CN112624298B - Advanced treatment process and system for sewage - Google Patents

Advanced treatment process and system for sewage Download PDF

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CN112624298B
CN112624298B CN202011608354.6A CN202011608354A CN112624298B CN 112624298 B CN112624298 B CN 112624298B CN 202011608354 A CN202011608354 A CN 202011608354A CN 112624298 B CN112624298 B CN 112624298B
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CN112624298A (en
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刘杨
赖波
张恒
周鹏
袁月
熊兆锟
何传书
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Sichuan University
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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic 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
    • C02F2101/101—Sulfur 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
    • C02F2101/30—Organic 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
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/06—Nutrients for stimulating the growth of microorganisms

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Abstract

According to the sewage treatment process provided by the embodiment of the invention, the aerobic oxidation process and the anoxic reduction process are combined, the original sewage firstly enters an oxygen consumption stage, reducing substances and refractory organic pollutants in the original sewage are removed under the action of persulfate and sulfite, and then the original sewage enters an anoxic stage; in an anoxic environment, the residual persulfate in the sewage is subjected to a reduction reaction under the catalytic action of the Fe and B modified carbon-based material to remove dissolved nitrates in the sewage, and purified effluent is obtained. By adopting the sewage treatment process provided by the embodiment of the invention, after the oxidation reaction is carried out, the residual persulfate is further utilized for carrying out the reduction reaction, so that the persulfate is fully utilized, and the cost of sewage deep treatment is reduced; moreover, reducing substances, refractory organics and soluble nitrates in the sewage can be synchronously removed, COD, TN and refractory organics of the sewage are effectively reduced, and the effluent index of the sewage is improved.

Description

Advanced treatment process and system for sewage
Technical Field
The invention relates to the field of sewage treatment, and mainly relates to a sewage advanced treatment process and system.
Background
Refractory organic pollutants in water environment (such as drugs and personal care products (PPCPs), pesticides, environmental Estrogens (EDCs), antibiotics and the like) have the obvious characteristics of low concentration, great harm and difficult removal, are easy to induce the disorder of the endocrine system of a human body, and are typical substances causing mutation, carcinogenesis and teratogenesis.
In the prior art, the conventional activated sludge sewage treatment process has very limited removal capacity for the substances, and needs to carry out advanced treatment at the tail end of the sewage treatment process. The traditional chemical oxidation advanced treatment technology, such as potassium permanganate method, Fenton and similar Fenton method, ozone oxidation method and the like, has the defects of low organic matter removal efficiency, secondary pollution, complex process, high investment and operation cost and the like.
In addition, the current sewage treatment industry still faces the problem of improving the effluent index of sewage, and the mode of combining the traditional secondary biochemical treatment process (such as traditional CASS, oxidation ditch, AAO and SBR) with the common advanced treatment process (such as flocculation, sedimentation and filter tank) in the industry cannot meet the new requirements of the sewage treatment in the whole country, province, city and future cities.
In summary, there is a need to develop a novel, economical, efficient and environment-friendly advanced treatment process for municipal sewage, which can solve the problem of pollution of refractory organic matters in sewage and can improve the effluent index of sewage.
Disclosure of Invention
The invention provides a sewage advanced treatment process and a sewage advanced treatment system for solving the problems, which aim to solve the practical engineering problems of difficult improvement of the sewage quality, low removal efficiency of the organic pollutants difficult to degrade in water and high sewage treatment cost of a membrane process. The purpose of completing the advanced treatment of the sewage by an economic and efficient method is achieved.
In a first aspect, the invention provides a process for the advanced treatment of wastewater, the process comprising the steps of:
step 1: firstly, raw sewage enters an oxygen consumption stage, persulfate and sulfite are respectively added through a dosing device, reducing substances and refractory organic pollutants in the raw sewage are removed, and primarily purified sewage is obtained and enters an anoxic stage;
step 2: after the primarily purified sewage enters an anoxic stage, in an anoxic environment, carrying out reduction reaction on the residual persulfate in the primarily purified sewage and the dissolved nitrate in the primarily purified sewage under the catalytic action of the Fe and B modified carbon-based material to obtain purified effluent, wherein the quality of the effluent stably reaches the standard of surface quasi-IV water.
Preferably, the sulfite activates the persulfate to provide SO4 -By said.SO4 -And (3) oxidizing the reducing substances and the organic pollutants which are difficult to degrade, and removing the reducing substances and the organic pollutants which are difficult to degrade in the original sewage.
Preferably, the factors determining the input amount of the persulfate include: the amount of the raw sewage, the amount of reducing substances in the raw sewage, the amount of refractory organic pollutants in the raw sewage and the amount of dissolved nitrates in the raw sewage.
Preferably, the ratio of the sulfite to the persulfate is as follows: 1:100-100:1.
Preferably, the dissolved oxygen in the primarily purified wastewater is less than 1.0 mg/L; the content of the persulfate in the primarily purified sewage is 30-65% of the initial addition amount of the persulfate.
Preferably, in the step 2, the persulfate remaining in the primarily purified sewage is subjected to a reduction reaction with the dissolved nitrate in the primarily purified sewage under the catalytic action of the Fe and B modified carbon-based material, and the reduction reaction comprises:
the residual persulfate is activated into S under the catalytic action of the Fe and B modified carbon-based material2O8 -(ii) a Said S2O8 -And the nitrate in the sewage and the dissolved nitrate in the sewage are subjected to reduction reaction.
In a second aspect, the present invention provides an advanced wastewater treatment system for carrying out the process of any one of the first aspects, the system comprising: an oxygen depletion phase, an anoxic phase.
Preferably, the oxygen consumption stage and the oxygen deficiency stage are the same sewage treatment area built up and down, or the oxygen consumption stage and the oxygen deficiency stage are two separated sewage treatment areas.
Preferably, when the oxygen consumption stage and the oxygen deficiency stage are the same sewage treatment zone which is built up and down, the sewage treatment zone comprises an upper oxygen consumption reaction zone and a lower oxygen deficiency reaction zone, and the lower oxygen deficiency reaction zone is filled with the Fe and B modified carbon-based material in a fixed bed manner.
The sewage treatment process provided by the embodiment of the invention combines an aerobic oxidation process and an anoxic reduction process, and specifically comprises the following steps: the method comprises the following steps that (1) raw sewage firstly enters an oxygen consumption stage, reducing substances and refractory organic pollutants in the raw sewage are removed under the action of persulfate and sulfite to obtain primarily purified sewage, and the primarily purified sewage then enters an oxygen-deficient stage; in the anoxic stage, the persulfate remained in the primarily purified sewage is subjected to reduction reaction under the catalytic action of the Fe and B modified carbon-based material to remove dissolved nitrate in the sewage, so as to obtain purified effluent.
By adopting the sewage treatment process provided by the embodiment of the invention, the aerobic oxidation process and the anoxic reduction process are combined, so that reducing substances, refractory organic matters and soluble nitrate in the sewage can be synchronously removed, the COD (chemical oxygen demand), TN (total nitrogen) and refractory organic matters of the sewage are effectively reduced, the effluent index of the sewage is improved, and the effluent quality stably reaches the surface level IV water standard.
In the embodiment of the application, the original sewage is firstly subjected to oxidation reaction in an aerobic state of the sewage to remove reducing substances and refractory organic matters in the sewage, and oxygen in the sewage is consumed in the process, so that the sewage is in an anoxic state (even an anoxic state); and then entering an anoxic stage, activating the residual peroxydisulfate into reductive persulfate free radicals in an anoxic or even anaerobic state, and reducing the nitrate in the sewage by using the persulfate free radicals so as to purify the nitrate in the sewage and fully utilize the peroxydisulfate to achieve the purpose of reducing the cost of advanced sewage treatment.
In the embodiment of the application, sulfite is used for catalyzing the activation of the peroxydisulfate to carry out oxidation reaction, so that the condition that metal ions and compounds thereof commonly used in the prior art are used for catalyzing the activation of the peroxydisulfate is avoided.
In the embodiment of the application, the Fe and B modified carbon-based materials are used as catalysts to catalyze the reaction in the anoxic stage, so that the residual peroxydisulfate in the oxygen consumption stage can be effectively utilized, and the utilization efficiency of the oxidant (peroxydisulfate) is improved; in the stage, the peroxodisulfate is catalyzed by Fe and B modified carbon-based materials to generate SO with strong reducibility8 2-Can reduce the nitrate nitrogen remained in the sewage and further improve the quality of the effluent of the sewage.
Drawings
FIG. 1 is a process flow diagram of an advanced wastewater treatment process according to an embodiment of the present invention;
fig. 2 is a schematic view of an advanced wastewater treatment system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Peroxydisulfate (PDS) (hereinafter persulfate) is readily soluble in water to form a strongly oxidizing persulfate ion S2O8 2-，S2O8 2-Can be activated into SO under the action of heat, Ultraviolet (UV), ionizing radiation or other chemical electron transfer (such as transition metal ions and compounds thereof, nonmetal catalysis, etc.)4 -，·SO4 -The standard oxidation-reduction potential (E0 ═ 2.5-3.1V) of the organic acid is close to or even exceeds that of hydroxyl free radical (. OH, E0 ═ 2.8V), the organic acid has strong oxidizing capability, most of organic matters can be oxidized into small molecular organic acid, and finally the organic acid is completely mineralized to generate CO2And H2O，·SO4 -The reaction mechanisms with organic substances are mainly electron transfer, addition/elimination and hydrogen extraction.
In practice, based on sulfate radicals (. SO)4 -) Compared with other traditional chemical oxidation technologies, the advanced oxidation technology has the advantages of strong oxidation capacity, mild reaction, moderate price and long-term stable existence in soil and underground water.
In the common sewage treatment process flow, transition metal ions and compounds thereof are generally adopted to catalyze PDS to generate SO through activation4 -The method is used for purifying the sewage and removing the reducing substances in the sewage, but the transition metal ions and the compounds thereof are adopted for catalysis, so that the metal ions are dissolved out and influence exists, and secondary pollution is caused to the purified sewage.
Therefore, the inventors have searched for the activation of PDS to form SO4 -The inventor discovers that the sulfite can catalyze the persulfate to generate SO by homogeneous catalysis under aerobic conditions4 -The principle is as follows:
Figure BDA0002870873660000051
2S2O8 2-+2HSO3 -+2H2O→6·SO3 -+3·O2 -+6H+
·SO3 -+·O2 -→SO5 2-
SO5 2-+H+→·SO4 -+·OH
thus, the sulfite can be effectively activatedPDS to SO4 -，·SO4 -Can remove reducing substances and refractory organic pollutants in water by oxidation, can quickly consume oxygen in water, and can generate SO by uniformly catalyzing persulfate activation by sulfite4 -Can avoid the metal ions dissolving out caused by the catalytic activation of PDS by using metal ions and compounds thereof and the secondary pollution to the purified sewage.
In addition, the denitrification biofilter adopted in the existing sewage treatment process is high in cost and is difficult to meet the current requirement on TN in the new standard of urban sewage treatment.
Therefore, the inventor searches a method for treating soluble nitrate in sewage, and the inventor finds that PDS can be activated to generate persulfate radicals (S) with strong reducibility under the catalysis of a carbon-based material under the anoxic condition2O8 -) The principle is as follows:
Figure BDA0002870873660000052
Figure BDA0002870873660000053
Figure BDA0002870873660000054
Figure BDA0002870873660000055
Figure BDA0002870873660000056
Figure BDA0002870873660000057
Figure BDA0002870873660000058
·S2O8 -can rapidly reduce difficult-to-oxidize substances (such as halogenated hydrocarbon), and further the inventor further explores and discovers that: s2O8 -Can reduce the soluble nitrate in the sewage, and the principle is as follows:
Figure BDA0002870873660000059
Figure BDA00028708736600000510
in addition, in the existing sewage treatment process, an excessive amount of oxidant is usually added in the advanced oxidation treatment stage, so that the oxidant is remained, and the oxidant cannot be fully utilized.
Based on the above discovery, the inventive concept of the present application is proposed: catalyzing persulfate by sulfite to obtain SO4 -Removing reducing substances and refractory organic matters in the sewage to reduce COD, consuming dissolved oxygen in the sewage due to oxygen consumption in the reaction process to ensure that the sewage after the reaction is in an anoxic state, and ensuring that the residual persulfate in the sewage after the reaction and the residual persulfate in the sewage in the anoxic state are catalyzed by a carbon-based material under the anoxic condition due to excessive initial persulfate to obtain S2O8 -So that reduction reaction is carried out to remove soluble nitrate in the sewage and reduce TN of the sewage.
Based on the above inventive concept, the first aspect of the present invention provides a process for advanced treatment of wastewater, which is described below with reference to fig. 1, and the process comprises the following steps:
s110: step 1: firstly, raw sewage enters an oxygen consumption stage, persulfate and sulfite are respectively added through a dosing device, reducing substances and refractory organic pollutants in the raw sewage are removed, and primarily purified sewage is obtained and enters an anoxic stage;
s120: step 2: after the primarily purified sewage enters an anoxic stage, in an anoxic environment, carrying out reduction reaction on the residual persulfate in the primarily purified sewage and the dissolved nitrate in the primarily purified sewage under the catalytic action of the Fe and B modified carbon-based material to obtain purified effluent, wherein the quality of the effluent stably reaches surface quasi-IV water.
In a specific embodiment, in step 1, the sulfite activates the persulfate to provide SO4 -By said.SO4 -And (3) oxidizing the reducing substances and the organic pollutants which are difficult to degrade, and removing the reducing substances and the organic pollutants which are difficult to degrade in the original sewage.
In step 1, the factors for determining the input amount of the persulfate include: the amount of the raw sewage, the amount of reducing substances in the raw sewage, the amount of refractory organic pollutants in the raw sewage and the amount of dissolved nitrates in the raw sewage.
In specific implementation, the required amount of sodium persulfate to be added can be calculated according to the volume of the raw sewage to be treated, the amount of the reducing substances, the amount of the refractory organic pollutants and the amount of the dissolved nitrates in the sewage.
Wherein, when concrete implementation, can utilize the national standard method to detect the COD value of sewage for embody the content of reducing substance in the sewage, in the reality, difficult degradation organic pollutant in the sewage mainly includes: typical environmental estrogens (estrone, estradiol, bisphenol A, bisphenol S and the like) and fluoroquinolone antibiotics (levofloxacin, ciprofloxacin, gatifloxacin, norfloxacin, enrofloxacin and the like), so that the content of the estrogen and the fluoroquinolone antibiotics in the sewage can be measured by using liquid chromatography in specific implementation so as to reflect the amount of organic pollutants difficult to degrade in the sewage. On toolIn practice, TN value in sewage can be detected by using a national standard method, or NO can be measured by using ion chromatography3 -、NO2 -Is used for reflecting the amount of the nitrate in the dissolved state in the sewage. And finally, calculating the amount of the sodium persulfate to be added according to the measured amount of the reducing substances, the measured amount of the refractory organic pollutants and the measured amount of the dissolved nitrate in the sewage.
In another embodiment of the present application, an excess of persulfate is added in step 1 such that the residual persulfate content is 30% to 65% of the initial addition after the end of the oxygen-consuming stage reaction.
In specific implementation, in step 1, the ratio of the sulfite to the persulfate to be added is as follows: 1:100-100:1.
After the reaction in the oxygen consumption stage is finished, the dissolved oxygen in the primarily purified sewage is less than 1.0 mg/L. And then, the sewage after primary purification enters an anoxic zone, and the reaction of the step 2 is carried out in the anoxic zone.
In the step 2, the persulfate remaining in the primarily purified sewage is subjected to a reduction reaction with the dissolved nitrate in the primarily purified sewage under the catalytic action of the Fe and B modified carbon-based material, and the reduction reaction comprises: the residual persulfate is activated into S under the catalytic action of the Fe and B modified carbon-based material2O8 -(ii) a Said S2O8 -And the nitrate in the sewage and the dissolved nitrate in the sewage are subjected to reduction reaction.
In the specific implementation, the residual PDS in the sewage after the primary purification is adsorbed on the surface of the Fe and B modified carbon-based material under the anoxic condition, and the reductive S is generated by catalysis2O8 -。·S2O8 -And the nitrate and the dissolved nitrate in the sewage are subjected to reduction reaction, so that the dissolved nitrate in the sewage is removed, and the TN value of the sewage is reduced.
In the invention, the quality of the purified effluent after the two-step treatment can stabilize the standard of surface standard IV water.
By adopting the sewage treatment process provided by the embodiment of the invention, the aerobic oxidation process and the anoxic reduction process are combined, so that reducing substances, refractory organic matters and soluble nitrate in the sewage can be synchronously removed, the COD (chemical oxygen demand), TN (total nitrogen) and refractory organic matters of the sewage are effectively reduced, the effluent index of the sewage is improved, and the effluent quality stably reaches the surface level IV water standard.
In the embodiment of the application, the oxidation reaction is firstly carried out in the oxygen consumption stage, oxygen is consumed in the reaction process, so that the sewage after the reaction is in an anoxic state (even an anoxic state), then the anoxic stage is carried out, and the residual PDS carries out the reduction reaction under the anoxic condition, so that the persulfate is fully utilized, and the cost of the advanced sewage treatment is reduced.
In the embodiment of the application, the persulfate is activated by catalyzing sulfite to perform oxidation reaction, so that the persulfate is not activated by catalyzing metal ions and compounds thereof commonly used in the prior art, and no metal ions are dissolved out in the reaction process, so that secondary pollution to sewage is avoided.
In the embodiment of the application, the Fe and B modified carbon-based materials are used as catalysts to catalyze the reaction in the anoxic stage, so that the residual peroxydisulfate in the oxygen consumption stage can be effectively utilized, and the utilization efficiency of the oxidant (peroxydisulfate) is improved; in the stage, the peroxodisulfate is catalyzed by Fe and B modified carbon-based materials to generate SO with strong reducibility8 2-Can reduce the nitrate nitrogen remained in the sewage and further improve the quality of the effluent of the sewage.
Based on the above inventive concept, the second aspect of the present invention provides an advanced wastewater treatment system for performing the process of the first aspect of the present application, the system comprising: an oxygen depletion phase, an anoxic phase. And carrying out oxidation reaction in an oxygen consumption stage to remove reducing substances and refractory organic pollutants in the sewage, consuming oxygen, and carrying out reduction reaction on the sewage subjected to primary purification in the oxygen consumption stage to remove soluble nitrate in the sewage in an anoxic stage.
In one embodiment of the present application, the oxygen consumption stage and the oxygen deficiency stage are the same sewage treatment area which is constructed up and down, the sewage treatment area comprises an upper oxygen consumption stage and a lower oxygen deficiency stage, and the lower oxygen deficiency stage is filled with the Fe and B modified carbon-based material in a fixed bed manner.
In practical application, sulfite and persulfate are added into the sewage treatment zone while the sewage enters the sewage treatment zone, and the intermittent oxygenation is performed, wherein the oxygenation method can adopt any one method in the prior art, and the invention is not limited to this.
After the reaction in the oxygen consumption stage is finished, the sewage is in an anoxic state, and the residual persulfate in the sewage is activated under the catalytic action of the fixed bed of the Fe and B modified carbon-based material in the anoxic stage to obtain S2O8 -And finally, the water from the sewage treatment area is purified to obtain purified effluent, and the quality of the purified effluent can stably reach the standard of surface standard IV water.
In another embodiment of the present application, the sewage treatment area is two separated sewage treatment areas, and the effluent enters the anoxic stage for further reaction after the sewage is treated in the oxygen consumption stage, so as to obtain purified effluent.
In specific implementation, fig. 2 shows a schematic diagram of an advanced wastewater treatment system according to an embodiment of the present invention, as shown in fig. 2:
this advanced wastewater treatment system includes: the device comprises an oxygen consumption reaction area and an anoxic reaction area, wherein the oxygen consumption reaction area and the anoxic reaction area are the same sewage treatment area which is built up and down, and the anoxic reaction area is a Fe and B modified carbon-based material filled in a fixed bed mode.
After the sewage to be treated enters the oxygen consumption reaction zone, sulfite and persulfate are added into the sewage to be treated, aerobic oxidation reaction is carried out in the upper oxygen consumption reaction zone, and reduction reaction does not occur in the anoxic reaction zone due to higher oxygen content in the sewage to be treated.
In practical application, sulfite and persulfate can be added into the oxygen consumption reaction zone at the same time when the sewage to be treated enters the oxygen consumption reaction zone so as to carry out aerobic oxidation reaction.
After the reaction in the oxygen consumption reaction zone is finished, the sewage to be treated is in an anoxic state, and the persulfate remained after the oxygen consumption oxidation reaction is further subjected to anaerobic reduction reaction under the catalytic action of the Fe and B modified carbon-based material filled in the anoxic stage. Finally, the quality of the effluent treated by the sewage advanced treatment system stably reaches the standard of surface standard IV water.
In order to make the technical personnel in the field understand the invention better, the advanced treatment process of the sewage provided by the invention is illustrated by a plurality of specific examples. In the embodiment of the invention, the COD and TN detection is performed by a national standard method, the levofloxacin is determined by a liquid chromatography, and the specific detection method refers to a general detection method in the prior art, which is not described herein again.
Example 1
Step 1: the initial concentration of sewage is COD: 50mg/L, levofloxacin: 5mg/L, TN: 10mg/L, adding 5mmol/L persulfate and 2mmol/L sulfite into the sewage, intermittently blowing for aeration, and after the reaction is carried out for 120min, respectively reaching 68 percent and 85 percent of removal rate of COD and levofloxacin;
step 2: and (3) adding the Fe and B modified carbon-based material into the effluent obtained after the reaction in the step (1), and reducing TN in the sewage to 5mg/L after the reaction is carried out for 90 min.
Example 2
Step 1: the initial concentration of sewage is COD: 50mg/L, levofloxacin: 5mg/L, TN: 10mg/L, adding 10mmol/L persulfate and 0.1mmol/L sulfite into the sewage, intermittently blowing for aeration, and after reacting for 120min, respectively reaching removal rates of COD and levofloxacin of 65% and 83%;
step 2: and (3) adding the Fe and B modified carbon-based material into the effluent obtained after the reaction in the step (1), and reducing TN in the sewage to 4mg/L after the reaction is carried out for 90 min.
Example 3
Step 1: the initial concentration of sewage is COD: 50mg/L, levofloxacin: 5mg/L, TN: 10mg/L, adding 10mmol/L persulfate and 1mol/L sulfite into the sewage, intermittently blowing for aeration, and after reacting for 120min, respectively reaching removal rates of COD and levofloxacin of 70% and 88%;
step 2: and (3) adding the Fe and B modified carbon-based material into the effluent obtained after the reaction in the step (1), and reducing TN in the sewage to 4mg/L after the reaction is carried out for 90 min.
Example 4
Step 1: the initial concentration of sewage is COD: 50mg/L, levofloxacin: 5mg/L, TN: 10mg/L, adding 10mmol/L persulfate and 10mmol/L sulfite into the sewage, intermittently blowing for aeration, and after reacting for 120min, respectively reaching removal rates of COD and levofloxacin of 71% and 87%;
step 2: and (3) adding the Fe and B modified carbon-based material into the effluent obtained after the reaction in the step (1), and reducing TN in the sewage to 4mg/L after the reaction is carried out for 90 min.
Example 5
Step 1: the initial concentration of sewage is COD: 50mg/L, levofloxacin: 5mg/L, TN: 10mg/L, adding 5mmol/L persulfate and 2mmol/L sulfite into the sewage while the sewage enters the upper oxygen consumption stage of the sewage treatment area, intermittently blowing for aeration, and after the reaction is carried out for 120min, the removal rates of COD and levofloxacin respectively reach 72% and 89%;
step 2: and (3) continuously reacting the sewage under the catalytic action of the fixed bed of the Fe and B modified carbon-based materials, wherein TN in the sewage is reduced to 4mg/L in the reaction time of 90 min.
The advanced wastewater treatment process and system provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. The advanced treatment process of the sewage is characterized by comprising the following steps:
step 1: firstly, raw sewage enters an oxygen consumption stage, persulfate and sulfite are respectively added through a dosing device, reducing substances and refractory organic pollutants in the raw sewage are removed, and primarily purified sewage is obtained and enters an anoxic stage;
step 2: after the primarily purified sewage enters an anoxic stage, in an anoxic environment, carrying out reduction reaction on the residual persulfate in the primarily purified sewage and the dissolved nitrate in the primarily purified sewage under the catalytic action of the Fe and B modified carbon-based material to remove the dissolved nitrate in the sewage and obtain purified effluent, wherein the quality of the effluent stably reaches the standard of surface quasi-IV water;
wherein the factors for determining the input amount of the persulfate include: the amount of the raw sewage, the amount of reducing substances in the raw sewage, the amount of refractory organic pollutants in the raw sewage and the amount of dissolved nitrates in the raw sewage.
2. The process of claim 1, wherein in step 1, the sulfite activates the persulfate to provide SO4 -By said.SO4 -And (3) oxidizing the reducing substances and the organic pollutants which are difficult to degrade, and removing the reducing substances and the organic pollutants which are difficult to degrade in the original sewage.
3. The process according to claim 1, wherein the ratio of the sulfite to the persulfate is: 1:100-100:1.
4. The process according to claim 1, wherein the dissolved oxygen in the preliminary purified wastewater is less than 1.0 mg/L;
the content of the persulfate in the primarily purified sewage is 30-65% of the initial addition amount of the persulfate.
5. The process according to claim 1, wherein in the step 2, the persulfate remaining in the primarily purified wastewater is subjected to a reduction reaction with the dissolved nitrate in the primarily purified wastewater under the catalytic action of the Fe and B modified carbon-based material, and the reduction reaction comprises the following steps:
the residual persulfate is activated into S under the catalytic action of the Fe and B modified carbon-based material2O8 -(ii) a Said S2O8 -And the nitrate in the sewage and the dissolved nitrate in the sewage are subjected to reduction reaction.
6. An advanced wastewater treatment system for performing the process of any one of claims 1 to 5, the system comprising: an oxygen depletion phase, an anoxic phase.
7. The system of claim 6, wherein the oxygen depletion stage and the anoxic stage are one and the same sewage treatment zone integrated from top to bottom, or wherein the oxygen depletion stage and the anoxic stage are two separate sewage treatment zones.
8. The system of claim 7, wherein when the oxygen consumption stage and the anoxic stage are the same sewage treatment zone integrated above and below, the sewage treatment zone comprises an upper oxygen consumption reaction zone and a lower anoxic reaction zone, and the lower anoxic reaction zone is filled with the Fe, B modified carbon-based material in a fixed bed manner.
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