CN111675427A - Rural domestic sewage treatment system - Google Patents
Rural domestic sewage treatment system Download PDFInfo
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- CN111675427A CN111675427A CN202010506998.8A CN202010506998A CN111675427A CN 111675427 A CN111675427 A CN 111675427A CN 202010506998 A CN202010506998 A CN 202010506998A CN 111675427 A CN111675427 A CN 111675427A
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- anaerobic
- electric
- electric flocculation
- sewage treatment
- domestic sewage
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- 239000010865 sewage Substances 0.000 title claims abstract description 89
- 238000005189 flocculation Methods 0.000 claims abstract description 98
- 230000016615 flocculation Effects 0.000 claims abstract description 96
- 239000000945 filler Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 63
- 238000005192 partition Methods 0.000 claims description 37
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- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 239000011574 phosphorus Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 27
- 239000010410 layer Substances 0.000 description 18
- 238000002474 experimental method Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000009297 electrocoagulation Methods 0.000 description 7
- 238000012856 packing Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 5
- 229910001447 ferric ion Inorganic materials 0.000 description 5
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- 231100000719 pollutant Toxicity 0.000 description 5
- 230000008569 process Effects 0.000 description 5
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 4
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
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- 150000004692 metal hydroxides Chemical class 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
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- 230000002195 synergetic effect Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000383620 Allium mongolicum Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 240000001398 Typha domingensis Species 0.000 description 1
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- JJLJMEJHUUYSSY-UHFFFAOYSA-L copper(II) hydroxide Inorganic materials [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 1
- AEJIMXVJZFYIHN-UHFFFAOYSA-N copper;dihydrate Chemical compound O.O.[Cu] AEJIMXVJZFYIHN-UHFFFAOYSA-N 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001463 metal phosphate Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021508 nickel(II) hydroxide Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
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- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Images
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
-
- 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
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower or fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
-
- 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
- C02F3/005—Combined electrochemical biological processes
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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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)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a rural domestic sewage treatment system, which comprises a grid pond, an adjusting pond, an electric flocculation anaerobic integrated device and an artificial wetland, wherein the grid pond is connected with the adjusting pond; the grid pond, the adjusting pond, the electric flocculation anaerobic integrated equipment and the constructed wetland are connected in sequence; the electric flocculation anaerobic integrated equipment is provided with an electric flocculation area and an anaerobic area; an electric flocculator is arranged in the electric flocculation area, and a filler is filled in the anaerobic area. The method combines an electric flocculator and an anaerobic treatment, and the electric flocculator is used for removing heavy metal, phosphorus, COD and CN in the sewage‑The operation load of anaerobic treatment and constructed wetland is reduced, ammonia nitrogen in sewage can be effectively removed, and the treatment efficiency and standard reaching rate of sewage treatment are improved.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a rural domestic sewage treatment system.
Background
A great deal of domestic sewage in rural areas is discharged randomly without being treated, and becomes one of the main reasons for eutrophication of lakes and rivers. At present, rural domestic sewage treatment processes are of two types, namely, dynamic sewage treatment, such as a trickling filter and constructed wetland combined process, has good and stable pollutant removal effect, but is complex in management and high in maintenance and operation cost, and cannot adapt to the current situation of weak technical strength in rural areas. And secondly, unpowered anaerobic treatment and artificial wetland treatment are combined, for example, Chinese patent CN106938880A discloses a combined rural domestic sewage treatment system, which adopts a grid pond, an anaerobic pond and a combined artificial wetland system to realize treatment of rural domestic sewage, and the industrial mode management is relatively simple and low in operating cost, but because anaerobic organisms grow and reproduce slowly, the equipment starts and the treatment time is long, and the removal rate of ammonia nitrogen in the anaerobic pond is low, the rural domestic sewage treatment efficiency is low, and the standard reaching performance is poor.
Disclosure of Invention
The invention aims to: aiming at the problems of low ammonia nitrogen removal rate and poor sewage treatment standard-reaching performance of the rural domestic sewage treatment system in the prior art, the rural domestic sewage treatment system is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a rural domestic sewage treatment system comprises a grating tank, a regulating tank, an electric flocculation anaerobic integrated device and an artificial wetland; the grid pond, the adjusting pond, the electric flocculation anaerobic integrated equipment and the constructed wetland are connected in sequence; the electric flocculation integrated equipment comprises a straight tank body and a plurality of partition plates arranged in the tank body;
the plurality of partition plates are arranged along the axial direction of the straight tank body in a staggered manner, and the internal space of the straight tank body is divided into spaces distributed in a snake shape;
an electric flocculation area and an anaerobic area are sequentially arranged in the straight tank body; an electric flocculator is arranged in the electric flocculation area, and a filler loaded with anaerobic flora is filled in the anaerobic area;
the volume ratio of the electric flocculation zone to the anaerobic zone is 1: 3-1: 10.
The invention firstly removes heavy metal ions in sewage in a metal hydroxide precipitation way by utilizing electric flocculation through a mode of combining unpowered electric flocculation with anaerobic treatment, and simultaneously metal hydroxide generated by an electric flocculation polar plate has strong activity and can be coagulated with organic matters and inorganic impurities in water to generate colloid,removing suspended matters in the sewage; the phosphorus in the sewage is removed in the mode of metal phosphate, and meanwhile, the nascent oxygen generated by the anode has strong oxidizing capability and can oxidize organic or inorganic compounds in the sewage to remove COD (chemical oxygen demand) in the sewage and CN (carbon nitride) in the sewage-Removing CN in the sewage-. After the electric flocculation treatment, the operation load of an anaerobic process and the artificial wetland is effectively reduced, so that the whole system can effectively remove ammonia nitrogen in sewage, and the treatment efficiency and the standard reaching rate of sewage treatment are improved.
Adopt electric flocculation and anaerobism integration equipment to make the timely anaerobic treatment that enters into of sewage after the electric flocculation treatment, avoid the pipe connection between electric flocculation and the anaerobism, avoid sewage at the condition of pipeline deposit gathering, do benefit to anaerobic treatment's efficiency. Through the mode that adopts the straight type jar of body, with the mode that the straight type jar body further adopted ground to bury, electric flocculation reaction and anaerobic reaction all go on at the internal jar, keep apart with external, have guaranteed reaction condition's stability and have avoided revealing. Through using the baffle with straight type jar body straggly to arrange, split into the space that snakelike was arranged with jar internal space, increased the residence time of sewage in integrated equipment, do benefit to anaerobic treatment.
When the volume ratio of the electric flocculation zone to the anaerobic zone is 1: 3-1: 10, the electric flocculation treatment efficiency and the anaerobic treatment time reach a balanced state. The overall volume of the straight tank body determines the overall treatment efficiency. When the volume of straight type jar of body is definite, the holistic treatment effeciency is influenced in the proportion in electric flocculation district and anaerobic zone, and in order to keep electric flocculation efficiency when the proportion undersize in electric flocculation district, promote electric flocculation's power, the difficult sediment of mud of production, partial mud enters into anaerobic zone and causes the influence to anaerobic reaction. And the concentration difference between the sewage to be treated and the treated sewage is overlarge, and when the space in the electric flocculation area is too small, the sewage to be treated and the treated sewage are mixed with each other, so that the electric flocculation is not facilitated. When the proportion of the electric flocculation area is too large, although the treatment of the electric flocculation area is more sufficient, the volume of the anaerobic area is reduced, the unit load of the anaerobic area is increased, and the integral treatment efficiency is not kept favorably.
The ratio of the electric flocculation zone to the anaerobic zone is preferably 1: 4-1: 5. In the proportion, the device is more suitable for the water quality of rural domestic sewage, can fully play the synergistic effect of the electric flocculation area and the anaerobic treatment, and has better treatment effect.
The main reactions of the electric flocculation to remove various pollutants in the wastewater are as follows:
1. removal of heavy metal ions
Heavy metal ions and OH generated by electrolyzed water-A metal hydroxide precipitate is formed.
Cu2++2OH-→Cu(OH)2↓；Ni2++2OH-→Ni(OH)2↓
Cd2++2OH-→Cd(OH)2↓；Zn2++2OH-→Zn(OH)2↓
2. Electroflocculation phosphorous removal
Fe precipitated by electrochemical action of iron polar plate2+React with oxygen to form Fe3+And the ferric ions and the phosphate radical react to generate precipitates, so that the effect of removing phosphorus is achieved.
Fe3++PO4 3-→FePO4↓
3. Removing COD and CN-
The anode plate mainly reacts:
Fe–2e→Fe2+；4OH-+4e→2H2O+2O→2H2O+O2↑
the nascent oxygen generated by the anode has strong oxidizing ability, and can oxidize organic or inorganic compounds in water to remove COD in the water. Nascent oxygen as oxidant, oxidizing CN-To connect CN-And (5) removing.
CN-+2OH--2e→CNO-+H2O↑；2CNO-+4OH--6e→2CO2+N2+2H2O↑
4. Removing suspended matters
Dissolving Fe on anode of metal polar plate2+React with oxygen to form Fe3+Production of Fe (OH)3And (4) precipitating.
Fe2++2OH-→Fe(OH)2↓；4Fe(OH)2+O2+2H2O→4Fe(OH)3↓
Fe (OH) produced by the above reaction3The flocculant has strong activity, can be coagulated with organic matters and inorganic impurities in water to generate colloidal plume so as to remove suspended matters in wastewater, and has better removal effect than aluminum salt and iron salt coagulants.
5. Removal of Cr6+
The reduction reaction occurs on the cathode to produce hydrogen molecules. 2H++2e→2H→H2↑
The nascent hydrogen has strong reducing capability, reduces hexavalent chromium into trivalent chromium, and is removed by precipitation in the form of chromium hydroxide.
Cr2O7 2-+6e+14H+→2Cr3++7H2O；CrO4 2-+3e+8H+→Cr3++4H2O
Cr3++3OH-→Cr(OH)3↓；Fe3++3OH-→Fe(OH)3↓
As the preferred scheme of the invention, the tank body consists of a straight cylinder body, a front seal head and a rear seal head; the front end enclosure and the rear end enclosure are plugged at two ends of the straight cylinder body;
the partition plates comprise a lower partition plate and an upper partition plate, and the lower partition plate and the upper partition plate are sequentially far away from the front seal head;
an electric flocculation area is arranged between the lower clapboard and the front end socket, and the electric flocculator is positioned in the electric flocculation area; an anaerobic zone is arranged between the lower clapboard and the upper clapboard;
the front end enclosure is provided with a first water inlet, and the rear end enclosure is provided with a first water outlet; the first water inlet is connected with the water outlet of the regulating tank, and the first water outlet is connected with the water inlet of the artificial wetland.
The tank body is divided into the electric flocculation area and the anaerobic area by the lower partition plate and the upper partition plate, so that sewage subjected to electric flocculation treatment enters the anaerobic area from the upper part of the electric flocculation area, and the influence of electric flocculation precipitation on the anaerobic area is avoided; sewage permeates downwards in the anaerobic zone, timely anaerobic treatment is realized, and the sewage overflows upwards from the space between the upper partition plate and the rear end enclosure, so that the sewage is ensured to be fully contacted with fillers in the anaerobic zone, and the treatment efficiency of the whole equipment is improved.
After floaters and bulky solid pollutants in sewage are removed through the grating tank, the sewage enters the electric flocculation anaerobic integrated treatment equipment after the buffer load of water quality is adjusted through the regulating tank, the sewage after the electric flocculation treatment enters the anaerobic zone through an opening between the upper part of the lower partition plate and the tank body, after the anaerobic treatment, the sewage leaves the anaerobic zone through an outlet between the lower part of the upper partition plate and the tank body, the sewage leaves the integrated treatment equipment through a water outlet arranged on the upper part of the rear end enclosure, the sewage enters the artificial wetland, the sewage is further treated through the artificial wetland, and water meeting the standard is obtained. In the integrated treatment equipment, sewage flows from top to bottom in the anaerobic zone, and the sewage is fully contacted with the filler, so that the treatment effect is better.
As a preferred scheme of the invention, the top of the straight cylinder body is provided with a first maintenance port and a second maintenance port; the first maintenance port is located above the electric flocculation zone, and the second maintenance port is located above the anaerobic zone.
The maintenance port is arranged to facilitate sludge cleaning and equipment maintenance.
As a preferable scheme of the invention, in the electric flocculation area, a bearing platform is arranged on the inner side of the straight cylinder body, the bearing platform is used for bearing the electric flocculator, a through wiring hole is arranged on the top wall of the straight cylinder body, and a power line of the electric flocculator is connected with an external power supply after passing through the wiring hole.
Through setting up the bearing platform, make the electric flocculator be located the middle part in electric flocculation district on the one hand, effect that can full play electric flocculator, on the other hand, the mud of production deposits the below to electric flocculator, avoids mud to cause the jam to electric flocculator.
As a preferable scheme of the invention, the first water inlet is communicated with the bottom or the bottom side of the flocculation area.
Through setting up first water inlet in the bottom in flocculation area for the rivers direction in the electric flocculation district is from bottom to top, and sewage and electric flocculation ware contact are more abundant, and electric flocculation effect is better.
As a preferable scheme of the invention, a stirring device is arranged in the electric flocculation area.
The stirring device is matched with the electric flocculator for use, and in the electric flocculation process, the stirring device stirs the wastewater in the electric flocculation area, so that the concentration polarization of the electric flocculator can be eliminated, scales between the polar plates can be cleaned, and the reduction of the electrolysis efficiency of the polar plates caused by the scales can be effectively prevented; can also promote the precipitation of electrocoagulation impurity agglomeration through the stirring, avoid the mud that electrocoagulation produced to enter into the anaerobic zone, influence the treatment effect in anaerobic zone.
In a preferred embodiment of the present invention, the stirring device is a mechanical stirring rod device.
Mechanical stirring rod direct contact water forms the disturbance to the water, forms omnidirectional stirring to whole water body, and the treatment effect is better.
As a preferable scheme of the invention, the system also comprises a solar panel which is connected with the electric flocculator and used for supplying power to the electric flocculator.
Through setting up solar cell panel, utilize solar energy automatic power supply, avoid extra electric wire to lay, more be applicable to the not enough area of power supply condition.
In a preferred embodiment of the present invention, a storage battery is disposed at an output end of the solar cell panel, and the storage battery supplies power to the electric flocculator.
As a preferable scheme of the invention, the electric flocculator comprises a first binding post, a second binding post, a bracket, a plurality of first polar plates and a plurality of second polar plates.
The first polar plates and the second polar plates are alternately arranged at intervals, the first binding posts are connected with the first polar plates, and the second binding posts are connected with the second polar plates; the support is used for supporting the first polar plates and the second polar plates, so that gaps exist between the adjacent polar plates.
Through two sets of polar plates that set up each other at an interval, two terminals are connected respectively to two sets of polar plates, and under the circumstances of circular telegram direct current, a set of polar plate is as the positive pole of electric flocculator, and another group is as the negative pole of electric flocculator. After using a period of time, through changing the power supply connection relation, exchange the positive negative pole of electric flocculator, realize switching electrode, prevent the anodic passivation, improve the electric flocculation effect, avoid using the electric flocculation effect that same fixed direction cycle's power leads to not good.
As a preferable scheme of the invention, the electric flocculator further comprises a controller, and the controller can adjust the positive electrode and negative electrode reversal switching of the electric flocculator power supply according to the resistance increasing rate between the positive electrode plate and the negative electrode plate.
As a preferable scheme of the invention, the artificial wetland comprises five stages of vertical flow wetlands connected in series.
As a preferable scheme of the invention, the artificial wetland comprises an impermeable layer, a cobble layer, a gravel layer, a fine stone layer, a sand layer and a mixed soil layer from bottom to top in sequence.
According to the preferable scheme of the invention, the cobblestone has a diameter of 20-40 mm, the broken stone has a diameter of 10-20 mm, and the fine stone has a diameter of 5-10 mm.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the rural domestic sewage treatment system of the invention adopts the electric flocculation anaerobic integrated equipment, adopts the mode of combining the electric flocculator and the anaerobic treatment, and is matched with a reasonable integrated device to play the comprehensive effect of the electric flocculation and the anaerobic treatment, and the electric flocculator is used for removing heavy metal, phosphorus, COD and CN in the sewage firstly-The operation load of anaerobic treatment and constructed wetland is reduced, ammonia nitrogen in sewage can be effectively removed, and the treatment efficiency and standard reaching rate of sewage treatment are improved.
2. According to the rural domestic sewage treatment system, the integrated equipment is arranged in the tank body, and the electric flocculation area and the anaerobic area are divided by adopting the lower partition plate and the upper partition plate, so that the continuity of sewage treatment is ensured, the stability of reaction conditions is ensured, and the efficiency and the effect of sewage treatment are improved.
3. According to the rural domestic sewage treatment system, the stirring device is arranged to clean dirt of the polar plate, precipitate is promoted, the influence of precipitated sludge on the electric flocculator is avoided through the bearing platform, the water inlet is arranged at the bottom of the electric flocculation area, so that the sewage is in more sufficient contact with the electric flocculator, the effect of the electric flocculator is improved, the negative influence of the sludge generated by electric flocculation on subsequent anaerobic treatment is avoided, and the anaerobic process is favorably exerted.
Drawings
FIG. 1 is a schematic structural diagram of a rural domestic sewage treatment system of the present invention.
FIG. 2 is a schematic view of the structure of an artificial wetland in the rural domestic sewage treatment system of the invention.
FIG. 3 is a structural diagram of the flocculation and anaerobic integrated equipment of the rural domestic sewage treatment system.
FIG. 4 is a schematic view of the electric flocculator structure of the rural domestic sewage treatment system of the present invention.
FIG. 5 is a schematic diagram of the aluminum plate structure of the rural domestic sewage treatment system of the present invention.
Icon: 100-a grating tank; 200-a regulating reservoir; 300-flocculation anaerobic integrated equipment; 400-constructed wetland; 401-barrier layer; 402-cobblestone layer; 403-a rubble layer; 404-a fine stone layer; 405-a sand layer; 406-mixed soil layer; 500-a solar panel;
1-a straight cylinder body; 11-a load-bearing platform; 12-a wiring hole; 21-front end enclosure; 22-rear end enclosure; 23-a first water inlet; 24-a first water outlet; 31-a lower baffle; 32-an upper baffle plate; 301-an electroflocculation zone; 302-anaerobic zone; 4-electric flocculator; 411-a first plate; 4111-connecting hole; 412-a second plate; 421-a first terminal post; 422-a second terminal post; 43-a scaffold; 5-a filler; 51-a first maintenance port; 52-second dimension trim.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A rural domestic sewage treatment system, as shown in fig. 1-3, comprising a grid pond 100, a regulating pond 200, an electrocoagulation-anaerobic integrated device 300 and an artificial wetland 400, and a solar panel 500; the grid pond 100, the adjusting pond 200, the electric flocculation anaerobic integrated equipment 300 and the constructed wetland 400 are connected in sequence;
the electric flocculation anaerobic integrated equipment 300 is provided with an electric flocculation area 301 and an anaerobic area 302; an electric flocculator 4 is arranged in the electric flocculation area 301, and a filler 5 is filled in the anaerobic area 302 and is a biological filler. The solar cell panel 500 is connected with the electric flocculator 4 and is used for supplying power to the electric flocculator 4.
The integrated electric flocculation apparatus 300 further comprises a straight tank body; the straight tank body consists of a straight cylinder body 1, a front end enclosure 21 and a rear end enclosure 22; the front seal head 21 and the rear seal head 22 are plugged at two ends of the straight cylinder body 1; a lower partition plate 31 and an upper partition plate 32 are arranged in the straight cylinder body 1, and the lower partition plate 31 and the upper partition plate 32 are sequentially far away from the front end enclosure 21; the lower partition plate 31 is in an arc shape matched with the inner side of the straight cylinder body 1, and a gap is formed between the upper end of the lower partition plate and the upper side of the inner wall of the straight cylinder body 1; the upper partition plate 32 is in an arc shape matched with the inner side of the straight cylinder body 1, and a gap is formed between the lower end of the upper partition plate and the lower side of the inner wall of the straight cylinder body 1;
an electric flocculation area 301 is arranged between the lower partition plate 31 and the front end socket 21, and the electric flocculator 4 is positioned in the electric flocculation area 301; an anaerobic zone 302 is arranged between the lower partition plate 31 and the upper partition plate 32; the front end enclosure 21 is provided with a first water inlet 23, and the first water inlet 23 is communicated with the bottom of the flocculation zone 301. The rear end enclosure 22 is provided with a first water outlet 24; the first water inlet 23 is connected with the water outlet of the regulating tank 200, and the first water outlet 24 is connected with the water inlet of the artificial wetland 400. The top of the straight cylinder body 1 is provided with a first maintenance port 51 and a second maintenance port 52; the first maintenance port 51 is located above the electric flocculation zone 301, and the second maintenance port 52 is located above the anaerobic zone 302, so that sludge cleaning and equipment maintenance are facilitated.
In the electric flocculation area 301, a bearing platform 11 is arranged on the inner side of the tank body, the bearing platform 11 is used for bearing the electric flocculator 4, a through wiring hole 12 is arranged on the top wall of the tank body, and a wiring terminal of the electric flocculator 4 penetrates through the wiring hole 12 and then is connected with an external power supply. A mechanical stirring rod device is arranged in the electric flocculation area 301.
As shown in fig. 4 and 5, the electric flocculator 4 includes a first terminal 421, a second terminal 422, a support 43, a plurality of first plates 411 and a plurality of second plates 412; the plurality of first electrode plates 411 and the plurality of second electrode plates 412 are alternately arranged at intervals. A connecting hole 4111 is formed in each first pole plate 411, and the first terminal 421 passes through the connecting hole 4111 of each first pole plate 411 to be connected with the plurality of first pole plates 411; in the same manner, the second terminals 422 are connected to the second plates 412; the support 43 is used to support the first plates 411 and the second plates 412, so that a gap exists between adjacent plates.
The electric flocculator also comprises a controller which is an intelligent switching electrode controller and can adjust the positive and negative reversal switching of the electric flocculator power supply according to the resistance increasing rate between the positive and negative electrode plates. Namely, the scheme of the Chinese patent CN103771566B 'a method for automatically reversing the power polarity of an electric flocculation device' in the past of the applicant is adopted.
The artificial wetland 400 comprises five stages of vertical flow wetland in series. The artificial wetland 400 comprises an impermeable layer 401, a cobblestone layer 402, a rubble layer 403, a fine stone layer 404, a sand layer 405 and a mixed soil layer 406 from bottom to top in sequence. The cobblestone is 20-40 mm in diameter, the broken stone is 10-20 mm in diameter, and the fine stone is 5-10 mm in diameter.
Test example 1
To verify the mutual influence of the electric flocculation and the anaerobic treatment, preliminary experiments of the electric flocculation and the anaerobic treatment were performed using a small-sized experimental apparatus. The experimental facility comprises an electric flocculation test chamber and an anaerobic test chamber. The experimental protocol was as follows:
experiment 1, only adopting an anaerobic test chamber, treating sewage to be treated by the anaerobic test chamber, and monitoring parameters of a treated water sample; the anaerobic treatment time was 6 hours.
Experiment 3, the electroflocculation test chamber and the anaerobic test chamber were installed in an experimental tank and arranged as in example 1; and monitoring the parameters of the water sample treated by the integrated simulation equipment. The anaerobic treatment time was 6 hours. The experiment adopts a water sample of a certain residential area, the water quality is as follows,
TABLE 1 quality of wastewater influent
| Item | CODcr | BOD5 | SS | NH3-N | TN | TP |
| Quality of inlet water (mg/L) | 300 | 150 | 180 | 25 | 35 | 5 |
The experimental results are as follows:
TABLE 2 Effect of different treatment Processes on Water quality
| Item | CODcr | BOD5 | SS | NH3-N | TN | TP |
| Experiment 1(mg/L) | 76 | 19 | 56 | 9 | 25 | 3 |
| Experiment 2(mg/L) | 55 | 13 | 16 | 10 | 18 | 0.9 |
| Experiment 3(mg/L) | 50 | 10 | 10 | 5 | 15 | 0.5 |
From the above experimental results, it can be seen that the results of the experiment 2 and experiment 3, in which the CODcr was reduced to 55 and 50, respectively, were significantly better than the result of 76 in experiment 1, and the sewage treatment effect was significantly better after the electric flocculation treatment was added. After the electric flocculation treatment, the SS and TP in the sewage are obviously reduced, the load of anaerobic treatment is reduced, and the anaerobic treatment is facilitated.
Compared with the effect of treating sewage in a single serial mode adopted in the experiment 2, the effect of adopting integrated equipment in the experiment 3 reduces CODcr from 55 to 50 and by 10%. The anaerobic treatment effect is obviously better. The sewage treatment effect is better by adopting the electric flocculation anaerobic integrated equipment.
Test example 2
Influence of the ratio of the electrocoagulation zone to the anaerobic zone
A rectangular electrolytic tank with 200mm multiplied by 200mm in section and 2000mm in length and an upper opening is used as an experimental tank body; the experimental tank body is divided into an electric flocculation area and an anaerobic area by two clapboards.
The power supply parameters were 60V, 100A. The plate specification is 100mm 2mm, 10 blocks each of aluminium plate and iron plate. The stirring speed of the stirring device is 30 revolutions per minute.
Keeping the power of the electric flocculation zone unchanged, and adjusting the position of the partition plate to change the ratio of the electric flocculation zone to the anaerobic zone between 15:185 and 80: 120. Injecting the experimental sewage with the specification of table 1 into the electric flocculation area, and detecting the water quality of the water outlet of the anaerobic area after 1 h.
TABLE 3 Effect of the ratio of the electrocoagulation zone and the anaerobic zone on Water quality
| Ratio of | CODcr | BOD5 | SS | NH3-N | TN | TP |
| 15:185 | 90 | 20 | 18 | 10 | 24 | 1 |
| 20:180 | 85 | 16 | 16 | 8 | 18 | 0.8 |
| 30:170 | 78 | 14 | 16 | 8 | 17 | 0.8 |
| 40:160 | 72 | 13 | 10 | 6 | 14 | 0.9 |
| 50:150 | 73 | 15 | 10 | 6 | 15 | 0.9 |
| 60:140 | 76 | 16 | 12 | 7 | 16 | 0.8 |
| 80:120 | 76 | 16 | 12 | 7 | 16 | 0.8 |
From the above experimental results, it was found that, when the volume of the electrolytic bath is constant, the CODcr value of the treated sewage tends to decrease first and then increase gradually as the ratio of the electrocoagulation zone to the anaerobic zone increases. When the ratio is more than 20:180, the treatment effect is better, and when the ratio exceeds 50:150, the treatment effect tends to be gentle, because the saturated amount of anaerobic treatment is not reached, and in consideration of the problem of space occupation of equipment, the treatment effect on sewage is better when the ratio of the electric flocculation zone to the anaerobic zone is in the range of 20:180 to 50:150, namely, the ratio is 1:3 to 1: 10. When the volume ratio of the electric flocculation area to the anaerobic area is 40:160, namely 1:4, the effect is optimal, and the proportion of the anaerobic area is increased as much as possible in consideration of long-term use, so that the electric flocculation area and the anaerobic area are more suitable for the water quality of rural domestic sewage when the proportion is 1:4 to 1:5, and the synergistic effect of the electric flocculation area and the anaerobic area can be fully played.
Example 2
The embodiment is a processing system constructed according to specific situations of a certain residential area in a certain rural area. The residential area has 100 households, wherein the average number of each household is 3.5, the total number of people is 350, the daily water consumption is 170L/person/day, the domestic sewage discharge amount is calculated by 80 percent of the water consumption, and the daily sewage discharge amount is 47.6m3. According to the daily treatment capacity of 50m3Design considerations are made. The main water quality indexes of domestic sewage are as follows:
TABLE 4 quality of wastewater influent
The effluent quality is according to the first class A standard in the discharge Standard of pollutants for municipal wastewater treatment plants (GB18918-2002), and specific effluent quality indexes are shown in the following table:
TABLE 5 effluent quality Standard of Sewage treatment plant
Note: the numerical value outside the brackets is the control index when the water temperature is more than or equal to 12 ℃, and the numerical value inside the brackets is the control index when the water temperature is less than or equal to 12 ℃.
According to the natural and treatment conditions, the main components of the rural domestic sewage treatment system are arranged in the following way:
1. grid pool
Residence time: 60 minutes; effective volume: 2.5m3；
Size: 3000X 1000X 1200 mm;
a built-in grid: the grid gap is 20 mm; the structural form is as follows: a steel concrete structure.
2. A regulating pool:
residence time: 8 hours; effective volume: 20m3；
Size: 3000 multiplied by 3000 mm;
the structural form is as follows: steel concrete structure
3. Buried electric flocculation anaerobic integrated equipment
Processing capacity: 50m3/d；
Equipment size: phi 2000X 9500mm
An electrolytic anaerobic zone and a settling zone are arranged inside. The anaerobic retention time is 6 hours, and the inside is provided with a three-dimensional elastic biological filler. The electrolytic power is not less than 1KW, and a solar battery is adopted for power supply.
4. Artificial wet land
4.1 effective area (F) calculation of artificial wetland bed: by design load
L＝0.5m3/m2Day of the day
F＝50/0.5＝100m2
4.2 adopt the vertical flow wetland bed, for five grades of series connection, its plane size:
6m×17m＝(6×3.4)×5＝102m2
because the wall thickness of the periphery is 30cm without the cover plate, the thickness of the separating wall is 20cm, the first-stage wetland bed is delivered to the diversion canal for water distribution at the bottom by the buried sewage treatment equipment by 24cm, and the actual occupied area and the area of the artificial wetland bed are 18.4 × 6.6.6-121.44 m2。
4.3 the effective height of the filler of the first-stage bed of the artificial wetland is 80cm, and 3cm of stone chips or coal chips are paved on the surface layer. The effective height of the second-stage wetland bed is 78cm, and 3cm of stone chips or coal chips are paved on the surface layer. The effective height of the third-stage wetland bed is 76cm, and 3cm of stone chips or coal chips are paved on the surface layer. The effective height of the four-stage wet land bed is 74cm, and 3cm of stone chips or coal chips are paved on the surface layer. The effective height of the five-stage wetland bed is 72cm, and 3cm of stone chips or coal chips are paved on the surface layer.
First grade wetland bed packing particle size
The thickness is 80cm +3 cm;
second grade wetland bed packing particle size
The thickness is 78cm +3 cm;
three-stage wetland bed packing particle size
The thickness is 76cm +3 cm;
four-stage wetland bed packing particle size
The thickness is 74cm +3 cm;
five-grade wetland bed packing particle size
The thickness is 72cm +3 cm;
the first, second, third and fourth grade wetland bed packing is made of limestone or building crushed stone and broken bricks, and the fifth grade wetland bed packing is made of sand.
Each grade wetland bed underflow water level is 2cm lower than the previous grade wetland bed, then effective volume of wetland bed:
V＝102m2×[(0.8+0.76+0.74+0.72)÷5]＝102m2×0.76m＝77.52m3
total runoff time t of the purified water in the artificial wetland bed is 77.52m3/50m3Day 1.55 (× 24 h 37.2 h/day)
4.4 Water distribution method of artificial wetland bed:
if the first stage flows upwards from the bottom of the bed, water is distributed by partition wall lattice holes. If the first stage wetland bed adopts downward flow, a water distribution weir method is adopted. In any case, in the lattice holes10cm section pavement of water distribution surface of water distribution weir
The gravel or crushed stones make the water flow to the cross section of the wetland bed uniformly. The effluent of the last stage wetland bed is collected by tooth grooves (made of plastic plates) and discharged by a DN200mm plastic pipe.
4.5 the difference between the surface level of the artificial wetland bed filler and the ground is estimated to be 70cm, the total volume Vtotal of the artificial wetland bed is 18.4 × 6.6.6 6.6 × 1.5.5 is 182.16m3。
4.6 planting of artificial wetland bed plants: emergent aquatic plants with large nitrogen and phosphorus absorption amount, such as reed, cattail, allium mongolicum and local vegetation, are mainly planted, and the average planting density is about 4 plants/m2。
According to the scheme, after the domestic sewage is treated, the water quality condition is continuously monitored, and the record is as follows:
TABLE 6 record of sewage treatment
The treated domestic sewage meets the first class A standard in the discharge Standard of pollutants for municipal wastewater treatment plant (GB 18918-2002).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A rural domestic sewage treatment system is characterized by comprising a grating tank (100), a regulating tank (200), an electric flocculation anaerobic integrated device (300) and an artificial wetland (400); the grid pond (100), the adjusting pond (200), the electric flocculation anaerobic integrated equipment (300) and the constructed wetland (400) are connected in sequence;
the electric flocculation integrated equipment (300) comprises a straight tank body and a plurality of partition plates arranged in the tank body;
the plurality of partition plates are arranged along the axial direction of the straight tank body in a staggered manner, and the internal space of the straight tank body is divided into spaces distributed in a snake shape;
an electric flocculation zone (301) and an anaerobic zone (302) are sequentially arranged in the straight tank body; an electric flocculator (4) is arranged in the electric flocculation area (301), and a filler (5) loaded with anaerobic flora is filled in the anaerobic area (302);
the volume ratio of the electric flocculation zone (301) to the anaerobic zone (302) is 1: 3-1: 10.
2. The rural domestic sewage treatment system of claim 1, wherein the tank body is composed of a straight cylinder body (1), a front end enclosure (21) and a rear end enclosure (22); the front seal head (21) and the rear seal head (22) are plugged at two ends of the straight cylinder body (1);
the partition plates comprise a lower partition plate (31) and an upper partition plate (32), and the lower partition plate (31) and the upper partition plate (32) are sequentially far away from the front seal head (21);
an electric flocculation zone (301) is arranged between the lower partition plate (31) and the front seal head (21), and an anaerobic zone (302) is arranged between the lower partition plate (31) and the upper partition plate (32);
the front seal head (21) is provided with a first water inlet (23), and the rear seal head (22) is provided with a first water outlet (24); the first water inlet (23) is connected with the water outlet of the regulating tank (200), and the first water outlet (24) is connected with the water inlet of the artificial wetland (400).
3. The rural domestic sewage treatment system according to claim 2, wherein the top of the straight cylinder body (1) is provided with a first maintenance port (51) and a second maintenance port (52); the first maintenance opening (51) is positioned above the electric flocculation zone (301), and the second maintenance opening (52) is positioned above the anaerobic zone (302).
4. The rural domestic sewage treatment system according to claim 2, wherein in the electric flocculation area (301), a bearing platform (11) is arranged inside the straight cylinder body (1), the bearing platform (11) is used for bearing the electric flocculator (4), a wire connection hole (12) is arranged on the top wall of the straight cylinder body (1) in a penetrating way, and a power wire of the electric flocculator (4) passes through the wire connection hole (12) and then is connected with an external power supply.
5. The rural domestic sewage treatment system of claim 2, wherein the first water inlet (12) communicates with the bottom or bottom side of the flocculation zone (301).
6. The rural domestic sewage treatment system of claim 1, wherein a stirring device is arranged in the electric flocculation area (301).
7. The rural domestic sewage treatment system according to claim 1, further comprising a solar panel (500), wherein the solar panel (500) is connected with the electric flocculator (4) for supplying power to the electric flocculator (4).
8. The rural domestic sewage treatment system according to claim 1, wherein the electric flocculator (4) comprises a first terminal (421), a second terminal (422), a bracket (43), a number of first plates (411) and a number of second plates (412);
the plurality of first pole plates (411) and the plurality of second pole plates (412) are alternately arranged at intervals, the first binding post (421) is connected with the plurality of first pole plates (411), and the second binding post (422) is connected with the plurality of second pole plates (412); the support (43) is used for supporting the plurality of first polar plates (411) and the plurality of second polar plates (412) so that gaps exist between the adjacent polar plates.
9. The rural domestic sewage treatment system according to any one of claims 1-8, wherein the artificial wetland (400) comprises an impermeable layer (401), a cobblestone layer (402), a gravel layer (403), a fine stone layer (404), a sand layer (405) and a mixed soil layer (406) from bottom to top in sequence.
10. The rural domestic sewage treatment system of claim 9, wherein the cobblestones have a diameter of 20-40 mm, the crushed stones have a diameter of 10-20 mm, and the fine stones have a diameter of 5-10 mm.
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| CN114538574A (en) * | 2022-01-24 | 2022-05-27 | 中国计量大学 | Low-energy-consumption electric flocculation method for cooperatively removing phosphorus and heavy metals in printing and dyeing wastewater |
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