Search

CN-121974524-A - Modularized food processing wastewater treatment device and treatment method

CN121974524ACN 121974524 ACN121974524 ACN 121974524ACN-121974524-A

Abstract

The invention discloses a modularized device and a method for treating food processing wastewater, and belongs to the field of wastewater treatment. The invention discloses a modularized food processing wastewater treatment device, which comprises a box body, wherein a pretreatment module, a coagulation air floatation module, a UASB biological treatment module and a subsequent treatment module are sequentially and serially arranged in the water grinding direction in the box body, the coagulation air floatation module comprises a coagulation flocculation tank, a dissolved air pressurization tank and an air floatation tank which are sequentially communicated, the subsequent treatment module comprises an anaerobic primary sedimentation tank, an aerobic reaction tank and a secondary sedimentation tank which are sequentially communicated, the aerobic reaction tank consists of a plurality of serially connected aerobic units, the invention adapts to the different-scale food processing wastewater treatment requirements from a small workshop to a large-scale factory, the occupied area is only 60% -70% of that of the traditional device, the installation is convenient, the COD removal rate after treatment is more than or equal to 98%, the grease removal rate is more than or equal to 98%, and the effluent accords with the emission standard.

Inventors

  • DENG BANGWU
  • ZHAO FENGSHOU
  • CHEN PENG

Assignees

  • 安徽舜禹水务股份有限公司

Dates

Publication Date
20260505
Application Date
20260304

Claims (10)

  1. 1. The modularized food processing wastewater treatment device comprises a box body and is characterized in that a pretreatment module, a coagulation air floatation module, a UASB biological treatment module and a subsequent treatment module are sequentially connected in series in the water flow direction of the grinding water in the box body; the coagulation and air floatation module comprises a coagulation and flocculation tank (2), a dissolved air pressurization tank (3) and an air floatation tank (4) which are sequentially communicated, wherein a dissolved air pressurization device (301) for realizing air-water dissolution is arranged in the dissolved air pressurization tank (3); the UASB biological treatment module comprises a UASB pool (5) communicated with the air floatation pool (4); The subsequent treatment module comprises an anaerobic primary sedimentation tank (6), an aerobic reaction tank (7) and a secondary sedimentation tank (8) which are sequentially communicated, wherein the aerobic reaction tank (7) is composed of a plurality of aerobic units which are connected in series.
  2. 2. The modularized food processing wastewater treatment device according to claim 1, wherein the pretreatment module comprises a pretreatment tank (1), microporous aeration plates (702) are arranged in the pretreatment tank (1) and an aerobic reaction tank (7), a first sludge discharge opening (9) is arranged on the air floatation tank (4), and a second sludge discharge opening (901) is arranged at the bottoms of the pretreatment tank (1), the coagulation flocculation tank (2) and the dissolved air pressurization tank (3).
  3. 3. The modularized food processing wastewater treatment device according to claim 1, wherein a stirrer (201) is arranged in the coagulation flocculation tank (2), an air flotation separation system, a slag discharging system and a water collector are arranged in the air flotation tank (4), an air flotation slag scraping machine (401) is arranged at the top of the air flotation tank (4), a third sludge discharge port (902) is arranged at the bottom of the air flotation tank (4), and micro bubbles in the air flotation tank (4) are combined with pollutants to float upwards to form scum, and the scum is scraped and discharged by the air flotation slag scraping machine (401).
  4. 4. The food processing wastewater treatment modularized device according to claim 2, wherein a first water distribution pipe (502) communicated with the air floatation tank (4) is arranged at the bottom of the UASB tank (5), a double three-phase separator (501) is arranged at the upper part of the UASB tank (5), a polyurethane heat-insulating layer is wrapped on the outer side of the UASB tank (5), and a sludge backflow channel is arranged on the outer side of the UASB tank (5).
  5. 5. The modularized food processing wastewater treatment device according to claim 4, wherein the anaerobic primary sedimentation tank (6) is used for receiving the effluent of the UASB tank (5) so as to realize solid-liquid separation, and the bottoms of the anaerobic primary sedimentation tank (6), the aerobic reaction tank (7) and the secondary sedimentation tank (8) are respectively provided with a fourth sludge discharge port (903).
  6. 6. The modularized food processing wastewater treatment device according to claim 5, wherein a baffle plate with an internal aerobic combined filler (701) is arranged in the aerobic unit, a second water distribution pipe (703) is arranged at the bottom of the baffle plate, microporous aeration plates (702) for degrading residual organic matters are arranged in the pretreatment tank (1) and below the baffle plate, and water outlets (11) are arranged at the tops of the anaerobic primary sedimentation tank (6), the aerobic reaction tank (7) and the secondary sedimentation tank (8).
  7. 7. The modularized food processing wastewater treatment device according to claim 1, wherein a first guide cylinder (10) is arranged in the dissolved air pressurizing tank (3), a second guide cylinder (1001) is arranged in the anaerobic primary sedimentation tank (6), and a third guide cylinder (1002) is arranged in the secondary sedimentation tank (8).
  8. 8. A method of treating food processing wastewater comprising the modular food processing wastewater treatment apparatus of any one of claims 4-6, implemented according to the steps of: step one, a pretreatment stage; step two, a coagulation air floatation stage; Adding 100-200mg/L PAC and 5-10mg/L PAM into a coagulation flocculation tank (2) in sequence, firstly, rapidly stirring for 2-5min at the stirring speed of 300-400r/min, then slowly stirring for 10-20min at the stirring speed of 50-100r/min to form flocs, then, flowing the wastewater into a dissolved air pressurizing tank (3) to prepare dissolved air water under the pressure of 0.3-0.4MPa, and enabling the dissolved air water to flow back to the reflux ratio of 30% -50%, then, entering an air floatation tank (4), combining micro bubbles with the flocs to float upwards to form scum, discharging, collecting lower-layer clear water, overflowing to the UASB tank (5), and periodically discharging sludge at the bottom of the air floatation tank (4); Step three, a UASB biological treatment stage; The UASB pool (5) stays for a period of time to anaerobically degrade high-concentration organic matters in the wastewater, and effluent overflows to the anaerobic primary sedimentation pool (6); Step four, an aerobic advanced treatment stage; And fifthly, sludge treatment and effluent discharge.
  9. 9. The method for treating food processing wastewater according to claim 8, wherein the specific steps of the pretreatment stage are that the food processing wastewater flows into a pretreatment tank (1), 50-100mg/L of ferrite agent is added, aeration is carried out at the intensity of 0.5-1.0m < 3 >/(m < 2 >. H), oxidation reaction is carried out for 1-2h, organic matters are primarily decomposed, demulsification and oil removal are carried out, and the effluent enters a coagulation flocculation tank (2).
  10. 10. The food processing wastewater treatment method according to claim 8, wherein the UASB biological treatment stage in the third step comprises the specific steps of maintaining the temperature in a UASB tank (5) at 30-35 ℃ and the rising flow rate at 0.6-1.0m/h for 8-12h, anaerobically degrading high-concentration organic matters in wastewater by high-concentration granular sludge, collecting and guiding generated methane gas by a double three-phase separator (501), supplementing granular sludge by a sludge backflow channel arranged on the outer side, maintaining the concentration at 30-50g/L, and overflowing effluent to an anaerobic primary sedimentation tank (6); The specific steps of the aerobic advanced treatment stage in the fourth step are that the anaerobic primary sedimentation tank (6) stays for 1-2h, after solid-liquid separation is realized, effluent overflows to the aerobic reaction tank (7), the aerobic reaction tank (7) stays for 8-12h, DO concentration is maintained to be 2mg/L, the effluent overflows to the secondary sedimentation tank (8), the effluent stays for 1-2h for solid-liquid separation, and the surface load is controlled to be 1-2m < 3 >/(m < 2 >. H); The specific steps of sludge treatment and effluent discharge in the fifth step are that clear water at the upper part of the secondary sedimentation tank (8) is directly discharged, partial bottom sludge flows back to the UASB tank (5) and the aerobic reaction tank (7), and the residual sludge and sludge discharged by the tanks enter a sludge treatment module together and are treated after concentration and dehydration.

Description

Modularized food processing wastewater treatment device and treatment method Technical Field The invention relates to the technical field of wastewater treatment, in particular to a modularized device and a modularized method for treating food processing wastewater. Background The wastewater produced in the food processing industry has the characteristics of high COD (chemical oxygen demand), high SS (suspended solids) and high grease content, and the fluctuation of the water quality and the water quantity along with the production batch and the seasonal variation is remarkable, and if the wastewater is directly discharged, the eutrophication of the receiving water body, the reduction of dissolved oxygen and the destruction of ecological balance are caused, so that the safety of the water environment is seriously threatened. At present, a coagulation air floatation-UASB combined process is a common technology for treating the high-concentration organic wastewater, but the prior application scheme has the following prominent defects: (1) The device has no standardized module design, the processing capacity can not be flexibly adjusted according to the scale of a food factory, the capacity expansion is required to be integrally reconstructed and reduced to be configured as equipment is idle, and the adaptability is extremely poor; (2) The food waste water has high grease and SS content, the grease concentration can reach 500-1000mg/L, the SS concentration can reach 800-1500mg/L, and the food waste water is easy to be attached and deposited in a UASB reactor, so that the overload of the reactor and the loss of granular sludge are caused, and the treatment efficiency is reduced by 30% -50%; (3) Depending on manual monitoring of water quality parameters, adjustment of dosage, aeration intensity and the like, response is delayed, generally 2-4 hours later, sudden fluctuation of water quality and water quantity is difficult to cope with, and water is easy to be discharged and does not reach the standard; (4) The device has the advantages of dispersed structure or huge volume, large occupied area, field installation, large amount of civil engineering and pipeline welding, period as long as 15-30 days, and inadaptability to the requirements of narrow workshop and short installation period of a food factory; (5) UASB reactor is sensitive to temperature, suitable temperature is 30-35 ℃, treatment efficiency suddenly drops under low temperature environment (< 15 ℃) and lack of emergency pH adjusting mechanism, anaerobic sludge activity is lost easily when the pH of the inlet water is abnormal. Therefore, there is a need to develop a device and a method for treating food processing wastewater, which are modularized, have strong pertinence, are intelligent, and have good impact resistance, so as to solve the above-mentioned technical problems. Disclosure of Invention The invention aims to solve the problems in the prior art and provides a modularized device and a method for treating food processing wastewater. In order to achieve the above purpose, the present invention adopts the following technical scheme: a modularized food processing wastewater treatment device comprises a box body, wherein a pretreatment module, a coagulation air floatation module, a UASB biological treatment module and a subsequent treatment module are sequentially connected in series in the water flow direction of grinding in the box body; the coagulation air floatation module comprises a coagulation flocculation tank, a dissolved air pressurization tank and an air floatation tank which are sequentially communicated, wherein a dissolved air pressurization device for realizing air-water dissolution is arranged in the dissolved air pressurization tank; The UASB biological treatment module comprises a UASB pool communicated with the air floatation pool; the subsequent treatment module comprises an anaerobic primary sedimentation tank, an aerobic reaction tank and a secondary sedimentation tank which are sequentially communicated, wherein the aerobic reaction tank consists of a plurality of aerobic units which are connected in series. Preferably, the pretreatment module comprises a pretreatment tank, microporous aeration plates are arranged in the pretreatment tank and the aerobic reaction tank, a first sludge discharge port is arranged on the air floatation tank, and second sludge discharge ports are arranged at the bottoms of the pretreatment tank, the coagulation flocculation tank and the dissolved air pressurizing tank. Preferably, the coagulation flocculation tank is internally provided with a stirrer, the air floatation tank is internally provided with an air floatation separation system, a slag discharging system and a water collector, the top of the air floatation tank is provided with an air floatation slag scraping machine, the bottom of the air floatation tank is provided with a third sludge discharging port, and micro bubbles in the air fl