CN113493249A - Method for treating escherichia coli in tail water of sewage plant - Google Patents
Method for treating escherichia coli in tail water of sewage plant Download PDFInfo
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- CN113493249A CN113493249A CN202110633335.7A CN202110633335A CN113493249A CN 113493249 A CN113493249 A CN 113493249A CN 202110633335 A CN202110633335 A CN 202110633335A CN 113493249 A CN113493249 A CN 113493249A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000010865 sewage Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 26
- 241000588724 Escherichia coli Species 0.000 title claims abstract description 25
- 238000009301 bioretention Methods 0.000 claims abstract description 41
- 241000233866 Fungi Species 0.000 claims abstract description 25
- 239000000945 filler Substances 0.000 claims abstract description 17
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003830 anthracite Substances 0.000 claims abstract description 15
- 241000196324 Embryophyta Species 0.000 claims description 88
- 230000014759 maintenance of location Effects 0.000 claims description 23
- 235000005273 Canna coccinea Nutrition 0.000 claims description 22
- 239000002351 wastewater Substances 0.000 claims description 10
- 230000002572 peristaltic effect Effects 0.000 claims description 5
- 244000205574 Acorus calamus Species 0.000 claims description 3
- 241000383620 Allium mongolicum Species 0.000 claims description 3
- 235000011996 Calamus deerratus Nutrition 0.000 claims description 3
- 244000292211 Canna coccinea Species 0.000 claims description 3
- 235000007849 Lepidium sativum Nutrition 0.000 claims description 3
- 244000211187 Lepidium sativum Species 0.000 claims description 3
- 241000209082 Lolium Species 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
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- 241000896533 Gliocladium Species 0.000 claims 2
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- 241000746966 Zizania Species 0.000 claims 1
- 235000002636 Zizania aquatica Nutrition 0.000 claims 1
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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
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
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Abstract
The invention relates to a method for treating escherichia coli in tail water of a sewage plant, which is characterized in that the tail water of the sewage plant is introduced into a bioretention pond, and anthracite is filled in the bioretention pond as a filler; inoculating arbuscular mycorrhizal fungi into aquatic plants in seedling stage, and constructing an arbuscular mycorrhizal fungi-aquatic plant symbiotic system; the arbuscular mycorrhizal fungi-aquatic plant symbiotic system is planted in the bioretention pond. The invention adopts a mode of combining physical action and biological action to intercept and eliminate escherichia coli in sewage.
Description
Technical Field
The invention relates to the technical field of tail water treatment of sewage plants, in particular to a method for treating escherichia coli in tail water of a sewage plant.
Background
With the rapid development of economy and the rapid increase of population, the water demand of China is continuously enlarged, the urbanization process is accelerated, the water burden of partial areas is aggravated, and the total amount of water resources is limited to a certain extent by water environment pollution. . The sewage is subjected to biochemical treatment, residual pollutants and pathogenic microorganisms in the effluent are further removed, the effluent reaches the reuse water standard, and the effluent can be directly or indirectly reused for daily life production and municipal miscellaneous use.
Chlorination is the most common method of disinfection in feedwater treatment and sewage treatment. However, during the disinfection process, halogen elements (mainly chlorine) react with some Natural Organic Matters (NOMs) in water to generate some substances which are harmful to the environment and human body, and are called disinfection byproducts, and the currently identified main disinfection byproducts are: trihalomethane, haloacetic acid, haloacetonitrile, etc., which are extremely carcinogenic, teratogenic, mutagenic.
The environmental health risks posed by the disinfection by-products are of increasing concern. When the disinfected reclaimed water is used as living miscellaneous water, municipal water, landscape water or enters a natural water body through other ways, disinfection byproducts can cause potential harm to human health and organisms in the received water body.
In the prior art, researches show that the adoption of deposition is the most main way for removing pathogenic microorganisms, so that the scheme of replacing chlorine disinfection by an ecological treatment method has important practical significance.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of overcoming the harm of chlorination disinfection on disinfection byproducts generated after sewage treatment in the prior art, and provides an ecological treatment method which can replace chlorination disinfection.
In order to solve the technical problem, the invention provides a method for treating escherichia coli in tail water of a sewage plant, wherein the tail water of the sewage plant is introduced into a bioretention pond, and anthracite is filled in the bioretention pond as a filler; inoculating arbuscular mycorrhizal fungi into aquatic plants in seedling stage, and constructing an arbuscular mycorrhizal fungi-aquatic plant symbiotic system; the arbuscular mycorrhizal fungi-aquatic plant symbiotic system is planted in the bioretention pond.
In one embodiment of the invention, the period of cultivation is not less than 60 days after inoculation of the arbuscular mycorrhizal fungi into the aquatic plant at seedling stage.
In one embodiment of the present invention, the roots of the aquatic plant are sterilized before the arbuscular mycorrhizal fungi are inoculated to the aquatic plant at the seedling stage.
In one embodiment of the invention, the arbuscular mycorrhizal fungus comprises comycosphaera, glomus intraradicalis, or glomus mosseae.
In one embodiment of the invention, the aquatic plant is selected from one or more of reed, cattail, allium mongolicum regel, rush, cress, cane shoot, calamus, droughhaired bevel herb, canna indica and ryegrass.
In one embodiment of the invention, the hydraulic retention time of the sewage plant tail water in the bioretention tank is 1 day to 3 days.
In one embodiment of the invention, the bioretention pond comprises a descending pond and an ascending pond which are arranged in a separated mode, water passing spaces are arranged at the bottoms of the descending pond and the ascending pond, a water feeding pipeline is arranged above the descending pond, a drainage pipeline is arranged above the ascending pond, tail water of a sewage plant flows into the descending pond from the water feeding pipeline, flows downwards in the descending pond, flows into the ascending pond from the water passing space at the bottom, flows upwards in the ascending pond and finally flows out from the drainage pipeline.
In one embodiment of the invention, the anthracite coal in the bioretention tank has a diameter of 3.0mm to 5.0 mm.
In one embodiment of the invention, a peristaltic metering pump is arranged on a water supply pipeline of the biological retention tank, and tail water of a sewage plant is quantitatively discharged into the biological retention tank through the peristaltic metering pump.
In one embodiment of the invention, the inner wall of the drainage pipeline of the bioretention pond is coated with geotextile.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the method for treating the escherichia coli in the tail water of the sewage plant adopts a mode of combining physical action and biological action to intercept and eliminate the escherichia coli in the sewage;
the physical method is adopted, anthracite in the biological retention tank is used as filler, the filtering, interception and deposition effects are mainly achieved, and large-particle substances can be intercepted by gaps among the filler; meanwhile, in the biological retention tank, sewage flows from the head end to the tail end, pollutants are continuously precipitated, the effect is similar to that of a sedimentation tank, and meanwhile, the anthracite filler can release SO4 2-The effluent is acidic (pH3.2-6.5), so that the environment is not beneficial to the existence of faecal coliform bacteria, and the removal rate of the faecal coliform bacteria can be effectively improved;
by adopting a biological method, the arbuscular mycorrhizal fungi are inoculated to the aquatic plants in the seedling stage to construct an arbuscular mycorrhizal fungi-aquatic plant symbiotic system, and experimental studies show that, on one hand, the arbuscular mycorrhizal fungi can improve the plant height of the aquatic plants and accelerate the growth speed of the plants to achieve the arbuscular mycorrhizal fungi-aquatic plant symbiotic effect, on the other hand, the arbuscular mycorrhizal fungi-aquatic plant symbiotic system can remarkably improve the growth of the roots of the aquatic plants and shows that hyphae outside the roots are abnormally developed, the properties greatly improve the spatial range of the aquatic plants for adsorbing and removing faecal coliform in sewage, the hypha of the arbuscular mycorrhizal fungi can also secrete soil proteins such as saccharycin (GRSP) and the like, the saccharycin can be used as 'super glue' in soil to fix small granular substances such as sand and the like in the soil, meanwhile, good permeability is kept, and the stability of soil aggregates is improved, so that the physicochemical property of the bioretention pond can be changed, the microenvironment of plant rhizosphere is further improved, and the interception effect and the inactivation effect of the bioretention pond are improved.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a flow chart of the method for treating Escherichia coli in wastewater from a sewage plant according to the present invention;
FIG. 2 is a schematic view showing the structure of a bioretention pond of the present invention
FIG. 3 is a bar graph comparing plant heights of canna plants in various bioretention ponds of the present invention;
FIG. 4 is a bar graph comparing root lengths of canna in various bioretention ponds according to the present invention;
FIG. 5 is a bar graph comparing biomass of canna in various bioretention ponds according to the present invention;
FIG. 6 is a line graph comparing the E.coli excretion amounts of group A and group B in the bioretention pond No. 1 of the present invention;
FIG. 7 is a line graph comparing the E.coli excretion amounts of group A and group B in the bioretention pond No. 2 of the present invention;
FIG. 8 is a line graph comparing the E.coli excretion amounts of group A and group B in the bioretention pond No. 3 of the present invention;
the specification reference numbers indicate: 1. a downlink pool; 2. an ascending pool; 3. a water passing space; 4. a water supply pipe; 5. a water discharge pipeline; 6. peristaltic metering pump.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, the method for treating escherichia coli in tail water of a sewage plant of the present invention comprises the following steps: introducing tail water of a sewage plant into a bioretention pond, wherein anthracite is filled in the bioretention pond as a filler; inoculating arbuscular mycorrhizal fungi into aquatic plants in seedling stage, and constructing an arbuscular mycorrhizal fungi-aquatic plant symbiotic system; the arbuscular mycorrhizal fungi-aquatic plant symbiotic system is planted in the bioretention pond.
Specifically, the cultivation period is not less than 60 days after the arbuscular mycorrhizal fungi are inoculated to the aquatic plants at the seedling stage.
Specifically, before the arbuscular mycorrhizal fungi are inoculated to the aquatic plants in the seedling stage, the roots of the aquatic plants need to be sterilized to prevent the seedlings of the aquatic plants from being infected by other fungi.
Specifically, the hydraulic retention time of the tail water of the sewage plant in the biological retention pond is 1 to 3 days.
The method adopts a mode of combining physical action and biological action to intercept and eliminate the escherichia coli in the sewage;
the physical method is adopted, anthracite in the biological retention tank is used as filler, the filtering, interception and deposition effects are mainly achieved, and large-particle substances can be intercepted by gaps among the filler; meanwhile, in the biological retention tank, sewage flows from the head end to the tail end, pollutants are continuously precipitated, the effect is similar to that of a sedimentation tank, and meanwhile, the anthracite filler can release SO4 2-The effluent is acidic (pH3.2-6.5), so that the environment is not beneficial to the survival of faecal coliform group, and the removal rate of faecal coliform group can be effectively improved;
by adopting a biological method, the arbuscular mycorrhizal fungi are inoculated to the aquatic plants in the seedling stage to construct an arbuscular mycorrhizal fungi-aquatic plant symbiotic system, and experimental studies show that, on one hand, the arbuscular mycorrhizal fungi can improve the plant height of the aquatic plants and accelerate the growth speed of the plants to achieve the arbuscular mycorrhizal fungi-aquatic plant symbiotic effect, on the other hand, the arbuscular mycorrhizal fungi-aquatic plant symbiotic system can remarkably improve the growth of the roots of the aquatic plants and shows that hyphae outside the roots are abnormally developed, the properties greatly improve the spatial range of the aquatic plants for adsorbing and removing faecal coliform in sewage, the hypha of the arbuscular mycorrhizal fungi can also secrete soil proteins such as saccharycin (GRSP) and the like, the saccharycin can be used as 'super glue' in soil to fix small granular substances such as sand and the like in the soil, meanwhile, good permeability is kept, and the stability of soil aggregates is improved, so that the physicochemical property of the bioretention pond can be changed, the microenvironment of plant rhizosphere is further improved, and the interception effect and the inactivation effect of the bioretention pond are improved.
Specifically, the common arbuscular mycorrhizal fungi include marsupium molsium, glomus intraradicans or glomus mosseae, and any arbuscular mycorrhizal fungi can be inoculated in the aquatic plants.
Specifically, the aquatic plant can be one or more of reed, cattail, allium mongolicum regel, rush, cress, cane shoot, calamus, dromey parasol, canna indica and ryegrass.
Referring to fig. 2, the bioretention pond comprises a descending pond 1 and an ascending pond 2 which are separately arranged, a water passing space 3 is arranged at the bottom of the descending pond 1 and the ascending pond 2, a water feeding pipeline 4 is arranged above the descending pond 1, a drainage pipeline 5 is arranged above the ascending pond 2, tail water of a sewage plant flows into the descending pond 1 from the water feeding pipeline 4, flows downwards in the descending pond 1, flows into the ascending pond 2 from the water passing space 3 at the bottom, flows upwards in the ascending pond 2, and finally flows out from the drainage pipeline 5.
Specifically, be provided with wriggling measuring pump 6 on the water supply pipe 4 in biological detention pond, through wriggling measuring pump 6 ration is to the biological detention pond tail water of discharging into in the pond of sewage plant, because biological detention pond effective volume and purification rate are certain, and when exhaust sewage surpassed the purification volume, just can't reach purifying effect, consequently need set up wriggling measuring pump and control sewage total volume of intaking.
Specifically, the inner wall of the drainage pipeline 5 of the bioretention pond is coated with geotextile to prevent the filler in the bioretention pond from being discharged from the drainage pipeline 5.
In order to prove the feasibility and the beneficial effect of the method for treating escherichia coli in tail water of a sewage plant, canna is selected as an aquatic plant, mysa mollissima is selected as arbuscular mycorrhizal fungi, the mysa mollissima is inoculated into the canna to form a mysa mollissima-canna symbiotic system, and a simulation experiment is carried out, wherein the specific experimental scheme is as follows:
6 biological retention ponds with the same size are built, the 6 biological retention ponds are divided into A, B two groups (CW1-A, CW2-A, CW3-A, CW1-B, CW2-B, CW3-B), wherein common canna is planted in the A group biological retention pool (CW1-A, CW2-A, CW3-A), and Mucor morusifolia-canna symbiotic system is planted in the B group biological retention pool (CW1-B, CW2-B, CW3-B), and the CW1-A, CW1-B biological detention pond is filled with anthracite filler with the thickness of 0.5-1mm, the CW2-A, CW2-B bioretention pond is filled with anthracite filler with the thickness of 1-2mm, and the CW3-A, CW3-B bioretention pond is filled with anthracite filler with the thickness of 3-5mm to form a comparative experiment group.
The method comprises the following steps of firstly, verifying the feasibility of the Mucor morchelli-canna symbiotic system and the growth condition of the Mucor morchelli-canna symbiotic system under the condition of different filler particle sizes.
Specifically, a Musa meyeriana plant at a seedling stage is inoculated by using a Musca morsi arbuscular mycorrhizal fungi agent to construct a Musca morsi-Musa meyeriana symbiotic system, and after 60 days of culture, the infection rate of Musca morsi (Glomus mossea, GM) reaches about 25%, and the Musca morea can effectively infect the Musca meyeriana.
Referring to fig. 3, the initial plant heights of the selected canna plants are about 16cm, the canna plants in the 6 biological retention pools show difference after 60 days of growth, and the growth speed in the biological retention pool of the group B is higher than that in the biological retention pool of the group A, so that the conclusion is drawn that the inoculation of the saccaromyces morganii can improve the plant heights of the canna plants to a certain extent.
Referring to fig. 4, the roots of canna are trimmed to a certain extent, the initial root length is about 8.5cm, and the canna in the group B biological retention pool added with the saccaromyces morganii agent is generally longer than the canna in the group a biological retention pool, which shows that the inoculation of saccaromyces morganii can effectively improve the root length of the canna and improve the growth condition of plants.
Referring to fig. 5, the biomass in the bioretention ponds is compared, and the underground biomass of canna in the group B bioretention ponds added with the saccharomyces morganii agent is generally higher than that of canna in the group a bioretention ponds, so that the inoculation of saccharomyces morganii can effectively improve the biomass of canna.
The plant height, root length and biomass of the glomus moccasi-canna are obviously higher than those of uninoculated canna, so that the glomus moccasi is judged to improve the plant height of the canna to a certain extent, the growth speed of the plant is accelerated, and the glomus moccasi-canna can reach a symbiotic state.
Further, as a result of comparing the plant height, root length and biomass of canna in fig. 3 to 5, it was found that the larger the particle size of the filler in the bioretention tank, the more suitable the canna growth, and therefore, the anthracite coal having a diameter of 3.0mm to 5.0mm in the bioretention tank was a preferable example of the present application.
Experiment two, verifying beneficial effects of glomus mosseae-canna symbiotic system
Through experimental determination, the quality of non-disinfected tail water of a sewage plant has fluctuation, wherein the index of fecal coliform bacteria is maintained between 1100-54000 MPN/L, and the average value is 16500MPN/L, so that the non-disinfected tail water of the sewage plant needs to be introduced into 6 biological retention tanks according to different concentrations during the experiment, and specifically, sewage with three concentrations is selected in the embodiment: low concentration (faecal coliform is less than 5000MPN/L), medium concentration (faecal coliform is 5000MPN/L-10000MPN/L), and high concentration (faecal coliform is 10000MPN/L-20000 MPN/L).
Specifically, the hydraulic retention time set in this embodiment is 3 days, as shown in fig. 6 to 8, for the B bioretention pond inoculated with sacculus molsius, the number of fecal coliform groups in the effluent will increase first and then decrease with the increase of the influent water concentration, and when the influent water concentration is low (less than 5000MPN/L), the number of fecal coliform groups in the effluent is very low and basically does not reach the detection limit (less than 20MPN/L), and the analysis shows that the fecal coliform groups are removed very quickly due to the too low influent fecal coliform group concentration, so the fecal coliform groups cannot reach the detection limit; when the concentration of the water inlet excrement coliform bacteria is gradually increased, particularly when the number of the water inlet excrement coliform bacteria is 5000-; then, the coliform number of the effluent excrement is reduced along with the continuous increase of the influent concentration, and the effluent concentration is reduced to be below 20MPN/L after the influent concentration reaches 20000 MPN/L.
Specifically, when water is fed at low concentration (less than 5000MPN/L), the Mucor mcirosum-canna symbiotic system does not show enough advantages, the treatment effects of the two biological retention tanks are not greatly different, and the concentration of the coliform group in the effluent excrement does not reach the detection limit due to the low water feeding concentration; when water is fed at medium and high concentrations, the treatment effect of the biological detention pond inoculated with the Mucor mosseae is better than that of the biological detention pond not inoculated with the Mucor mosseae, and the No. 3 biological detention pond inoculated with the Mucor mosseae obviously improves the stability of water outlet and reduces the hygienic index of water outlet as a whole, so the diameter of anthracite in the biological detention pond is 3.0 mm-5.0 mm as the preferred embodiment of the application.
Specifically, the phenomenon that the removal effect of the saccaromyces morchelli-canna symbiotic system on faecal coliform is better is related to the self property of arbuscular mycorrhizal fungi and the factors that the arbuscular mycorrhizal fungi can change the plant form and change the physicochemical property of the matrix, and the like:
on one hand, the infection of the morse sacculus mildew on the canna can obviously improve the root length of plants, the extension length of hypha outside the root of the morse sacculus mildew can reach 10-20 times of the root length, and the hypha outside the root of the canna infected by the morse sacculus mildew is developed, so that the spatial range of the canna rhizosphere for adsorbing and removing the faecal coliform group in sewage is greatly improved, in addition, the morse sacculus mildew can secrete the soil proteins such as sacculus mycin (GRSP) and the like. The property of the Musaceus itself can improve the wetland environment, thereby improving the removal effect of faecal coliform in the early stage.
On the other hand, the Musaceus medicinalis can change the physical and chemical properties of the matrix, thereby improving the removal effect of faecal coliform bacteria to a certain extent. After the Moses sacculus mildew is inoculated, hypha outside plant roots can form a hypha screen outside the roots, the hypha screen extends and stretches into soil, the soil structure is improved, the volume weight of the soil is reduced, and the proportion of 0.25-10mm soil aggregates is improved, the grain size of the filler used in the experiment is smaller than 5mm, so the Moses sacculus mildew has certain influence on the change of the physical properties of the wetland substrate; meanwhile, the chemical property of the substrate can be changed by the mosses sacculus mildew, the pH of the plant root system soil infected by the mosses sacculus mildew can be slightly reduced in the environment without heavy metal stress, and researches show that the removal rate of faecal coliform bacteria can be greatly improved in the acid environment, so that the treatment effect of the wetland can be indirectly influenced by the mosses sacculus mildew by changing the chemical property of the wetland substrate.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method for treating escherichia coli in tail water of a sewage plant is characterized by comprising the following steps: introducing tail water of a sewage plant into a bioretention pond, wherein anthracite is filled in the bioretention pond as a filler; inoculating arbuscular mycorrhizal fungi into aquatic plants in seedling stage, and constructing an arbuscular mycorrhizal fungi-aquatic plant symbiotic system; the arbuscular mycorrhizal fungi-aquatic plant symbiotic system is planted in the bioretention pond.
2. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: after the arbuscular mycorrhizal fungi are inoculated to the aquatic plants in the seedling stage, the cultivation period is not less than 60 days.
3. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: before the arbuscular mycorrhizal fungi are inoculated to the aquatic plants in the seedling stage, the roots of the aquatic plants need to be sterilized.
4. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the arbuscular mycorrhizal fungi include Moxidou Tubuergerian, intraradicular Gliocladium or Moxisa Gliocladium.
5. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the aquatic plant is selected from one or a combination of more of reed, cattail, allium mongolicum regel, rush, cress, wild rice stem, calamus, droughhaired bevel herb, canna indica and ryegrass.
6. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the hydraulic retention time of the tail water of the sewage plant in the biological retention pool is 1 to 3 days.
7. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the biological detention pond is including separating down the pond that sets up and going upward the pond, down the bottom in pond and the pond of going upward is provided with the water passing space, the top in pond is provided with the water supply pipe down, the top in pond of going upward is provided with drainage pipe, sewage factory's tail water flows into down the pond from the water supply pipe, flows down in the pond of going downward, flows into upward in the pond from the water passing space of bottom, upward flows in the pond of going upward, flows out from drainage pipe at last.
8. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the diameter of the anthracite in the biological detention tank is 3.0 mm-5.0 mm.
9. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: and a peristaltic metering pump is arranged on a water supply pipeline of the bioretention pond, and tail water of a sewage plant is quantitatively discharged into the bioretention pond through the peristaltic metering pump.
10. The method of claim 1 for treating escherichia coli in wastewater from a sewage plant, comprising: the inner wall of the drainage pipeline of the bioretention pond is coated with geotextile.
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