
The utility model provides a following technical scheme:
a harmless treatment system for high ammonia nitrogen landfill leachate comprises a pretreatment device, a deamination device, a coagulation treatment device, a central sedimentation tank, a three-dimensional electro-catalysis device, a biochemical treatment device, a biochemical sedimentation tank and a clean water tank which are connected in sequence;
the pretreatment device, the coagulation treatment device, the three-dimensional electro-catalysis device and the biochemical sedimentation tank are all provided with sludge discharge ports, and the sludge discharge ports are connected with a sludge tank;
the pretreatment device and the coagulation treatment device are both provided with a dosing port;
the deamination device is provided with a gas collection unit.
The pH value of the landfill leachate is adjusted to 9.0-14.0 by adding the chelating alkali through a dosing port of the pretreatment device, and simultaneously, the descaling agent is added. The chelating alkali is at least one of caustic soda flakes, nano alkali, hydrated lime, quicklime, carbide slag, a dispersing agent and a high molecular polymer.
The pretreatment of the pretreatment device can reduce the alkalinity and hardness of the landfill leachate and reduce the blockage of tower plates and aeration pipes in the deamination device.
Preferably, the deamination device is a steam stripping deamination device.
The deamination device converts high ammonia nitrogen in the percolate into free ammonia gas by using a steam stripping method, discharges the free ammonia gas, collects the free ammonia gas by using a gas collection unit, and then introduces dilute sulfuric acid to react to produce ammonium sulfate.
Inorganic acid, inorganic chelating agent and coagulant are added through a dosing port of the coagulation treatment device, the pH value of the deamination sewage is adjusted to 1.5-8.5, and flocculation is carried out under the action of the inorganic chelating agent and the coagulant. The inorganic acid is at least one of concentrated sulfuric acid, concentrated hydrochloric acid, phosphoric acid, peroxy acid, pyrosulfuric acid and pyrosulfurous acid. The inorganic chelating agent is at least one of ferric sulfate, ferrous sulfate, polymeric ferric sulfate, polymeric aluminum ferric sulfate, aluminum sulfate, polymeric aluminum chloride, manganese oxide, ferric chloride and magnesium sulfate. The coagulant is at least one of cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide and amphoteric polyacrylamide.
An air floatation machine and an ultrasonic machine are arranged in the central sedimentation tank; the air flotation machine is arranged below the central sediment, and the gas inlet is designed on the side surface of the bottom of the air flotation tank; the ultrasonic machine is designed above the middle of the side surface of the sedimentation tank. The air floatation machine removes suspended matters and a small amount of grease in the wastewater, and the ultrasonic machine improves the precipitation effect of the sedimentation tank to form rapid precipitation. The inclined tube layout area of the central sedimentation tank is 2-4 times of the conventional area, and occupies 80 percent of the whole central sedimentation.
The three-dimensional electrocatalysis device comprises an anode plate, a cathode plate and a particle electrode.
The base material of the anode plate is titanium, and a micron or submicron metal oxide film is deposited on the surface of the base material.
The metal oxide is SnO 2 、IrO 2 、RuO 2 、PbO 2 At least one of (1).
The cathode plate is made of 304 stainless steel, pure titanium steel, carbon steel and graphene.
The particle electrode is loaded with at least one of iron, manganese, zinc, cerium, cesium, tin, platinum and titanium.
The biochemical treatment device is one or more of AO, A2O, AO2, A2O3, AO3 and AO4 systems. The biochemical treatment device ensures that CODcr, ammonia nitrogen, total nitrogen and total phosphorus of the effluent of the system all reach the discharge standard.
Preferably, the filler of the biochemical treatment device comprises at least one of ceramsite, activated carbon, polystyrene, polypropylene PE and plastic, and the microorganism of the biochemical treatment device is halotolerant bacteria, nitrobacteria or denitrifying bacteria.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an innocent treatment system's advantage lies in solving the membrane concentrate problem that exists among the prior art, total nitrogen problem not up to standard. The utility model reduces the alkalinity and hardness of the leachate through the pretreatment device, and reduces the blockage of the tower plate and the aeration pipe in the deamination device; the deamination wastewater is treated by the coagulation treatment device, so that organic pollutants in the deamination wastewater can be efficiently removed, and stable water quality is provided for the three-dimensional electro-catalysis device; the method decomposes or converts the macromolecular organic pollutants difficult to be biochemically generated into biochemical micromolecules or inorganic matters in a specific three-dimensional electro-catalytic device, and has short retention time and low energy consumption. The utility model discloses a preliminary treatment, deamination are handled, are thoughtlessly congealed and electrocatalysis is handled for biochemical treatment provides stable quality of water, ensures that biochemical play water is discharge to reach standard, does not increase any membrane treatment process, reduces secondary pollutant.
Drawings
FIG. 1 is a schematic view showing the structure and the processing flow of the innocent treatment system of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the present invention will be described in detail with reference to the preferred embodiments and the accompanying drawings.
As shown in fig. 1, a harmless treatment system for high ammonia nitrogen landfill leachate comprises a pretreatment device, a deamination device, a coagulation treatment device, a central sedimentation tank, a three-dimensional electro-catalysis device, a biochemical treatment device, a biochemical sedimentation tank and a clean water tank which are connected in sequence; the pretreatment device, the coagulation treatment device, the three-dimensional electro-catalysis device and the biochemical sedimentation tank are all provided with sludge discharge ports, and the sludge discharge ports are connected with a sludge tank; the pretreatment device and the coagulation treatment device are both provided with a dosing port; the deamination device is provided with a gas collection unit.
Chelating alkali including caustic soda flakes, nano-alkali, slaked lime, quicklime, a dispersing agent, a high molecular polymer and the like can be added through a dosing port of the pretreatment device, the pH value of the landfill leachate is adjusted to 9.0-14.0, a scale remover is added at the same time, the stirring time is specifically 10-240min, and a high-grade circulating pump is used for pumping the regulating solution into the deamination device.
The deamination device is a steam stripping deamination device, high ammonia nitrogen in the percolate is converted into free ammonia gas by using a steam stripping method and is discharged, then the free ammonia gas is collected by a gas collection unit, and then the free ammonia gas can be introduced into dilute sulfuric acid to react to produce ammonium sulfate.
Inorganic acid, inorganic chelating agent and coagulant can be added through a dosing port of the coagulation treatment device, the pH of the sewage is adjusted to 1.5-8.5, the sewage reacts under the inorganic chelating agent, and then flocculation is carried out under the action of a flocculating agent. The coagulant comprises one or more of ferric sulfate, ferrous sulfate, polymeric ferric sulfate, polymeric aluminum ferric sulfate, aluminum sulfate, polymeric aluminum chloride, manganese oxide, ferric trichloride, magnesium sulfate, polymethylene amide and the like.
Three-dimensionalThe electrocatalysis device is characterized in that the anode plate is made of pure titanium plate, and a layer of micron or submicron metal oxide film (SnO) can be deposited on the surface of the titanium anode plate after processing 2 、IrO 2 、 RuO 2 、PbO 2 And the like); the cathode is made of one or more of 304 stainless steel, pure titanium steel, carbon steel, graphene and the like; the particle electrode loading substance comprises one or more of heavy metals such as iron, manganese, zinc, cerium, cesium, tin, platinum, titanium and the like.
The filler of the biochemical treatment device comprises at least one of ceramsite, activated carbon, polystyrene, polypropylene PE and plastics, and the microorganisms of the biochemical treatment device are halotolerant bacteria, nitrobacteria or denitrifying bacteria and the like so as to improve the denitrification efficiency.
Adopt the utility model discloses an embodiment that innocent treatment system handled high ammonia nitrogen landfill leachate is as follows:
example 1
The full-quantization treatment process of the landfill leachate specifically comprises the following steps:
pre-treatment of deamination, specifically, adding medicament into an adjusting tank to adjust the pH value of the landfill leachate to 9.0-12.0, stirring for 30-180min at a stirring speed of 600-3500 rpm for 30-120min;
deamination treatment, namely determining the gas-water ratio, the temperature and the deamination time, wherein the gas-water ratio is 3000, the temperature is 25-35 ℃, and the deamination time is about 6 hours;
the high-efficiency coagulation treatment specifically comprises the step of adding a special coagulant to coagulate the leachate after ammonia distillation treatment, wherein various forms of organic matters exist in the leachate, and the coagulation is carried out according to the ratio of CODcr: adding medicaments in a ratio of medicament = 1; stirring for 20-120min by mechanical stirring, and adding polyacrylamide for flocculation and precipitation for 30-120min after stirring;
three-dimensional electrocatalysis treatment, which is specifically operated to decompose the organic matters which are difficult to degrade into inorganic matters such as CO by three-dimensional electrocatalysis reaction of the organic matters which are not degradable after coagulation 2 And H 2 O, and the like, thereby realizing advanced treatment, wherein the pretreated water sample has the water inlet speed of 50L/h and the retention time of 20min;
and (3) biochemical denitrification treatment, namely performing nitrification and denitrification treatment on the water sample subjected to advanced treatment, removing nitrate nitrogen converted in water quality, reducing the total nitrogen in the wastewater to be below the requirement, and realizing zero discharge of the water quality.
Example 2
The method of landfill leachate adopted in this embodiment is the same as that of embodiment 1, and the difference is that the landfill leachate in this embodiment is new landfill leachate, the salt content in the leachate is lower than that in embodiment 1, the concentration of organic matters is the same as that in embodiment 1, the amount of added chelating alkali in the process of adjusting the pH is less than that in embodiment 1, the amount of added chemicals in the coagulation tank is less, and the color and taste of the leachate are effectively removed after advanced treatment.
Example 3
The landfill leachate method adopted in this example is the same as that of example 1, the reaction time in the advanced treatment process is 25min, and other treatment steps are the same as those of example 1.
Index testing
The landfill leachate (stock solution) of the treatment process of each embodiment 1 to 3 and the water quality of each process section are respectively taken for content determination of COD and nitrogen-containing pollutants. The results are shown in tables 1 to 3.
Table 1 example 1 measurement results of COD and nitrogen-containing pollutant content
Table 2 example 2 measurement results of COD and nitrogen-containing pollutant content
Table 3 example 3 measurement results of COD and nitrogen-containing pollutant content
As can be seen from tables 1-3, the final drainage of the landfill leachate full-quantification treatment process in the embodiments 1-3 of the present invention has reached the standard, the removal rate of COD and nitrogen-containing pollutants reaches more than 99%, and the content is far lower than the corresponding discharge standard, wherein, embodiment 2 is the best embodiment.
The tests show that the total harmless treatment process for the landfill leachate can obviously remove pollutants in the landfill leachate, has extremely high removal rate so as to achieve the aim of water purification, and has total harmless treatment and ultralow energy consumption.
The above description is only exemplary of the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the present invention.
Claims (9)
1. A harmless treatment system of high ammonia nitrogen landfill leachate is characterized by comprising a pretreatment device, a deamination device, a coagulation treatment device, a central sedimentation tank, a three-dimensional electro-catalysis device, a biochemical treatment device, a biochemical sedimentation tank and a clean water tank which are connected in sequence;
the pretreatment device, the coagulation treatment device, the three-dimensional electro-catalysis device and the biochemical sedimentation tank are all provided with sludge discharge ports, and the sludge discharge ports are connected with a sludge tank;
the pretreatment device and the coagulation treatment device are both provided with a dosing port;
the deamination device is provided with a gas collection unit.
2. The harmless treatment system for high ammonia nitrogen landfill leachate according to claim 1, wherein the deamination device is a steam stripping deamination device.
3. The harmless treatment system for high ammonia nitrogen landfill leachate according to claim 1, wherein the three-dimensional electro-catalysis device comprises an anode plate, a cathode plate and a particle electrode.
4. The harmless treatment system of high ammonia nitrogen landfill leachate according to claim 3, wherein the substrate of the anode plate is titanium, and a micron or submicron metal oxide film is deposited on the surface of the substrate.
5. The harmless treatment system for high ammonia nitrogen landfill leachate according to claim 4, wherein the metal oxide is SnO 2 、IrO 2 、RuO 2 、PbO 2 To (3) is provided.
6. The harmless treatment system for high ammonia nitrogen landfill leachate according to claim 3, wherein the cathode plate is made of 304 stainless steel, pure titanium steel, carbon steel or graphene.
7. The harmless treatment system of high ammonia nitrogen landfill leachate according to claim 3, wherein the particle electrode is loaded with one of iron, manganese, zinc, cerium, cesium, tin, platinum and titanium.
8. The innocent treatment system of high ammonia nitrogen landfill leachate according to claim 1, wherein the biochemical treatment device is one of AO, A2O, AO2, A2O3, AO4 system.
9. The harmless treatment system of high ammonia nitrogen landfill leachate according to claim 1, wherein the filler of the biochemical treatment device comprises one of ceramsite, activated carbon, polystyrene, polypropylene PE and plastic, and the microorganism of the biochemical treatment device is halotolerant bacteria, nitrobacteria or denitrifying bacteria.
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