CN215250123U - Recycling system in purified water production - Google Patents
Recycling system in purified water production Download PDFInfo
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- CN215250123U CN215250123U CN202120601107.7U CN202120601107U CN215250123U CN 215250123 U CN215250123 U CN 215250123U CN 202120601107 U CN202120601107 U CN 202120601107U CN 215250123 U CN215250123 U CN 215250123U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
A recycling system in purified water production comprises a raw water tank, a pretreatment device, a primary reverse osmosis membrane, a secondary reverse osmosis membrane, an electric desalting module and a purified water tank, wherein the raw water tank is connected with the primary reverse osmosis membrane through the pretreatment device so as to convey pretreated raw water to the primary reverse osmosis membrane, a pure water output end of the primary reverse osmosis membrane is connected with the secondary reverse osmosis membrane so as to convey produced pure water to the secondary reverse osmosis membrane, and a pure water output end of the secondary reverse osmosis membrane is connected with the electric desalting module so as to convey produced pure water to the electric desalting module; the concentrated water output end of the second-stage reverse osmosis membrane is connected to the raw water tank so as to enable the produced concentrated water to flow back to the raw water tank for reuse; the concentrated water output end of the electric desalting module is connected to the raw water tank so as to return the produced concentrated water to the raw water tank for reuse. The utility model has smaller occupied area and high installation efficiency; and a process combining double-stage reverse osmosis and continuous electric desalting technology is adopted, so that the reverse osmosis desalting rate is high, the produced water quality is high, and the cost and the price are low.
Description
Technical Field
The utility model relates to a purified water produces technical field, concretely relates to recycle system in purified water production.
Background
The purified water (also called deionized water or deep desalted water) refers to water with the conductivity less than or equal to 5.1 muS/cm when the temperature is higher than 25 ℃, and is mainly applied to the industries of medicine, biology, chemistry and chemical industry, hospitals and the like.
Ordinary water contains various ions such as sodium ions, chloride ions and the like, however, some fields in chemistry or physics need extremely pure water which cannot contain any ions, and ordinary water cannot meet the requirements of some chemical reactions, so that the ions in the water need to be removed through some equipment, and the obtained product is purified water.
The purified water equipment is characterized in that tap water is used as a raw material, purified water is prepared by layer-by-layer filtration (pretreatment system → primary RO system → secondary RO system → EDI system), and in order to ensure the quality of produced water, the utilization rate of water is primary reverse osmosis: 60% -70%; secondary reverse osmosis: 70% -80%; EDI: 90% -95%, that is to say, each stage can generate concentrated water (water with more impurities and high salinity). Many purified water devices on the market directly discharge concentrated water, so that resource waste is caused, and a large amount of discharged concentrated water is treated, so that the enterprise cost is greatly increased.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides an improve water resource utilization ratio, and reduction in production cost's recycle system in the purified water production.
In order to achieve the above object, the utility model provides a recycle system in purified water production, including former water pitcher, preprocessing device, one-level reverse osmosis membrane, second grade reverse osmosis membrane, electric desalination module and purification water pitcher, wherein:
the raw water tank is connected with the primary reverse osmosis membrane through the pretreatment device so as to convey pretreated raw water to the primary reverse osmosis membrane, the pure water output end of the primary reverse osmosis membrane is connected with the secondary reverse osmosis membrane so as to convey the pure water produced by the primary reverse osmosis membrane to the secondary reverse osmosis membrane, and the pure water output end of the secondary reverse osmosis membrane is connected with the electric desalting module so as to convey the pure water produced by the secondary reverse osmosis membrane to the electric desalting module;
the concentrated water output end of the secondary reverse osmosis membrane is connected to the raw water tank so as to return the produced concentrated water to the raw water tank for reuse; the concentrated water output end of the electric desalting module is connected to the raw water tank so as to return the produced concentrated water to the raw water tank for reuse;
the output end of the electric desalting module is divided into two paths, wherein one path is connected to the purified water tank so as to store the purified water reaching the standard into the purified water tank, and the other path is connected to the raw water tank so as to reflux the pure water which does not reach the standard into the raw water tank for recycling.
As a further preferred technical scheme of the utility model, the output side of electricity desalination module is equipped with conductivity detection device, according to conductivity detection device is right the purified water of electricity desalination module output advances to detect, thereby it is right two branches of the output of electricity desalination module carry out selectivity and export.
As the utility model discloses a further preferred technical scheme, preprocessing device includes raw water pump, many media filter, demineralizer, active carbon filter and the safety filter that connects gradually through the pipeline, raw water pump is used for providing power and loops through many media filter, demineralizer, active carbon filter and safety filter with the raw water of pumping in the raw water jar, the safety filter is connected to one-level reverse osmosis membrane.
As a further preferred technical solution of the present invention, the softener is further provided with a salt tank for filling salt water into the softener to regenerate the ion exchange resin in the softener by adding salt.
As a further preferred technical scheme of the utility model, the softener is two sets, two sets the softener is series connection, and one set of salt case of two sets of softener sharing is in order to carry out the salt solution filling.
As a further preferred technical scheme of the utility model, the demineralizer with the pipeline is equipped with plate heat exchanger between the active carbon filter, plate heat exchanger is used for external industry steam to carry out the heat exchange with the raw water of carrying the active carbon filter front end.
As a further preferred technical scheme of the utility model, the input front end of one-level reverse osmosis membrane is equipped with the first-level high-pressure pump, the input front end of second grade reverse osmosis membrane is equipped with the second-level high-pressure pump.
As the utility model discloses a further preferred technical scheme, be equipped with the pH regulator on the pipeline that is connected between one-level reverse osmosis membrane and the second grade reverse osmosis membrane, the pH regulator is used for carrying out the pH value to the pure water of one-level reverse osmosis membrane production and detects to add pH regulation medicament according to the testing result and adjust with the pH value to the pure water of one-level reverse osmosis membrane production in this section pipeline.
As a further preferred technical solution of the present invention, the multi-media filter, the softener and the activated carbon filter each have a tank body, each tank body has a forward and backward flushing structure, each tank body is connected to a main pipeline of an output side of the raw water pump sequentially through the respective forward and backward flushing structure, raw water flows in the main pipeline in a single direction, and the raw water flowing in the single direction flows through the tank bodies in the forward or backward direction through the forward and backward flushing structure;
the positive and negative flushing structure comprises a first automatic control valve, a second automatic control valve, a third automatic control valve, a fourth automatic control valve, a fifth automatic control valve, an upper connecting pipe, a lower connecting pipe and a sewage discharge pipe; the first automatic control valve and the second automatic control valve are sequentially connected in series in the main pipeline along the water flow direction, a pipe section between the first automatic control valve and the second automatic control valve is communicated with one end of a lower connecting pipe, and the other end of the lower connecting pipe is communicated with the bottom end of the tank body; one end of a third automatic control valve is connected with the main pipeline at the output end of the first automatic control valve, the other end of the third automatic control valve is connected with one end of an upper connecting pipe, and the other end of the upper connecting pipe is communicated with the top end of the tank body; the upper connecting pipe is communicated with a first branch communicated with the sewage discharge pipe, the fourth automatic control valve is arranged on the first branch, the lower connecting pipe is communicated with a second branch communicated with the sewage discharge pipe, and the fifth automatic control valve is arranged on the second branch.
The utility model discloses a recycle system in purified water production, because preliminary treatment stage and one-level reverse osmosis stage have carried out filtration layer upon layer to the raw water, the concentrated water that second grade reverse osmosis membrane and electric desalination module produced to and the quality of water that electric desalination module produced the water that fails is purer than former running water, select drainage return raw water jar cyclic utilization, improved water resource utilization, reduction in production cost; the whole pure water production line is integrally designed and modularly installed, and compared with the existing equipment, the pure water production line has the advantages of smaller floor area and higher installation efficiency; the technology of combining double-stage reverse osmosis and continuous electric desalting technology (EDI) is adopted, so that the reverse osmosis desalting rate is high, the produced water quality is high, and the cost and the price are low.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of an embodiment of a recycling system for purified water production according to the present invention;
FIG. 2 is a schematic structural diagram of an example provided by the recycling system in the purified water production of the present invention;
FIG. 3 is a schematic view of the connection between the tank and the forward/reverse flushing structure.
In the figure: 1. the system comprises a raw water tank, 2, a raw water pump, 3, a multi-media filter, 4, a softener, 5, an activated carbon filter, 6, a salt tank, 7, a cartridge filter, 8, a primary high-pressure pump, 9, a primary reverse osmosis membrane, 10, a pH regulator, 11, a secondary high-pressure pump, 12, a secondary reverse osmosis membrane, 13, an electric desalting module, 14 and a purified water tank;
101. the sewage treatment system comprises a tank body, 102, a main pipeline, 103, an upper connecting pipe, 104, a lower connecting pipe, 105, a sewage discharge pipe, AT1, a first automatic control valve, AT2, a second automatic control valve, AT3, a third automatic control valve, AT4, a fourth automatic control valve, AT5 and a fifth automatic control valve.
The purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for the sake of clarity only, and are not intended to limit the scope of the invention, its relative relationship between the terms and their derivatives, and the scope of the invention should be understood as being limited by the claims.
As shown in fig. 1 and 2, the recycling system in purified water production comprises a raw water tank 1, a pretreatment device, a first-stage reverse osmosis membrane 9, a second-stage reverse osmosis membrane 12, an electric desalting module 13 and a purified water tank 14, wherein:
the raw water tank 1 is connected with the primary reverse osmosis membrane 9 through the pretreatment device so as to convey pretreated raw water to the primary reverse osmosis membrane 9, the pure water output end of the primary reverse osmosis membrane 9 is connected with the secondary reverse osmosis membrane 12 so as to convey the pure water produced by the primary reverse osmosis membrane to the secondary reverse osmosis membrane 12, the pure water output end of the secondary reverse osmosis membrane 12 is connected with the electric desalting module 13 so as to convey the pure water produced by the secondary reverse osmosis membrane to the electric desalting module 13, a water production main channel of the whole purified water production is formed from the raw water tank 1 to the electric desalting module 13, and continuous purified water production is realized through industrial control;
the first-stage reverse osmosis membrane 9 and the second-stage reverse osmosis membrane 12 are connected in series to form a two-stage reverse osmosis structure, so that the produced water quality is high. Reverse osmosis, also known as reverse osmosis, is a process for removing ions from water by using pressure difference as driving force and reverse osmosis of raw water against natural osmosis. In the working process of the first-stage reverse osmosis membrane 9 and the second-stage reverse osmosis membrane 12, pure water, namely penetrating fluid, is produced through the low-pressure side of the membranes; concentrated water, i.e., a concentrated solution, is obtained through the high pressure side of the membrane.
The electric desalting module 13, also called an EDI system, achieves the purpose of deep desalting of water by the selective permeation of cation and anion membranes to cations and the exchange of ions in water by ion exchange resins under the action of an electric field, and further converts pure water produced by the secondary reverse osmosis membrane 12 into purified water.
The concentrated water obtained at the concentrated water output end of the first-stage reverse osmosis membrane 9 has relatively high salt concentration, and is usually directly discharged without being utilized; the concentrated water output end of the second-stage reverse osmosis membrane 12 is connected to the raw water tank 1 so as to return the produced concentrated water to the raw water tank 1, and the salt content of the second-stage concentrated water is greatly reduced and returns to the raw water tank 1 for cyclic utilization, so that water resources can be saved; the concentrated water output end of the electric desalting module 13 is connected to the raw water tank 1 so as to enable the produced concentrated water to flow back to the raw water tank 1, the concentrated water generated by the electric desalting module 13 has lower salinity compared with the raw water, and the concentrated water flows back to the raw water tank 1 for recycling in order to save water sources;
the output end of the electric desalting module 13 is divided into two paths, wherein one path is connected to the purified water tank 14 to store up-to-standard purified water into the purified water tank 14, the other path is connected to the raw water tank 1 to return substandard purified water to the raw water tank 1 for recycling, the purified water generated by the electric desalting module 13 is selectively output, the up-to-standard storage is realized, unqualified purified water needs to be treated again, the production quality of the purified water is ensured, the purified water is recycled, and resources and energy are saved.
Preferably, an electrical conductivity detection device is disposed at an output side of the electric desalting module 13, and purified water produced by the electric desalting module 13 is detected by the electrical conductivity detection device, so that two branches at the output end of the electric desalting module 13 are selectively output.
In one specific implementation, the pretreatment device comprises a raw water pump 2, a multi-media filter 3, a softener 4, an activated carbon filter 5 and a security filter 7 which are sequentially connected through a pipeline, wherein the raw water pump 2 is used for providing power to pump raw water in a raw water tank 1 and sequentially passes through the multi-media filter 3, the softener 4, the activated carbon filter 5 and the security filter 7, and the security filter 7 is connected to a first-stage reverse osmosis membrane 9. The raw water pump 2 provides power for the whole pretreatment channel, raw water in the raw water tank 1 is pumped and sequentially passes through the multi-media filter 3, the softener 4, the activated carbon filter 5 and the security filter 7, and meanwhile, the raw water meets the requirements on pressure, flow and water quality before passing through the pretreatment device and reaching the primary reverse osmosis membrane 9; the multi-medium filter 3 is composed of 3-5 filtering layers by utilizing different particle sizes of natural quartz sand and is used for filtering impurities such as fine particles, suspended matters, colloids and the like in raw water; the softener 4 removes calcium and magnesium ions in water by using sodium cation exchange resin, reduces the hardness of raw water, and prevents the subsequent primary reverse osmosis membrane 9 and secondary reverse osmosis membrane 12 from scaling on the surface, namely, influences on water yield and service performance; the activated carbon filter 5 is used for adsorbing organic matters, oxidants, pigments and peculiar smells in raw water, and simultaneously plays a role in protecting the first-stage reverse osmosis membrane 9 and the second-stage reverse osmosis membrane 12 from being oxidized and damaging RO membrane elements; the security filter 7 is used for preventing particles larger than or equal to 5 mu m from entering the reverse osmosis membrane and preventing the first reverse osmosis membrane 9 and the second reverse osmosis membrane 12 from being polluted, blocked and damaged.
The input ends of the activated carbon filter 5 and the raw water pump 2 are also connected with a return pipe, after the channels of the activated carbon filter 5 and the cartridge filter 7 are disconnected, the activated carbon filter 5 and the cartridge filter 7 are selected to be connected with the return pipe, and the multi-media filter 3, the softener 4 and the activated carbon filter 5 can be cleaned and disinfected in a circulating mode under the power provided by the raw water pump 2. The return pipe is also provided with a one-way valve so that water in the return pipe can only flow in one way.
In specific implementation, the softener 4 is operated for a period of time, the ion exchange resin used for filtering and treating water in the softener 4 reaches a saturated state, salt is required to be added to realize ion regeneration, and the salt tank 6 is matched with the softener 4, and the salt tank 6 is used for filling salt water into the softener 4 so that the ion exchange resin in the softener 4 is regenerated by adding salt.
Preferably, there are two sets of the softeners 4, the two sets of the softeners 4 are connected in series, and the two sets of the softeners 4 share one salt tank 6 for filling salt water. The two sets of softeners 4 are connected in series for use, so that the water treatment capacity is improved, and the water production quality is ensured.
In another specific implementation, a pipe between the softener 4 and the activated carbon filter 5 is provided with a plate heat exchanger, and the plate heat exchanger is used for externally connecting industrial steam to perform heat exchange on raw water conveyed to the front end of the activated carbon filter 5. The input front end of the first-stage reverse osmosis membrane 9 is provided with a first-stage high-pressure pump 8, and the input front end of the second-stage reverse osmosis membrane 12 is provided with a second-stage high-pressure pump 11.
Preferably, a pH regulator 10 is arranged on a pipeline connected between the first-stage reverse osmosis membrane 9 and the second-stage reverse osmosis membrane 12, the pH regulator 10 is used for detecting the pH value of the pure water produced by the first-stage reverse osmosis membrane 9, adding a pH regulating agent into the pipeline according to the detection result so as to regulate the pH value of the pure water produced by the first-stage reverse osmosis membrane 9, and after adding liquid medicine, enabling CO in the water to be regulated2Conversion to HCO3 -And CO3 2-So as to be removed by reverse osmosis, thereby ensuring the quality of the produced water of the secondary reverse osmosis membrane 12.
In yet another embodiment, the multimedia filter 3, the softener 4 and the activated carbon filter 5 are provided with tanks 101, each tank 101 is provided with a positive and negative flushing structure, each tank 101 is connected to a main pipeline 102 on the output side of the raw water pump 2 through the respective positive and negative flushing structure in sequence, raw water flows in the main pipeline 102 in a unidirectional way, and the unidirectional raw water can flow through the tanks 101 in a positive or negative direction through the positive and negative flushing structures;
the positive and negative flushing structure comprises a first automatic control valve AT1, a second automatic control valve AT2, a third automatic control valve AT3, a fourth automatic control valve AT4, a fifth automatic control valve AT5, an upper connecting pipe 103, a lower connecting pipe 104 and a sewage discharge pipe 105; the first automatic control valve AT1 and the second automatic control valve AT2 are sequentially connected in series in the main pipeline 102 along the water flow direction, a pipe section between the first automatic control valve AT1 and the second automatic control valve AT2 is communicated with one end of a lower connecting pipe 104, and the other end of the lower connecting pipe 104 is communicated with the bottom end of the tank body 101; one end of a third automatic control valve AT3 is connected with the main pipeline 102 AT the output end of the first automatic control valve AT1, the other end of the third automatic control valve AT3 is connected with one end of an upper connecting pipe 103, and the other end of the upper connecting pipe 103 is communicated with the top end of the tank body 101; the upper connecting pipe 103 is communicated with a first branch communicated with the sewage discharge pipe 105, the fourth automatic control valve AT4 is arranged on the first branch, the lower connecting pipe 104 is communicated with a second branch communicated with the sewage discharge pipe 105, and the fifth automatic control valve AT5 is arranged on the second branch.
The multi-media filter 3, the softener 4 and the activated carbon filter all have a positive back flush mode, a back flush mode and a normal operation mode, and the operation principle of each mode is described by taking one tank body 101 as an example, and is shown in fig. 3:
in the forward washing mode, AT1 and AT1 are opened, other valves are closed, raw water enters the tank body 101 from the AT1 valve through the upper connecting pipe 103 and is discharged to the outside from the lower AT1, and AT the moment, the tank body 101 is flushed by water in the forward direction;
in the backwashing mode, AT1 and AT1 are opened, other valves are closed, raw water enters the tank body 101 from the AT1 through the lower connecting pipe 104 and is discharged outside from the upper AT1, and AT the moment, the tank body 101101 is flushed by reverse water;
in normal water production mode, AT1 and AT1 are opened, other valves are closed, raw water enters the tank 101 from the upper AT1 valve, flows out from the lower AT1 valve and enters the next step of filtration.
The forward and reverse flushing modes can repeatedly perform forward flushing and reverse flushing in the tank body 101 according to preset time so as to achieve the effect of cleaning the inside of the tank body 101.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many changes and modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (9)
1. The utility model provides a recycle system in purified water production which characterized in that, includes former water pitcher, preprocessing device, one-level reverse osmosis membrane, second grade reverse osmosis membrane, electric desalination module and purification water pitcher, wherein:
the raw water tank is connected with the primary reverse osmosis membrane through the pretreatment device so as to convey pretreated raw water to the primary reverse osmosis membrane, the pure water output end of the primary reverse osmosis membrane is connected with the secondary reverse osmosis membrane so as to convey the pure water produced by the primary reverse osmosis membrane to the secondary reverse osmosis membrane, and the pure water output end of the secondary reverse osmosis membrane is connected with the electric desalting module so as to convey the pure water produced by the secondary reverse osmosis membrane to the electric desalting module;
the concentrated water output end of the secondary reverse osmosis membrane is connected to the raw water tank so as to return the produced concentrated water to the raw water tank for reuse; the concentrated water output end of the electric desalting module is connected to the raw water tank so as to return the produced concentrated water to the raw water tank for reuse;
the output end of the electric desalting module is divided into two paths, wherein one path is connected to the purified water tank so as to store the purified water reaching the standard into the purified water tank, and the other path is connected to the raw water tank so as to reflux the pure water which does not reach the standard into the raw water tank for recycling.
2. The recycling system in the production of purified water according to claim 1, wherein the output side of the electric desalting module is provided with a conductivity detection device, and the purified water produced by the electric desalting module is detected by the conductivity detection device, so as to selectively output two branches at the output end of the electric desalting module.
3. The recycling system in the production of purified water according to claim 1, wherein the pretreatment device comprises a raw water pump, a multi-media filter, a softener, an activated carbon filter and a cartridge filter which are connected in sequence through a pipeline, the raw water pump is used for providing power to pump raw water in a raw water tank to sequentially pass through the multi-media filter, the softener, the activated carbon filter and the cartridge filter, and the cartridge filter is connected to the first-stage reverse osmosis membrane.
4. The system of claim 3, wherein the demineralizer is further configured with a salt tank for adding brine to the demineralizer such that the ion exchange resin in the demineralizer is regenerated by adding salt.
5. The system of claim 4, wherein there are two sets of said softeners, said two sets of said softeners being connected in series, and said two sets of softeners sharing a common salt tank for brine filling.
6. The recycling system in the production of purified water according to claim 3, wherein a plate heat exchanger is arranged in a pipeline between the softener and the activated carbon filter, and the plate heat exchanger is used for externally connecting industrial steam to exchange heat with raw water conveyed to the front end of the activated carbon filter.
7. The recycling system in the production of purified water according to claim 1, wherein the input front end of the first reverse osmosis membrane is provided with a first-stage high-pressure pump, and the input front end of the second reverse osmosis membrane is provided with a second-stage high-pressure pump.
8. The recycling system of claim 1, wherein a pH adjuster is disposed in a pipe connecting the first reverse osmosis membrane and the second reverse osmosis membrane, the pH adjuster is configured to detect the pH of the pure water produced by the first reverse osmosis membrane, and add a pH adjusting agent to the pipe according to the detection result to adjust the pH of the pure water produced by the first reverse osmosis membrane.
9. The recycling system in the production of purified water according to claim 3, wherein the multi-media filter, the softener and the activated carbon filter each have a tank body, each tank body has a positive and negative flushing structure, each tank body is connected to the main pipeline on the output side of the raw water pump through the respective positive and negative flushing structure in sequence, raw water flows in the main pipeline in a single direction, and the raw water flowing in the single direction can flow through the tank bodies in the positive or negative direction through the positive and negative flushing structure;
the positive and negative flushing structure comprises a first automatic control valve, a second automatic control valve, a third automatic control valve, a fourth automatic control valve, a fifth automatic control valve, an upper connecting pipe, a lower connecting pipe and a sewage discharge pipe; the first automatic control valve and the second automatic control valve are sequentially connected in series in the main pipeline along the water flow direction, a pipe section between the first automatic control valve and the second automatic control valve is communicated with one end of a lower connecting pipe, and the other end of the lower connecting pipe is communicated with the bottom end of the tank body; one end of a third automatic control valve is connected with the main pipeline at the output end of the first automatic control valve, the other end of the third automatic control valve is connected with one end of an upper connecting pipe, and the other end of the upper connecting pipe is communicated with the top end of the tank body; the upper connecting pipe is communicated with a first branch communicated with the sewage discharge pipe, the fourth automatic control valve is arranged on the first branch, the lower connecting pipe is communicated with a second branch communicated with the sewage discharge pipe, and the fifth automatic control valve is arranged on the second branch.
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