CN205635243U - Vitamin C waste water advanced treatment unit - Google Patents

Abstract

The utility model relates to a sewage treatment technical field, special design is to the vitamin C waste water's through the processing of traditional sewage treatment method sewage advanced treatment unit. Does the device include that the one -level is by the oxygen deficiency the anaerobism the biological membrane bioreactor that good oxygen is constituteed, is the one -level by the oxygen deficiency biological membrane bioreactor and two -stage ozone that good oxygen is constituteed the unsteady biological pond of bed to make the oxygen deficiency through methods such as backward flows the anaerobism good oxygen obtains the coupling effect. The beneficial effects are that oxygen deficiency through the coupling the anaerobism good oxygen fluctuation freight elevator degrades the difficult degradation pollutant through reinforceing biochemical method, carry out the oxidation modification to the pollutant that still can not degrade and passing through biochemical degradation, thereby obtain innoxious advanced wastewater treatment result with the most economic biochemical reactions, it reaches the national municipal one -level A emission standard of china with the processing of vitamin C waste water to strengthen biochemical (OEB) process through multistage compound space biofilm reactor (MCM) and multistage oxidation.

Description

Vitamin C production wastewater advanced treatment device

technical field

The utility model relates to the technical field of sewage treatment, in particular to an advanced treatment method for sewage that cannot be discharged up to standard after being treated by a traditional sewage device, especially for the further treatment of vitamin C production wastewater treated by a traditional sewage device to meet the discharge standard advanced sewage treatment methods.

technical background

Traditional sewage treatment plants are generally based on the activated sludge process. The types and activities of microorganisms in the activated sludge process are limited, so some organic matter is difficult to degrade, which affects the treatment effect. Traditional sewage treatment technology usually refers to organic matter that is difficult to be degraded by activated sludge as "refractory organic matter" or non-biodegradable organic matter. For municipal sewage containing industrial wastewater, or for industrial wastewater, a large amount of "refractory organic matter" will remain through traditional sewage treatment, which is difficult to meet the discharge standards or subsequent reuse process requirements. The wastewater produced by vitamin C production has the characteristics of large wastewater volume, high pollution concentration, and high salt content. It is difficult to meet urban discharge standards with traditional sewage treatment methods.

At the end of the last century, the United States closed all production plants in its territory due to problems such as the difficulty in dealing with waste water from vitamin C production. At present, China has become the vitamin C production center in the world. The chemical oxygen demand (COD) of common vitamin C production wastewater is above 10,000mg/L. After strong treatment, the production enterprise can reduce the COD to below 500mg/L, which meets the standard for industrial enterprises to discharge to urban sewage treatment plants. However, these remaining COD are almost all "refractory organic matter", coupled with high nitrogen pollutants, high hardness and salt content exceeding 1%, traditional urban sewage treatment plants are helpless. Some experts believe that this is a "world problem" facing the field of human sewage treatment. It will be a major issue of life and death for many similar enterprises in China to treat this kind of industrial production sewage to the standard. It is necessary to develop advanced sewage treatment technology and methods (Acute Waste Water Treatment, AWWT) on the basis of traditional sewage treatment.

Advanced sewage treatment (AWWT) technology refers to the sewage treatment technology used when the sewage after traditional sewage treatment contains a relatively high concentration of "refractory organic matter" and needs further treatment. The main application fields of sewage advanced treatment technology include: (1) The sewage treated by traditional methods cannot meet the discharge standards and needs advanced treatment (including upgrading and transformation); (2) The sewage treated by traditional methods cannot meet the influent requirements of the reuse process , requires advanced treatment; (3) In order to make the tail water of the reuse process meet the discharge requirements, carry out advanced treatment on the sewage or the tail water of the reuse process.

Common advanced sewage treatment technologies include a variety of methods. Among them, the common Fenton reagent method is a chemical method, which consumes a large amount of chemicals, produces a large amount of chemical sludge, and has high operating costs. Since the Fenton reagent method mainly removes pollutants by flocculation and precipitation, the treatment effect on pollutants with larger molecules is better, but the treatment effect on pollutants with smaller molecules is limited. Membrane bioreactor (MBR) can also be used as an advanced sewage treatment method, but since the MBR method still focuses on activated sludge, the space for further reducing "refractory organic matter" is limited. Biofilm biochemical sewage advanced treatment method (Bio-Film Bio-reaction, BFB) and oxidation enhanced biochemical method (Oxidation Enhanced Bio-reaction, OEB) will not produce a large amount of chemical sludge, and the operation energy consumption is low, which is relatively green and environmentally friendly method.

In fact, whether organic pollutants can be biodegraded is related to the type and population composition of microorganisms. If more abundant and targeted microbial populations can be cultivated, some organic substances that are "refractory to degradation" by conventional methods may become " easily degradable organic matter. Therefore, creating conditions for the cultivation of more abundant microorganisms is one of the directions for eliminating "refractory organic matter".

Chinese patent "composite biofiller and its bioreactor" (201020204406.9) discloses a composite void biofiller (Multi-C avity Media , MCM), which includes a hard mesh shell and two kinds of above the media block. Due to the large gaps between the shells, the small gaps between the media blocks, and the micro gaps in the media blocks; the significant difference in the air-water mixing and exchange conditions in the large gaps, small gaps and micro gaps results in significant differences in dissolved oxygen. In-situ coupling of aerobic, anoxic and anaerobic can be realized. At the same time, a typical combination of medium blocks is a combination of microporous coke or charcoal blocks and volcanic rocks. This combination is characterized by low redox potentials of coke blocks or charcoal blocks, while iron oxide components in volcanic rocks have high redox potentials. Different microorganisms can choose different medium surfaces to inhabit.

Chinese patent (200710195135.8) discloses a biofilm reactor, in which MCM is first used to realize in-situ coupling of aerobic, anoxic and anaerobic. Under the action of the air-lifting circulation flow, multi-stage aerobic, anoxic and anaerobic reactor couplings are realized in the reactor. The above biofilm reactor technology provides a technical basis for cultivating more abundant and targeted microbial populations to degrade "refractory organic matter". At the same time, due to the existence of various microorganisms, simultaneous digestion/denitrification and simultaneous degradation of remaining biological sludge can be realized.

However, when similar technologies are used for more difficult-to-degrade pollutants, especially for the treatment of vitamin C tail water, a single method is not enough to meet the sewage treatment standards, and multiple couplings of multiple biological reaction processes are required.

After multiple coupled biofilm biochemical wastewater advanced treatment, there are still some "refractory organic matter" that are difficult to be biodegraded. Strong oxidants can be used to oxidize these "refractory organic substances", change their chemical properties, improve their biodegradability, and then carry out biochemical treatment. This process may be referred to as oxidation-enhanced biochemical reaction (OEB).

Utility model content

The utility model aims to solve the technical problem that the traditional sewage treatment method cannot meet the treatment requirements after treating refractory sewage, especially for the technical problem that vitamin C production wastewater such as vitamin C production wastewater is difficult to be treated to meet the standard discharge, and reveals a sewage depth processing technology.

In order to solve the above-mentioned technical problems, the vitamin C production wastewater advanced treatment device sequentially includes a first water inlet, a coagulation sedimentation tank, a first biofilm anoxic reaction tank, a first biofilm anaerobic reaction tank, a first biofilm Aerobic reaction tank, primary lift pump, second biofilm anoxic reaction tank, second biofilm aerobic reaction tank, secondary lift pump, second coagulation sedimentation tank, first oxidation reaction tank, first floating bed Biological pool, second oxidation reaction pool, second floating bed biological pool, water production interface; also includes oxygen/anoxic backwash fan, aerobic operation fan, floating bed biological pool backwash fan, floating bed biological pool operation fan, Ozone generator, necessary valves, instruments and automatic control system; the bottom of the first coagulation sedimentation tank and the second coagulation sedimentation tank are equipped with mud discharge pipes, the first biofilm anoxic reaction tank, the first biofilm anaerobic The bottom of the oxygen reaction tank and the second biofilm anoxic reaction tank is equipped with an air washing aeration device, and the bottom of the first biofilm aerobic reaction tank and the second biofilm aerobic reaction tank is equipped with an aerobic aeration device, wherein the first A plurality of ozone aeration devices are provided at the bottom of the oxidation reaction tank and the second oxidation reaction tank, wherein the first floating bed biological tank and the second floating bed biological tank have an air-water distribution device at the bottom; the first biofilm aerobic reaction Part of the water produced in the pool is returned to the first biofilm anoxic reaction tank through the primary lift pump and the first return pipeline, and part of the produced water in the second biofilm aerobic reaction tank is returned to the second biofilm aerobic reaction tank through the second lift pump and the second return pipeline. Return to the second biofilm anoxic reaction tank, and part of the produced water from the second biofilm aerobic reaction tank is returned to the first biofilm anoxic reaction tank through the secondary lift pump and the third return pipeline.

The beneficial effect of this vitamin C production wastewater advanced treatment method is that the microorganisms parasitic on the biological filler are fixed in a specific pool, and the dominant bacterial species in the first biofilm aerobic reaction pool and the second biofilm aerobic reaction pool are based on the composition of pollutants. Variations and differences in dissolved oxygen (which can be controlled). In the same way, the dominant bacterial species in the first biofilm anoxic reaction tank, the first biofilm anaerobic reaction tank and the second biofilm anoxic reaction tank are different with the change of pollutant composition and the difference of dissolved oxygen, precisely because these microorganisms Various "refractory organic pollutants" are gradually degraded under the action of special microorganisms. Another beneficial effect of the vitamin C production wastewater advanced treatment device is to use biological fillers to realize the in-situ coupling of anoxic and aerobic reactions, and then to realize the anoxic reaction between the biological reaction tanks through the backflow of the aerobic tank to the anoxic tank of the previous stage. and aerobic coupling. One of these hypoxic and aerobic coupling effects is that anoxic reaction products can be degraded aerobically, and aerobic reaction products can be degraded by anoxic reactions; subsequent stage reaction products may be degraded again by previous stages; The sludge is returned and gradually degraded, so that the amount of biological sludge is significantly reduced. Another beneficial effect of the vitamin C production wastewater advanced treatment device is to select fillers with special functions. Another beneficial effect of the vitamin C production waste water advanced treatment device is that nutrients required for degrading refractory pollutants can be selectively added when necessary. Another beneficial effect of the vitamin C production wastewater advanced treatment device is to achieve "limited oxidation" modification of "refractory organic pollutants" after the biofilm reaction by adding a small amount of oxidant several times, and then use the subsequent floating bed biological pool to degrade These denature pollutants and are therefore more efficient as oxidizers. Vitamin C production wastewater was treated to meet China's national municipal Class A discharge standard through a multi-stage composite void biofilm reactor (MCM) and a multi-stage oxidation-enhanced biochemical (OEB) process. Experiments have proved that the device and method have extensive effects on the advanced treatment of many refractory sewage.

Description of drawings

Figure 1 is a schematic flow diagram of the advanced treatment device for vitamin C production wastewater.

In the figure, 10. the first water inlet interface, 11. the second water inlet interface, 20. the water production interface, 30. the sludge discharge pipe, 50. the carbon source adding device, 110. the first coagulation sedimentation tank, 120. the first Biofilm anoxic reaction tank, 130. The first biofilm anaerobic reaction tank, 140. The first biofilm aerobic reaction tank, 150. Primary lift pump, 151. The first return pipeline, 160. The second biofilm Anoxic reaction tank, 170. The second biofilm aerobic reaction tank, 180. Secondary lift pump, 181. The second return pipeline, 182. The third return pipeline, 200. The second coagulation sedimentation tank, 310. The first An oxidation reaction pool, 320. the first floating bed biological pool, 330. the second oxidation reaction pool, 340. the second floating bed biological pool, 510. anaerobic and anoxic backwash fan, 511. air washing aeration device, 520. Aerobic operation fan, 521. Aerobic aeration device, 530. Biological aerated filter backwash fan, 531. Air-water distribution device, 540. Floating bed biological pool operation fan, 541. Floating bed biological pool operation aeration gas device, 600. ozone generating device, 601. ozone aeration device. For simplicity, necessary valves, instruments and automatic control systems are omitted in the figure.

detailed description

As shown in Fig. 1, the present vitamin C production waste water advanced treatment device is characterized in that comprising successively the first water inlet interface (10), the first coagulation sedimentation tank (110), the first biofilm anoxic reaction tank (120) , the first biofilm anaerobic reaction tank (130), the first biofilm aerobic reaction tank (140), the primary lift pump (150), the second biofilm anoxic reaction tank (160), the second biofilm well Oxygen reaction tank (170), secondary lift pump (180), second coagulation sedimentation tank (200), first oxidation reaction tank (310), first floating bed biological tank (320), second oxidation reaction tank ( 330), the second floating bed biological pool (340), water production interface (20); also includes oxygen/anoxic backwash fan (510), aerobic operation fan (520), floating bed biological pool backwash fan (530 ), floating bed biological pool operation fan (540), ozone generator (600), necessary valves, instruments and automatic control systems; wherein the first coagulation sedimentation tank (110) and the second coagulation sedimentation-biofilm anaerobic Reaction tank (130) and two biofilm anoxic reaction tanks (160) bottom are provided with air washing aeration device (511), wherein the first biofilm aerobic reaction tank (140) and the second biofilm aerobic reaction tank ( 170) The bottom is provided with an aerobic aeration device (521), wherein a plurality of ozone aeration devices (601) are provided at the bottom of the first oxidation reaction tank (310) and the second oxidation reaction tank (330), wherein the first floating bed An air-water distribution device (531) is provided at the bottom of the bio-pool (320) and the second floating-bed bio-pool (340); wherein part of the water produced in the first biofilm aerobic reaction pool (140) passes through the primary lift pump (150) and The first return line (151) is returned to the first biofilm anoxic reaction tank (120), and part of the water produced in the second biofilm aerobic reaction tank (170) passes through the secondary lift pump (180) and the second return pipe Road (181) is returned to the second biofilm anoxic reaction tank (160), and part of the water produced in the second biofilm aerobic reaction tank (170) passes through the secondary lift pump (180) and the third return line (182) It is returned to the biofilm anoxic reaction tank (120).

The vitamin C production wastewater advanced treatment device also includes a second water inlet interface (11) for supplying raw water to the second biofilm anoxic reaction tank (160), and the interface can use the raw water to provide a carbon source for denitrification.

The vitamin C production wastewater advanced treatment device also includes a carbon source adding device (50) for supplying a carbon source to the second biofilm anoxic reaction tank (160), and the device provides a carbon source for deep denitrification when the raw water carbon source is insufficient.

The first biofilm anoxic reaction tank (120), the first biofilm anaerobic reaction tank (130), the first biofilm aerobic reaction tank (140), and the first-stage lift pump (150) of the vitamin C production wastewater advanced treatment device ), the second biofilm anoxic reaction tank (160), and the second biofilm aerobic reaction tank (170) add composite void biofillers.

The first floating bed biological pond (320) and the second floating bed biological pond (340) of the vitamin C production wastewater advanced treatment device contain activated carbon fillers.

Example

Using this vitamin C production wastewater advanced treatment device, the biochemically treated vitamin C production wastewater is used for advanced treatment. After more than half a year of debugging and stable operation, the final 10-day test data of the third party during the official calibration assessment period is as follows:

Unit: mg/L

The assessment results have reached China's national first-level emission standards stably.

Claims (5)

1. a wastewater from vitamin C production advanced treatment apparatus, it is characterised in that include successively the first water inlet interface (10), first Coagulative precipitation tank (110), the first biomembrane hypoxia response pond (120), the first biological membrane anaerobic reaction tank (130), the first biology Film aerobic reaction pond (140), one-level elevator pump (150), the second biomembrane hypoxia response pond (160), the second biomembrane are aerobic instead Ying Chi (170), two-stage hoisting pump (180), the second coagulative precipitation tank (200), the first oxidation reaction pond (310), the first flotation bed Biological tank (320), the second oxidation reaction pond (330), the second flotation bed biological tank (340), product water interface (20)；Also include oxygen/ Anoxia backwash blower fan (510), aerobic operation blower fan (520), flotation bed biological tank backwash blower fan (530), flotation bed biological tank are transported Sector-style machine (540), ozonator (600), necessary valve, instrument and automatic control system；Wherein the first coagulative precipitation tank (110) and the second coagulative precipitation tank (200) bottom is provided with discharge pipeline (30), wherein the first biomembrane hypoxia response pond (120), the One biomembrane anaerobic reation pool (130) and bottom, two biomembrane hypoxia response ponds (160) are provided with air purge aerator (511), its In the first biomembrane aerobic reaction pond (140) and the second biomembrane aerobic reaction pond (170) bottom be provided with aerobic aeration device (521), wherein the first oxidation reaction pond (310) and bottom, the second oxidation reaction pond (330) are provided with multiple ozonation aerated device (601), wherein the first flotation bed biological tank (320) and the second flotation bed biological tank (340) bottom are provided with water-gas distribution device (531)；Wherein the first biomembrane aerobic reaction pond (140) part produces water through one-level elevator pump (150) and the first reflux pipe (151) being back to the first biomembrane hypoxia response pond (120), the second biomembrane aerobic reaction pond (170) part produces water through two Level elevator pump (180) and the second reflux pipe (181) are back to the second biomembrane hypoxia response pond (160), the second biomembrane Aerobic reaction pond (170) part is produced water and is back to the with biomembrane through two-stage hoisting pump (180) and the 3rd reflux pipe (182) Hypoxia response pond (120).

Wastewater from vitamin C production advanced treatment apparatus the most according to claim 1, it is characterised in that also include to second raw Thing film hypoxia response pond (160) is for the second water inlet interface (11) of former water.

Wastewater from vitamin C production advanced treatment apparatus the most according to claim 1, it is characterised in that also to the second biomembrane Hypoxia response pond (160) is for charcoal source adding set (50) in charcoal source.

Wastewater from vitamin C production advanced treatment apparatus the most according to claim 1, it is characterised in that the first biomembrane anoxia Reaction tank (120), the first biological membrane anaerobic reaction tank (130), the first biomembrane aerobic reaction pond (140), one-level elevator pump (150), the second biomembrane hypoxia response pond (160), the second biomembrane aerobic reaction pond (170) comprise composite gap biological to fill out Material.

Wastewater from vitamin C production advanced treatment apparatus the most according to claim 1, it is characterised in that the first flotation bed is biological Pond (320) and the second flotation bed biological tank (340) comprise active carbon filler.