CN112062419A - Chemical raw material tank washing station tank washing wastewater treatment system and wastewater treatment process - Google Patents
Chemical raw material tank washing station tank washing wastewater treatment system and wastewater treatment process Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
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Abstract
The invention provides a chemical raw material tank washing station tank washing wastewater treatment system and a wastewater treatment process. The front end of the invention adopts the split collection and pretreatment process, so the wide applicability of the whole process route is ensured, the rear end adopts the mixed treatment route, so the economy of the treatment process is ensured, compared with the process flow adopting the split treatment process flow in the whole process, the investment cost and the operation cost of the process route of the invention are greatly reduced, and compared with the process flow without the split collection and pretreatment process flow arranged at the front end, the application range of the process route of the invention is wider.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a chemical raw material tank washing station tank washing wastewater treatment system and a wastewater treatment process.
Background
The tank washing wastewater is wastewater generated in the process of washing bulk cargo ships at a tank washing station, and is required to be subjected to tank washing operation after unloading according to regulations in order to ensure the quality of goods, prevent cross contamination between the goods or prevent the safety of the ships caused by dangerous reaction between the residues of the goods in the last voyage and the goods at this time, and the wastewater generated in the cleaning process is the tank washing wastewater.
The types of toxic liquid chemicals in bulk transported in China reach dozens of types, so that the cabin washing wastewater not only contains chemical substances which are difficult to biologically treat, but also has variability and randomness in the amount and concentration of the wastewater, and is a type of wastewater with higher treatment difficulty. Its main pollution characteristics are as follows:
(1) the cargo ships in the tank washing station transport various chemicals, so that the water quality and the components of the sewage are complex;
(2) the pollutant concentration is high, and a large proportion of organic pollutants which are difficult to degrade is contained;
(3) the property of the waste water is related to the tank washing process and the residual liquid, and the tank washing station adopts intermittent operation, so that the water quality has great randomness and stirring property.
At present, some treatment processes aiming at the cabin washing wastewater exist in the market, but most of the processes only relate to pretreatment, and the cabin washing wastewater is not thoroughly treated to the discharge standard. In addition, some full-flow treatment processes are proposed, but the industrial application range is narrow, the full-flow treatment processes are only suitable for some tank washing stations for loading and unloading specific types of chemicals, the impact resistance is poor, and the popularization is difficult. Therefore, aiming at the characteristics of the current cabin washing water, the development of a treatment process which has strong impact resistance, wide application range, economy and high efficiency has important significance, and simultaneously, the treatment process also conforms to the current social development trend.
Disclosure of Invention
The invention aims to provide a chemical raw material tank washing station tank washing wastewater treatment system and a wastewater treatment process, which have the advantages of strong impact resistance, wide application range, economy and high efficiency.
In order to solve the above technical problems, an embodiment of the present invention provides a system for treating wastewater from washing a chemical material tank washing station, comprising a separate collection unit, an anaerobic biochemical unit, an air flotation unit, a steam stripping unit, a mixed conditioning unit, a hydrolysis acidification unit, a primary aerobic biochemical unit, a secondary advanced oxidation unit, and a secondary aerobic biochemical unit,
the split-type collecting unit comprises a first-type wastewater adjusting tank, a second-type wastewater adjusting tank, a third-type wastewater adjusting tank and a fourth-type wastewater adjusting tank, wherein cabin-washing wastewater containing pollutants which are soluble in water and have good biodegradability is stored in the first-type wastewater adjusting tank, cabin-washing wastewater containing pollutants which are insoluble in water and have poor biodegradability is stored in the second-type wastewater adjusting tank, cabin-washing wastewater containing pollutants which are soluble in water and have high boiling points and biological inhibition effects is stored in the third-type wastewater adjusting tank, and cabin-washing wastewater containing pollutants which are soluble in water, have low boiling points and have poor biodegradability is stored in the fourth-type wastewater adjusting tank;
the water outlet of the first-class wastewater adjusting tank is connected with the water inlet of the anaerobic biochemical unit, the water outlet of the second-class wastewater adjusting tank is connected with the water inlet of the air flotation unit, the water outlet of the fourth-class wastewater adjusting tank is connected with the water inlet of the steam stripping unit, the water outlets of the third-class wastewater adjusting tank, the anaerobic biochemical unit, the air flotation unit and the steam stripping unit are all connected with the water inlet of the mixed conditioning unit, the water outlet of the mixed conditioning unit is sequentially connected with a hydrolysis acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit, and the water outlet of the second-stage aerobic biochemical unit is connected with a municipal drainage pipe network;
the anaerobic biochemical unit is provided with a trace element adding pipe, a sodium hydroxide adding pipe and an anaerobic biological promoter adding pipe;
and an N/P nutrient solution supplementing pipe is arranged on the mixing and tempering unit.
And a first-stage advanced oxidation unit is arranged between the third type wastewater adjusting tank and the mixing and tempering unit.
The primary advanced oxidation unit is one of an electro-Fenton oxidation tank, an electrolytic oxidation tank and an ozone catalytic oxidation tank, and the electro-Fenton oxidation tank is preferred.
And the water outlets of the third type wastewater adjusting tank and the first type wastewater adjusting tank are respectively connected with the water inlet of the anaerobic biochemical unit through a pipeline and a lifting pump.
The anaerobic biochemical unit comprises an EGSB (expanded granular sludge bed) tempering tank, a water outlet of the first type of wastewater tempering tank is connected with a water inlet of the EGSB tempering tank, a water outlet of the EGSB tempering tank is connected with a water inlet of an EGSB anaerobic reactor, and the trace element adding pipe, the sodium hydroxide adding pipe and the anaerobic biological promoter adding pipe are distributed and connected with the EGSB tempering tank;
a heat exchanger is arranged on a pipeline between the first type wastewater adjusting tank and the EGSB tempering tank;
a circulating pipe is communicated between the bottom and the upper part of one side of the EGSB tempering tank, and a feeding pump of an injection mixer is arranged on the circulating pipe;
and a sludge inlet of the EGSB anaerobic reactor is connected with an anaerobic sludge storage tank.
The system comprises a first wastewater adjusting tank, a second wastewater adjusting tank, an oil separation tank, a first sludge treatment unit, a second sludge treatment unit, a sludge treatment system and a sewage treatment system, wherein the air flotation unit comprises an air flotation tank, a water outlet of the second wastewater adjusting tank is sequentially connected with the oil separation tank and the air flotation tank, a lifting pump is arranged on a pipeline connecting the second wastewater adjusting tank and the oil separation tank, sludge outlets of the oil separation tank and the air flotation tank are connected with a sludge inlet of the sludge treatment unit, and a sludge outlet of the sludge;
and the air floatation tank is connected with a PAC adding pipe and a PAM adding pipe.
Preferably, the air flotation tank adopts a multi-stage dissolved air flotation tank.
The steam stripping unit comprises a steam stripping tower, wherein a multi-stage packing bed layer is arranged in the steam stripping tower, the bottom of the steam stripping tower is connected with an external steam supply device, and a water outlet of the fourth type wastewater adjusting tank is connected with a water inlet of the steam stripping tower;
a lifting pump and a heat exchanger are arranged on a pipeline between the fourth type wastewater adjusting tank and the stripping tower, a water circulating pipe is communicated between the bottom and the upper part of one side of the stripping tower, and a circulating pump is arranged on the water circulating pipe.
The mixing and tempering unit comprises a middle mixing tank and a stirrer, and the stirrer is arranged in the middle mixing tank;
the hydrolysis acidification unit comprises a hydrolysis acidification pool, and a water outlet of the middle mixing tank is connected with a water inlet of the hydrolysis acidification pool;
the primary aerobic biochemical unit comprises an MBBR tank and an MBR tank, the water outlet of the hydrolysis acidification tank is connected with the water inlet of the MBBR tank, the water outlet of the MBBR tank is connected with the water inlet of the MBR tank, and the bottoms of the MBBR tank and the MBR tank are connected with an external aeration fan;
and the sludge outlets of the hydrolysis acidification tank and the MBR tank are connected with a sludge storage tank.
Preferably, the secondary advanced oxidation unit is one of an electro-fenton oxidation tank, an electrolytic oxidation tank and an ozone catalytic oxidation tower;
the secondary aerobic biochemical unit is one or a combination of an MBBR tank, an MBR tank and an ultra-clean biological fluidized bed.
The invention also provides a wastewater treatment process utilizing the chemical raw material tank washing station tank washing wastewater treatment system, which comprises the following steps:
(1) separately collecting and storing the cabin washing wastewater: conveying different materials of cabin washing wastewater to a pretreatment station through a pipeline, allowing the different materials of cabin washing wastewater to enter a separate adjusting tank for storage, wherein the cabin washing wastewater which is easy to dissolve in water and has better biodegradability enters a first type wastewater adjusting tank for storage, the wastewater which contains pollutants which are difficult to dissolve in water and have poor biodegradability enters a second type wastewater adjusting tank, the cabin washing water which contains pollutants which are easy to dissolve in water and have higher boiling points and biological inhibition enters a third type wastewater adjusting tank, and the cabin washing water which contains pollutants which are easy to dissolve in water, have lower boiling points and have poor biodegradability enters a fourth type wastewater adjusting tank;
(2) wastewater pretreatment: the wastewater of the first type wastewater adjusting tank enters an anaerobic biochemical unit for medium-temperature anaerobic treatment, the wastewater of the second type wastewater adjusting tank enters an air flotation unit for multi-stage dissolved air flotation treatment, the wastewater of the third type wastewater adjusting tank enters a first-stage advanced oxidation treatment unit for oxidation treatment, and the wastewater of the fourth type wastewater adjusting tank enters a stripping unit for ether substance vaporization treatment;
(3) comprehensive treatment of wastewater: the various types of wastewater treated in the step (2) flow into a mixing and tempering unit, are fully mixed in the mixing and tempering unit, and after the water quality is homogenized and equalized, the wastewater enters a hydrolysis acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit in sequence through lifting or self-flowing by a pump;
(4) and the effluent of the secondary biochemical unit is directly discharged or connected to a municipal pipe network.
In the step (2), the treatment process of the first type of wastewater in the first type of wastewater adjusting tank entering the anaerobic biochemical unit is as follows: feeding the first type of wastewater into an EGSB (expanded granular sludge bed) tempering tank through a lifting pump, adding various nutrient elements into the EGSB tempering tank to enable the first type of wastewater to reach an anaerobic optimal pH range, and simultaneously supplementing nutrient salts necessary for anaerobic microorganisms; the effluent of the tempering tank enters an EGSB anaerobic reactor at a stable flow rate, meanwhile, part of the effluent after anaerobic treatment is circulated to the EGSB tempering tank to facilitate alkalinity, and other effluent after anaerobic treatment automatically flows to a middle mixing tank of the mixing tempering unit under the action of gravity;
the treatment process for the second type wastewater in the second type wastewater adjusting tank to enter the air floatation unit comprises the following steps: lifting the second type wastewater to an air floatation tank through a lifting pump, carrying oil sludge to the water surface through two-stage dissolved air water generated by air floatation and removing, enabling air floatation effluent to automatically flow into a middle mixing tank of the mixing tempering unit, and enabling oil sludge generated by air floatation to enter an oil sludge storage tank;
the treatment process of the third type wastewater in the third type wastewater adjusting tank entering the first-stage advanced oxidation treatment unit comprises the following steps: lifting the third wastewater into an electro-Fenton oxidation tank of a first-stage advanced oxidation treatment unit through a lifting pump, degrading macromolecules, toxic and harmful substances in the wastewater by adopting the strong oxidizing property of hydroxyl radicals, and improving the biodegradability of the wastewater, wherein the effluent of the electro-Fenton oxidation tank automatically flows into a middle mixing tank of a mixing and tempering unit;
the treatment process of the fourth type wastewater in the fourth type wastewater adjusting tank entering the stripping unit comprises the following steps: carry fourth type waste water to stripper front end heat exchanger through the pump, go out the heat exchange with the stripper and handle the back and go out water, preheat the incoming water, waste water gets into the stripper afterwards, through top of the tower water distribution system with waste water evenly distributed in the stripper, steam gets into by the tower bottom of stripper, the inside two-stage bed of packing that establishes of stripper, the gas-liquid is two-phase fully contacts in the bed of packing, the ether class material shifts to in the waste water in the gas phase, the stripper goes out water and gets into the intermediate mixing tank who mixes the quenching and tempering unit.
The technical scheme of the invention has the following beneficial effects: the invention provides a novel cabin washing wastewater combined treatment process with wide application range and strong impact resistance, wherein the front end adopts a separate collection and pretreatment process to ensure the wide applicability of the whole process route, the rear end adopts a mixed treatment route to ensure the economy of the treatment process, and compared with the process flow adopting separate treatment in the whole process, the investment cost and the operation cost of the process route are greatly reduced, and compared with the process flow without separate collection and pretreatment in the front end, the application range of the process route is wider.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the structure of FIG. 1 at the location of the collection unit;
FIG. 3 is an enlarged view of the mixing and tempering unit and subsequent steps in FIG. 1;
FIG. 4 is a process flow diagram of the present invention;
FIG. 5 is a process flow diagram of a first embodiment of the present invention;
FIG. 6 is a process flow diagram of a second embodiment of the present invention.
Description of reference numerals:
1. a separate collection unit; 2. an anaerobic biochemical unit; 3. an air flotation unit; 4. a stripping unit; 5. a mixing and tempering unit; 6. a hydrolysis acidification unit; 7. a primary aerobic biochemical unit; 8. a secondary advanced oxidation unit; 9. a secondary aerobic biochemical unit; 10. a primary advanced oxidation unit;
101. a separate collection unit; 102. an anaerobic biochemical unit; 103. an air flotation unit; 104. an electro-fenton oxidation unit; 105. a stripping unit; 106. a mixing and tempering unit; 107. a hydrolysis acidification unit; 108. a primary aerobic biochemical unit; 109. an ozone catalytic oxidation unit; 110. a biological ultra-clean fluidized bed unit; 111. a sludge treatment unit;
201. a separate collection unit; 202. an anaerobic biochemical unit; 203. an air flotation unit; 204. a stripping unit; 205. a mixing and tempering unit; 206. a hydrolysis acidification unit; 207. a primary aerobic biochemical unit; 208. an ozone catalytic oxidation unit; 209. a biological ultra-clean fluidized bed unit; 210. a sludge treatment unit.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in figures 1-3, the invention provides a system for treating wastewater from washing a chemical raw material tank in a tank washing station, which comprises a separate collection unit 1, an anaerobic biochemical unit 2, an air flotation unit 3, a stripping unit 4, a mixed conditioning unit 5, a hydrolytic acidification unit 6, a primary aerobic biochemical unit 7, a secondary advanced oxidation unit 8 and a secondary aerobic biochemical unit 9, wherein,
the split collecting unit 1 comprises a first type wastewater regulating tank, a second type wastewater regulating tank, a third type wastewater regulating tank and a fourth type wastewater regulating tank, wherein the first type wastewater regulating tank stores cabin washing wastewater containing easily soluble water and pollutants with good biodegradability such as alcohols and organic acids, the second type wastewater regulating tank stores cabin washing wastewater containing pollutants with poor biodegradability such as benzene and the like, the third type wastewater regulating tank stores cabin washing wastewater containing easily soluble water, high boiling point and pollutants with biological inhibition effect, and the fourth type wastewater regulating tank stores cabin washing wastewater containing pollutants with low solubility in water, low boiling point and poor biodegradability.
The four types of wastewater adjusting tanks are provided with COD, ammonia nitrogen, total nitrogen and other water quality online monitoring instruments and flow meters, so that water distribution of the system is facilitated. The four types of wastewater adjusting tanks are protected by nitrogen sealing, so that the safety of a storage tank system is improved; and further, the nitrogen-sealed tail gas of the four storage tanks is connected to a tail gas treatment system for treatment.
The water outlet of the first type wastewater adjusting tank is connected with the water inlet of the anaerobic biochemical unit 2, and the rear end of the anaerobic biochemical unit 2 is provided with a biogas collecting and processing system.
The delivery port of second type waste water regulating tank links to each other with the water inlet of air supporting unit 3, the delivery port of fourth type waste water regulating tank links to each other with the water inlet of strip unit 4, the delivery port of third type waste water regulating tank, anaerobism biochemical unit 2, air supporting unit 3 and strip unit 4 all links to each other with the water inlet of mixing quenching and tempering unit 5, the delivery port department that mixes quenching and tempering unit 5 has connected gradually hydrolytic acidification unit 6, the good oxygen biochemical unit 7 of one-level, the good high-grade oxidation unit 8 of second grade and the good oxygen biochemical unit 9 of second grade, the delivery port of the good oxygen biochemical unit 9 of second grade links to each other with municipal drainage pipe network.
And the anaerobic biochemical unit 2 is provided with a trace element adding pipe, a sodium hydroxide adding pipe and an anaerobic biological promoter adding pipe.
And an N/P nutrient solution supplementing pipe is arranged on the mixing and tempering unit 5.
A first-stage advanced oxidation unit 10 is arranged between the third type wastewater adjusting tank and the mixing and tempering unit 5.
The primary advanced oxidation unit is one of an electro-Fenton oxidation tank, an electrolytic oxidation tank and an ozone oxidation tank, the electro-Fenton oxidation tank is preferably selected, and the COD removal rate of the system is controlled to be 30-90%;
the anaerobic biochemical unit 2 comprises an EGSB (expanded granular sludge bed) tempering tank, the water outlet of the first type wastewater tempering tank is connected with the water inlet of the EGSB tempering tank, the water outlet of the EGSB tempering tank is connected with the water inlet of an EGSB anaerobic reactor, and the trace element adding pipe, the sodium hydroxide adding pipe and the anaerobic biological promoter adding pipe are distributed and connected with the EGSB tempering tank; a heat exchanger is arranged on a pipeline between the first type wastewater adjusting tank and the EGSB tempering tank; a circulating pipe is communicated between the bottom and the upper part of one side of the EGSB tempering tank, and a feeding pump of an injection mixer is arranged on the circulating pipe; and a sludge inlet of the EGSB anaerobic reactor is connected with an anaerobic sludge storage tank.
The air flotation unit 3 comprises a full-flow reinforced air flotation tank, a water outlet of the second type wastewater adjusting tank is sequentially connected with an oil separation tank and the air flotation tank, a lifting pump is arranged on a pipeline connecting the second type wastewater adjusting tank and the oil separation tank, oil sludge outlets of the oil separation tank and the air flotation tank are connected with a sludge inlet of the sludge treatment unit, and a sludge outlet of the sludge treatment unit is connected with a clean-first sludge treatment system; and the air floatation tank is connected with a PAC adding pipe and a PAM adding pipe. Preferably, the air flotation tank adopts a multi-stage dissolved air flotation tank.
The stripping unit 4 comprises a stripping tower, wherein a multi-stage packing bed layer is arranged in the stripping tower, and condensate is recycled or sent to a concentrated solution combustion system. The bottom of the stripping tower is connected with an external steam supply device, and a water outlet of the fourth type wastewater adjusting tank is connected with a water inlet of the stripping tower; a lifting pump and a heat exchanger are arranged on a pipeline between the fourth type wastewater adjusting tank and the stripping tower, a water circulating pipe is communicated between the bottom and the upper part of one side of the stripping tower, and a circulating pump is arranged on the water circulating pipe.
The mixing and tempering unit 5 comprises a middle mixing tank and a stirrer, and the stirrer is arranged in the middle mixing tank; the hydrolysis acidification unit 6 comprises a hydrolysis acidification pool, and a water outlet of the middle mixing tank is connected with a water inlet of the hydrolysis acidification pool; the primary aerobic biochemical unit 7 comprises an MBBR tank and an MBR tank, the water outlet of the hydrolysis acidification tank is connected with the water inlet of the MBBR tank, the water outlet of the MBBR tank is connected with the water inlet of the MBR tank, and the bottoms of the MBBR tank and the MBR tank are both connected with an external aeration fan; and the sludge outlets of the hydrolysis acidification tank and the MBR tank are connected with a sludge storage tank.
The secondary advanced oxidation unit 8 is one of an electro-Fenton oxidation tank, an electrolytic oxidation tank and an ozone catalytic oxidation tower, the electro-Fenton oxidation tank is preferably selected, and the COD removal rate is controlled to be 30-70%. The secondary aerobic biochemical unit 9 is one or a combination of an MBBR tank, an MBR tank and an ultra-clean biological fluidized bed.
As shown in fig. 4, the present invention further provides a wastewater treatment process using the tank-washing wastewater treatment system of the chemical raw material tank-washing station, comprising the following steps:
(1) separately collecting and storing the cabin washing wastewater: conveying different materials of cabin washing wastewater to a pretreatment station through a pipeline, allowing the different materials of cabin washing wastewater to enter a separate adjusting tank for storage, wherein the cabin washing wastewater which is easy to dissolve in water and has better biodegradability enters a first type wastewater adjusting tank for storage, the wastewater which contains pollutants which are difficult to dissolve in water and have poor biodegradability enters a second type wastewater adjusting tank, the cabin washing water which contains pollutants which are easy to dissolve in water and have higher boiling points and biological inhibition enters a third type wastewater adjusting tank, and the cabin washing water which contains pollutants which are easy to dissolve in water, have lower boiling points and have poor biodegradability enters a fourth type wastewater adjusting tank;
(2) wastewater pretreatment: the wastewater of the first type wastewater adjusting tank enters an anaerobic biochemical unit for medium-temperature anaerobic treatment, the wastewater of the second type wastewater adjusting tank enters an air flotation unit for multi-stage dissolved air flotation treatment, the wastewater of the third type wastewater adjusting tank enters a first-stage advanced oxidation treatment unit for oxidation treatment, and the wastewater of the fourth type wastewater adjusting tank enters a stripping unit for ether substance vaporization treatment;
wherein, the treatment process that the first type of waste water in the first type of waste water adjusting tank enters the anaerobic biochemical unit is as follows: feeding the first type of wastewater into an EGSB (expanded granular sludge bed) tempering tank through a lifting pump, adding various nutrient elements into the EGSB tempering tank to enable the first type of wastewater to reach an anaerobic optimal pH range, and simultaneously supplementing nutrient salts necessary for anaerobic microorganisms; the effluent of the tempering tank enters an EGSB anaerobic reactor at a stable flow rate, meanwhile, part of the effluent after anaerobic treatment is circulated to the EGSB tempering tank to facilitate alkalinity, and other effluent after anaerobic treatment automatically flows to a middle mixing tank of the mixing tempering unit under the action of gravity;
the treatment process for the second type wastewater in the second type wastewater adjusting tank to enter the air floatation unit comprises the following steps: lifting the second type wastewater to an air floatation tank through a lifting pump, carrying oil sludge to the water surface through two-stage dissolved air water generated by air floatation and removing, enabling air floatation effluent to automatically flow into a middle mixing tank of the mixing tempering unit, and enabling oil sludge generated by air floatation to enter an oil sludge storage tank;
the treatment process of the third type wastewater in the third type wastewater adjusting tank entering the first-stage advanced oxidation treatment unit comprises the following steps: lifting the third wastewater into an electro-Fenton oxidation tank of a first-stage advanced oxidation treatment unit through a lifting pump, degrading macromolecules, toxic and harmful substances in the wastewater by adopting the strong oxidizing property of hydroxyl radicals, and improving the biodegradability of the wastewater, wherein the effluent of the electro-Fenton oxidation tank automatically flows into a middle mixing tank of a mixing and tempering unit;
the treatment process of the fourth type wastewater in the fourth type wastewater adjusting tank entering the stripping unit comprises the following steps: carry fourth type waste water to stripper front end heat exchanger through the pump, go out the heat exchange with the stripper and handle the back and go out water, preheat the incoming water, waste water gets into the stripper afterwards, through top of the tower water distribution system with waste water evenly distributed in the stripper, steam gets into by the tower bottom of stripper, the inside two-stage bed of packing that establishes of stripper, the gas-liquid is two-phase fully contacts in the bed of packing, the ether class material shifts to in the waste water in the gas phase, the stripper goes out water and gets into the intermediate mixing tank who mixes the quenching and tempering unit.
(3) Comprehensive treatment of wastewater: the various types of wastewater treated in the step (2) flow into a mixing and tempering unit, are fully mixed in the mixing and tempering unit, and after the water quality is homogenized and equalized, the wastewater enters a hydrolysis acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit in sequence through lifting or self-flowing by a pump;
(4) and the effluent of the secondary biochemical unit is directly discharged or connected to a municipal pipe network.
The technical scheme of the invention is further illustrated by the following examples.
Example 1
A newly-built washing chamber wastewater treatment station in a certain petrochemical water plant, wherein the treatment scale is 240m3And D, COD of various wastewater inlet water is less than or equal to 8000 mg/L.
As shown in FIG. 5, the wastewater treatment process of this example is divided into the following sections:
(1-1) wastewater collection and pretreatment: the device comprises a separate collection unit 101, an anaerobic biochemical unit 102, an air flotation unit 103, an electro-Fenton oxidation unit 104 and a stripping unit 105, wherein the waste water generated in washing the cabin of each material is conveyed to the separate collection unit 101 through a pipeline, and in the separate collection unit 101, the waste water enters corresponding adjusting tanks respectively for storage and is pretreated respectively.
Wherein, the first kind of wastewater enters the anaerobic biochemical unit 102: raw water is sent into a tempering tank through a lift pump, various nutrient elements are added into the tempering tank, so that the optimum anaerobic pH range is achieved, and meanwhile, the necessary nutrient salts of anaerobic microorganisms are supplemented. The effluent of the conditioning tank enters an EGSB anaerobic reactor at a stable flow rate, in the process, part of the effluent after anaerobic treatment is circulated to a conditioning tank to facilitate alkalinity, and other effluent after anaerobic treatment automatically flows to an intermediate mixing tank under the action of gravity;
the second type of wastewater enters the air flotation unit 103: and lifting the sludge to an air floatation tank by a lifting pump, and carrying and removing the oil sludge to the water surface by two stages of air dissolving water generated by air floatation. The air floatation effluent automatically flows into an intermediate mixing tank, and the oil sludge generated by air floatation enters an oil sludge storage tank;
the third type of wastewater enters the electro-fenton oxidation unit 104: lifting the wastewater to an electro-Fenton oxidation tank by a lift pump, degrading macromolecules, toxic and harmful substances in the wastewater by adopting the strong oxidizing property of hydroxyl radicals, improving the biodegradability of the wastewater, and enabling the effluent of the electro-Fenton oxidation tank to automatically flow into an intermediate mixing tank;
the fourth type of wastewater enters the stripping unit 105: carry out the heat exchange through the pump delivery to the stripper front end heat exchanger, handle back outlet water with the stripper, preheat the incoming water, waste water gets into the stripper afterwards, through top of the tower water distribution system with waste water evenly distributed in the tower, steam gets into by the tower bottom, the inside two-stage packing bed of establishing of stripper, the gas-liquid is double-phase fully contacts in the packing bed, the interior ether class material of waste water shifts to in the gas phase, the stripper goes out water and gets into the intermediate mixing jar.
(1-2) comprehensive treatment of wastewater: the system comprises a mixing and tempering unit 106, a hydrolysis acidification unit 107, a primary aerobic biochemical unit 108, an ozone catalytic oxidation unit 109 and a biological ultra-clean fluidized bed unit 110, wherein the four types of wastewater are pretreated respectively and then enter the mixing and tempering unit 106 (a middle mixing tank) to be homogenized and equalized in water quality, N, P nutrient elements are added to facilitate subsequent biochemical treatment, and the COD concentration of mixed effluent is less than or equal to 1100 mg/L; the wastewater after the intermediate mixing tank enters a hydrolysis acidification unit 107 (hydrolysis acidification tank) for acidification treatment, and is connected to a primary aerobic biochemical unit 108.
Wherein, the primary aerobic biochemical unit 108 adopts a form of MBBR + MBR, and further removes COD in the water through aerobic biochemical action; the effluent of the MBR system is pumped to an ozone catalytic oxidation unit 109 and enters an ozone catalytic oxidation tower from the bottom, a catalyst bed layer is arranged in the catalytic oxidation tower, and ozone in water generates a large amount of hydroxyl radicals under the catalytic action of a ternary high-efficiency catalyst, so that COD in the wastewater is oxidized and decomposed, and meanwhile, the biodegradability of the wastewater is improved; the effluent of the ozone catalytic oxidation unit 109 enters an ultra-clean biological fluidized bed unit 110, and COD in the water is further removed through biochemical action, so that the effluent is ensured to reach the standard stably. The effluent of the 110-ultra-clean biological fluidized bed unit is buffered by a water outlet pool and then discharged after reaching the standard, and meets the first-level discharge standard of pollutant discharge Standard of urban wastewater treatment plants.
(1-3) sludge treatment: the sewage treatment plant sludge is mainly derived from oil sludge generated by the second-class wastewater pretreatment unit and activated sludge generated by the comprehensive wastewater unit, and is uniformly collected, enters a sludge storage tank and then is conveyed to a net-one conventional sludge treatment system.
The removal rates for each unit of this example are shown in the following table:
example 2
The treatment scale of a newly-built cabin-washing wastewater treatment station is 200m3And d, COD of various wastewater inlet water is less than or equal to 6000 mg/L.
As shown in fig. 6, the wastewater treatment process of this embodiment includes the following steps:
(2-1) wastewater collection and pretreatment: the device comprises a separate collection unit 201, an anaerobic biochemical unit 202, an air flotation unit 203 and a stripping unit 204, wherein the waste water generated in cabin washing of each material is conveyed to the separate collection unit 201 through a pipeline, and in the separate collection unit 201, the waste water enters corresponding adjusting tanks respectively for storage and is pretreated respectively.
Wherein, the first and third waste water enters the anaerobic biochemical unit 202: raw water is sent into a tempering tank through a lift pump, various nutrient elements are added into the tempering tank, so that the optimum anaerobic pH range is achieved, and meanwhile, the necessary nutrient salts of anaerobic microorganisms are supplemented. The effluent of the conditioning tank enters an EGSB anaerobic reactor at a stable flow rate, in the process, part of the effluent after anaerobic treatment is circulated to a conditioning tank to facilitate alkalinity, and other effluent after anaerobic treatment automatically flows to an intermediate mixing tank under the action of gravity;
it is worth mentioning that the acclimation period of the third type of wastewater is longer, so that the third type of wastewater is gradually released into the EGSB reactor at the initial debugging stage, and the rest of wastewater directly enters the intermediate mixing tank until the acclimation of the third type of anaerobic bacteria is completed.
The second type of wastewater enters the air flotation unit 203: lifting the mixture to an air floatation tank through a lifting pump, bringing oil sludge to the water surface through two stages of air dissolving water generated by air floatation and removing the oil sludge, enabling air floatation water to automatically flow into an intermediate mixing tank, and enabling the oil sludge generated by air floatation to enter an oil sludge storage tank.
The fourth type of wastewater enters the stripping unit 204: the waste water enters the tower from the bottom of the tower, two stages of packing beds are arranged in the stripping tower, gas-liquid phases are fully contacted in the packing beds, ether substances in the waste water are transferred to the gas phase, and the effluent of the stripping tower enters an intermediate mixing tank.
(2-2) comprehensive treatment of wastewater: the system comprises a mixing and tempering unit 205, a hydrolysis acidification unit 206, a primary aerobic biochemical unit 207, an ozone catalytic oxidation unit 208 and a biological ultra-clean fluidized bed unit 209, wherein the four types of wastewater are pretreated respectively and then enter the mixing and tempering unit 205 (a middle mixing tank) for homogenizing and equalizing the water quality, N, P nutrient elements are added for subsequent biochemical treatment, the COD concentration of mixed effluent is less than or equal to 1100 mg/L; the wastewater after the intermediate mixing tank enters a hydrolysis acidification unit 206 (hydrolysis acidification tank) for acidification treatment, and is connected to a primary aerobic biochemical unit 207.
The primary aerobic biochemical unit 207 adopts a form of MBBR + MBR, and further removes COD in the water through aerobic biochemical action; the effluent of the MBR system is pumped to an ozone catalytic oxidation unit 208, enters an ozone catalytic oxidation tower from the bottom, a catalyst bed layer is arranged in the catalytic oxidation tower, and ozone in water generates a large amount of hydroxyl radicals under the catalytic action of a ternary high-efficiency catalyst, so that COD in the wastewater is oxidized and decomposed, and meanwhile, the biodegradability of the wastewater is improved; the effluent of the ozone catalytic oxidation unit 208 enters an ultra-clean biological fluidized bed unit 209, and COD in the water is further removed through biochemical action, so that the effluent is ensured to reach the standard stably. The effluent of the ultra-clean biological fluidized bed unit 209 is buffered by the effluent pool and then discharged after reaching the standard, and meets the first-level discharge standard of pollutant discharge Standard of urban wastewater treatment plants.
(3-3) sludge treatment: the system comprises a sludge treatment unit 210, wherein the sludge of the sewage treatment station is mainly derived from oil sludge generated by a secondary wastewater pretreatment unit and activated sludge generated by a comprehensive wastewater unit, and is uniformly collected, enters a sludge storage tank and then is conveyed to a net-shaped existing sludge treatment system.
The removal rates for each unit of this example are shown in the following table:
by adopting the above embodiment 1 and embodiment 2, the present invention has the following advantages:
1. the invention provides a novel cabin washing wastewater combined treatment process, which can be used for classifying and storing cabin washing wastewater from the source and respectively pretreating each type of wastewater, has strong impact resistance and ensures wide applicability of the process; the mixed sewage after pretreatment is treated by adopting the processes of biochemistry, advanced oxidation and advanced biochemistry, so that the economical efficiency of system operation and the final effluent effect are ensured; compared with the process flow in which the whole flow is provided with the separated treatment, the investment cost and the operation cost of the process route of the invention are greatly reduced, and the application range of the process route of the invention is wider compared with the process flow in which the separated collection pretreatment is not arranged at the front end.
2. In the invention, each type of wastewater adopts a targeted pretreatment process, and the pretreatment process route has wide adaptability: the first kind of wastewater is easy to be biochemical, is treated by adopting a high-efficiency anaerobic method, can adapt to high-COD organic wastewater, and is economical and high-efficiency; the second type wastewater contains insoluble organic matters, and an air floatation process is adopted to remove insoluble organic pollutants, so that the treatment load of a subsequent process is reduced; the third type of wastewater has biological inhibition, and is pretreated by adopting an advanced oxidation method, so that the toxicity of the wastewater is reduced, and the stable operation of a subsequent biochemical process is ensured; the fourth category contains high-concentration organic pollutants with low boiling points, and is pretreated by a stripping method, so that on one hand, organic matters in the wastewater can be recovered, and meanwhile, the subsequent treatment difficulty is reduced; the mixed treatment route adopts the processes of biochemistry, advanced oxidation and deep biochemistry, the biochemical process ensures the economical efficiency of system operation, and the advanced oxidation process ensures the final water outlet effect of the system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A tank washing wastewater treatment system of a chemical raw material tank washing station is characterized by comprising a separate collection unit, an anaerobic biochemical unit, an air floatation unit, a steam stripping unit, a mixed conditioning unit, a hydrolytic acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit,
the split-type collecting unit comprises a first-type wastewater adjusting tank, a second-type wastewater adjusting tank, a third-type wastewater adjusting tank and a fourth-type wastewater adjusting tank, wherein cabin-washing wastewater containing pollutants which are soluble in water and have good biodegradability is stored in the first-type wastewater adjusting tank, cabin-washing wastewater containing pollutants which are insoluble in water and have poor biodegradability is stored in the second-type wastewater adjusting tank, cabin-washing wastewater containing pollutants which are soluble in water and have high boiling points and biological inhibition effects is stored in the third-type wastewater adjusting tank, and cabin-washing wastewater containing pollutants which are soluble in water, have low boiling points and have poor biodegradability is stored in the fourth-type wastewater adjusting tank;
the water outlet of the first-class wastewater adjusting tank is connected with the water inlet of the anaerobic biochemical unit, the water outlet of the second-class wastewater adjusting tank is connected with the water inlet of the air flotation unit, the water outlet of the fourth-class wastewater adjusting tank is connected with the water inlet of the steam stripping unit, the water outlets of the third-class wastewater adjusting tank, the anaerobic biochemical unit, the air flotation unit and the steam stripping unit are all connected with the water inlet of the mixed conditioning unit, the water outlet of the mixed conditioning unit is sequentially connected with a hydrolysis acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit, and the water outlet of the second-stage aerobic biochemical unit is connected with a municipal drainage pipe network;
the anaerobic biochemical unit is provided with a trace element adding pipe, a sodium hydroxide adding pipe and an anaerobic biological promoter adding pipe;
and an N/P nutrient solution supplementing pipe is arranged on the mixing and tempering unit.
2. The system for treating wastewater generated in washing the tanks of the chemical raw material washing station according to claim 1, wherein a first-stage advanced oxidation unit is arranged between the third-type wastewater adjusting tank and the mixing and tempering unit.
3. The system of claim 1, wherein the water outlets of the third wastewater regulating tank and the first wastewater regulating tank are connected to the water inlet of the anaerobic biochemical unit through a pipeline and a lift pump, respectively.
4. The system for treating the wastewater generated by washing the chemical raw materials in the tank-washing station according to claim 1 or 3, wherein the anaerobic biochemical unit comprises an EGSB (expanded granular sludge bed) conditioning tank, the water outlet of the first type wastewater conditioning tank is connected with the water inlet of the EGSB conditioning tank, the water outlet of the EGSB conditioning tank is connected with the water inlet of an EGSB anaerobic reactor, and the trace element adding pipe, the sodium hydroxide adding pipe and the anaerobic biological promoter adding pipe are distributed and connected with the EGSB conditioning tank;
a heat exchanger is arranged on a pipeline between the first type wastewater adjusting tank and the EGSB tempering tank;
a circulating pipe is communicated between the bottom and the upper part of one side of the EGSB tempering tank, and a feeding pump of an injection mixer is arranged on the circulating pipe;
and a sludge inlet of the EGSB anaerobic reactor is connected with an anaerobic sludge storage tank.
5. The system for treating the cabin-washing wastewater of the chemical raw material cabin-washing station according to claim 1, wherein the air-floating unit comprises an air-floating tank, a water outlet of the second-type wastewater adjusting tank is sequentially connected with the oil-separating tank and the air-floating tank, a lifting pump is arranged on a pipeline connecting the second-type wastewater adjusting tank and the oil-separating tank, oil sludge outlets of the oil-separating tank and the air-floating tank are connected with a sludge inlet of the sludge treatment unit, and a sludge outlet of the sludge treatment unit is connected with the clean-first sludge treatment system;
and the air floatation tank is connected with a PAC adding pipe and a PAM adding pipe.
6. The system for treating the washing wastewater of the chemical raw material washing station as claimed in claim 1, wherein the stripping unit comprises a stripping tower, a multi-stage packing bed layer is arranged in the stripping tower, the bottom of the stripping tower is connected with an external steam supply device, and a water outlet of the fourth type wastewater adjusting tank is connected with a water inlet of the stripping tower;
a lifting pump and a heat exchanger are arranged on a pipeline between the fourth type wastewater adjusting tank and the stripping tower, a water circulating pipe is communicated between the bottom and the upper part of one side of the stripping tower, and a circulating pump is arranged on the water circulating pipe.
7. The system of claim 1, wherein the mixing and tempering unit comprises an intermediate mixing tank and a stirrer, and the stirrer is arranged in the intermediate mixing tank;
the hydrolysis acidification unit comprises a hydrolysis acidification pool, and a water outlet of the middle mixing tank is connected with a water inlet of the hydrolysis acidification pool;
the primary aerobic biochemical unit comprises an MBBR tank and an MBR tank, the water outlet of the hydrolysis acidification tank is connected with the water inlet of the MBBR tank, the water outlet of the MBBR tank is connected with the water inlet of the MBR tank, and the bottoms of the MBBR tank and the MBR tank are connected with an external aeration fan;
and the sludge outlets of the hydrolysis acidification tank and the MBR tank are connected with a sludge storage tank.
8. The system of claim 1, wherein the secondary advanced oxidation unit is one of an electro-fenton oxidation tank, an electrolytic oxidation tank, and an ozone catalytic oxidation tower;
the secondary aerobic biochemical unit is one or a combination of an MBBR tank, an MBR tank and an ultra-clean biological fluidized bed.
9. A wastewater treatment process using the wastewater treatment system for washing the tanks of the chemical industry raw material tank washing station according to any one of claims 1 to 8, comprising the steps of:
(1) separately collecting and storing the cabin washing wastewater: conveying different materials of cabin washing wastewater to a pretreatment station through a pipeline, allowing the different materials of cabin washing wastewater to enter a separate adjusting tank for storage, wherein the cabin washing wastewater which is easy to dissolve in water and has better biodegradability enters a first type wastewater adjusting tank for storage, the wastewater which contains pollutants which are difficult to dissolve in water and have poor biodegradability enters a second type wastewater adjusting tank, the cabin washing water which contains pollutants which are easy to dissolve in water and have higher boiling points and biological inhibition enters a third type wastewater adjusting tank, and the cabin washing water which contains pollutants which are easy to dissolve in water, have lower boiling points and have poor biodegradability enters a fourth type wastewater adjusting tank;
(2) wastewater pretreatment: the wastewater of the first type wastewater adjusting tank enters an anaerobic biochemical unit for medium-temperature anaerobic treatment, the wastewater of the second type wastewater adjusting tank enters an air flotation unit for multi-stage dissolved air flotation treatment, the wastewater of the third type wastewater adjusting tank enters a first-stage advanced oxidation treatment unit for oxidation treatment, and the wastewater of the fourth type wastewater adjusting tank enters a stripping unit for ether substance vaporization treatment;
(3) comprehensive treatment of wastewater: the various types of wastewater treated in the step (2) flow into a mixing and tempering unit, are fully mixed in the mixing and tempering unit, and after the water quality is homogenized and equalized, the wastewater enters a hydrolysis acidification unit, a first-stage aerobic biochemical unit, a second-stage advanced oxidation unit and a second-stage aerobic biochemical unit in sequence through lifting or self-flowing by a pump;
(4) and the effluent of the secondary biochemical unit is directly discharged or connected to a municipal pipe network.
10. The wastewater treatment process of claim 9, wherein in the step (2), the first type wastewater in the first type wastewater regulation tank enters the anaerobic biochemical unit for treatment, and the treatment process comprises the following steps: feeding the first type of wastewater into an EGSB (expanded granular sludge bed) tempering tank through a lifting pump, adding various nutrient elements into the EGSB tempering tank to enable the first type of wastewater to reach an anaerobic optimal pH range, and simultaneously supplementing nutrient salts necessary for anaerobic microorganisms; the effluent of the tempering tank enters an EGSB anaerobic reactor at a stable flow rate, meanwhile, part of the effluent after anaerobic treatment is circulated to the EGSB tempering tank to facilitate alkalinity, and other effluent after anaerobic treatment automatically flows to a middle mixing tank of the mixing tempering unit under the action of gravity;
the treatment process for the second type wastewater in the second type wastewater adjusting tank to enter the air floatation unit comprises the following steps: lifting the second type wastewater to an air floatation tank through a lifting pump, carrying oil sludge to the water surface through two-stage dissolved air water generated by air floatation and removing, enabling air floatation effluent to automatically flow into a middle mixing tank of the mixing tempering unit, and enabling oil sludge generated by air floatation to enter an oil sludge storage tank;
the treatment process of the third type wastewater in the third type wastewater adjusting tank entering the first-stage advanced oxidation treatment unit comprises the following steps: lifting the third wastewater into an electro-Fenton oxidation tank of a first-stage advanced oxidation treatment unit through a lifting pump, degrading macromolecules, toxic and harmful substances in the wastewater by adopting the strong oxidizing property of hydroxyl radicals, and improving the biodegradability of the wastewater, wherein the effluent of the electro-Fenton oxidation tank automatically flows into a middle mixing tank of a mixing and tempering unit;
the treatment process of the fourth type wastewater in the fourth type wastewater adjusting tank entering the stripping unit comprises the following steps: carry fourth type waste water to stripper front end heat exchanger through the pump, go out the heat exchange with the stripper and handle the back and go out water, preheat the incoming water, waste water gets into the stripper afterwards, through top of the tower water distribution system with waste water evenly distributed in the stripper, steam gets into by the tower bottom of stripper, the inside two-stage bed of packing that establishes of stripper, the gas-liquid is two-phase fully contacts in the bed of packing, the ether class material shifts to in the waste water in the gas phase, the stripper goes out water and gets into the intermediate mixing tank who mixes the quenching and tempering unit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875983A (en) * | 2021-01-11 | 2021-06-01 | 武汉天源环保股份有限公司 | Quality-based treatment system and treatment method for port washing comprehensive wastewater |
| CN112939352A (en) * | 2021-02-04 | 2021-06-11 | 山东珺宜环保科技有限公司 | Treatment method of comprehensive sewage of industrial park |
| CN113754189A (en) * | 2021-09-06 | 2021-12-07 | 江苏丽天石化码头有限公司 | Multi-class cabin washing wastewater treatment system and treatment method |
| CN116081891A (en) * | 2023-02-16 | 2023-05-09 | 浙江省机电设计研究院有限公司 | Efficient environment-friendly chlorantraniliprole and intermediate production wastewater treatment process |
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2020
- 2020-09-24 CN CN202011014397.1A patent/CN112062419A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875983A (en) * | 2021-01-11 | 2021-06-01 | 武汉天源环保股份有限公司 | Quality-based treatment system and treatment method for port washing comprehensive wastewater |
| CN112939352A (en) * | 2021-02-04 | 2021-06-11 | 山东珺宜环保科技有限公司 | Treatment method of comprehensive sewage of industrial park |
| CN112939352B (en) * | 2021-02-04 | 2021-10-29 | 山东珺宜环保科技有限公司 | Treatment method of comprehensive sewage of industrial park |
| CN113754189A (en) * | 2021-09-06 | 2021-12-07 | 江苏丽天石化码头有限公司 | Multi-class cabin washing wastewater treatment system and treatment method |
| CN116081891A (en) * | 2023-02-16 | 2023-05-09 | 浙江省机电设计研究院有限公司 | Efficient environment-friendly chlorantraniliprole and intermediate production wastewater treatment process |
| CN116081891B (en) * | 2023-02-16 | 2023-11-17 | 浙江省机电设计研究院有限公司 | Efficient environment-friendly chlorantraniliprole and intermediate production wastewater treatment process |
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