CN214654321U

CN214654321U - MBR-ozone-BAF-based high-salt-content wastewater treatment system

Info

Publication number: CN214654321U
Application number: CN202120579562.1U
Authority: CN
Inventors: 陈国辉; 郭建军; 洪清纯; 叶伟华; 邓国健; 王敏
Original assignee: Guangdong Yuekang Environmental Protection Co ltd
Current assignee: Guangdong Yuekang Environmental Protection Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-09
Anticipated expiration: 2031-03-22

Abstract

A treatment system for high-salt-content wastewater based on MBR-ozone-BAF comprises a first regulating reservoir, an MBR membrane pool, a second regulating reservoir, an ozone tower, a digestion pool, a BAF pool, a water outlet storage tank, a first dissolved air pump, a second dissolved air pump and a backwashing pump which are sequentially communicated, wherein the ozone tower is connected with an ozone generator through the first dissolved air pump, the backwashing pump is connected with the bottom of the BAF pool and the water outlet storage tank, and backwashing effluent is mixed with residual ozone in the ozone tower through the second dissolved air pump and then enters the digestion pool; the water outlet storage tank is respectively connected with the water inlets of the first regulating tank, the second regulating tank and the BAF tank through water pumps; the ozone tower is provided with a packing layer. The utility model discloses can effectively get rid of organic matter and suspended solid in the waste water, make and reach emission standard, the further utilization of drawing of the follow-up inorganic salt of being convenient for, and degree of automation is high, improves the life and the treatment effect of corresponding unit, really realizes the zero release.

Description

MBR-ozone-BAF-based high-salt-content wastewater treatment system

Technical Field

The utility model relates to a waste water treatment technical field especially relates to a high processing system who contains salt waste water based on MBR-ozone-BAF.

Background

Salt-containing waste water is generally referred to as waste water containing a high concentration of soluble inorganic salts, which contains a large amount of Cl^-、SO₄ ^2-、Na⁺、Ca²⁺Inorganic salt ions and various pollutants such as COD, nitrogen, phosphorus and the like, wherein the high-salinity wastewater generally refers to wastewater with the salt content (calculated by the mass fraction of sodium chloride) of not less than 1 percent and is considered as typical wastewater difficult to treat. The high-salt-content wastewater can not only corrode pipelines and equipment and influence the service life of wastewater conveying and treating facilities, but also cause soil salinization and pollute underground water once the wastewater is discharged into the ecological environment of a water body.

At present, the treatment technology of salt-containing wastewater can be divided into a physical method, a chemical method and a biological method. Among them, the physical method is to change the water quality only by phase separation, and cannot remove the contaminants in the water. The chemical method has certain advantages due to higher conductivity of the high-salt wastewater, but is easy to generate secondary pollution. Biological methods have major limitations in the application of treating high salinity wastewater: too high a salt concentration can lead to microbial dehydration death; the enzyme protein reduces the activity of dehydrogenase due to salting out; chloride ions can poison bacteria; the reduction of sulfate ions to hydrogen sulfide inhibits microbial growth. In addition, the sewage density is increased due to the excessively high salt concentration, the specific gravity difference between the sewage and microorganisms is reduced, the sludge flocculation effect is poor, the zoogloea is difficult to settle when floating in the water, and the sewage treatment effect is influenced. In summary, in the prior art of salt-containing wastewater, the COD removal effect by the physical method and the biological method is poor, and the treatment cost by the chemical method is high and is not easy to be accepted by enterprises.

On one hand, organic matters in the reuse water after the high-salt-content wastewater is treated by a biochemical process are difficult to remove by adopting a conventional treatment technology, on the other hand, the treatment of the tail-end high-salt-content wastewater is the key of zero discharge of the wastewater, the crystal salt generated by treating the tail-end high-salt-content wastewater by adopting the conventional evaporation-crystallization technology cannot be effectively utilized, main salts need to be extracted according to the industrial salt standard in a quality division manner in the evaporation-crystallization process section, and the residual organic matters in the wastewater are one of important influence factors influencing the purity of the crystal salt. Therefore, a proper wastewater treatment technology is urgently needed to be found for efficiently removing organic matters in the wastewater with high salt content, so that the real zero emission and the comprehensive utilization of the crystallized salt can be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide a can contain the organic matter among the salt waste water to the height and carry out high efficiency get rid of, maintainability is high, realize the zero release based on MBR-ozone-BAF's the high processing system who contains salt waste water.

The utility model discloses a realize through following technical scheme:

a treatment system for high-salt-content wastewater based on MBR-ozone-BAF comprises a first regulating reservoir, an MBR membrane pool, a second regulating reservoir, an ozone tower, a digestion reservoir, a BAF pool and an effluent storage tank which are sequentially communicated, wherein the first regulating reservoir is used for regulating the pH value, the water quality and the water quantity of wastewater raw water, the MBR membrane pool is used for carrying out biochemical and membrane separation treatment on the wastewater, and the second regulating reservoir is used for carrying out homogenization treatment on the water quality and the water quantity of effluent from the MBR membrane pool; the ozone tower is connected with an ozone generator and is used for carrying out oxidation treatment on the wastewater; the digestion tank is internally provided with a first aeration device which is used for quenching the oxidation free radicals and blowing off the gas of the wastewater from the ozone tower; the BAF pool is provided with a filler layer and a second aeration device and is mainly used for further biochemical treatment and filtration treatment of organic matters and suspended solids in the wastewater. The wastewater can enter the inorganic salt extraction process after being monitored by the effluent storage tank to reach the standard.

MBR membrane cisterna mainly used gets rid of most BOD in the waste water, holds back solid-state suspended solid, colloid and some macromolecule organic matters, and wherein most organic matters and solid suspended solid etc. can be got rid of to general waste water through MBR membrane cisterna's biodegradation, membrane separation, but when the organic matters of non-biodegradable in the waste water is more, COD still can be higher after MBR membrane cisterna handles, is difficult to reach emission standard, and the biodegradability is poor, needs further processing. Ozone oxidation is mainly used for oxidizing and degrading organic matters which are difficult to biodegrade in wastewater. The BAF pool is mainly used for further biochemical treatment and filtration treatment of degraded micromolecular organic matters, residual organic matters and suspended solids in the wastewater.

Furthermore, a first dissolved air pump is arranged between the second regulating reservoir and the ozone tower, an air inlet of the first dissolved air pump is connected with the ozone generator, a water inlet of the first dissolved air pump is connected with the second regulating reservoir, a water outlet of the first dissolved air pump is connected with the ozone tower, and the wastewater in the second regulating reservoir is mixed with ozone through the first dissolved air pump and then is conveyed into the ozone tower for oxidation treatment.

The BAF pool is characterized by further comprising a backwashing pump, wherein a backwashing water inlet is formed in the bottom of the BAF pool, one end of the backwashing pump is connected with the water outlet storage tank, the other end of the backwashing pump is connected with the backwashing water inlet, and the backwashing pump is used for pumping water in the water outlet storage tank into the bottom of the BAF pool according to a set program to perform backwashing on the BAF pool. The back flushing time of the BAF tank can be set to be once every 24h, and the program is set to automatically flush.

And further, the device also comprises a second dissolved air pump, a backwashing water outlet is arranged at the top of the BAF pool, an air inlet of the second dissolved air pump is connected with the top of the ozone tower, a water inlet of the second dissolved air pump is connected with the backwashing water outlet, a water outlet of the second dissolved air pump is connected with the digestion pool, backwashing effluent is mixed with residual ozone in the ozone tower through the second dissolved air pump and then enters the digestion pool for further subsequent treatment, namely quenching and gas stripping of the oxidation free radicals are carried out, and then the backwashing effluent enters the BAF pool for further treatment.

Furthermore, the outlet water of the outlet water storage tank is respectively connected with the water inlet of the first regulating reservoir, the water inlet of the second regulating reservoir and the water inlet of the BAF pool through a water pump. Discharging the wastewater which does not reach the standard in the effluent storage tank into a corresponding treatment process according to the monitoring index condition of the wastewater for further treatment, and if the BOD content is higher, pumping the wastewater into a first regulating tank to regulate the pH value, water quality and water quantity and the like, and then feeding the wastewater into an MBR membrane tank for biochemical and membrane separation treatment; when the solid suspended matter is more, the solid suspended matter directly enters a BAF pool for filtration treatment. Or the water inlet of the second dissolved air pump is connected with the water outlet of the water outlet storage tank through a two-position three-way valve, and the second dissolved air pump is used for mixing the effluent which does not reach the standard in the water outlet storage tank with the residual ozone in the ozone tower and then conveying the mixture into the digestion tank for retreatment.

Furthermore, an MBR membrane module, a tubular aerator, a sludge return pipe and a water production pipe are arranged in the MBR membrane tank, the tubular aerator and the sludge return pipe are arranged at the bottom of the MBR membrane tank, the MBR membrane module is arranged above the tubular aerator, the water production pipe is connected with the water outlet end of the MBR membrane module, the water production pipe is connected with a self-priming pump, and the back-flushing pump is respectively connected with the water outlet storage tank, the back-flushing inlet of the BAF tank and the water production pipe through a two-position three-way valve and is used for back-flushing the BAF membrane module and the MBR membrane module respectively according to a set program. Backwashing the BAF tank and the MBR membrane module is generally carried out separately, when the BAF tank is backwashed, a two-position three-way valve is controlled to enable a water outlet storage tank to be communicated with the BAF tank, and a backwash pump pumps the effluent in the water outlet storage tank into the bottom of the BAF tank; when the back flushing of the MBR membrane pool is carried out, the water outlet storage tank is communicated with the water production pipe on the MBR membrane assembly, and the outlet water in the water outlet storage tank enters the MBR membrane assembly. The back flushing can be set to be carried out once per 8-10h, the flushing time is 5-8min, and the back flushing can be automatically carried out by setting a program.

Furthermore, a packing layer is arranged in the ozone tower, a water inlet of the ozone tower is arranged at the bottom, a water outlet of the ozone tower is arranged at the top, and the contact time of water and air is prolonged.

Furthermore, the packing layer has two layers, and the two layers are respectively arranged at the bottom and the middle part of the ozone tower through stainless steel grating plates, and the packing in the packing layer is ceramic multi-surface ball packing.

Furthermore, the bottom of the ozone tower is provided with a washing water inlet, and the top of the ozone tower is provided with a washing water outlet for washing the filler in the ozone tower.

Furthermore, a water outlet pipe in a shape of a Chinese character 'hui' is arranged at the top of the BAF pool, a plurality of water outlet holes are formed in the water outlet pipe in the shape of a Chinese character 'hui', and the water outlet of the BAF pool is communicated with the water outlet pipe in the shape of a Chinese character 'hui'.

Furthermore, the apopore has a plurality of groups along returning the shape outlet pipe evenly distributed, and every group has two, and the symmetry sets up respectively hole up in the position that is 45 contained angles with the vertical axis of the circular cross-section of returning the shape outlet pipe.

The utility model discloses a to the high salt waste water through MBR biochemistry and membrane separation in proper order, ozone oxidation, BAF pond biochemical filtration processing, make waste water successively through organic matter biochemical degradation, membrane separation, organic matter ozone oxidation degradation, organic matter biochemical degradation, filtration etc. handle, effectively get rid of organic matter and suspended solid in the waste water, including biochemical degradation and the organic matter that is difficult to biochemical degradation, reduce the colourity of waste water, make and reach emission standard, be convenient for to the further extraction and utilization of salt in the clear water after handling, improve the utilization efficiency of the high salt waste water that contains; the treated effluent automatically performs back flushing on the BAF tank and the MBR membrane according to program setting, the automation degree is high, the treatment effect of the BAF tank and the MBR membrane tank can be further ensured, the service lives of the MBR membrane and the BAF filter tank are prolonged, and the treatment efficiency of the whole high-salinity wastewater is ensured; impurities such as sludge are contained in the backwash water, and the impurities are mixed with residual ozone in the ozone tower to reduce the sludge and then enter the digestion tank for further treatment, so that the backwash water is prevented from being discharged outside, and zero emission is really realized; by monitoring the effluent quality, when the effluent is not up to standard for some reasons, the wastewater is refluxed to the corresponding unit in the system for treatment again according to the specific index condition of the wastewater which is not up to standard, the wastewater is treated in a targeted manner, the efficiency of wastewater treatment is improved, and the situation that the subsequent extraction and utilization of inorganic salt are influenced by the wastewater which is not up to standard and the wastewater is discharged out to reach the standard is also avoided. The utility model discloses the effective combination of waste water treatment process has fairly high clearance to the organic matter in the high salt waste water that contains to guaranteed to handle the emission requirement of water quality of water, made water quality of water can stably reach "urban sewage treatment plant emission standard" one-level A standard.

Drawings

Fig. 1 is a frame structure diagram of an embodiment of the present invention.

Fig. 2 is another frame structure diagram according to the embodiment of the present invention.

Fig. 3 is a schematic structural view of an ozone tower in an embodiment of the present invention.

Fig. 4 is a schematic structural view of a section a-a in fig. 3.

Fig. 5 is a schematic view of the distribution of the water outlet holes in fig. 4.

Fig. 6 is a schematic structural diagram of a BAF pool in an embodiment of the present invention.

Fig. 7 is a structural view of a section B-B in fig. 6.

Fig. 8 is a schematic view of the distribution of the water outlet holes in fig. 7.

Fig. 9 is a schematic structural diagram of an MBR membrane tank in an embodiment of the present invention.

Reference numerals: 1-a first conditioning tank; 2-MBR membrane tank; 3-a second regulating reservoir; 4-a first dissolved air pump; 5-an ozone tower; 6-digestion pool; 7-BAF pool; 8-a water outlet storage tank; 9-a second dissolved air pump; 10-an ozone generator; 11-a backwash pump; 12-a flow meter; 13-a water pump; 21-MBR membrane module; 22-a sludge return pipe; 23-a tubular aerator; 24-a water production pipe; 51-a first water inlet; 52-a grid plate; 53-a filler layer; 54-a first water outlet; 55-exhaust port; 56-first return outlet pipe; 561-a first water outlet; 71-a second water inlet; 72-backwash water inlet; 73-long handle filter head; 74-a support plate; 75-an aerator pipe; 76-an aerator; 77-a filler; 78-a second water outlet; 79-a second square water outlet pipe; 791-second water outlet.

Detailed Description

A treatment system of wastewater with high salt content based on MBR-ozone-BAF is shown in figure 1 and comprises a first regulating reservoir 1, an MBR membrane reservoir 2, a second regulating reservoir 3, an ozone tower 5, a digestion reservoir 6, a BAF reservoir 7 and an effluent storage tank 8 which are sequentially communicated, wherein the first regulating reservoir 1 is used for regulating the pH value, the water quality and the water quantity of wastewater raw water, the MBR membrane reservoir is used for carrying out biochemical and membrane separation treatment on the wastewater, and the second regulating reservoir 3 is used for carrying out homogeneous treatment on the water quality and the water quantity of effluent from the MBR membrane reservoir 2; the ozone tower 5 is connected with an ozone generator 10 and is used for carrying out oxidation treatment on the wastewater; the digestion tank 6 is internally provided with a first aeration device which is used for quenching the oxidation free radicals and blowing off the gas of the wastewater from the ozone tower 5; the BAF tank 7 is provided with a filler layer 53 and a second aeration device for carrying out biochemical filtration treatment on the wastewater. The digestion pool 6 can prolong the reaction time to improve the oxidation removal rate on one hand, and can also quench the oxidized groups along with the prolonging of the time on the other hand. The wastewater can enter the inorganic salt extraction process after being monitored by the effluent storage tank to reach the standard.

MBR membrane cisterna 2 mainly used gets rid of most BOD in the waste water, holds back solid-state suspended solid, colloid and some macromolecule organic matters, and wherein most organic matters and solid suspended solid etc. can be got rid of through MBR membrane cisterna's biodegradation, membrane separation to general waste water, but when the organic matters of non-biodegradable in the waste water is more, COD still can be higher after MBR membrane cisterna handles, is difficult to reach emission standard, and the biodegradability is poor, needs further processing. Ozone oxidation is mainly used for oxidizing and degrading organic matters which are difficult to biodegrade in wastewater. The BAF tank 7 is mainly used for further biochemical treatment and filtration treatment of degraded micromolecular organic matters, residual organic matters and suspended solids in the wastewater.

In this embodiment, a first dissolved air pump 4 is disposed between the second regulating reservoir 3 and the ozone tower 5, an air inlet of the first dissolved air pump 4 is connected to the ozone generator 10, a water inlet of the first dissolved air pump 4 is connected to the second regulating reservoir 3, a water outlet of the first dissolved air pump 4 is connected to the ozone tower 5, and the wastewater in the second regulating reservoir 3 is mixed with ozone by the first dissolved air pump 4 and then is transported into the ozone tower 5 for oxidation treatment.

In this embodiment, a back-flushing pump 11 is further provided, a back-flushing water inlet 72 is provided at the bottom of the BAF tank 7, one end of the back-flushing pump 11 is connected to the water outlet storage tank 8, and the other end of the back-flushing pump is connected to the back-flushing water inlet 72, and is used for pumping water in the water outlet storage tank 8 into the bottom of the BAF tank 7 according to a set program to back-flush the BAF tank 7. The back flushing time of the BAF tank can be set to be once every 24h, and the program is set to automatically flush.

In this embodiment, a second dissolved air pump 9 is further provided, a back washing water outlet (the same outlet as the second water outlet 78) is provided at the top of the BAF tank 7, an air inlet of the second dissolved air pump 9 is connected with the top of the ozone tower 5, a water inlet of the second dissolved air pump 9 is connected with the back washing water outlet, a water outlet of the second dissolved air pump 9 is connected with the digestion tank 6, and back washing water is mixed with residual ozone in the ozone tower 5 by the second dissolved air pump 9 and then enters the digestion tank 6 for further processing, that is, quenching and gas stripping of the oxidized radicals are performed, and then the mixture enters the BAF tank 7 for further processing. The first dissolved air pump 4 and the second dissolved air pump 9 are respectively connected with a flowmeter 12.

The effluent of the effluent storage tank 8 simultaneously enters the bottom of the BAF pool 7 through a backwash pump 11, the BAF pool 7 is backwashed according to the program setting, the backwashed effluent is mixed with the residual ozone in the ozone tower 5 through a second dissolved air pump 9, then enters the digestion pool 6 for quenching of oxidation free radicals and gas stripping, and then enters the BAF pool 7 for further treatment. The BAF pool 7 is backwashed by using the treated water, so that water can be saved, impurities such as activated sludge can be mixed in the backwash water, the backwash water is mixed with the residual ozone in the ozone tower 5, so that the sludge can be reduced, the treated backwash water sequentially enters the digestion pool 6 and the BAF pool 7 for secondary treatment, and zero discharge of wastewater is thoroughly realized.

Other structure of BAF tank 7 can refer to the existing BAF structure, and can be shown in fig. 6, and includes a second water inlet 71 and a backwash water inlet 72 arranged at the bottom, a support plate 74 is arranged above the second water inlet 71 and the backwash water inlet 72, a long-handle filter head 73 is arranged on the support plate 74, an aeration pipe 75 is arranged above the long-handle filter head 73, an aeration head 76 is arranged on the aeration pipe 75, a filler 77 is arranged above the aeration head 76, a second water outlet 78 is arranged at the top of BAF tank 7, and the second water outlet 78 and the backwash outlet can share one outlet.

In this embodiment, as shown in fig. 7, a second square water outlet pipe 79 is disposed at the top of the BAF tank 7, a plurality of second water outlet holes 791 are disposed on the second square water outlet pipe 79, and the second water outlet 78 of the BAF tank 7 is communicated with the second square water outlet pipe 79. As shown in fig. 8, the second outlet hole 791 has a plurality of groups uniformly distributed along the second square-shaped outlet pipe 79, each group has two, and the two outlet holes are symmetrically arranged at positions forming an included angle of 45 degrees with the vertical axis of the circular cross section of the second square-shaped outlet pipe 79.

As above, the effluent which does not reach the standard in the effluent storage tank 8 may flow back to the first regulating reservoir 1, the MBR membrane pool 2, the second regulating reservoir 3, the ozone tower 5, the digestion pool 6 or the BAF pool 7 for further treatment according to the monitoring index condition of the wastewater, as one of the embodiments, as shown in fig. 2, the effluent of the effluent storage tank 8 is respectively connected with the water inlet of the first regulating reservoir 1, the water inlet of the second regulating reservoir 3, and the water inlet of the BAF pool 7 through a water pump 13. The wastewater which does not reach the standard in the effluent storage tank 8 is discharged into a corresponding treatment process for further treatment according to the monitoring index condition, if the BOD content is higher, the wastewater is pumped into a first regulating tank 1 to regulate the pH value, water quality and water quantity and the like and then enters an MBR membrane tank 2 for biochemical and membrane separation treatment; when the solid suspension is more, the solid suspension directly enters the BAF pool 7 for filtration treatment. Or the water inlet of the second dissolved air pump 9 is connected with the water outlet of the water outlet storage tank 8 through a two-position three-way valve at the same time, and the second dissolved air pump 9 is used for mixing the effluent which does not reach the standard in the water outlet storage tank 8 with the residual ozone in the ozone tower 5 and then conveying the mixture into the digestion tank 6 for retreatment.

As one embodiment, as shown in fig. 9, an MBR membrane module 21, a pipe aerator 23, a sludge return pipe 22 and a water production pipe 24 are arranged in the MBR membrane tank 2, the pipe aerator 23 and the sludge return pipe 22 are arranged at the bottom of the MBR membrane tank 2, the MBR membrane module 21 is arranged above the pipe aerator 23, the water production pipe 24 is connected with the water outlet end of the MBR membrane module 21, and the water production pipe 24 is connected with a self-priming pump. In the using process of the MBR membrane, the permeability of the MBR membrane is reduced due to impurities in sludge and wastewater, and the filtration efficiency is reduced, so that the MBR membrane also needs to be maintained or replaced, as shown in fig. 1 and 2, the backwash pump 11 is respectively connected with the effluent storage tank 8, the backwash inlet of the BAF tank 7 and the water production pipe 24 through a two-position three-way valve, and is used for respectively backwashing the BAF tank 7 and the MBR membrane module 21 according to a set program. The backwashing of the BAF tank 7 and the MBR membrane module 21 is generally carried out separately, when the BAF tank 7 is backwashed, a two-position three-way valve is controlled to enable a water outlet storage tank 8 to be communicated with the BAF tank 7, and a backwash pump 11 pumps a water outlet pump 13 in the water outlet storage tank 8 into the bottom of the BAF tank 7; when the MBR membrane tank 2 is backwashed, the effluent storage tank 8 is communicated with the upper water production pipe 24 of the MBR membrane module 21, and effluent in the effluent storage tank 8 enters the MBR membrane module 21. The back flushing can be set to be carried out once per 8-10h, the flushing time is 5-8min, and the back flushing can be automatically carried out by setting a program.

As one embodiment, as shown in fig. 3, a packing layer 53 is disposed in the ozone tower 5, a first water inlet 51 of the ozone tower 5 is disposed at the bottom, and a first water outlet 54 is disposed at the top, so as to increase the time for water and air to contact. In this embodiment, the packing layer 53 has two layers, which are respectively disposed at the bottom and the middle of the ozone tower 5 through the stainless steel grating plates 52, and the packing 77 in the packing layer 53 is a ceramic polyhedral ball packing 77. The longer the contact time of ozone with water, the more thorough the mixing, the better the oxidation effect of ozone. The utility model discloses in make waste water and ozone mix through dissolved air pump, guarantee that the aqueous vapor fully contacts to the form of fixed bed has set up double-deck ceramic polyhedral ball filler 77, and filler 77 has increased the double-phase area of contact of gas-liquid, has prolonged contact time, and ozone can carry out fully contact with waste water owing to block the existence of liquid phenomenon when passing through packing layer 53.

In order to ensure the treatment efficiency of the ozone tower, as shown in fig. 3, in the present embodiment, the bottom of the ozone tower 5 is provided with a washing water inlet, and the top is provided with a washing water outlet, mainly washing the packing layer 53. The top is provided with an exhaust port 55, and the residual ozone can be used for reduction treatment of sludge. Similar to BAF, as shown in fig. 4, the top of the ozone tower 5 is also provided with a first circular water outlet pipe 56, the first circular water outlet pipe 56 is provided with a plurality of first water outlet holes 561, the first water outlet holes 54 are communicated with the first circular water outlet pipe 56, and the wastewater treated by the ozone tower 5 is discharged out of the ozone tower 5 through the first circular water outlet pipe 56 and the first water outlet holes 54 by the first water outlet holes 561. As shown in fig. 5, the first outlet 561 has a plurality of groups uniformly distributed along the first circular outlet 56, each group has two, and the two outlets are symmetrically disposed at positions forming an included angle of 45 ° with the vertical axis of the circular cross section of the first circular outlet 56.

The utility model discloses the waste water that is directed against contains salt rate height, is not suitable for the growth of general microorganism, consequently needs to tame the change with the adaptation environment to the microorganism in MBR membrane cisterna 2, the BAF pond 7, the utility model discloses earlier stage activated sludge's tame is as cultivateing the water source with domestic sewage, and the high proportion that contains salt waste water that increases pending gradually in intaking, or improves the high concentration that contains salt waste water, through constantly changing domestic sewage and the high proportion that contains salt waste water raw water, makes the microorganism constantly adapt to living environment, and the high full load that contains salt waste water requirement that gradually reaches pending reaches and very high treatment effeciency is up.

The utility model discloses a high salt wastewater treatment system that contains handles high salt petrochemical industry district waste water, and the raw water salinity is 14.3-19.5g/L, and the treatment effect sees table 1.

TABLE 1 treatment Effect of wastewater from a high salt-containing petrochemical region

Index (I)

COD

BOD

Ammonia nitrogen

Total nitrogen

Total phosphorus

SS

Unit of

mg/L

Quality of raw water

＜700-1000

＞250

＜50

＜3

--

Quality of effluent of MBR tank

＜300

＜100

＜10

＜20

＜0.6

--

Effluent quality of effluent storage tank

＜50

＜6

＜2

＜15

＜0.5

＜20

Table 2 is according to the utility model discloses a system carries out the effect evaluation of handling to the waste water that gets into in the second equalizing basin 3, and the waste water of intaking for getting into in the second equalizing basin 3 goes out the clear water after the processing of water for following in the play water storage tank 8.

TABLE 2 Water quality of inlet and outlet water and removal rate of each pollutant

Note: the first class A standard is specified in the first class A Standard of pollutant discharge Standard of urban Sewage treatment plants.

Can find out by above data, the utility model discloses it is very big to the treatment effect of the high salt waste water that contains, to COD, BOD, nitrogen phosphorus and suspended solid etc. all have better removal effect, the MBR workshop section makes COD, BOD, index such as nitrogen phosphorus descends by a wide margin, subsequent ozone oxidation, the BAF process further reduces these indexes to accord with emission standard, especially the removal effect to the COD that is difficult to handle is showing, can reach the clearance more than 80%, compare in the COD clearance of the current same kind of quality of water generally 50% -60% left and right sides, great advantage has, and the index of play water quality has been guaranteed, make play water quality of water can stably reach "town sewage treatment plant emission standard" one-level A standard. And the system can automatically carry out the back flush of the MBR membrane and the BAF tank, the back flush water can be processed in real time, the maintainability of equipment can be greatly improved in actual operation, the efficiency is improved, the labor is reduced, the service life of consumed parts is prolonged, and the operation cost is indirectly reduced.

The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.

Claims

1. The system for treating the high-salt-content wastewater based on the MBR-ozone-BAF is characterized by comprising a first regulating reservoir, an MBR membrane reservoir, a second regulating reservoir, an ozone tower, a digestion reservoir, a BAF reservoir and an effluent storage tank which are sequentially communicated, wherein the first regulating reservoir is used for regulating the pH value, the water quality and the water amount of wastewater raw water, the MBR membrane reservoir is used for carrying out biochemical and membrane separation treatment on the wastewater, and the second regulating reservoir is used for carrying out homogeneous treatment on the water quality and the water amount of effluent from the MBR membrane reservoir; the ozone tower is connected with an ozone generator and is used for carrying out oxidation treatment on the wastewater; the digestion tank is internally provided with a first aeration device which is used for quenching the oxidation free radicals and blowing off the gas of the wastewater from the ozone tower; the BAF pool is provided with a packing layer and a second aeration device and is used for carrying out biochemical filtration treatment on the wastewater.

2. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 1, wherein a first dissolved air pump is arranged between the second regulating reservoir and the ozone tower, an air inlet of the first dissolved air pump is connected with the ozone generator, an water inlet of the first dissolved air pump is connected with the second regulating reservoir, an water outlet of the first dissolved air pump is connected with the ozone tower, and wastewater in the second regulating reservoir is mixed with ozone by the first dissolved air pump and then is conveyed into the ozone tower for oxidation treatment.

3. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 1, further comprising a back-washing pump, wherein the bottom of the BAF tank is provided with a back-washing water inlet, one end of the back-washing pump is connected with the outlet water storage tank, and the other end of the back-washing pump is connected with the back-washing water inlet and is used for pumping water in the second regulating tank into the bottom of the BAF tank to back-wash the BAF tank.

4. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 3, further comprising a second dissolved air pump, wherein a backwash water outlet is arranged at the top of the BAF tank, an air inlet of the second dissolved air pump is connected with the top of the ozone tower, an air inlet of the second dissolved air pump is connected with the backwash water outlet, an air outlet of the second dissolved air pump is connected with the digestion tank, and backwash effluent is mixed with residual ozone in the ozone tower through the second dissolved air pump and then enters the digestion tank for quenching of oxidation radicals and gas stripping.

5. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 4, wherein an MBR membrane module, a tubular aerator, a sludge return pipe and a water production pipe are arranged in the MBR membrane tank, the tubular aerator and the sludge return pipe are arranged at the bottom of the MBR membrane tank, the MBR membrane module is arranged above the tubular aerator, the water production pipe is connected with the water outlet end of the MBR membrane module, the water production pipe is connected with a self-priming pump, and the back-flushing pump is respectively connected with the water outlet storage tank, the back-flushing inlet of the BAF tank and the water production pipe through a two-position three-way valve and is used for back-flushing the BAF tank and the MBR membrane module.

6. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 4, wherein the water inlet of the second dissolved air pump is simultaneously connected with the water outlet of the water outlet storage tank through a two-position three-way valve, and the water outlet storage tank is used for mixing the effluent which does not reach the standard with the residual ozone in the ozone tower through the second dissolved air pump and then conveying the mixture into the digestion tank for retreatment; or the outlet water of the outlet water storage tank is respectively connected with the water inlet of the first regulating reservoir, the water inlet of the second regulating reservoir and the water inlet of the BAF pool through a water pump.

7. The MBR-ozone-BAF based high salinity wastewater treatment system according to claim 1, wherein the ozone tower is provided with a packing layer, the water inlet of the ozone tower is arranged at the bottom, and the water outlet of the ozone tower is arranged at the top, so that the water-air contact time is increased.

8. The MBR-ozone-BAF-based high-salinity wastewater treatment system according to claim 7, wherein the filler layer comprises two layers, the two layers are respectively arranged at the bottom and the middle part of the ozone tower through stainless steel grating plates, and the filler in the filler layer is ceramic multi-face ball filler.

9. The MBR-ozone-BAF based high-salinity wastewater treatment system according to claim 1, wherein a water outlet pipe with a shape of a Chinese character 'hui' is arranged at the top of the BAF tank, a plurality of water outlet holes are arranged on the water outlet pipe with a shape of a Chinese character 'hui', and the water outlet of the ozone tower is communicated with the water outlet pipe with a shape of a Chinese character 'hui'.

10. The MBR-ozone-BAF-based high salinity wastewater treatment system according to claim 9, wherein the water outlet holes are distributed in a plurality of groups, two in each group, uniformly distributed along the rectangular outlet pipe, and are symmetrically arranged at positions which form an included angle of 45 degrees with the vertical axis of the circular cross section of the rectangular outlet pipe in an upward direction.