Barrel washing wastewater treatment system

Abstract

The utility model relates to a barrel washing wastewater treatment system which comprises an oil separation tank, a regulating tank, a primary pump, an air flotation machine, a primary sedimentation tank, an internal electrolytic tank, a Fenton tank, a degassing tank, a secondary sedimentation tank, an intermediate tank, a secondary pump, a water distributor, MBR (Membrane Bioreactor) integrated equipment, a sludge tank, a diaphragm pump, a filter press and a dosing device, the method has the advantages that a process route of physicochemical pretreatment, biochemical treatment and deep treatment is adopted, the biodegradability of the wastewater is improved, the purification speed is high, the cost is controllable, and wastes are recycled.

Description

Technical Field

[0001] The utility model relates to a barrel-washing wastewater treatment system. Background Art

[0002] The current treatment process for barrel washing wastewater is simple. The biodegradability of wastewater is low. The harmful substances in the barrel washing wastewater cannot be effectively degraded, or have to undergo repeated filtration and degradation to meet the wastewater discharge standards, which is costly and slow in degradation. Summary of the invention

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a barrel washing wastewater treatment system, which adopts a process route of physicochemical pretreatment + biochemical treatment + deep treatment to improve the biodegradability of wastewater, has a fast purification speed, controllable costs, and recycles waste.

[0004] In order to achieve the above object, the utility model is implemented as follows: it is a barrel washing wastewater treatment system, including a grease trap, a regulating tank, a primary pump, an air flotation machine, a primary sedimentation tank, an internal electrolytic cell, a Fenton tank, a degassing tank, a secondary sedimentation tank, an intermediate tank, a secondary pump, a water distributor, an MBR integrated equipment, a sludge tank, a diaphragm pump, a filter press and a dosing device;

[0005] The inlet of the grease trap is connected to the external barrel washing wastewater, the outlet of the grease trap is connected to the regulating tank, the regulating tank is connected to the air flotation machine through a primary pump, the air flotation machine is connected to a sedimentation tank, the sedimentation tank is connected to an inner electrolytic tank, the inner electrolytic tank is connected to a Fenton tank, the Fenton tank is connected to a degassing tank, the degassing tank is connected to a second sedimentation tank, the second sedimentation tank is connected to an intermediate tank, the intermediate tank is connected to a water distributor through a secondary pump, the water distributor is connected to an MBR integrated device, and the MBR integrated device is connected to the outside world;

[0006] The sludge tank is connected with the first sedimentation tank and the second sedimentation tank respectively. The sludge tank is connected with the filter press through a diaphragm pump. The filter press is connected with the outside and the regulating tank respectively. The dosing device is connected with the first sedimentation tank, the internal electrolytic cell, the Fenton tank, the second sedimentation tank and the Fenton tank respectively.

[0007] In this technical solution, the dosing device includes a NAOH dosing device, a FeSO 4 dosing device, PAC dosing device, PAM dosing device, acid dosing device and hydrogen peroxide device; the NAOH dosing device is connected to a sedimentation tank and a Fenton tank respectively, the FeSO 4 The dosing device is connected to the first settling tank and the Fenton tank respectively, the PAC dosing device is connected to the first settling tank and the second settling tank respectively, the PAM dosing device is connected to the first settling tank and the second settling tank respectively, the acid adding device is connected to the internal electrolytic cell respectively, and the hydrogen peroxide device is connected to the Fenton tank.

[0008] In the present technical solution, the MBR integrated equipment includes an acidification tank, an aerobic tank, an MBR tank, a tertiary pump, a clear water tank and a recoil pump; the acidification tank is connected to a water distributor, the aerobic tank is connected to the acidification tank, the MBR tank is connected to the clear water tank through a tertiary pump, the clear water tank is connected to the outside world, and the clear water tank is connected to the MRR tank through a recoil pump.

[0009] In the technical solution, it also includes a fan group, which is connected to the regulating tank, the internal electrolytic cell, the Fenton tank, the degassing tank, the intermediate tank and the MBR integrated equipment respectively.

[0010] In the technical solution, it also includes an oil recovery machine, which is arranged on the oil separator.

[0011] Compared with the prior art, the utility model has the advantages of good purification effect and can effectively filter, precipitate and eliminate harmful substances in wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the dosing device of the utility model;

[0014] Figure 3 It is a structural schematic diagram of the MBR integrated equipment of the utility model. DETAILED DESCRIPTION

[0015] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] like Figure 1 and Figure 3 As shown, it is a barrel washing wastewater treatment system, which includes a grease trap 1, a regulating tank 2, a primary pump 3, an air flotation machine 4, a primary sedimentation tank 5, an internal electrolytic cell 6, a Fenton tank 7, a degassing tank 8, a secondary sedimentation tank 9, an intermediate tank 10, a secondary pump 11, a water distributor 12, an MBR integrated equipment 13, a sludge tank 14, a diaphragm pump 15, a filter press 16 and a dosing device 17;

[0017] The inlet of the grease trap 1 is connected to the external barrel washing wastewater, the outlet of the grease trap 1 is connected to the regulating tank 2, the regulating tank 2 is connected to the air flotation machine 4 through the primary pump 3, the air flotation machine 4 is connected to the first sedimentation tank 5, the first sedimentation tank 5 is connected to the inner electrolytic tank 6, the inner electrolytic tank 6 is connected to the Fenton tank 7, the Fenton tank 7 is connected to the degassing tank 8, the degassing tank 8 is connected to the secondary sedimentation tank 9, the secondary sedimentation tank 9 is connected to the intermediate tank 10, the intermediate tank 10 is connected to the water distributor 12 through the secondary pump 11, the water distributor 12 is connected to the MBR integrated equipment 13, and the MBR integrated equipment 13 is connected to the outside;

[0018] The sludge tank 14 is connected to the first sedimentation tank 5 and the second sedimentation tank 9 respectively, the sludge tank 16 is connected to the filter press 16 through the diaphragm pump 15, and the filter press 16 is connected to the outside and the regulating tank 2 respectively; the dosing device 17 is connected to the first sedimentation tank 5, the internal electrolytic cell 6, the Fenton tank 7, the second sedimentation tank 9 and the Fenton tank 7 respectively.

[0019] The barrel washing wastewater is collected through the pipe network and enters the grease trap 1. The density difference between oil and water is used to separate the floating oil with larger particle size in the wastewater, and then the floating oil recovery machine 18 is used to remove it. The grease trap 1 is mainly used to remove floating oil with larger particle size such as toluene, xylene, organic solvents, and petroleum. Then the wastewater enters the regulating tank 2 to adjust the water volume and water quality. A screen is provided in front of the grease trap.

[0020] The conditioned wastewater enters the flotation machine 4 through the primary pump 3. The flotation method is a technology for solid-liquid separation or liquid-liquid separation. It generates a large number of microbubbles, which are adsorbed on solid or liquid pollutant particles with a density close to that of water in wastewater to form a floating body with a density less than that of water. Under the action of buoyancy, the floating body floats to the water surface to form scum, and solid-liquid or liquid-liquid separation is performed. It is used to remove suspended solids, oils and fats with a smaller specific gravity from wastewater, and also has a certain removal effect on CODcr.

[0021] The flotation effluent flows by gravity into a sedimentation tank 5, where reagents are added for primary coagulation and sedimentation.

[0022] The supernatant in the sedimentation tank 5 flows by gravity into the internal electrolytic cell 6 reactor. The micro-electrolytic reactor technology is a sewage treatment technology that uses the electrochemical reaction of the galvanic cell principle to treat complex wastewater. The micro-electrolytic reactor technology uses the potential difference between iron-carbon particles to form countless tiny galvanic cells. These tiny batteries use the low-potential iron as the negative electrode and the high-potential carbon as the positive electrode to produce an electrochemical reaction in an aqueous solution containing an acidic electrolyte. As a result of the reaction, the iron is corroded and becomes a divalent iron ion that enters the solution. Since the iron ion has a coagulation effect, it attracts the weakly negatively charged particles in the pollutants to form a relatively stable flocculent (also called iron mud) for removal.

[0023] The effluent from the inner electrolytic cell 6 continues to enter the Fenton cell 7. Fenton utilizes the chain reaction between divalent iron ions (Fe2+) and hydrogen peroxide to catalyze the generation of hydroxyl radicals, which have strong oxidizing ability and can oxidize difficult-to-degrade organic matter such as benzene, toluene, xylene, nitrobenzene, and organic solvents, remove COD, and improve the biodegradability of wastewater.

[0024] The effluent from Fenton oxidation contains a large amount of gas and has a low pH value. After the Fenton reaction, it must be degassed, and alkali must be added to neutralize the effluent from the Fenton system and remove Fe3+ to reduce the impact on subsequent biochemical reactions. Suspended particles are removed by coagulation and sedimentation in the secondary sedimentation tank 9.

[0025] The effluent from the secondary sedimentation tank 9 enters the intermediate water tank for temporary storage and is then lifted to the hydrolysis acidification tank by the secondary pump 11. Under the action of hydrolysis and acid-producing bacteria, the macromolecular organic matter in the sewage is decomposed into small molecular organic matter, which significantly increases the soluble organic matter in the sewage, improves and increases the biodegradability of the raw water, and is conducive to further degradation in subsequent treatment. At the same time, the suspended matter in the wastewater is removed to prevent impact on subsequent treatment units. The hydrolysis acidification tank uses a pulse water distributor 12 for water distribution. The water distributor 12 is purified by the MBR integrated equipment 13.

[0026] The effluent from the acidification tank enters the aerobic tank, where aerobic bacteria are used to adsorb, oxidize and decompose organic matter in the sewage. The aerobic tank is divided into two sections, and a two-stage contact oxidation process is used to ensure that the wastewater meets the standards. The contact oxidation tank is the core part of this process flow, where most of the organic pollutants in the wastewater are completely decomposed, thereby ensuring that the wastewater can meet the discharge standards.

[0027] The effluent from the aerobic tank enters the MBR tank, which uses membrane separation equipment to intercept the activated sludge and macromolecular organic matter in the biochemical reaction tank, eliminating the need for a secondary sedimentation tank. The membrane-bioreactor process greatly enhances the function of the bioreactor through membrane separation technology, greatly increasing the concentration of activated sludge. The MBR tank must be backwashed.

[0028] The effluent from the MBR tank can meet the discharge standards after entering the clean water tank, and the water from the clean water tank is used to backwash the membrane.

[0029] Sludge treatment

[0030] Wastewater treatment facilities convert pollutants such as SS, COD, BOD, and petroleum in wastewater into sludge. Sludge has a high moisture content, high organic matter content, is unstable, and easily corrupted. It also contains pathogenic bacteria and parasite eggs. Therefore, sludge must be treated and disposed of to avoid secondary pollution.

[0031] The sludge generated by the project is divided into physical and chemical sludge and biochemical sludge. Both are first discharged into the sludge concentration tank, where the sludge is concentrated by gravity to reduce the water content of the sludge. Then the sludge is pumped into the plate and frame filter press for dehydration. The dehydrated mud cake is transported out for disposal.

[0032] The sludge treatment system mainly includes: a sludge tank 14, a diaphragm pump 15 and a filter press 16.

[0033] The physical and chemical sludge and the remaining biochemical sludge are collected and put into the sludge pool 14, and then pumped into the filter press 16 for dehydration through the diaphragm pump 15. The mud cake produced is entrusted to a qualified unit for external transportation and disposal, and the filtrate is returned to the original regulating pool. Various waste liquids generated during the system treatment process, such as sludge filter press washing water, are collected and put into the original regulating pool for further treatment to prevent secondary pollution.

[0034] The process route adopted is physical and chemical pretreatment + biochemical treatment + deep treatment.

[0035] The core process of physicochemical pretreatment adopts the "coupling process of micro-electrolysis + Feton oxidation method". This process has the functions of oxidation-reduction, adsorption flocculation, catalytic oxidation and co-precipitation, which can achieve the breakage of macromolecular pollutants, thereby removing difficult-to-degrade organic pollutants and improving the biodegradability of wastewater. Micro-electrolysis method uses the electrochemical corrosion principle of metals to treat wastewater, and uses iron and carbon to form a primary battery to pretreat biologically difficult-to-degrade wastewater. In the micro-electrolysis + Feton oxidation system, a large amount of Fe2+ is produced during the micro-electrolysis of iron filings, which forms Feton reagents with additional hydrogen peroxide under acidic conditions. The strong oxidizing property (·OH) produced in the Feton reaction can achieve effective degradation of organic pollutants and greatly improve the biodegradability of wastewater. This combined process overcomes the shortcomings of low CODcr removal rate of iron-carbon micro-electrolysis method and high reagent cost of Feton oxidation method.

[0036] The biochemical treatment process is mainly anaerobic + two-stage aerobic, using contact oxidation technology, filling the pool with biological fillers, the sewage immerses all the fillers, and flows through the fillers at a certain flow rate. The fillers are covered with biofilms, and the sewage is in extensive contact with the biofilms. Under the action of the metabolic function of microorganisms on the biofilms, organic pollutants in the sewage are removed. Biological contact oxidation is a biological technology between the activated sludge method and the biological filter, which has the advantages of both, has a strong adaptability to shock loads, and can still maintain good treatment effects under intermittent operation conditions.

[0037] The MBR process is used for deep treatment. The membrane-bioreactor (MBR) is a new type of efficient sewage treatment and reuse process that organically combines membrane separation technology with traditional sewage biological treatment technology. It has the characteristics of good effluent quality and small footprint. This technology greatly improves the mud-water separation efficiency through the efficient separation effect of the membrane component, and increases the biochemical reaction rate due to the increase in the concentration of activated sludge in the aeration tank and the emergence of dominant bacteria in the sludge. At the same time, this process can greatly reduce the output of residual sludge, thus basically solving the outstanding problems of traditional biological methods such as large residual sludge output, large footprint, and low operating efficiency. In the membrane bioreactor, the membrane assembly composed of hollow fiber membranes is immersed in the aerobic aeration zone. Since the pore size of the hollow fiber membrane can completely prevent the passage of bacteria, all bacterial flocs and free bacteria are retained in the aeration tank, and only the filtered water is discharged into the water collection pipe, thereby achieving mud and water separation. Various suspended particles, bacteria, algae, turbidity, COD and organic matter are effectively removed, ensuring the water quality of the effluent.

[0038] In addition, the project control system adopts PLC control, with a high degree of automation.

[0039] In this embodiment, the dosing device 17 includes a NAOH dosing device 171, a FeSO 4 The dosing device 172, the PAC dosing device 173 and the PAM dosing device 174; the NAOH dosing device 171 is connected to a settling tank 5 and a neutralization tank 22 respectively, and the FeSO 4 The dosing device 172 is connected to the first settling tank 5 and the Fenton tank 7 respectively, the PAC dosing device 173 is connected to the first settling tank 5 and the second settling tank 9 respectively, and the PAM dosing device 174 is connected to the first settling tank 5 and the second settling tank 9 respectively.

[0040] In this embodiment, a backwash pump 13 is further included, and the outlet of the MBR integrated equipment 13 is connected to the inlet of the MBR integrated equipment 13 through the backwash pump 13 .

[0041] In the present embodiment, it also includes a fan group, which is connected to the regulating tank 2, the internal electrolytic tank 6, the neutralization tank 22, the degassing tank 8, the intermediate tank 10 and the MBR integrated equipment 13 respectively.

[0042] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For ordinary technicians in this field, various changes, modifications, substitutions and deformations of these embodiments without departing from the principle and purpose of the present invention still fall within the scope of protection of the present invention.

Claims

1. A barrel washing wastewater treatment system, characterized in that It includes a grease trap (1), a regulating tank (2), a primary pump (3), an air flotation machine (4), a primary sedimentation tank (5), an internal electrolytic cell (6), a Fenton tank (7), a degassing tank (8), a secondary sedimentation tank (9), an intermediate tank (10), a secondary pump (11), a water distributor (12), an MBR integrated equipment (13), a sludge tank (14), a diaphragm pump (15), a filter press (16) and a dosing device (17); The inlet of the grease trap (1) is connected to external barrel washing wastewater, the outlet of the grease trap (1) is connected to the regulating tank (2), the regulating tank (2) is connected to the air flotation machine (4) through the primary pump (3), the air flotation machine (4) is connected to a first sedimentation tank (5), the first sedimentation tank (5) is connected to an inner electrolytic tank (6), the inner electrolytic tank (6) is connected to a Fenton tank (7), the Fenton tank (7) is connected to a degassing tank (8), the degassing tank (8) is connected to a second sedimentation tank (9), the second sedimentation tank (9) is connected to an intermediate tank (10), the intermediate tank (10) is connected to a water distributor (12) through a secondary pump (11), the water distributor (12) is connected to an MBR integrated device (13), and the MBR integrated device (13) is connected to the outside; The sludge tank (14) is connected to the first sedimentation tank (5) and the second sedimentation tank (9) respectively. The sludge tank (14) is connected to the filter press (16) through a diaphragm pump (15). The filter press (16) is connected to the outside and the regulating tank (2) respectively. The dosing device (17) is connected to the first sedimentation tank (5), the internal electrolytic cell (6), the Fenton tank (7), the second sedimentation tank (9) and the Fenton tank (7) respectively.

2. The barrel washing wastewater treatment system according to claim 1 is characterized in that The dosing device (17) comprises a NAOH dosing device (171), a FeSO4 dosing device (172), a PAC dosing device (173), a PAM dosing device (174), an acid dosing device (175) and a hydrogen peroxide device (176); the NAOH dosing device (171) is respectively connected to a first sedimentation tank (5) and a Fenton tank (7); the FeSO4 dosing device (172) is respectively connected to a first sedimentation tank (5) and a Fenton tank (7); the PAC dosing device (173) is respectively connected to a first sedimentation tank (5) and a second sedimentation tank (9); the PAM dosing device (174) is respectively connected to a first sedimentation tank (5) and a second sedimentation tank (9); the acid dosing device (175) is respectively connected to an internal electrolytic cell (6); and the hydrogen peroxide device (176) is connected to a Fenton tank (7).

3. The barrel washing wastewater treatment system according to claim 1 is characterized in that The MBR integrated equipment (13) comprises an acidification tank (131), an aerobic tank (132), an MBR tank (133), a tertiary pump (134), a clear water tank (135) and a backwash pump (136); the acidification tank (131) is connected to the water distributor (12), the aerobic tank (132) is connected to the acidification tank (131), the MBR tank (133) is connected to the clear water tank (135) via the tertiary pump (134), the clear water tank (135) is connected to the outside, and the clear water tank (135) is connected to the MRR tank (133) via the backwash pump (136).

4. The barrel washing wastewater treatment system according to claim 1, characterized in that It also includes a fan unit, which is respectively connected to the regulating tank (2), the internal electrolytic tank (6), the Fenton tank (7), the degassing tank (8), the intermediate tank (10) and the MBR integrated equipment (13).

5. The barrel washing wastewater treatment system according to claim 1, characterized in that It also includes an oil recovery machine (18), wherein the oil recovery machine (18) is arranged on the oil separator (1).

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