Treatment device and treatment method for sulfur-containing wastewater

Abstract

The present invention relates to a treatment device and treatment method for sulfur-containing wastewater. The treatment device comprises a primary digestion tank, a secondary digestion tank, a deep digestion tank and an ascending-flow sedimentation tank, wherein in the secondary digestion tank, the ratio of the sulfide content of wastewater to be treated to the nitrate nitrogen content thereof can be adjusted to a state most suitable for a synchronous nitrification / short-cut sulfur-driven autotrophic denitrification / anaerobic ammonia oxidation reaction or synchronous nitrification / sulfur-driven autotrophic denitrification reaction, and the biochemical reactions are completed in the primary digestion tank; and the deep digestion tank can continue to remove residual pollutants and adsorb elemental sulfur particles generated during the biochemical reaction processes. The treatment device and the treatment method provided in the present invention can thoroughly remove sulfides, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen at the same time, and are high in terms of integration level, relatively small in terms of an occupied area, and relatively low in terms of energy consumption during operation.

Description

A device for treating sulfur-containing wastewater and a method for treating sulfur-containing wastewater

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202311422813.5 filed with the Chinese Patent Office on October 31, 2023, entitled "A device for treating sulfur-containing wastewater and a method for treating sulfur-containing wastewater", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present invention relates to the technical field of sewage treatment, and in particular to a device for treating sulfur-containing wastewater and a method for treating sulfur-containing wastewater. Background Art

[0004] Wastewater treatment utilizes physical, chemical, and biological methods to treat wastewater, purify it, reduce pollution, and ultimately recycle and reuse it, fully utilizing water resources. Wastewater can be categorized into domestic and industrial wastewater based on its source. Industrial wastewater, in turn, includes electroplating wastewater and heavy metal wastewater. Due to the varying composition of wastewater from different sources, different treatment methods are required.

[0005] The oil refining, petrochemical, pharmaceutical, fuel, and leather industries generate large amounts of wastewater containing sulfur ions during production, also known as sulfur-containing wastewater. Sulfur-containing wastewater is a common type of wastewater in industrial production. Wastewater containing sulfides is highly toxic and corrosive. Sulfur in wastewater exists in various forms, with hydrogen sulfide being the most harmful. Wastewater with high sulfide content can corrode metal pipes and equipment, causing significant economic losses. Furthermore, the presence of microorganisms in the storage environment of sulfur-containing wastewater can produce sulfate-reducing bacteria, which can reduce sulfate to sulfide or hydrogen sulfide, increasing the acidity of the wastewater and posing a significant threat to the environment.

[0006] Currently, the more common treatment methods for sulfur-containing wastewater include chemical precipitation, electrochemical oxidation, and biochemical methods. Chemical precipitation primarily uses quicklime, ferrous sulfate, and other reagents to react with sulfur ions to form a precipitate, which is then separated from the wastewater. Electrochemical oxidation uses oxygen from the air, hydrogen peroxide, and other methods to oxidize the sulfide in the sulfur-containing wastewater to produce sulfate. Sulfate is in a dissolved state and requires other methods to remove it. Biochemical treatment involves using sulfur-autotrophic denitrifying bacteria in an anaerobic environment to oxidize sulfur ions into elemental sulfur, which is then precipitated and removed. Since wastewater contains not only sulfur but also a large amount of ammonia nitrogen compounds, there is currently no technology that can easily and conveniently achieve denitrification and sulfur removal.

[0007] Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a device for treating sulfur-containing wastewater and a method for treating sulfur-containing wastewater.

[0009] In a first aspect, the present invention provides a device for treating sulfur-containing wastewater, the device comprising: a primary digestion tank, a secondary digestion tank, a deep digestion tank and an upflow sedimentation tank, wherein:

[0010] The deep digestion tank and the upflow sedimentation tank are located inside the primary digestion tank, and the upflow sedimentation tank is located above the deep digestion tank and is connected to the deep digestion tank through a three-phase separator. The primary digestion tank is connected to the deep digestion tank, and the upflow sedimentation tank is provided with an overflow port leading to the outside of the primary digestion tank;

[0011] The top surface of the upflow sedimentation tank is sealed and has a diameter larger than that of the bottom surface. The interior of the deep digestion tank is filled with aerobic granular sludge. The bottom of the deep digestion tank is connected to a mud discharge pipe, and a submersible sewage pump and a mud discharge valve are provided on the mud discharge pipe.

[0012] The secondary digestion tank is arranged upstream of the primary digestion tank and is connected to the primary digestion tank through a three-stage water inlet channel;

[0013] A primary MABR is arranged inside the primary digestion tank, and the primary MABR is arranged in a cavity formed by the inner wall of the primary digestion tank, the outer wall of the deep digestion tank and the outer wall of the upflow sedimentation tank. A secondary MABR is arranged inside the secondary digestion tank.

[0014] In the present invention, the sulfur-containing wastewater to be treated can enter the secondary digestion tank and be adjusted in the secondary digestion tank so that the ratio of the sulfide and nitrate nitrogen contents contained therein is adjusted to a state most suitable for simultaneous nitrification-short-range sulfur autotrophic denitrification-anaerobic ammonium oxidation reaction or simultaneous nitrification-sulfur autotrophic denitrification reaction, and then the simultaneous nitrification-short-range sulfur autotrophic denitrification-anaerobic ammonium oxidation reaction or simultaneous nitrification-sulfur autotrophic denitrification reaction is carried out in the primary digestion tank, and then the reaction liquid flows into the deep digestion tank, in which the residual pollutants can continue to be removed and the sulfur element particles generated in the primary digestion tank can be adsorbed.

[0015] Therefore, the sulfur-containing wastewater treatment device provided by the present invention can simultaneously achieve the full removal of sulfide, ammonia nitrogen and nitrite nitrogen. Not only that, it can also achieve the partial removal of sulfate without producing any by-products, and can also operate normally under the premise of a low COD value, and has a small footprint and low energy and drug consumption.

[0016] As a preferred technical solution of the present invention, the treatment device also includes an organic carbon source dosing box, which is connected to the secondary digestion tank through an organic carbon source dosing pipe, and an organic carbon source dosing pump and an organic carbon source dosing valve are provided on the organic carbon source dosing pipe.

[0017] As a preferred technical solution of the present invention, energy storage pipes are provided on the outer walls of the deep digestion tank and the upflow sedimentation tank, the water inlet of the energy storage pipe is provided in the cavity formed by the outer wall of the upflow sedimentation tank and the inner wall of the primary digestion tank, and the horizontal height of the water inlet is higher than the horizontal height of the overflow port of the upflow sedimentation tank, and the water outlet of the energy storage pipe is connected to the bottom of the deep digestion tank.

[0018] As a preferred technical solution of the present invention, the primary MABR includes a top plate and a bottom plate, the bottom plate of the primary MABR is fixed to the bottom of the primary digestion tank, the top plate of the primary MABR is fixed to the top of the primary digestion tank and / or the outer wall of the deep digestion tank, the inner layer of the primary MABR is inoculated with nitrifying bacteria, and the outer layer of the primary MABR is inoculated with sulfur autotrophic denitrifying bacteria and anaerobic ammonia oxidizing bacteria.

[0019] The secondary MABR includes a top plate and a bottom plate. The bottom plate of the secondary MABR is fixed to the bottom of the secondary digestion tank, and the top plate of the secondary MABR is fixed to the top of the secondary digestion tank. The inner layer of the secondary MABR is inoculated with nitrifying bacteria, and the outer layer of the secondary MABR is inoculated with sulfate-reducing bacteria and denitrifying bacteria.

[0020] The sulfur-containing wastewater treatment device provided by the present invention cleverly utilizes sulfate-reducing bacteria, which can not only achieve the purpose of removing part of the sulfate, but also supplement the reaction substrate for the sulfur autotrophic denitrifying bacteria.

[0021] As a preferred technical solution of the present invention, the treatment device further includes a primary MABR aeration device, a primary inner cavity aeration device, a secondary MABR aeration device and a secondary inner cavity aeration device.

[0022] The primary MABR aeration device is connected to the bottom plate of the primary MABR, and the air distribution pipe of the primary inner cavity aeration device is arranged at the bottom of the deep digestion tank.

[0023] The secondary MABR aeration device is connected to the bottom plate of the secondary MABR, and the air distribution pipe of the secondary inner cavity aeration device is arranged at the bottom of the secondary digestion tank.

[0024] As a preferred technical solution of the present invention, the treatment device further includes a primary water inlet channel connected to the primary digestion tank, and the water outlet of the primary water inlet channel is located at the bottom of the primary digestion tank.

[0025] The treatment device also includes a secondary water inlet channel and a tertiary water inlet channel connected to the secondary digestion tank. The water inlet of the secondary water inlet channel is connected to the primary water inlet channel, and the water outlet is located at the bottom of the secondary digestion tank. The water inlet of the tertiary water inlet channel is located at the top of the secondary digestion tank, and the water outlet is connected to the primary water inlet channel. The connecting port between the secondary water inlet channel and the primary water inlet channel is located upstream of the connecting port between the tertiary water inlet channel and the primary water inlet channel.

[0026] A primary control valve is provided on the primary water inlet channel, and the primary control valve is located between the water inlet of the secondary water inlet channel and the water outlet of the tertiary water inlet channel. A secondary control valve is provided on the secondary water inlet channel, and the secondary control valve is adjacent to the water inlet of the secondary water inlet channel. A tertiary control valve is provided on the tertiary water inlet channel, and the tertiary control valve is adjacent to the water outlet of the tertiary water inlet channel.

[0027] In the present invention, the function of the control valve is to control whether water needs to flow through a switch.

[0028] The treatment device also includes a fourth-level water inlet channel connecting the secondary digestion tank and the third-level water inlet channel. The connecting port between the fourth-level water inlet channel and the third-level water inlet channel is located between the water inlet of the third-level water inlet channel and the third-level control valve. A fourth-level control valve is provided on the fourth-level water inlet channel, and the fourth-level control valve is adjacent to the water outlet of the fourth-level water inlet channel.

[0029] As a preferred technical solution of the present invention, a primary total nitrogen detector, a primary COD detector, a primary sulfide detector and a primary sulfate detector are provided on the primary water inlet channel, and the primary total nitrogen detector, the primary COD detector, the primary sulfide detector and the primary sulfate detector are located between the water inlet of the primary water inlet channel and the water inlet of the secondary water inlet channel.

[0030] In the present invention, the primary total nitrogen detector, primary COD detector, primary sulfide detector and primary sulfate detector are used to monitor the total nitrogen concentration (mg / L), COD value (mg / L), sulfide ion concentration (mg / L) and sulfate ion concentration (mg / L) of the initial influent.

[0031] A secondary total nitrogen detector and a secondary sulfide detector are provided on the three-stage water inlet channel, and the secondary total nitrogen detector and the secondary sulfide detector are located at the water inlet of the three-stage water inlet channel.

[0032] In the present invention, the secondary total nitrogen detector and the secondary sulfide detector are used to detect the total nitrogen concentration (mg / L) and the sulfide ion concentration (mg / L) at the water outlet of the secondary digestion tank.

[0033] In a second aspect, the present invention provides a method for treating sulfur-containing wastewater, wherein the method is performed using the sulfur-containing wastewater treatment device described in the first aspect, wherein the treatment device is controlled by a PLC system, and the PLC system operates according to the following formula:

[0034] in:

[0035] S1 is the sulfur ion concentration of the initial influent sulfur-containing wastewater, mg / L;

[0036] N1 is the total nitrogen concentration of the initial influent sulfur-containing wastewater, mg / L;

[0037] C is the COD value of the initial influent sulfur-containing wastewater, mg / L;

[0038] S2 is the sulfur ion concentration at the outlet of the secondary digestion tank, mg / L;

[0039] N2 is the total nitrogen concentration at the outlet of the secondary digestion tank, mg / L.

[0040] As a preferred technical solution of the present invention, when the PLC system issues an instruction to run the first-level program, the primary control valve is opened, the secondary control valve and the tertiary control valve are closed, and the secondary MABR aeration device and the secondary inner cavity aeration device are closed;

[0041] When the PLC system issues an instruction to run the secondary program, the primary control valve and the fourth-stage control valve are closed, the secondary control valve and the third-stage control valve are opened, and the secondary MABR aeration device and the secondary inner cavity aeration device are opened;

[0042] When the PLC system issues an instruction to run the third-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed;

[0043] When the PLC system issues an instruction to run the fourth-level program, the primary control valve and the third-level control valve are closed, the secondary control valve and the fourth-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed. The aeration rate of the secondary inner cavity aeration device decreases at a preset slope;

[0044] When the PLC system issues an instruction to run the five-level program, the primary control valve and the tertiary control valve are closed, the secondary control valve and the quaternary control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed. The aeration rate of the secondary inner cavity aeration device is increased at a preset slope;

[0045] When the PLC system issues an instruction to run the six-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, and the organic carbon source dosing box adds organic carbon source at a preset dosage;

[0046] When the PLC system issues an instruction to run the seven-level program, the primary control valve and the tertiary control valve are closed, the secondary control valve and the quaternary control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, the aeration rate of the secondary inner cavity aeration device is increased at a preset slope, and the organic carbon source dosing box adds organic carbon source at a preset dosage;

[0047] In the treatment method, the primary MABR aeration device and the primary inner cavity aeration device are in continuous operation, and the wastewater to be treated enters the primary digestion tank directly or enters the primary digestion tank after being treated in the secondary digestion tank, and then flows through the primary digestion tank, the energy storage pipe, the deep digestion tank, the three-phase separator and the upflow sedimentation tank under the action of gravity.

[0048] As a preferred technical solution of the present invention, the COD equivalent of the preset dosing amount of the organic carbon source dosing box is not less than (4×N1-C) mg / L and not higher than (4×N1-C+2×SP) mg / L, where SP is the initial sulfate ion concentration of the influent, mg / L.

[0049] As a preferred technical solution of the present invention, the aerobic granular sludge contained in the deep digestion tank is intercepted by the three-phase separator, settled in a preset period and discharged from the deep digestion tank through the sludge discharge pipe. The preset period is 40 to 50 days, and the sulfur elemental particles attached to the surface of the aerobic granular sludge are separated and recovered.

[0050] In the processing method provided by the present invention, the processing method is controlled by a PLC system and comprises the following steps:

[0051] S1, the primary sulfide detector records the influent sulfide ion concentration S1 (mg / L) at a fixed frequency, the primary total nitrogen detector records the influent total nitrogen concentration N1 (mg / L) at a fixed frequency, the primary COD detector records the influent COD value C (mg / L) at a fixed frequency, the primary sulfate detector records the influent sulfate ion concentration SP (mg / L) at a fixed frequency, the secondary sulfide detector records the sulfide ion concentration S2 (mg / L) in the secondary digestion tank at a fixed frequency, the secondary total nitrogen detector records the total nitrogen concentration N2 (mg / L) in the secondary digestion tank at a fixed frequency, and sends a feedback signal to the PLC system;

[0052] S2, after the PLC system receives the signal, it runs the first-level program, second-level program, third-level program, fourth-level program, fifth-level program, sixth-level program and seventh-level program respectively according to the following formula:

[0053] In S3, the primary MABR aeration device and the primary inner cavity aeration device are in continuous operation, and the treated water enters the primary digestion tank directly or enters the primary digestion tank after being treated in the secondary digestion tank. Then, under the action of gravity, it flows through the primary digestion tank, the energy storage pipe, the deep digestion tank, the three-phase separator and the upflow sedimentation tank.

[0054] The technical solution provided by the embodiment of the present invention has the following advantages compared with the existing technology:

[0055] (1) The treatment device provided by the present invention can not only remove the total nitrogen contained in sewage, but also treat sulfur-containing wastewater, and can fully remove the sulfide in the sulfur-containing wastewater, thereby achieving the comprehensive removal of sulfide and total nitrogen (ammonia nitrogen, nitrite nitrogen and nitrate nitrogen).

[0056] (2) The sulfur-containing wastewater treatment device provided by the present invention can not only remove part of the sulfate in the sulfur-containing wastewater, but also convert this part of the sulfate into sulfide by-products for use.

[0057] (3) The sulfur-containing wastewater treatment device provided by the present invention can operate normally even when the COD content of the wastewater to be treated is low, without the need to supplement an organic carbon source or only accurately supplementing a small amount of an organic carbon source under specific circumstances. The wastewater to be treated does not need to carry activated sludge for reflow, and can achieve continuous water discharge, thereby avoiding the waste of activated sludge and significantly saving energy and drug consumption.

[0058] (4) The processing device provided by the present invention is highly integrated and can significantly save floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0061] FIG1 is a schematic structural diagram of a device for treating sulfur-containing wastewater according to an embodiment of the present invention;

[0062] FIG2 is a program control diagram of the sulfur-containing wastewater treatment device according to an embodiment of the present invention for treating sulfur-containing wastewater.

[0063] Among them: 1-primary digestion tank; 101-primary MABR; 102-primary MABR aeration device; 103-primary water inlet channel; 1031-primary control valve; 104-primary total nitrogen monitor; 105-primary COD detector; 106-primary sulfide detector; 107-primary sulfate detector; 2-secondary digestion tank; 201-secondary MABR; 202-secondary MABR aeration device; 203-secondary inner cavity aeration device; 204-secondary water inlet channel; 2041-secondary control valve; 205-tertiary water inlet channel; 2051-tertiary control valve; 206-quaternary water inlet channel; 2061-quaternary control valve; 207-secondary total nitrogen detector; 208-secondary sulfide detector; 3-deep digestion tank; 301-sludge discharge pipe; 3011-sludge discharge valve; 3012-submersible sewage pump; 302-primary inner cavity aeration device; 4-upwelling sedimentation tank; 5-three-phase separator; 6-organic carbon source dosing box; 601-organic carbon source dosing pipe; 6011-organic carbon source dosing valve; 6012-organic carbon source dosing pump; 7-energy storage pipe. DETAILED DESCRIPTION

[0064] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0065] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0066] Example 1

[0067] This embodiment provides a treatment device for treating sulfur-containing wastewater.

[0068] As shown in FIG1 , the treatment device includes a primary digestion tank 1, a secondary digestion tank 2, a deep digestion tank 3 and an upflow sedimentation tank 4, wherein:

[0069] The deep digestion tank 3 and the upflow sedimentation tank 4 are located inside the primary digestion tank 1, and the upflow sedimentation tank 4 is located above the deep digestion tank 3 and is connected to the deep digestion tank 3 through a three-phase separator 5. The upflow sedimentation tank 4 is provided with an overflow port leading to the outside of the primary digestion tank 1;

[0070] An energy storage pipe 7 is provided on the outer walls of the deep digestion tank 3 and the upflow sedimentation tank 4. The water inlet of the energy storage pipe 7 is provided in the cavity formed by the outer wall of the upflow sedimentation tank 4 and the inner wall of the primary digestion tank 1, and the horizontal height of the water inlet is higher than the horizontal height of the overflow port of the upflow sedimentation tank 4. The water outlet of the energy storage pipe 7 is connected to the bottom of the deep digestion tank 3. In the treatment device, the wastewater to be treated can flow from the primary digestion tank into the deep digestion tank through the energy storage pipe, and then enter the upflow sedimentation tank through the three-phase separator, and finally flow out of the primary digestion tank through the overflow port;

[0071] The top surface of the upflow sedimentation tank 4 is sealed and has a larger diameter than the bottom surface. The interior of the deep digestion tank 3 is filled with aerobic granular sludge. The bottom of the deep digestion tank 3 is connected to a sludge discharge pipe 301. The sludge discharge pipe 301 is provided with a sludge discharge valve 3011 and a submersible sewage pump 3012. The aerobic granular sludge filled in the deep digestion tank can be discharged regularly through the sludge discharge pipe. At the same time, sulfur particles attached to the surface of the sludge can be separated and recovered.

[0072] A primary MABR 101 is provided inside the primary digestion tank 1. The primary MABR 101 is provided in a cavity formed by the inner wall of the primary digestion tank 1, the outer wall of the deep digestion tank 3 and the outer wall of the upwelling sedimentation tank 4. The primary MABR 101 includes a top plate, a bottom plate and multiple groups of MABR membranes. The bottom plate of the primary MABR 101 is fixed to the bottom of the primary digestion tank 1, and the top plate of the primary MABR 101 is fixed to the top of the primary digestion tank 1 and / or the outer wall of the deep digestion tank 3. The inner layer of the primary MABR 101 is inoculated with nitrifying bacteria, and the outer layer of the primary MABR 101 is inoculated with sulfur autotrophic denitrifying bacteria and anaerobic ammonia oxidizing bacteria.

[0073] The secondary digestion tank 2 is arranged upstream of the primary digestion tank 1 and is connected to the primary digestion tank 1 through a tertiary water inlet channel 205. A secondary MABR 201 is arranged inside the secondary digestion tank 2. The secondary MABR 201 includes a top plate and a bottom plate. The bottom plate of the secondary MABR 201 is fixed to the bottom of the secondary digestion tank 2, and the top plate of the secondary MABR 201 is fixed to the top of the secondary digestion tank 2. The inner layer of the secondary MABR 201 is inoculated with nitrifying bacteria, and the outer layer of the secondary MABR 201 is inoculated with sulfate-reducing bacteria and denitrifying bacteria.

[0074] The treatment device further includes an organic carbon source dosing box 6, which is connected to the secondary digestion tank 2 through an organic carbon source dosing pipe 601, and an organic carbon source dosing valve 6011 and an organic carbon source dosing pump 6012 are provided on the organic carbon source dosing pipe 601;

[0075] The treatment device also includes a primary MABR aeration device 102, a primary inner cavity aeration device 302, a secondary MABR aeration device 202 and a secondary inner cavity aeration device 203;

[0076] The primary MABR aeration device 102 is connected to the bottom plate of the primary MABR 101, and the air distribution pipe of the primary inner cavity aeration device 302 is arranged at the bottom of the deep digestion tank 3;

[0077] The secondary MABR aeration device 202 is connected to the bottom plate of the secondary MABR 201, and the air distribution pipe of the secondary inner cavity aeration device 203 is arranged at the bottom of the secondary digestion tank 2;

[0078] The treatment device further includes a primary water inlet channel 103 connected to the primary digestion tank 1, and the water outlet of the primary water inlet channel 103 is located at the bottom of the primary digestion tank 1;

[0079] The treatment device also includes a secondary water inlet channel 204 connected to the secondary digestion tank 2, the water inlet of the secondary water inlet channel 204 is connected to the primary water inlet channel 103, and the water outlet is located at the bottom of the secondary digestion tank 2, the water inlet of the tertiary water inlet channel 205 is located at the top of the secondary digestion tank 2, and the water outlet is connected to the primary water inlet channel 103, and the connecting port between the secondary water inlet channel 204 and the primary water inlet channel 103 is located upstream of the connecting port between the tertiary water inlet channel 205 and the primary water inlet channel 103;

[0080] A primary control valve 1031 is provided on the primary water inlet channel 103, and the primary control valve 1031 is located between the water inlet of the secondary water inlet channel 204 and the water outlet of the tertiary water inlet channel 205. A secondary control valve 2041 is provided on the secondary water inlet channel 204, and a tertiary control valve 2051 is provided on the tertiary water inlet channel 205.

[0081] The treatment device further includes a fourth-level water inlet channel 206 connecting the secondary digestion tank 2 and the third-level water inlet channel 205. The communication port between the fourth-level water inlet channel 206 and the third-level water inlet channel 205 is located between the water inlet of the third-level water inlet channel 205 and the third-level control valve 2051. The fourth-level water inlet channel 206 is provided with a fourth-level control valve 2061.

[0082] A primary total nitrogen detector 104, a primary COD detector 105, a primary sulfide detector 106 and a primary sulfate detector 107 are provided on the primary water inlet channel. The primary total nitrogen detector 104, the primary COD detector 105, the primary sulfide detector 106 and the primary sulfate detector 107 are located between the water inlet of the primary water inlet channel 103 and the water inlet of the secondary water inlet channel 204;

[0083] A secondary total nitrogen detector 207 and a secondary sulfide detector 208 are provided on the tertiary water inlet channel 205 , and the secondary total nitrogen detector 207 and the secondary sulfide detector 208 are located at the water inlet of the tertiary water inlet channel 205 .

[0084] Example 2

[0085] This embodiment provides a method for treating sulfur-containing wastewater using the sulfur-containing wastewater treatment device provided in Example 1.

[0086] S1, the primary sulfide detector records the inlet sulfide ion concentration S1 (mg / L) at a fixed frequency, the primary total nitrogen detector records the inlet total nitrogen concentration N1 (mg / L) at a fixed frequency, the primary COD detector records the inlet COD value C (mg / L) at a fixed frequency, the primary sulfate detector records the inlet sulfate ion concentration SP (mg / L) at a fixed frequency, the secondary sulfide detector records the sulfide ion concentration S2 (mg / L) at the water outlet of the secondary digestion tank at a fixed frequency, the secondary total nitrogen detector records the total nitrogen concentration N2 (mg / L) at the water outlet of the secondary digestion tank at a fixed frequency, and sends a feedback signal to the PLC system;

[0087] S2, after receiving the signal, the PLC system runs the first-level program, second-level program, third-level program, fourth-level program, fifth-level program, sixth-level program and seventh-level program respectively according to the program shown in Figure 2:

[0088] The operation methods of each program are as follows:

[0089] When the PLC system issues an instruction to run the first-level program, the primary control valve is opened, the secondary control valve and the tertiary control valve are closed, and the secondary MABR aeration device and the secondary inner cavity aeration device are closed;

[0090] When the PLC system issues an instruction to run the secondary program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, and the secondary MABR aeration device and the secondary inner cavity aeration device are opened;

[0091] When the PLC system issues an instruction to run the third-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed;

[0092] When the PLC system issues an instruction to run the fourth-level program, the primary control valve and the third-level control valve are closed, the secondary control valve and the fourth-level control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, and the aeration rate of the secondary inner cavity aeration device decreases at a preset slope;

[0093] When the PLC system issues an instruction to run the five-level program, the primary control valve and the tertiary control valve are closed, the secondary control valve and the quaternary control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, and the aeration rate of the secondary inner cavity aeration device is increased at a preset slope;

[0094] When the PLC system issues an instruction to run the six-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, and the organic carbon source dosing box adds organic carbon source at a preset dosage;

[0095] When the PLC system issues an instruction to run the seven-level program, the primary control valve and the tertiary control valve are closed, the secondary control valve and the quaternary control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, the aeration rate of the secondary inner cavity aeration device is increased at a preset slope, and the organic carbon source dosing box adds the organic carbon source at a preset dosage, wherein the COD equivalent of the preset organic carbon source dosage is not less than (4×N1-C) mg / L and not more than (4×N1-C+2×SP) mg / L;

[0096] During the operation of the above program, the primary MABR aeration device and the primary inner cavity aeration device are in continuous operation, and the wastewater to be treated enters the primary digestion tank directly or enters the primary digestion tank after being treated in the secondary digestion tank, and then flows through the primary digestion tank, the energy storage pipe, the deep digestion tank, the three-phase separator and the upflow sedimentation tank under the action of gravity;

[0097] S3, the aerobic granular sludge contained in the deep digestion tank is intercepted by the three-phase separator, settled in a preset period and discharged from the deep digestion tank through the sludge discharge pipe. The preset period is 40 to 50 days, and the sulfur particles attached to the surface of the aerobic granular sludge are separated and recovered.

[0098] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0099] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A device for treating sulfur-containing wastewater, characterized in that: The treatment device comprises: a primary digestion tank (1), a secondary digestion tank (2), a deep digestion tank (3) and an upflow sedimentation tank (4), wherein: The deep digestion tank (3) and the upflow sedimentation tank (4) are located inside the primary digestion tank (1), and the upflow sedimentation tank (4) is located above the deep digestion tank (3) and is connected to the deep digestion tank (3) through a three-phase separator (5). The primary digestion tank (1) is connected to the deep digestion tank (3), and the upflow sedimentation tank (4) is provided with an overflow port leading to the outside of the primary digestion tank (1); The top surface of the upflow sedimentation tank (4) is sealed and has a diameter greater than the bottom surface diameter; the interior of the deep digestion tank (3) is filled with aerobic granular sludge; the bottom of the deep digestion tank (3) is connected to a sludge discharge pipe (301); and a sludge discharge valve (3011) and a submersible sewage pump (3012) are provided on the sludge discharge pipe (301); The secondary digestion tank (2) is arranged upstream of the primary digestion tank (1), and is connected to the primary digestion tank (1) via a three-stage water inlet channel (205); A primary MABR (101) is arranged inside the primary digestion tank (1), and the primary MABR (101) is arranged in a cavity formed by the inner wall of the primary digestion tank (1), the outer wall of the deep digestion tank (3), and the outer wall of the upwelling sedimentation tank (4), and a secondary MABR (201) is arranged inside the secondary digestion tank (2); The treatment device further comprises an organic carbon source dosing box (6), wherein the organic carbon source dosing box (6) is connected to the secondary digestion tank (2) via an organic carbon source dosing pipe (601), and an organic carbon source dosing valve (6011) and an organic carbon source dosing pump (6012) are arranged on the organic carbon source dosing pipe (601); The outer walls of the deep digestion tank (3) and the upflow sedimentation tank (4) are provided with energy storage pipes (7), the water inlet of the energy storage pipe (7) is arranged in a cavity formed by the outer wall of the upflow sedimentation tank (4) and the inner wall of the primary digestion tank (1), and the level of the water inlet is higher than the level of the overflow port of the upflow sedimentation tank (4), and the water outlet of the energy storage pipe (7) is connected to the upflow sedimentation tank (4). The bottom of the deep digestion tank (3).

2. The sulfur-containing wastewater treatment device according to claim 1, characterized in that: The primary MABR (101) comprises a top plate and a bottom plate, the bottom plate of the primary MABR (101) is fixed to the bottom of the primary digestion tank (1), the top plate of the primary MABR (101) is fixed to the top of the primary digestion tank (1) and / or the outer wall of the deep digestion tank (3), the inner layer of the primary MABR (101) is inoculated with nitrifying bacteria, and the outer layer of the primary MABR (101) is inoculated with sulfur autotrophic denitrifying bacteria and anaerobic ammonia oxidizing bacteria; The secondary MABR (201) comprises a top plate and a bottom plate, the bottom plate of the secondary MABR (201) is fixed to the bottom of the secondary digestion tank (2), the top plate of the secondary MABR (201) is fixed to the top of the secondary digestion tank (2), the inner layer of the secondary MABR (201) is inoculated with nitrifying bacteria, and the outer layer of the secondary MABR (201) is inoculated with sulfate-reducing bacteria and denitrifying bacteria.

3. The sulfur-containing wastewater treatment device according to claim 2, characterized in that: The treatment device also includes a primary MABR aeration device (102), a primary inner cavity aeration device (302), a secondary MABR aeration device (202) and a secondary inner cavity aeration device (203); The primary MABR aeration device (102) is connected to the bottom plate of the primary MABR (101), and the air distribution pipeline of the primary inner cavity aeration device (302) is arranged at the bottom of the deep digestion tank (3); The secondary MABR aeration device (202) is connected to the bottom plate of the secondary MABR (201), and the air distribution pipeline of the secondary inner cavity aeration device (203) is arranged at the bottom of the secondary digestion tank (2).

4. The sulfur-containing wastewater treatment device according to claim 1, characterized in that: The treatment device further comprises a primary water inlet channel (103) connected to the primary digestion tank (1), and a water outlet of the primary water inlet channel (103) is located at the bottom of the primary digestion tank (1); The treatment device further comprises a secondary water inlet channel (204) connected to the secondary digestion tank (2), the water inlet of the secondary water inlet channel (204) being in communication with the primary water inlet channel (103), and the water outlet being located at the bottom of the secondary digestion tank (2); the water inlet of the tertiary water inlet channel (205) being located at the top of the secondary digestion tank (2), and the water outlet being in communication with the primary water inlet channel (103), and the communication port between the secondary water inlet channel (204) and the primary water inlet channel (103) being located upstream of the communication port between the tertiary water inlet channel (205) and the primary water inlet channel (103); A primary control valve (1031) is provided on the primary water inlet channel (103), the primary control valve (1031) is located between the water inlet of the secondary water inlet channel (204) and the water outlet of the tertiary water inlet channel (205), a secondary control valve (2041) is provided on the secondary water inlet channel (204), and a tertiary control valve (2051) is provided on the tertiary water inlet channel (205); The treatment device further comprises a fourth-level water inlet channel (206) connecting the secondary digestion tank (2) and the third-level water inlet channel (205); a connecting port between the fourth-level water inlet channel (206) and the third-level water inlet channel (205) is located between a water inlet of the third-level water inlet channel (205) and the third-level control valve (2051); and a fourth-level control valve (2061) is provided on the fourth-level water inlet channel (206).

5. The sulfur-containing wastewater treatment device according to claim 4, characterized in that: A primary total nitrogen detector (104), a primary COD detector (105), a primary sulfide detector (106) and a primary sulfate detector (107) are arranged on the primary water inlet channel, and the primary total nitrogen detector (104), the primary COD detector (105), the primary sulfide detector (106) and the primary sulfate detector (107) are located between the water inlet of the primary water inlet channel (103) and the water inlet of the secondary water inlet channel (204); A secondary total nitrogen detector (207) and a secondary sulfide detector (208) are arranged on the tertiary water inlet channel (205), and the secondary total nitrogen detector (207) and the secondary sulfide detector (208) are located at the water inlet of the tertiary water inlet channel (205).

6. A method for treating sulfur-containing wastewater, characterized in that: The treatment method is carried out using the sulfur-containing wastewater treatment device according to any one of claims 1 to 5, and the treatment device is controlled by a PLC system, and the PLC system operates according to the following formula: in: S1 is the sulfur ion concentration of the initial influent sulfur-containing wastewater, mg / L; N1 is the total nitrogen concentration of the initial influent sulfur-containing wastewater, mg / L; C is the COD value of the initial influent sulfur-containing wastewater, mg / L; S2 is the sulfur ion concentration at the outlet of the secondary digestion tank, mg / L; N2 is the total nitrogen concentration at the outlet of the secondary digestion tank, mg / L.

7. The processing method according to claim 6, characterized in that: When the PLC system issues an instruction to run the primary program, the primary control valve opens, the secondary control valve and the tertiary control valve close, and the secondary MABR aeration device and the secondary inner cavity aeration device close; When the PLC system issues an instruction to run the secondary program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, and the secondary MABR aeration device and the secondary inner cavity aeration device are opened; When the PLC system issues an instruction to run the third-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed; When the PLC system issues an instruction to run the fourth-level program, the primary control valve and the third-level control valve are closed, the secondary control valve and the fourth-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed, and the aeration rate of the secondary inner cavity aeration device decreases at a preset slope; When the PLC system issues an instruction to run the five-level program, the primary control valve and the third-level control valve are closed, the secondary control valve and the fourth-level control valve are opened, the secondary MABR aeration device is opened, and the secondary inner cavity aeration device is closed, and the aeration rate of the secondary inner cavity aeration device is increased at a preset slope; When the PLC system issues an instruction to run the six-level program, the primary control valve and the fourth-level control valve are closed, the secondary control valve and the third-level control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, and the organic carbon source dosing box adds organic carbon source at a preset dosage; When the PLC system issues an instruction to run the seven-level program, the primary control valve and the tertiary control valve are closed, the secondary control valve and the quaternary control valve are opened, the secondary MABR aeration device is opened, the secondary inner cavity aeration device is closed, the aeration rate of the secondary inner cavity aeration device is increased at a preset slope, and the organic carbon source dosing box adds the organic carbon source at a preset dosage; In the treatment method, the primary MABR aeration device and the primary inner cavity aeration device are continuously operated, and the wastewater to be treated directly enters the primary digestion tank or enters the primary digestion tank after being treated in the secondary digestion tank, and then flows through the primary digestion tank, the energy storage pipe, the deep digestion tank, the three-phase separator and the upflow sedimentation tank under the action of gravity.

8. The processing method according to claim 7, characterized in that: The COD equivalent of the preset dosage of the organic carbon source dosing box is not less than 4×N1-C mg / L and not more than 4×N1-C+2×SP mg / L, where SP is the initial sulfate ion concentration of the influent, mg / L.

9. The processing method according to claim 7, characterized in that: The aerobic granular sludge contained in the deep digestion tank is intercepted by the three-phase separator, settled in a preset period and discharged from the deep digestion tank through the sludge discharge pipe. The preset period is 40 to 50 days. The sulfur particles attached to the surface of the aerobic granular sludge are separated and recovered.

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