CN108249624B - Water treatment method based on activated carbon filter membrane technology - Google Patents

Water treatment method based on activated carbon filter membrane technology Download PDF

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CN108249624B
CN108249624B CN201810122689.3A CN201810122689A CN108249624B CN 108249624 B CN108249624 B CN 108249624B CN 201810122689 A CN201810122689 A CN 201810122689A CN 108249624 B CN108249624 B CN 108249624B
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water
water body
activated carbon
filter membrane
machine
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CN108249624A (en
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许榕
田路泞
陈涛
蒋青
林凌
舒旭
吴磊
陈玺
李强
盛耀旗
刘俊华
韩哲楠
张如宾
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Guangzhou Guxiangyuan Water Treatment Co ltd
Wuhan Optics Valley Environmental Protection Technology Co ltd
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Guangzhou Guxiangyuan Water Treatment Co ltd
Wuhan Optics Valley Environmental Protection Technology 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
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C02F1/766—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/001—Runoff or storm water

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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a water treatment method based on an activated carbon filter membrane technology, and belongs to the technical field of water treatment. The treatment method comprises the steps of sequentially treating a water body to be treated in an air floatation machine and a filter membrane machine from front to back, wherein after the water body enters the air floatation machine, a denitrifying agent and a dephosphorizing agent are added into the water body, solid suspended matters are separated to obtain a first water body, the first water body enters the filter membrane machine along the bottom of the air floatation machine, the active carbon in the filter membrane machine is used for adsorbing pollutants in the first water body, the COD content is reduced to obtain a second water body, sodium hypochlorite is continuously added into the second water body for treatment to obtain a third water body, and the water quality index of the third water body reaches the first-level A discharge standard of pollutant discharge Standard-GB 18918-2002 of urban sewage treatment plant. The treatment method has the advantages of small occupied area of the adopted equipment, low operation cost and capability of effectively treating rainwater or mixed liquid of the rainwater and sewage.

Description

Water treatment method based on activated carbon filter membrane technology
Technical Field
The invention relates to a method for treating rainwater and domestic sewage, belongs to the technical field of water treatment, and particularly relates to a water treatment method based on an activated carbon filter membrane technology.
Background
Along with the continuous development of social economy, the requirement of people on the quality of living environment is continuously improved, the requirements on water quality protection of drinking water sources and ecological environment protection of lakes and rivers are continuously enhanced, so the pressure of water resource shortage and water pollution prevention and control is increased, the polluted water quality is treated, the process flow is longer, the consumed fund is more, especially, (1) in a combined drainage system, domestic sewage, industrial wastewater and rainwater are mixed and discharged in the same pipe and channel, the sewage and rainwater discharged in a combined mode in rainy seasons exceed the treatment capacity of a sewage treatment plant, and part of sewage is carried by an overflow well and discharged into a river channel. When the runoff flow velocity of the rainfall flood is large, pollutants deposited from sewage in the pipe network in the rain-out period are flushed and enter a river channel along with overflow to become a large source of pollutants; (2) surface water formed by unsmooth drainage of initial rainwater can enter urban river channels in the form of surface overflow. In the initial stage, rainwater soaks non-point source pollution sources such as road pollutants, household garbage, organic wastes of animals and plants, more pollution components can be dissolved out by soaking, particularly, after organic matters such as the household garbage are soaked for a long time, more total nitrogen and total phosphorus in the pollutants are separated out, and the discharge of nitrogen-containing and phosphorus-containing pollutants is one of the main factors causing eutrophication of water bodies in rivers and lakes; (3) in dry seasons, the water level of part of main canals and closed water bodies is reduced, and good water is not available for water supplement, so that only tap water can be used as a water supplement source, and a large amount of water resource waste is caused; (4) at present, the emission standard executed by most urban sewage treatment plants is improved to a first-class A standard from a first-class B standard in pollutant emission Standard of urban sewage treatment plants (GB 18918-.
Besides sewage treatment plants, the modification of rainwater lift pump stations and the treatment of discharged water are also important ways for controlling urban pollution. In the area of the mixed flow drainage system, partial sewage is mixed in the rainwater pipe duct and the rainwater lifting pump station, so that rainwater cannot be discharged up to the standard, and the rainwater lifting pump station along the river can only discharge unqualified mixed water into a natural water body in sunny days or rainy days.
Therefore, it is one of the problems to be solved at present that how to perform post-treatment and make the water quality change in the rainwater lift pump station or mixed flow drainage system to meet the standard of drinking water is complex.
Disclosure of Invention
In order to solve the above problems, the present invention discloses a water treatment method for effectively treating rainwater or a mixed solution of rainwater and sewage.
In order to achieve the purpose, the invention discloses a water treatment method based on an activated carbon filter membrane technology, which comprises the step of enabling water to be treated to sequentially flow through an air floatation machine and a filter membrane machine from front to back, wherein the water to be treated enters the air floatation machine and then is treated by a denitrifying agent and/or a dephosphorizing agent to obtain a first water body, and the first water body flows into the filter membrane machine and is treated by activated carbon arranged inside the filter membrane machine to obtain a second water body.
Further preferably, the method also comprises a step of obtaining a water body III after the water body II is treated by sodium hypochlorite, wherein the water quality index of the water body III meets the first-class A emission standard of pollutant emission Standard-GB 18918-2002 of urban sewage treatment plant.
Still more preferably, the amount of sodium hypochlorite used is 600-1400 mg per 1L of water treated.
Still further preferably, activated carbon placed inside the filter membrane machine is subjected to adsorption saturation and then is treated by a plate-and-frame filter press connected with an air flotation machine to obtain filtrate and dehydrated activated carbon, the filtrate flows back into the air flotation machine, the dehydrated activated carbon is treated by an activated carbon regeneration system connected with the plate-and-frame filter press to obtain activated carbon with restored activity, and the activated carbon with restored activity is continuously sent to the filter membrane machine.
More preferably, the using amount of the activated carbon in the air flotation machine is 0.8-1.2 tons of activated carbon per 1 ten thousand tons of water.
More preferably, the denitrifying agent is sodium hypochlorite and sodium dichloroisocyanurate in a mass ratio of 1:1, wherein the sodium hypochlorite used in the denitrifying agent and the activated carbon used in the water body treatment are the same substances.
Wherein, sodium hypochlorite is liquid, sodium dichloroisocyanurate is solid, the two substances generate chlorine in water, and the chlorine is a strong oxidant and can oxidize ammonia nitrogen in the water into nontoxic and harmless nitrogen.
Still more preferably, the phosphorus removal agent is at least one of soluble iron salt, soluble aluminum salt and soluble calcium salt.
Preferably, the phosphorus removing agent is at least one of ferrous sulfate and aluminum chloride.
Preferably, the phosphorus removal agent is ferrous sulfate.
The activated carbon is preferably conventionally used activated carbon, and the manufacturer thereof has no particular restriction.
Preferably, the water to be treated entering the air flotation machine is rainwater or urban sewage or a mixed liquid of rainwater and urban sewage, wherein the rainwater is collected by a rainwater lifting pump station, and the urban sewage is collected by the rainwater lifting pump station after flowing through a polluted road surface.
In order to better realize the technical scheme of the invention, the active carbon regeneration system is a device disclosed in Chinese patent application (application publication number: CN103739104A, application publication date: 2014-04-23), and the filter membrane machine is an uninterrupted self-exchange active coke sewage treatment system disclosed in Chinese novel patent (grant publication number: CN205241280U, grant publication date: 2016-05-18).
Has the advantages that:
1. the treatment method is adopted to treat the rainwater collected by the urban rainwater lifting pump station or the mixed solution of the rainwater and the urban sewage, the effluent water quality index reaches the first-level A discharge standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918 + 2002), and further the water quality is deeply treated, so that all the indexes reach the surface IV class water standard, and part of the water quality indexes reach the surface III class water standard, thereby completely meeting the sewage discharge standard executed for discharging into closed semi-closed water areas such as key drainage basins, lakes, reservoirs and the like and directly discharging into natural water;
2. the equipment adopted by the treatment method has the advantages of small occupied area, low operation cost, high treatment efficiency, large water quantity, wide range, strong impact resistance, capability of coping with extreme inflow water quality conditions and the like;
3. the treatment method can be used together with a sewage treatment plant, a rainwater lifting pump station and the like to form advantage complementation.
Drawings
FIG. 1 is a process flow diagram of a water treatment process according to the present invention;
FIG. 2 is a curve showing the effect of removing COD in the example of the present invention;
FIG. 3 is a graph showing the ammonia nitrogen removal effect of the embodiment of the present invention;
FIG. 4 is a total nitrogen removal effect curve according to an embodiment of the present invention;
FIG. 5 is a graph of total phosphorus removal performance according to an embodiment of the present invention;
FIG. 6 is a graph showing the effect of removing suspended solids according to an embodiment of the present invention.
Detailed Description
The invention mainly aims at treating rainwater or municipal sewage or mixed liquid of the municipal sewage and the rainwater conveyed by a rainwater lifting pump station in a municipal drainage pump, wherein the municipal sewage is collected after the rainwater flows through a polluted ground, and the components of the municipal sewage are relatively complex compared with the components of the rainwater.
The invention discloses a water treatment method based on an activated carbon filter membrane technology, which is used for researching the water quality in rainwater or urban sewage, finding that the water quality in a water body is generally unstable, each nutrient component is unbalanced, the concentration of organic matters is lower, wherein main pollution factors in the water body are reducing substances (COD), Suspended Solids (SS), ammonia nitrogen, total phosphorus and the like, so that the water quality obtained after treatment can be better than the requirement of first-class A standard water quality in pollutant discharge Standard of municipal Sewage treatment plant (GB 18918-.
The main process flow of the water treatment method is shown in figure 1, water is taken from a newborn pump station (namely a rainwater lifting pump station) and lifted into air flotation machines 2 through water inlet pumps 1, generally, each air flotation machine 2 is provided with a dissolved air tank, the dissolved air tank releases micro bubbles into a water body after pressurizing and dissolving air, meanwhile, denitrification agents and phosphorus removal agents are added into inlet water to carry suspended matters such as SS, colloid and the like in the water body to the water surface in the bubble floating process, after standing for enough time, suspended matters such as SS, colloid and the like are finally separated from the water body through a slag scraper to obtain a water body I, the treated water body I enters a filter membrane machine 3 from the bottom of the air flotation machine 2, activated carbon is placed in the filter membrane machine 3, pollutants in the water body I are continuously adsorbed by utilizing the adsorption effect of the activated carbon, the content of COD and the like in the water body is greatly reduced, the deep purification effect is achieved, and a water body II is obtained, and continuously adding sodium hypochlorite into the water II to further reduce the content of ammonia nitrogen to obtain a water III, and testing the water III to ensure that the water quality index of the water III reaches the first-class A emission standard of pollutant emission Standard-GB 18918-2002 of urban sewage treatment plants and can be directly recycled.
As can be seen from fig. 1, after the activated carbon in the membrane filter 3 is saturated by adsorption, the activated carbon is usually taken out and put into a new activated carbon, and the cost of the activated carbon is high, in order to reduce the production cost, the present invention combines the activated carbon regeneration treatment technology, the activated carbon saturated by adsorption is put into the waste carbon pool 4, and then is dehydrated by the plate and frame filter press 5, the obtained filtrate flows back to the air flotation machine 2 to complete the next water treatment process, the dehydrated activated carbon enters the activated carbon regeneration system 6 for regeneration, and after the adsorption capacity is recovered, the activated carbon is mixed with the composite adsorbent and enters the carbon preparation pool 7 for recycling of the membrane filter 3, wherein the activated carbon regeneration device used in the present invention is a regeneration furnace disclosed in the chinese patent application (application publication No. CN103739104A, application publication No. 2014-04-23); the filter membrane machine 3 is an uninterrupted self-exchange active coke sewage treatment system disclosed in a novel Chinese patent (grant publication number: CN205241280U, grant publication date: 2016-05-18).
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
The quality of the inlet water selected by the implementation is inferior to the first-class B standard, as shown in Table 1:
TABLE 1 quality of influent water
Figure BDA0001572565260000051
Figure BDA0001572565260000061
The effluent quality is specified to meet the first-class A water quality as the lowest standard, and the effluent quality is strived to reach or be superior to the surface IV standard, and the standard is shown in the table 2;
TABLE 2 effluent quality Standard
Index (I) Designed effluent quality Surface of earth IV First order A
COD(mg/L) 30 30 50
BOD5(mg/L) 8 6 10
Ammonia nitrogen (mg/L) 5(8) 1.5 5(8)
Total nitrogen (mg/L) 15 1.5 15
Total phosphorus (mg/L) 0.3 0.3 0.5
In the above tables 1 and 2, the parenthesized values are control indexes when the water temperature is greater than 12 ℃, and the parenthesized values are control indexes when the water temperature is less than or equal to 12 ℃.
The equipment selected in this example is the equipment shown in fig. 1, wherein there are two air flotation machines and two membrane filtration machines, and the two air flotation machines and the membrane filtration machines are arranged in parallel to form two units, and the water treatment capacity of each unit is 5000m3Every day, two units run simultaneously and satisfy 10000m3Treatment of/dAn amount; specifically, the method comprises the following steps: the size of the air flotation machine is that the length is multiplied by the width, multiplied by the height is 13m multiplied by 2.8m multiplied by 2.5m, and the diameter of an equipped dissolved air tank (the model is ZYW-5 which is produced by Jiangsu Green Yida environmental protection science and technology limited in the invention is preferably 1000 mm); the size of the filter membrane machine is 7.5m × 6.0m × 3.3m, and the volume of the filter chamber of the plate-and-frame filter press is 3m3。
The specific process parameter control comprises the following steps:
two water inlet pumps are selected, frequency conversion control is adopted, the two water inlet pumps are started simultaneously when the sewage treatment system operates normally, the non-working time of about 3 hours is considered when the filter membrane machine operates every day, the actual operation time every day is 21 hours, the frequency of the water inlet pumps is set to be 40Hz, and the water inlet flow is 470m3H, satisfying 10000m per day3The throughput of (a);
specifically, the air flotation machine mainly controls the dosage: the adding amount of liquid PAC with the mass percent of 10 percent is 50L/h (the concentration is 100mg/L), and the adding amount is 25L/h for each unit; the PAC dosage with the mass percentage of 1 per mill is 50L/h (the concentration is 1mg/L), and the dosage is 25L/h for each unit; adding a mixture of sodium hypochlorite liquid and sodium dichloroisocyanurate solid in a mass ratio of 1:1, wherein the adding amount of the mixture is 2kg of the mixture added to 1L of water to be treated; the air pressure of the dissolved air tank is controlled between 0.35MP and 0.4MP, and the liquid level of the air flotation machine is kept constant, so that scum is conveniently removed;
specifically, the filter membrane machine has 3 operating states, normal operation, aeration carbon washing and waste carbon replacement, the switching of the 3 states is mainly guided and completed by a negative pressure meter before a water outlet pump of the filter membrane machine, the aeration carbon washing is carried out when the negative pressure meter is at 0.05MP, the carbon replacement work is carried out when the negative pressure meter still reaches more than 0.06MP after the carbon washing is repeated and the water outlet flow is greatly reduced, the waste carbon is thrown into a waste carbon tank, then new carbon is thrown and added, and the filter membrane machine enters the normal operating state.
Wherein, the activated carbon is aerated and washed once in 6 to 8 hours generally, the activated carbon is replaced once in 24 hours, and the dosage of the activated carbon is preferably 1 ton of carbon per ten thousand tons of water.
The adding position of the sodium hypochlorite liquid is at the position of a main water outlet pipeline, the adding amount of the sodium hypochlorite liquid is 500L/h (the concentration is 1000mg/L), and the sodium hypochlorite liquid can degrade 10mg/L ammonia nitrogen.
The water quality is treated by adopting the equipment and the related process parameters, and sampling is carried out for 10 days continuously for detection, and the obtained results are shown in a table 3;
TABLE 3 Water quality test data results
Figure BDA0001572565260000071
Figure BDA0001572565260000081
Each index in table 3 was analyzed to obtain fig. 2, fig. 3, fig. 4, fig. 5, and fig. 6, respectively.
As can be seen from figure 2, the COD concentration of the inlet water is 71-121 mg/L during the test period, the average concentration is 84.6mg/L, the COD concentration of the outlet water is 12.3-18.5 mg/L, the average concentration is 15.7mg/L, and the average removal rate of COD is 80.8%.
As can be seen from the description of NH in conjunction with FIGS. 3, 4 and 53As can be seen from the analysis of the removing effect of-N, TN and TP, in the debugging and running period of the system, the denitrifying agent and the chemical phosphorus removal agent are added at the water inlet front end of the system for pretreatment and then enter the filter membrane machine for deep treatment, various water outlet indexes can reach the continuous and stable design requirement, and the denitrifying agent can be used for NH3Good removal of-N and TN, NH3The average removal rate of-N is more than 90%, and the average removal rate of TN is more than 90%. By adding chemical phosphorus removal agent, the concentration of TP in the effluent is 0.23mg/L, the average removal rate is more than 85 percent, and NH in the effluent3the-N, TN and TP are superior to the first grade A emission standard specified in the discharge Standard of pollutants for municipal wastewater treatment plants. Wherein, in the fifth day, NH is generated due to the deterioration of the front end inflow water3The concentration of-N, TN and TP was 19.7mg/L and 22.6m, respectivelyg/L and 3.18mg/L, the final effluent can still reach the effluent design standard through the treatment of the sewage system, which shows that the treatment system has stronger impact resistance and can deal with the extreme inflow water quality condition.
As can be seen from figure 6, the treatment system adopts the membrane filter process, and the carbon columns with certain thickness formed on the surface of the filter screen by the activated carbon have the adsorption effect on the COD in the sewage and have good physical interception effect on the SS, so that most of the SS in the sewage can be removed.
The test data also show that the concentration of the effluent SS is kept at 1mg/L and is almost the lower limit value of SS detection during the test, the average removal rate is up to more than 97 percent, which shows that the system has stronger treatment capacity for the SS in water, and the effluent SS can still be stably discharged after reaching 84mg/L in the fifth day of inflow SS.
In conclusion, under the condition that the inlet water is close to the first-grade water quality B, the average COD value of the outlet water after the reagent is added and the treatment is 15.7mg/L, and the average removal rate is 80.8 percent and is superior to the standard (20mg/L) of the surface III type water; the average value of the ammonia nitrogen effluent is 0.92mg/L, the average removal rate is more than 90 percent and is superior to the III-class water standard (1.0 mg/L); the average value of total nitrogen effluent is 1.31mg/L, the average removal rate is more than 90 percent and is superior to the IV-class water standard (1.5 mg/L); the average value of the total phosphorus effluent is 0.23mg/L, the average removal rate is more than 90 percent and is superior to the IV-class water standard
(0.3 mg/L). The SS concentration of the effluent is kept at 1mg/L during the test, the average removal rate is up to more than 97 percent and is almost the SS detection lower limit value; and when the front end water inlet is suddenly deteriorated and indexes such as COD (chemical oxygen demand), ammonia nitrogen, total phosphorus concentration and the like greatly exceed the designed water inlet value, the final water outlet of the system can still reach or exceed the design standard.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention. In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (3)

1. A water treatment method based on an activated carbon filter membrane technology comprises the step that water to be treated sequentially flows through an air floatation machine (2) and a filter membrane machine (3) from front to back, and is characterized in that: after the water body to be treated enters the air floatation machine (2), adding a denitrifying agent and a dephosphorizing agent into air floatation inlet water to treat the water body I to obtain a water body I, wherein the denitrifying agent is sodium hypochlorite and sodium dichloroisocyanurate in a mass ratio of 1: 1; the water body I flows into the filter membrane machine (3) and is treated by activated carbon placed in the filter membrane machine (3) to obtain a water body II; the method also comprises a step of obtaining a water body III after the water body II is treated by sodium hypochlorite, wherein the water quality index of the water body III accords with the first-class A emission standard of pollutant emission Standard-GB 18918-2002 of urban sewage treatment plants; after the activated carbon placed in the filter membrane machine (3) is subjected to adsorption saturation, the activated carbon is treated by a plate-and-frame filter press (5) connected with an air flotation machine (2) to obtain filtrate and dehydrated activated carbon, the filtrate flows back into the air flotation machine (2), the dehydrated activated carbon is treated by an activated carbon regeneration system (6) connected with the plate-and-frame filter press (5) to obtain activated carbon with recovered activity, and the activated carbon with recovered activity is continuously sent to the filter membrane machine (3); the water body to be treated entering the air floatation machine (2) is rainwater or urban sewage or a mixed liquid of the rainwater and the urban sewage.
2. The water treatment method based on the activated carbon filtration membrane technology as recited in claim 1, wherein: the usage amount of the sodium hypochlorite is 600-1400 mg of the sodium hypochlorite for each 1L of water to be treated.
3. The water treatment method based on the activated carbon filtration membrane technology as claimed in claim 1 or 2, wherein: the phosphorus removing agent is at least one of soluble ferric salt, soluble aluminum salt and soluble calcium salt.
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