CN112158976A - Method for treating micro-polluted water - Google Patents

Method for treating micro-polluted water Download PDF

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Publication number
CN112158976A
CN112158976A CN202010842947.2A CN202010842947A CN112158976A CN 112158976 A CN112158976 A CN 112158976A CN 202010842947 A CN202010842947 A CN 202010842947A CN 112158976 A CN112158976 A CN 112158976A
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micro
water
dithionite
oxidation
treating
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Inventor
张小磊
宋伟
周雨馨
李继
付彩霞
谢婉莹
王卓悦
王可
宋祺
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Shenzhen Graduate School Harbin Institute of Technology
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Shenzhen Graduate School Harbin Institute of Technology
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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
    • C02F1/44—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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds

Abstract

The invention discloses a method for treating micro-polluted water, which adopts ferrous ion Fe2+The combined process of oxidation/micro-flocculation combined with filtration of the dissolved oxygen activated dithionite for treating the micro-polluted water comprises the following steps: (1) treating by adopting an oxidation/micro-flocculation unit: firstly, adding Fe containing ferrous ions into micro-polluted raw water2+Adding dithionite, regulating pH value and temp. by using ferrous ion Fe2+Activating dithionite by dissolved oxygen in a combined water body to carry out organic matter pre-oxidation and ferric salt flocculation treatment; (2) and (3) processing by adopting a filtering unit: and (3) filtering the effluent obtained in the step (1) to further remove pollutants in the water body. The method is based on a novel sulfate radical advanced oxidation system of dithionite, has high oxidation efficiency, has the function of a flocculating agent of iron salt, and has the effects of oxidation and coagulationThe method has the advantages of mild reaction conditions, greenness, high efficiency, convenient operation and management and low cost.

Description

Method for treating micro-polluted water
Technical Field
The invention belongs to the technical field of sewage treatment, particularly relates to a method for treating micro-polluted water, and particularly relates to a method for treating micro-polluted water by using ferrous ions Fe2+Combined treatment process of micro polluted water combined with oxidation/micro flocculation of dissolved oxygen activated dithionite combined with filtration.
Background
In the process of industrial development and urban scale enlargement, pollutants discharged from human domestic and industrial water cause serious pollution to the water environment. The micro-polluted water has the characteristics of multiple pollutant types, complex water quality, low concentration, stable chemical structure, long half-life period and the like, wherein the proportion of organic pollutants is large and is mainly divided into two types, one type is a Natural Organic Matter (NOM) with a complex structure and a large molecular weight, the other type is a micro-pollutant which has strong physiological toxicity and a small molecular weight and is difficult to effectively remove by a conventional process, and the concentration of the micro-pollutant in the water is extremely low and is generally from several ng/L to dozens of mu g/L. For micro-polluted raw water with increasingly complex and various pollutant concentrations and types, the conventional coagulation-precipitation-filtration treatment process cannot effectively treat the micro-polluted raw water.
In order to improve the treatment effect, a pre-oxidation unit is usually added, so that the degradation efficiency of the refractory organic matters can be improved on one hand, the coagulating sedimentation effect can be improved on the other hand, the filtering time of the filter tank is reduced, and the method has strong application potential.
The common preoxidation technology at the present stage mainly comprises chemical oxidation, Fenton advanced oxidation and the like, wherein the chemical oxidation is generally limited by insufficient oxidation capacity, and the Fenton advanced oxidation has stronger oxidation capacity under an acidic condition and has larger limitation on the application.
Disclosure of Invention
The invention aims to provide a method for treating micro-polluted water, which adopts ferrous ion Fe2+The combined process of oxidation/micro-flocculation combined filtration of the dithionite activated by combined dissolved oxygen treats the micro-polluted water, and a novel sulfate radical free radical advanced oxidation system based on the dithionite has high oxidation efficiency, ferric salt has the function of a flocculating agent, and has oxidation and coagulation effects, mild reaction conditions, greenness and high efficiency, convenient operation and management and low cost.
The above object of the present invention can be achieved by the following technical solutions: a process for treating the slightly polluted water by ferrous ion Fe2+The combined process of oxidation/micro-flocculation combined filtration of the combined dissolved oxygen activated dithionite for treating the micro-polluted water specifically comprises the following steps:
(1) treating by adopting an oxidation/micro-flocculation unit: comprises adding Fe containing ferrous ions into micro-polluted raw water2+Adding dithionite, regulating pH value and temp. by using ferrous ion Fe2+Activating dithionite by dissolved oxygen in a combined water body to carry out organic matter pre-oxidation and ferric salt flocculation treatment;
(2) and (3) processing by adopting a filtering unit: the method comprises the step of treating the effluent water obtained in the step (1) by adopting a filtering unit to further remove pollutants in the water body.
The invention adopts dithionite advanced oxidation technology in a pre-oxidation unit of a combined process, and compared with the traditional hydroxyl radical (. OH) advanced oxidation system, sulfate radical (SO) radical4·-) The half-life period is longer, the action time is longer, the standard oxidation-reduction potential is 2.5V, and the standard oxidation-reduction potential is similar to that of strong oxidizing OH. In addition, studies have found that, under neutral conditions, SO4·-Even if the oxidation-reduction potential of the catalyst is higher than OH, most of the organic pollutants which are difficult to degrade can be treated by SO4·-And (4) degrading.
The oxidation/micro flocculation unit in the step (1) and the filtration unit in the step (2) are sequentially connected.
Wherein the oxidation/micro-flocculation unit adopts Fe2+The high-level oxidation method of the dithionite is activated by combining dissolved oxygen, so that the high-efficiency degradation of organic matters in slightly polluted water is realized, and other pollutants such as suspended matters in water are treated by utilizing the flocculation effect of ferric salt; the effluent water directly enters a filtering unit to further remove residual pollutants.
In the above-described method for treating slightly polluted water of the present invention:
the oxidation/micro-flocculation unit in the step (1) of the invention adopts Fe2+Carrying out pre-oxidation treatment by combining with a dissolved oxygen activated dithionite advanced oxidation system, and taking dithionite as SO4 ·-In the presence of Fe2+Under the combined dissolved oxygen activation, pollutants such as organic matters, ammonia nitrogen and the like in water can be effectively oxidized, and meanwhile, ferric salt can be used as a flocculating agent to synchronously realize the flocculation removal of the pollutants.
The oxidation/micro-flocculation process of the present invention can be controlled by controlling the Fe2+And dithionite adding amount, solution pH, reaction temperature, reaction time and other conditions, so that the oxidation efficiency is effectively improved. Wherein Fe2+Meanwhile, the flocculant has the function of strengthening coagulation and flocculation.
Preferably, the ferrous ion Fe in the ferrous salt in the step (1)2+With S in said dithionite2O4 2-In a molar ratio of 1: 10-5: 1.
preferably, the iron ions Fe contained in the step (1)2+The ferrous salt comprises one or more of ferrous sulfate, ammonium ferrous sulfate and ferrous chloride.
Preferably, the dithionite used in step (1) is dithionite containing dithionite radical (S)2O4 2-) The salt of (A), the salt containing dithionite (S)2O4 2-) The salt of (A) is one or more of sodium hydrosulfite, potassium hydrosulfite and ammonium hydrosulfite.
Preferably, the pH value in the step (1) is 4.0-9.0.
Therefore, the method of the invention not only is an advanced oxidation technology under an acidic condition, but also is an advanced oxidation technology under a neutral-alkalescent condition, and can improve the treatment capacity of the combined process to pollutants in slightly polluted water, widen the application range of the oxidation/micro-flocculation unit and avoid the need of regulating the pH value again in the application process when the slightly polluted water is subjected to pre-oxidation treatment.
Preferably, the temperature in the step (1) is 15-50 ℃.
Preferably, the treatment time of the oxidation/micro-flocculation unit adopted in the step (1) is 30-120 min.
Preferably, the concentration of the dissolved oxygen in the water body in the step (1) is 4.5-7.5 mg/L, and the dissolved oxygen in the water body provides oxygen for the reaction.
Preferably, the micro-polluted raw water in the step (1) is a water body with organic matters and ammonia nitrogen as main pollutants, and mainly comprises water source water and tail water of a sewage treatment plant.
The micro-polluted raw water has the characteristics of low environmental concentration, difficult decomposition, strong durability, biological accumulation and the like.
Preferably, the filtration unit in step (2) comprises sand filtration and/or membrane filtration.
Preferably, the membrane filtration includes microfiltration, ultrafiltration and low-pressure nanofiltration, the membrane material includes organic and/or inorganic hydrophobic membrane material, and the membrane material is one or a combination of several of polyvinylidene fluoride (PVDF), polypropylene (PP), Polytetrafluoroethylene (PTFE), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyvinylidene fluoride-chlorotrifluoroethylene copolymer (PVDF-CTFE) and ceramic material.
Through further treatment of the filtering unit, pollutants in water can be removed, and the deep removal of SS, organic matters and the like is realized.
Compared with the prior art, the invention has the following beneficial effects:
(1) fe in the invention2+The combined dissolved oxygen activated dithionite oxidation/micro flocculation unit adopts a novel sulfate radical advanced oxidation system based on dithionite, and has wider pH application range;
(2) fe in the invention2+The dithionite oxidation/micro-flocculation unit activated by combined dissolved oxygen can effectively degrade organic pollutants in water, and the used ferric salt has the function of a flocculating agent and has the effects of oxidation and coagulation, so that the occupied area of a treatment facility is saved;
(3) the combined process flow in the invention is simple, the operation and management are convenient, and the treatment and operation cost is reduced;
(4) therefore, the method can destroy the pollutant structure in the micro-polluted raw water, realize the conversion and removal of the pollutant, simultaneously effectively improve the coagulation effect by the ferric salt, strengthen the treatment capacity of the micro-polluted raw water, have the advantages of mild reaction conditions, greenness, high efficiency, easy operation and the like, and have great application potential in the field of water treatment.
Detailed Description
The method of the present invention is further illustrated by the following examples. The following examples are for illustrative purposes only and are not to be construed as limiting the invention. The reagents or materials used in the examples, if not specifically mentioned, were commercially available, and the equipment used in the following examples, if not specifically mentioned, was conventional in the art.
Example 1
By using the Fe provided by the invention2+The combined dissolved oxygen activated dithionite oxidation/micro flocculation-sand filtration process is used for treating the slightly polluted source water, the concentration of chlorophyll a in raw water is about 55 mu g/L, the concentrations of Total Organic Carbon (TOC) and ammonia nitrogen are about 4.5mg/L and 0.9mg/L respectively, the turbidity is about 9.45NTU, and the pH value of the solution is about 7.5. The initial pH value of the reaction is not adjusted in the treatment process, and the reaction atmosphere condition is not controlled, so that the raw water is subjected to sequencing batch treatment.
Wherein FeSO is added in the treatment process of the oxidation/micro-flocculation unit4Solution and Na2S2O4The solution concentration is 15mmol/L and 60mmol/L respectively, the reaction is carried out for 90min at the temperature of 30 ℃, and then the effluent is filtered by using a common sand filter column.
The TOC and ammonia nitrogen concentration in the filtered effluent is about 3.0mg/L and 0.1mg/L, the degradation rate is about 33.3 percent and 88.9 percent respectively, the total nitrogen concentration of the effluent is about 0.8mg/L, chlorophyll a is not detected, and the effluent contains chlorophyll aFe2+And SO4 2-The concentration is respectively about 0.1mg/L and 25mg/L, which are both lower than the water quality standard limit value of the surface water source of the drinking water.
The TOC and ammonia nitrogen concentration in the water source water treated by the combined process can be effectively reduced, the total nitrogen concentration is slightly reduced mainly because the dithionite can reduce trace nitrate into nitrogen, and simultaneously Fe in the effluent water2+And SO4 2-The concentration also meets the water quality standard of the water source area.
Example 2
By using the Fe provided by the invention2+The combined dissolved oxygen activated dithionite oxidation/micro flocculation-sand filtration process is used for treating the slightly polluted source water, the concentration of chlorophyll a in raw water is about 55 mu g/L, the concentrations of Total Organic Carbon (TOC) and ammonia nitrogen are about 4.5mg/L and 0.9mg/L respectively, the turbidity is about 9.45NTU, and the pH value of the solution is about 7.5. In the treatment process, the reaction atmosphere condition is not controlled, and the raw water is treated in a sequencing batch mode.
Wherein FeSO is added in the treatment process of the oxidation/micro-flocculation unit4Solution and Na2S2O4The solution concentrations are 150mmol/L and 30mmol/L respectively, the initial pH is adjusted to 9.0 before the treatment is started, the reaction is carried out for 120min at the temperature of 50 ℃, and then the effluent is filtered by using common sand filtration.
The TOC and ammonia nitrogen concentration in the filtered effluent is about 3.4mg/L and 0.12mg/L, the degradation rate is about 24.4 percent and 86.7 percent respectively, the total nitrogen concentration of the effluent is about 0.83mg/L, chlorophyll a is not detected, and Fe in the effluent is2+And SO4 2-The concentration is respectively about 0.08mg/L and 30mg/L, which are both lower than the water quality standard limit value of the surface water source of the drinking water.
The TOC and ammonia nitrogen concentration in the source water can be effectively reduced after the treatment of the combined process, and simultaneously the Fe in the outlet water2+And SO4 2-The concentration also meets the water quality standard of the water source area.
As is clear from the results of comparative example 1, when the initial pH of the reaction was high, Fe was added2+When the concentration is increased, the capability of removing TOC and ammonia nitrogen in raw water by oxidizing sodium bisulfite is weakened, and more floccules are generated in the reaction process, so that the cleaning frequency of the sand filter column is increased.
Example 3
By using the Fe provided by the invention2+The combined dissolved oxygen activated dithionite oxidation/micro flocculation-sand filtration process is used for treating the slightly polluted source water, the concentration of chlorophyll a in raw water is about 55 mu g/L, the concentrations of Total Organic Carbon (TOC) and ammonia nitrogen are about 4.5mg/L and 0.9mg/L respectively, the turbidity is about 9.45NTU, and the pH value of the solution is about 7.5. In the treatment process, the reaction atmosphere condition is not controlled, and the raw water is treated in a sequencing batch mode.
Wherein FeSO is added in the treatment process of the oxidation/micro-flocculation unit4Solution and Na2S2O4The solution concentrations were 6mmol/L and 60mmol/L, respectively, the initial pH was adjusted to 4.0 before the start of the treatment, the reaction was carried out at 15 ℃ for 30min, and then the effluent was filtered using ordinary sand filtration.
The TOC and ammonia nitrogen concentration in the filtered effluent is about 3.9mg/L and 0.2mg/L, the degradation rate is about 13.3 percent and 77.8 percent respectively, the total nitrogen concentration of the effluent is about 0.7mg/L, chlorophyll a is not detected, and Fe in the effluent is2+And SO4 2-The concentration is respectively about 0.21mg/L and 30mg/L, which are both lower than the water quality standard limit value of the surface water source of the drinking water.
The TOC and ammonia nitrogen concentration in the water source water treated by the combined process can be effectively reduced, the total nitrogen concentration is slightly reduced mainly because the dithionite can reduce trace nitrate into nitrogen, and simultaneously Fe in the effluent water2+And SO4 2-The concentration also meets the water quality standard of the water source area.
The results of comparative example 1 show that the flocculation in the dithionite oxidation/micro-flocculation unit is weakened due to the low ferrous content, the TOC is basically treated by dithionite oxidation, and the service life of the sand filter column is prolonged due to the low floccule generation.
Example 4
By using the Fe provided by the invention2+The tail water of a sewage treatment plant is treated by combining a dissolved oxygen activated dithionite oxidation/micro flocculation-sand filtration combined process, the Chemical Oxygen Demand (COD) and ammonia nitrogen concentration in raw water are respectively about 25mg/L and 3.0mg/L, and the pH value of the solution is about 7.5. Without adjusting the inverse during the treatmentThe raw water is treated in a sequencing batch mode under the condition of initial pH and no control of reaction atmosphere.
Wherein FeSO is added in the treatment process of the oxidation/micro-flocculation unit4Solution and Na2S2O4The solution concentration is 15.625mmol/L and 62.5mmol/L respectively, the reaction is carried out for 90min at the temperature of 30 ℃, and then the effluent is filtered by using a common sand filter column.
The COD and ammonia nitrogen concentration in the filtered effluent is about 12mg/L and 0.1mg/L, the degradation rate is about 52.0 percent and 96.7 percent respectively, the total nitrogen concentration of the effluent is about 2.8mg/L, and the Fe concentration in the effluent2+And SO4 2-The concentrations were about 0.1mg/L and 25mg/L, respectively.
After the treatment of the combined process, the COD and the ammonia nitrogen concentration in the source water can be effectively reduced.
Comparative example 1
Respectively adopting Fe provided by the invention2+The slightly polluted source water is treated by combining the dissolved oxygen activated dithionite oxidation/micro flocculation-sand filtration and dithionite oxidation/micro flocculation-microfiltration combined process, the concentration of chlorophyll a in raw water is about 55 mu g/L, the concentration of Total Organic Carbon (TOC) and ammonia nitrogen are about 4.5mg/L and 0.9mg/L respectively, the turbidity is about 9.45NTU, and the pH value of the solution is about 7.5. The initial pH value of the reaction is not adjusted in the treatment process, and the reaction atmosphere condition is not controlled, so that the raw water is subjected to sequencing batch treatment.
Wherein FeSO is added simultaneously in the treatment process of the oxidation/micro-flocculation unit in the two groups of experiments4Solution and Na2S2O4The solution concentration is 15mmol/L and 60mmol/L respectively, the reaction is carried out for 90min at the temperature of 30 ℃, and then the effluent is filtered by using common sand filtration and nanofiltration membrane respectively.
Wherein the indexes of the effluent after filtration in the sand filtration experimental group are shown in the results in example 1, the TOC and ammonia nitrogen concentrations of the effluent in the microfiltration membrane experimental group are about 2.9mg/L and 0.25mg/L, the degradation rates are about 35.5 percent and 72.2 percent respectively, and the total nitrogen concentration of the effluent is about 0.86 mg/L.
The variation of TOC concentration in two groups of experimental results is not big, the difference of ammonia nitrogen treatment efficiency is obvious, and the micro-filtration membrane can not intercept micromolecular ammonia nitrogen and is slightly lower than the experimental results of a sand filtration group mainly because fillers such as natural ores in the sand filtration column possibly have weak adsorption effect on the ammonia nitrogen.
The above embodiments are only used for illustrating the present invention, and the scope of the present invention is not limited to the above embodiments. The object of the present invention can be achieved by those skilled in the art based on the above disclosure, and any improvements and modifications based on the concept of the present invention fall within the protection scope of the present invention, which is defined by the claims.

Claims (10)

1. A process for treating the slightly polluted water features use of ferrous ion Fe2+The combined process of oxidation/micro-flocculation combined filtration of the combined dissolved oxygen activated dithionite for treating the micro-polluted water specifically comprises the following steps:
(1) treating by adopting an oxidation/micro-flocculation unit: comprises adding Fe containing ferrous ions into micro-polluted raw water2+Adding dithionite, regulating pH value and temp. by using ferrous ion Fe2+Activating dithionite by dissolved oxygen in a combined water body to carry out organic matter pre-oxidation and ferric salt flocculation treatment;
(2) and (3) processing by adopting a filtering unit: the method comprises the step of treating the effluent water obtained in the step (1) by adopting a filtering unit to further remove pollutants in the water body.
2. The method for treating micro-polluted water according to claim 1, wherein: ferrous ion Fe in the ferrous salt in the step (1)2+With S in said dithionite2O4 2-In a molar ratio of 1: 10-5: 1.
3. the method for treating micro-polluted water according to claim 1 or 2, wherein: the Fe ions containing ferrous ions in the step (1)2+The ferrous salt comprises one or more of ferrous sulfate, ammonium ferrous sulfate and ferrous chloride.
4. The micropollution of claim 1 or 2The treatment method of the dyeing water is characterized by comprising the following steps: the dithionite in the step (1) is dithionite containing dithionite radical (S)2O4 2-) The salt of (A), the salt containing dithionite (S)2O4 2-) The salt of (A) is one or more of sodium hydrosulfite, potassium hydrosulfite and ammonium hydrosulfite.
5. The method for treating micro-polluted water according to claim 1, wherein: in the step (1), the pH value is 4.0-9.0, and the temperature is 15-50 ℃.
6. The method for treating micro-polluted water according to claim 1, wherein: in the step (1), the treatment time of the oxidation/micro-flocculation unit is 30-120 min.
7. The method for treating micro-polluted water according to claim 1, wherein: the concentration of the dissolved oxygen in the water body in the step (1) is 4.5-7.5 mg/L.
8. The method for treating micro-polluted water according to claim 1, wherein: the micro-polluted raw water in the step (1) is a water body with organic matters and ammonia nitrogen as main pollutants, and mainly comprises water source water and tail water of a sewage treatment plant.
9. The method for treating micro-polluted water according to claim 1, wherein: the filtering unit in the step (2) comprises sand filtering and/or membrane filtering.
10. The method for treating micro-polluted water according to claim 9, wherein: the membrane filtration comprises microfiltration, ultrafiltration and low-pressure nanofiltration, the membrane material comprises an organic and/or inorganic hydrophobic membrane material, and the membrane material is one or a combination of several of polyvinylidene fluoride (PVDF), polypropylene (PP), Polytetrafluoroethylene (PTFE), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyvinylidene fluoride-chlorotrifluoroethylene copolymer (PVDF-CTFE) and a ceramic material.
CN202010842947.2A 2020-08-20 2020-08-20 Method for treating micro-polluted water Pending CN112158976A (en)

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