CN109179883B - Pretreatment method and device for aged household garbage leachate - Google Patents
Pretreatment method and device for aged household garbage leachate Download PDFInfo
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- 238000002203 pretreatment Methods 0.000 title claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 238000005189 flocculation Methods 0.000 claims abstract description 30
- 230000016615 flocculation Effects 0.000 claims abstract description 30
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 18
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910001448 ferrous ion Inorganic materials 0.000 claims abstract description 15
- 239000006228 supernatant Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
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- 238000001556 precipitation Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 5
- 238000006396 nitration reaction Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000004277 Ferrous carbonate Substances 0.000 claims description 2
- 229960004652 ferrous carbonate Drugs 0.000 claims description 2
- RAQDACVRFCEPDA-UHFFFAOYSA-L ferrous carbonate Chemical compound [Fe+2].[O-]C([O-])=O RAQDACVRFCEPDA-UHFFFAOYSA-L 0.000 claims description 2
- 235000019268 ferrous carbonate Nutrition 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- 229910000015 iron(II) carbonate Inorganic materials 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 239000000149 chemical water pollutant Substances 0.000 description 18
- 244000005700 microbiome Species 0.000 description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
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- 231100000419 toxicity Toxicity 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- VTEIFHQUZWABDE-UHFFFAOYSA-N 2-(2,5-dimethoxy-4-methylphenyl)-2-methoxyethanamine Chemical compound COC(CN)C1=CC(OC)=C(C)C=C1OC VTEIFHQUZWABDE-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- 238000005341 cation exchange Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 239000012250 organic toxicant Substances 0.000 description 1
- 231100001119 organic toxicant Toxicity 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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- 238000011197 physicochemical method Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- 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
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
A pretreatment method for aged household garbage leachate comprises the following steps: 1) Injecting the aged garbage percolate into an ultraviolet-Fenton reactor, adjusting the pH of the percolate to be acidic, adding ferrous ion solution into the ultraviolet-Fenton reactor, and finally adding hydrogen peroxide into the ultraviolet-Fenton reactor; 2) Regulating ultraviolet band in the ultraviolet-Fenton reactor, then carrying out oxidation reaction under the irradiation of an ultraviolet lamp, and covering an ultraviolet lamp tube on the liquid level of a reaction system; after the oxidation reaction is finished, introducing effluent in the ultraviolet-Fenton reactor into a flocculation sedimentation tank, adjusting pH to be alkaline, and standing for sedimentation; 4) Taking supernatant of a flocculation sedimentation tank to a mineralized garbage biochemical reactor, performing primary filtration by a filter layer A, entering a nitrification reaction layer for nitrification and denitrification reaction, and discharging treated effluent into a filter layer B; the invention also comprises a device applied to the method. The invention can greatly improve the biodegradability of the aged garbage percolate.
Description
Technical Field
The invention relates to the field of landfill leachate treatment, in particular to a pretreatment method and device for aged household landfill leachate.
Background
The landfill leachate is high-concentration and high-pollution organic wastewater generated in the sanitary landfill process of household garbage and industrial garbage, has complex components, high chromaticity and malodor, particularly the landfill time of the aged household garbage leachate (more than 5 years), has lower BOD5/COD value and reduces biodegradability; the concentration of ammonia nitrogen is increased, the C/N ratio is reduced, the nutrition proportion is seriously disregulated, and the effective operation of a percolate biochemical treatment system is seriously influenced.
The pollution control Standard of landfill (GB 16889-2008) issued by the nation provides strict emission standards for the emission quality of landfill leachate, which provides challenges for the treatment of landfill leachate in the aging period, especially denitrification treatment, so that the improvement of the biodegradability of the landfill leachate by a physicochemical method is necessary.
Mineralized refuse refers to refuse in sanitary landfill, after being degraded for several years, is basically in a stabilized state, and shows properties similar to sand in physical properties, but is completely different from sand in structural and chemical characteristics, and particularly has properties such as organic matters, total nitrogen, total phosphorus content, cation exchange capacity and the like which are obviously superior to those of the sand, and has excellent physicochemical properties and strong adsorption performance. The mineralized garbage fine material can be used as a matrix material for pretreatment of the aged household garbage leachate, and can provide excellent adsorption and exchange conditions and excellent microorganism living environment. The conventional landfill leachate treatment process can treat the landfill leachate to reach the discharge standard, but is not suitable for treating the aged landfill leachate, and the landfill leachate is refractory high-concentration organic wastewater with complex components and strong toxicity, has obvious toxic effects on microorganisms, and particularly increases the proportion of refractory organic toxins contained in the aged landfill leachate along with the increase of the age, so that the biodegradability of the leachate is reduced year by year and is extremely difficult to treat. The biochemical index of the leachate generally is according to the ratio of BOD 5/COD in water, the value is lower than 0.2, the biochemical index is difficult to be performed, 0.2-0.3 is difficult to be performed, 0.3-0.45 is performed, the biochemical index is larger than 0.45, the ratio of BOD 5/COD of the common aged garbage leachate is generally smaller than 0.1, the COD value of the aged garbage is reduced after pretreatment, and the biochemical index is improved. Therefore, how to improve the biodegradability of the old garbage leachate has very important significance.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art and provides a pretreatment method and a pretreatment device for aged household garbage leachate, which firstly utilize an ultraviolet-Fenton advanced oxidation technology to carry out oxidation reaction, then balance the water quality of wastewater in a flocculation sedimentation tank, spray the wastewater into a mineralized garbage biochemical treatment device after adjusting the pH value, and can remove most of COD and ammonia nitrogen in the wastewater through biochemical treatment of mineralized garbage, thereby greatly improving the biodegradability of the aged garbage leachate.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a pretreatment method for aged household garbage leachate comprises the following steps:
1) Feeding into an ultraviolet-Fenton reactor: injecting aged garbage percolate into an ultraviolet-Fenton reactor, adjusting the pH of the percolate to be acidic, adding a ferrous ion solution into the ultraviolet-Fenton reactor, wherein the ferrous ion solution is an oxidized reducing agent, and can oxidize organic matters in water into inorganic matters by combining with hydrogen peroxide, and then adding Mn 2+、Cu2+、Co2+ plasma solution to cooperatively react with ultraviolet and ferrous ions to generate more hydroxyl free radicals so as to decompose the organic matters, and meanwhile, ensuring efficient and good cyclic reaction of Fe 3+ and Fe 2+ and accelerate degradation of the organic matters; the volume of the ferrous ion solution is added according to the adding amount of 3.5 to 4.5 per mill of the volume fraction of the percolate, and finally, hydrogen peroxide accounting for 10 to 15 per mill of the volume fraction of the percolate is added into the ultraviolet-Fenton reactor;
2) The oxidation reaction is carried out in an ultraviolet-Fenton reactor: regulating ultraviolet band in the ultraviolet-Fenton reactor, then carrying out oxidation reaction under the irradiation of an ultraviolet lamp, wherein the liquid level of the reaction system covers the ultraviolet lamp tube, ultraviolet generated by the ultraviolet lamp is beneficial to the generation of hydroxyl free radicals in the Fenton reaction, and the oxidation efficiency is improved;
3) Flocculation precipitation: after the oxidation reaction is finished, introducing effluent in the ultraviolet-Fenton reactor into a flocculation sedimentation tank, adjusting pH to be alkaline, and standing for sedimentation;
4) Filtering and performing nitrification and denitrification reaction: taking supernatant of a flocculation sedimentation tank into a mineralized garbage biochemical reactor, wherein the supernatant mainly contains COD, ammonia nitrogen, BOD 5 and other metal ions, the supernatant enters a nitrification reaction layer through preliminary filtration of a filter layer A, nitrifying and denitrifying reaction is carried out to remove refractory organic matters in wastewater, the refractory organic matters mainly contain COD and ammonia nitrogen, the finally treated effluent enters a filter layer B and is discharged outwards, and the finally treated effluent mainly contains ions such as COD, ammonia nitrogen, BOD, calcium and the like, but the concentration of the ions is lower.
As a further improvement of the above technical scheme: the ferrous ion solution in the step 1) is any one of FeSO4.7H2O, ferrous chloride and ferrous carbonate.
Further, the concentration of hydrogen peroxide in the step 1) is 30% of the analytically pure concentration.
And further, the supernatant in the flocculation sedimentation tank in the step 4) is sprayed into the upper structure of the mineralized garbage biochemical reactor through a spraying device.
Further, in the step 1), sulfuric acid is used to adjust the pH to 3.0 to 4.5.
Further, in the step 2), the ultraviolet lamp with the dominant wavelength of 185-254 nm is selected, the effect of selecting the wavelength of 190-230 nm is optimal, the reaction time is 30-60 min, the aeration operation can be performed or not, the aeration operation can increase the full mixing of the medicament and the percolate, the reaction time is shortened, but the effect of the treatment effect is not greatly influenced by the non-aeration operation, and the better full mixing effect can be achieved by properly prolonging the treatment time.
In step 3), naOH solution is used for adjusting the pH value to 8.0-9.0, and the supernatant is taken after standing for 3-4 hours for subsequent treatment.
Further, the retention time of the supernatant in the step 4) in the mineralized garbage biochemical reactor is 12-24 hours, the aeration time is 4-6 hours, the water inlet period is 20-26 hours, and the water inlet time is 4-5 hours.
The pretreatment device for the aged household garbage leachate comprises an ultraviolet-Fenton reactor, a flocculation sedimentation tank, a mineralized garbage biochemical reactor, an aeration device, an ultraviolet generator and an ultraviolet lamp, wherein the ultraviolet-Fenton reactor is a closed container, a reaction cavity is arranged in the ultraviolet-Fenton reactor, a medicament feeding port, a wastewater inlet and a wastewater drain pipe are formed in the upper part of the ultraviolet-Fenton reactor, the ultraviolet generator is arranged outside the ultraviolet-Fenton reactor and connected with the ultraviolet lamp positioned in the reaction cavity, and a pH online detection device is arranged in the reaction cavity; the mineralized garbage biochemical reactor is a closed container, the upper part of the mineralized garbage biochemical reactor is provided with a water inlet pipe and a spraying device, the lower part of the mineralized garbage biochemical reactor is provided with a water outlet, a nitrification reaction layer, a filter layer A and a filter layer B which are positioned at two ends of the nitrification reaction layer are arranged in the mineralized garbage biochemical reactor, and the aeration device is uniformly arranged in the nitrification reaction layer; the flocculation sedimentation tank is arranged between the ultraviolet-Fenton reactor and the mineralized garbage biochemical reactor, and the pH on-line detection device is also arranged in the flocculation sedimentation tank.
As a further improvement of the above technical scheme: the filtration layer A and the filtration layer B are both crushed stone layers, the thickness of the filtration layer A is 8-25cm, the thickness of the filtration layer B is 16-35cm, and the thickness of the nitration reaction layer is 150-350cm.
The invention mainly aims at the aged garbage leachate, the aged garbage leachate is the refractory high-concentration organic wastewater with complex components and strong toxicity, has obvious toxic action on microorganisms, particularly increases the proportion of refractory organic toxicants contained in the aged garbage leachate along with the growth of 'age', leads the biodegradability of the leachate to be reduced year by year, and can effectively decompose refractory organic matters by pretreatment of the aged garbage leachate by an ultraviolet Fenton reactor, thereby reducing the toxicity of the organic matters and obviously improving the biodegradability and the toxic action on microorganisms.
Mineralized garbage is a natural biological system which is gradually formed in a landfill by aerobic, facultative, anaerobic and other responsible environments, has huge microorganism quantity, various types and excellent hydraulic permeability and is multi-phase and porous, and is used as a biological medium degradation material and can degrade difficultly degraded polluted organic matters. Recharging is used as a means for treating the leachate in a landfill, and long-term recharging is beneficial to mineralizing the landfill to screen out efficient dominant microorganism flora for degrading the leachate, so that efficient leachate treatment capacity is formed. Meanwhile, the mineralized garbage is excellent in adsorption performance due to the multi-phase porous structural characteristics, and the leachate can be well deeply treated. The technology adopts the mineralized garbage biochemical reactor, the mineralized garbage filling layer of the mineralized garbage biochemical reactor has dominant bacteria group which is easy to degrade aged garbage percolate, and the mineralized garbage filling layer is used as an adsorption material with low cost to carry out advanced treatment on the aged garbage percolate, so that the purpose of high-efficiency and low-cost treatment of the wastewater is realized.
The biochemical property of the aged landfill leachate can be improved by adopting ultraviolet-Fenton reaction and flocculation precipitation to carry out pretreatment, and experiments on certain aged landfill leachate in Hunan find that the BOD 5/COD of the aged landfill leachate before pretreatment is 0.05, and the BOD 5/COD is 0.38 after pretreatment, so that the biochemical property of the aged landfill leachate can be obviously improved. The biochemical improvement of the percolate is beneficial to the treatment of the mineralized garbage biochemical reactor, and the percolate can reach the discharge standard after the treatment of the mineralized garbage biochemical reactor.
The ultraviolet-Fenton reaction, flocculation precipitation and mineralized garbage biochemical reactor are in close connection, the synergistic effect can be realized, the biodegradability of the aged household garbage percolate can be improved through the ultraviolet-Fenton reaction and the flocculation precipitation, the subsequent nitrification and denitrification reaction carried out in the mineralized garbage biochemical reactor can thoroughly remove harmful components in the filtrate, the water quality coming out of the mineralized garbage biochemical reactor is ensured to reach the standard, other water treatment processes are not needed, and compared with the existing treatment by adding additives or using membranes, the invention can well achieve the purification treatment of the aged household garbage percolate through three devices (the ultraviolet-Fenton reactor, the flocculation precipitation tank and the mineralized garbage biochemical reactor), has the advantages of simple method, less used equipment and low cost expenditure, and the water quality obtained after the treatment reaches the standard greatly.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, ultraviolet-Fenton reaction and flocculation precipitation pretreatment are adopted, 70% -80% of COD in the percolate can be removed by degrading refractory organic matters in the percolate, the numerical value of BOD 5/COD is improved, the biodegradability of the percolate is improved, and the BOD 5/COD of the aged landfill leachate before pretreatment is found to be 0.05 through a test of the aged landfill leachate in Hunan, and the BOD 5/COD is found to be 0.38 after pretreatment, so that the biodegradability of the aged landfill leachate is remarkably improved; the mineralized garbage is used for further treatment, so that the pollution and damage of the garbage percolate to the environment are reduced, the treatment efficiency is high, no secondary pollution is generated, the improvement of the resident living environment quality is facilitated, the method is particularly used for the aged household garbage percolate, and can also be used for other household garbage percolate and industrial garbage percolate, and when the method is used for other household garbage percolate and industrial garbage percolate, the method is fully quantitative treatment for the existing treatment, the treatment process flow is simple, the treatment process is easy to control, the treatment cost is low, concentrated liquid cannot be generated, and the like;
2. According to the technical scheme, the Fenton oxidation reaction is innovatively enhanced by adopting the ultraviolet lamp, and the adopted ultraviolet light is catalyzed, so that continuous conversion of Fe 3+ and Fe 2+ is facilitated, the utilization efficiency of H 2O2 and ferrous ions is improved, the use efficiency of H 2O2 can be improved by ultraviolet light, the use amount of the H 2O2 is reduced, the utilization efficiency of ferrous ions can be improved, the use amount of ferrous ions is reduced, resources are saved, and the treatment cost is reduced by realizing the interconversion cycle of Fe 3+ and Fe 2+;
3. the method has the advantages that the first oxidation and the later precipitation are one of the key steps of Fenton reaction effect, the organic matters which are difficult to degrade in the percolate are oxidized by utilizing the strong oxidant hydroxyl free radicals generated by Fenton, the later precipitation can adjust the pH value in the wastewater, remove redundant hydrogen peroxide and other ions (mainly COD) which are unfavorable for biochemical reaction in the water, adjust the water quality, and are beneficial to subsequent biochemistry and ensure that the water quality reaches the standard;
4. the technology of the invention uses the ultraviolet Fenton oxidation reactor and a subsequent reaction device to treat the aged domestic garbage percolate, can improve the biodegradability of the percolate, can reduce the dosage of medicament (adding ultraviolet light, improving the use efficiency of medicament) compared with the conventional Fenton oxidation reactor, improves the oxidation efficiency and obviously reduces the treatment cost;
5. The technology adopts a mineralized garbage biochemical reactor, utilizes microorganism strains (mainly nitrifying bacteria and denitrifying bacteria suitable for the water quality of the leachate) contained in the mineralized garbage, domesticates special dominant strains in the mineralized garbage (the domestication process mainly refers to biochemical culture and dominant bacterial groups), has good degradation effect on pollutants such as COD, ammonia nitrogen and the like in the leachate of the garbage, is easy to obtain mineralized garbage raw materials, is easy to recycle, has less investment in capital construction, and improves the treatment efficiency of the leachate.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Legend description:
1. An ultraviolet-Fenton reactor; 11. a reaction chamber; 12. a medicament delivery port; 13. a wastewater inlet; 14. a waste water drain pipe; 2. a flocculation sedimentation tank; 3. mineralized garbage biochemical reactor; 31. a water inlet pipe; 32. a water outlet; 33. a nitration reaction layer; 34. a filter layer A; 35. a filter layer B; 4. an aeration device; 5. an ultraviolet generator; 6. an ultraviolet lamp; 7. a pH on-line detection device; 8. and a spraying device.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown, for the purpose of illustrating the invention, but the scope of the invention is not limited to the specific embodiments shown.
As shown in fig. 1, a pretreatment method for aged household garbage leachate comprises the following steps:
1) To uv-fenton reactor 1 was charged: injecting aged garbage percolate into an ultraviolet-Fenton reactor 1, adjusting the pH of the percolate to be acidic, adding ferrous ion solution into the ultraviolet-Fenton reactor 1, adding the volume of the ferrous ion solution according to the adding amount of 3.5-4.5 per mill of the volume fraction of the percolate, and finally adding hydrogen peroxide accounting for 10-15 per mill of the volume fraction of the percolate into the ultraviolet-Fenton reactor 1;
2) The oxidation reaction is carried out in the ultraviolet-Fenton reactor 1: regulating the ultraviolet band in the ultraviolet-Fenton reactor 1, and then carrying out oxidation reaction under the irradiation of an ultraviolet lamp 6, wherein the liquid level of the reaction system covers an ultraviolet lamp tube;
3) Flocculation precipitation: after the oxidation reaction is finished, introducing the effluent in the ultraviolet-Fenton reactor 1 into a flocculation sedimentation tank 2, adjusting the pH to be alkaline, and standing for sedimentation;
4) Filtering and performing nitrification and denitrification reaction: taking supernatant of the flocculation sedimentation tank 2 to the mineralized garbage biochemical reactor 3, performing preliminary filtration through a filter layer A34, entering a nitrification reaction layer 33, performing nitrification and denitrification reaction to remove refractory organic matters in the wastewater, and finally discharging the treated effluent into a filter layer B35.
In this embodiment, the ferrous ion solution in step 1) is FeSO 4·7H2 O.
In this example, the concentration of hydrogen peroxide in step 1) is 30% analytically pure.
In the embodiment, the supernatant in the flocculation sedimentation tank 2 in the step 4) is sprayed into the upper layer structure of the mineralized garbage biochemical reactor 3 through a spraying device.
In this example, sulfuric acid was used to adjust the pH to 3.0 to 4.5 in step 1).
In this embodiment, the ultraviolet light 6 with a dominant wavelength of 185-254 nm is selected in the step 2), and the reaction time is 40min.
In this example, in step 3), the pH was adjusted to 8.5 using NaOH solution, and the supernatant was collected after standing for 3.5 hours for subsequent treatment.
In the embodiment, the retention time of the supernatant in the step 4) in the mineralized garbage biochemical reactor 3 is 18 hours, the aeration time is 5 hours, the water inlet period is 24 hours, and the water inlet time is 4.5 hours.
The pretreatment device for the aged household garbage leachate comprises an ultraviolet-Fenton reactor 1, a flocculation sedimentation tank 2, a mineralized garbage biochemical reactor 3, an aeration device 4, an ultraviolet generator 5 and an ultraviolet lamp 6, wherein the ultraviolet-Fenton reactor 1 is a closed container, a reaction cavity 11 is arranged in the ultraviolet-Fenton reactor 1, a medicament feeding port 12, a wastewater inlet 13 and a wastewater drain pipe 14 are formed in the upper part of the ultraviolet-Fenton reactor 1, the ultraviolet generator 5 is arranged outside the ultraviolet-Fenton reactor 1 and connected with the ultraviolet lamp 6 positioned in the reaction cavity 11, and a pH online detection device 7 is arranged in the reaction cavity 11; the mineralized garbage biochemical reactor 3 is a closed container, the upper part is provided with a water inlet pipe 31 and a spraying device 8, the lower part is provided with a water outlet 32, a nitrification reaction layer 33, a filter layer A34 and a filter layer B35 which are positioned at two ends of the nitrification reaction layer 33 are arranged in the mineralized garbage biochemical reactor 3, and the aeration device 4 is uniformly arranged in the nitrification reaction layer 33; the flocculation sedimentation tank 2 is arranged between the ultraviolet-Fenton reactor 1 and the mineralized garbage biochemical reactor 3, and the flocculation sedimentation tank 2 is also internally provided with a pH on-line detection device 7.
In this embodiment, the filter layer A34 and the filter layer B35 are both crushed stone layers, the thickness of the filter layer A34 is 10cm, the thickness of the filter layer B35 is 20cm, and the thickness of the nitration reaction layer 33 is 200cm.
Claims (4)
1. A pretreatment method for aged household garbage leachate is characterized by comprising the following steps:
1) Feeding to an ultraviolet-Fenton reactor (1): injecting aged garbage percolate into an ultraviolet-Fenton reactor (1), adjusting the pH of the percolate to be acidic, adding ferrous ion solution into the ultraviolet-Fenton reactor (1), adding the volume of the ferrous ion solution according to the adding amount of 3.5-4.5 per mill of the volume fraction of the percolate, and finally adding hydrogen peroxide accounting for 10-15 per mill of the volume fraction of the percolate into the ultraviolet-Fenton reactor (1);
2) The oxidation reaction is carried out in an ultraviolet-Fenton reactor (1): regulating the ultraviolet band in the ultraviolet-Fenton reactor (1), and then carrying out oxidation reaction under the irradiation of an ultraviolet lamp (6), wherein the liquid level of the reaction system covers the ultraviolet lamp tube;
3) Flocculation precipitation: after the oxidation reaction is finished, introducing effluent in the ultraviolet-Fenton reactor (1) into a flocculation sedimentation tank (2), regulating pH to be alkaline, and standing for sedimentation;
4) Filtering and performing nitrification and denitrification reaction: taking supernatant of the flocculation sedimentation tank (2) to a mineralized garbage biochemical reactor (3), performing preliminary filtration by a filter layer A (34) to enter a nitrification reaction layer (33), performing nitrification and denitrification reaction to remove refractory organic matters in wastewater, and finally discharging treated effluent to the outside by a filter layer B (35);
in the step 1), sulfuric acid is used for regulating the pH value to 3.0-4.5;
The step 2) selects an ultraviolet lamp (6) with the dominant wavelength of 185-254 nm as the ultraviolet wave band, and the reaction time is 30-60 min;
In the step 3), naOH solution is used for regulating the pH value to 8.0-9.0, and supernatant fluid is taken for subsequent treatment after standing for 3-4 hours;
The retention time of the supernatant in the step 4) in the mineralized garbage biochemical reactor (3) is 12-24 hours, the aeration time is 4-6 hours, the water inlet period is 20-26 hours, and the water inlet time is 4-5 hours;
The filter layer A (34) and the filter layer B (35) are both crushed stone layers, the thickness of the filter layer A (34) is 8-25cm, the thickness of the filter layer B (35) is 16-35cm, and the thickness of the nitration reaction layer (33) is 150-350cm;
The device applied to the pretreatment method for the aged household garbage leachate comprises an ultraviolet-Fenton reactor (1), a flocculation sedimentation tank (2), a mineralized garbage biochemical reactor (3), an aeration device (4), an ultraviolet generator (5) and an ultraviolet lamp (6), wherein the ultraviolet-Fenton reactor (1) is a closed container, a reaction cavity (11) is arranged in the ultraviolet-Fenton reactor, a medicament delivery port (12), a wastewater inlet (13) and a wastewater drain pipe (14) are formed in the upper part of the ultraviolet-Fenton reactor (1), the ultraviolet generator (5) is arranged outside the ultraviolet-Fenton reactor (1) and connected with the ultraviolet lamp (6) positioned in the reaction cavity (11), and a pH online detection device (7) is arranged in the reaction cavity (11); the mineralized garbage biochemical reactor (3) is a closed container, the upper part of the mineralized garbage biochemical reactor is provided with a water inlet pipe (31) and a spraying device (8), the lower part of the mineralized garbage biochemical reactor is provided with a water outlet (32), a nitrification reaction layer (33), a filter layer A (34) and a filter layer B (35) which are positioned at two ends of the nitrification reaction layer (33) are arranged in the mineralized garbage biochemical reactor (3), and the aeration device (4) is uniformly arranged in the nitrification reaction layer (33); the flocculation sedimentation tank (2) is arranged between the ultraviolet-Fenton reactor (1) and the mineralized garbage biochemical reactor (3), and the pH on-line detection device (7) is also arranged in the flocculation sedimentation tank (2).
2. The pretreatment method for the aged household garbage leachate according to claim 1, wherein the ferrous ion solution in the step 1) is any one of FeSO 4▪7H2 O, ferrous chloride and ferrous carbonate.
3. The pretreatment method for the aged household garbage leachate according to claim 1, wherein the concentration of hydrogen peroxide in the step 1) is 25-35% of analytically pure concentration.
4. The pretreatment method for aged household garbage leachate according to claim 1, wherein the supernatant in the flocculation sedimentation tank (2) in the step 4) is sprayed into the upper structure of the mineralized garbage biochemical reactor (3) through a spraying device.
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| CN110918096B (en) * | 2019-12-17 | 2022-12-27 | 南京神克隆科技有限公司 | Heterogeneous Fenton catalyst, application and wastewater treatment method |
| CN111138040A (en) * | 2020-01-19 | 2020-05-12 | 北京首钢生物质能源科技有限公司 | Landfill leachate treatment method |
| CN111410339A (en) * | 2020-04-15 | 2020-07-14 | 华中师范大学 | Method for pretreating kitchen waste leachate based on molecular oxygen activation and enhanced flocculation |
| CN112067498B (en) * | 2020-07-25 | 2024-02-13 | 东北电力大学 | In-water discharge H 2 O 2 Particle space-time density distribution measuring device and measuring method thereof |
| CN114634265A (en) * | 2022-03-16 | 2022-06-17 | 北京安力斯环境科技股份有限公司 | photo-Fenton process for treating refractory organic wastewater |
| CN117819773A (en) * | 2024-01-30 | 2024-04-05 | 广东鼎丰纸业有限公司 | Efficient environment-friendly pulping waste Shui Guangfen ton treatment method, reaction device and application |
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