CN213924402U

CN213924402U - Pesticide chemical industry garden sewage degree of depth processing system

Info

Publication number: CN213924402U
Application number: CN202021117969.4U
Authority: CN
Inventors: 蔡剑; 任明信; 苏小耀
Original assignee: Hynar Water Group Corp
Current assignee: Hynar Water Group Corp
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-08-10
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses a pesticide chemical industry garden sewage advanced treatment system, including preprocessing device, catalytic oxidation pond, biological filter and disinfection pond, sewage loops through preprocessing device, catalytic oxidation pond, biological filter and disinfection pond and can carry out advanced treatment and reach sewage discharge standard. The utility model discloses a pesticide chemical industry garden sewage advanced treatment system mainly goes out water to the biochemical treatment of pesticide industrial garden sewage plant, adopts coagulating sedimentation, hydrogen peroxide solution ozone, bological aerated filter and ozone disinfection pond combined process advanced treatment pesticide chemical industry garden waste water, can the organic matter of effectual degradation pesticide waste water, improves waste water biodegradability to utilize the ozone of loss, disinfect waste water.

Description

Pesticide chemical industry garden sewage degree of depth processing system

Technical Field

The utility model belongs to the technical field of sewage treatment, concretely relates to pesticide chemical industry garden sewage degree of depth processing system.

Background

At present, the pesticide industry in China is continuously developed, and the environmental problems caused by the stage increment of sewage quantity in a garden and the particularity of water quality in the garden in the pesticide industry are increasingly prominent. The wastewater discharged from the pesticide chemical industry park has the following characteristics: (1) the wastewater discharge of each enterprise in the pesticide chemical industry park is irregular, and the water quality and the water quantity fluctuate greatly. (2) The wastewater in the pesticide chemical industry park has complex water quality, often contains refractory organic matters such as chloropyridine compounds and heterocyclic compounds, and the biodegradability of the wastewater after the initial treatment of each enterprise is poor. (3) The waste water contains a large amount of toxic substances which inhibit the growth of microorganisms. If the depth of the pesticide wastewater cannot be effectively increased, the pesticide wastewater may have a serious influence on the surrounding environment, groundwater, and the like, and may finally endanger human health. Under the situation, the sewage of each enterprise is collected for further advanced treatment after primary treatment.

In recent years, the advanced treatment technology commonly used for refractory organic wastewater is widely applied to the technologies including modified Fenton process, ozone + BAF, ozone/hydrogen peroxide catalytic oxidation and the like.

Fenton and Fenton-like processes: the essence of the Fenton process is divalent iron ions (Fe)²⁺) And the hydroxyl radical is generated by the catalysis of chain reaction between the hydroxyl radical and hydrogen peroxide, has stronger oxidation capacity, and has the oxidation potential second to fluorine which is as high as 2.80V. In addition, the hydroxyl free radical has high electronegativity or electrophilicity, and the electron affinity of the hydroxyl free radical is as high as 569.3kJ, so that the Fenton reagent has strong addition reaction characteristics, can indiscriminately oxidize most organic matters in water, and is particularly suitable for the oxidation treatment of organic wastewater which is difficult to biodegrade or to perform effective chemical oxidation generally. In the Fenton process, raw water is firstly added with acid to adjust the pH value to be acidic, and Fe is added in the acidic environment²⁺Catalysis H₂O₂Generating hydroxyl free radicals to further oxidize and decompose organic matters, after the reaction is finished, carrying out pH adjustment on the sewage to obtain a pH adjustment area, adding a coagulant andand discharging the flocculant after solid-liquid separation. The Fenton process has the defects of large occupied area, high manufacturing cost, high sludge yield, high operating cost, large management and maintenance amount and the like, and the development of the Fenton process in the field of advanced treatment of refractory organic wastewater is restricted.

Ozone + BAF process: the strong oxidation of ozone oxidation is adopted to remove chromaticity and partial COD, the biodegradability of the wastewater is improved, the sewage after ozone treatment enters the biological aerated filter, and the metabolism of microorganisms is utilized to effectively remove organic matters and reduce total nitrogen. However, the process occupies a large area and is expensive in cost, and the COD of the effluent is difficult to stably control below 50 mg/L.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a pesticide chemical industry garden sewage degree of depth processing system.

The technical scheme of the utility model is that:

the utility model provides a pesticide chemical industry garden sewage advanced treatment system, includes preprocessing device, catalytic oxidation pond, biological filter and disinfection pond, and sewage loops through preprocessing device, catalytic oxidation pond, biological filter and disinfection pond and can carry out advanced treatment and reach sewage discharge standard.

Preferably, the pretreatment device comprises a secondary treatment tank, a secondary sedimentation tank and a coagulating sedimentation tank.

Preferably, a sludge concentration tank is further arranged at the coagulating sedimentation tank and is used for treating the precipitated sludge.

Preferably, the catalytic oxidation tank adopts a mode of mixing ozone and hydrogen peroxide to treat sewage.

Preferably, the biological filter is an aeration biological filter.

Preferably, a deoxidizing pool is also arranged between the catalytic oxidation pool and the biological aerated filter.

Adopt the technical scheme of the utility model, following beneficial effect has:

(1) pure ozone oxidation is that ozone directly reacts with pollutants, has selectivity on organic matters or intermediates, and has low reaction speed. Combination of hydrogen peroxide and ozoneWith, in addition to the autooxidation of hydrogen peroxide with ozone, the oxidation can be further enhanced by the generation of hydroxyl radicals. Organic contaminants in H₂O₂/O₃Degradation rate in oxidation process is higher than single H₂O₂Or O₃The oxidation process is 2-20 times faster;

(2) the ozone oxidation is heterogeneous catalytic oxidation, a fixed bed reactor is adopted, a spherical granular catalyst is filled in the reactor, the catalyst is a metal oxide sintered by rare metals and a carrier, the catalytic activity is high, the chemical property is stable, and the service life is long;

(3) the ozone oxidation reaction is carried out at normal temperature and normal pressure without adjusting the pH value of the sewage, and the reaction product is CO₂And H₂O, or a small molecular organic matter which is easy to biodegrade. The Fenton oxidation needs to adjust the sewage to be acidic (the pH value is 3-4), alkali is added for neutralization after reaction, a large amount of iron mud (dangerous waste) is generated, the salinity and iron ions of effluent are increased, and the subsequent biochemical treatment process is not favorable;

(4) ozone is easily distributed and its solubility in water is 12 times higher than that of oxygen. The ozone has high utilization rate, and is decomposed into oxygen after oxidation, thereby increasing the oxygen concentration in water. After catalytic oxidation of organic matter difficult to degrade in waste water by ozone, part of the organic matter is mineralized into CO₂And H₂O, a part of the organic matters are small molecular organic matters which can be degraded into biodegradable matters, so that the subsequent aerobic biological treatment is facilitated;

(5) the BAF biological filter adopts two stages, can reduce total nitrogen by using organic matters after catalytic oxidation of hydrogen peroxide/ozone, and further ensures that the effluent quality reaches the standard and is discharged;

(6) the disinfection tank adopts ozone dissipated by hydrogen peroxide/ozone, so that the medicament cost can be reduced.

Compared with other oxidation technologies, the hydrogen peroxide/ozone catalytic oxidation has the advantages of strong reaction capability, high reaction speed, low safety management risk, easiness in operation and management and the like, and is suitable for application of industrial wastewater treatment. The effluent is disinfected by ozone dissipated by hydrogen peroxide/ozone catalytic oxidation, so that secondary pollution caused by ozone is avoided, and the medicament cost in the disinfection process can be reduced.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a process schematic diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, the utility model provides a pesticide chemical industry garden sewage advanced treatment system, including preprocessing device 1, catalytic oxidation pond 2, biological filter 3 and disinfection pond 4, sewage loops through preprocessing device 1, catalytic oxidation pond 2, biological filter 3 and disinfection pond 4 and can carry out advanced treatment and reach sewage discharge standard. Preferably, the disinfection tank is disinfected by ozone, the ozone source is ozone dissipated from the catalytic oxidation tank, and the ozone disinfection is performed by utilizing the part of ozone, so that the problem that the ozone is affected on a human body or the environment after dissipation is solved, and the effect of the ozone in the aspect of disinfection is better.

The pretreatment device 1 comprises a secondary treatment tank 101, a secondary sedimentation tank 102 and a coagulating sedimentation tank 103.

A sludge concentration tank 104 is also arranged at the coagulating sedimentation tank 103 and is used for treating the precipitated sludge.

The catalytic oxidation tank 2 adopts a mode of mixing ozone and hydrogen peroxide to treat sewage. Mainly get rid of to difficult degradation organic matter, utilize the strong oxidizing property of hydroxyl free radical to decompose and oxidize the organic matter, get rid of most organic matters and improve waste water biodegradability. The main process is as follows: liquid oxygen is stored in a liquid oxygen storage tank and is subjected to high-pressure ionization in an ozone generator to finally generate ozone; ozone generated by the ozone generator is uniformly distributed to enter a gas distribution system at the bottom of the catalytic oxidation tank. After the effluent of the secondary sedimentation tank is subjected to flocculation and sedimentation treatment, the effluent is continuously pumped into a water distribution system at the bottom of the catalytic oxidation tank through a pump to uniformly distribute water, a hydrogen peroxide feeding point is arranged on a water inlet pipeline, and ozone and hydrogen peroxide can generate hydroxyl free radicals (OH) with strong oxidizing property under the action of a catalyst to oxidize and decompose organic pollutants in the sewage and finally generate H₂O and CO₂The purpose of removing pollutants is achieved; the residual ozone and air are collected at the top of the poolIntroducing into a disinfection tank; and (3) overflowing the oxidized sewage from the top of the reaction tank to the oxidation stabilization tank, staying for 1-2 hours in the oxidation stabilization tank, completely decomposing residual ozone in water, and allowing the decomposed sewage to automatically flow into a subsequent biological filter.

The biological filter 3 is an aeration biological filter. The biological aerated filter is divided into two stages: the first stage is a nitrification section, and the second stage is a denitrification section, and mainly removes organic matters and part of total nitrogen which can be biologically utilized after catalytic reduction and oxidation. The main process is as follows: the effluent after catalytic oxidation by ozone automatically flows into a water distribution system at the bottom of the biological aerated filter, the filter is in an upward flow state, sewage passes through a filter material layer, pollutants contained in the water body are intercepted by the filter material layer and are converted by biodegradation attached to the filter material, and COD and ammonia nitrogen are further removed.

A deoxidizing tank 5 is also arranged between the catalytic oxidation tank 2 and the biological aerated filter 3.

The utility model discloses the theory of operation does: firstly, sewage is pretreated in a pesticide chemical industry park, the sewage reaches a secondary treatment tank 101, the effluent of a secondary effluent tank 101 enters a secondary sedimentation tank 102, the effluent after sedimentation enters a coagulative precipitation tank 103, the coagulative precipitation tank 103 is divided into three areas, the first area is a pH value adjusting area, liquid caustic is added, the pH value is controlled to be 7.5-8, PAC is added in the second area, PAM is added in the third area, the effluent is subjected to solid-liquid separation in an inclined tube sedimentation zone, the supernatant enters a water distribution system at the bottom of a catalytic oxidation tank for uniform water distribution, and a hydrogen peroxide adding point is arranged on a water inlet pipeline; ozone generated by the ozone generator is uniformly distributed into a gas distribution system at the bottom of the catalytic oxidation tank 2, and gas and water are fully mixed and react. In order to prevent suspended matters (SS) carried by coagulating sedimentation effluent from accumulating on the surface of the catalyst during operation and influencing the catalytic activity, the backwashing is required to be carried out regularly. The sewage after catalytic oxidation overflows to a deoxidizing tank 5 from the top of the reaction tank, the residual ozone in the water in the deoxidizing tank 5 is thoroughly decomposed, the deoxidized sewage automatically flows into a subsequent biological aerated filter 3, denitrification is carried out in a denitrification section, nitrification is carried out in a nitrification section, and part of nitrified liquid flows back to the deoxidizing tank; the biological filter 3 is provided with a filter material layer with a certain height, microorganisms can be attached to the filter material, organic matters after catalytic oxidation are degraded by metabolism of the microorganisms, and the biological filter 3 adopts gas/water combined backwashing to ensure the ascending flow rate and the effluent quality of the filter; and after the sewage is treated by the aeration biological filter, the sewage enters a disinfection tank, and is disinfected by using ozone dissipated by the ozone catalysis tank, so that the quality of the effluent is ensured to reach the standard.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. The utility model provides a pesticide chemical industry garden sewage advanced treatment system which characterized in that: the device comprises a pretreatment device, a catalytic oxidation tank, a biological filter tank and a disinfection tank, wherein sewage can be subjected to advanced treatment to reach the sewage discharge standard through the pretreatment device, the catalytic oxidation tank, the biological filter tank and the disinfection tank in sequence; the catalytic oxidation tank is used for treating sewage in a mode of mixing ozone and hydrogen peroxide; a deoxidizing tank is also arranged between the catalytic oxidation tank and the biological aerated filter.

2. The pesticide chemical industry park sewage deep treatment system of claim 1, characterized in that: the pretreatment device comprises a secondary treatment tank, a secondary sedimentation tank and a coagulating sedimentation tank.

3. The pesticide chemical industry park sewage deep treatment system of claim 2, characterized in that: and a sludge concentration tank is also arranged at the coagulating sedimentation tank and is used for treating the precipitated sludge.

4. The pesticide chemical industry park sewage deep treatment system of claim 1, characterized in that: the biological filter is an aeration biological filter.