CN110894132A - Sewage treatment method based on FCR - Google Patents

Sewage treatment method based on FCR Download PDF

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CN110894132A
CN110894132A CN201911303336.4A CN201911303336A CN110894132A CN 110894132 A CN110894132 A CN 110894132A CN 201911303336 A CN201911303336 A CN 201911303336A CN 110894132 A CN110894132 A CN 110894132A
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tank
stage treatment
fcr
algae
sewage
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许文来
于晗
瞿伦强
陈怡�
钟亚萍
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HAITIAN WATER GROUP Co Ltd
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HAITIAN WATER GROUP Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
    • B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
    • 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
    • C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
    • C02F3/325—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae as symbiotic combination of algae and bacteria
    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • 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
    • C02F2101/20—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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • 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
    • C02F2209/24—CO2
    • 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
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/109—Characterized by the shape
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water

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Abstract

The invention discloses a sewage treatment method based on FCR, which establishes an algae bacteria treatment system through algae and microorganisms to adsorb and decompose N, P and heavy metals in sewage, and has better synergistic effect; meanwhile, the algae and the sludge are mixed and then sequentially flocculated by heavy metals and are converted into planting soil, the heavy metals are degraded by a phytoremediation method, biological optimization is realized, and the problem of heavy metal accumulation caused by the diffusion of algae organisms is solved; meanwhile, the invention also realizes the self-repairing of plants in the FCR reaction tanks through the regular intercommunication of the peer treatment tanks of the FCR reaction tanks which are connected in parallel, reduces the cost and has better practicability.

Description

Sewage treatment method based on FCR
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment method based on FCR.
Background
The food chain reactor FCR (food ChainReactor) process is a patented technology of Oneka corporation of Hungary, and has very high-efficiency sewage purification capacity. The technology can realize the design based on modularization, the treatment scale is from hundreds of tons/day to tens of thousands of tons/day, the adaptability of the system to the environmental change and the impact load resistance capability are strong, and the technology is widely applied to the field of municipal sewage and industrial wastewater treatment abroad. The technology has few domestic application cases. The FCR treatment process is adopted in the industrial park sewage treatment project in the morning, and a good treatment effect is finally obtained
In the sewage treatment process, a large amount of N, P in the sewage is abundant, heavy metals exist in the sewage, N, P and heavy metals in the sewage can be decomposed and adsorbed by microbes attached to the surfaces of plants in the FCR reaction tank, so that the sewage treatment is realized, but the treatment speed of the FCR reaction tank depends on the digestion speed of the microbes, the dependence relationship of a biological chain established in the FCR reaction tank is close, and the treatment speed is delayed to a certain extent.
In the process of FCR sewage treatment, plants for sewage treatment are frequently replenished periodically, once the plants in one treatment tank of an FCR reaction tank are abnormal, the treatment tank can continuously deteriorate, the plants are finally killed and replaced, the treatment deterioration is often caused by slight problems, the treatment tank has to be repaired again, a new batch of plants are replaced, the manual maintenance cost and the subsequent maintenance cost are increased, and unnecessary waste is caused.
Disclosure of Invention
The invention aims to provide a sewage treatment method based on FCR, which establishes an algae bacteria treatment system through algae and microorganisms to adsorb and decompose N, P and heavy metals in sewage, and has better synergistic effect; meanwhile, the algae and the sludge are mixed and then sequentially flocculated by heavy metals and are converted into planting soil, the heavy metals are degraded by a phytoremediation method, biological optimization is realized, and the problem of heavy metal accumulation caused by the diffusion of algae organisms is solved; meanwhile, the invention also realizes the self-repairing of plants in the FCR reaction tanks through the regular intercommunication of the peer treatment tanks of the FCR reaction tanks which are connected in parallel, reduces the cost and has better practicability.
According to the invention, the algae are planted in the third-stage treatment tank to effectively establish an algae bacteria treatment system, N, P elements in the sewage are effectively absorbed through the growth of the algae, meanwhile, the root and hair parts of the algae also provide a hotbed for microorganisms, and the microorganisms and the algae in the tank have a synergistic effect, so that the treatment rate of the sewage is increased; the algae has short growth period, shortens the period of sewage treatment, prevents the large-scale biological transfer of heavy metals by crushing the algae, mixing the crushed algae with sludge, performing centralized flocculation and phytoremediation to treat the heavy metals, and has better practicability; the invention reduces the occupied area by arranging the rotary disc filter and improves the popularization and application range.
The invention is mainly realized by the following technical scheme: a sewage treatment method based on FCR mainly comprises the following steps:
step S101: pretreating sewage, then sequentially introducing the sewage into a first-stage treatment tank to a sixth-stage treatment tank for treatment, planting algae in the third-stage treatment tank, fishing out the algae after the algae turn yellow, drying and crushing;
step S102: the FCR reaction tank parallelly guides the treated sewage into parallel advection secondary sedimentation tanks, and the advection secondary sedimentation tank guides the treated sewage into a rotary disc filter; a sewage discharge outlet of the advection secondary sedimentation tank is communicated with a sludge storage tank;
step S103: guiding the dried and crushed algae in the step S101 into a sludge storage tank for mixing, then adding a heavy metal flocculant for uniformly stirring, then carrying out centrifugal separation to obtain supernatant and sludge, refluxing the supernatant to an FCR reaction tank for secondary treatment, and conveying the sludge to a sludge filter pressing device to obtain filtrate and sludge cake;
step S104: fermenting the mud cakes mixed with plant straws in the step S103, then mixing a regulator to obtain planting soil, then planting plants on the planting soil, and performing phytoremediation on heavy metal soil;
the temperature of the FCR reaction tank is 30-35 ℃; the FCR reaction tank comprises a first-stage treatment tank, a second-stage treatment tank, a third-stage treatment tank, a fourth-stage treatment tank, a fifth-stage treatment tank and a sixth-stage treatment tank which are sequentially connected according to a treatment sequence; the sewage outlet of the sixth-stage treatment tank is communicated with the second-stage treatment tank, the first-stage treatment tank and the second-stage treatment tank are anoxic zones, and the third-stage treatment tank, the fourth-stage treatment tank, the fifth-stage treatment tank and the sixth-stage treatment tank are aerobic zones respectively; the third-stage treatment pool, the fourth-stage treatment pool, the fifth-stage treatment pool and the sixth-stage treatment pool of the FCR reaction pools which are connected in parallel are respectively communicated through pipelines; the pipeline is provided with a control valve and a bidirectional pump; and the backwashing water of the rotary disc filter flows back to the advection secondary sedimentation tank, and the sewage of the advection secondary sedimentation tank flows back to the FCR reaction tank.
The first-stage treatment tank and the second-stage treatment tank of the FCR reaction tank are respectively anoxic treatment tanks, and the third-stage treatment tank, the fourth-stage treatment tank, the fifth-stage treatment tank and the sixth-stage treatment tank are respectively aerobic treatment tanks; the invention leads the FCR reaction tank to have internal reflux by communicating the drain outlet of the sixth-stage treatment tank with the second-stage treatment tank.
Plants in the FCR reaction tank generally secrete hormones in water to maintain growth requirements of the plants, long-time sewage treatment in the FCR reaction tank can cause nutrition imbalance in the same-stage treatment tank, plant growth deviation of the same-stage treatment tank is caused, and once nutritional hormones of the plants are lost, the plants are expected to continuously deteriorate and die. The treatment tanks at the same level of the FCR reaction tanks connected in parallel are communicated periodically to realize the intercommunication of nutrients in the treatment tanks at the same level, so that the growth balance of plants in the treatment tanks is improved, the plant replacement speed is reduced, the labor cost is reduced, the internal self-repairing of the FCR reaction tanks is realized, and the method has better practicability.
The invention effectively enlarges the reaction capacity of sewage treatment by arranging the plurality of FCR reaction tanks connected in parallel and the advection secondary sedimentation tank connected in parallel, is suitable for sewage treatment with large capacity, and has better practicability. The invention carries out heavy metal flocculation treatment on the sludge in the algae drying and crushing mixed sludge storage tank, intensively treats the heavy metals in the sewage, and then carries out heavy metal flocculation treatment on the sludge
According to the invention, the third-stage treatment tank is constructed into the high-efficiency algae pond, the algae is effectively utilized to absorb N, P and heavy metal pollutants in the sewage, the algae is short in planting period and high in absorption efficiency, the treatment period of the sewage is shortened, and the high-efficiency algae treatment tank has better practicability. The invention obtains the fertile soil suitable for planting by fermenting the mud cakes and the plant straws, and the method for fermenting the mud cakes and the plant straws and the method for repairing the plants are the prior art and are not the improvement points of the invention, so the details are not repeated.
The obvious physicochemical characteristics in the High-efficiency algae pond (HRAP) are the day and night change of pH and DO, and the synergistic degradation and absorption process of pollutants by phycomycetes is enhanced through an obviously enhanced phycomycete symbiotic system, so that the High-efficiency algae pond has a better removal effect on nitrogen, phosphorus, organic matters and the like. Compared with the traditional stabilization pond, the HRAP has the characteristics of small floor area and low construction and use cost. In addition, the algae cells have high protein and amino acid contents, and can be used as high-protein fertilizers, animal food, biofuel raw materials and the like. For rural areas with abundant land resources and limited technical level, the HRAP is a water environment treatment technology with abundant benefits, and has great development and popularization prospects.
The structure and the operation mode of the high-efficiency algae pond are beneficial to the establishment of an algae-bacteria symbiotic system, and pollutants such as nitrogen, phosphorus, organic matters and the like in the water body are efficiently degraded through the strong synergistic purification effect of the algae-bacteria. The algae releases a large amount of oxygen in the process of photosynthesis to provide a needed electron donor for heterotrophic bacteria to degrade organic matters and autotrophic bacteria to oxidize ammonia nitrogen. The bacteria use oxygen released by the algae to perform aerobic respiration, and decompose organic matters into micromolecular inorganic matters. Meanwhile, the bacteria release a large amount of carbon dioxide in the respiration process, and the carbon source is required in the growth of the algae and is used for the propagation of the algae. Algae use solar energy as an energy source, and perform photosynthesis using carbon dioxide as a nutrient.
In order to better implement the invention, further, the pretreatment in the step S101 is to introduce the sewage into a coarse grid and a fine grid in sequence for filtration, and then treat the sewage through a rotational flow grit chamber; and refluxing the filtrate in the step S103 to the FCR reaction tank for treatment.
In order to better realize the invention, the third-stage treatment tank comprises a tank body, and a stirring device, a spiral fiber filler and an aeration device which are arranged in the tank body, wherein the spiral fiber filler is arranged in the tank body at equal intervals, and algae are planted between adjacent spiral fiber fillers; the bottom of the tank body is provided with a stirring device and an aeration device; the spiral fiber filler is fixed inside the tank body through a support frame. The spiral fiber filler has a large surface area, provides sufficient attachment points for the growth of microorganisms, forms a nitrification and denitrification place with the pool body, and has good practicability.
In order to better realize the invention, the aeration device further comprises an aeration pipe and an aeration pump, wherein an air inlet of the aeration pump is respectively connected with air and CO through a three-way pipe2The tank is provided with control valves on branch pipes of the three-way pipe, and a pH meter is arranged in the tank body; in daytime, if the pH meter detects the pH value of the third-stage treatment tank>8.5, the aeration pump is communicated with CO2The tank, otherwise the aeration pump is communicated with air; the pH value of the pool body is 6.5-8. In the process of sewage treatment, once the carbon dioxide content in the tank body is low, the photosynthesis efficiency of algae is low, so that the algae-microorganism synergistic effect is reduced, and therefore in order to better perform synergistic treatment on sewage, oxygen can be continuously introduced through the aeration pipe in the process of sewage treatment, and the dissolved oxygen in the tank body is increased to accelerate biodegradation; the invention timely supplements CO in the pool body by introducing real-time monitoring2The amount of the agent can effectively promote the efficiency of the algae-microorganism cooperative treatment, and the agent has better effectAnd (5) practicability.
In order to better realize the invention, further, the concentration of the algae liquid in the pool body is 1800 and 3200cells/ml, and the stirring speed of the stirring device is 30-60 r/min. The algae is planted by adding algae liquid into the pool body for culture, and the concentration of the algae liquid in the pool body and the temperature of the pool body have great influence on the growth rate of the algae; practice proves that the higher the concentration of the algae liquid is, the faster the algae liquid grows, and the higher the sewage treatment effect is.
In order to better implement the method, further, the weight ratio of the mud cakes to the straws in the step S104 is (65-75): 30. the fermentation speed, the fertility degree of the planting soil and the production cost are comprehensively considered, when the weight ratio of the mud cakes to the straws is proper, better planting soil can be obtained, the straws can be changed into valuables, and the method has better practicability.
In order to better realize the invention, further, when the water treatment period of the FCR reactor reaches 1-3 months, the third-stage treatment pool, the fourth-stage treatment pool, the fifth-stage treatment pool and the sixth-stage treatment pool of the FCR reaction pools which are connected in parallel are respectively communicated through pipelines, so that water flows among the same-stage treatment pools of different FCR reaction pools are mutually circulated, and a control valve on the pipeline is closed after 5-15 days of circulation.
In order to better realize the invention, the algae is any one of spirulina, scenedesmus, microsphere algae, green algae, red algae and brown algae.
The invention has the beneficial effects that:
(1) according to the invention, the algae-bacteria treatment system is established by algae and microorganisms, N, P and heavy metals in the sewage are adsorbed and decomposed, and a good synergistic effect is achieved; meanwhile, the algae and the sludge are mixed and then sequentially flocculated by heavy metals and are converted into planting soil, the heavy metals are degraded by a phytoremediation method, biological optimization is realized, and the problem of heavy metal accumulation caused by the diffusion of algae organisms is solved; meanwhile, the invention also realizes the self-repairing of plants in the FCR reaction tanks through the regular intercommunication of the peer treatment tanks of the FCR reaction tanks which are connected in parallel, reduces the cost and has better practicability.
(2) Step S101: pretreating sewage, then sequentially introducing the sewage into a first-stage treatment tank to a sixth-stage treatment tank for treatment, planting algae in the third-stage treatment tank, fishing out the algae after the algae turns yellow, and crushing the algae after drying. According to the invention, N, P pollutants in the sewage are effectively removed by algae in the third-stage treatment tank, and meanwhile, N, P pollutant decomposition in the sewage is effectively accelerated by the synergistic effect of algae and bacteria; the algae has short growth period, shortens the period of sewage treatment and has better practicability.
(3) Step S102: the FCR reaction tank parallelly guides the treated sewage into parallel advection secondary sedimentation tanks, and the advection secondary sedimentation tank guides the treated sewage into a rotary disc filter; and a sewage discharge outlet of the advection secondary sedimentation tank is communicated with the sludge storage tank. The invention effectively enlarges the reaction capacity of sewage treatment by arranging the plurality of FCR reaction tanks connected in parallel and the advection secondary sedimentation tank connected in parallel, is suitable for sewage treatment with large capacity, and has better practicability.
(4) Step S104: and (5) fermenting the mud cakes mixed with plant straws in the step (S103), mixing the plant straws with a regulator to obtain planting soil, planting plants on the planting soil, and performing phytoremediation on the heavy metal soil. The method removes heavy metals in soil in an environment-friendly way by a phytoremediation method, changes plant straws into valuables, and has good practicability.
(5) The temperature of the FCR reaction tank is 30-35 ℃; and the drain outlet of the sixth-stage treatment pool is communicated with the second-stage treatment pool, and the third-stage treatment pool, the fourth-stage treatment pool, the fifth-stage treatment pool and the sixth-stage treatment pool of the FCR reaction pool which are connected in parallel are respectively communicated through pipelines. The treatment tanks at the same level of the FCR reaction tanks connected in parallel are communicated periodically to realize the intercommunication of nutrients in the treatment tanks at the same level, so that the growth balance of plants in the treatment tanks is improved, the plant replacement speed is reduced, the labor cost is reduced, the internal self-repairing of the FCR reaction tanks is realized, and the method has better practicability. The temperature setting of the invention is beneficial to the growth of algae and has better practicability.
(6) The third-stage treatment tank comprises a tank body, and a stirring device, a spiral fiber filler and an aeration device which are arranged in the tank body, wherein the spiral fiber filler is arranged in the tank body at equal intervals, and algae are planted between every two adjacent spiral fiber fillers; the bottom of the tank body is provided with a stirring device and an aeration device; the spiral fiber filler is fixed inside the tank body through a support frame. The spiral fiber filler has a large surface area, provides sufficient attachment points for the growth of microorganisms, and forms a nitrification and denitrification place with the pool body, so that the spiral fiber filler has good practicability.
(7) The aeration device comprises an aeration pipe and an aeration pump, wherein an air inlet of the aeration pump is respectively connected with air and CO through a three-way pipe2The tank is provided with control valves on branch pipes of the three-way pipe, and a pH meter is arranged in the tank body; in daytime, if the pH meter detects the pH value of the third-stage treatment tank>8.5, the aeration pump is communicated with CO2The tank, otherwise the aeration pump is communicated with air; the pH value of the pool body is 6.5-8. The invention timely supplements CO in the pool body by introducing real-time monitoring2The amount of the additive can effectively promote the efficiency of the algae-microorganism cooperative treatment, and has better practicability.
(8) And when the water treatment period of the FCR reactor reaches 1-3 months, respectively communicating a third-stage treatment pool, a fourth-stage treatment pool, a fifth-stage treatment pool and a sixth-stage treatment pool of the FCR reaction pools which are connected in parallel through pipelines, so that water flows among the same-stage treatment pools of different FCR reaction pools are mutually circulated, and closing a control valve on the pipeline after 5-15 days of circulation. The treatment tanks at the same level of the FCR reaction tanks connected in parallel are communicated periodically to realize the intercommunication of nutrients in the treatment tanks at the same level, so that the growth balance of plants in the treatment tanks is improved, the plant replacement speed is reduced, the labor cost is reduced, the internal self-repairing of the FCR reaction tanks is realized, and the method has better practicability.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
Example 1:
a sewage treatment method based on FCR mainly comprises the following steps:
step S101: pretreating sewage, then sequentially introducing the sewage into a first-stage treatment tank to a sixth-stage treatment tank for treatment, planting algae in the third-stage treatment tank, fishing out the algae after the algae turn yellow, drying and crushing;
step S102: the FCR reaction tank parallelly guides the treated sewage into parallel advection secondary sedimentation tanks, and the advection secondary sedimentation tank guides the treated sewage into a rotary disc filter; a sewage discharge outlet of the advection secondary sedimentation tank is communicated with a sludge storage tank;
step S103: guiding the dried and crushed algae in the step S101 into a sludge storage tank for mixing, then adding a heavy metal flocculant for uniformly stirring, then carrying out centrifugal separation to obtain supernatant and sludge, refluxing the supernatant to an FCR reaction tank for secondary treatment, and conveying the sludge to a sludge filter pressing device to obtain filtrate and sludge cake;
step S104: fermenting the mud cakes mixed with plant straws in the step S103, then mixing a regulator to obtain planting soil, then planting plants on the planting soil, and performing phytoremediation on heavy metal soil;
the temperature of the FCR reaction tank is 30-35 ℃; the FCR reaction tank comprises a first-stage treatment tank, a second-stage treatment tank, a third-stage treatment tank, a fourth-stage treatment tank, a fifth-stage treatment tank and a sixth-stage treatment tank which are sequentially connected according to a treatment sequence; the sewage outlet of the sixth-stage treatment tank is communicated with the second-stage treatment tank, the first-stage treatment tank and the second-stage treatment tank are anoxic zones, and the third-stage treatment tank, the fourth-stage treatment tank, the fifth-stage treatment tank and the sixth-stage treatment tank are aerobic zones respectively; the third-stage treatment pool, the fourth-stage treatment pool, the fifth-stage treatment pool and the sixth-stage treatment pool of the FCR reaction pools which are connected in parallel are respectively communicated through pipelines; the pipeline is provided with a control valve and a bidirectional pump; and the backwashing water of the rotary disc filter flows back to the advection secondary sedimentation tank, and the sewage of the advection secondary sedimentation tank flows back to the FCR reaction tank.
According to the invention, the algae-bacteria treatment system is established by algae and microorganisms, N, P and heavy metals in the sewage are adsorbed and decomposed, and a good synergistic effect is achieved; meanwhile, the algae and the sludge are mixed and then sequentially flocculated by heavy metals and are converted into planting soil, the heavy metals are degraded by a phytoremediation method, biological optimization is realized, and the problem of heavy metal accumulation caused by the diffusion of algae organisms is solved; meanwhile, the invention also realizes the self-repairing of plants in the FCR reaction tanks through the regular intercommunication of the peer treatment tanks of the FCR reaction tanks which are connected in parallel, reduces the cost and has better practicability.
Example 2:
in this embodiment, optimization is performed on the basis of embodiment 1, and as shown in fig. 1, the pretreatment in step S101 is to introduce sewage into a coarse grid and a fine grid in sequence for filtration, and then treat the sewage through a rotational flow grit chamber; and refluxing the filtrate in the step S103 to the FCR reaction tank for treatment.
As shown in fig. 1, sewage is pretreated by a coarse grating, a fine grating and a rotational flow grit chamber in sequence, wherein the diameter of the coarse grating is 20mm, the diameter of the fine grating is 5mm, and filter residues obtained by the treatment of the coarse grating and the fine grating are respectively arranged at corresponding grating residue storage devices and are treated uniformly and periodically; filter residues of the cyclone grit chamber are placed at a sand storage device; the backwashing water of the rotary disc filter flows back into the FCR reaction tank for secondary treatment; supernatant of the centrifugal tank and filtrate of the sludge filter-pressing device both flow back into the FCR reaction tank for secondary treatment; and introducing the water treated by the rotary disc filter into a disinfection tank to obtain purified water. The invention effectively enlarges the reaction capacity of sewage treatment by arranging the plurality of FCR reaction tanks connected in parallel and the advection secondary sedimentation tank connected in parallel, is suitable for sewage treatment with large capacity, and has better practicability.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
this example was optimized on the basis of example 1 or 2, soThe aeration device comprises an aeration pipe and an aeration pump, wherein an air inlet of the aeration pump is respectively connected with air and CO through a three-way pipe2The tank is provided with control valves on branch pipes of the three-way pipe, and a pH meter is arranged in the tank body; in daytime, if the pH meter detects the pH value of the third-stage treatment tank>8.5, the aeration pump is communicated with CO2The tank, otherwise the aeration pump is communicated with air; the pH value of the pool body is 6.5-8. The concentration of the algae liquid in the pool body is 1800 cells/ml and 3200cells/ml, and the stirring speed of the stirring device is 30-60 r/min. The weight ratio of the mud cakes to the straws in the step S104 is (65-75): 30.
in the process of sewage treatment, once the carbon dioxide content in the tank body is low, the photosynthesis efficiency of algae is low, so that the algae-microorganism synergistic effect is reduced, and therefore in order to better perform synergistic treatment on sewage, oxygen can be continuously introduced through the aeration pipe in the process of sewage treatment, and the dissolved oxygen in the tank body is increased to accelerate biodegradation; the invention timely supplements CO in the pool body by introducing real-time monitoring2The amount of the additive can effectively promote the efficiency of the algae-microorganism cooperative treatment, and has better practicability. The algae is planted by adding algae liquid into the pool body for culture, and the concentration of the algae liquid in the pool body and the temperature of the pool body have great influence on the growth rate of the algae; practice proves that the higher the concentration of the algae liquid is, the faster the algae liquid grows, and the higher the sewage treatment effect is.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
in this embodiment, optimization is performed on the basis of embodiment 1, and when the water treatment period of the FCR reactor reaches 1 to 3 months, the third-stage treatment tank, the fourth-stage treatment tank, the fifth-stage treatment tank, and the sixth-stage treatment tank of the FCR reaction tanks connected in parallel are respectively communicated through pipelines, so that water flows among the treatment tanks at the same stage of different FCR reaction tanks are circulated, and the control valves on the pipelines are closed after 5 to 15 days of circulation. The algae is any one of Spirulina, Scenedesmus, Micrococcus, green algae, red algae, and brown algae.
Plants in the FCR reaction tank generally secrete hormones in water to maintain growth requirements of the plants, long-time sewage treatment in the FCR reaction tank can cause nutrition imbalance in the same-stage treatment tank, plant growth deviation of the same-stage treatment tank is caused, and once nutritional hormones of the plants are lost, the plants are expected to continuously deteriorate and die. The treatment tanks at the same level of the FCR reaction tanks connected in parallel are communicated periodically to realize the intercommunication of nutrients in the treatment tanks at the same level, so that the growth balance of plants in the treatment tanks is improved, the plant replacement speed is reduced, the labor cost is reduced, the internal self-repairing of the FCR reaction tanks is realized, and the method has better practicability.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (8)

1. A sewage treatment method based on FCR is characterized by mainly comprising the following steps:
step S101: pretreating sewage, then sequentially introducing the sewage into a first-stage treatment tank to a sixth-stage treatment tank for treatment, planting algae in the third-stage treatment tank, fishing out the algae after the algae turn yellow, drying and crushing;
step S102: the FCR reaction tank parallelly guides the treated sewage into parallel advection secondary sedimentation tanks, and the advection secondary sedimentation tank guides the treated sewage into a rotary disc filter; a sewage discharge outlet of the advection secondary sedimentation tank is communicated with a sludge storage tank;
step S103: guiding the dried and crushed algae in the step S101 into a sludge storage tank for mixing, then adding a heavy metal flocculant for uniformly stirring, then carrying out centrifugal separation to obtain supernatant and sludge, refluxing the supernatant to an FCR reaction tank for secondary treatment, and conveying the sludge to a sludge filter pressing device to obtain filtrate and sludge cake;
step S104: fermenting the mud cakes mixed with plant straws in the step S103, then mixing a regulator to obtain planting soil, then planting plants on the planting soil, and performing phytoremediation on heavy metal soil;
the temperature of the FCR reaction tank is 30-35 ℃; the FCR reaction tank comprises a first-stage treatment tank, a second-stage treatment tank, a third-stage treatment tank, a fourth-stage treatment tank, a fifth-stage treatment tank and a sixth-stage treatment tank which are sequentially connected according to a treatment sequence; the sewage outlet of the sixth-stage treatment tank is communicated with the second-stage treatment tank, the first-stage treatment tank and the second-stage treatment tank are anoxic zones, and the third-stage treatment tank, the fourth-stage treatment tank, the fifth-stage treatment tank and the sixth-stage treatment tank are aerobic zones respectively; the third-stage treatment pool, the fourth-stage treatment pool, the fifth-stage treatment pool and the sixth-stage treatment pool of the FCR reaction pools which are connected in parallel are respectively communicated through pipelines; the pipeline is provided with a control valve and a bidirectional pump; and the backwashing water of the rotary disc filter flows back to the advection secondary sedimentation tank, and the sewage of the advection secondary sedimentation tank flows back to the FCR reaction tank.
2. The FCR-based sewage treatment method as claimed in claim 1, wherein the pretreatment in step S101 is to introduce the sewage into a coarse grid and a fine grid in sequence for filtration, and then treat the sewage through a cyclone grit chamber; and refluxing the filtrate in the step S103 to the FCR reaction tank for treatment.
3. The FCR-based sewage treatment method according to claim 2, wherein the third-stage treatment tank comprises a tank body, and a stirring device, a spiral fiber filler and an aeration device which are arranged inside the tank body, wherein the spiral fiber filler is arranged inside the tank body at equal intervals, and algae are planted between adjacent spiral fiber fillers; the bottom of the tank body is provided with a stirring device and an aeration device; the spiral fiber filler is fixed inside the tank body through a support frame.
4. The FCR-based sewage treatment method of claim 3, wherein the aeration device comprises an aeration pipe and an aeration pump, and the aeration pump is used for aerationThe air inlet of the aeration pump is respectively connected with air and CO through a three-way pipe2The tank is provided with control valves on branch pipes of the three-way pipe, and a pH meter is arranged in the tank body; in daytime, if the pH meter detects the pH value of the third-stage treatment tank>8.5, the aeration pump is communicated with CO2The tank, otherwise the aeration pump is communicated with air; the pH value of the pool body is 6.5-8.
5. The FCR-based sewage treatment method as claimed in claim 4, wherein the concentration of the algae liquid in the pool body is 1800 cells/ml and 3200cells/ml, and the stirring speed of the stirring device is 30-60 r/min.
6. The FCR-based sewage treatment method of claim 4, wherein the weight ratio of the mud cake to the straw in step S104 is (65-75): 30.
7. an FCR-based sewage treatment method according to any one of claims 1 to 6, wherein when the FCR reactor has a water treatment period of 1 to 3 months, the third stage treatment tank, the fourth stage treatment tank, the fifth stage treatment tank and the sixth stage treatment tank of the FCR reaction tanks connected in parallel are respectively communicated through pipelines, so that water flows among the treatment tanks in the same stage of different FCR reaction tanks are mutually circulated, and the control valve on the pipeline is closed after 5 to 15 days of circulation.
8. The FCR-based sewage treatment method of any of claims 1-6, wherein the algae is any one of Spirulina, Scenedesmus, Micrococcus, Chlorella, Red algae, and Brown algae.
CN201911303336.4A 2019-12-17 2019-12-17 Sewage treatment method based on FCR Pending CN110894132A (en)

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Application publication date: 20200320