A sewage treatment method and system for energy saving, carbon reduction, nitrogen removal and phosphorus removal in the whole process

Abstract

The invention discloses a sewage treatment method and system for energy saving, carbon reduction, nitrogen removal and phosphorus removal in the whole process, which belongs to the technical field of sewage treatment; including: pretreatment, anaerobic treatment, aerobic treatment, primary deep treatment, secondary deep treatment and activated carbon adsorption are sequentially performed on high COD and high ammonia nitrogen organic sewage, and the effluent meets the discharge standards; wherein, the biogas generated during the anaerobic treatment is subjected to two-stage desulfurization to obtain sulfur, sulfide and clean biogas; sulfur is used as the sulfur source for the primary deep treatment, and the sulfide generated by the biogas desulfurization is used as the sulfur source and phosphorus removal agent for the secondary deep treatment; at least part of the clean biogas obtained by the biogas desulfurization is used as the fuel gas for the regeneration of activated carbon. The present invention uses the sulfur and sulfide generated by the anaerobic biogas desulfurization as the sulfur source, enters the deep treatment to further remove TN and TP, and has extremely high economic value; the clean biogas after the anaerobic biogas desulfurization is used as the fuel gas for the regeneration of activated carbon, which reduces the operating cost.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment method and system for energy-saving, carbon reduction, nitrogen removal and phosphorus removal throughout the entire process, so as to achieve energy-saving, carbon reduction, COD removal, nitrogen removal and phosphorus removal of high-COD and high-ammonia nitrogen (NH3-N) organic sewage. Background Art

[0002] At present, while removing COD, NH3-N and TP in the sewage treatment process, it is necessary to simultaneously achieve energy conservation, carbon reduction, energy recovery, etc.

[0003] Conventional sewage treatment systems are mainly anaerobic aerobic treatment systems and advanced catalytic oxidation treatment systems. When using anaerobic aerobic treatment systems for sewage treatment, there are often problems such as high energy consumption and high effluent quality. The emission standards for effluent COD, NH3-N, TN, TP and other pollutants are becoming increasingly stringent. When using advanced catalytic oxidation treatment systems for sewage treatment, there are problems such as high treatment costs and large amounts of sludge. In addition, activated carbon adsorption and regeneration processes are also commonly used in the sewage treatment process. Conventional activated carbon regeneration uses natural gas as the regeneration heat source, which has problems such as high treatment costs and high energy consumption. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a sewage treatment method and system with full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal.

[0005] The present invention discloses a sewage treatment method for energy saving, carbon reduction, nitrogen removal and phosphorus removal in the whole process, comprising:

[0006] Pre-treat high COD and high ammonia nitrogen organic wastewater;

[0007] The pretreated sewage is subjected to anaerobic treatment to convert the COD in the sewage into biogas; the biogas is subjected to two-stage desulfurization to obtain sulfur, sulfide and clean biogas; wherein the first-stage desulfurization in the two-stage desulfurization is biogas biological desulfurization and / or wet desulfurization, and the second-stage desulfurization is dry desulfurization;

[0008] Aerobic treatment of anaerobic treated sewage;

[0009] The sewage after aerobic treatment is subjected to primary deep treatment; wherein, the primary deep treatment uses sulfur autotrophic denitrification for nitrogen removal, and the sulfur element produced by biogas desulfurization is used as the sulfur source for the primary deep treatment;

[0010] The sewage after primary deep treatment is subjected to secondary deep treatment; wherein, the secondary deep treatment uses sulfur autotrophic denitrification for nitrogen removal, and the sulfide (iron sulfide or calcium sulfide) produced by biogas desulfurization is used as the sulfur source and phosphorus removal agent for the secondary deep treatment;

[0011] The sewage after secondary deep treatment is subjected to activated carbon adsorption, and the produced water meets the discharge standards; the saturated activated carbon after adsorption is regenerated, and the regenerated activated carbon is reused for activated carbon adsorption; wherein, at least part of the clean biogas obtained by biogas desulfurization is used as fuel gas for activated carbon regeneration.

[0012] As a further improvement of the present invention, the pretreatment includes coagulation, sedimentation, pH adjustment and filtration to remove particles, impurities and suspended matter in the organic sewage.

[0013] As a further improvement of the present invention, the anaerobic treatment comprises:

[0014] Under anaerobic conditions, hydrolytic acidifying bacteria and hydrogen-producing and acetogenic bacteria convert COD in the influent into biogas, and convert organic nitrogen in the influent into NH3-N through anaerobism.

[0015] As a further improvement of the present invention, the aerobic treatment comprises:

[0016] Under aeration conditions, the COD in the influent is converted into CO2 and H2O for metabolism through heterotrophic and autotrophic biological treatment, and NH3-N is converted into N2 or NO3-N, so as to remove most of the COD and NH3-N in the sewage. The sewage after aerobic treatment contains a small amount of remaining COD, NH3-N, NO3-N, PO4-P and other pollutants.

[0017] As a further improvement of the present invention, the first-level deep processing includes:

[0018] The sulfur produced by biogas desulfurization is used as the sulfur source, and the sulfur autotrophic denitrification process is adopted to reduce nitrate nitrogen and convert NO3-N into nitrogen.

[0019] As a further improvement of the present invention, the secondary deep processing includes:

[0020] Using the iron sulfide or calcium sulfide produced by biogas desulfurization as the sulfur source, the sulfur autotrophic denitrification process is used for denitrification, and the nitrate nitrogen and nitrite nitrogen in the primary deep treatment effluent are further removed to achieve the standard discharge of TN;

[0021] The iron sulfide or calcium sulfide produced by biogas desulfurization is used as a phosphorus removal agent. During the sulfur autotrophic denitrification process, part of the iron ions or calcium ions react with the phosphate in the effluent to achieve the removal of total phosphorus and meet the standards.

[0022] As a further improvement of the present invention, dry desulfurization can use calcium desulfurization or iron oxide desulfurization to produce iron sulfide or calcium sulfide, which can also serve as a sulfur source and phosphorus removal agent for sulfur autotrophic denitrification to form calcium phosphate solids or iron phosphate for recycling and reuse. Iron oxide desulfurization is preferred.

[0023] As a further improvement of the present invention, in the secondary deep processing process:

[0024] When the sulfide produced by biogas desulfurization is iron-based sulfide (iron sulfide Fe2S3), sulfate-reducing bacteria use iron sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve TN removal; the iron ions produced by the reduction of iron sulfide act as a phosphorus removal agent and react with phosphate (PO4-P) to form iron phosphate FePO4 to achieve total phosphorus removal in wastewater, and the iron phosphate is recovered as a raw material for steelmaking and phosphorus recovery;

[0025] When the sulfide produced by biogas desulfurization is calcium sulfide (calcium sulfide CaS), sulfate-reducing bacteria use calcium sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve the removal of TN; the calcium ions produced after the reduction of calcium sulfide act as a phosphorus removal agent and react with phosphate (PO4-P) to form calcium phosphate compounds to achieve the removal of total phosphorus in wastewater. The calcium phosphate compounds are recovered as raw materials for steelmaking and phosphorus recovery.

[0026] As a further improvement of the present invention, the remaining purified biogas produced by anaerobism can be used for biogas power generation to supplement the energy self-sufficiency in sewage treatment.

[0027] As a further improvement of the present invention, it also includes:

[0028] The sludge generated during the pretreatment, anaerobic treatment, aerobic treatment, primary deep treatment and secondary deep treatment is treated and then transported out for disposal.

[0029] The present invention also discloses a full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment system, which is used to implement the above-mentioned sewage treatment method, comprising: a pretreatment unit, an anaerobic treatment unit, an aerobic treatment unit, a primary deep treatment unit, a secondary deep treatment unit and an activated carbon adsorption unit arranged in sequence along the treatment direction of high-COD and high-ammonia nitrogen organic sewage, and the effluent of the activated carbon adsorption unit meets the discharge standards;

[0030] The biogas generated by the anaerobic treatment unit enters the first desulfurization unit and the second desulfurization unit in sequence, and at least part of the clean biogas purified by the second desulfurization unit is used as fuel gas for the activated carbon regeneration unit; wherein the desulfurization process adopted by the first desulfurization unit is biogas biological desulfurization and / or wet desulfurization, and the desulfurization process adopted by the second desulfurization unit is dry desulfurization, the sulfur element generated by the first desulfurization unit is used as the sulfur source of the first-level deep processing unit, and the sulfide generated by the second desulfurization unit is used as the sulfur source of the second-level deep processing unit;

[0031] The saturated activated carbon in the activated carbon adsorption unit enters the activated carbon regeneration unit for regeneration, and the regenerated activated carbon returns to the activated carbon adsorption unit.

[0032] As a further improvement of the present invention, it also includes: a sludge treatment unit;

[0033] The sludge treatment unit is connected to at least one of the pretreatment unit, the anaerobic treatment unit, the aerobic treatment unit, the primary deep treatment unit, and the secondary deep treatment unit, and is used to treat the generated sludge and then transport it for disposal.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] Based on the anaerobic + aerobic treatment process, the present invention uses sulfur and sulfide produced by anaerobic biogas desulfurization as sulfur sources for deep treatment of effluent from aerobic treatment systems, and uses sulfur and sulfide for sulfur autotrophic denitrification, thereby reducing the consumption of carbon sources and achieving energy conservation and carbon reduction. Sulfides (calcium sulfide and iron sulfide) produced by dry desulfurization react with phosphates in deep treatment of aerobic effluent in water to form iron-based phosphates and calcium-based phosphates, thereby simultaneously achieving the removal of TN and TP, and achieving high-standard discharge, which has extremely high process value, economic value, etc.

[0036] The present invention uses the clean biogas after anaerobic biogas desulfurization as the fuel gas for activated carbon regeneration, and combines anaerobic biogas with activated carbon adsorption process and regeneration process, which can improve the effluent water quality and reduce the operation cost in one step. It has many advantages such as low energy consumption, no need to add carbon source, high denitrification efficiency, self-sufficiency in energy recovery, etc. It is used for the deep denitrification treatment of high-concentration organic sewage and other municipal sewage, has extremely broad economic value and environmental protection significance, and has very broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flow chart of the sewage treatment method for energy saving, carbon reduction, nitrogen removal and phosphorus removal in the whole process disclosed by the present invention;

[0038] Figure 2 This is a framework diagram of the full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment system disclosed in the present invention.

[0039] In the figure:

[0040] 1. Pretreatment unit; 2. Anaerobic treatment unit; 3. Aerobic treatment unit; 4. Primary deep treatment unit; 5. Secondary deep treatment unit; 6. Activated carbon adsorption unit; 7. Activated carbon regeneration unit; 8. First desulfurization unit; 9. Second desulfurization unit; 10. Sludge treatment unit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0043] like Figure 1 As shown, the present invention provides a full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method, comprising:

[0044] Step 1: pre-treat the high COD and high ammonia nitrogen organic wastewater to remove particles, impurities and suspended matter in the organic wastewater; wherein the pre-treatment includes coagulation, sedimentation, pH adjustment and filtration.

[0045] Step 2: The pretreated sewage is anaerobically treated. Under anaerobic conditions, hydrolytic acidifying bacteria and hydrogen-producing and acetogenic bacteria convert the COD in the influent into biogas, and convert the organic nitrogen in the influent into NH3-N through anaerobism.

[0046] Step 3, the biogas produced by the anaerobic treatment is subjected to two-stage desulfurization to obtain sulfur, sulfide and clean biogas; wherein, the first-stage desulfurization in the two-stage desulfurization is biogas biological desulfurization and / or wet desulfurization, and the sulfur produced by the first-stage desulfurization is used as the sulfur source for the first-stage deep treatment (sulfur autotrophic denitrification); the second-stage desulfurization is dry desulfurization, and the dry desulfurization can use calcium desulfurization or iron oxide desulfurization to produce iron sulfide or calcium sulfide, which is used as the sulfur source and dephosphorization agent for the second-stage deep treatment (sulfur autotrophic denitrification), forming a calcium phosphate solid or iron phosphate, which is recycled and reused, preferably using iron oxide desulfurization.

[0047] Step 4, aerobic treatment of the sewage after anaerobic treatment, that is: under aeration conditions, the COD in the influent is converted into CO2 and H2O for metabolism through heterotrophic and autotrophic biological treatment, and NH3-N is converted into N2 or NO3-N, so as to achieve the removal of most of the COD and NH3-N in the sewage. The sewage after aerobic treatment contains a small amount of remaining COD, NH3-N, NO3-N, PO4-P and other pollutants. Among them, aerobic treatment can use conventional activated sludge method, nitrification and denitrification, nitrite and denitrification, anaerobic ammonium oxidation and other heterotrophic and autotrophic biological treatment processes, which can simultaneously achieve the removal of COD, nitrogen and phosphorus removal processes, preferably using nitrite and denitrification, anaerobic ammonium oxidation and other low-carbon energy-saving processes.

[0048] Step 5: Perform primary deep treatment on the aerobic treated sewage: use the sulfur produced by biogas desulfurization as the sulfur source, adopt the sulfur autotrophic denitrification process to reduce nitrate nitrogen, and convert NO3-N into nitrogen.

[0049] Step 6: Perform secondary deep treatment on the sewage after primary deep treatment:

[0050] When the sulfide produced by biogas desulfurization is iron-based sulfide (iron sulfide Fe2S3), sulfate-reducing bacteria use iron sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve TN removal; the iron ions produced by the reduction of iron sulfide act as a phosphorus removal agent and react with phosphate (PO4-P) to form iron phosphate FePO4 to achieve total phosphorus removal in wastewater, and the iron phosphate is recovered as a raw material for steelmaking and phosphorus recovery;

[0051] When the sulfide produced by biogas desulfurization is calcium sulfide (calcium sulfide CaS), sulfate-reducing bacteria use calcium sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve the removal of TN; the calcium ions produced after the reduction of calcium sulfide act as a phosphorus removal agent and react with phosphate (PO4-P) to form calcium phosphate compounds to achieve the removal of total phosphorus in wastewater. The calcium phosphate compounds are recovered as raw materials for steelmaking and phosphorus recovery.

[0052] Step 7: The effluent from the secondary deep treatment still contains a small amount of difficult-to-degrade organic matter. In order to meet the emission standards, the sewage after the secondary deep treatment is subjected to activated carbon adsorption, and the difficult-to-degrade organic matter is removed by activated carbon adsorption, and the produced water meets the emission standards; the saturated activated carbon after adsorption is subjected to high-temperature regeneration of the activated carbon to restore the adsorption performance of the activated carbon, and the organic matter adsorbed by the saturated activated carbon is oxidized by the high-temperature flue gas into CO2 and H2O that enter the waste gas treatment system to achieve purification, and the waste carbon is discharged, and the regenerated activated carbon is reused for activated carbon adsorption; wherein, at least part of the clean biogas obtained by biogas desulfurization is used as fuel gas for activated carbon regeneration, and the remaining purified biogas can be used for biogas power generation to supplement the energy self-sufficiency in sewage treatment.

[0053] Step 8: After treating the sludge generated during the pretreatment, anaerobic treatment, aerobic treatment, primary deep treatment, and secondary deep treatment, it is transported out for disposal.

[0054] like Figure 2As shown, the present invention provides a full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment system for realizing the above-mentioned sewage treatment method, comprising: a pretreatment unit 1, an anaerobic treatment unit 2, an aerobic treatment unit 3, a primary deep treatment unit 4, a secondary deep treatment unit 5 and an activated carbon adsorption unit 6 arranged in sequence along the treatment direction of high COD and high ammonia nitrogen organic sewage, and the effluent of the activated carbon adsorption unit 6 meets the discharge standards; the biogas generated by the anaerobic treatment unit 2 enters the first desulfurization unit 8 and the second desulfurization unit 9 in sequence, and at least part of the clean biogas purified by the second desulfurization unit 9 is used as fuel gas for the activated carbon regeneration unit 7; wherein the desulfurization process adopted by the first desulfurization unit 8 is biogas biological desulfurization and / or wet desulfurization, and the desulfurization process adopted by the second desulfurization unit 9 is dry desulfurization, the sulfur element generated by the first desulfurization unit is used as the sulfur source of the primary deep treatment unit, and the sulfide generated by the second desulfurization unit is used as the sulfur source of the secondary deep treatment unit; the saturated activated carbon of the activated carbon adsorption unit 6 enters the activated carbon regeneration unit 7 for regeneration, and the regenerated activated carbon returns to the activated carbon adsorption unit 6. At least one of the pretreatment unit 1, the anaerobic treatment unit 2, the aerobic treatment unit 3, the primary deep treatment unit 4, and the secondary deep treatment unit 5 is connected to the sludge treatment unit 10 for treating the generated sludge and transporting it for disposal.

[0055] Pretreatment unit 1, removes impurities and other pollutants in high COD and high NH3-N sewage through coagulation sedimentation, pH adjustment, filtration and other processes;

[0056] The anaerobic treatment unit 2 converts the COD in the influent into biogas through anaerobic means. The biogas enters the biogas biological desulfurization, wet desulfurization and dry desulfurization for purification and is then used for activated carbon regeneration and biogas power generation.

[0057] Aerobic treatment unit 3 removes pollutants such as COD, NH3-N, TN, and TP through a combination of autotrophic or heterotrophic biological treatment processes such as anaerobic, anoxic, and aerobic.

[0058] The primary deep treatment unit 4 further removes TN in the effluent by using sulfur produced by biogas biological desulfurization and wet desulfurization as the sulfur source for sulfur autotrophic denitrification treatment.

[0059] The secondary deep treatment unit 5 uses the iron and calcium sulfides produced by the dry desulfurization of biogas as a sulfur source to further reduce and remove TN, and also acts as a phosphorus removal agent to react with phosphates in the effluent to remove TP, thereby achieving TP compliance and phosphorus resource recovery.

[0060] Activated carbon adsorption unit 6, the effluent can achieve extremely high effluent water quality, the effluent COD can be stably <30mg / L, NH3-N <6mg / L, TN <10mg / L, TP <0.2mg / L.

[0061] The saturated activated carbon produced by the activated carbon adsorption unit 6 enters the activated carbon regeneration unit 7, and is regenerated by using the purified biogas after desulfurization to restore the adsorption capacity of the activated carbon.

[0062] The residual sludge generated by the pretreatment unit 1, the anaerobic treatment unit 2, the aerobic treatment unit 3, the primary deep treatment unit 4, and the secondary deep treatment unit 5 enters the sludge treatment unit 10 for treatment and then is transported out for disposal.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method, characterized in that: include: Pre-treat high COD and high ammonia nitrogen organic wastewater; Anaerobic treatment is performed on the pre-treated sewage to convert the COD in the sewage into biogas; The biogas is subjected to two-stage desulfurization to obtain elemental sulfur, sulfide and clean biogas; wherein the first-stage desulfurization in the two-stage desulfurization is biogas biological desulfurization and / or wet desulfurization, and the second-stage desulfurization is dry desulfurization; Aerobic treatment of anaerobic treated sewage; The sewage after aerobic treatment is subjected to primary deep treatment; wherein, the primary deep treatment uses sulfur autotrophic denitrification for nitrogen removal, and the sulfur element produced by biogas desulfurization is used as the sulfur source for the primary deep treatment; The sewage after primary deep treatment is subjected to secondary deep treatment; wherein, the secondary deep treatment uses sulfur autotrophic denitrification for nitrogen removal, and the sulfide produced by biogas desulfurization is used as the sulfur source and phosphorus removal agent for the secondary deep treatment; The sewage after secondary deep treatment is subjected to activated carbon adsorption, and the produced water meets the discharge standards; the saturated activated carbon after adsorption is regenerated, and the regenerated activated carbon is reused for activated carbon adsorption; wherein, at least part of the clean biogas obtained by biogas desulfurization is used as fuel gas for activated carbon regeneration.

2. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: The pretreatment includes coagulation, sedimentation, pH adjustment and filtration to remove particles, impurities and suspended matter in the organic sewage.

3. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: The anaerobic treatment comprises: Under anaerobic conditions, hydrolytic acidifying bacteria and hydrogen-producing and acetogenic bacteria convert COD in the influent into biogas, and convert organic nitrogen in the influent into NH3-N through anaerobism.

4. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: The aerobic treatment comprises: Under aeration conditions, the COD in the influent is converted into CO2 and H2O for metabolism through heterotrophic and autotrophic biological treatment, and NH3-N is converted into N2 or NO3-N, so as to achieve the removal of most of the COD and NH3-N in the sewage.

5. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: The first-level deep processing includes: The sulfur produced by biogas desulfurization is used as the sulfur source, and the sulfur autotrophic denitrification process is adopted to reduce nitrate nitrogen and convert NO3-N into nitrogen.

6. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: The secondary deep processing includes: Using the iron sulfide or calcium sulfide produced by biogas desulfurization as the sulfur source, the sulfur autotrophic denitrification process is used for denitrification, and the nitrate nitrogen and nitrite nitrogen in the primary deep treatment effluent are further removed to achieve the standard discharge of TN; The iron sulfide or calcium sulfide produced by biogas desulfurization is used as a phosphorus removal agent. During the sulfur autotrophic denitrification process, part of the iron ions or calcium ions react with the phosphate in the effluent to achieve the removal of total phosphorus and meet the standards.

7. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 6 is characterized in that: During the secondary deep processing: When the sulfide produced by biogas desulfurization is iron sulfide, sulfate-reducing bacteria use iron sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve TN removal; the iron ions produced by the reduction of iron sulfide act as a phosphorus removal agent to react with phosphate to form iron phosphate to achieve the removal of total phosphorus in wastewater, and the iron phosphate is recovered as a raw material for steelmaking and phosphorus recovery; When the sulfide produced by biogas desulfurization is calcium sulfide, sulfate-reducing bacteria use calcium sulfide to reduce nitrite nitrogen and nitrate nitrogen to achieve the removal of TN; the calcium ions produced after the reduction of calcium sulfide act as a phosphorus removal agent and react with phosphate to form calcium phosphate compounds to achieve the removal of total phosphorus in the wastewater. The calcium phosphate compounds are recovered as raw materials for steelmaking and phosphorus recovery.

8. The whole-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method according to claim 1 is characterized in that: Also includes: The sludge generated during the pretreatment, anaerobic treatment, aerobic treatment, primary deep treatment and secondary deep treatment is treated and then transported out for disposal.

9. A full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment system, used to implement the full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment method as described in any one of claims 1 to 8, characterized in that: include: A pretreatment unit, an anaerobic treatment unit, an aerobic treatment unit, a primary deep treatment unit, a secondary deep treatment unit and an activated carbon adsorption unit are sequentially arranged along the treatment direction of high-COD and high-ammonia nitrogen organic sewage, and the effluent of the activated carbon adsorption unit meets the discharge standards; The biogas generated by the anaerobic treatment unit enters the first desulfurization unit and the second desulfurization unit in sequence, and at least part of the clean biogas purified by the second desulfurization unit is used as fuel gas for the activated carbon regeneration unit; wherein the desulfurization process adopted by the first desulfurization unit is biogas biological desulfurization and / or wet desulfurization, and the desulfurization process adopted by the second desulfurization unit is dry desulfurization, the sulfur element generated by the first desulfurization unit is used as the sulfur source of the first-level deep processing unit, and the sulfide generated by the second desulfurization unit is used as the sulfur source of the second-level deep processing unit; The saturated activated carbon in the activated carbon adsorption unit enters the activated carbon regeneration unit for regeneration, and the regenerated activated carbon returns to the activated carbon adsorption unit.

10. The full-process energy-saving, carbon reduction, nitrogen removal and phosphorus removal sewage treatment system according to claim 9 is characterized in that: Also includes: Sludge treatment unit; The sludge treatment unit is connected to at least one of the pretreatment unit, the anaerobic treatment unit, the aerobic treatment unit, the primary deep treatment unit, and the secondary deep treatment unit, and is used to treat the generated sludge and then transport it for disposal.

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