CN212293244U - Treatment system for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry - Google Patents
Treatment system for circulating sewage and RO (reverse osmosis) concentrated water in petrochemical industry Download PDFInfo
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- CN212293244U CN212293244U CN202022129616.2U CN202022129616U CN212293244U CN 212293244 U CN212293244 U CN 212293244U CN 202022129616 U CN202022129616 U CN 202022129616U CN 212293244 U CN212293244 U CN 212293244U
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Abstract
The utility model provides a processing system of petrochemical industry circulation blowdown water and RO dense water, including circulation blowdown pretreatment of water unit, RO dense water pretreatment of water unit, biochemical treatment unit, flocculation and precipitation unit, sludge dewatering unit. The utility model provides a novel petrochemical industry circulation blow off water and the dense water combination treatment process of RO that application scope is wide, shock resistance is strong, process optimization, route are clear succinct, to the difference of front end circulation blow off water and the dense aquatic sewage type of RO, adopt the reposition of redundant personnel of decontaminating to handle by matter, can gain fine treatment effect, satisfy the sewage treatment demand. The utility model provides a process, whole COD's clearance can reach more than 95%, and Suspended Solid (SS) clearance can reach more than 98%, and the clearance of total phosphorus can reach more than 90%.
Description
Technical Field
The utility model relates to a wastewater treatment system, concretely relates to processing system of petrochemical industry circulation blow off water and RO dense water.
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.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a processing system of petrochemical industry circulation blow off water and RO dense water, shock resistance is strong, application scope is wide, economy is high-efficient.
In order to solve the technical problem, an embodiment of the present invention provides a system for treating petrochemical industry circulating sewage and RO concentrated water, 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 to a circulating sewage storage tank, a water inlet of the RO concentrated water pretreatment unit is connected to the RO concentrated water storage tank, water outlets of the circulating sewage pretreatment unit and the RO concentrated water pretreatment unit are both connected to a water inlet of the biochemical treatment unit, a water outlet of the biochemical treatment unit is connected to a water inlet of the flocculation precipitation unit, and a water outlet of the flocculation precipitation unit is connected to 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 wastewater treatment process utilizing the treatment system for the circulating sewage and the RO concentrated water in the petrochemical industry comprises the following 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) 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 and make it gradually degraded into harmless low molecular weight organic matterAnd finally degraded to 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 utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
1. the utility model provides a novel petrochemical industry circulation blow off water and the dense water combination treatment process of RO that application scope is wide, shock resistance is strong, process optimization, route are clear succinct, to the difference of front end circulation blow off water and the dense aquatic sewage type of RO, adopt the reposition of redundant personnel of decontaminating to handle by matter, can gain fine treatment effect, satisfy the sewage treatment demand. The utility model provides a process, whole COD's clearance can reach more than 95%, and Suspended Solid (SS) clearance can reach more than 98%, and the clearance of total phosphorus can reach more than 90%.
2. The utility model adopts the electrolytic oxidation treatment process aiming at the COD which is difficult to degrade in the RO concentrated water, and has the advantages of high efficiency, small occupied area, no sludge production and easy operation.
3. The utility model discloses in, the processing route after the waste water mixes has adopted biochemistry + flocculation and precipitation's technology, and biochemical technology guarantees the economic nature of system operation, and the final play water effect of system has been guaranteed in flocculation and precipitation.
4. The utility model discloses in, the front end takes pretreatment process, has guaranteed the extensive suitability of whole process route, and the rear end adopts the mixed processing route, has guaranteed treatment process's economic nature, compares and all adopts the branch to put in the full flow and handle and supply process flow, the utility model discloses the investment cost and the running cost of process route are with greatly reduced, compare not set up the branch in the front end and put the process flow who collects the pretreatment, the utility model discloses process route's application scope is more extensive.
5. The utility model discloses a process flow is when handling petrochemical industry circulating water and RO dense water, and its degree of automation is high, and full automatic operation need not staff's 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 to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model provides a petrochemical industry circulation blowdown water and RO dense water processing system, including circulation blowdown pretreatment of water unit, RO dense water pretreatment of water unit, biochemical treatment unit, flocculation and precipitation unit, sludge dewatering unit, the water inlet of circulation blowdown pretreatment of water unit links to each other with circulation blowdown water storage tank, the water inlet of RO dense water pretreatment of water unit links to each other with RO dense water storage tank, the delivery port of circulation blowdown pretreatment of water unit and RO dense water pretreatment of water unit all links to each other with biochemical treatment unit's water inlet, biochemical treatment unit's delivery port links to each other with flocculation and precipitation unit's water inlet, flocculation and precipitation unit's delivery port links to each other with 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 1, 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 utility model also provides an utilize the effluent disposal technology of foretell petrochemical industry circulation blowdown water and the processing system of the dense water of RO, include following step:
(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 solution of the present invention will be further explained with reference to 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:
the utility model provides a novel petrochemical industry circulation blow off water and the dense water combination treatment process of RO that application scope is wide, shock resistance is strong, process optimization, route are clear succinct, to the difference of front end circulation blow off water and the dense aquatic sewage type of RO, adopt the reposition of redundant personnel of decontaminating to handle by matter, can gain fine treatment effect, satisfy the sewage treatment demand. The utility model provides a process, whole COD's clearance can reach more than 95%, and Suspended Solid (SS) clearance can reach more than 98%, and the clearance of total phosphorus can reach more than 90%.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
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:
the utility model provides a novel petrochemical industry circulation blow off water and the dense water combination treatment process of RO that application scope is wide, shock resistance is strong, process optimization, route are clear succinct, to the difference of front end circulation blow off water and the dense aquatic sewage type of RO, adopt the reposition of redundant personnel of decontaminating to handle by matter, can gain fine treatment effect, satisfy the sewage treatment demand. The utility model provides a process, whole COD's clearance can reach more than 95%, and Suspended Solid (SS) clearance can reach more than 98%, and the clearance of total phosphorus can reach more than 90%.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114560598A (en) * | 2022-03-03 | 2022-05-31 | 天津海之凰科技有限公司 | Treatment method of reverse osmosis concentrated water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114560598A (en) * | 2022-03-03 | 2022-05-31 | 天津海之凰科技有限公司 | Treatment method of reverse osmosis concentrated water |
| CN114560598B (en) * | 2022-03-03 | 2024-04-16 | 天津海之凰科技有限公司 | Treatment method of reverse osmosis concentrated water |
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