Advanced oxidation and sulfur circulation coupled wastewater treatment system and method with wastewater advanced treatment function

Abstract

The invention relates to an advanced oxidation and sulfur circulation coupled wastewater treatment system and method with wastewater advanced treatment, the advanced oxidation system comprises a first feeding pump, a first UASB reactor and a first feeding device, the first feeding pump is used for conveying to-be-treated wastewater to the first UASB reactor, and the first feeding device is used for conveying the to-be-treated wastewater to the second UASB reactor; the first feeding device is used for adding an advanced oxidation reactant into the first UASB reactor so as to carry out advanced oxidation reaction in the first UASB reactor; the sulfur circulation biological denitrification system comprises a second feeding pump, a second UASB reactor, a dissolving water tank and a second feeding device, the second feeding device is used for adding reaction materials into the dissolving water tank, and the second feeding pump is used for conveying treated wastewater from the dissolving water tank to the second UASB reactor; the treated wastewater and the reaction bacteria in the second UASB reactor are subjected to a sulfur cycle biological denitrification reaction; the efficient and economical treatment on the wastewater containing pollutants such as complex-state metals and nitrogen oxides is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to an advanced oxidation and sulfur cycle coupled wastewater treatment system and method with advanced wastewater treatment. Background Art

[0002] With the rapid development of industry and the acceleration of urbanization, water pollution is becoming increasingly serious. Many industrial and domestic wastewaters contain large amounts of pollutants such as complex metals, organic matter, and nitrogen oxides. Traditional water treatment methods often have limitations when treating such complex wastewaters.

[0003] Although advanced oxidation technology can effectively remove complex metals and degrade organic matter in wastewater, it has limited effect on removing nitrogen oxides in wastewater and the treatment cost is relatively high.

[0004] Sulfur autotrophic denitrification technology has limitations in terms of solid sulfur source mass transfer efficiency, and can lead to problems such as easy sulfur ion loss, subsequent sulfate pollution, and sulfide biotoxicity. However, sulfur recycling biological system denitrification technology has certain advantages in treating nitrogen-containing wastewater. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the current water treatment system, the present invention provides a wastewater treatment system and method that couples advanced oxidation and sulfur circulation with deep wastewater treatment, which can give full play to the advantages of both, realize efficient and economical treatment of wastewater containing pollutants such as complex metals and nitrogen oxides, and improve the water purification effect.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided an advanced oxidation and sulfur cycle coupled wastewater treatment system with advanced wastewater treatment, the water treatment system comprising:

[0008] An advanced oxidation system is provided for implementing an advanced oxidation reaction based on a first UASB reactor, the advanced oxidation system comprising: a first feed pump, a first UASB reactor, and a first feeding device, wherein the first feed pump is used to transport the wastewater to be treated to the first UASB reactor, and the first feeding device is used to add an advanced oxidation reactant into the first UASB reactor to cause the advanced oxidation reaction to occur in the first UASB reactor;

[0009] A sulfur cycle biological denitrification system is provided, which realizes the sulfur cycle biological denitrification reaction based on a second UASB reactor. The sulfur cycle biological denitrification system comprises: a second feed pump, a second UASB reactor, a dissolving water tank, and a second feeding device. The second feeding device is used to add reaction materials into the dissolving water tank. The second feed pump is used to transport the wastewater under treatment from the dissolving water tank to the second UASB reactor, so that the wastewater under treatment and the reaction bacteria in the second UASB reactor undergo the sulfur cycle biological denitrification reaction.

[0010] A delivery pump, used for delivering the treated wastewater after the advanced oxidation reaction to the dissolving water tank;

[0011] Wastewater advanced treatment subsystem, including:

[0012] Chemical precipitation unit: receives the effluent from the sulfur cycle biological denitrification system and adds calcium salt to generate calcium sulfate precipitation;

[0013] Activated carbon adsorption unit: filled with activated carbon to adsorb residual organic matter and heavy metals;

[0014] Ultraviolet disinfection unit: equipped with ultraviolet lamp group to sterilize the outlet water.

[0015] Optionally, the advanced oxidation system further includes: a first circulation pump, configured to transport the wastewater under treatment flowing out of the first UASB reactor back to the first UASB reactor for an advanced oxidation reaction.

[0016] Optionally, the sulfur cycle biological denitrification system further includes: a sludge circulation pump, a water bath and a second circulation pump; the sludge circulation pump is used to transport the sludge flowing out of the second UASB reactor to the second UASB reactor again; the water bath is used to insulate the second UASB reactor; and the second circulation pump is used to circulate the hot water heated by the water bath in the second UASB reactor.

[0017] Optionally, both the first UASB reactor and the second UASB reactor are provided with a gas outlet and a sampling port.

[0018] Optionally, the gas outlet of the first UASB reactor and the gas outlet of the second UASB reactor are both connected to a wet gas flow meter via a rubber hose.

[0019] Optionally, the advanced oxidation reactant is CaFeCo and sodium hypochlorite, the CaFeCo is a layered block structure, and the molar ratio of calcium, iron and cobalt is 4:1:2.

[0020] Optionally, the reaction bacteria are anaerobic bacteria mixed with sulfate-reducing bacteria and denitrifying Thiobacillus, and the reaction materials are sodium sulfate, potassium nitrate and glucose.

[0021] Optionally, both the first UASB reactor and the second UASB reactor are provided with a double-layer insulation structure made of acrylic material.

[0022] Optionally, a stirrer is provided in the dissolving water tank to fully dissolve the reaction materials.

[0023] According to a second aspect of the present invention, a wastewater treatment method coupled with advanced oxidation and sulfur cycle with advanced wastewater treatment is provided, wherein the above-mentioned water treatment system is used for water treatment, and the method steps are as follows:

[0024] S1, adding an advanced oxidation reactant into the first UASB reactor;

[0025] S2, the first feed pump transports the wastewater to be treated to the first UASB reactor, and the advanced oxidation reaction is carried out in the first UASB reactor;

[0026] S3, the delivery pump delivers the treated wastewater after the advanced oxidation reaction to the dissolving water tank;

[0027] S4, adding reaction materials into the dissolving water tank;

[0028] S5, the second feed pump transports the wastewater under treatment to the second UASB reactor, and the sulfur cycle biological denitrification reaction is carried out in the second UASB reactor;

[0029] S6, the effluent from the sulfur cycle enters the chemical precipitation unit, where calcium salt is added to generate calcium sulfate precipitation;

[0030] S7, the supernatant of the sedimentation enters the activated carbon adsorption unit to adsorb residual organic matter and heavy metals;

[0031] S8, after adsorption, the water flows through the ultraviolet disinfection unit for sterilization;

[0032] S9. The effluent is discharged after it meets the monitoring standards.

[0033] The advantages of the present invention are: 1. In the advanced oxidation system, the CaFeCo composite material is used as a catalyst to cooperate with sodium hypochlorite to carry out advanced oxidation. The sodium hypochlorite in the water body is decomposed into active substances such as hydroxyl radicals, chlorine radicals, singlet oxygen, and superoxide radicals. The highly active hydroxyl radicals react with organic matter to degrade the organic matter, especially for amino and carboxyl organic compounds rich in electron groups. The degradation reaction is rapid, and the complexed metals and organic matter in the wastewater can be effectively treated; 2. In the sulfur cycle biological denitrification system, sulfate-reducing bacteria use electrons provided by the organic carbon source to reduce sulfate to sulfides such as H2S and HS under anaerobic conditions. - 、S 2- Etc., these generated sulfides act as electron acceptors, and the nitrate nitrogen in the water sample provides electrons, and the nitrate nitrogen is converted into nitrogen gas under the action of sulfur autotrophic denitrifying bacteria, and the sulfide is finally converted into sulfate, which can effectively treat nitrogen oxides in wastewater; 3. The wastewater treatment process is simple and easy to manage and control; the startup cycle is short; 4. The operation difficulty is low, and the operating parameters can be flexibly adjusted according to factors such as the wastewater inlet flow rate and water quality, so that the system can adapt to the treatment needs of wastewater of different types and water quality, thereby improving the versatility and adaptability of the system; 5. It can quickly solve problems such as high organic matter concentration and excessive nitrate content in wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a structural block diagram of the wastewater treatment system of the present invention;

[0036] Figure 2 This is a structural diagram of the wastewater deep treatment subsystem described in the present invention.

[0037] Figure 3 is a perspective view of the advanced oxidation system of the present invention;

[0038] Figure 4 is a perspective view of the sulfur cycle biological denitrification system of the present invention;

[0039] Figure 5 It is a front view of the advanced oxidation system of the present invention;

[0040] Figure 6 This is a front view of the sulfur cycle biological denitrification system of the present invention;

[0041] Figure 7 is a cross-sectional view of the advanced oxidation system of the present invention;

[0042] Figure 8 is a cross-sectional view of the sulfur cycle biological denitrification system of the present invention;

[0043] Figure 9 A top view of the advanced oxidation system of the present invention;

[0044] Figure 10 A top view of the sulfur cycle biological denitrification system of the present invention;

[0045] Figure 11 The present invention is a flow chart of the wastewater treatment method.

[0046] In the figure: 100, advanced oxidation system; 101, first feed pump; 102, first UASB reactor; 1021, first gas outlet; 1022, first water inlet; 1023, second water inlet; 1024, first water outlet; 1025, second water outlet; 103, first circulation pump; 104, first electric control box; 200, sulfur circulation biological denitrification system; 201, second feed pump; 202, second UASB reactor device; 2021, second air outlet; 2022, third water inlet; 2023, fourth water inlet; 2024, fifth water inlet; 2025, third water outlet; 2026, fourth water outlet; 2027, fifth water outlet; 203, dissolving water tank; 204, sludge circulation pump; 205, water bath; 206, second circulation pump; 207, second electric control box; 208, water outlet tank; 209, mixer; 300, delivery pump. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figures 1-10As shown, a wastewater treatment system with advanced oxidation and sulfur cycle coupling with advanced wastewater treatment, the water treatment system includes: an advanced oxidation system 100, a sulfur cycle biological denitrification system 200 and a delivery pump 300; the wastewater advanced treatment subsystem includes: a chemical precipitation unit: receiving the effluent of the sulfur cycle biological denitrification system, adding calcium salt to generate calcium sulfate precipitation; an activated carbon adsorption unit: filled with activated carbon for adsorbing residual organic matter and heavy metals; an ultraviolet disinfection unit: equipped with an ultraviolet lamp group for sterilizing the effluent; the advanced oxidation system 100 realizes the advanced oxidation reaction based on the first UASB reactor 102, the advanced oxidation system 100 includes: a first feed pump 101, a first UASB reactor 102 and a first feeding device, the first feed pump 101 is used to transport the wastewater to be treated to the first UASB reactor 102, the first feeding device is used to An advanced oxidation reaction agent is added to the reactor 102 to cause the advanced oxidation reaction to occur in the first UASB reactor 102; the sulfur cycle biological denitrification system 200 realizes the sulfur cycle biological denitrification reaction based on the second UASB reactor 202, and the sulfur cycle biological denitrification system 200 includes: a second feeding pump 201, a second UASB reactor 202, a dissolving water tank 203 and a second feeding device, the second feeding device is used to add reaction materials into the dissolving water tank 203, the second feeding pump 201 is used to transport the treated wastewater from the dissolving water tank 203 to the second UASB reactor 202, so that the treated wastewater and the reaction bacteria in the second UASB reactor 202 undergo the sulfur cycle biological denitrification reaction; the delivery pump 300 is used to transport the treated wastewater after the advanced oxidation reaction to the dissolving water tank 203.

[0050] Specifically, the advanced oxidation system 100 includes a water inlet tank, a first feed pump 101, a first UASB reactor 102, a first feeding device and a first electric control box 104. The first UASB reactor 102 is provided with a first water inlet 1022, a second water inlet 1023, a first water outlet 1024 and a second water outlet 1025. The sulfur cycle biological denitrification system 200 includes a second feed pump 201, a second UASB reactor 202, a dissolving water tank 203, a second feeding device, a water outlet tank 208 and a second electric control box 207. The second UASB reactor 202 is provided with a third water inlet 2022, a fourth water inlet 2023, a fifth water inlet 2024, a third water outlet 2025, a fourth water outlet 2026 and a fifth water outlet 2027. When the system is in operation, an advanced oxidation reaction agent is added thereto, the wastewater to be treated enters the first UASB reactor 102 from the water inlet tank through the first water inlet 1022 via the first feed pump 101, and an advanced oxidation reaction is carried out in the first UASB reactor 102. After the wastewater under treatment exits the water outlet of the first UASB reactor 102, it enters the dissolution water tank 203 via the delivery pump 300, and the reaction materials are added to the dissolution water tank 203. The wastewater under treatment enters the second UASB reactor 202 from the third water inlet 2022 via the second feed pump 201, and a sulfur cycle biological denitrification reaction is carried out in the second UASB reactor 202. The treated wastewater enters the water outlet tank 208 from the water outlet of the second UASB reactor 202. The first electric control box 104 and the second electric control box 207 are used to control and protect their electrical equipment.

[0051] Example 2

[0052] like Figures 1-10As shown, a wastewater treatment system with advanced oxidation and sulfur cycle coupling with advanced wastewater treatment, the water treatment system includes: an advanced oxidation system 100, a sulfur cycle biological denitrification system 200 and a delivery pump 300; the wastewater advanced treatment subsystem includes: a chemical precipitation unit: receiving the effluent of the sulfur cycle biological denitrification system, adding calcium salt to generate calcium sulfate precipitation; an activated carbon adsorption unit: filled with activated carbon for adsorbing residual organic matter and heavy metals; an ultraviolet disinfection unit: equipped with an ultraviolet lamp group for sterilizing the effluent; the advanced oxidation system 100 realizes the advanced oxidation reaction based on the first UASB reactor 102, the advanced oxidation system 100 includes: a first feed pump 101, a first UASB reactor 102 and a first feeding device, the first feed pump 101 is used to transport the wastewater to be treated to the first UASB reactor 102, the first feeding device is used to An advanced oxidation reaction agent is added to the reactor 102 to cause the advanced oxidation reaction to occur in the first UASB reactor 102; the sulfur cycle biological denitrification system 200 realizes the sulfur cycle biological denitrification reaction based on the second UASB reactor 202, and the sulfur cycle biological denitrification system 200 includes: a second feeding pump 201, a second UASB reactor 202, a dissolving water tank 203 and a second feeding device, the second feeding device is used to add reaction materials into the dissolving water tank 203, the second feeding pump 201 is used to transport the treated wastewater from the dissolving water tank 203 to the second UASB reactor 202, so that the treated wastewater and the reaction bacteria in the second UASB reactor 202 undergo the sulfur cycle biological denitrification reaction; the delivery pump 300 is used to transport the treated wastewater after the advanced oxidation reaction to the dissolving water tank 203.

[0053] Furthermore, as an option, the advanced oxidation system 100 also includes: a first circulation pump 103, which is used to transport the treated wastewater flowing out of the first UASB reactor 102 back to the first UASB reactor 102 for an advanced oxidation reaction; to increase the contact time and reaction degree between the wastewater and the advanced oxidation reactant, enhance the removal effect of complexed metals and organic matter, and improve the treatment efficiency.

[0054] Furthermore, the sulfur cycle biological denitrification system 200 also includes: a sludge circulation pump 204, a water bath 205 and a second circulation pump 206; the sludge circulation pump 204 is used to transport the sludge flowing out of the second UASB reactor 202 to the second UASB reactor 202 again; the water bath 205 is used to keep the second UASB reactor 202 warm; the second circulation pump 206 is used to circulate the hot water heated by the water bath 205 in the second UASB reactor 202; the design of the sludge circulation pump 204 can recycle the sludge, retain the reaction bacteria, and ensure that the reaction proceeds continuously and efficiently; the design of the water bath 205 can provide a stable temperature to provide a suitable environment for the reaction bacteria, thereby improving the efficiency of the sulfur cycle biological denitrification reaction.

[0055] Specifically, the advanced oxidation system 100 includes a water inlet tank, a first feed pump 101, a first circulation pump 103, a first UASB reactor 102, a first feeding device and a first electric control box 104. The first UASB reactor 102 is provided with a first water inlet 1022, a second water inlet 1023, a first water outlet 1024 and a second water outlet 1025. The sulfur cycle biological denitrification system 200 includes a second feed pump 201, a sludge circulation pump 204, a water bath 205, a second circulation pump 206, a second UASB reactor 202, a dissolving water tank 203, a second feeding device, an outlet The water tank 208 and the second electric control box 207 are provided with a third water inlet 2022, a fourth water inlet 2023, a fifth water inlet 2024, a third water outlet 2025, a fourth water outlet 2026 and a fifth water outlet 2027 on the second UASB reactor 202; when the first UASB reactor 102 is in operation, an advanced oxidation reactant is added thereto, and the wastewater to be treated enters the first UASB reactor 102 from the water inlet tank through the first water inlet 1022 via the first feed pump 101, and the advanced oxidation reaction is carried out in the first UASB reactor 102. After coming out of the first water outlet 1024 of the reactor 102, the wastewater enters the first UASB reactor 102 again through the second water inlet 1023 of the first UASB reactor 102 through the first circulation pump 103. The treated wastewater then flows out of the second water outlet 1025 of the first UASB reactor 102 and enters the dissolution water tank 203 through the delivery pump 300. The reaction materials are added to the dissolution water tank 203. The treated wastewater enters the second UASB reactor 202 through the third water inlet 2022 through the second feed pump 201. The sulfur cycle biological denitrification reaction is carried out in the second UASB reactor 202. The treated wastewater enters the water outlet tank 208 from the third water outlet 2025 of the second UASB reactor 202. After the sludge in the wastewater exits the fourth water outlet 2026, it re-enters the second UASB reactor 202 through the fourth water inlet 2023 via the sludge circulation pump 204. A water bath 205 is provided to keep the second UASB reactor 202 warm. The hot water exiting the fifth water outlet 2027 re-enters the second UASB reactor 202 through the fifth water inlet 2024 via the second circulation pump 206. The first electrical control box 104 and the second electrical control box 207 are used to control and protect their electrical equipment.

[0056] Example 3

[0057] like Figures 1-10As shown, a wastewater treatment system with advanced oxidation and sulfur cycle coupling with advanced wastewater treatment, the water treatment system includes: an advanced oxidation system 100, a sulfur cycle biological denitrification system 200 and a delivery pump 300; the wastewater advanced treatment subsystem includes: a chemical precipitation unit: receiving the effluent of the sulfur cycle biological denitrification system, adding calcium salt to generate calcium sulfate precipitation; an activated carbon adsorption unit: filled with activated carbon for adsorbing residual organic matter and heavy metals; an ultraviolet disinfection unit: equipped with an ultraviolet lamp group for sterilizing the effluent; the advanced oxidation system 100 realizes the advanced oxidation reaction based on the first UASB reactor 102, the advanced oxidation system 100 includes: a first feed pump 101, a first UASB reactor 102 and a first feeding device, the first feed pump 101 is used to transport the wastewater to be treated to the first UASB reactor 102, the first feeding device is used to An advanced oxidation reaction agent is added to the reactor 102 to cause the advanced oxidation reaction to occur in the first UASB reactor 102; the sulfur cycle biological denitrification system 200 realizes the sulfur cycle biological denitrification reaction based on the second UASB reactor 202, and the sulfur cycle biological denitrification system 200 includes: a second feeding pump 201, a second UASB reactor 202, a dissolving water tank 203 and a second feeding device, the second feeding device is used to add reaction materials into the dissolving water tank 203, the second feeding pump 201 is used to transport the treated wastewater from the dissolving water tank 203 to the second UASB reactor 202, so that the treated wastewater and the reaction bacteria in the second UASB reactor 202 undergo the sulfur cycle biological denitrification reaction; the delivery pump 300 is used to transport the treated wastewater after the advanced oxidation reaction to the dissolving water tank 203.

[0058] Furthermore, both the first UASB reactor 102 and the second UASB reactor 202 are provided with a gas outlet and a sampling port. The first UASB reactor is provided with a first gas outlet 1021, and the second UASB reactor is provided with a second gas outlet 2021. This facilitates real-time monitoring of gas generation and water quality changes during the reaction process, timely understanding of the treatment effect, and providing a basis for process adjustment.

[0059] Furthermore, the gas outlet of the first UASB reactor 102 and the gas outlet of the second UASB reactor 202 are both connected to a wet gas flow meter through a rubber hose; the gas flow data is accurately obtained, the reaction progress and efficiency are more accurately analyzed, and the reaction conditions are optimized.

[0060] Furthermore, the advanced oxidation reactant is CaFeCo and sodium hypochlorite, the CaFeCo has a layered block structure, and the molar ratio of calcium, iron and cobalt is 4:1:2; the CaFeCo composite catalyst improves the oxidation ability of sodium hypochlorite and can effectively treat complex metals and organic matter in wastewater, especially organic compounds rich in electron groups.

[0061] Furthermore, the reaction bacteria are anaerobic bacteria mixed with sulfate-reducing bacteria and denitrifying thiobacillus, and the reaction materials are sodium sulfate, potassium nitrate and glucose; the sulfate-reducing bacteria use electrons provided by an organic carbon source (such as glucose) to reduce sodium sulfate to sulfide under anaerobic conditions; sulfide acts as an electron acceptor, and under the action of denitrifying thiobacillus, electrons are provided by nitrate nitrogen in the water sample, and nitrate nitrogen is converted into nitrogen gas under the action of sulfur-autotrophic denitrifying bacteria, and sulfide is finally converted into sulfate ions.

[0062] Furthermore, the first UASB reactor 102 and the second UASB reactor 202 are both provided with a double-layer insulation structure made of acrylic material, which provides a stable temperature environment for the advanced oxidation reaction and the sulfur cycle biological denitrification reaction, is conducive to the reaction, and improves the treatment effect and system stability.

[0063] Furthermore, a stirrer 209 is provided in the dissolving water tank 203 to fully dissolve the reaction materials, ensure uniform dispersion of the reaction materials, improve reaction efficiency, and ensure smooth progress of the sulfur cycle biological denitrification reaction.

[0064] The above also has the following designs: 1. The water inlet tank, the dissolving water tank 203 and the water outlet tank 208 are made of high-quality PVC material; 2. The water bath box 205 is a 304 stainless steel frame.

[0065] Example 4

[0066] The diluted electroplating wastewater containing 15 mg / L nickel was first adjusted to pH 8 with H2SO4 and NaOH solution, and 0.5 g / L of CaFeCo composite material and 3 ml / L of NaClO solution were added to the first UASB reactor 102. The hydraulic retention time was 90 min, the speed of the first feed pump 101 was 100 rpm, the temperature was room temperature, and the first UASB reactor 102 was used as a cycle from the beginning of water inflow to the end of water outflow, and the cycle time was 5 h. The treated electroplating wastewater was used as a sulfur cycle. For the influent of the microbial denitrification process, the first UASB reactor 102 is connected to the dissolution water tank 203. 0.1 g / L of sodium sulfate, 0.06 g / L of potassium nitrate, and glucose are added to the dissolution water tank 203 at a C / N ratio of 1.5. The wastewater after the addition of the reagents enters the second UASB reactor 202 via the second feed pump 201. The hydraulic retention time is 720 min and the temperature is room temperature. After the wastewater is treated with advanced oxidation and sulfur cycle biological denitrification, the nickel removal rate is 96.9% and the nitrate nitrogen removal rate is 98.24%.

[0067] Example 5

[0068] The diluted electroplating wastewater containing 15 mg / L nickel was first adjusted to pH 8 with H2SO4 and NaOH solution, and 0.4 g / L of CaFeCo composite material and 3 ml / L of NaClO solution were added to the first UASB reactor 102. The hydraulic retention time was 90 min, the speed of the first feed pump 101 was 100 rpm, the temperature was room temperature, and the first UASB reactor 102 was used as a cycle from the beginning of water inflow to the end of water outflow, and the cycle time was 5 h. The treated electroplating wastewater was used as a sulfur cycle. For the influent of the microbial denitrification process, the first UASB reactor 102 is connected to the dissolution water tank 203. 0.1 g / L of sodium sulfate, 0.06 g / L of potassium nitrate, and glucose are added to the dissolution water tank 203 at a C / N ratio of 1.5. The wastewater after the addition of the reagents enters the second UASB reactor 202 via the second feed pump 201. The hydraulic retention time is 480 minutes and the temperature is room temperature. After the wastewater is treated with advanced oxidation and sulfur cycle biological denitrification, the nickel removal rate is 94.2% and the nitrate nitrogen removal rate is 93.75%.

[0069] Example 6

[0070] like Figure 11 As shown, a wastewater treatment method coupled with advanced oxidation and sulfur cycle with advanced wastewater treatment is used to treat water using the wastewater treatment system of the above embodiment. The method steps are as follows:

[0071] S1, adding an advanced oxidation reactant into the first UASB reactor 102;

[0072] S2, the first feed pump 101 transports the wastewater to be treated to the first UASB reactor 102, and an advanced oxidation reaction is performed in the first UASB reactor 102;

[0073] S3, the delivery pump 300 delivers the treated wastewater after the advanced oxidation reaction to the dissolving water tank 203;

[0074] S4, adding reaction materials into the dissolving water tank 203;

[0075] S5, the second feed pump 201 delivers the wastewater being treated to the second UASB reactor 202, where a sulfur cycle biological denitrification reaction is carried out;

[0076] S6, the effluent from the sulfur cycle enters the chemical precipitation unit, where calcium salt is added to generate calcium sulfate precipitation;

[0077] S7, the supernatant of the sedimentation enters the activated carbon adsorption unit to adsorb residual organic matter and heavy metals;

[0078] S8, after adsorption, the water flows through the ultraviolet disinfection unit for sterilization;

[0079] S9. The effluent is discharged after it meets the monitoring standards.

[0080] Example 7, structure and principle of wastewater deep treatment subsystem:

[0081] Chemical precipitation unit operation: Sulfur recycle effluent from the second UASB reactor flows into the precipitation reaction tank. 10% CaCl2 solution is added, and a mechanical stirrer is operated at 120 rpm for 30 minutes to ensure a uniform reaction. The sulfate concentration is reduced from 380 mg / L to 42 mg / L.

[0082] Activated carbon adsorption unit operation: The supernatant is pumped into the adsorption tower and filled with activated carbon with a particle size of 2-4 mm to adsorb residual organic matter and heavy metals.

[0083] UV disinfection unit operation: water flows through the 254nm UV lamp group, and the total number of bacteria after sterilization is reduced from 10 5 The CFU / mL dropped to <100 CFU / mL.

[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An advanced oxidation and sulfur cycle coupled wastewater treatment system with advanced wastewater treatment, characterized in that: The wastewater treatment system comprises: An advanced oxidation system is provided for implementing an advanced oxidation reaction based on a first UASB reactor, the advanced oxidation system comprising: a first feed pump, a first UASB reactor, and a first feeding device, wherein the first feed pump is used to transport the wastewater to be treated to the first UASB reactor, and the first feeding device is used to add an advanced oxidation reactant into the first UASB reactor to cause the advanced oxidation reaction to occur in the first UASB reactor; A sulfur cycle biological denitrification system is provided, which realizes the sulfur cycle biological denitrification reaction based on a second UASB reactor. The sulfur cycle biological denitrification system comprises: a second feed pump, a second UASB reactor, a dissolving water tank, and a second feeding device. The second feeding device is used to add reaction materials into the dissolving water tank. The second feed pump is used to transport the wastewater under treatment from the dissolving water tank to the second UASB reactor, so that the wastewater under treatment and the reaction bacteria in the second UASB reactor undergo the sulfur cycle biological denitrification reaction. A delivery pump, used for delivering the treated wastewater after the advanced oxidation reaction to the dissolving water tank; Wastewater advanced treatment subsystem, including: Chemical precipitation unit: receives the effluent from the sulfur cycle biological denitrification system and adds calcium salt to generate calcium sulfate precipitation; Activated carbon adsorption unit: filled with activated carbon to adsorb residual organic matter and heavy metals; Ultraviolet disinfection unit: equipped with ultraviolet lamp group to sterilize the outlet water.

2. The wastewater treatment system according to claim 1, characterized in that The advanced oxidation system further includes a first circulation pump for transporting the treated wastewater flowing out of the first UASB reactor back to the first UASB reactor for an advanced oxidation reaction.

3. The wastewater treatment system according to claim 1, characterized in that The sulfur cycle biological denitrification system also includes: a sludge circulation pump, a water bath, and a second circulation pump; the sludge circulation pump is used to transport the sludge flowing out of the second UASB reactor back to the second UASB reactor; the water bath is used to keep the second UASB reactor warm; and the second circulation pump is used to circulate hot water heated by the water bath in the second UASB reactor.

4. The wastewater treatment system according to claim 1, characterized in that The first UASB reactor and the second UASB reactor are both provided with a gas outlet and a sampling port.

5. The wastewater treatment system according to claim 4, characterized in that: The gas outlet of the first UASB reactor and the gas outlet of the second UASB reactor are both connected to a wet gas flow meter through a rubber hose.

6. The wastewater treatment system according to claim 1, characterized in that: The advanced oxidation reaction agent is CaFeCo and sodium hypochlorite, wherein the CaFeCo is a layer block structure, wherein the molar ratio of calcium, iron and cobalt is 4:1:

2.

7. The wastewater treatment system according to claim 1, characterized in that: The reaction bacteria are anaerobic bacteria mixed with sulfate-reducing bacteria and denitrifying thiobacillus, and the reaction materials are sodium sulfate, potassium nitrate and glucose.

8. The wastewater treatment system according to claim 1, characterized in that: The first UASB reactor and the second UASB reactor are both provided with a double-layer insulation structure made of acrylic material.

9. The wastewater treatment system according to claim 1, characterized in that: The dissolving water tank is provided with a stirrer for fully dissolving the reaction materials.

10. A wastewater treatment method coupled with advanced oxidation and sulfur cycle with advanced wastewater treatment, characterized in that: Water treatment is performed using the wastewater treatment system according to any one of claims 1 to 9, wherein the method steps are as follows: S1, adding an advanced oxidation reactant into the first UASB reactor; S2, the first feed pump transports the wastewater to be treated to the first UASB reactor, and the advanced oxidation reaction is carried out in the first UASB reactor; S3, the delivery pump delivers the treated wastewater after the advanced oxidation reaction to the dissolving water tank; S4, adding reaction materials into the dissolving water tank; S5, the second feed pump transports the wastewater under treatment to the second UASB reactor, and the sulfur cycle biological denitrification reaction is carried out in the second UASB reactor; S6, the effluent from the sulfur cycle enters the chemical precipitation unit, where calcium salt is added to generate calcium sulfate precipitation; S7, the supernatant of the sedimentation enters the activated carbon adsorption unit to adsorb residual organic matter and heavy metals; S8, after adsorption, the water flows through the ultraviolet disinfection unit for sterilization; S9. The effluent is discharged after it meets the monitoring standards.

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