CN112062420A - Treatment system and wastewater treatment process for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry - Google Patents

Treatment system and wastewater treatment process for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry Download PDF

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CN112062420A
CN112062420A CN202011022690.2A CN202011022690A CN112062420A CN 112062420 A CN112062420 A CN 112062420A CN 202011022690 A CN202011022690 A CN 202011022690A CN 112062420 A CN112062420 A CN 112062420A
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concentrated water
sewage
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荆建波
张营
张迪
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Nanjing Balance Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems

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Abstract

The invention provides a treatment system and a wastewater treatment process for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry. The invention provides a novel petrochemical industry circulating sewage and RO concentrated water combined treatment process with wide application range and strong impact resistance, the process is optimized, the route is clear and concise, and the sewage treatment process adopts sewage cleaning, shunting and quality-grading treatment aiming at the difference of the sewage types in the front-end circulating sewage and the RO concentrated water, so that the good treatment effect can be obtained, and the sewage treatment requirement can be met. According to the process provided by the invention, the removal rate of the whole COD can reach more than 95%, the removal rate of suspended matters (SS) can reach more than 98%, and the removal rate of total phosphorus can reach more than 90%.

Description

Treatment system and wastewater treatment process for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry
Technical Field
The invention relates to a wastewater treatment method, in particular to a treatment system and a wastewater treatment process for circulating sewage and RO concentrated water in the petrochemical industry.
Background
In the 80 s, 236 water-deficient cities in China have water deficiency with total water deficiency of 1.2X 107m3D; the water shortage in the first 90 s is increased to 300 seats, and the total water shortage is increased to 1.6 multiplied by 107m3And d. At present, more than 400 cities in China have water shortage, and the water shortage in 2030 years is expected to reach (4-5) x 1010m3。
According to statistics, in the petrochemical industry, the circulating sewage accounts for about 80% of water used in the petrochemical industry, direct discharge is not beneficial to resource saving, the circulating sewage can be subjected to advanced treatment, and can be reused for multiple purposes such as circulating sewage supplement, and the like, and the water quality is characterized in that the concentration of suspended matters in the incoming water is high, and most of the incoming water is non-soluble COD. If the circulating sewage can be recycled after advanced treatment, the huge gap of urban water shortage can be filled, the problem of shortage of water resources in China can be greatly relieved, the sewage discharge amount to the water environment is reduced, and great environmental benefits are brought while considerable economic benefits are brought.
Meanwhile, in the petrochemical industry, RO concentrated water produced by reverse osmosis process treatment has the characteristics of low biochemical efficiency due to the fact that the water quality of the RO concentrated water is characterized by containing organic matters which are difficult to degrade, and the wastewater biochemical property is improved by adopting a proper process to pretreat the RO concentrated water.
Therefore, the economic and efficient recycling pretreatment process for treating the circulating sewage and the RO concentrated water is developed and combined with the rear-end sewage recycling process to recycle the sewage, so that the method is an effective way for reducing the water pollution degree, improving the ecological environment and improving the urban water shortage problem, and has great social value and practical significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a treatment system and a wastewater treatment process for circulating sewage and RO concentrated water in the petrochemical industry, which have the advantages of strong impact resistance, wide application range, economy and high efficiency.
In order to solve the technical problems, the embodiment of the invention provides a system for treating circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry, which comprises a circulating sewage pretreatment unit, an RO concentrated water pretreatment unit, a biochemical treatment unit, a flocculation precipitation unit and a sludge dewatering unit, wherein a water inlet of the circulating sewage pretreatment unit is connected with a circulating sewage storage tank, a water inlet of the RO concentrated water pretreatment unit is connected with the RO concentrated water storage tank, water outlets of the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit are both connected with a water inlet of the biochemical treatment unit, a water outlet of the biochemical treatment unit is connected with a water inlet of the flocculation precipitation unit, and a water outlet of the flocculation precipitation unit is connected with a municipal drainage pipe network;
and the sludge outlets of the circulating sewage pretreatment unit and the flocculation precipitation unit are connected with the sludge inlet of the sewage dehydration unit.
The circulating sewage pretreatment unit adopts a multistage dissolved air flotation tank, an oil separation tank is arranged at the front end of the multistage dissolved air flotation tank, and a dosing system is arranged on the oil separation tank.
The RO concentrated water pretreatment unit is a primary advanced oxidation treatment unit and is one of an electro-Fenton oxidation unit, an electrolytic oxidation unit and an ozone oxidation unit.
Wherein, the flocculation precipitation unit adopts one or two combinations of a high-efficiency high-density precipitation system and a vertical sheet fiber cloth filter.
Wherein, the sewage dehydration unit adopts a stacked screw type sludge dehydrator.
The invention also provides a wastewater treatment process utilizing the treatment system for the petrochemical industry circulating sewage and the RO concentrated water, which comprises the following steps:
(1) pretreatment of circulating sewage: removing suspended matters in the circulating sewage by using a coagulation air flotation process or a multi-stage dissolved air flotation process, wherein the removal rate of COD is controlled to be 30-90%;
(2) pretreatment of RO concentrated water: adopting advanced oxidation process, hydroxyl free radical OH with strong oxidation capacity and organic pollutant in RO concentrated water carry out series free radical chain reaction to destroy the structure of RO concentrated water, so that the RO concentrated water is gradually degraded into harmless low molecular weight organic matter and finally degraded into CO2、H2O and other mineral salts, and improve the biochemical performance of the RO concentrated water;
(3) biochemical treatment: mixing the wastewater treated by the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit, then entering a biochemical treatment unit, and treating by adopting an aerobic biological method to reduce organic matters in the wastewater;
(4) flocculation and precipitation: the wastewater after passing through the biochemical treatment unit is treated in a flocculation precipitation unit by adopting a flocculation precipitation process, so that the total phosphorus and the residual suspended matters in the wastewater are reduced, and the effect that the wastewater can be discharged outside is achieved;
(5) sludge dewatering: the sludge generated by the circulating sewage pretreatment unit and the flocculation precipitation unit is subjected to preliminary dehydration in a sludge dehydration unit by adopting a dehydration process, and the sludge with the water content of 99 percent is dehydrated to the sludge with the water content of 85 percent for subsequent treatment of the sludge.
Wherein, the biochemical treatment unit in the step (3) is one of a biochemical tank, an MBBR tank, an MBR tank and an improved MBBR tank.
Wherein, the dehydration process in the step (5) is one of the traditional dehydration process and the stacked spiral sludge dehydration process.
The technical scheme of the invention has the following beneficial effects:
1. the invention provides a novel petrochemical industry circulating sewage and RO concentrated water combined treatment process with wide application range and strong impact resistance, the process is optimized, the route is clear and concise, and the sewage treatment process adopts sewage cleaning, shunting and quality-grading treatment aiming at the difference of the sewage types in the front-end circulating sewage and the RO concentrated water, so that the good treatment effect can be obtained, and the sewage treatment requirement can be met. According to the process provided by the invention, the removal rate of the whole COD can reach more than 95%, the removal rate of suspended matters (SS) can reach more than 98%, and the removal rate of total phosphorus can reach more than 90%.
2. The invention aims at COD which is difficult to degrade in RO concentrated water, adopts an electrolytic oxidation treatment process, and has the advantages of high efficiency, small occupied area, no sludge generation and easy operation.
3. In the invention, the treatment route of the mixed wastewater adopts a biochemical and flocculation precipitation process, the biochemical process ensures the economical efficiency of the system operation, and the flocculation precipitation ensures the final effluent effect of the system.
4. In the invention, the front end adopts a pretreatment process, so that the wide applicability of the whole process route is ensured, the rear end adopts a mixed treatment route, so that the economy of the treatment process is ensured, compared with the process that all the processes adopt separate treatment for the process flows, the investment cost and the operation cost of the process route are greatly reduced, and compared with the process that the front end is not provided with the separate collection pretreatment, the application range of the process route is wider.
5. The process flow of the invention has high automation degree when treating petrochemical circulating water and RO concentrated water, and fully-automatic operation without the need of staff on duty.
Drawings
FIG. 1 is a process flow diagram of the present invention;
fig. 2 is a block diagram of the present invention.
Description of reference numerals:
1. a multi-stage dissolved air flotation tank; 2. a high efficiency, high density sedimentation system; 3. a vertical sheet fiber cloth filter.
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 fig. 1, the invention provides a system for treating circulating sewage and RO concentrated water in petrochemical industry, comprising a circulating sewage pretreatment unit, an RO concentrated water pretreatment unit, a biochemical treatment unit, a flocculation precipitation unit and a sludge dewatering unit, wherein a water inlet of the circulating sewage pretreatment unit is connected with a circulating sewage storage tank, a water inlet of the RO concentrated water pretreatment unit is connected with the RO concentrated water storage tank, water outlets of the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit are both connected with a water inlet of the biochemical treatment unit, a water outlet of the biochemical treatment unit is connected with a water inlet of the flocculation precipitation unit, and a water outlet of the flocculation precipitation unit is connected with a municipal drainage pipe network;
and the sludge outlets of the circulating sewage pretreatment unit and the flocculation precipitation unit are connected with the sludge inlet of the sewage dehydration unit.
The circulating sewage pretreatment unit adopts a multistage dissolved air flotation tank 1, an oil separation tank is arranged at the front end of the multistage dissolved air flotation tank, and a dosing system is arranged on the oil separation tank.
The RO concentrated water pretreatment unit is a primary advanced oxidation treatment unit and is one of an electro-Fenton oxidation unit, an electrolytic oxidation unit and an ozone oxidation unit, and the electrolytic oxidation unit is preferred.
The flocculation precipitation unit adopts one or two combinations of a high-efficiency high-density precipitation system 2 and a vertical sheet fiber filter cloth filter 3, preferably selects the high-density precipitation system and the vertical sheet fiber filter cloth filter, further removes total phosphorus in wastewater by adding PAC and PAM in the high-density precipitation system, reduces SS (suspended solids) to ensure the operation effect of the subsequent vertical sheet filter cloth filter, reduces the frequency of backwashing and filter cloth replacement, and is used as a final water outlet control measure.
The sewage dehydration unit is a stacked screw type sludge dehydrator.
The invention also provides a wastewater treatment process utilizing the treatment system for the petrochemical industry circulating sewage and the RO concentrated water, which comprises the following steps:
(1) pretreatment of circulating sewage: because the circulating sewage pretreatment unit contains higher suspended solids and most of the circulating sewage pretreatment unit is non-soluble COD, the suspended solids of the waste water need to be removed, and the better treatment process for removing the suspended solids is a coagulation air flotation process or a multi-stage dissolved air flotation process, and the two modes can effectively remove the suspended solids of the circulating sewage and lay a good foundation for a subsequent biochemical treatment unit;
(2) pretreatment of RO concentrated water: adopting advanced oxidation process, hydroxyl free radical OH with strong oxidation capacity and organic pollutant in RO concentrated water carry out series free radical chain reaction to destroy the structure of RO concentrated water, so that the RO concentrated water is gradually degraded into harmless low molecular weight organic matter and finally degraded into CO2、H2O and other mineral salts, and improve the biochemical performance of the RO concentrated water;
(3) biochemical treatment: mixing the wastewater treated by the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit, then entering a biochemical treatment unit, and treating by adopting an aerobic biological method to reduce organic matters in the wastewater;
wherein, the biochemical treatment unit is selected from one of a biochemical tank, an MBBR tank, an MBR tank and an ultra-clean biological fluidized bed, and is preferably an improved MBBR.
(4) Flocculation and precipitation: the wastewater after passing through the biochemical treatment unit is treated in a flocculation precipitation unit by adopting a flocculation precipitation process, so that the total phosphorus and the residual suspended matters in the wastewater are reduced, and the effect that the wastewater can be discharged outside is achieved;
(5) sludge dewatering: the sludge generated by the circulating sewage pretreatment unit and the flocculation precipitation unit is subjected to preliminary dehydration in a sludge dehydration unit by adopting a dehydration process, and the sludge with the water content of 99 percent is dehydrated to the sludge with the water content of 85 percent for subsequent treatment of the sludge.
Wherein, the dehydration process is one of the traditional dehydration process and the stacked screw type sludge dehydration process.
The technical scheme of the invention is further illustrated by the following specific examples.
Example 1
A circulating sewage and RO concentrated water treatment station is newly built in a certain petrochemical water plant, and the treatment scale is that the water quantity of the circulating sewage is 250m3The water content of the RO concentrated water is 150m3The COD of the inlet water of various types of wastewater is less than or equal to 300mg/L, the SS is less than or equal to 200mg/L, and the total phosphorus is less than or equal to 6 mg/L.
As shown in fig. 1, the wastewater treatment process in this embodiment includes the following steps:
(1-1) pretreatment of circulating sewage: circulating sewage is pumped into the wastewater collection tank through a pump and then enters a coagulation air floatation process route, and the coagulation air floatation process has the advantages of small dosage, convenient operation and management and no need of large floor area; the coagulation air flotation process is adopted to pretreat the circulating sewage, so that a good foundation can be laid for a biochemical system;
(1-2) pretreatment of RO concentrated water: the RO concentrated water is pretreated by adopting an electro-catalysis technology, and a special catalyst with high-efficiency catalysis and high conductivity is added in an electrolytic bath to catalyze and generate hydroxyl radicals to oxidize organic matters in the water, so that the difficultly-degraded COD is further reduced, the difficultly-degraded COD is degraded into organic matters which are easy to biochemically, and a good foundation is laid for a subsequent biochemical system;
(1-3) Biochemical treatment Unit: the novel MBBR biological treatment system which combines the property of sewage entering a biochemical treatment unit and the MBBR technology, takes artificial porous biological filler as a core and takes an improved biological fluidized bed as a main body is characterized in that the biological filler material is hydrophilic, and the filling rate is 60-80%.
(1-4) a flocculation precipitation unit: the coagulating sedimentation system adopts a high-efficiency high-density process, further removes total phosphorus in the wastewater by adding PAC and PAM, reduces SS (suspended substances), ensures the operation effect of a subsequent vertical-piece filter cloth filter, and reduces the frequency of backwashing and filter cloth replacement. The filter element unit of riser fiber cloth filter is stereotyped production, and interchangeability is strong, can satisfy the requirement of different water yield lectotypes for the advanced treatment project of sewage sets up in conventional activated sludge process, can get rid of the running state that always suspends riser fiber cloth filter and include: and (5) filtering and backwashing.
(1-5) sludge dewatering Unit: the project sludge is mainly air floatation scum and sludge of a coagulating sedimentation system, is uniformly collected and enters a sludge concentration tank, and is subsequently dewatered by a stacked screw type sludge dewatering machine.
The removal rates for each unit of this example are shown in the following table:
Figure BDA0002701188460000061
Figure BDA0002701188460000071
the invention provides a novel petrochemical industry circulating sewage and RO concentrated water combined treatment process with wide application range and strong impact resistance, the process is optimized, the route is clear and concise, and the sewage treatment process adopts sewage cleaning, shunting and quality-grading treatment aiming at the difference of the sewage types in the front-end circulating sewage and the RO concentrated water, so that the good treatment effect can be obtained, and the sewage treatment requirement can be met. According to the process provided by the invention, the removal rate of the whole COD can reach more than 95%, the removal rate of suspended matters (SS) can reach more than 98%, and the removal rate of total phosphorus can reach more than 90%.
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.
Example 2
A circulating sewage and RO concentrated water treatment station is newly built in a water plant of a certain chemical enterprise, and the treatment scale is that the water volume of the circulating sewage is 200m3The water quantity of the RO concentrated water is 200m3The COD of the inlet water of various types of wastewater is less than or equal to 500mg/L, the SS is less than or equal to 300mg/L, and the total phosphorus is less than or equal to 5 mg/L.
As shown in fig. 1, the wastewater treatment process in this embodiment includes the following steps:
(1-1) pretreatment of circulating sewage: circulating sewage is pumped into the wastewater collection tank through a pump and then enters a coagulation air floatation process route, and the coagulation air floatation process has the advantages of small dosage, convenient operation and management and no need of large floor area; the coagulation air flotation process is adopted to pretreat the circulating sewage, so that a good foundation can be laid for a biochemical system;
(1-2) pretreatment of RO concentrated water: the RO concentrated water is pretreated by adopting an electro-catalysis technology, and a special catalyst with high-efficiency catalysis and high conductivity is added in an electrolytic bath to catalyze and generate hydroxyl radicals to oxidize organic matters in the water, so that the difficultly-degraded COD is further reduced, the difficultly-degraded COD is degraded into organic matters which are easy to biochemically, and a good foundation is laid for a subsequent biochemical system;
(1-3) Biochemical treatment Unit: the novel MBBR biological treatment system which combines the property of sewage entering a biochemical treatment unit and the MBBR technology, takes artificial porous biological filler as a core and takes an improved biological fluidized bed as a main body is characterized in that the biological filler material is hydrophilic, and the filling rate is 60-80%.
(1-4) a flocculation precipitation unit: the coagulating sedimentation system adopts a high-efficiency high-density process, further removes total phosphorus in the wastewater by adding PAC and PAM, reduces SS (suspended substances), ensures the operation effect of a subsequent vertical-piece filter cloth filter, and reduces the frequency of backwashing and filter cloth replacement. The filter element unit of riser fiber cloth filter is stereotyped production, and interchangeability is strong, can satisfy the requirement of different water yield lectotypes for the advanced treatment project of sewage sets up in conventional activated sludge process, can get rid of the running state that always suspends riser fiber cloth filter and include: and (5) filtering and backwashing.
(1-5) sludge dewatering Unit: the project sludge is mainly air floatation scum and sludge of a coagulating sedimentation system, is uniformly collected and enters a sludge concentration tank, and is subsequently dewatered by a stacked screw type sludge dewatering machine.
The removal rates for each unit of this example are shown in the following table:
Figure BDA0002701188460000081
the invention provides a novel petrochemical industry circulating sewage and RO concentrated water combined treatment process with wide application range and strong impact resistance, the process is optimized, the route is clear and concise, and the sewage treatment process adopts sewage cleaning, shunting and quality-grading treatment aiming at the difference of the sewage types in the front-end circulating sewage and the RO concentrated water, so that the good treatment effect can be obtained, and the sewage treatment requirement can be met. According to the process provided by the invention, the removal rate of the whole COD can reach more than 95%, the removal rate of suspended matters (SS) can reach more than 98%, and the removal rate of total phosphorus can reach more than 90%.
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 (8)

1. A petrochemical industry circulating sewage and RO (reverse osmosis) concentrated water treatment system is characterized by comprising a circulating sewage pretreatment unit, an RO concentrated water pretreatment unit, a biochemical treatment unit, a flocculation precipitation unit and a sludge dewatering unit, wherein a water inlet of the circulating sewage pretreatment unit is connected with a circulating sewage storage tank, a water inlet of the RO concentrated water pretreatment unit is connected with the RO concentrated water storage tank, water outlets of the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit are connected with a water inlet of the biochemical treatment unit, a water outlet of the biochemical treatment unit is connected with a water inlet of the flocculation precipitation unit, and a water outlet of the flocculation precipitation unit is connected with a municipal drainage pipe network;
and the sludge outlets of the circulating sewage pretreatment unit and the flocculation precipitation unit are connected with the sludge inlet of the sewage dehydration unit.
2. The system for treating the circulating sewage and the RO concentrated water in the petrochemical industry as claimed in claim 1, wherein the circulating sewage pretreatment unit employs a multi-stage dissolved air flotation tank, an oil separation tank is disposed at the front end of the multi-stage dissolved air flotation tank, and a dosing system is disposed on the oil separation tank.
3. The system for treating circulating sewage and RO concentrate of petrochemical industry as claimed in claim 1, wherein the RO concentrate pretreatment unit is a primary advanced oxidation treatment unit, which is one of an electro-Fenton oxidation unit, an electrolytic oxidation unit and an ozone oxidation unit.
4. The system for treating the circulating sewage and the RO concentrated water in the petrochemical industry according to claim 1, wherein the flocculation precipitation unit adopts one or two combinations of a high-efficiency high-density precipitation system and a vertical sheet fiber cloth filter.
5. The system for treating the circulating sewage and the RO concentrated water in the petrochemical industry as claimed in claim 1, wherein the sewage dewatering unit is a stacked screw type sludge dewatering machine.
6. A wastewater treatment process using the treatment system of the petrochemical industry circulating sewage and RO concentrated water according to any one of claims 1 to 5, comprising the steps of:
(1) pretreatment of circulating sewage: removing suspended matters in the circulating sewage by using a coagulation air flotation process or a multi-stage dissolved air flotation process, wherein the removal rate of COD is controlled to be 30-90%;
(2) RO concentrationWater pretreatment: adopting advanced oxidation process, carrying out series free radical chain reaction on hydroxyl radical OH with strong oxidation capacity and organic pollutants in RO concentrated water, destroying the structure of the RO concentrated water, gradually degrading the RO concentrated water into harmless low molecular weight organic matters and finally degrading the RO concentrated water into CO2、H2O and other mineral salts, and improve the biochemical performance of the RO concentrated water;
(3) biochemical treatment: mixing the wastewater treated by the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit, then entering a biochemical treatment unit, and treating by adopting an aerobic biological method to reduce organic matters in the wastewater;
(4) flocculation and precipitation: the wastewater after passing through the biochemical treatment unit is treated in a flocculation precipitation unit by adopting a flocculation precipitation process, so that the total phosphorus and the residual suspended matters in the wastewater are reduced, and the effect that the wastewater can be discharged outside is achieved;
(5) sludge dewatering: the sludge generated by the circulating sewage pretreatment unit and the flocculation precipitation unit is subjected to preliminary dehydration in a sludge dehydration unit by adopting a dehydration process, and the sludge with the water content of 99 percent is dehydrated to the sludge with the water content of 85 percent for subsequent treatment of the sludge.
7. The wastewater treatment process according to claim 6, wherein the biochemical treatment unit in the step (3) is one of a biochemical tank, an MBBR tank, an MBR tank and a modified MBBR tank.
8. The wastewater treatment process according to claim 6, wherein the dehydration process in the step (5) is one of a conventional dehydration process and a stacked-spiral sludge dehydration process.
CN202011022690.2A 2020-09-25 2020-09-25 Treatment system and wastewater treatment process for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry Pending CN112062420A (en)

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