Oily sewage biochemical treatment device

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to an oily sewage biochemical treatment device. Comprising a hydrolytic acidification reactor, an anoxic tank, an aerobic tank, an MSBR tank, a contact oxidation tank, a secondary sedimentation tank and a drainage monitoring tank which are sequentially connected in series through a fluid conveying pipeline, a sludge discharge port is formed in the bottom of the contact oxidation tank and is connected with a sludge inlet of the sludge nitrification tank through a sludge discharge pipeline; a supernatant overflow port is formed in the top of the sludge nitrification tank and is connected with a water inlet of the anoxic tank through a reflux pipeline; and the bottom of the sludge nitrification tank is provided with a slag discharge port which is connected with the slag inlet of the sludge tank through a slag discharge pipeline. According to the device, the efficient and stable treatment of the oily sewage is realized by optimizing the biochemical treatment flow and enhancing the sludge treatment effect, and the backflow retreatment is automatically performed when the effluent quality does not reach the standard, so that the effluent quality is ensured to meet the discharge standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a biochemical treatment device for oily sewage. Background Art

[0002] With the acceleration of industrialization, the treatment of oily wastewater has become an important issue in the field of environmental protection. Especially in the oil processing industry such as lubricating oil base oil hydrogenation unit, a large amount of oily wastewater is generated during the production process. Its composition is complex, containing high concentrations of oil, suspended solids, chemical oxygen demand (COD), ammonia nitrogen and other pollutants. Direct discharge will cause serious pollution to the environment.

[0003] Traditional oily wastewater treatment processes often have problems such as low treatment efficiency, high operating costs, and difficult-to-reach effluent quality. Especially in the biochemical treatment stage, the high content of refractory organic matter and poor biodegradability in oily wastewater lead to poor biochemical treatment results. In addition, traditional sludge treatment methods also often have problems such as high energy consumption and incomplete treatment.

[0004] Therefore, it is particularly important to develop an efficient and stable oily wastewater treatment technology. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a biochemical treatment device for oily wastewater, which achieves efficient and stable treatment of oily wastewater by optimizing the biochemical treatment process and enhancing the sludge treatment effect.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] The biochemical treatment device for oily wastewater comprises a hydrolysis acidification reactor, an anoxic tank, an aerobic tank, an MSBR tank, a contact oxidation tank, a secondary sedimentation tank and a drainage monitoring tank which are sequentially connected in series through a fluid conveying pipeline; a sludge discharge port is provided at the bottom of the contact oxidation tank, which is connected to the sludge inlet of the sludge nitrification tank through a sludge discharge pipeline; a supernatant overflow port is provided at the top of the sludge nitrification tank, which is connected to the water inlet of the anoxic tank through a reflux pipeline; a slag discharge port is provided at the bottom of the sludge nitrification tank, which is connected to the slag inlet of the sludge slag tank through a slag discharge pipeline.

[0008] The front end of the hydrolysis acidification reactor is provided with an oil-water separator, the overflow port of the oil-water separator is connected to the water inlet of the hydrolysis acidification reactor through a pipeline, and the underflow port is connected to the mud inlet of the sludge nitrification tank through an oily sludge pump.

[0009] The outlet of the drainage monitoring pool is connected to the water inlet of the external open channel and the reflux water inlet of the hydrolysis acidification reactor respectively through a diversion pipeline.

[0010] The described oil-containing sewage biochemical treatment device further includes a multi-stage centrifugal fan. The main air outlet pipe of the multi-stage centrifugal fan is connected to the anoxic tank, aerobic tank, MSBR tank, and contact oxidation tank respectively through aeration branch pipes.

[0011] The bottom of the secondary sedimentation tank is connected to the slag inlet of the sludge tank through a sludge discharge branch pipe.

[0012] A sludge deep treatment unit is connected downstream of the sludge tank. The sludge deep treatment unit includes a plate and frame filter press and a drying and incineration furnace connected in series in sequence. The filtrate outlet of the plate and frame filter press returns to the hydrolysis acidification reactor through a pipeline, and the flue gas outlet of the drying and incineration furnace is connected to the waste gas treatment system.

[0013] The working principle of the described oil-containing sewage biochemical treatment device is as follows:

[0014] The oil-containing sewage first enters the oil-water separator, and most of the floating oil and suspended solids in the sewage are removed by physical methods to improve the efficiency of subsequent biochemical treatment. The overflow port of the oil-water separator sends the pretreated sewage into the hydrolysis acidification reactor, while the underflow port sends the oil-containing sludge into the sludge nitrification tank through an oil-containing sludge pump for further treatment.

[0015] The pretreated sewage enters the hydrolysis acidification reactor. Under anaerobic or facultative conditions, through the action of hydrolytic bacteria and acid-producing bacteria, macromolecular and refractory organic matters are degraded into small-molecular organic matters, improving the biodegradability of the sewage.

[0016] Subsequently, the sewage successively enters the anoxic tank, aerobic tank, MSBR tank, and contact oxidation tank. Through the synergistic action of different microorganisms, the further degradation of organic matters and the removal of nutrients such as nitrogen and phosphorus are realized. In the anoxic tank, facultative denitrifying bacteria reduce nitrite nitrogen and nitrate nitrogen into nitrogen gas and discharge it to achieve the purpose of denitrification. In the aerobic tank, heterotrophic ammonifying bacteria decompose nitrogen-containing organic matters into ammonia, and then autotrophic nitrite bacteria and nitrate bacteria further oxidize it into nitrite nitrogen and nitrate nitrogen. The MSBR tank combines the advantages of the traditional activated sludge method and SBR technology, and realizes continuous water inlet and intermittent water discharge through the single-tank multi-compartment method, improving the treatment efficiency and water quality stability. The contact oxidation tank uses the biofilm growing on the fillers submerged in the sewage to further adsorb and oxidize and decompose the organic matters in the sewage.

[0017] The sludge generated during the biochemical treatment process is discharged into the sludge nitrification tank through the sludge discharge port, where nitrification reaction occurs to further degrade the organic matter in the sludge. The supernatant of the sludge nitrification tank returns to the anoxic tank through the reflux pipeline, realizing sludge reflux and recycling of nutrient elements. The treated sludge is discharged into the sludge residue tank through the slag discharge port at the bottom of the sludge nitrification tank, and then further treated through the sludge deep treatment unit (including plate and frame filter press and drying incinerator). After the sludge is dehydrated by the plate and frame filter press, the filtrate returns to the hydrolysis acidification reactor, and the drying incinerator dries and incinerates the dehydrated sludge, and the flue gas is discharged up to the standard through the waste gas treatment system.

[0018] The multi-stage centrifugal fan provides sufficient oxygen supply for the biochemical treatment stage, and aerates the anoxic tank, aerobic tank, MSBR tank and contact oxidation tank respectively through the aeration branch pipes to promote the growth and metabolic activities of microorganisms.

[0019] The drainage monitoring tank is used to monitor the effluent quality in real time. When the water quality monitoring result shows that the effluent quality is unqualified, the outlet of the drainage monitoring tank guides the sewage to the reflux inlet of the hydrolysis acidification reactor through the diversion pipeline to realize the reflux and re-treatment of the sewage until the water quality reaches the standard. This process is realized through the automatic control system to ensure the stable effluent quality up to the standard. When the water quality monitoring result shows that the effluent quality is qualified, the outlet of the drainage monitoring tank guides the sewage to the inlet trough of the open channel for external discharge through the diversion pipeline. At the same time, the system records and stores the water quality monitoring data for subsequent analysis and optimization of the treatment process.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] (1) The oil-containing sewage biochemical treatment device described in the present utility model can effectively degrade the macromolecular and refractory organic matter in the oil-containing sewage and efficiently remove nutrient elements such as nitrogen and phosphorus by integrating various biochemical treatment technologies such as hydrolysis acidification, anoxic, aerobic, MSBR and contact oxidation. At the same time, the application of the multi-stage centrifugal fan ensures sufficient oxygen supply during the biochemical treatment process, promotes the activity and metabolism of microorganisms, and further improves the treatment efficiency. The overall treatment process is reasonably designed and operates stably, and can meet the strict environmental protection discharge standards;

[0022] (2) The drainage monitoring tank and diversion pipeline system built in the oil-containing sewage biochemical treatment device described in the present utility model realize the real-time monitoring and intelligent regulation of the effluent quality. When the water quality does not meet the standard, the sewage is automatically guided back to the hydrolysis acidification reactor for re-treatment until the water quality reaches the standard before discharge. This mechanism effectively ensures the continuous stability of the effluent quality and reduces the environmental protection risks caused by water quality fluctuations;

[0023] (3) For the sludge generated during the biochemical treatment process, this device adopts a combination of treatment technologies such as sludge nitrification, plate and frame filter pressing, and drying and incineration to achieve resource utilization and harmless treatment of sludge. The organic matter in the sludge is further degraded during the nitrification process, and the filtrate after filter pressing and dehydration is returned to the hydrolysis and acidification reactor for reuse, while the dehydrated sludge is converted into harmless ash through drying and incineration, and the flue gas is discharged in compliance with the standards through the waste gas treatment system. The entire sludge treatment process is efficient and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the biochemical treatment device for oily wastewater according to the utility model;

[0025] In the figure: 1. Hydrolysis acidification reactor; 2. Anoxic tank; 3. Aerobic tank; 4. MSBR tank; 5. Contact oxidation tank; 6. Secondary sedimentation tank; 7. Drainage monitoring tank; 8. Sludge nitrification tank; 9. Sludge tank; 10. Oil-water separator; 11. Oily sludge pump; 12. External open channel; 13. Multi-stage centrifugal fan; 14. Plate and frame filter press; 15. Drying incinerator; 16. Waste gas treatment system. DETAILED DESCRIPTION

[0026] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, the biochemical treatment device for oily wastewater comprises a hydrolysis acidification reactor 1, an anoxic tank 2, an aerobic tank 3, an MSBR tank 4, a contact oxidation tank 5, a secondary sedimentation tank 6 and a drainage monitoring tank 7 which are sequentially connected in series through a fluid conveying pipeline; a sludge discharge port is provided at the bottom of the contact oxidation tank 5, which is connected to the sludge inlet of the sludge nitrification tank 8 through a sludge discharge pipeline; a supernatant overflow port is provided at the top of the sludge nitrification tank 8, which is connected to the water inlet of the anoxic tank 2 through a reflux pipeline; a slag discharge port is provided at the bottom of the sludge nitrification tank 8, which is connected to the slag inlet of the sludge slag tank 9 through a slag discharge pipeline.

[0029] The front end of the hydrolysis acidification reactor 1 is provided with an oil-water separator 10, the overflow port of the oil-water separator 10 is connected to the water inlet of the hydrolysis acidification reactor 1 through a pipeline, and the underflow port is connected to the mud inlet of the sludge nitrification tank 8 through an oily sludge pump 11.

[0030] The outlet of the drainage monitoring pool 7 is connected to the water inlet of the external discharge open channel 12 and the reflux water inlet of the hydrolysis acidification reactor 1 through a diversion pipeline.

[0031] The described oily sewage biochemical treatment device further includes a multi-stage centrifugal fan 13. The air outlet main pipe of the multi-stage centrifugal fan 13 is respectively connected to the anoxic tank 2, aerobic tank 3, MSBR tank 4 and contact oxidation tank 5 through aeration branch pipes.

[0032] The bottom of the secondary sedimentation tank 6 is connected to the slag inlet of the sludge tank 9 through a sludge discharge branch pipe.

[0033] A sludge deep treatment unit is connected downstream of the sludge tank 9. The sludge deep treatment unit includes a plate and frame filter press 14 and a drying and incineration furnace 15 connected in series in sequence; the filtrate outlet of the plate and frame filter press 14 returns to the hydrolysis acidification reactor 1 through a pipeline, and the flue gas outlet of the drying and incineration furnace 15 is connected to the waste gas treatment system 16.

[0034] During operation, the specific process is as follows:

[0035] The oily sewage first enters the oil-water separator 10, and most of the floating oil and suspended solids are removed through physical methods. The pretreated sewage then enters the hydrolysis acidification reactor 1. Under anaerobic or facultative conditions, hydrolytic bacteria and acid-producing bacteria degrade the macromolecular and refractory organic substances in the sewage into small molecular organic substances, improving the biodegradability of the sewage.

[0036] Next, the sewage flows through the anoxic tank 2, aerobic tank 3, MSBR tank 4 and contact oxidation tank 5 in sequence, and through the synergistic action of different microorganisms, the further degradation of organic substances and the removal of nutrients such as nitrogen and phosphorus are achieved. At the same time, the multi-stage centrifugal fan 13 provides sufficient oxygen supply for each biochemical treatment unit, promoting the growth and metabolism of microorganisms.

[0037] The sludge generated during the biochemical treatment process enters the sludge nitrification tank 8 through the sludge discharge pipeline for nitrification reaction to further degrade the organic substances in the sludge. The supernatant after nitrification is refluxed to the anoxic tank 2 for recycling, while the sludge at the bottom is discharged into the sludge tank 9 for subsequent treatment. In the sludge tank 9, after the sludge is dehydrated by the plate and frame filter press 14, the filtrate returns to the hydrolysis acidification reactor 1, and the dehydrated sludge is sent to the drying and incineration furnace 15 for harmless treatment, and the flue gas is discharged up to standard through the waste gas treatment system 16.

[0038] Finally, the treated sewage enters the drainage monitoring tank 7 for water quality monitoring. If the water quality meets the standard, it is discharged to the external drainage open channel 12 through the diversion pipeline; if the water quality does not meet the standard, the sewage is automatically guided back to the hydrolysis acidification reactor 1 for re-treatment until the water quality meets the standard. The entire treatment process realizes automatic control and intelligent regulation, ensuring the continuous stability of the effluent water quality and environmental protection compliance.

Claims

1. A biochemical treatment device for oily wastewater, characterized in that: The invention comprises a hydrolysis acidification reactor (1), an anoxic tank (2), an aerobic tank (3), an MSBR tank (4), a contact oxidation tank (5), a secondary sedimentation tank (6) and a drainage monitoring tank (7) which are sequentially connected in series via a fluid conveying pipeline; a sludge discharge port is provided at the bottom of the contact oxidation tank (5), which is connected to the sludge inlet of a sludge nitrification tank (8) via a sludge discharge pipeline; a supernatant overflow port is provided at the top of the sludge nitrification tank (8), which is connected to the water inlet of the anoxic tank (2) via a reflux pipeline; a slag discharge port is provided at the bottom of the sludge nitrification tank (8), which is connected to the slag inlet of a sludge slag tank (9) via a slag discharge pipeline.

2. The biochemical treatment device for oily wastewater according to claim 1 is characterized in that: An oil-water separator (10) is provided at the front end of the hydrolysis acidification reactor (1); the overflow port of the oil-water separator (10) is connected to the water inlet of the hydrolysis acidification reactor (1) via a pipeline, and the underflow port is connected to the mud inlet of the sludge nitrification tank (8) via an oily sludge pump (11).

3. The biochemical treatment device for oily wastewater according to claim 1 is characterized in that: The outlet of the drainage monitoring pool (7) is connected to the water inlet of the external drainage open channel (12) and the reflux water inlet of the hydrolysis acidification reactor (1) respectively through a diversion pipe.

4. The biochemical treatment device for oily wastewater according to claim 1 is characterized in that: It also includes a multi-stage centrifugal fan (13), the main air outlet pipe of the multi-stage centrifugal fan (13) is connected to the anoxic tank (2), the aerobic tank (3), the MSBR tank (4) and the contact oxidation tank (5) respectively through aeration branch pipes.

5. The biochemical treatment device for oily wastewater according to claim 1 is characterized in that: The bottom of the secondary sedimentation tank (6) is connected to the slag inlet of the sludge tank (9) via a sludge discharge branch pipe.

6. The biochemical treatment device for oily wastewater according to claim 1 is characterized in that: A sludge deep treatment unit is connected downstream of the sludge pool (9), and the sludge deep treatment unit comprises a plate and frame filter press (14) and a drying incinerator (15) which are sequentially connected in series; the filtrate outlet of the plate and frame filter press (14) is returned to the hydrolysis acidification reactor (1) through a pipeline, and the flue gas outlet of the drying incinerator (15) is connected to the waste gas treatment system (16).

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