CN114477422A - System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation - Google Patents
System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation Download PDFInfo
- Publication number
- CN114477422A CN114477422A CN202210192080.XA CN202210192080A CN114477422A CN 114477422 A CN114477422 A CN 114477422A CN 202210192080 A CN202210192080 A CN 202210192080A CN 114477422 A CN114477422 A CN 114477422A
- Authority
- CN
- China
- Prior art keywords
- tank
- fermentation
- sewage
- low
- ratio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 73
- 238000000855 fermentation Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000004151 fermentation Effects 0.000 title claims abstract description 45
- 230000000694 effects Effects 0.000 title claims abstract description 39
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004062 sedimentation Methods 0.000 claims abstract description 22
- 238000005273 aeration Methods 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims description 26
- 239000003818 cinder Substances 0.000 claims description 19
- 239000003245 coal Substances 0.000 claims description 19
- 238000010992 reflux Methods 0.000 claims description 18
- 239000002068 microbial inoculum Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 15
- 238000010564 aerobic fermentation Methods 0.000 claims description 14
- 241000233866 Fungi Species 0.000 claims description 12
- 241000223261 Trichoderma viride Species 0.000 claims description 11
- 241000193744 Bacillus amyloliquefaciens Species 0.000 claims description 10
- 244000063299 Bacillus subtilis Species 0.000 claims description 10
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000002910 solid waste Substances 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 7
- 239000010813 municipal solid waste Substances 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000010902 straw Substances 0.000 claims description 5
- 239000002154 agricultural waste Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 4
- 241000609240 Ambelania acida Species 0.000 claims description 2
- 241000194107 Bacillus megaterium Species 0.000 claims description 2
- 239000010905 bagasse Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 17
- 239000000126 substance Substances 0.000 abstract description 13
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000004021 humic acid Substances 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 40
- 229910052757 nitrogen Inorganic materials 0.000 description 20
- 235000014113 dietary fatty acids Nutrition 0.000 description 9
- 229930195729 fatty acid Natural products 0.000 description 9
- 239000000194 fatty acid Substances 0.000 description 9
- 150000004665 fatty acids Chemical class 0.000 description 9
- 206010021143 Hypoxia Diseases 0.000 description 8
- 241000894006 Bacteria Species 0.000 description 7
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000010806 kitchen waste Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000002053 acidogenic effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006790 cellular biosynthetic process Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- -1 landfill leakage Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
-
- 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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Abstract
The invention discloses a system and a process for enhancing the denitrification effect of sewage with low C/N ratio by fermentation. Wherein: the anaerobic tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank are sequentially connected. The bioreactor comprises a tank body, and an aeration device and a stirrer which are arranged in the tank body, wherein a water inlet pipe of the tank body is connected with a mixed liquid return pipe between the aerobic tank and the secondary sedimentation tank, and a water outlet pipe of the tank body is communicated with the anoxic tank. The tank body is also provided with a feed inlet, an air inlet pipe and an exhaust pipe. According to the invention, the bioreactor is arranged on the mixed liquid backflow path, and the humic acid generated in the anaerobic fermentation process is used as the promoting substance of the electronic shuttle body, so that the denitrification process of sewage treatment can be effectively promoted, the denitrification effect of sewage with low C/N ratio is effectively enhanced, and the problem of poor denitrification effect of sewage under the conditions of low temperature and low carbon is solved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a system and a process for enhancing the denitrification effect of sewage with low C/N ratio by fermentation.
Background
The following in the background art merely refers to information that is understood by the inventor to be relevant to the present invention and is intended to augment understanding of the present invention through a description of some basic technical knowledge related to the present invention, which information does not necessarily have to constitute knowledge that is well known by those of ordinary skill in the art.
With the coming of the industrial age, the urbanization process of each country is continuously accelerated, the industrial intensification degree is greatly improved, and a large amount of agricultural fertilizer is used. The natural environment is seriously damaged, the normal circulation process of nitrogen elements in the environment is disturbed, and the water environment is seriously polluted finally. This makes nitrogen pollution one of the most important factors for environmental pollution today. The nitrogen pollution in various water bodies mainly comes from: sewage treatment and discharge, aquaculture wastewater, industrial wastewater, landfill leakage, chemical fertilizer abuse and the like.
At present, the eutrophication condition of the water body in China is increasingly serious due to nitrogen pollution caused by domestic sewage, industrial wastewater and agricultural non-point source pollution, and the water environment problem caused by the eutrophication condition brings great harm to the normal production and life of people. In addition, excessive nitrogen in the water body also produces great harm to human bodies, especially ammonia nitrogen and nitrite, and seriously threatens the life safety of people. Therefore, the efficient denitrification of sewage is the major factor in sewage treatment under eyes.
The water treatment process in China is relatively mature, and a certain effect is generated in the aspect of sewage treatment, but the sewage treatment process in China is limited by factors such as regional environment and the like, so that a plurality of problems still need to be solved urgently, and particularly the important problems are the problems of low carbon-nitrogen ratio and low temperature of sewage; the sewage treatment plant in northern cities and towns in China generally has the problem of poor denitrification effect under the low-temperature condition in winter, and the traditional activated sludge system cannot meet the requirement of effluent quality. In order to ensure the stable operation of sewage treatment under low temperature conditions, measures such as improving the heat preservation effect of structures, increasing the hydraulic retention time, reducing the sludge load, increasing the filler thickness or combining physical and chemical methods for denitrification and the like are mostly adopted in engineering application. However, these measures will greatly increase the capital cost and the operating cost of the sewage treatment facility, and cause a serious economic burden. In addition, with the increasing concentration of nitrogen pollutants in town sewage and the interception or consumption of partial organic matters in the first stage in the process of town sewage treatment, sewage plants generally face the phenomena of low sewage C/N, insufficient denitrification capability and the like in the denitrification treatment stage at present, so that the situation that the TN of the effluent is not up to the standard is more frequent. In order to ensure the discharge reaching the standard, a sewage treatment plant usually adds a carbon source in a denitrification stage, but the currently added carbon source has the defects of poor effect, difficult addition, high cost and the like.
Disclosure of Invention
The invention provides a system and a process for enhancing the denitrification effect of sewage with low C/N ratio by fermentation, wherein a bioreactor is arranged on the return path of mixed liquid for sewage treatment to generate substances for promoting denitrification so as to enhance the denitrification effect of the sewage and provide a carbon source, thereby effectively solving the problem of poor denitrification effect under the conditions of low temperature and low carbon. In order to realize the purpose, the invention discloses the following technical scheme:
in a first aspect of the invention, a system for enhancing the denitrification effect of sewage with low C/N ratio by fermentation is provided, which comprises an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a bioreactor. Wherein: the anaerobic tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank are sequentially connected. The bioreactor comprises a tank body, and an aeration device and a stirrer which are arranged in the tank body, wherein a water inlet pipe of the tank body is connected with a mixed liquid return pipe between the aerobic tank and the secondary sedimentation tank, and a water outlet pipe of the tank body is communicated with the anoxic tank. The tank body is also provided with a feeding hole, an air inlet pipe and an exhaust pipe so as to conveniently introduce carbon source gas required by fermentation into the bioreactor and ensure the balance of the air pressure inside and outside the bioreactor through the exhaust pipe.
Further, be provided with storage container between jar body and the oxygen deficiency pond, wherein, the outlet pipe of jar body and storage container's inlet intercommunication, the oxygen deficiency pond communicates with storage container's liquid outlet.
Further, the liquid outlet of mixed liquid back flow divide into two branches, one of them branch road with the inlet tube connection of the jar body, another branch road with the oxygen deficiency pond intercommunication to adopt partial backward flow liquid to be used for the bioreactor fermentation, its and backward flow liquid get into the retrieval and utilization in the oxygen deficiency pond.
Furthermore, the feed inlet is an openable feed inlet, so that micro-aerobic and anoxic reactions can be carried out after the feed inlet is closed, and the humic acid generated in the process can promote the denitrification process of sewage treatment.
Further, the lower part of the tank body is connected with a discharge hole so as to discharge solid materials such as sludge and material residues at the bottom of the bioreactor.
In a second aspect of the present invention, a process for enhancing denitrification effect of sewage with low C/N ratio by fermentation is provided, which comprises the following steps:
(1) the method comprises the steps of adding a microbial inoculum, solid waste and sludge from a secondary sedimentation tank into a tank body, and then adding a backflow mixed solution into the tank body through a mixed solution backflow pipe and a water inlet pipe. Then starting an aeration device and a stirrer to carry out aerobic fermentation.
(2) And (2) after the aerobic fermentation in the step (1) is finished, closing the aeration device and the feed inlet, adjusting the stirrer to be in intermittent stirring, simultaneously performing anaerobic fermentation by passing carbon dioxide-containing gas into the tank body through the gas inlet pipe, and conveying fermentation liquor into the aerobic tank after the anaerobic fermentation is finished so as to strengthen the denitrification effect of sewage in the aerobic tank, provide a carbon source for the sewage in the aerobic tank and overcome the problem of poor denitrification effect of the sewage under the conditions of low temperature and low carbon.
Further, in the step (1), the microbial inoculum comprises any one or more of white rot fungi, trichoderma viride, bacillus megaterium, bacillus amyloliquefaciens and bacillus subtilis. Preferably, the microbial inoculum is prepared by combining white rot fungi, trichoderma viride, bacillus amyloliquefaciens and bacillus subtilis.
Further, in the step (1), the solid waste comprises a composition of household garbage, agricultural waste and modified coal cinder. After the solid waste and the microbial inoculum are subjected to aerobic decomposition and anaerobic acidogenic fermentation in the reactor, a high-efficiency denitrification carbon source-volatile fatty acid can be generated, and the problem of poor sewage denitrification effect under the low-temperature and low-carbon conditions can be effectively solved after the high-efficiency denitrification carbon source-volatile fatty acid is added into an aerobic tank.
Optionally, the household garbage comprises kitchen garbage and the like, and is crushed into particles with the particle size of 0.2-1 cm before use.
Optionally, the agricultural waste comprises at least one of ground straw, distillers grains, bagasse, or the like.
Optionally, the modified coal cinder is obtained by soaking coal cinder in nitric acid and then cleaning with clean water.
Further, in the step (1), after the reflux mixed liquor is added, the solid-liquid ratio in the tank body is 1: 3.
Further, in the step (1), the aerobic fermentation time is 20-30 h, and the stirring speed is 60-100 r/min.
Further, in the step (2), the fermentation liquor is transferred to a storage container for temporary storage, and then the fermentation liquor is conveyed to the aerobic tank through the storage container.
Further, in the step (2), the anaerobic fermentation time is 6-10 h, the intermittent stirring period is 30-60 min, and the stirring speed is 20-40 r/min. After the aeration device and the feed inlet are closed, the micro-aerobic fermentation in the tank body is gradually transited to anaerobic fermentation, and humic acid is generated through the process.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the bioreactor is arranged on the return path of the mixed liquid, so that the nitrogen removal rate of sewage can be promoted by directly utilizing nutrient substances and humus in wastes, volatile fatty acid generated by aerobic fermentation of the bioreactor is a micromolecule substance which is most suitable as a carbon source, and humic acid generated by an anaerobic fermentation process is used as a promoting substance of the electronic shuttle body to effectively promote the denitrification process of sewage treatment, so that the sewage nitrogen removal process is promoted from multiple aspects, the nitrogen removal effect of sewage with a low C/N ratio is effectively enhanced, and the problem of poor nitrogen removal effect of sewage under the conditions of low temperature and low carbon is solved.
(2) The bioreactor is directly and additionally arranged outside the sewage treatment system, and has no special requirement on the installation environment. Thus, the installation of the bioreactor does not require substantial modification of the original sewage treatment plant. And the bioreactor takes waste and wastewater of a sewage plant as raw materials, so that the raw materials are cheap and easy to obtain, and the aim of treating the waste by the waste is fulfilled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of the embodiment of enhancing denitrification effect of low C/N ratio sewage by fermentation.
FIG. 2 is a schematic view of the structure of the bioreactor in the example.
The above referenced figures represent: 1-anaerobic tank, 2-anoxic tank, 3-aerobic tank, 4-secondary sedimentation tank, 5-bioreactor, 5.1-tank, 5.2-aeration device, 5.3-stirrer, 5.4-water inlet pipe, 5.5-mixed liquid return pipe, 5.6-water outlet pipe, 5.7-feed inlet, 5.8-air inlet pipe, 5.9-exhaust pipe, 5.10-discharge outlet and 6-storage container.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the connecting elements may be mechanically connected, directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations. The invention will now be further described with reference to the drawings and detailed description of preferred embodiments, in which the preferred methods and materials are described for illustrative purposes only.
First embodiment
Referring to fig. 1 and 2, there is illustrated a system for enhancing denitrification effect of sewage with low C/N ratio by fermentation, which comprises the following components: anaerobic tank 1, oxygen deficiency pond 2, good oxygen pond 3, secondary sedimentation tank 4 and bioreactor 5, wherein:
the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3 and the secondary sedimentation tank 4 are connected in sequence. Wherein, the anaerobic pool 1 at the first stage mainly carries out the phosphorus release process of the sewage, so that the phosphorus concentration of the sewage is increased, the soluble organic matters are absorbed by bacteria, and the other part of NH is3-N is removed due to cellular synthesis. In the anoxic pond 2, denitrifying bacteria take organic matters of sewage as carbon sources to bring a large amount of NO into the reflux mixed liquor3-N and NO2Reduction of-N to N2Is released to the air. In the aerobic tank 3, the organic matter is oxidized by the microorganism and then continuously descends, and the organic nitrogen is ammoniated and then nitrifiedTo make NH3The N concentration drops significantly, but NO is produced as a result of the nitration process3The N concentration increases, and phosphorus also decreases at a faster rate with excessive uptake by the P-accumulating bacteria. The sewage part treated by the aerobic tank 3 flows back to the anoxic tank 2 and the bioreactor 5 through a return pipe, and the residual sewage flows into a secondary sedimentation tank for sedimentation.
Referring to fig. 2, the bioreactor 5 includes a tank 5.1, an aeration device 5.2 and a stirrer 5.3, the aeration device 5.2 and the stirrer 5.3 are both disposed at the bottom of the tank 5.1, the aeration device 5.2 is used for delivering oxygen-containing air into the tank 5.1 to facilitate aerobic fermentation of the microbial inoculum therein, and the stirrer 5.3 is used for stirring the fermentation liquid to facilitate uniform distribution and full utilization of nutrients.
The lateral wall upper portion of jar body 5.1 is connected with inlet tube 5.4 and feed inlet 5.7, feed inlet 5.7 are used for adding the required solid nutrient substance of fermentation, just feed inlet 5.7 is openable feed inlet to carry out micro-aerobic and oxygen deficiency reaction after sealing, the humic acid that this process produced can promote sewage treatment's denitrification process.
The water inlet pipe 5.4 is used for filling liquid phase required by fermentation, such as clear water or mixed reflux liquid from the aerobic tank 3 and the like, into the tank body 5.1; in this embodiment, inlet tube 5.4 is connected with mixed liquid back flow 5.5 between aerobic tank 3 and the secondary sedimentation tank 4, moreover mixed liquid back flow 5.5's liquid outlet divide into two branches, one of them branch road with the inlet tube 5.4 of jar body 5.1 is connected, another branch road with oxygen deficiency pond 2 intercommunication to adopt partial backward flow to be used for bioreactor 5 fermentation, so that utilize the backward flow, need additionally to add the clear water when the backward flow is not enough, other backward flows get into the retrieval and utilization in the oxygen deficiency pond 2.
The side wall of the tank body 5.1 is also connected with a water outlet pipe 5.6 which is communicated with the anoxic tank 2, so that fermentation liquor in the tank body 5.1 is conveyed to the anoxic tank 2 to promote denitrification reaction therein, and the effect of sewage denitrification is improved. An air inlet pipe 5.8 and an air outlet pipe 5.9 are arranged on the top surface of the tank body 5.1, so that carbon source gas required by fermentation can be conveniently introduced into the bioreactor 5, and the balance of the internal air pressure and the external air pressure of the tank body 5.1 is ensured through the air outlet pipe.
The lower part of the tank body 5.1 is connected with a discharge hole 5.10 so as to discharge solid materials such as sludge, material residues and the like at the bottom of the bioreactor 5.
With continued reference to fig. 1, in a preferred embodiment, a storage container 6 is further disposed between the tank 5.1 and the anoxic tank 2, wherein a water outlet pipe 5.6 of the tank 5.1 is communicated with a liquid inlet of the storage container 6, and the anoxic tank 2 is communicated with a liquid outlet of the storage container 6, so that fermentation liquid generated in the bioreactor is transferred through the storage container 6 and then added into the anoxic tank 2, thereby enhancing denitrification of sewage, providing a carbon source, and overcoming a problem of poor denitrification effect of sewage under low-temperature and low-carbon conditions.
Second embodiment
A process for strengthening the denitrification effect of sewage with low C/N ratio comprises the following steps:
(1) through to add microbial inoculum, solid useless and the mud that comes from secondary sedimentation pond 4 in jar body 5.1, wherein: the microbial inoculum is white rot fungus, trichoderma viride, bacillus amyloliquefaciens and bacillus subtilis according to the ratio of 2: 1: 1: 1, combining the components in proportion; and the viable count of the white rot fungi and the trichoderma viride is more than 2.0 multiplied by 107The number of viable bacteria of the bacillus amyloliquefaciens and the bacillus subtilis microbial inoculum is more than 2.0 multiplied by 108. The solid waste comprises kitchen waste, crushed straws and modified coal cinder, wherein the kitchen waste is particles crushed to be 0.2-1 cm in particle size. The modified coal cinder is obtained by soaking coal cinder in nitric acid and then cleaning the coal cinder with clean water.
(2) Adding the reflux mixed liquid into the tank body 5.1 through the mixed liquid reflux pipe 5.5 and the water inlet pipe 5.4 to ensure that the solid-liquid ratio is 1:3, the residual reflux liquid flows into the aerobic tank 3 through a reflux pipe, then an aeration device 5.2 is started to blow air into the tank body 5.1, the stirring speed of the stirrer 5.3 is 80r/min, and aerobic fermentation is carried out for 24 hours under the condition.
(3) After the aerobic fermentation in the step (2) is finished, closing the aeration device 5.2 and the feed inlet 5.7, adjusting the stirrer 5.3 to be in intermittent stirring (the stirring period is 45min), simultaneously passing waste gas containing carbon dioxide into the tank body 5.1 through the air inlet pipe 5.8, performing anaerobic fermentation for 8h under the conditions, conveying the fermentation liquor into the storage container 6 after the anaerobic fermentation is finished, quantitatively supplementing the fermentation liquor into the anoxic tank 2 through the storage container 6, and adjusting the dosage according to the quality of inlet water, wherein the dosage of the embodiment is 20L per ton of treatment capacity, and the dosage is supplemented to strengthen the denitrification effect of sewage in the anoxic tank. The contents of Chemical Oxygen Demand (COD) and Volatile Fatty Acids (VFAs) in the storage vessel 6 and the contents of total nitrogen and nitrite nitrogen in the effluent of the secondary sedimentation tank 4 were measured, and the results are shown in tables 1 and 2.
Third embodiment
A process for strengthening the denitrification effect of sewage with low C/N ratio comprises the following steps:
(1) through to add microbial inoculum, solid useless and the mud that comes from secondary sedimentation pond 4 in jar body 5.1, wherein: the microbial inoculum is white rot fungus, trichoderma viride, bacillus amyloliquefaciens and bacillus subtilis according to the ratio of 2: 1: 1: 1, combining the components in proportion; and the viable count of the white rot fungi and the trichoderma viride is more than 2.0 multiplied by 107The number of viable bacteria of the bacillus amyloliquefaciens and the bacillus subtilis microbial inoculum is more than 2.0 multiplied by 108. The solid waste comprises kitchen waste, crushed straws and modified coal cinder, wherein the kitchen waste is particles crushed to be 0.2-1 cm in particle size. The modified coal cinder is obtained by soaking coal cinder in nitric acid and then cleaning the coal cinder with clean water.
(2) Adding the reflux mixed liquid into the tank body 5.1 through the mixed liquid reflux pipe 5.5 and the water inlet pipe 5.4 to ensure that the solid-liquid ratio is 1:3, the residual reflux liquid flows into the aerobic tank 3 through a reflux pipe, then an aeration device 5.2 is started to blow air into the tank body 5.1, the stirring speed of the stirrer 5.3 is 80r/min, and aerobic fermentation is carried out for 24 hours under the condition.
(3) After the aerobic fermentation in the step (2) is finished, the fermentation liquor is conveyed into a storage container 6, and then is quantitatively supplemented into the anoxic tank 2 through the storage container 6, the dosage is adjusted according to the quality of inlet water, in the embodiment, the dosage is 100L per ton of treatment capacity, and the supplement is used for enhancing the denitrification of sewage in the anoxic tank. The contents of Chemical Oxygen Demand (COD) and Volatile Fatty Acids (VFAs) in the storage vessel 6 and the contents of total nitrogen and nitrite nitrogen in the effluent of the secondary sedimentation tank 4 were measured, and the results are shown in tables 1 and 2.
Fourth embodiment
A process for strengthening the denitrification effect of sewage with low C/N ratio comprises the following steps:
(1) through to add microbial inoculum, solid useless and the mud that comes from secondary sedimentation pond 4 in jar body 5.1, wherein: the microbial inoculum is white rot fungus, trichoderma viride, bacillus amyloliquefaciens and bacillus subtilis according to the proportion of 2: 1: 1: 1, combining the components in proportion; the number of viable bacteria of the white rot fungi and the trichoderma viride is more than 2.0 multiplied by 107The number of viable bacteria of the bacillus amyloliquefaciens and the bacillus subtilis microbial inoculum is more than 2.0 multiplied by 108. The solid waste comprises kitchen waste, crushed straws and modified coal cinder, wherein the kitchen waste is particles crushed to be 0.2-1 cm in particle size. The modified coal cinder is obtained by soaking coal cinder in nitric acid and then cleaning the coal cinder with clean water.
(2) Adding the reflux mixed liquid into the tank body 5.1 through the mixed liquid reflux pipe 5.5 and the water inlet pipe 5.4 to ensure that the solid-liquid ratio is 1: and 3, allowing the residual reflux to flow into the aerobic tank 3 through a reflux pipe, closing the aeration device 5.2 and the feeding hole 5.7, adjusting the stirrer 5.3 to be in intermittent stirring (the stirring period is 45min), allowing waste gas containing carbon dioxide to pass through the tank body 5.1 through the air inlet pipe 5.8, performing anaerobic fermentation for 8h under the conditions, conveying the fermentation liquor to the storage container 6 after completion, quantitatively replenishing the fermentation liquor to the anoxic tank 2 through the storage container 6, adjusting the adding amount according to the quality of inlet water, wherein the adding amount is 90L per ton of treatment amount in the embodiment, detecting the Chemical Oxygen Demand (COD) and Volatile Fatty Acids (VFAs) content in the storage container 6, and detecting the content of total nitrogen and nitrite nitrogen in outlet water of the secondary sedimentation tank 4, wherein the results are shown in tables 1 and 2.
Fifth embodiment
The sewage denitrification effect of the sewage treatment system without the bioreactor 5, that is, the sewage treatment system without the bioreactor 5 in fig. 1, was tested, specifically, the Chemical Oxygen Demand (COD) and Volatile Fatty Acids (VFAs) contents in the aerobic tank 3 were measured, and the total nitrogen and nitrite nitrogen contents in the effluent of the secondary sedimentation tank 4 were measured, and the results are shown in tables 1 and 2.
TABLE 1
TABLE 2
In the above test results, the VFAs were determined by chromatography. The SCOD determination method is the method of environmental protection industry standard HJ/T399-. The total nitrogen determination method is the method described in environmental protection industry standard HJ/T636-2012 of the people's republic of China. The nitrite determination method is the method of environmental protection industry standard GB7493-87 of the people's republic of China.
As can be seen from the test results of table 1: the third and fourth examples had a certain amount of soluble COD produced, while the fourth example had a certain amount of VFAs accumulated via the anaerobic acidogenic process, while the second example had a large amount of soluble COD and volatile fatty acids produced.
As can be seen from the test results in Table 2, the total nitrogen removal in the second example was best with little nitrite accumulation, and the total nitrogen removal in the fourth example was second with little nitrite remaining due to: decomposing macromolecular substances into small molecular substances by aerobic microorganisms such as white-rot fungi, Trichoderma viride, Bacillus, etc. in the aerobic fermentation process, and then generating volatile fatty acid by anaerobic fermentation, wherein CO in the anaerobic process2The introduction of the organic acid into the solution to inhibit the generation of methane ensures the yield of VFAs, and humic acid in the raw material and sludge can be released in the solution again in the decomposition process and the anaerobic pH change process of the white rot fungi, and the organic acid can be used as an electronic shuttle to further promote the denitrification process of sewage treatmentThe problem of low nitrogen removal efficiency caused by insufficient carbon source in the sewage with low C/N ratio is solved. The total nitrogen removal effect in the third embodiment is relatively poor, and the effluent also has less nitrite residue. The low total nitrogen removal in the fifth example was due to insufficient carbon source in the wastewater, which also produced large nitrite accumulation in the effluent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A system for strengthening the denitrification effect of sewage with low C/N ratio by fermentation is characterized by comprising an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence; the device also comprises a bioreactor, the bioreactor comprises a tank body, an aeration device and a stirrer, the aeration device and the stirrer are arranged in the tank body, a water inlet pipe of the tank body is connected with a mixed liquid return pipe between the aerobic tank and the secondary sedimentation tank, and a water outlet pipe of the tank body is communicated with the anoxic tank; the tank body is also provided with a feed inlet, an air inlet pipe and an exhaust pipe.
2. The system for enhancing denitrification of sewage with low C/N ratio by fermentation as claimed in claim 1, wherein a storage container is disposed between the tank and the anoxic tank, wherein the water outlet pipe of the tank is communicated with the liquid inlet of the storage container, and the anoxic tank is communicated with the liquid outlet of the storage container.
3. The system for enhancing denitrification effect of sewage with low C/N ratio by fermentation as claimed in claim 1, wherein the liquid outlet of the mixed liquid return pipe is divided into two branches, one branch is connected with the water inlet pipe of the tank body, and the other branch is communicated with the anoxic tank.
4. The system for enhancing denitrification of sewage with low C/N ratio using fermentation of claim 1 wherein said inlet is an openable and closable inlet.
5. The system for enhancing denitrification effect of sewage with low C/N ratio by fermentation according to any one of claims 1-4, wherein the lower part of the tank body is connected with a discharge port.
6. A process for enhancing denitrification effect of sewage with low C/N ratio by fermentation, which is implemented by the system for enhancing denitrification effect of sewage with low C/N ratio by fermentation as claimed in any one of claims 1 to 5, the process comprising the following steps:
(1) adding a microbial inoculum, solid waste and sludge from a secondary sedimentation tank into the tank body, and then adding a reflux mixed solution into the tank body through the mixed solution reflux pipe and the water inlet pipe; then starting an aeration device and a stirrer to perform aerobic fermentation;
(2) and (2) after the aerobic fermentation in the step (1) is finished, closing the aeration device and the feed inlet, adjusting the stirrer to be in intermittent stirring, simultaneously performing anaerobic fermentation by passing carbon dioxide-containing gas into the tank body through the gas inlet pipe, and conveying the fermentation liquor into an aerobic tank to obtain the fermentation liquor.
7. The process for enhancing denitrification effect of sewage with low C/N ratio by fermentation as claimed in claim 6, wherein in the step (1), the microbial inoculum comprises any one or more of the group consisting of decay fungi, Trichoderma viride, Bacillus megaterium, Bacillus amyloliquefaciens and Bacillus subtilis; preferably, the microbial inoculum is prepared by combining white rot fungi, trichoderma viride, bacillus amyloliquefaciens and bacillus subtilis.
8. The process for enhancing denitrification effect of sewage with low C/N ratio by fermentation as claimed in claim 6, wherein in the step (1), the solid waste comprises composition of domestic garbage, agricultural waste and modified coal cinder;
preferably, the household garbage comprises kitchen garbage, and is crushed into particles with the particle size of 0.2-1 cm before use;
preferably, the agricultural waste comprises at least one of crushed straw, distillers grains, bagasse;
preferably, the modified coal cinder is obtained by soaking coal cinder in nitric acid and then cleaning the coal cinder with clean water.
9. The process for enhancing the denitrification effect of sewage with low C/N ratio by fermentation as claimed in claim 6, wherein in the step (1), the aerobic fermentation time is 20-30 h, and the stirring speed is 60-100 r/min; preferably, in the step (1), after the reflux mixed solution is added, the solid-to-liquid ratio in the tank body is 1: 3.
10. The process for enhancing the denitrification effect of sewage with low C/N ratio by fermentation as claimed in claim 6, wherein in the step (2), the anaerobic fermentation time is 6-10 h, the intermittent stirring period is 30-60 min, and the stirring rotation speed is 20-40 r/min; preferably, in the step (2), the fermentation liquor is transferred to a storage container for temporary storage, and then the fermentation liquor is conveyed to the aerobic tank through the storage container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210192080.XA CN114477422A (en) | 2022-02-28 | 2022-02-28 | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210192080.XA CN114477422A (en) | 2022-02-28 | 2022-02-28 | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114477422A true CN114477422A (en) | 2022-05-13 |
Family
ID=81485216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210192080.XA Pending CN114477422A (en) | 2022-02-28 | 2022-02-28 | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114477422A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609650A (en) * | 2015-01-01 | 2015-05-13 | 北京工业大学 | Device and method for coupling surplus sludge fermentation with two-sludge denitrifying phosphorus removal |
| JP2016010777A (en) * | 2014-06-30 | 2016-01-21 | 積水化学工業株式会社 | Method and apparatus for performing anaerobic treatment |
| CN111410313A (en) * | 2020-04-07 | 2020-07-14 | 西安理工大学 | Side-flow type enhanced biological phosphorus removal process |
| CN111547846A (en) * | 2020-04-07 | 2020-08-18 | 中圣环境科技发展有限公司 | By-pass flow type biological phosphorus removal process |
| CN112250179A (en) * | 2020-09-23 | 2021-01-22 | 北京工业大学 | Device and method for realizing short-cut nitrification-anaerobic ammonia oxidation denitrification in sewage treatment continuous flow process through sludge fermentation product |
| CN113620525A (en) * | 2021-08-16 | 2021-11-09 | 华夏碧水环保科技有限公司 | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment |
-
2022
- 2022-02-28 CN CN202210192080.XA patent/CN114477422A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016010777A (en) * | 2014-06-30 | 2016-01-21 | 積水化学工業株式会社 | Method and apparatus for performing anaerobic treatment |
| CN104609650A (en) * | 2015-01-01 | 2015-05-13 | 北京工业大学 | Device and method for coupling surplus sludge fermentation with two-sludge denitrifying phosphorus removal |
| CN111410313A (en) * | 2020-04-07 | 2020-07-14 | 西安理工大学 | Side-flow type enhanced biological phosphorus removal process |
| CN111547846A (en) * | 2020-04-07 | 2020-08-18 | 中圣环境科技发展有限公司 | By-pass flow type biological phosphorus removal process |
| CN112250179A (en) * | 2020-09-23 | 2021-01-22 | 北京工业大学 | Device and method for realizing short-cut nitrification-anaerobic ammonia oxidation denitrification in sewage treatment continuous flow process through sludge fermentation product |
| CN113620525A (en) * | 2021-08-16 | 2021-11-09 | 华夏碧水环保科技有限公司 | Integrated device suitable for low carbon nitrogen ratio domestic sewage treatment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103641272B (en) | High concentrated organic wastewater and percolate zero-discharge treatment system | |
| CN101811797B (en) | Coal gasification waste water biochemical treatment equipment and method | |
| CN100422096C (en) | Apparatus and method of treating city domestic refuse percolation liquid by two-stage UASB+A/O technique | |
| CN101786730B (en) | Method and equipment for cross backflow two-stage double-expansion granular sludge treatment of coking wastewater | |
| KR100815017B1 (en) | Method For Purifying Leachate of Landfill and Dewatering Water of Food Waste | |
| EA024049B1 (en) | Sludge treatment method and apparatus and application of said method and apparatus for wastewater bio-treatment | |
| CN105540841A (en) | Method and equipment for aerobic/anaerobic biofilter biological denitrogenation | |
| CN102642985A (en) | Method and system for treatment and recycling of feces and waste from livestock and poultry culture | |
| CN108328871A (en) | Landfill leachate efficient denitrification system and its denitrification process | |
| CN106430565A (en) | Combined treatment process for sewage low-consumption treatment and energy recovery based on direct carbon source conversion and biological nitrogen removal | |
| CN101704611B (en) | Method for processing percolation liquid of domestic garbage | |
| CN105174622A (en) | System and method suitable for treating high concentration organic wastewater | |
| CN208166784U (en) | A kind of rural area landfill leachate high-efficient treatment device | |
| CN101805096B (en) | Method for treating rubbish percolates of different times for deep denitrification by using bipolar USAB+A/O+SBR process | |
| CN216890310U (en) | Sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device | |
| CN2543951Y (en) | Filling type baffle biological reactor | |
| CN209872514U (en) | Composite ecological reactor based on A2O | |
| CN110002683A (en) | Handle the continuous flow A of moderate strength municipal sewage containing ammonia nitrogen2O couples UASB denitrification dephosphorization apparatus and method | |
| CN201614333U (en) | Decentralized sewage treatment device | |
| CN113698049A (en) | Process for treating and recycling pig-raising wastewater containing water-washed manure and water-soaked manure | |
| CN112919736A (en) | Anaerobic denitrification and methane removal device and method, sewage treatment system and method | |
| CN2931465Y (en) | Apparatus of treating city domestic refuse percolation liquid by two-stage UASB+A/O technique | |
| CN114477422A (en) | System and process for enhancing denitrification effect of sewage with low C/N ratio by utilizing fermentation | |
| CN205035221U (en) | Organic waste water's processing system | |
| CN114477657A (en) | Biological intensified treatment technology for high-concentration waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |