CN117534256A - Rural domestic sewage treatment method - Google Patents
Rural domestic sewage treatment method Download PDFInfo
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- CN117534256A CN117534256A CN202311786036.2A CN202311786036A CN117534256A CN 117534256 A CN117534256 A CN 117534256A CN 202311786036 A CN202311786036 A CN 202311786036A CN 117534256 A CN117534256 A CN 117534256A
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- 239000010865 sewage Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011282 treatment Methods 0.000 title claims abstract description 20
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 4
- UEKDBDAWIKHROY-UHFFFAOYSA-L bis(4-bromo-2,6-ditert-butylphenoxy)-methylalumane Chemical compound [Al+2]C.CC(C)(C)C1=CC(Br)=CC(C(C)(C)C)=C1[O-].CC(C)(C)C1=CC(Br)=CC(C(C)(C)C)=C1[O-] UEKDBDAWIKHROY-UHFFFAOYSA-L 0.000 claims abstract 5
- 239000000463 material Substances 0.000 claims description 32
- 239000012528 membrane Substances 0.000 claims description 31
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims description 26
- 229920002472 Starch Polymers 0.000 claims description 22
- 239000008107 starch Substances 0.000 claims description 22
- 235000019698 starch Nutrition 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229920002748 Basalt fiber Polymers 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 239000011300 coal pitch Substances 0.000 claims description 8
- 239000012510 hollow fiber Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000011294 coal tar pitch Substances 0.000 claims description 7
- 244000005700 microbiome Species 0.000 claims description 7
- 244000063299 Bacillus subtilis Species 0.000 claims description 6
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011968 lewis acid catalyst Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 241000235645 Pichia kudriavzevii Species 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 6
- 239000011574 phosphorus Substances 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 6
- 239000000725 suspension Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 15
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005273 aeration Methods 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000007833 carbon precursor Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 239000002054 inoculum Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 1
- 235000019799 monosodium phosphate Nutrition 0.000 description 1
- -1 on the other hand Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- 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
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F3/02—Aerobic processes
Landscapes
- 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)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a method for treating rural domestic sewage, which comprises the steps of removing larger suspended matters from sewage through a grid, enabling the sewage to enter a micro-electrolysis reactor, enabling the sewage to enter an MABR (micro-electrolysis reactor) after micro-electrolysis treatment, treating the sewage again in the MABR, and standing and settling the effluentThe method can separate clear liquid, and through tests, the method can effectively reduce COD in sewage cr 、BOD 5 Total nitrogen, total phosphorus and solid suspensions.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a rural domestic sewage treatment method.
Background
Common sewage treatment facilities in rural areas such as septic tanks and the like ensure the environmental sanitation of living communities, and prevent the diffusion of domestic sewage and pollutants in living environments. However, as the number of sewage treatment facilities such as septic tanks and the like is increased, it is urgent to rationally treat the sewage generated thereby.
Disclosure of Invention
The invention aims to: aiming at the technical problems, the invention provides a rural domestic sewage treatment method.
The technical scheme adopted is as follows:
a method for treating rural domestic sewage comprises the following steps:
the sewage enters a micro-electrolysis reactor after larger suspended matters are removed through a grid, enters an MABR reactor after micro-electrolysis treatment, is treated again in the MABR reactor, and is subjected to standing precipitation after effluent, and clear liquid is separated out;
the micro-electrolysis reactor contains an iron-carbon micro-electrolysis material, and the iron-carbon micro-electrolysis material is prepared from the following raw materials in parts by weight:
20-30 parts of coal tar pitch, 40-60 parts of iron powder, 3-5 parts of Lewis acid catalyst, 5-10 parts of cobalt powder, 1-5 parts of basalt fiber, 5-10 parts of binder and 3-6 parts of pore-forming agent.
Further, the membrane carrier of the MABR reactor is PVDF hollow fiber membrane.
Further, the PVDF hollow fiber membrane has a membrane pore diameter of 0.15-0.25 μm.
Further, the membrane carrier has microorganisms attached thereto.
Further, the microorganism includes Issatchenkia orientalis and Bacillus subtilis.
Further, the Lewis acid catalyst is AlCl 3 、BF 3 、SbCl 3 、FeBr 3 、FeCl 3 、SnCl 3 、TiCl 3 、ZnCl 2 Any one or more combinations thereof.
Further, the binder is bentonite and/or dolomite.
Further, the pore-forming agent is micro-carbonized starch.
Further, the preparation method of the micro carbonized starch comprises the following steps:
dissolving soluble starch in water, heating and stirring to form transparent solution, transferring the solution into a hydrothermal reaction kettle, sealing and heating to 185-205 ℃ for reaction for 60-120min, cooling to normal temperature after the reaction is finished, filtering out precipitate, washing and drying.
Further, the preparation method of the iron-carbon micro-electrolysis material comprises the following steps:
mixing coal pitch, iron powder, lewis acid catalyst, cobalt powder, basalt fiber, binder and pore-forming agent uniformly, mixing with a proper amount of water, granulating, drying the obtained granules, transferring into a crucible, sealing, transferring into a muffle furnace, roasting at 600-800 ℃ for 3-6h, and naturally cooling.
The invention has the beneficial effects that:
the invention provides a rural domestic sewage treatment method, in MABR reactor, issatchenkia orientalis and bacillus subtilis are attached to the surface of hollow fiber membrane, through splitting growth and continuous adsorption, form the stable microbial membrane with three-dimensional structure gradually, carry on the secondary treatment through the micro-electrolysis reactor after carrying on the primary treatment to the sewage, passivation harden problem that the existing iron-carbon micro-electrolysis material exists, the treatment effect is not ideal, the inventor adopts coal pitch as the active carbon precursor, the iron-carbon micro-electrolysis material prepared has larger specific surface area, and the iron-carbon combines together and is difficult to develop the layering and caking phenomenon of iron-carbon, easy to mix with sewage uniformly, basalt fiber as fibrous skeleton can raise the intensity and anti-hardening performance of the material, and also has certain positive effects on raising the treatment effect, micro-carbonized starch is taken as pore-forming agent, help to raise the open pore number and porosity of the material, the abundant pore space has raised the anti-blocking, anti-hardening ability of the material to a certain extent, make the material contact with sewage more fully, through test, the invention can lower COD in the sewage effectively cr 、BOD 5 Total nitrogen, total phosphorus and solid suspensions.
Drawings
FIG. 1 is a photograph of the iron-carbon micro-electrolytic material prepared in example 1;
fig. 2 is a schematic flow chart of the sewage treatment method provided by the invention.
Detailed Description
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. The technology not mentioned in the present invention refers to the prior art, and unless otherwise indicated, the following examples and comparative examples are parallel tests, employing the same processing steps and parameters.
Example 1:
a method for treating rural domestic sewage comprises the following steps:
the invention takes sewage after being treated by a septic tank in a district of Tung county in Hangzhou as a test object, the district uses an independent sewage discharge system, no other sewage of chemical plants, hospitals and the like is injected into a drainage system of the district, the septic tank is cleaned and drawn out in 8 months of 2023, the sampling time is 2023 and 9 months, and various parameters are shown in the following table 1;
table 1:
the glass container with a stirrer and an air pump is used for simulating a micro-electrolysis reactor, an iron-carbon micro-electrolysis material is added into the glass container, the dosage of the iron-carbon micro-electrolysis material is 10 percent of the weight of sewage after the treatment of a septic tank, the sewage enters the micro-electrolysis reactor and is simultaneously stirred at a low speed by the stirrer, air is introduced by the air pump, the flow rate of the air is 750mL/min, the air is pumped into the MABR reactor after staying for 3 hours, the sewage treated by the micro-electrolysis reactor is sampled, kept stand and precipitated for 24 hours, then water quality detection is carried out, and COD is calculated cr Total nitrogen, total phosphorus and removal of solid suspended matter, results are shown in table 2:
table 2:
the iron-carbon micro-electrolysis material is prepared from the following raw materials in parts by weight:
25 parts of coal tar pitch, 50 parts of iron powder, 4 parts of aluminum trichloride, 8 parts of cobalt powder, 3 parts of basalt fiber, 10 parts of bentonite and 4 parts of micro-carbonized starch.
The preparation method of the micro-carbonized starch comprises the following steps:
dissolving soluble starch in water, heating and stirring to form transparent solution, transferring the solution into a hydrothermal reaction kettle, sealing and heating to 200 ℃ for reaction for 90min, cooling to normal temperature after the reaction is finished, filtering out precipitate, washing and drying.
The preparation method of the iron-carbon micro-electrolysis material comprises the following steps:
uniformly mixing coal pitch, iron powder, aluminum trichloride, cobalt powder, basalt fiber, bentonite and micro-carbonized starch to obtain a mixture, and mixing the mixture with deionized water according to a weight ratio of 1:1, mixing and granulating, drying the obtained granules, transferring the granules into a crucible, sealing and transferring the crucible into a muffle furnace, roasting for 5 hours at 750 ℃, and naturally cooling the crucible.
The MABR reactor is made of organic glass, a polyvinylidene fluoride (PVDF) hollow fiber curtain type membrane is adopted as a membrane carrier of the membrane aeration biological membrane reactor (MABR), the diameter of a membrane hole is 0.2 mu m, the membrane has good air permeability and mechanical property and strong chemical corrosion resistance, 20 membranes are arranged into a membrane assembly, and the membrane area is 100m 2 The hollow fiber membrane component is vertically arranged in the middle of the MABR reactor, the MABR membrane component is taken as a carrier for microorganism growth on one hand, so that microorganisms are enriched on the MABR membrane component to form an attached growth biological membrane, on the other hand, air in the inner cavity of the hollow fiber membrane penetrates through the membrane wall to supply oxygen to the microorganisms attached to the surface of the membrane, sewage is diluted by 10 times, added with the Issatchenia orientalis microbial agent (ATCC 6258) and the bacillus subtilis microbial agent (ATCC 6633), evenly stirred and mixed, and introduced into the MABR reactor, intermittent water feeding is performed during domestication, aeration is performed at the bottom, the aeration time of water feeding and aeration time of sealing are controlled to be 3:1, DO in the system is controlled to be 9-10mg/L, and the water feeding flow in the domestication period is 0.7m 3 And (3) supplementing glucose, urea and sodium dihydrogen phosphate at the water temperature of 25 ℃ in time, gradually forming a film by the film carrier, and finishing domestication when the COD concentration difference value of the effluent is not higher than 5%, namely finishing film forming, wherein the film forming time is 15 d;
pumping the sewage treated by the micro-electrolysis reactor into an MABR reactor with completed membrane hanging, wherein the volume flow of the sewage is 10L/min, the temperature of the MABR reactor is maintained at room temperature, compressed air is supplied to the inner cavity of the membrane through an air pump, the pressure and the flow of the air are respectively controlled by a valve and regulated through a gas flowmeter, the pressure in the membrane is maintained at 25kPa, the sewage stays in the MABR reactor for 7d, stands and precipitates for 24h, and clear liquid is taken for detection.
Example 2:
substantially the same as in example 1, except that the iron-carbon micro-electrolysis material was made of the following raw materials in parts by weight:
30 parts of coal tar pitch, 50 parts of iron powder, 5 parts of aluminum trichloride, 10 parts of cobalt powder, 5 parts of basalt fiber, 10 parts of bentonite and 6 parts of micro-carbonized starch.
The preparation method of the micro-carbonized starch is the same as that of the example 1;
the preparation method of the iron-carbon micro-electrolysis material comprises the following steps:
uniformly mixing coal pitch, iron powder, aluminum trichloride, cobalt powder, basalt fiber, bentonite and micro-carbonized starch to obtain a mixture, and mixing the mixture with deionized water according to a weight ratio of 1:1, mixing and granulating, drying the obtained granules, transferring the granules into a crucible, sealing and transferring the crucible into a muffle furnace, roasting for 6 hours at 800 ℃, and naturally cooling the crucible.
Example 3:
substantially the same as in example 1, except that the iron-carbon micro-electrolysis material was made of the following raw materials in parts by weight:
20 parts of coal tar pitch, 50 parts of iron powder, 3 parts of aluminum trichloride, 5 parts of cobalt powder, 1 part of basalt fiber, 5 parts of bentonite and 3 parts of micro-carbonized starch.
The preparation method of the micro-carbonized starch is the same as that of the example 1;
the preparation method of the iron-carbon micro-electrolysis material comprises the following steps:
uniformly mixing coal pitch, iron powder, aluminum trichloride, cobalt powder, basalt fiber, bentonite and micro-carbonized starch to obtain a mixture, and mixing the mixture with deionized water according to a weight ratio of 1:1, mixing and granulating, drying the obtained granules, transferring the granules into a crucible, sealing and transferring the crucible into a muffle furnace, roasting for 3 hours at 600 ℃, and naturally cooling the crucible.
Example 4:
substantially the same as in example 1, except that the iron-carbon micro-electrolysis material was made of the following raw materials in parts by weight:
25 parts of coal tar pitch, 60 parts of iron powder, 5 parts of aluminum trichloride, 5 parts of cobalt powder, 5 parts of basalt fiber, 5 parts of bentonite and 6 parts of micro-carbonized starch.
The preparation method of the micro-carbonized starch is the same as that of the example 1;
the preparation method of the iron-carbon micro-electrolysis material comprises the following steps:
uniformly mixing coal pitch, iron powder, aluminum trichloride, cobalt powder, basalt fiber, bentonite and micro-carbonized starch to obtain a mixture, and mixing the mixture with deionized water according to a weight ratio of 1:1, mixing and granulating, drying the obtained granules, transferring the granules into a crucible, sealing and transferring the crucible into a muffle furnace, roasting for 4 hours at 700 ℃, and naturally cooling the crucible.
Comparative example 1:
substantially the same as in example 1, except that the Issatchenkia orientalis inoculant was not added.
Comparative example 2:
substantially the same as in example 1, except that the Bacillus subtilis preparation was not added.
Comparative example 3:
substantially the same as in example 1, except that activated carbon was used instead of coal pitch.
Comparative example 4:
substantially the same as in example 1, except that basalt fiber was not added.
Comparative example 5:
substantially the same as in example 1, except that a commercially available corn starch was used as a pore-forming agent instead of the micro-carbonized starch.
Performance test-1:
the clear solutions obtained in examples 1 to 4 and comparative examples 1 to 5 were subjected to water quality detection to calculate COD cr Total nitrogen, total phosphorus and removal of solid suspended matter, results are shown in table 3:
table 3:
as can be seen from the above Table 3, the method of the present invention can effectively reduce COD in rural sewage cr 、BOD 5 Total nitrogen, total phosphorus and solid suspensions;
as can be seen from the comparison of the data of example 1 and comparative examples 1 and 2, the addition of the Issatchenkia orientalis and the Bacillus subtilis preparation is effective for increasing COD in sewage cr The removal effect of total nitrogen, total phosphorus and solid suspended matters plays a positive role;
the comparison of the data of the example 1 and the comparative example 3 shows that compared with the activated carbon, the coal tar pitch of the invention is more suitable for preparing the iron-carbon micro-electrolysis material and has better sewage treatment effect;
as can be seen from the comparison of the data of the embodiment 1 and the comparative example 4, the basalt fiber as the fiber skeleton can improve the strength and hardening resistance of the material, ensure the long-term stable and effective operation of the micro-electrolysis reactor and improve the sewage treatment effect;
as can be seen from the comparison of the data in the example 1 and the comparative example 5, the micro-carbonized starch is used as a pore-forming agent, which is helpful for improving the number of open pores and the porosity of the material, and the abundant pores improve the blocking resistance and hardening resistance of the material to a certain extent, so that the long-term stable and effective operation of the micro-electrolysis reactor is ensured, and the sewage treatment effect is improved.
Performance test-2:
the micro-electrolysis reactor is simulated by using a glass container with a stirrer and an air pump, wherein the iron-carbon micro-electrolysis materials prepared in the example 1 and the comparative examples 3-5 are respectively added into the glass container, the dosage of the iron-carbon micro-electrolysis materials is 10% of the weight of sewage, the sewage enters the micro-electrolysis reactor and is simultaneously stirred at a low speed by using the stirrer, the air is introduced by using the air pump, the air flow is 750mL/min, the micro-electrolysis reactor added with the iron-carbon micro-electrolysis material prepared in the example 1 is found to operate stably after the reaction is stopped for 30d, no material hardening phenomenon is seen in the process of treating rural sewage for a long time, and the iron-carbon micro-electrolysis materials prepared in the added comparative examples 3-5 are hardened to different degrees, wherein the severity of hardening is 4 > comparative example 5 > comparative example 3.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for treating rural domestic sewage is characterized in that the sewage enters a micro-electrolysis reactor after larger suspended matters are removed through a grid, enters an MABR reactor after micro-electrolysis treatment, is treated again in the MABR reactor, and is subjected to standing precipitation after yielding water, and clear liquid is separated;
the micro-electrolysis reactor contains an iron-carbon micro-electrolysis material, and the iron-carbon micro-electrolysis material is prepared from the following raw materials in parts by weight:
20-30 parts of coal tar pitch, 40-60 parts of iron powder, 3-5 parts of Lewis acid catalyst, 5-10 parts of cobalt powder, 1-5 parts of basalt fiber, 5-10 parts of binder and 3-6 parts of pore-forming agent.
2. The method for treating rural domestic sewage according to claim 1, wherein the membrane carrier of the MABR reactor is a PVDF hollow fiber membrane.
3. The method for treating rural domestic sewage according to claim 2, wherein the membrane pore diameter of the PVDF hollow fiber membrane is 0.15 to 0.25 μm.
4. The method for treating rural domestic sewage according to claim 2, wherein the membrane carrier has microorganisms attached thereto.
5. The method for treating rural domestic sewage according to claim 2, wherein the microorganism comprises Issatchenkia orientalis and Bacillus subtilis.
6. The method for treating rural domestic sewage according to claim 1, wherein the Lewis acid catalyst is AlCl 3 、BF 3 、SbCl 3 、FeBr 3 、FeCl 3 、SnCl 3 、TiCl 3 、ZnCl 2 Any one or more combinations thereof.
7. The method for treating rural domestic sewage according to claim 1, wherein the binder is bentonite and/or dolomite.
8. The method for treating rural domestic sewage according to claim 1, wherein the pore-forming agent is micro-carbonized starch.
9. The method for treating rural domestic sewage according to claim 8, wherein the preparation method of the micro-carbonized starch comprises the following steps:
dissolving soluble starch in water, heating and stirring to form transparent solution, transferring the solution into a hydrothermal reaction kettle, sealing and heating to 185-205 ℃ for reaction for 60-120min, cooling to normal temperature after the reaction is finished, filtering out precipitate, washing and drying.
10. The method for treating rural domestic sewage according to claim 1, wherein the method for preparing the iron-carbon micro-electrolysis material comprises the following steps:
mixing coal pitch, iron powder, lewis acid catalyst, cobalt powder, basalt fiber, binder and pore-forming agent uniformly, mixing with a proper amount of water, granulating, drying the obtained granules, transferring into a crucible, sealing, transferring into a muffle furnace, roasting at 600-800 ℃ for 3-6h, and naturally cooling.
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| CN202311786036.2A CN117534256A (en) | 2023-12-22 | 2023-12-22 | Rural domestic sewage treatment method |
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| CN202311786036.2A CN117534256A (en) | 2023-12-22 | 2023-12-22 | Rural domestic sewage treatment method |
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