Polycarbon wastewater treatment system

Abstract

The utility model relates to the field of sewage treatment, in particular to a poly-carbon wastewater treatment system, which comprises an accident tank, a homogeneous regulation tank, a pretreatment BAF tank, an A / O biochemical treatment tank, a secondary sedimentation tank, a coagulative precipitation tank, a denitrification filter tank, a post-treatment BAF tank, a catalytic ozonation tank, a quartz sand filter and an activated carbon filter tank, wastewater to be treated is monitored by the online monitoring equipment, then enters the homogeneous regulation tank, is treated by the wastewater treatment system, is finally detected by the online monitoring equipment, and is discharged uniformly; in the process, a dominant flora aiming at the water quality characteristics of the wastewater is cultured by using a novel biological filler, organic matters, impurities and the like in the wastewater are removed, and meanwhile, the cultured dominant flora is convenient to maintain and can be used for treating a large-flow water body; the ozone catalytic oxidation pond is used, a catalyst is used under the ozone condition, non-selective hydroxyl free radicals are obtained through decomposition, deep oxidation is conducted on organic matter in the water body, and the removal effect on the organic matter is obvious.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a polycarbonate wastewater treatment system. Background Art

[0002] Polycarbonate (PC) is a general term for a class of high molecular polymers containing carbonate groups (—OROCO—) in the molecular chain. Due to its good insulation, light transmittance, weather resistance, impact resistance and chemical stability, it is widely used in construction, transportation, electronics and other fields.

[0003] However, a large amount of polycarbonate wastewater will be produced during the preparation process of polycarbonate. The concentration of volatile phenols in the polycarbonate wastewater is relatively high. Volatile phenols are strongly toxic to other organisms, so the removal of volatile phenols is particularly important. In addition to being toxic, volatile phenols will also increase the carbon-nitrogen ratio of the polycarbonate wastewater, which is not conducive to the smooth progress of the denitrification process and will also affect the biodegradability of the sewage.

[0004] For example, patent CN 107298494 A discloses a system and method for treating wastewater generated in a polycarbonate process, which utilizes the adsorption characteristics of a porous solid catalyst to adsorb organic matter, then adds an oxidant, and then catalytically oxidizes and digests the organic matter, and then filters and removes the washed powder through a filtering device, thereby achieving the effect of deeply digesting the wastewater generated in the polycarbonate process. The wastewater generated in the polycarbonate process contains a large amount of organic matter such as polycarbonate small molecule polymers, bisphenol A, triethylamine, and p-tert-butylphenol. The adsorption characteristics of the porous solid catalyst are mainly used to adsorb organic matter and its mixed salts, and recover high-salt wastewater. Therefore, the denitrification capacity of the subsequent sewage and the carbon-nitrogen ratio of the wastewater are not involved.

[0005] Therefore, there is currently a lack of a complete treatment system for wastewater generated by the polycarbonate process to facilitate the treatment of wastewater to meet discharge requirements. Utility Model Content

[0006] In order to solve the problems mentioned in the background technology and overcome the above shortcomings, the utility model provides the following technical solutions:

[0007] Since this wastewater treatment system is mainly used to treat wastewater generated by the production line during the polycarbonate process, it can also treat domestic wastewater, initial rainwater, and wastewater discharged from circulating water plants. Its main purpose is to remove COD, ammonia nitrogen, volatile phenols, formaldehyde and other substances, improve water treatment effects, reduce treatment costs, and ensure effluent quality.

[0008] Specifically, the polycarbonate wastewater treatment system includes a homogenization regulating tank, a pretreatment BAF tank, an A / O biochemical treatment tank, a secondary sedimentation tank, a coagulation sedimentation tank, a denitrification filter tank, a post-treatment BAF tank, an ozone catalytic oxidation tank, a quartz sand filter, and an activated carbon filter tank; the wastewater to be treated is monitored by the water online monitoring equipment, enters through the water inlet pipe, is treated by the wastewater treatment system, and finally enters the monitoring water tank. After being monitored by the water online monitoring equipment and meeting the discharge conditions, it is discharged from the pipeline in a unified manner.

[0009] The homogenizing regulating tank, pretreatment BAF tank, A / O biochemical treatment tank, secondary sedimentation tank, coagulation sedimentation tank, denitrification filter, post-treatment BAF tank, ozone catalytic oxidation tank, quartz sand filter, and activated carbon filter are all provided with water inlet and water outlet; the water inlet of the homogenizing regulating tank is connected to the water inlet pipeline of the wastewater to be treated through a pipeline; the water outlet of the homogenizing regulating tank is connected to the water inlet of the pretreatment BAF tank through a pipeline; the water outlet of the pretreatment BAF tank is connected to the water inlet of the A / O biochemical treatment tank through a pipeline; the water outlet of the A / O biochemical treatment tank is connected to the water outlet of the secondary sedimentation tank through a pipeline. The sludge precipitated in the secondary sedimentation tank enters the sludge thickening tank, and the wastewater is lifted by the outlet of the secondary sedimentation tank through a pump through a connecting pipe and enters the coagulation sedimentation tank; a dosing port is provided in the coagulation sedimentation tank, and the generated sludge is sent to the sludge thickening tank, and the generated sewage enters the denitrification filter tank through the outlet weir of the coagulation sedimentation tank; the outlet of the denitrification filter tank is connected to the water inlet of the post-treatment BAF tank through a pipeline; the outlet of the post-treatment BAF tank is connected to the water inlet of the ozone catalytic oxidation tank through a pipeline; a pipeline for introducing ozone is provided in the ozone catalytic oxidation tank.

[0010] Furthermore, an accident pool is provided in front of the homogeneous regulating tank, and a stream of wastewater to be treated is led in for monitoring through an online water monitoring device. If the wastewater to be treated exceeds the standard, the wastewater exceeding the standard first enters the accident pool through an inlet pipe for storage and then enters the homogeneous regulating tank; if the wastewater to be treated meets the inlet requirements, the wastewater to be treated directly enters the water inlet of the homogeneous regulating tank through the inlet pipe.

[0011] Furthermore, waste gas collection is required in both the accident pool and the homogeneous regulating pool, so as to solve the problem of unorganized waste gas emission in wastewater at the initial end; the waste gas discharged from the accident pool and the homogeneous regulating pool enters the biological deodorization module, and is discharged after biological deodorization reaches the emission standard, and the wastewater discharged from the outlet of the homogeneous regulating pool enters the pretreatment BAF pool;

[0012] The homogenization regulating tank homogenizes the wastewater quality, reduces the impact on the sewage treatment system, prevents drastic changes in the internal environment of the system, ensures the stability of the biochemical system treatment load and the stability of the reagent addition, and prevents high concentrations of toxic and harmful substances from directly entering the biochemical system with the water flow from the source.

[0013] The pretreatment BAF pool adopts a characteristic filler with a light weight and a high cavity rate and a new isolation aeration technology to form a biological filter. During the isolation aeration, the water in the isolation tube is oxygenated, and under the lift of the bubbles, a longitudinal water flow circulation centered on the isolation tube is formed, so that the sewage treated in it continuously passes through the aeration area and the filler area, and is repeatedly aerated and oxygenated to react and degrade, so that the wastewater entering the pretreatment BAF pool forms a large-flow internal circulation water flow inside the pretreatment BAF pool. During the internal circulation of the water flow, the biological filler bed can use the characteristics of the sewage itself to quickly cultivate a superior microbial flora with good adaptability to the sewage, forming a biological oxidation bed with good exclusive performance. The activity of the biological flora is maintained through long-term operation and high-efficiency backwashing technology, forming a biological filter with high efficiency and good stability, thereby achieving the purpose of treating sewage; at the same time, the large-flow internal circulation makes the pretreatment BAF pool have the characteristics of a completely mixed reactor, and the water quality of the sewage entering the pretreatment BAF pool is diluted, which can improve the performance of the pretreatment BAF pool in resisting toxic substances and impact resistance, making it more adaptable and more stable in operation.

[0014] A backwash sedimentation tank is also externally connected to the water outlet end of the pretreatment BAF tank, and backwash air and backwash water are distributed in the pretreatment BAF tank. Backwash air is distributed in the pretreatment BAF tank through an external compressed air tank, and the exhaust gas finally discharged enters the exhaust gas collection pipe. The backwash wastewater generated by the high-efficiency backwashing technology enters the backwash sedimentation tank from the pretreatment BAF tank. After the backwash wastewater is precipitated in the backwash sedimentation tank, it enters the water inlet of the A / O biochemical treatment tank from the water outlet.

[0015] The A / O biochemical treatment pool uses the A / O process to treat sewage, and is composed of two parts: the A pool and the aerobic MBBR pool. The wastewater flowing out of the pretreatment BAF pool first enters the A pool from the A pool inlet and then is discharged from the A pool outlet to the aerobic MBBR pool. The purpose is to remove organic matter and obtain a good denitrification effect;

[0016] Furthermore, the A pool is an anoxic pool, under which a hydrolysis reaction occurs. Under anoxic conditions, glucose is added, and complex organic matter is decomposed into simple compounds with the participation of hydrolases. In addition to being able to degrade organic pollutants, the denitrification technology under anoxic conditions is applied before aerobic activated sludge, which can also achieve a very good denitrification effect in this process; the waste gas in the A pool enters the waste gas collection pipe, and the wastewater from the A pool to which glucose has been added enters the water inlet of the aerobic MBBR pool.

[0017] Aerobic MBBR tank is a combination of aerobic tank and moving bed biofilm process (MBBR). MBBR process provides growth carrier for microorganisms through suspended fillers. The effective surface area of ​​biological fillers is large and suitable for microorganisms to attach and grow. Through the full fluidization of suspended fillers and the basic principle of biofilm method, the advantages of activated sludge method are fully utilized to achieve efficient sewage treatment.

[0018] Furthermore, the aerobic MBBR tank includes a biological filler module, a tank body, an aeration system, and an interception screen;

[0019] Furthermore, in order to prevent the loss of fluidized suspended filler, an interception screen is set at an appropriate position in the aerobic zone for simple interception and separation; the screen is made of stainless steel and its type is matched with the suspended filler;

[0020] Furthermore, the aeration system in the aerobic MBBR tank is provided with an aeration fan, and the fluidization of the biological filler is mainly achieved by the aeration fan; in the aerobic zone, proper aeration is performed by the aeration fan to ensure the fluidization effect of the biological carrier fluidized filler, so that the fluidized filler can flow up and down and forward and backward in the water body, so that the filler and the sewage are fully mixed, collided, and contacted, and the adsorption of pollutants and the like are effectively completed;

[0021] In the aerobic section, organic matter is oxidized and decomposed by aerobic microorganisms, and organic nitrogen is converted into nitrate ammonia through ammonification and nitrification. The wastewater flows back from the aerobic MBBR pool to the A pool, and the nitrate ammonia flows back into the anoxic section through the nitrification liquid. When the wastewater passes through the anoxic section, the denitrifying bacteria in the sludge use nitrate nitrogen and CODcr in the sewage for denitrification, so that the nitrate nitrogen is converted into molecular nitrogen and escapes into the air for effective removal, achieving the effect of removing BOD5 and denitrification at the same time;

[0022] Furthermore, the waste gas discharged from the A / O biochemical treatment tank enters the waste gas collection pipe, the wastewater flows into the secondary sedimentation tank, and the nitrification liquid circulates back between the A tank and the aerobic MBBR tank.

[0023] The secondary sedimentation tank is a biochemical sedimentation tank. The wastewater flowing into the biochemical sedimentation tank first passes through the biochemical sedimentation tank. A part of the precipitated activated sludge is returned to tank A, and the other part is sent to the sludge thickening tank. The waste gas discharged in the sludge thickening tank enters the waste gas collection pipe, and the activated sludge enters the sludge dewatering room. The filter press wastewater obtained in the sludge dewatering room is circulated again into the regulating tank, and the filter press sludge is treated uniformly.

[0024] Furthermore, the sludge generated by the biochemical treatment process must be concentrated in a sludge thickening tank, and only after concentration can it be dehydrated and discharged uniformly, that is, the sludge in the biochemical sedimentation tank and the backwash sedimentation tank must first be concentrated in a sludge thickening tank, and then enter the sludge dehydration room through a connecting pipe for dehydration, and finally the sludge is uniformly treated;

[0025] Furthermore, the sludge dewatering room adopts the "dosing chemicals + belt filter press dewatering machine" process. The belt filter press dewatering machine is less affected by sludge load fluctuations, and the moisture content of the sludge is low. It has stable operation, low energy consumption, and relatively simple management and control. The sludge obtained at the end can be aerobically composted by cooperative units to achieve resource recycling.

[0026] The waste gas discharged during the above sewage treatment process is collected through a waste gas collection pipe, which is connected to a biological deodorization module. After being discharged into the biological deodorization module, the waste gas is uniformly discharged from the outlet of the deodorization module after meeting the emission standards.

[0027] Furthermore, the waste gas collected in the waste gas collection pipeline is mainly pollutant gases such as ammonia (NH3), hydrogen sulfide (H2S), phenol, etc. For those that produce more odorous substances, such as accident pools, homogenization adjustment pools, pretreatment BAF, A pools, backwash pools and sludge concentration pools, a covering treatment method is adopted.

[0028] Furthermore, the deodorization module includes a humidification component, a biological filter bed, and an exhaust pipe; the collected malodorous waste gas is transported to the biological deodorization module through a pipeline and humidified by the humidification component. The relative humidity of the humidified gas exceeds 98%, which is convenient for maintaining a good biological environment of the biological filter bed; the air enters the biological filter bed through the air holes of the filter plate at the bottom of the biological filter bed, passes through the biological filter bed from bottom to top, and the purified waste gas is discharged from the exhaust pipe at the outlet of the deodorization module. The height of the exhaust pipe is 16 meters.

[0029] The sewage discharged from the biochemical sedimentation tank enters the intermediate water tank and then enters the coagulation sedimentation tank. PAC and PAM are added to the coagulation sedimentation tank for further sedimentation. The main function is to remove suspended solids and phosphorus.

[0030] Furthermore, the coagulation sedimentation tank adopts an inclined plate sedimentation tank, and the sewage and the added medicine are mixed through the mixing tank, reacted in the reaction tank, and precipitated again in the sedimentation tank. The sludge obtained after precipitation enters the sludge thickening tank, and then enters the sludge dewatering room from the sludge thickening tank for filter pressing, and the discharged wastewater enters the regulating tank.

[0031] The above process completes the preliminary treatment of wastewater, removes waste gas and large particles of precipitated sludge, etc., to facilitate the subsequent post-biochemical process.

[0032] The sewage discharged from the coagulation sedimentation tank enters the denitrification filter, where total nitrogen is removed by adding glucose to ensure the treatment effect of subsequent ozone catalytic oxidation;

[0033] Furthermore, fillers are used in denitrification tanks to perform filtering functions and remove suspended solids and the like.

[0034] The wastewater treated in the denitrification filter enters the post-treatment BAF pool. Under an aerobic environment, microorganisms are used to degrade organic matter and nitrify ammonia nitrogen, giving full play to the biological metabolism, biological flocculation, physical adsorption and interception of biofilms and fillers of microorganisms, and the hierarchical predation of the food chain along the water flow direction in the reactor. Aeration fans are used for further biochemical treatment, and efficient removal of pollutants is achieved through the post-treatment BAF pool.

[0035] The above process completes the further treatment of the wastewater, removes total nitrogen and some organic matter, etc., to facilitate the subsequent deep treatment process.

[0036] The wastewater from the post-treatment BAF pool flows into the ozone catalytic oxidation pool, which is used to decompose the difficult-to-degrade soluble organic pollutants in the wastewater, remove volatile phenols and soluble microbial products (SMP), etc. After the wastewater is treated by the above-mentioned biochemical unit, a large number of biodegradable and biodegradable organic pollutants have been mostly degraded. Through research, it is found that the organic matter remaining in the wastewater mainly includes the original difficult-to-biodegradable organic matter in the wastewater, such as trace amounts of xylenol, trimethylol, pyridine and other organic matter in the external drainage; it also includes SMP generated in the biochemical process. Since SMP is biodegradable, but its degradation rate is very slow, which is only a few tens of times or less of the biodegradation rate of general biodegradable organic matter, it is necessary to use the ozone catalytic oxidation pool to further treat the residual organic matter and SMP in the wastewater;

[0037] Furthermore, in order to improve the treatment efficiency of ozone, a catalyst needs to be added while introducing ozone to trigger the decomposition of ozone to produce .OH. .OH has no selectivity for organic matter and can directly oxidize it into CO2, H2O or mineral salts without causing secondary pollution to water quality. In addition, the catalyst filler can not only improve the utilization efficiency of ozone, but also has adsorption properties, making it easier for organic matter and oxidants to react, which can significantly improve mass transfer and reaction effects.

[0038] A water collecting pool is also provided between the ozone catalytic oxidation pool and the quartz sand filter. The water outlet of the ozone catalytic oxidation pool is connected to the water inlet of the water collecting pool through a pipeline. The water outlet of the water collecting pool is directly connected to the water inlet of a monitoring pool with an online water monitoring device. If the water quality meets the requirements, it can be discharged directly.

[0039] Since wastewater is easily attached to detached biofilm after aeration, which will cause the concentration of suspended matter to increase, if direct discharge cannot meet the standard requirements, the wastewater is discharged from the collection tank into the quartz sand filter, which intercepts BAF detached microorganisms and other suspended impurities to ensure the removal effect.

[0040] The outlet of the quartz sand filter is connected to the monitoring pool and the activated carbon filter pool through a pipe. If the water in the monitoring pool meets the emission standards through the online water monitoring equipment, it will be discharged directly through the outlet of the monitoring pool. If it does not meet the emission requirements, it will pass through the activated carbon filter pool. The activated carbon filter pool is used as a further water quality assurance measure. It can not only re-adsorb and remove organic matter in the wastewater, but also when the water inlet shock is large or the water quality fluctuates greatly, the activated carbon filter pool can be used as a transition device to ensure the stability of the effluent water quality.

[0041] The outlet of the activated carbon filter pool is connected to the monitoring pool through a pipeline, and the discharged wastewater is monitored by the water online monitoring equipment in the monitoring pool. The outlet of the monitoring pool is connected to the water inlet of the stabilization pool through a pipeline; after meeting the discharge requirements, the wastewater is discharged from the outlet of the monitoring pool and then enters the stabilization pool, which is also equipped with water online monitoring equipment. If it meets the discharge standards, it will be discharged from the outlet of the stabilization pool and discharged uniformly through the outlet pipe.

[0042] Furthermore, the above-mentioned denitrification filter tank, post-treatment BAF tank, and ozone catalytic oxidation tank are all fed with backwash water, and the backwash wastewater generated in the tank is uniformly collected in the backwash buffer tank, and is sent back to the coagulation sedimentation tank through a pipeline in the backwash buffer tank for sedimentation again to achieve the purpose of separating mud and water.

[0043] Compared with the prior art, the beneficial effects of the utility model are:

[0044] 1. Through this polycarbonate wastewater treatment system, industrial wastewater containing a large amount of organic matter, such as polycarbonate wastewater, can be treated in large quantities, and domestic sewage, initial rainwater, and wastewater discharged from circulating water plants can be treated in large flows, thereby improving the removal effect of toxic substances such as volatile phenols and formaldehyde, improving water treatment efficiency, reducing treatment costs, ensuring effluent water quality, and reducing pollution risks.

[0045] 2. By setting up a pretreatment BAF pool in the wastewater treatment system, using lightweight, high-cavity characteristic fillers and new isolation aeration components, and using the new isolation aeration components to form an internal circulation water flow in the pretreatment BAF pool, the biological filler uses the fluidity of the circulating water flow to fully fluidize, and specifically cultivates dominant microbial flora according to the characteristics of the treated wastewater itself. The formed dominant biological flora utilizes the flow of water to fully contact the wastewater, and specifically treats impurities and organic matter in the wastewater, thereby improving the ability to decompose toxic and harmful substances in the sewage, and facilitating the subsequent biochemical steps.

[0046] 3. By setting up an ozone catalytic oxidation pool, compared with other chemical oxidation methods, under the action of the catalyst, the reaction speed is fast in the water treatment process, and a large number of active non-selective hydroxyl free radicals can be produced. The hydroxyl free radicals are used to oxidize and decompose various pollutants in the wastewater, thereby improving the biodegradability of the wastewater. It has a good effect on the removal, decolorization, deodorization, and degradation of toxic pollutants in the wastewater COD, especially the removal of volatile phenols can reach more than 99%, and the oxidation products will not increase the burden of wastewater treatment; at the same time, the catalyst also has a certain adsorption effect, and the organic matter and other substances contained in the wastewater are further adsorbed and oxidized. On the basis of ensuring the wastewater treatment effect, the cost of biochemical treatment is reduced, and the amount of ozone can be flexibly changed according to the influent water quality to achieve the oxidation purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The utility model is a process flow chart of an embodiment of the present invention.

[0048] 1-accident pool, 2-homogenization regulating pool, 3-pretreatment BAF pool, 4-A pool, 5-aerobic MBBR pool, 6-biochemical sedimentation pool, 7-intermediate water pool, 8-backwash sedimentation pool, 9-biological deodorization module, 10-sludge thickening pool, 11-sludge dewatering room, 12-coagulation sedimentation pool, 13-denitrification filter, 14-post-treatment BAF pool, 15-ozone catalytic oxidation pool, 16-water collection room, 17-quartz sand filter, 18-backwash buffer pool, 19-activated carbon filter pool, 20-monitoring pool, 21-stabilization pool. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0051] Example 1

[0052] like Figure 1 As shown, this is a flow chart of a new type of polycarbonate wastewater treatment system used in this application.

[0053] The wastewater to be treated is first subjected to a preliminary water quality evaluation, and the wastewater to be treated is monitored by the water online monitoring equipment. It can be selected to enter the system from the accident pool 1 or directly into the homogenization regulating pool.

[0054] After being stored in the accident pool 1, the wastewater is discharged from the outlet of the accident pool 1, and the outlet of the accident pool 1 is connected to the inlet of the homogenization regulating pool 2 through a pipeline; the wastewater to be treated can also directly enter the homogenization regulating pool 2 for water quality adjustment treatment.

[0055] The wastewater entering the accident pool 1 and the homogenization regulating pool 2 needs to collect waste gas, and the collected gas enters the biological deodorization module 9 and is processed through the biological filter bed to meet the emission standards for discharge.

[0056] The wastewater coming out of the homogenization regulating tank enters the pretreatment BAF tank 3, and the pretreatment BAF tank 3 is externally connected to a backwash sedimentation tank 8. Backwash air distribution and circulating backwashing processes are carried out in the pretreatment BAF tank 3, and the waste gas finally discharged enters the waste gas collection pipe. The backwash wastewater enters the backwash sedimentation tank 8 from the pretreatment BAF tank 3, and the backwash wastewater flows back from the backwash sedimentation tank 8 to the pretreatment BAF tank 3 and enters the A / O biochemical treatment tank; the sludge precipitated in the backwash sedimentation tank 8 is sent to the sludge thickening tank 10.

[0057] The wastewater entering the A / O biochemical treatment pool first enters the A pool 4 to which glucose is added, the waste gas generated in the A pool 4 enters the waste gas collection pipe, and the wastewater overflows into the aerobic MBBR pool 5.

[0058] The aerobic MBBR tank 5 combines an aerobic tank with a moving bed biofilm process (MBBR), and the aerobic MBBR tank 5 includes a biological filler module, a tank body, an aeration system, and an interception screen. The aerobic MBBR tank 5 provides a growth carrier for microorganisms through suspended fillers. Since the biological fillers have a large effective surface area and are suitable for microbial attachment and growth, the suspended fillers are fully fluidized, and the basic principles of the biofilm method are used to fully utilize the advantages of the activated sludge method to achieve efficient sewage treatment. Through the aeration system, the biological fillers are fluidized by an aeration fan, and appropriate aeration and oxygenation are performed by the aeration fan to ensure the fluidization effect of the biological carrier fluidized filler, so that the fluidized filler can flow up and down and back and forth in the water body, so that the filler and sewage are fully mixed, collided, and contacted, and the pollutant adsorption process is effectively completed. The interception screen in the aerobic MBBR tank 5 is made of stainless steel, and the type is matched with the suspended filler to prevent the loss of the fluidized suspended filler.

[0059] In the aerobic MBBR pool 5, organic matter in the wastewater is oxidized and decomposed by aerobic microorganisms, and organic nitrogen is converted into nitrate ammonia through ammoniation and nitrification. The nitrified liquid flows back from the aerobic MBBR pool 5 to the A pool 4. When the wastewater passes through the A pool 4, the denitrifying bacteria in the sludge use nitrate nitrogen and CODcr in the sewage for denitrification, so that the nitrate nitrogen is converted into molecular nitrogen and escapes into the air for effective removal, thereby achieving the effect of simultaneous removal of BOD5 and denitrification.

[0060] Finally, the waste gas discharged from the A / O biochemical treatment tank enters the waste gas collection pipe, the wastewater flows into the secondary sedimentation tank, and the nitrification liquid is circulated and refluxed between the aerobic MBBR tank 5 and the A tank 4 through connection management.

[0061] The secondary sedimentation tank is the biochemical sedimentation tank 6. The wastewater entering the secondary sedimentation tank first passes through the biochemical sedimentation tank 6. A part of the precipitated activated sludge is returned to the A tank 4 through external return, and the other part is sent to the sludge thickening tank 10. The waste gas discharged from the sludge thickening tank 10 enters the waste gas collection pipe, and the concentrated sludge enters the sludge dewatering room 11. The sludge dewatering room adopts the "dosing agent + belt filter press dewatering machine" process. The filter press wastewater obtained in the sludge dewatering room 11 is recycled into the homogenization regulating tank 2. The belt filter press dewatering machine is less affected by the sludge load fluctuation, and the sludge moisture content is low. The operation is stable, the energy consumption is low, and the management and control are relatively simple. The sludge obtained by the final treatment is aerobic composting by the cooperative unit to realize resource recycling.

[0062] In the above treatment process, each part is connected with a waste gas collection pipeline to collect the malodorous waste gas in a unified manner, and the main waste gas generating ports such as the accident pool 1, the homogenization adjustment pool 2, the pretreatment BAF pool 3, the A pool 4, and the sludge concentration pool 10 are covered to prevent the leakage of the malodorous waste gas, and the collected malodorous waste gas is uniformly transported to the biological deodorization module 9. The deodorization module 9 includes a humidification component, a biological filter bed, and an exhaust pipe. The collected malodorous waste gas is humidified by the humidification component. The relative humidity of the humidified gas exceeds 98%, which is convenient for maintaining a good biological environment of the biological filter bed; the air enters the biological filter bed through the air holes of the filter plate at the bottom of the biological filter bed, passes through the biological filter bed from bottom to top, and the purified waste gas is discharged from the exhaust pipe at the outlet of the deodorization module. The height of the exhaust pipe is 16 meters.

[0063] The wastewater discharged from the secondary sedimentation tank 6 enters the intermediate water tank 7 and then enters the coagulation sedimentation tank 12, in which PAC and PAM are added to perform sedimentation and impurity removal again to remove suspended solids and phosphorus;

[0064] The coagulation sedimentation tank 12 combines a mixing tank, a reaction tank and a sedimentation tank into one. The sewage and the added medicine are mixed through the mixing tank, reacted in the reaction tank, and precipitated again in the sedimentation tank. The sludge obtained after precipitation enters the sludge thickening tank, and then enters the sludge dewatering room from the sludge thickening tank for filter pressing. The discharged wastewater enters the next stage treatment system.

[0065] The wastewater discharged from the coagulation sedimentation tank 12 enters the denitrification filter 13, and glucose is added again in the denitrification filter 13 to remove suspended solids and denitrify, etc., to ensure the treatment effect of subsequent ozone catalytic oxidation;

[0066] The wastewater treated in the denitrification filter 13 enters the post-treatment BAF tank 14, where microorganisms are used to degrade organic matter and nitrify ammonia nitrogen in an aerobic environment, and an aeration fan is used for further biochemical treatment to further degrade organic matter and nitrify ammonia nitrogen, thereby enhancing the pollutant removal effect.

[0067] The wastewater from the post-treatment BAF tank 14 flows into the ozone catalytic oxidation tank 15, which decomposes the difficult-to-degrade soluble organic pollutants in the wastewater and removes volatile phenols and soluble microbial products (SMP). After the wastewater is treated by the above-mentioned biochemical unit, a large number of biodegradable and biodegradable organic pollutants have been mostly degraded.

[0068] In order to improve the ozone treatment efficiency during this process, a catalyst is added to the ozone catalytic oxidation tank 15 to induce ozone decomposition to produce OH, and directly oxidize the organic matter therein into CO2, H2O, etc. In addition, the catalyst filler also has adsorption properties, which makes it easier for organic matter and oxidants to react, and can significantly improve mass transfer and reaction effects.

[0069] A water collection tank 16 is provided behind the ozone catalytic oxidation tank 15. The water collection tank 16, the quartz sand filter 17 and the activated carbon filter tank 19 are all connected to the monitoring water tank 20. The monitoring water tank 20 is provided with a water online monitoring device, which can monitor the water quality in real time. If the water quality in the water collection tank 16 meets the discharge requirements, it can be discharged directly through the monitoring water tank 20 and discharged into the stabilization tank 21; if it does not meet the discharge requirements, most of the reasons are that the wastewater is prone to adhere to the detached biofilm after aeration, which will cause the suspended matter concentration to increase. Therefore, the wastewater is first discharged from the water collection tank 16 into the quartz sand filter 17, and the BAF detached microorganisms and other suspended impurities are intercepted by the quartz sand filter 17 to ensure the impurity removal effect.

[0070] The quartz sand filter 17 is connected to the monitoring pool 20 and the activated carbon filter pool 19 at the same time. If the water in the monitoring pool 20 meets the discharge standard through the online water detection equipment, it will be directly discharged through the monitoring pool. If it does not meet the discharge requirements, it will pass through the activated carbon filter pool 19. The activated carbon filter pool 19 is used as a further safeguard to re-adsorb and remove organic matter in the wastewater. At the same time, when the water inlet shock is large or the water quality fluctuates greatly, the activated carbon filter pool 19 can be used as a transition device to ensure the stability of the effluent water quality.

[0071] The denitrification filter 13, post-treatment BAF tank 14, and ozone catalytic oxidation tank 15 involved in the above process are all fed with backwash water, and the backwash water is provided by the monitoring water tank 20. The backwash wastewater generated in the tank is uniformly collected in the backwash buffer tank 18, and is sent back to the coagulation sedimentation tank 12 through a pipeline in the backwash buffer tank 18 for further treatment, thereby achieving the effect of separating mud and water.

[0072] Example 2

[0073] The polycarbonate wastewater taken from an enterprise in Tianjin was treated using the polycarbonate wastewater treatment system in Example 1.

[0074] Before the wastewater enters the polycarbonate wastewater treatment system, it must meet the water quality indicators shown in Table 1:

[0075] Table 1 Water quality indicators of influent of polycarbonate wastewater treatment system

[0076]

[0077]

[0078] The polycarbonate wastewater treatment system as described in Example 1 is used to treat the polycarbonate wastewater. The polycarbonate wastewater enters the homogenization regulating tank 2 through the outlet pipe of the water online monitoring device, is treated by the polycarbonate wastewater treatment system, and is detected by the water online detection device in the monitoring water tank 20. The discharged wastewater standard is shown in Table 2:

[0079] Table 2 Water quality indicators of effluent from polycarbonate wastewater treatment system

[0080] Serial number Pollutant Name Water Quality unit 1 Suspended solids (SS) ≤5 mg / L 2 <![CDATA[BOD5]]> ≤6 mg / L 3 COD ≤30 mg / L 4 Ammonia nitrogen (NH3-N) ≤1.5(3) mg / L 5 Total Nitrogen (TN) ≤10 mg / L 6 Total Phosphorus (TP) ≤0.3 mg / L 7 Chroma 15 Dilution multiple 8 pH 6～9 /

[0081] After the polycarbonate wastewater was treated using the polycarbonate wastewater treatment system, the content of volatile phenols detected in the discharged wastewater was lower than 0.3 mg / L, which meets the daily average emission requirements of volatile phenols in Standard A of Tianjin's "Pollutant Discharge Standards for Urban Sewage Treatment Plants" DB12 / 599-2015. At the same time, the removal effect of CODcr, BOD5 and organic matter in the discharged wastewater is obvious.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A polycarbonate wastewater treatment system, characterized in that: After being monitored by an online monitoring device, the wastewater to be treated is introduced into the polycarbonate wastewater treatment system, wherein the polycarbonate wastewater treatment system is provided with a homogenization regulating tank (2), a pretreatment BAF tank (3), an A / O biochemical treatment tank, a secondary sedimentation tank, a coagulation sedimentation tank (12), a denitrification filter tank (13), a post-treatment BAF tank (14), an ozone catalytic oxidation tank (15), a quartz sand filter (17), an activated carbon filter tank (19), and a monitoring water tank (20) which are sequentially connected by pipelines.

2. A polycarbonate wastewater treatment system as claimed in claim 1, characterized in that: The water inlet of the homogenizing regulating tank (2) is connected to the water inlet pipe of the wastewater to be treated through a pipeline, and an accident pool (1) is also arranged in front of the homogenizing regulating tank (2); the wastewater in the accident pool (1) and the homogenizing regulating tank (2) needs to be subjected to waste gas collection, and the waste gas is collected by the waste gas collection pipe, and the wastewater discharged from the homogenizing regulating tank (2) enters the pretreatment BAF tank (3) through the pipeline from the water inlet of the pretreatment BAF tank (3).

3. A polycarbonate wastewater treatment system as claimed in claim 2, characterized in that: The water outlet end of the pretreatment BAF pool (3) is connected to the water inlet end of the A / O biochemical treatment pool and the water inlet end of the backwash sedimentation pool (8) through pipelines, and the waste gas discharged from the pretreatment BAF pool (3) enters the waste gas collection pipeline.

4. A polycarbonate wastewater treatment system as claimed in claim 3, characterized in that: The A / O biochemical treatment pool comprises an A pool (4) and an aerobic MBBR pool (5); the A pool (4) is provided with a drug addition port, and the aerobic MBBR pool (5) is provided with a biological filler module, a pool body, an aeration system, and an interception screen; the waste gas discharged from the A / O biochemical treatment pool enters a waste gas collection pipeline, and the nitrification liquid circulates and refluxes through a delivery pipeline between the aerobic MBBR pool (5) and the A pool (4).

5. A polycarbonate wastewater treatment system as claimed in claim 1, characterized in that: The secondary sedimentation tank is the biochemical sedimentation tank (6). The sludge in the biochemical sedimentation tank (6) and the backwash sedimentation tank (8) first passes through the sludge concentration tank (10) and then enters the sludge dewatering room (11) through the connecting pipe. The waste gas is collected through the waste gas collection pipe, the filter wastewater is sent back to the homogenization regulating tank (2), and the sludge is discharged through the pipeline.

6. A polycarbonate wastewater treatment system as claimed in any one of claims 2 to 5, characterized in that: The waste gas collection pipeline is connected to a biological deodorization module (9), and the deodorization module (9) is provided with a humidification component, a biological filter bed, and an exhaust pipe; The exhaust chimney is 16 meters high.

7. A polycarbonate wastewater treatment system as claimed in claim 1, characterized in that: The coagulation sedimentation tank (12) is an inclined plate sedimentation tank.

8. A polycarbonate wastewater treatment system as claimed in claim 1, characterized in that: A water collection pool (16) is also provided between the ozone catalytic oxidation pool (15) and the quartz sand filter (17); the water outlet of the water collection pool (16) is connected to the water inlet of the monitoring water pool (20) and the water inlet of the quartz sand filter (17) through pipelines; the water outlet of the quartz sand filter (17) is connected to the water inlet of the monitoring water pool (20) and the activated carbon filter pool (19) through pipelines; the water outlet of the activated carbon filter pool (19) is connected to the water inlet of the monitoring water pool (20) through a pipeline.

9. A polycarbonate wastewater treatment system as claimed in claim 8, characterized in that: The monitoring water pool (20) is further provided with water online monitoring equipment. The water outlet end of the monitoring water pool (20) is connected to the water inlet of the stabilization pool (21) through a pipeline. The stabilization pool (21) is provided with a water outlet.

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