CN113277677B

CN113277677B - Treatment method and reuse water treatment process for production wastewater of disposable nitrile gloves

Info

Publication number: CN113277677B
Application number: CN202110568354.6A
Authority: CN
Inventors: 胡光文; 逯焕肖
Original assignee: Jinan Guangbo Environmental Protection Technology Co ltd
Current assignee: Jinan Guangbo Environmental Protection Technology Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-09-16
Anticipated expiration: 2041-05-25
Also published as: CN113277677A

Abstract

The invention discloses a method for treating waste water generated in the production of disposable nitrile gloves, which comprises the following steps: collecting the incoming water through a regulating tank; then deslagging is carried out through a coagulation air flotation machine 1; then cooling by a cooling tower; then the sewage passes through a hydrolysis acidification tank and a biological selection tank and is treated by a primary A reaction tank, a primary O reaction tank, a secondary A reaction tank and a secondary O reaction tank in sequence; then separating the sludge and water by an MBR membrane tank; then, sterilizing and deslagging the sewage, discharging, pressing the sludge into mud cakes and transporting the mud cakes; a treatment process for reuse water in production of disposable nitrile gloves comprises the following steps: filtering the incoming water through a multi-media filter; then pumping the concentrated water to a reverse osmosis device, and treating the generated concentrated water by an ozone catalytic oxidation tower and a two-stage A/O pool; and then the sewage enters a Fenton reaction tank for treatment. The invention has the advantages that after two-stage RO filtration and concentration, 70 percent of purified water is reused for production, and 30 percent of concentrated water is discharged after further advanced treatment reaches the discharge requirement.

Description

Treatment method and reuse water treatment process for production wastewater of disposable nitrile gloves

Technical Field

The invention relates to the technical field of treatment of waste water produced by disposable butyronitrile gloves, in particular to a treatment method and a reuse water treatment process for the waste water produced by the disposable butyronitrile gloves.

Background

The disposable butyronitrile gloves are chemical synthetic materials, acrylonitrile and butadiene are subjected to special process treatment and formula improvement, the air permeability and the comfort degree are close to those of latex gloves, and meanwhile, the phenomenon of skin allergy cannot be caused. Nitrile gloves have been developed in recent years and are produced by cleaning to a grade of 100, 1000. Most of the disposable butyronitrile gloves are powder-free.

The nitrile rubber is an irregular copolymer, is mainly obtained by carrying out emulsion polymerization or solution polymerization on acrylonitrile and butadiene monomers, and has very good oil resistance, water resistance and air tightness. Many auxiliary agents, such as an initiator, an activator, an electrolyte, a regulator, a dispersant, a terminating agent and an anti-aging agent, which are added in the reaction process, are used in the process of synthesizing the nitrile rubber by the emulsion polymerization process, and the auxiliary agents have certain toxicity. Therefore, the wastewater generated in the production process of the nitrile rubber has more toxic and harmful substances, such as acrylonitrile, acrylamide, acrylic acid, acrolein and the like, the substances have stronger toxicity and have inhibiting effect on microorganisms, and the COD and the concentration of nitrogen-containing pollutants in the nitrile rubber wastewater are high, so the nitrile rubber wastewater is organic wastewater which is difficult to degrade.

Disclosure of Invention

The invention aims to provide a method for treating waste water produced in disposable nitrile gloves and a process for treating recycled water, which have the advantages that after two-stage RO filtration and concentration, 70% of purified water is recycled for production, and 30% of concentrated water is further deeply treated to meet the emission requirement and then is discharged, and the problem that more toxic and harmful substances such as acrylonitrile, acrylamide, acrylic acid, acrolein and the like exist in the waste water produced in the production process of nitrile rubber, the substances have stronger toxicity and have an inhibiting effect on microorganisms, and the COD and the concentration of nitrogen-containing pollutants in the nitrile rubber waste water are high, so that the nitrile rubber waste water is organic waste water which is difficult to degrade is solved.

In order to achieve the purpose, the invention provides the following technical scheme:

a method for treating waste water generated in the production of disposable nitrile gloves comprises the following steps:

s1, collecting the incoming water through a regulating tank to homogenize the water quality;

s2, lifting the water in the adjusting tank to a coagulation air flotation machine 1, adding PAC and PAM to form large pieces of floating slag from the dispersed SS in the water, and removing the floating slag through a slag scraper;

s3, discharging water from the coagulation air flotation machine 1 to a cooling tower for cooling, and cooling the water to below 40 ℃;

s4, then, hydrolyzing and acidifying the macromolecular organic matters and the soluble colloid in a hydrolysis and acidification pool to decompose;

s5, enabling the effluent of the hydrolysis acidification tank to automatically flow into a biological selection tank, so as to achieve a better anaerobic environment and provide good action conditions for phosphorus accumulating bacteria;

s6, overflowing the biological selection tank to the first-stage A reaction tank, reducing and converting most nitrate nitrogen into nitrogen, generating certain oxygen and alkalinity in the denitrification process, and reducing the addition amount of alkali and the air usage in the system;

s7, discharging water from the first-stage A reaction tank to a first-stage O reaction tank, and refluxing the internal reflux liquid of the first-stage O reaction tank to the first-stage A reaction tank, so that favorable conditions are provided for oxidation reaction and nitration reaction to remove most organic pollutants in the first-stage O reaction tank, and most ammonia nitrogen in the inlet water is converted into nitrate nitrogen;

s8, enabling the effluent of the primary O reaction tank to enter a secondary A reaction tank, further denitrifying nitrate nitrogen in the effluent of the primary O reaction tank to reduce the nitrate nitrogen into nitrogen, and generating a certain amount of oxygen and alkalinity in the denitrification process to reduce the addition amount of alkali and the air usage amount in the system;

s9, discharging water from the second-stage A reaction tank to a second-stage O reaction tank, further removing organic pollutants, converting the residual ammonia nitrogen into nitrate nitrogen, increasing the oxygen content of the sludge-water mixed solution and blowing off nitrogen in the sewage;

s10, overflowing the effluent of the secondary O reaction tank to an MBR membrane tank, further degrading pollutants in water, and separating sludge from water by utilizing the interception effect of membrane filaments;

s11, enabling effluent of the MBR membrane tank to flow to the membrane water production comprehensive tank, adding a bactericide into the membrane water production comprehensive tank to kill bred bacteria, and preventing membrane pollution and pollution blockage caused by bacterial breeding in a subsequent membrane recycling process;

s12, lifting the water in the membrane water production comprehensive pool to a coagulation air flotation machine 2, adding PAC and PAM to flocculate a small amount of residual sludge thalli in the water into clusters, and removing the clusters through a residue scraper;

s13, discharging water from the coagulation air floatation machine 2 to an intermediate water pool;

and S14, allowing sludge generated by the MBR membrane tank to flow to a sludge concentration tank, concentrating the sludge generated in the sewage treatment process, and squeezing the sludge by a spiral filter press to form a mud cake for outward transportation.

Preferably, the first-stage A reaction tank and the second-stage A reaction tank are both mechanically stirred and simultaneously added with a carbon source, the period of the first-stage A reaction tank is controlled to be 8-16h, DO is less than or equal to 0.3mg/L, the period of the second-stage A reaction tank is controlled to be 4-12h, and DO is less than or equal to 0.3 mg/L.

Preferably, the primary O reaction tank and the secondary O reaction tank are internally provided with blast aeration oxygen supply, alkali liquor is added to maintain the effluent alkalinity, the period of the primary O reaction tank is controlled to be 16-32h, the dissolved oxygen is controlled to be 2-6mg/L, the pH value is controlled to be 6-9, the sludge age is controlled to be 15-30 days, the period of the secondary O reaction tank is controlled to be 1-8h, the dissolved oxygen is controlled to be 3-6mg/L, the pH value is controlled to be 6-9, and the sludge age is controlled to be 15-30 days.

Preferably, the intermediate water tank is a collection and lifting water tank for a subsequent recycling process.

A treatment process for reuse water in production of disposable nitrile gloves comprises the following steps:

s1, the water pump of the middle water tank is communicated with the multi-media filter, and filter materials such as quartz sand, anthracite and the like filled in the middle water tank are utilized to remove suspended matters and colloid impurities in water, so that the turbidity of the effluent is reduced;

s2, pumping the effluent of the medium filter to a reverse osmosis device through a high-pressure pump, and ensuring the production and the reuse of the produced water;

s3, collecting the concentrated water generated by the reverse osmosis device by using a reverse osmosis concentrated water collecting pool;

s4, backwashing the multi-medium filter tank by using reverse osmosis concentrated water, so that the concentrated water can be better utilized, and impurities in the multi-medium filter tank which runs for a long time are transferred to the concentrated water;

s5, enabling the concentrated water to flow to an ozone catalytic oxidation tower, and combining the strong oxidizing property of ozone and the adsorption and catalysis properties of a catalyst by using the ozone catalytic oxidation tower, so that the problem of incomplete degradation of organic matters can be effectively solved;

s6, degrading COD of the sewage through a two-stage A/O pool, and performing biochemical denitrification;

s7, allowing the sewage to flow into a secondary sedimentation tank for solid-liquid separation of sludge and water;

s8, overflowing the wastewater in the secondary sedimentation tank into a Fenton reaction tank, and oxidizing and degrading the sewage indiscriminately by a Fenton reagent;

s9, precipitating sludge generated by Fenton reaction through a Fenton sedimentation tank, discharging the sludge to a sludge concentration tank, and discharging the effluent after reaching the standard.

Preferably, the reverse osmosis device removes most of ions, silicon dioxide and the like in water by using a membrane separation technology, so that TDS is greatly reduced, and the produced water is ensured to be recycled.

Preferably, the residual ozone in the S5 is blown off by an ozone blowing-off tank because the residual ozone is toxic to the subsequent biochemical process.

Compared with the prior art, the invention has the beneficial effects that:

through setting up coagulation air supporting machine 1 and coagulation air supporting machine 2, coagulation air supporting machine 1 all adopts the microbubble generator with coagulation air supporting machine 2, replace traditional bleed equipment to the aquatic dissolved air, and install a plurality of sloping nest of tubes in the air supporting region, the power distribution box comprises a box body, scrape the sediment machine, a complete air supporting purifier is constituteed jointly to the spiral discharge machine, at the coagulation zone add the PAC, the purpose of PAM is reinforcing flocculation effect, make the suspension agglomerate into the large slice scum layer for the thing, greatly reduced reynolds coefficient, make the air supporting avoid going on under the turbulent state, make good laminar flow state, reach the effect of shallow air supporting, and on the same reason, when the density of suspended solid is greater than 1, will produce the effect that the shallow pool deposits, thereby make to deposit and go on under the turbulent condition. Pollutants with large grain diameter and large specific gravity and difficult to float can be concentrated in the sludge collection area, so that the aim of purifying water is fulfilled;

by arranging a first-level A reaction tank, a first-level O reaction tank, a second-level A reaction tank and a second-level O reaction tank, sewage passes through the first-level A reaction tank (anoxic section), the first-level O reaction tank (aerobic section), the second-level A reaction tank (anoxic section) and the second-level O reaction tank (aerobic section), wherein the first-level O reaction tank forms the advantages of nitrite bacteria by controlling the dissolved oxygen, the pH value and the sludge age according to different adaptive conditions of nitrite bacteria and nitrobacteria, NH3-N is mainly nitrified to NO2-, short-cut nitrification is realized, mixed liquid in the first-level O reaction tank partially flows back to the first-level A reaction tank, the water carbon source and a supplementary carbon source are utilized for denitrification, the second-level A reaction tank realizes denitrification by supplementing methanol as the carbon source, the O2 section controls higher dissolved oxygen, residual methanol and residual organic matters in the sewage are further oxidized, and residual NO 2-N is further nitrified, the performance of the activated sludge is improved;

by arranging the MBR membrane tank, the concentration of suspended solids in the effluent is basically zero due to the high-efficiency interception of the membrane in the MBR membrane tank; the biological reactor has a huge interception effect on free bacteria and some macromolecular granular substances which are difficult to degrade, and the biological phases in the biological reactor are rich, for example, nitrifying bacteria with longer generation time can be enriched, and protozoa and metazoans can also grow; the membrane effluent is not influenced by factors such as sludge expansion in a bioreactor, so the effluent quality of the MBR is high, the requirement of the quality of reuse water can be met, the long sludge age operation does not influence the effluent quality due to the interception effect of the membrane in the MBR, the reduction of the residual sludge amount can reduce the sludge treatment cost and simplify the operation of the sewage treatment process, and particularly, the membrane bioreactor has more outstanding superiority for small sewage treatment plants and dispersed sewage treatment facilities;

by arranging the ozone catalytic oxidation tower, the strong oxidizing property of ozone and the adsorption and catalysis properties of the catalyst are combined, so that the problem of incomplete degradation of organic matters can be effectively solved;

by arranging the Fenton reaction tank, the Fenton reagent has strong oxidability, and the oxidability has no selectivity, so that the Fenton reaction tank can adapt to the treatment of various waste water.

Drawings

FIG. 1 is a flow diagram of a wastewater treatment process according to the present invention;

FIG. 2 is a flow diagram of the process for treating reuse water according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides a technical scheme of a method for treating waste water generated in production of disposable nitrile gloves

s3, discharging water from the coagulation air flotation machine 1 to a cooling tower for cooling, wherein the temperature of the disposable butyronitrile wastewater is higher than 50 ℃, if the disposable butyronitrile wastewater is not cooled, the subsequent biochemical section is influenced, so the cooling tower is additionally arranged after air flotation, and the temperature of the water is reduced to be below 40 ℃. The oil-water separation effect of the air floatation is better when the temperature is high, so the air floatation machine is selected to be cooled;

s5, enabling effluent of the hydrolysis acidification tank to automatically flow into a biological selection tank, wherein the biological selection tank is arranged in front of the hydrolysis acidification tank, so that sludge bulking can be prevented, adverse effects of nitrate on an anaerobic tank can be weakened, a better anaerobic environment can be achieved, good action conditions of phosphorus accumulating bacteria can be provided, and a better phosphorus removal effect can be achieved;

s8, enabling the effluent of the primary O reaction tank to enter a secondary A reaction tank, further denitrifying nitrate nitrogen in the effluent of the primary O reaction tank to reduce the nitrate nitrogen into nitrogen, generating certain oxygen and alkalinity in the denitrification process, and reducing the adding amount of alkali and the air consumption in the system, wherein mechanical stirring is arranged in the primary A reaction tank and the secondary A reaction tank, carbon sources are added simultaneously, the period of the primary A reaction tank is controlled to be 8-16h, DO is less than or equal to 0.3mg/L, the period of the secondary A reaction tank is controlled to be 4-12h, and DO is less than or equal to 0.3 mg/L;

s9, discharging water from the second-stage A reaction tank to a second-stage O reaction tank, further removing organic pollutants, converting residual ammonia nitrogen into nitrate nitrogen, increasing the oxygen content of sludge-water mixed liquor and blowing off nitrogen in the sewage, setting blowing aeration oxygen supply in the first-stage O reaction tank and the second-stage O reaction tank, adding alkali liquor to maintain the alkalinity of discharged water, controlling the period of the first-stage O reaction tank to be 16-32h, controlling the dissolved oxygen to be 2-6mg/L, controlling the pH value to be 6-9, controlling the sludge age to be 15-30 days, controlling the period of the second-stage O reaction tank to be 1-8h, controlling the dissolved oxygen to be 3-6mg/L, controlling the pH value to be 6-9 and controlling the sludge age to be 15-30 days;

s10, overflowing the effluent of the secondary O reaction tank to an MBR membrane tank, further degrading pollutants in the water, and simultaneously separating sludge from water by utilizing the interception function of membrane filaments;

s12, lifting the water in the membrane water production comprehensive pool to a coagulation air flotation machine 2, flocculating a small amount of residual sludge thalli in the water into clusters by adding PAC and PAM, the coagulation air flotation machine 1 and the coagulation air flotation machine 2 are arranged, the coagulation air flotation machine 1 and the coagulation air flotation machine 2 both adopt micro bubble generators to replace the traditional air entraining equipment to dissolve air into water, and a plurality of inclined pipe groups are arranged in the air floatation area, and comprise a box body, a slag scraper and a spiral discharging machine which jointly form a complete air floatation water purification device, the purpose of adding PAC and PAM in the coagulation area is to enhance the flocculation effect, so that suspended matters are coagulated into a large scum layer, the Reynolds coefficient is greatly reduced, the air floatation is prevented from being carried out in a turbulent flow state, a good laminar flow state is manufactured, the shallow air floatation effect is achieved, and the similar effects, when the density of the suspension is greater than 1, a shallow pool effect of sedimentation occurs, so that sedimentation occurs under turbulent conditions. Pollutants with large grain diameter and large specific gravity and difficult to float can be concentrated in the sludge collection area, so that the aim of purifying water is fulfilled;

s13, discharging water from the coagulation air floatation machine 2 to an intermediate water tank, wherein the intermediate water tank is a collection and lifting water tank of a subsequent recycling process;

The invention provides a technical scheme of a treatment process for reuse water in disposable butyronitrile glove production, and the treatment process for the reuse water in disposable butyronitrile glove production comprises the following steps:

s1, the water pump of the middle water tank is communicated with the multi-medium filter, and suspended matters and colloid impurities in water are removed by using filter materials such as quartz sand, anthracite and the like filled in the middle water tank, so that the turbidity of the effluent is reduced;

s2, pumping the effluent of the medium filter to a reverse osmosis device through a high-pressure pump, wherein the produced water ensures the production and reuse, and the reverse osmosis device removes most of ions, silicon dioxide and the like in the water by using a membrane separation technology, so that the TDS is greatly reduced;

s5, allowing the concentrated water to flow to an ozone catalytic oxidation tower, and combining the strong oxidizing property of ozone with the adsorption and catalytic properties of a catalyst by using the ozone catalytic oxidation tower, so that the problem of incomplete degradation of organic matters can be effectively solved, and residual ozone is toxic to a subsequent biochemical process, so that the ozone stripping tank is used for stripping;

s8, overflowing the wastewater in the secondary sedimentation tank into a Fenton reaction tank, wherein the oxidation capacity of Fenton is second to that of hydrofluoric acid in the solution, so that a common reagent is difficult to oxidize persistent organic matters, particularly aromatic compounds and some heterocyclic compounds, and most of the Fenton reagents can be oxidized and degraded indiscriminately;

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A method for treating waste water generated in the production of disposable nitrile gloves is characterized by comprising the following steps:

s10, overflowing effluent of the secondary O reaction tank to an MBR membrane tank, further degrading pollutants in water, separating sludge and water by utilizing the interception effect of membrane filaments, flowing the sludge generated by the MBR membrane tank to a sludge concentration tank, concentrating the sludge generated in the sewage treatment process, squeezing the concentrated sludge by a stack spiral filter press to form a mud cake, transporting the mud cake outwards, arranging blast aeration oxygen supply in the primary O reaction tank and the secondary O reaction tank, adding alkali liquor to maintain the effluent alkalinity, controlling the period of the primary O reaction tank at 16-32h, controlling the dissolved oxygen at 2-6mg/L, controlling the pH value at 6-9, controlling the sludge age at 15-30 days, controlling the period of the secondary O reaction tank at 1-8h, controlling the dissolved oxygen at 3-6mg/L, controlling the pH value at 6-9, and controlling the sludge age at 15-30 days;

s14, the water pump of the middle water tank is communicated with the multi-medium filter, and suspended matters and colloidal impurities in water are removed by using quartz sand and anthracite filter materials filled inside, so that the turbidity of the effluent is reduced;

s15, pumping the effluent of the medium filter to a reverse osmosis device through a high-pressure pump, and ensuring the production and reuse of the produced water;

s16, collecting the concentrated water generated by the reverse osmosis device by using a reverse osmosis concentrated water collecting pool;

s17, backwashing the multi-medium filter tank by using reverse osmosis concentrated water, so that the concentrated water can be better utilized, and impurities in the multi-medium filter tank which runs for a long time are transferred to the concentrated water;

s18, enabling the concentrated water to flow to an ozone catalytic oxidation tower, and combining the strong oxidizing property of ozone and the adsorption and catalysis properties of a catalyst by using the ozone catalytic oxidation tower, so that the problem of incomplete degradation of organic matters can be effectively solved;

s19, degrading COD of the sewage through a two-stage A/O pool, and performing biochemical denitrification;

s20, allowing the sewage to flow into a secondary sedimentation tank for solid-liquid separation of sludge and water;

s21, overflowing the wastewater in the secondary sedimentation tank into a Fenton reaction tank, and oxidizing and degrading the sewage indiscriminately by a Fenton reagent;

s22, precipitating sludge generated by Fenton reaction through a Fenton sedimentation tank, discharging the sludge to a sludge concentration tank, and discharging the effluent after reaching the standard.

2. The method for treating the waste water generated in the production of the disposable nitrile gloves according to claim 1, wherein the method comprises the following steps: the reverse osmosis device utilizes a membrane separation technology to remove most of ions and silicon dioxide in water, thereby greatly reducing TDS and ensuring the production and reuse of the produced water.

3. The method for treating the waste water generated in the production of the disposable nitrile gloves according to claim 1, which is characterized in that: the residual ozone in the S18 is toxic to the subsequent biochemical process, so the ozone stripping tank is used for stripping.