CN219585916U

CN219585916U - UAD biological filter tower device based on sulfur autotrophy

Info

Publication number: CN219585916U
Application number: CN202220326680.6U
Authority: CN
Inventors: 管春雷; 蔡诚; 王静; 高占平; 陶正兴
Original assignee: Cec Environmental Protection Co ltd
Current assignee: Cec Environmental Protection Co ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2023-08-25
Anticipated expiration: 2032-02-18

Abstract

The utility model relates to the technical field of sewage treatment denitrification, and discloses a UAD biological filter tower device based on sulfur autotrophy. According to the method, autotrophic denitrifying bacteria are fixed in a high specific surface area filler of an upflow biological filter tower, and nitrate nitrogen in sewage is degraded and removed under the condition that an external organic carbon source is not needed. The utility model has the advantages of high denitrification efficiency, high treatment load, excellent effluent quality, intelligent operation control and the like, and is suitable for denitrification treatment of nitrate nitrogen industrial wastewater and denitrification upgrading of municipal wastewater secondary effluent.

Description

UAD biological filter tower device based on sulfur autotrophy

Technical Field

The utility model relates to the technical field of sewage denitrification treatment, and discloses a UAD (Up-flow Autotrophic Denitrification) biological filter tower device based on sulfur autotrophy.

Background

Eutrophication of water is a global phenomenon in recent decades, and is affected by human activities, and the increase of the discharge amount of nutrient elements in water such as rivers, lakes and the like causes the water to tend to be eutrophicated. When eutrophication occurs in the water body, certain algae are exploded, so that the lack of oxygen in the water quality is deteriorated, the fishy smell is fully enriched everywhere, the stability of the water body ecological system is destroyed, and the urban water supply and drinking water safety are seriously affected. The root cause of water eutrophication is the increase of nutrient elements nitrogen and phosphorus. Secondary treated effluent of town sewage plants and high nitrate nitrogen industrial wastewater are main sources of sewage nitrogen element emission.

The existing biological degradation organic matter content in the secondary biochemical section of the old sewage treatment plant (station) is low, namely, when the C/N is low, the original carbon source in the water can not meet the requirements of biological denitrification and denitrification, and then the organic carbon source is required to be additionally added into the water. Thereby bringing high running cost, secondary pollution and other problems, and often being difficult to achieve the ideal denitrification treatment effect. The solar cell production wastewater, uranium mine underground water and other nitrate nitrogen content are high, and at present, high-concentration nitrate nitrogen wastewater is mostly treated by adopting a physicochemical method, such as reverse osmosis, electrodialysis, ion exchange method and the like, but the treatment cost is high and the maintenance is difficult.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a UAD biological filter tower device based on sulfur autotrophy. The flora of the biological film reaction unit exists in the form of biological film, and the flora is the specialized inorganic autotrophic thiobacillus, and the metabolic process is to utilize elemental sulfur (S) and sulfide (S) in anaerobic or anoxic environment ^2- ) Etc. are electron donor, under the condition of a certain alkalinity, nitrate is used as electron acceptor to make nitrate Nitrogen (NO) ₃ ^- ) Reduction to nitrogen (N) ₂ ) And simultaneously oxidizing sulfur into sulfate. The device takes sulfur powder or waste sulfide precipitate as an electron donor, does not need to add an organic carbon source, can meet the recycling utilization, and can achieve the aim of denitrification; at the same time, the utility model has high denitrification efficiency and negative treatmentThe method has the advantages of high load, excellent water quality, intelligent operation control and the like, and is suitable for denitrification treatment of high nitrate nitrogen industrial wastewater and denitrification upgrading of municipal wastewater secondary effluent.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the UAD biological filter tower device based on sulfur autotrophy is characterized by comprising a water inlet mixing unit, a UAD biological filter tower and a water outlet drainage unit, wherein a water collecting and distributing unit and a biological film reaction unit are sequentially arranged in the UAD biological filter tower from top to bottom; the water collecting and distributing unit comprises a steady flow area and a water collecting channel, and the water collecting channel is an overflow weir; the water outlet of the water inlet mixing unit is connected with the water inlet of the UAD biological filter tower, which is positioned above the biological membrane reaction unit; the water inlet is connected with the water collecting channel; the biological membrane reaction unit comprises a filter plate, water distribution filter heads, a supporting layer and a sulfur autotrophic filter material layer, wherein the water distribution filter heads are uniformly distributed on the filter plate, the supporting layer is positioned above the filter plate, and the sulfur autotrophic filter material layer is positioned above the supporting layer.

Further, an oxidation-reduction potentiometer and a pH detector are arranged at the water inlet and outlet of the UAD biological filter tower. The oxidation-reduction potentiometer value monitoring can be used for judging whether the reaction in the UAD is in an anoxic state or not; the pH value in UAD is timely adjusted by detecting the pH change of the inlet water and the outlet water to reach the optimal biological reaction condition, and sodium carbonate is added into the water when the pH value of the outlet water is monitored to be lower than 6.5 so as to improve the pH value of the inlet water; by detecting the nitrate nitrogen removal rate of the inlet water and the outlet water and the nitrate nitrogen outlet water concentration, when the nitrate nitrogen value of the outlet water is higher than 5mg/L or the removal rate is lower than 40%, sulfur powder is added into the water.

Furthermore, the water inlet mixing unit comprises mixing of sulfur powder and sodium carbonate, and adopts a branch pipe dosing mode, namely 2 dosing ports are formed in a water inlet pipe and used for dosing the sulfur powder and the sodium carbonate, and the water inlet is mixed with the sulfur powder and the sodium carbonate through water flowing.

Further, the water collecting and distributing unit comprises a steady flow area and a water collecting channel, and the height of the steady flow area is 0.3m; the water collecting channel is an annular overflow weir, is circumferentially arranged, and is also provided with a backwashing water outlet.

Further, the biological membrane reaction unit comprises a filter plate, water distribution filter heads, a supporting layer and a sulfur autotrophic filter material, wherein the water distribution filter heads are uniformly arranged on the filter plate; the supporting layer is positioned above the filter plate; the sulfur autotrophic filter material is positioned above the supporting layer.

Furthermore, the sulfur autotrophic filter material adopts a fixed MBBR filler, and the diameter of the filler is 10mm.

Further, the water outlet and drainage unit comprises a water outlet area and a drainage pipe. The height of the drainage pipeline is consistent with that of the sulfur autotrophic filter material layer, and the height of the sulfur autotrophic filter material layer is 300mm away from the water inlet.

Further, the water outlet area is arranged at the lower part of the filter plate, and the depth is 0.5m.

Furthermore, the drainage pipeline is in a shape like a Chinese character 'ji', and the highest part is flush with the height of the filling material.

A denitrification method of a UAD biological filter tower system based on sulfur autotrophy based on the device comprises the following steps: the autotrophic denitrifying bacteria are fixed in a sulfur autotrophic filter material of a biological filter tower, sulfur powder is used as an electron donor required by autotrophic denitrification, and nitrate nitrogen in sewage is degraded and removed under the condition of no need of externally adding an organic carbon source.

The beneficial effects of the utility model are as follows:

(1) The operation cost is low. Unlike traditional heterotrophic denitrification mode, sulfur autotrophic denitrification is a novel biological denitrification technology, which does not need to add organic carbon source, and uses sulfur simple substance as electron donor and inorganic carbon as carbon source to realize removal of nitrate nitrogen.

(2) High denitrification efficiency and high treatment load. The sulfur autotrophic denitrification benefits from the characteristics of a biomembrane method, gets rid of the sludge age limitation caused by long generation period of nitrifying bacteria, and increases the concentration of the sulfur autotrophic denitrifying bacteria, thereby improving the treatment load. In addition, the UAD biological filter tower has high height-diameter ratio, and the sulfur autotrophic filter material is preferably ceramic filter material, and the filter material has the advantages of round and uniform particles, rough surface, micropores, developed internal gaps and large specific surface area, and can reach 1m ² The stacking void ratio is more than or equal to 40 percent and the stacking density is between 800 and 1100kg/m ³ . Therefore, the method has the advantages of strong biological bacteria adhesion, rapid propagation, high film forming efficiency and the like, and still has higher ammonia nitrogen removal rate under the low-temperature and low-turbidity conditions. In addition, the filter material has the advantages of stable chemical property, long service life and the like. Thanks to the excellent characteristics of the filter material, the microorganism concentration is effectively improved under the same volume, so that the denitrification effect is improved by 20-40% under the same condition. The denitrification effect is improved, the treatment load is further increased, and the equipment volume is reduced, so that the method has the great advantage of saving the occupied area.

(3) In the aspect of back flushing, the volume of the filter material layer expands during back flushing, so that the filling rate of the filter material is reduced from 100% of inlet water to about 70%. Thanks to the characteristics of the filter material, the back flushing water consumption is low, the flushing energy consumption is low, and the flushing time is shortened, so that the equipment can be put into operation more quickly. In addition, the back flushing frequency of the UAD biological filter tower is about 1 time/day, the denitrification efficiency can be recovered by more than 80% within 0.5h after each back flushing, and the deep denitrification function can be stably realized. In addition, the sulfur autotrophic microorganism uses sulfur simple substance as electron donor to carry out denitrification, the loss amount of sulfur is very small in actual operation, and the configuration period of sulfur powder suspension can be prolonged to more than half a month, so that the operation is simple, and the automation control can be completely realized.

(4) The hydraulic retention time is short, and the occupied area is small. The UAD biological filter tower adopts an intelligent modularized structure, has compact structure and higher height-diameter ratio, and therefore has the great advantage of saving the occupied area. Meanwhile, the technology based on sulfur autotrophic denitrification can also achieve higher denitrification removal efficiency. In addition, the device is also provided with an oxidation-reduction potentiometer, a pH detector and various electric valves, so that the biological reaction state can be judged, automatic operation can be realized, and the operation is simple.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

The meaning of each reference numeral in the figures is: 1. a water inlet; 2. a water collecting and distributing unit; 3. a sulfur autotrophic filter material layer; 4. a water distribution filter head; 5. a filter plate; 6. a water outlet area; 7. backwashing the water inlet; 8. a water outlet; 9. a steady flow region; 10. a water collecting channel; 11. backwashing the water outlet; 12. a sodium carbonate dosing port; 13. a sulfur powder adding port; 14. a water inlet mixing unit; 15. a water outlet pipe; 16. a biofilm reaction unit; 17. a water outlet drainage unit;

Detailed Description

The utility model is further described with reference to the accompanying drawings and specific examples:

as shown in FIG. 1, the UAD biological filter tower system based on sulfur autotrophy comprises a water inlet mixing unit, a water collecting and distributing unit, a biological membrane reaction unit and a water outlet drainage unit.

Based on the device, the UAD biological filter tower is subjected to bacteria cultivation and domestication in the early stage to perform microorganism cultivation, the adopted microorganisms are obtained from strains, and the nitrogen-containing wastewater is used for cultivation starting. After the sludge is cultured for about two weeks, sulfur is added into the UAD biological filter tower for enrichment culture, and the denitrifying sludge with autotrophic characteristics is domesticated and cultured. During the culture period, adding nutrient solution once every two days and replacing supernatant, wherein the main components of the nutrient solution are wastewater mixed sodium carbonate and sulfur solution, the domestication time is about 14d, and the NO in the water is measured ₃ N is lower than 2mg/L, and the directional domestication of the sulfur autotrophic denitrification sludge is considered to be completed.

The UAD biological filter tower operates periodically, and a complete period is from the beginning of filtering to the end of back flushing. The specific process is as follows: the sewage after the second-stage biochemical treatment and the UAD biological filter tower effluent after the sulfur autotrophic denitrification are mixed according to the reflux ratio (50% -150%) and the sulfur powder suspension, and then enter into the UAD water accumulation channel.

The mixed sewage flows downwards, uniformly enters the steady flow area through the water collecting channel, and then passes through the oxygen-deficient area of the sulfur autotrophic filter material layer, and the sewage flow velocity in the sulfur autotrophic filter material layer can reach 2-5 m/h. In the anoxic zone, sulfur autotrophic denitrifying bacteria are used for preparing sulfur (S) and sulfide (S) ^2- ) Etc. as electron donor, nitrate as electron acceptor and nitrate nitrogen (NO ₃ ^- ) Reduction to nitrogen (N) ₂ ) And realizing denitrification. The reaction formula is shown as follows:

preferably MBBR filter material with rough surface, micropores, developed internal gaps, large specific surface area and effective surface of more than 970m ² /m ³ The void ratio is more than or equal to 85 percent. Therefore, the method has the advantages of strong biological bacteria adhesion, rapid propagation, high film forming efficiency and the like, and still has higher ammonia nitrogen removal rate under the low-temperature and low-turbidity conditions. In addition, the filter material has the advantages of stable chemical property, long service life and the like. The average grain diameter of the sulfur autotrophic filter material is 10mm, and the total height is 0.8m.

The purified sewage flowing out of the sulfur autotrophic filter material is discharged through a filter head arranged on the UAD biological filter tower. The route is as follows: (1) discharging to the outside of the UAD biological filter tower; (2) mixing the wastewater with the secondary treatment wastewater according to a reflux ratio, and entering a UAD biological filter tower to realize sulfur autotrophic denitrification; (3) as backwash water.

Various particles, colloid pollutants and aged and fallen microbial films can be trapped in the operation process of the UAD biological filter tower, so that the device can be blocked after being operated for a period of time, and back flushing is needed. A pressure detection instrument is arranged at the water inlet front section of the UAD biological filter tower, and backwash is automatically judged by collecting the change of pressure difference. The back flushing process is as follows: (1) closing the water inlet valve; (2) washing with water; and the UAD biological filter tower after back flushing enters the next period to run.

Water quality of inlet water in actual operation: the pH value is 6-9, TNTN is less than or equal to 20mg/L, and TN of effluent can be stabilized below 5 mg/L.

Claims

1. The UAD biological filter tower device based on sulfur autotrophy is characterized by comprising a water inlet mixing unit, a UAD biological filter tower and a water outlet drainage unit, wherein a water collecting and distributing unit and a biological film reaction unit are sequentially arranged in the UAD biological filter tower from top to bottom; the water collecting and distributing unit comprises a steady flow area and a water collecting channel, and the water collecting channel is an annular overflow weir; the water outlet of the water inlet mixing unit is connected with the water inlet of the UAD biological filter tower, which is positioned above the biological membrane reaction unit; the water inlet is connected with the water collecting channel; the biological membrane reaction unit comprises a filter plate, water distribution filter heads, a supporting layer and a sulfur autotrophic filter material layer, wherein the water distribution filter heads are uniformly distributed on the filter plate, the supporting layer is positioned above the filter plate, and the sulfur autotrophic filter material layer is positioned above the supporting layer.