CN108341556A - A kind of advanced treatment of wastewater and the system and method for acid-basic regenerated waste liquids in water reuse - Google Patents

Abstract

The invention discloses a kind of advanced treatment of wastewater and the system and method for acid-basic regenerated waste liquids in water reuse, system includes biochemistry pool, sedimentation basin, Powdered Activated Carbon membrane bioreactor, resin container, waste collection pond, denitrification pond, nitrification tank, sludge concentration tank；Sewage plant water inlet enters biochemistry pool after pretreatment, by the effect degradation CODcr of activated sludge, supernatant flows into Powdered Activated Carbon membrane bioreactor after sedimentation, and pollutant is further adsorbed by Powdered Activated Carbon, utilize the retention of membrane module, removal coloration, suspended matter, CODcr；Resin container is sent into film water outlet, by the suction-operated of obligate nitrate ion exchanger resin, removes the nitrate in sewage, water purification direct emission；Acid-basic regenerated waste liquids in water flows into waste collection pond, is sent into denitrification pond denitrogenation, and denitrification water outlet flows into nitrification tank and carries out nitration reaction, reduce ammonia nitrogen and the CODcr that degrades, nitrification liquid is back to denitrification pond, and final nitrification tank water outlet is all back to front end biochemistry pool, realizes the reuse of acid-basic regenerated waste liquids in water.

Description

A system and method for advanced sewage treatment and reuse of resin regeneration waste liquid

technical field

The invention belongs to the technical field of sewage treatment, and relates to a system and method for recycling waste liquid, in particular to a system and method for advanced sewage treatment and resin regeneration waste liquid reuse.

Background technique

With the development of urban construction and industry, the amount of domestic sewage and industrial wastewater is also increasing. Most of the sewage treatment plants in my country routinely use biochemical processes to treat sewage. Although the effluent can reach the first-class A or first-class B standard, the residual pollutants in the tail water such as COD, BOD, SS, ammonia nitrogen, total nitrogen (TN), and total Phosphorus (TP) and other trace pollutants have great hidden dangers to human health and the surrounding environment. In order to eliminate these pollutants to the greatest extent, and in response to the more stringent sewage discharge policy issued by the country, it is urgent to research and develop corresponding advanced water treatment processes on the basis of seeking economic optimization.

At present, for the advanced treatment process of municipal sewage plants, there are mainly biochemical methods for COD removal: wetlands, oxidation ponds, physical methods: microfiltration, ultrafiltration, nanofiltration, reverse osmosis, activated carbon adsorption; biochemical methods for TN removal: denitrification, Chemical methods: electrolysis, redox; physical adsorption: macroporous denitrification resin; biochemical methods for ammonia nitrogen removal: contact oxidation, activated sludge, etc.

Biochemical denitrification has the problem of insufficient carbon source, and must ensure a long enough hydraulic retention time to achieve the effect of removing ammonia nitrogen, and the biochemical treatment method occupies a large area, which is not suitable for systems with strict land use restrictions on site; Filtration can effectively remove SS, but it is difficult to reduce COD only by microfiltration and ultrafiltration, and the cost of nanofiltration or reverse osmosis is high; activated carbon can effectively absorb organic pollutants in wastewater and meet the COD discharge requirements, but Large-scale use will face regeneration and disposal problems. Redox denitrification will produce by-products, which may cause secondary pollution; electrolytic denitrification has problems such as low denitrification efficiency and high energy consumption.

The powder activated carbon membrane bioreactor, which is gradually developing at this stage, integrates the functions of activated carbon adsorption, biological activated carbon, microbial biochemical degradation, aeration and oxygenation, and membrane separation in the reactor, which can remove COD, ammonia nitrogen, colloid and suspended solids. The macroporous denitrification resin adsorption method has mature technology, high denitrification efficiency, and high degree of automatic operation, but the saturated resin needs to be regenerated regularly, and the regeneration waste liquid contains relatively high concentrations of chloride ions and nitrate ions. The environment causes secondary pollution. If the disposal problem of resin regeneration waste liquid cannot be effectively solved, it will be difficult to popularize and apply the macroporous denitrification resin adsorption method in the field of sewage denitrification.

Contents of the invention

In order to solve the above technical problems, the present invention provides a system and method for advanced sewage treatment and resin regeneration waste liquid reuse.

The technical scheme adopted by the system of the present invention is: a system for advanced sewage treatment and resin regeneration waste liquid reuse, which is characterized in that it includes a biochemical tank, a sedimentation tank, a powdered activated carbon membrane bioreactor, a resin tank, and waste liquid collection pool, denitrification pool, nitrification pool, sludge thickening pool;

After the influent water of the sewage plant is pretreated, it first enters the biochemical tank, and the pollutants are degraded by the action of microorganisms in the activated sludge. Enter the powder activated carbon membrane bioreactor, add a certain amount of powder activated carbon, and further absorb refractory pollutants and chromatic substances. In the sludge concentration tank, the effluent flows into the resin tank, and through the action of the specific nitrate ion exchange resin, the nitrate in the sewage is removed, the total nitrogen in the effluent is reduced, and the effluent reaches the standard discharge to realize the advanced treatment of sewage;

After the resin in the resin tank is saturated with adsorption, it needs to be regenerated with sodium chloride solution, and the waste liquid formed is collected in the waste liquid collection pool, and then enters the denitrification pool for denitrification, and denitrification is carried out under anoxic conditions. The nitrate nitrogen in the waste liquid is removed by bacteria, and the effluent enters the nitrification tank, and the nitrification reaction occurs through the action of nitrifying bacteria under aerobic conditions, further reducing the content of ammonia nitrogen and CODcr, and the effluent mixture of the nitrification tank first flows back to the In the denitrification tank, the mud-water mixture that finally flows out of the nitrification tank is all returned to the biochemical tank, realizing the reuse of the resin regeneration waste liquid.

The technical solution adopted in the method is: a method for advanced sewage treatment and resin regeneration waste liquid reuse, which is characterized in that it includes the following steps:

Step 1: The pretreatment effluent of the sewage plant is used as the system inlet water, first enters the biochemical tank, and degrades pollutants through the action of microorganisms in the activated sludge. The mud-water mixture is separated from the solid and liquid in the sedimentation tank, and the sludge is discharged to the sludge concentration tank. The effluent enters the powdered activated carbon membrane bioreactor;

Step 2: Add a certain proportion of powdered activated carbon to the powdered activated carbon membrane bioreactor to further absorb refractory pollutants and chromatic substances. The activated carbon slurry circulates and accumulates in the powdered activated carbon membrane bioreactor, and is regularly discharged to the sludge Concentration tank, the effluent flows into the resin tank;

Step 3: The sewage flows through the resin tank, and through the action of the specific nitrate ion exchange resin, the nitrate in the sewage is removed, the total nitrogen in the effluent is reduced, and the effluent meets the discharge standard;

Step 4: The adsorbed saturated resin is desorbed and regenerated with 4.0% to 5.0% NaCl solution, and the waste liquid formed by regeneration is collected into the waste liquid collection pool, and then enters the denitrification pool for denitrification, and carbon is added under anoxic conditions. Source, remove the nitrate nitrogen in the waste liquid through the action of denitrifying bacteria, convert it into N ₂ for removal, and the effluent enters the nitrification tank;

Step 5: In the nitrification tank, under aerobic conditions, the nitrification reaction occurs through the action of nitrifying bacteria to further reduce the content of ammonia nitrogen and CODcr. The primary chemical pool realizes the reuse of resin regeneration waste liquid.

The method of the present invention has the following characteristics and beneficial effects: the advanced treatment of sewage is carried out by using the combination of "biochemical method", "powder activated carbon", "ultrafiltration membrane method" and "resin adsorption method". , through a large amount of aeration, powdered activated carbon can effectively adsorb refractory organic pollutants and chromatic substances, and reduce ammonia nitrogen, and filter through submerged ultrafiltration membrane modules to intercept all activated carbon powder, suspended solids, colloids, etc., for effluent COD , ammonia nitrogen, chroma, and turbidity are significantly removed; at the same time, because some microorganisms can enter the micropores inside the activated carbon, the dissolved oxygen in the internal pores is insufficient to form an anoxic environment, which has a certain denitrification effect, so the powder activated carbon membrane bioreactor is also It has a certain nitrate nitrogen removal function; the resin adsorption ion exchange denitrification method has the advantages of mature technology, simple equipment, convenient operation and management, high degree of nitrate removal, and low operating cost. Compared with the prior art, the present invention has the advantages of The nitrate selective ion exchange resin used is a specific nitrate resin with stable performance, can reduce the competitive adsorption of sulfate ions, is resistant to organic pollution, and has high denitrification efficiency. It can be desorbed and regenerated with ordinary salt water and repeated. Use; adopt the method of "denitrification method - nitrification method - return to the original chemical tank" to treat and reuse the regeneration waste liquid, and add activated sludge successfully cultivated and domesticated under high salinity in the denitrification tank and nitrification tank, Even if the sodium chloride content in the inflowing regeneration waste liquid is relatively high, the denitrifying bacteria and nitrifying bacteria can still ensure high biological activity within a certain salinity range (sodium chloride content is not more than 5%), and are effective against nitrate nitrogen, The removal effect of ammonia nitrogen, CODcr and other indicators is remarkable. The conversion product _N2 of nitrate nitrogen denitrification is directly discharged to the atmosphere, and the effluent is returned to the primary chemical tank to make it fully reused. The entire resin regeneration waste liquid treatment process does not produce any pollution. expulsion of things. The whole system has the advantages of stable effluent quality, small footprint, high denitrification efficiency, low effluent suspended solids, and less sludge volume, etc., and the effluent can stably meet Class III to Class IV of the "Environmental Quality Standard for Surface Water" (GB3838-2002) standard.

Description of drawings

Fig. 1: system structural diagram of the embodiment of the present invention;

Fig. 2: Method flow chart of an embodiment of the present invention.

In the figure, 1. Biochemical tank, 2. Sedimentation tank, 3. Powdered activated carbon membrane bioreactor, 4. Resin tank, 5. Waste liquid collection tank, 6. Denitrification tank, 7. Nitrification tank, 8. Sludge concentration Pool, 9. Carbon source tank, 10. Powder activated carbon dosing device, 11. Microporous aeration device, 12. Fan.

Detailed ways

In order to facilitate those skilled in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Please see Figure 1, a system for advanced sewage treatment and resin regeneration waste liquid reuse provided by the present invention, including a biochemical tank 1, a sedimentation tank 2, a powdered activated carbon membrane bioreactor 3, a resin tank 4, and a waste liquid collection tank 5 , denitrification pool 6, nitrification pool 7, sludge concentration pool 8;

After the influent water of the sewage plant is pretreated, it first enters the biochemical pool 1, and the pollutants are degraded by the action of microorganisms in the activated sludge. Activated carbon membrane bioreactor 3, add 30-50mg/L powdered activated carbon to further absorb refractory pollutants and chromatic substances. Concentration tank 8, the effluent flows into the resin tank 4, through the action of the specific nitrate ion exchange resin, the nitrate in the sewage is removed, the total nitrogen in the effluent is reduced, and the effluent reaches the standard discharge to realize the advanced treatment of sewage;

Powdered activated carbon membrane bioreactor 3 needs regular backwashing and chemical cleaning, the frequency of backwashing is once every 10-15 minutes, and the frequency of chemical cleaning is once every 1-2 months;

Resin in the resin tank 4 needs to be regenerated with sodium chloride solution after adsorption and saturation. The waste liquid formed by resin regeneration has a sodium chloride content of 1.5% to 2.5%, a nitrate nitrogen content of 650 to 800 mg/L, and the waste liquid is collected in a concentrated manner. Waste liquid collection tank 5, then enters denitrification tank 6 for denitrification, and add carbon source, carbon source conversion COD amount is 3 to 4 times of nitrate concentration in denitrification tank 7, dissolved oxygen content is controlled at 0.5- 1.0mg/L, the sludge concentration is 3000-5000mg/L, under anoxic conditions, the denitrification bacteria in the activated sludge flora that have been successfully domesticated at a certain salinity are used to remove the nitrate in the waste liquid Nitrogen, the effluent enters the nitrification tank 7, the dissolved oxygen content is controlled at 2.0-4.0mg/L, the sludge concentration is 3000-5000mg/L, and the activated sewage that has been successfully domesticated at a certain salinity is passed through under aerobic conditions. The nitrifying bacteria in the mud flora act on the nitrification reaction to further reduce the content of ammonia nitrogen and CODcr. The mixed solution of the effluent from the nitrification tank 7 first flows back to the denitrification tank 6, and the final mud-water mixture from the nitrification tank 7 flows back to the biochemical tank 1 to realize Reuse of resin regeneration waste liquid.

The powdered activated carbon membrane bioreactor 3 of this embodiment is equipped with a submerged ultrafiltration membrane module, the membrane material is PVC hollow fiber membrane, the filtration accuracy: 0.001-0.02 μm, the filtration method: internal pressure type, and the turbidity of the produced water is <0.1 NTU, maximum water inlet pressure: 0.45MPa, a certain amount of powdered activated carbon is added to the powdered activated carbon membrane bioreactor 3 to absorb refractory pollutants and chromatic substances, and the activated carbon powder is intercepted by submerged ultrafiltration membrane modules. Reduce effluent CODcr, chroma, suspended solids and colloids.

The obligatory nitrate ion exchange resin filled in the resin tank 4 of the present embodiment is a macroporous anion nitrate ion resin, the appearance form is a spherical particle, the skeleton is polyethylene-divinylbenzene, and the functional group is a quaternary ammonium group. The range is 300-1200μm, the total exchange capacity is greater than 900mol/m3, the water content is 50-56%, and the loading density is 675-720g/l.

Present embodiment is also equipped with carbon source tank 9 and powdered activated carbon dosing device 10, is used for adding carbon source in denitrification pond 6 and in powder activated carbon membrane bioreactor 3, adds powdered activated carbon; Denitrification pond 6 and Microporous aeration devices 11 are provided in the nitrification tanks 7, and oxygen is supplied by fans 12, and activated sludge successfully domesticated through high salinity is put in.

Both the biochemical pool 1 and the powdered activated carbon membrane bioreactor 3 are equipped with an aeration device, which is aerated by a fan.

The system of this embodiment can realize PLC automatic control.

The present invention adopts the combination of "biochemical method", "powder activated carbon", "ultrafiltration membrane method" and "resin adsorption method" to carry out advanced treatment of sewage, and adopts "denitrification method-nitration method-backflow to the primary chemical tank" The treatment and reuse of resin regeneration waste liquid are carried out in a combined manner. The specific technical principles are as follows:

After pretreatment, the influent water of the sewage plant first enters the biochemical tank, degrades the pollutants through the action of microorganisms in the activated sludge in the tank, and separates the mud and water through the sedimentation tank to reduce the CODcr and ammonia nitrogen content of the effluent, and flows into the powdered activated carbon membrane bioreactor. Add powdered activated carbon, through a large amount of aeration, powdered carbon can effectively adsorb refractory organic pollutants and chromatic substances, and reduce ammonia nitrogen, and filter through submerged ultrafiltration membrane modules to intercept all activated carbon powder, suspended solids, colloids, etc. The effect of removing COD, ammonia nitrogen, chroma, and turbidity in the effluent is remarkable; at the same time, because some microorganisms can enter the internal micropores of activated carbon, the dissolved oxygen in the internal pores is insufficient to form an anoxic environment, which has a certain denitrification effect. Therefore, powder activated carbon membrane biological The reactor also has a certain nitrate nitrogen removal function; the resin tank is filled with specific nitrate resin, and the nitrate ion in the influent is adsorbed by ion exchange method, and the specific nitrate resin can reduce the competitive adsorption of sulfate ion , resistant to organic pollution, high denitrification efficiency, nitrate nitrogen content in the effluent is less than 1mg/L, after the resin is saturated, it is desorbed and regenerated with ordinary salt water, and the nitrate ions and other impurities adsorbed by the resin are eluted Remove it to restore its original composition and performance.

The regenerated waste liquid first enters the denitrification tank for denitrification treatment. The activated sludge that has been successfully domesticated with high salinity is placed in the tank, which can withstand a salinity of no higher than 5%. Under this condition, the denitrifying bacteria still maintain a high activity , the nitrate in the sewage is converted into N ₂ and directly discharged to the atmosphere, the effluent enters the nitrification tank, and through the action of nitrifying bacteria successfully domesticated under high salinity, the ammonia nitrogen is converted into nitrate nitrogen, and the mixed solution is returned to the denitrification tank for further removal Ammonia nitrogen, nitrate nitrogen, and the mud-water mixture that finally flows out of the nitrification tank do not need to be separated, and all flow back to the primary chemical tank, realizing the treatment and reuse of the regeneration waste liquid, and the entire resin regeneration waste liquid treatment process does not produce any pollutants. .

Please refer to Fig. 2, a method for advanced sewage treatment and resin regeneration waste liquid reuse provided by the present invention, comprising the following steps:

Step 1: The pretreatment effluent of the sewage plant is used as the system inlet water, first enters the biochemical tank 1, and degrades the pollutants through the action of microorganisms in the activated sludge, the mud-water mixture is separated from the solid and liquid through the sedimentation tank 2, and the sludge is discharged to the sludge concentration Pool 8, the effluent enters the powdered activated carbon membrane bioreactor 3;

Step 2: Dosing a certain proportion of powdered activated carbon into the powdered activated carbon membrane bioreactor 3, the dosage of powdered activated carbon is 30-50mg/L, further adsorbing refractory pollutants and chromatic substances, activated carbon slurry in powdered activated carbon Membrane bioreactor 3 accumulates in circulation, and regularly discharges a small amount to the sludge concentration tank, and the effluent flows into resin tank 4; powdered activated carbon membrane bioreactor 3 needs regular backwashing and chemical cleaning, and the backwashing frequency is once every 10 to 15 minutes. The cleaning frequency is once every 1 to 2 months;

Step 3: The sewage flows through the resin tank 4, and the nitrate in the sewage is removed through the action of the specific nitrate ion exchange resin, the total nitrogen in the effluent is reduced, and the effluent meets the discharge standard;

Step 4: The adsorbed saturated resin is desorbed and regenerated with 4.0% to 5.0% NaCl solution, the sodium chloride content in the waste liquid formed by resin regeneration is 1.5% to 2.5%, and the nitrate nitrogen content is 650 to 800 mg/L. The waste liquid is first collected into the waste liquid collection pool 5, and then enters the denitrification pool 6 for denitrification. The dissolved oxygen content is controlled at 0.5-1.0 mg/L, and the sludge concentration is 3000-5000 mg/L. Dosing of carbon source, the amount of COD converted from carbon source is 3 to 4 times of the nitrate concentration in the denitrification tank 6, and the waste liquid is removed through the action of denitrification bacteria derived from the successfully domesticated activated sludge flora at a certain salinity Nitrate nitrogen in, it is converted into N ₂ is removed, and the effluent enters the nitrification tank 7;

Step 5: In the nitrification tank 7, the content of dissolved oxygen is controlled to be 2.0-4.0 mg/L, and the sludge concentration is 3000-5000 mg/L. The nitrifying bacteria in the mud flora act on the nitrification reaction to further reduce the content of ammonia nitrogen and CODcr. The mixed solution of the effluent from the nitrification tank 7 first flows back to the denitrification tank 6, and the final mud-water mixture from the nitrification tank 7 flows back to the biochemical tank 1 to realize Reuse of resin regeneration waste liquid.

It should be understood that the parts not described in detail in this specification belong to the prior art.

It should be understood that the above-mentioned descriptions for the preferred embodiments are relatively detailed, and should not therefore be considered as limiting the scope of the patent protection of the present invention. Within the scope of protection, replacements or modifications can also be made, all of which fall within the protection scope of the present invention, and the scope of protection of the present invention should be based on the appended claims.

Claims (10)

1. a kind of advanced treatment of wastewater and the system of acid-basic regenerated waste liquids in water reuse, it is characterised in that：Including biochemistry pool (1), precipitation Pond (2), Powdered Activated Carbon membrane bioreactor (3), resin container (4), waste collection pond (5), denitrification pond (6), nitrification tank (7), sludge concentration tank (8)；

Sewage plant is intake after pretreatment, and the biochemistry pool (1) is first fed into, and is degraded by the effect of Microbial Communities in Activated Sludge Pollutant, muddy water mixed solution are sent into the sedimentation basin (2) and are separated by solid-liquid separation；It is dense that the interior sludge of the sedimentation basin (2) drains into the sludge The Powdered Activated Carbon membrane bioreactor (3) is sent into contracting pond (8), water outlet；In the Powdered Activated Carbon membrane bioreactor (3) A certain amount of Powdered Activated Carbon has been added, pollutant and color species difficult to degrade are further adsorbed；The powder activity carbon membrane The interior activated carbon slurry of bioreactor (3) periodically drains on a small quantity in the interior circulative accumulation of the Powdered Activated Carbon membrane bioreactor (3) The sludge concentration tank (8)；The resin container (4) is sent into Powdered Activated Carbon membrane bioreactor (3) water outlet, by obligate The effect of nitrate ion exchanger resin removes the nitrate anion in sewage, reduces water outlet total nitrogen, and standard water discharge discharge realizes dirt Water depth processing；

The interior resin adsorption of the resin container (4) gets the full passing sodium chloride solution regeneration, and the waste liquid centralized collection of formation is given up to described Liquid collecting pit (5) is sent into the denitrification pond (6) and carries out denitrification later；It is acted under anoxic conditions by denitrifying bacteria The nitrate nitrogen in waste liquid is removed, the nitrification tank (7) is sent into water outlet, is nitrified by nitrobacteria effect under aerobic condition Reaction, further decreases ammonia nitrogen, CODcr contents；The nitrification tank (7) goes out water mixed liquid and is first back to the denitrification pond (6), The muddy water mixed solution that the nitrification tank (7) is finally flowed out all is back to the biochemistry pool (1), realizes acid-basic regenerated waste liquids in water Reuse.

2. advanced treatment of wastewater according to claim 1 and the system of acid-basic regenerated waste liquids in water reuse, it is characterised in that：It is described Submerged ultrafiltration component is equipped in Powdered Activated Carbon membrane bioreactor (3), membrane material is PVC hollow-fibre membranes, filtering essence Degree is 0.001~0.02 μm, and filter type is inner pressed, produces water turbidity ＜ 0.1NTU, and maximum intake pressure is 0.45MPa；Institute It states in Powdered Activated Carbon membrane bioreactor (3) and adds a certain amount of Powdered Activated Carbon, adsorb pollutant difficult to degrade and coloration Substance intercepts active powdered carbon using submerged ultrafiltration component, reduces water outlet CODcr, coloration, ammonia nitrogen, nitrate nitrogen, hangs Float and colloid.

3. advanced treatment of wastewater according to claim 1 and the system of acid-basic regenerated waste liquids in water reuse, it is characterised in that：It is described Obligate nitrate ion exchanger resin is large pore anion nitrate ion resin, and mode of appearance is spherical particle, and skeleton is poly- Ethylene-divinylbenzene, functional group are quaternary amine base, and particle size range is 300~1200 μm, and full exchange capacity is more than 900mol/m3, Water content is 50-56%, loading density 675-720g/l.

4. advanced treatment of wastewater according to claim 1 and the system of acid-basic regenerated waste liquids in water reuse, it is characterised in that：It is described It is equipped with microporous aeration device (11) in denitrification pond (6) and the nitrification tank (7), is supplied oxygen by wind turbine (12), and dispensing has The activated sludge successfully tamed by high salinity.

5. advanced treatment of wastewater and the system of acid-basic regenerated waste liquids in water reuse according to any one of claims 1-4, special Sign is：The system is also equipped with carbon source tank (9) and feeding apparatus for powdered activated charcoal (10)；The carbon source tank (9) is used for institute It states and adds carbon source in denitrification pond (6), the feeding apparatus for powdered activated charcoal (10) is used for powder activity carbon membrane biology Powdered Activated Carbon is added in reactor (3).

6. a kind of advanced treatment of wastewater and the method for acid-basic regenerated waste liquids in water reuse, which is characterized in that include the following steps：

Step 1：It is that system is intake with sewage plant pretreatment water outlet, initially enters biochemistry pool (1), pass through Microbial Communities in Activated Sludge Effect degradation of contaminant, muddy water mixed solution is separated by solid-liquid separation by sedimentation basin (2), and sludge drains into sludge concentration tank (8), be discharged into Enter Powdered Activated Carbon membrane bioreactor (3)；

Step 2：A certain proportion of Powdered Activated Carbon is added into Powdered Activated Carbon membrane bioreactor (3), further absorption is difficult The pollutant and color species of degradation, activated carbon slurry is in Powdered Activated Carbon membrane bioreactor (3) interior circulative accumulation, periodically on a small quantity Sludge concentration tank (8) is drained into, water outlet flows into resin container (4)；

Step 3：Sewage flows through resin container (4), by the effect of obligate nitrate ion exchanger resin, removes the nitric acid in sewage Root reduces water outlet total nitrogen, standard water discharge discharge；

Step 4：The resin of resin container (4) interior adsorption saturation carries out desorption and regeneration using 4.0%~5.0% NaCl solution, then The raw waste collection formed enters denitrification pond (6) and carries out denitrification, throw under anoxic conditions later to waste collection pond (5) Add carbon source, the nitrate nitrogen in removal waste liquid is acted on by denitrifying bacteria, is translated into N₂Removing, water outlet enter nitrification tank (7)；

Step 5：In nitrification tank (7), is acted on by nitrobacteria under aerobic condition and nitration reaction occurs, further decrease ammonia Nitrogen, CODcr contents, nitrification tank (7) go out water mixed liquid and are back to denitrification pond (6), the muddy water that nitrification tank (7) is finally discharged first Mixed liquor is all back to biochemistry pool (1), realizes the reuse of acid-basic regenerated waste liquids in water.

7. advanced treatment of wastewater according to claim 6 and the method for acid-basic regenerated waste liquids in water reuse, it is characterised in that：Step In 2, the dosage of Powdered Activated Carbon is 30~50mg/L；The Powdered Activated Carbon membrane bioreactor (3) regular backwash, chemistry Cleaning, backwash frequency are that every 10~15min is primary, and chemical cleaning frequency is 1~2 month primary.

8. advanced treatment of wastewater according to claim 6 and the method for acid-basic regenerated waste liquids in water reuse, it is characterised in that：Step In 4, sodium chloride content is 1.5%~2.5% in the waste liquid that resin regeneration is formed, and nitrate nitrogen content is 650~800mg/L.

9. advanced treatment of wastewater according to claim 6 and the method for acid-basic regenerated waste liquids in water reuse, it is characterised in that：Step In 4, denitrification pond (6) the internal carbon source conversion COD dosages are 3~4 times of nitrate concentration in denitrification pond；Step 4 and step In rapid 5, denitrifying bacteria and nitrobacteria in the denitrification pond (6) and the nitrification tank (7) derive from certain salt The lower activated sludge flora for passing through successfully domestication of degree.

10. the method for the advanced treatment of wastewater and acid-basic regenerated waste liquids in water reuse according to claim 6-9 any one, special Sign is：In step 4, the content control of dissolved oxygen is 0.5~1.0mg/L, and sludge concentration is 3000~5000mg/L；Step 5 In, the content control of dissolved oxygen is 2.0~4.0mg/L, and sludge concentration is 3000~5000mg/L.