CN115259574A

CN115259574A - Process for standard-reaching treatment of papermaking salt-containing membrane concentrated solution

Info

Publication number: CN115259574A
Application number: CN202211020545.XA
Authority: CN
Inventors: 陆曦; 申颖颖; 杨敏捷; 徐艳
Original assignee: Njtech Environment Technology Co ltd
Current assignee: Njtech Environment Technology Co ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-11-01

Abstract

The application relates to the technical field of sewage treatment, and particularly discloses a process for standard treatment of a papermaking salt-containing membrane concentrated solution. The process for standard-reaching treatment of the papermaking salt-containing membrane concentrated solution sequentially comprises three steps of primary oxidation, biochemical treatment and secondary oxidation, wherein organic matters which are difficult to biochemically treat and are remained in the papermaking salt-containing membrane concentrated solution are subjected to oxidation treatment through the primary oxidation, the organic matters which are difficult to biochemically treat are converted into organic matters which are easy to utilize by salt-tolerant microorganisms, and then the membrane concentrated solution is subjected to biochemical treatment through the salt-tolerant microorganisms, so that the COD (chemical oxygen demand) and TN (total nitrogen) values of the membrane concentrated solution are reduced, and finally, after the biochemical tail water is subjected to secondary oxidation, the water quality of effluent can reach the requirement of a first-level A discharge standard in pollutant discharge standards for municipal wastewater treatment (GB 18918-2002), and is directly discharged, so that the harmless treatment of the papermaking salt-containing membrane concentrated solution is realized.

Description

Process for standard-reaching treatment of papermaking salt-containing membrane concentrated solution

Technical Field

The application relates to the technical field of sewage treatment, in particular to a process for standard treatment of a papermaking salt-containing membrane concentrated solution.

Background

The paper industry is an industrial sector for the manufacture of various types of paper and board, and is characterized by the production of a membrane concentrate with complex composition and by the greater difficulty of its treatment. At present, most of treatment methods adopted by paper mills in treating salt-containing membrane concentrated solution for papermaking are combination of chemical methods and biological methods.

In the related art, a treatment process of a papermaking salt-containing membrane concentrated solution comprises the following steps: (1) Ultrafiltering the concentrated solution containing salt membrane for papermaking by using semipermeable membrane with pore diameter of 20-2000Ao (10-6.5-10-4.5 cm) to obtain purified solution and concentrated solution; (2) Performing reverse osmosis on the purified solution and the concentrated solution by using a semipermeable membrane with the aperture of 1-20Ao (10-7.5-10-6.5 cm) to obtain a secondary purified solution and a secondary concentrated solution; (3) And adding sewage treatment bacteria into the secondary concentrated solution, and standing to obtain biochemical treatment tail water.

In view of the above-mentioned related technologies, the inventor believes that, after ultrafiltration and reverse osmosis are performed in the related technologies, the salt concentration of the obtained secondary concentrated solution is too high, and most of the organics which are easy to be degraded by biochemical treatment are removed in the pre-membrane biochemical treatment process, so that the sewage treatment bacteria are difficult to grow in the secondary concentrated solution, and the treatment effect on the secondary concentrated solution is affected.

Disclosure of Invention

In the related art, the sewage treatment bacteria are difficult to grow in the secondary concentrated solution, and the treatment effect on the secondary concentrated solution is influenced. In order to overcome the defect, the application provides a process for standard treatment of the salt-containing membrane concentrated solution for papermaking.

The application provides a technology of standard treatment of papermaking salt-containing membrane concentrated solution, adopts the following technical scheme:

a process for standard treatment of a papermaking salt-containing membrane concentrated solution comprises the following steps:

(1) Primary oxidation: carrying out electrocatalytic oxidation and chemical catalytic oxidation on the papermaking salt-containing membrane concentrated solution to obtain a pre-oxidation membrane concentrated solution; the total concentration of chloride and sulfate in the concentrated solution of the salt-containing membrane for papermaking is 15000-30000mg/L; the papermaking salt-containing membrane concentrated solution is obtained by performing ultrafiltration and reverse osmosis treatment on the sewage after standard treatment of a sewage plant, wherein the total nitrogen in the papermaking salt-containing membrane concentrated solution is 70-200mg/L, and the COD content in the papermaking salt-containing membrane concentrated solution is 100-400mg/L;

(2) Biochemical treatment: introducing the pre-oxidation film concentrated solution into a high-salt biochemical reactor, adding salt-tolerant microbes and biological fillers into the reactor, and sequentially performing anoxic treatment and aerobic treatment to obtain biochemical treatment tail water;

(3) Secondary oxidation: removing suspended matters in the biochemical treatment tail water through coagulating sedimentation treatment, collecting supernatant of the biochemical treatment tail water, adding a cocatalyst into the supernatant, and then performing ozone oxidation treatment until the supernatant reaches the standard and discharging.

By adopting the technical scheme, the application combines electrocatalysis and chemical catalytic oxidation, and oxidizes organic matters which are difficult to be directly utilized by salt-tolerant microorganisms, such as lignin, aromatic hydrocarbon, aldehyde, ketone and the like, into organic matters which are easy to be biochemically degraded, and simultaneously generates carbon dioxide and water. Salt-tolerant microorganisms can still normally grow in the environment with the total salt concentration of 15000-30000mg/L, and the salt-tolerant microorganisms can degrade nitrogen-containing pollutants in the membrane concentrated solution while utilizing the easily biodegradable organic matters generated after oxidation, so that the COD content and TN content in the finally discharged supernatant are reduced, and the treatment effect on the papermaking salt-containing membrane concentrated solution is improved.

The high-efficiency catalytic oxidation reaction system is rich in particles such as electrons, ions, free radicals, metastable molecules, active intermediate coordination compounds, active free radicals and the like, the dynamic reaction rate is high, the degradation reaction activity is high, the biodegradability of the membrane concentrated solution is effectively improved, the biochemical load is reduced, the process is clean, and no secondary pollution is caused.

Preferably, the cocatalyst is hydrogen peroxide solution with mass concentration of 25-30%.

By adopting the technical scheme, hydrogen peroxide can be subjected to homolytic cracking under the combined action of ozone and a solid catalyst during secondary oxidation to generate hydroxyl free radicals, and when the mass concentration of the hydrogen peroxide in the hydrogen peroxide solution is 25-30%, the COD content in the finally discharged supernatant is reduced.

Preferably, in the secondary oxidation step, the addition amount of the promoter is 0.05-0.5 per mill of the total volume of the membrane concentrated solution.

By adopting the technical scheme, when the addition amount of the cocatalyst is 0.05-0.5 per mill of the total volume of the membrane concentrated solution, the oxidation effect of hydroxyl radicals on refractory organic matters is moderate, and the reduction of COD content in the finally discharged supernatant is facilitated.

Preferably, the papermaking comprises BOD of the salt membrane concentrated solution ₅ The value of the/COD is between 0.10 and 0.20.

By adopting the technical scheme, when papermaking contains BOD of salt membrane concentrated solution ₅ When the COD value is lower than 30 percent, the membrane concentrated solution can not be directly biochemically degraded by salt-tolerant microorganisms. After the primary oxidation, the total amount of organic matters which can be directly utilized by salt-tolerant microorganisms is increased, so that biochemical treatment is indirectly carried out on concentrated solution which is not biochemically degradable.

Preferably, BOD in the pre-oxidized membrane concentrated solution ₅ The value of the/COD is between 0.30 and 0.40.

By adopting the technical scheme, after primary oxidation, most of the original organic matters which are difficult to be biochemically degraded in the papermaking salt-containing membrane concentrated solution are converted into biochemically degradable organic matters, and BOD (biochemical oxygen demand) in the obtained preoxidation membrane concentrated solution ₅ The value of/COD is 0.30-0.40, thereby providing enough carbon source, promoting the growth and the propagation of the salt-tolerant microorganisms and improving the treatment effect on the concentrated solution of the salt-containing membrane for papermaking.

Preferably, the membrane concentrate has a pH of 7 to 8.

By adopting the technical scheme, the membrane concentrated solution is neutral or weakly alkaline, and under the condition, the growth and the reproduction of salt-tolerant microorganisms are inhibited less, so that the biochemical treatment effect on the membrane concentrated solution is better, and the COD content and the TN content in the finally discharged supernatant can be reduced.

Preferably, in the biochemical treatment step, a carbon source is also fed into the high-salt biochemical reactor.

By adopting the technical scheme, the degradable COD content in the pre-oxidation film concentrated solution can be increased by adding the carbon source, the growth and the propagation of the salt-tolerant microorganisms are promoted, and the biochemical degradation effect of the salt-tolerant microorganisms on the pre-oxidation film concentrated solution is improved.

Preferably, in the biochemical treatment step, the carbon source is fed at least twice, and after all the carbon source is fed into the high-salt biochemical reactor, the COD/TN value in the membrane concentrated solution is (4-5): 1.

by adopting the technical scheme, when the COD content of the membrane concentrated solution in the biochemical treatment step is low, the utilization of the salt-tolerant microorganisms to nitrogen is influenced, so that the total nitrogen content in the discharged supernatant is high. When the membrane concentrate in the biochemical treatment step has a high COD content, more COD is likely to remain in the discharged supernatant. The COD/TN value of the membrane concentrated solution in the biochemical treatment step is maintained at (4-5) by feeding carbon sources twice or more: 1, which helps to maintain the carbon-nitrogen ratio in the membrane concentrate in balance.

In summary, the present application has the following beneficial effects:

1. the process carries out oxidation treatment on residual organic matters which are difficult to carry out biochemical treatment in the papermaking salt-containing membrane concentrated solution through primary oxidation, the organic matters which are difficult to carry out biochemical treatment are converted into organic matters which are easy to be utilized by salt-resistant microorganisms, and then the membrane concentrated solution is subjected to biochemical treatment through the salt-resistant microorganisms, so that the COD (chemical oxygen demand) and TN (total nitrogen) values of the membrane concentrated solution are reduced, biochemical tail water is subjected to secondary oxidation, oxidized water can directly reach the standard and be discharged, and harmless treatment on the papermaking salt-containing membrane concentrated solution is realized.

2. BOD of salt-containing membrane concentrate for papermaking is preferred in the present application ₅ The COD value is 0.10-0.20,not only realizes the treatment of the membrane concentrated solution which can be treated biochemically in the traditional sense, but also can lead the BOD in the membrane concentrated solution to be treated by primary oxidation ₅ The ratio of COD is increased, so that the biochemical treatment is indirectly carried out on the concentrated solution which is not biochemically degradable.

3. According to the method, the COD/TN value in the membrane concentrated solution is maintained at (4-5) in the biochemical treatment process by adding the carbon source in batches: 1, the possibility of COD exceeding is reduced while TN is reduced.

Detailed Description

The present application will be described in further detail with reference to examples, preparations and comparative examples, and all of the starting materials mentioned in the present application are commercially available.

Examples

Examples 1 to 5

The following description will be given by taking example 1 as an example.

Example 1

The concentrated solution of the salt-containing membrane for papermaking selected in this embodiment is obtained by performing ultrafiltration treatment and reverse osmosis treatment on the concentrated solution of the salt-containing membrane for papermaking, and in the concentrated solution of the salt-containing membrane for papermaking, the total concentration of chloride and sulfate is 15000mg/L, the COD content is 200mg/L, and BOD ₅ The value of/COD was 0.08 and the pH was 6.5.

The embodiment provides a process for standard treatment of a papermaking salt-containing membrane concentrated solution, which comprises the following steps:

(1) Primary oxidation: carrying out chemical catalytic oxidation on the papermaking salt-containing membrane concentrated solution to obtain a pre-oxidation membrane concentrated solution;

(2) Biochemical treatment: introducing the pre-oxidation film concentrated solution into a high-salt biochemical reactor, adding salt-tolerant microorganisms and biological fillers into the reactor, and performing anoxic treatment for 1d and aerobic treatment for 1.5d to obtain biochemical treatment tail water; in the step, the salt-tolerant microorganism is a CD2 salt-tolerant composite strain provided by Haicheng biotechnology Limited company in Yangzhou city, the biological filler is a black polyurethane sponge biological filler sold in the market, and the density of the biological filler is 1g/cm3;

(3) Secondary oxidation: adding a coagulant and a coagulant aid into the biochemical treatment tail water, removing suspended matters in the biochemical treatment tail water through coagulating sedimentation, collecting supernatant of the biochemical treatment tail water, adding a cocatalyst into the supernatant, and performing ozone oxidation reaction for 30min to obtain oxidized effluent which can directly reach the standard and be discharged; in the step, the coagulant is polyaluminium chloride, the coagulant aid is anionic polyacrylamide, the dosage of ozone in each liter of supernatant is 90mg, the solid catalyst is LCO ozone catalyst, the dosage of the solid catalyst in each liter of supernatant is 20mg, the cocatalyst is hydrogen peroxide solution with mass concentration of 22.5%, and the dosage of the hydrogen peroxide solution is 0.05 per thousand of the total volume of the supernatant.

As shown in Table 1, examples 1 to 5 differ mainly in the total concentration of chloride and sulfate

TABLE 1

Sample(s)	Example 1	Example 2	Example 3	Example 4	Example 5
						Total concentration of chloride and sulfate/(mg/L)	15000	18000	22000	26000	30000

Examples 6 to 9

As shown in table 2, examples 6-9 differ from example 3 in the mass fraction of hydrogen peroxide in the hydrogen peroxide solution.

TABLE 2

Sample(s)	Example 3	Example 6	Example 7	Example 8	Example 9
						Mass fraction of hydrogen peroxide/%)	22.5	25	27.5	30	32.5

Examples 10 to 13

Examples 10-13 differ from example 7 in the ratio of the volume of promoter added in the secondary oxidation step to the total volume of the membrane concentrate, as shown in table 3.

TABLE 3

Sample(s)	Example 7	Example 10	Example 11	Example 12	Example 13
						Addition ratio/% o	0.05	0.25	0.50	0.75	1.00

Examples 14 to 17

As shown in table 4, examples 14 to 17 are different from example 11 in the COD content in the papermaking salt-containing membrane concentrate.

TABLE 4

Sample(s)	Example 11	Example 14	Example 15	Example 16	Example 17
						COD content/% o	400	300	200	150	100

Examples 18 to 21

As shown in Table 5, examples 18 to 21 differ from example 15 in the BOD of the salt-containing membrane concentrate for papermaking ₅ Different in COD value.

TABLE 5

Sample(s)	Example 15	Example 18	Example 19	Example 20	Example 21
						BOD5/COD	0.08	0.10	0.15	0.20	0.24

Examples 22 to 25

As shown in table 6, examples 22 to 25 differ from example 15 in the total nitrogen concentration (TN) in the papermaking salt-containing membrane concentrate.

TABLE 6

Sample(s)	Example 15	Example 22	Example 23	Example 24	Example 25
						TN/(mg/L)	200	170	140	110	70

Examples 26 to 29

As shown in table 7, examples 26 to 29 are different from example 15 in the pH of the membrane concentrate.

TABLE 7

Sample(s)	Example 15	Example 26	Example 27	Example 28	Example 29
						pH	6.5	7.0	7.5	8.0	8.5

Example 30

As shown in Table 8, example 30 differs from example 27 in that in the biochemical treatment step, carbon source is further fed into the high-salt biochemical reactor until the COD/TN in the membrane concentrate in the reactor reaches a value of 3:1, the carbon source is glucose.

Example 31

The present example is different from example 30 in that in the biochemical treatment step, the carbon source is added in two times, and the starting time points of the two times of adding are the starting time points of the anoxic treatment and the aerobic treatment, respectively.

Examples 32 to 35

As shown in Table 8, examples 32 to 35 differ from example 31 in the COD/TN values in the membrane concentrate at the end of carbon source addition in the biochemical treatment step.

TABLE 8

Sample(s)	Example 31	Example 32	Example 33	Example 34	Example 35
						COD/TN	3:1	3.5:1	4:1	4.5:1	5:1

Comparative example

Comparative example 1

A treatment process of a papermaking salt-containing membrane concentrated solution comprises the following steps:

(1) Ultrafiltering the concentrated solution containing salt membrane for papermaking by using semipermeable membrane with pore diameter of 20-2000Ao (10-6.5-10-4.5 cm) to obtain purified solution and concentrated solution;

(2) Performing reverse osmosis on the purified solution and the concentrated solution by using a semipermeable membrane with the aperture of 1-20Ao (10-7.5-10-6.5 cm) to obtain a secondary purified solution and a secondary concentrated solution;

(3) Adding sewage treatment bacteria and biological filler into the secondary concentrated solution, and performing anaerobic treatment for 1d and aerobic treatment for 1.5d to obtain biochemical treatment tail water; in the step, the salt-tolerant microorganism is a CD2 salt-tolerant composite strain provided by Haicheng biotechnology Limited company in Yangzhou city, the biological filler is a black polyurethane sponge biological filler sold in the market, and the density of the biological filler is 1g/cm < 3 >.

Comparative example 2

The comparative example is different from example 3 in that the biochemical treatment is directly performed on the papermaking salt-containing membrane concentrated solution by skipping the primary oxidation, and then the oxidation treatment is performed with reference to the secondary oxidation.

Comparative example 3

The difference between the comparative example and the example 3 is that the salt-tolerant microbes are replaced by non-salt-tolerant microbes which are KBY-023 type river channel treatment microbial inoculum provided by Beijing Kebi environmental engineering Limited.

Comparative example 4

This comparative example is different from example 3 in that the biochemical treatment step is not included, but the primary oxidation and the secondary oxidation treatment are sequentially performed on the salt-containing membrane concentrate for papermaking.

Comparative example 5

The comparative example is different from example 30 in that in the secondary oxidation step, ozone and a promoter were not added to the supernatant, and the supernatant was left to stand for 30min and then discharged.

Performance detection test method

1. Detection of integrated treatment effects

The detection method comprises the following steps:

(1) Determining COD of the concentrated solution of the salt-containing membrane for papermaking selected in the step (1) according to GB/T11914-1989 to obtain an initial value of the COD; determining TN of the papermaking salt-containing membrane concentrated solution selected in the step (1) by referring to GB/T11894-1989 to obtain an initial value of TN;

(2) And (4) measuring COD and TN of the supernatant subjected to the peroxidation treatment in the step (3) to obtain discharge values of the COD and the TN, and then calculating the removal rates of the COD and the TN according to the initial values and the discharge values, wherein the calculation results are shown in a table 9.

The calculation formula of the removal rate is as follows:

2. BOD ₅ Determination of the COD value

BOD of salt-containing membrane concentrate for paper making in example 15, examples 18-21 ₅ The COD value is recorded as L1, and then the BOD of the pre-oxidized membrane concentrated solution is determined ₅ The value of/COD, denoted L2, BOD ₅ The results of L1 and L2 measurements are shown in Table 10, in reference to GB/T11914-1989.

TABLE 9

Watch 10

Sample(s)	L1	L2
			Example 15	0.08	0.42
Example 18	0.10	0.40
			Example 19	0.15	0.35
Example 20	0.20	0.30
			Example 21	0.24	0.28

As can be seen by combining examples 1-5 and comparative example 1 with Table 9, the COD removal rate and TN removal rate measured in examples 1-5 are higher than that in comparative example 1, which shows that the salt-tolerant microorganisms used in the present application can normally grow in the environment with high salt concentration, and the primary oxidation step increases the total amount of organics which are easily degraded and degraded in the membrane concentrate. The salt-tolerant microorganisms degrade the nitrogen-containing pollutants in the membrane concentrated solution while utilizing the organics which are easy to be biodegraded to grow and propagate, and finally reduce the COD content and TN content in the finally discharged supernatant, thereby improving the treatment effect on the papermaking salt-containing membrane concentrated solution.

It can be seen by combining example 3 and comparative example 2 and table 9 that the COD removal rate and the TN removal rate measured in example 3 are both higher than those in comparative example 2, which indicates that in the case of not having undergone the primary oxidation, the treatment effect of the salt-tolerant microorganisms on the membrane concentrate is not good because the organic matters directly available for the salt-tolerant microorganisms in the membrane concentrate treated by the present application are insufficient, and the COD removal rate and the TN removal rate are both reduced compared with example 3.

As can be seen by combining example 3 and comparative example 3 with table 9, the COD removal rate and TN removal rate measured in example 3 were both higher than in comparative example 3, indicating that the growth and propagation of non-salt-tolerant microorganisms were hindered at high salt concentration, and thus were difficult to survive in the membrane concentrate of the present application.

As can be seen by combining comparative example 3 and comparative example 4 and table 9, the removal rate of COD and the removal rate of TN measured in comparative example 3 are only slightly higher than that in comparative example 4, which indicates that the removal effect of the non-salt-tolerant microorganisms in comparative example 3 on COD and TN is severely inhibited, resulting in poor treatment effect.

It can be seen from the combination of example 3 and examples 6-9 and table 9 that the COD removal rate and TN removal rate measured in examples 6-8 are higher than those in examples 3 and 9, which indicates that when the hydrogen peroxide solution is added in an amount of 0.05% of the total volume of the supernatant, the hydrogen peroxide concentration in the hydrogen peroxide solution is between 25% and 30% which is more beneficial to improving the treatment effect on the saline membrane concentrate for papermaking, and the treatment effect is relatively better when the hydrogen peroxide concentration is 27.5%.

As can be seen by combining examples 7, 10-13 and Table 9, the COD removal rate and TN removal rate measured in examples 7, 10 and 11 were relatively high, while the values measured in examples 12-13 were relatively low, indicating that the treatment effect on the membrane concentrate was better when the amount of hydrogen peroxide added was between 0.05 and 0.5% o of the total volume of the membrane concentrate for a hydrogen peroxide solution with a hydrogen peroxide concentration of 27.5%.

When the COD content in the membrane concentrate is in the range of 100-400mg/L, the treatment effect on the membrane concentrate is better by combining the examples 11 and 14-17 and combining the table 9.

As can be seen by combining examples 15, 18-21 and tables 9-10, the following BOD is observed ₅ The COD ratio is increased, the COD removal rate and the TN removal rate are both reduced, which shows that in the membrane concentrated solution, the original easily-degradable organic matters are easily oxidized and lost in the primary oxidation step, and the difficultly-degradable organic matters are converted into new easily-degradable organic matters after primary oxidation, so that the initial content of the difficultly-degradable organic matters is higher, the degradable organic matters in the membrane concentrated solution obtained after primary oxidation are more, and the removal rates of the COD and the TN are more favorably improved.

When the TN value is between 70 and 200mg/L, the treatment effect on the membrane concentrate is better as can be seen by combining the examples 15 and 22 to 25 and combining the table 9.

When the pH of the membrane concentrate is in the range of 7 to 8, the treatment effect of the salt-tolerant microorganisms on the membrane concentrate is better, and the COD removal rate and the TN removal rate are improved as can be seen by combining the examples 15 and 26 to 29 and combining the table 9.

In example 30, after the carbon source is added in the biochemical treatment process, the content of the degradable organic matters is increased, the growth and the propagation of the salt-tolerant microorganisms are promoted, and the removal effect on COD and TN is enhanced as can be seen by combining example 27 and example 30 in Table 9. Meanwhile, redundant organic matters can be oxidized and removed in the secondary oxidation process, so that the possibility of increasing COD in discharged supernatant liquid caused by adding carbon sources is reduced.

When the carbon source is added in the biochemical treatment step and the secondary oxidation treatment is not performed, the COD content in the finally obtained membrane concentrate is higher, which can be seen by combining comparative example 5 and example 30, and table 9, which indicates that the COD content in the discharged membrane concentrate is increased by adding the carbon source if the secondary oxidation treatment is not performed.

As can be seen by combining examples 30-31 with Table 9, the split dosing of carbon source helps to remove COD and TN from the membrane concentrate. As can be seen from the combination of examples 31 to 35 and Table 9, when the carbon source is fed, the COD/TN value in the membrane concentrate is adjusted to (4-5): 1, the process of the present application more readily removes TN in the membrane concentrate.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A process for standard treatment of a papermaking salt-containing membrane concentrated solution is characterized by comprising the following steps:

(2) Biochemical treatment: introducing the pre-oxidation film concentrated solution into a high-salinity biochemical reactor, adding salt-tolerant microorganisms and biological fillers into the reactor, and sequentially performing anoxic treatment and aerobic treatment to obtain biochemical treatment tail water;

(3) Secondary oxidation: removing suspended matters in the biochemical treatment tail water through coagulating sedimentation treatment, then collecting supernatant of the biochemical treatment tail water, adding a cocatalyst into the supernatant, and then performing ozone oxidation treatment until the supernatant reaches the standard and discharging.

2. The process for treating the concentrated solution of the salt-containing membrane for papermaking according to claim 1, wherein the promoter is hydrogen peroxide solution with mass concentration of 25-30%.

3. The process for treating the salt-containing membrane concentrate for papermaking according to claim 2, wherein in the secondary oxidation step, the addition amount of the promoter is 0.05-0.5 per mill of the total volume of the membrane concentrate.

4. The process for performing standard treatment on the papermaking salt-containing membrane concentrate according to claim 1, wherein the value of BOD5/COD of the papermaking salt-containing membrane concentrate is 0.10-0.20.

5. The process for performing standard treatment on the papermaking salt-containing membrane concentrated solution according to claim 4, wherein the value of BOD5/COD in the pre-oxidation membrane concentrated solution is 0.30-0.40.

6. The process for making the saline membrane concentrate of paper according to claim 1, wherein the pH of the membrane concentrate is 7-8.

7. The process for treating the concentrated solution of the salt-containing membrane for papermaking according to claim 1, wherein in the step of biochemical treatment, a carbon source is also added into the high-salt biochemical reactor.

8. The process for treating the salt-containing membrane concentrate for paper making according to claim 7, wherein in the step of biochemical treatment, the carbon source is added at least twice, and after all the carbon source is added into the high-salt biochemical reactor, the COD/TN value in the membrane concentrate is (4-5): 1.