CN203295259U - Denitrification and precipitation integrated sewage treatment device - Google Patents

Abstract

The utility model discloses a sewage treatment device integrating denitrification and precipitation. The treatment device comprises a sewage treatment pool, and the sewage treatment pool is sequentially provided with a sludge layer composed of activated sludge, a lower The buffer layer, the lower inclined pipe, the upper buffer layer, the upper inclined pipe and the outlet channel. A mud scraper is installed in the sludge layer to mix the inflowing sewage and the sludge layer to achieve denitrification and intercept suspended solids ; The sludge rich in denitrifying bacteria is attached to the upper and lower inclined pipes to achieve the purpose of strengthening denitrification and solid-liquid separation. The utility model has the advantage that the removal rate of TN and COD can be improved at the same time, and the treatment device successfully realizes the simultaneous and stable removal of nitrite, nitrate and COD, and the highest removal efficiency of TN and COD in sewage during this period reaches 58% and 23% respectively %; The application of this combination process achieves small footprint, simple operation and management, high load rate, short hydraulic retention time and good treatment effect.

Description

Sewage treatment device integrating denitrification and sedimentation

technical field

The utility model belongs to the technical field of environmental engineering, and in particular relates to a sewage treatment device which integrates denitrification and sedimentation of an upward flow fixed bed and activated sludge.

Background technique

As our country enters a period of rapid urbanization, the overall deterioration of the water environment is very serious, and serious problems such as water pollution and eutrophication have generally appeared. These phenomena have caused obstacles to the water cycle, shortage of water resources, and threats to water security in some areas. , the deterioration of water ecology, and the destruction of water landscape have become bottlenecks restricting the sustainable development of my country's economy. A large number of studies have proved that nitrogen and phosphorus in sewage are the main causes of eutrophication in receiving water. The secondary sewage biological treatment technology used in the past mainly removes organic matter and suspended solids, and the removal efficiency of nitrogen and phosphorus is low. requirements, and proposed to upgrade a large number of existing urban sewage treatment plants that do not have the ability to remove nitrogen and phosphorus. During the "Twelfth Five-Year Plan" period, a clear environmental goal was put forward for energy conservation and emission reduction: by 2015, the country's new daily sewage treatment capacity will be 42 million tons, COD emissions will be reduced by 2.8 million tons, and the country's counties and key towns will basically have sewage treatment Capacity, the urban sewage treatment rate must reach 85%, high standards and high growth means huge technical demand.

Mature process technology and operation management experience make the activated sludge process the most widely used biological treatment process for denitrification and phosphorus removal of sewage. In the anaerobic section, phosphorus-accumulating bacteria release phosphorus and absorb easily degradable organic matter such as low-level fatty acids; in the anoxic section, denitrifying bacteria convert the nitrate brought in by the internal reflux into nitrogen and escape through denitrification, thereby achieving denitrification On the one hand, the aerobic section degrades organic matter, and on the other hand converts ammonia nitrogen and ammonia nitrogen formed from organic nitrogen into nitrate through biological nitrification. In addition, the phosphorus released in the anaerobic stage is adsorbed by activated sludge under aerobic conditions and discharged with the remaining sludge to achieve the purpose of phosphorus removal. The process itself has different sludge ages of nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, competition and contradictions between phosphorus release and denitrification for carbon sources, and it is difficult to obtain efficient removal of nitrogen and phosphorus in the same system at the same time. The complete oxidation of ammonia at full flow and the high proportion of mixed liquid reflux all lead to a large process area and high energy consumption.

Sewage treatment is the best carrier for the practice of energy saving and emission reduction, while denitrification has become a bottleneck restricting the activated sludge process. Both anammox and nitrification processes can be easily realized in the anaerobic and aerobic stages, but the control of denitrification is difficult and the stability is not strong, so the restrictive link of the biological denitrification process is the denitrification link.

Utilizing the advantages of the upflow sludge bed reactor and combining the advantages of saving land when the inclined plate sedimentation tank works, we have developed a sewage denitrification treatment process and device coupled with the upflow fixed bed and activated sludge method.

Contents of the invention

The purpose of this utility model is to provide a sewage treatment device integrating denitrification and sedimentation according to the shortcomings of the above-mentioned prior art. The treatment device mainly includes upper and lower inclined pipes and mud scrapers. The inclined pipe adopts the sludge rich in denitrifying bacteria to adhere to strengthen the effect of denitrification, and the mud scraper uses grid bars for stirring to make the sewage contact with high-concentration activated sludge to play the role of suspending in the sewage. Solids retention, denitrification, and hydrolytic acidification.

The object of the present invention is realized by the following technical solutions:

A sewage treatment device integrating denitrification and precipitation, the sewage includes raw water and aerobic tank mixed solution, characterized in that the treatment device includes a sewage treatment tank, and the bottom of the sewage treatment tank is provided with active sewage A sludge layer composed of mud, a sludge scraper is installed in the sludge layer, and a lower buffer layer, a lower inclined pipe, an upper buffer layer, an upper inclined pipe, and an outlet channel are sequentially arranged above the sludge layer, wherein Sludge rich in denitrifying bacteria is attached to the lower inclined pipe and the upper inclined pipe.

The water inlet pipe of the sewage treatment tank is arranged on the top of the sludge layer.

The central axis of the upper inclined pipe is provided with a triangular weir sump, which is connected to the outlet channel, and the end of the outlet channel is the outlet pipe of the sewage treatment tank.

The mud scraper is composed of a grid, a mud suction pipe and a pump. The grid is placed in the sludge layer, the bottom of the mud suction pipe is located in the sludge layer, and its top is connected to the sludge layer. The pump above the outlet channel is connected; a mud outlet pipe is provided at the bottom of the triangular weir sump, and the mud suction pipe is connected to the mud outlet pipe through a mud delivery pipe.

The thickness of the sludge layer is 0.9-1.1m, the height of the lower buffer layer is 0.4-0.6m, the height of the lower inclined pipe is 0.6-0.8m, and the height of the upper buffer layer is 0.2-0.4m. The height of the upper inclined pipe is 0.6-0.8m, and the distance between the upper inclined pipe and the liquid surface is 0.9-1.1m.

The utility model has the advantage that the removal rate of TN and COD can be improved at the same time, and the treatment device successfully realizes the simultaneous and stable removal of nitrite, nitrate and COD, during which the highest removal efficiency of TN and COD in the sewage reaches 58% and 23% respectively. %; The application of this combination process achieves small footprint, simple operation and management, high load rate, short hydraulic retention time and good treatment effect.

Description of drawings

Fig. 1 is a structural schematic diagram of a sewage treatment device integrating denitrification and precipitation in the present invention.

Detailed ways

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figure 1, the marks 1-12 in the figure are: water inlet pipe 1, sludge layer 2, lower inclined pipe 3, upper inclined pipe 4, outlet channel 5, mud scraper 6, grid bar 6-1, mud suction pipe 6-2, pump 6-3, mud delivery pipe 7, mud outlet pipe 8, water outlet pipe 9, triangular weir sump 10, lower buffer layer 11, upper buffer layer 12.

Embodiment: This embodiment relates to a sewage treatment device coupled with an upward flow fixed bed and activated sludge denitrification. The device mainly includes: double-layer inclined tube packing and a special sludge scraper. The double-layer inclined tube packing adopts special packing to strengthen the attachment of sludge rich in denitrifying bacteria, increase the concentration of denitrifying bacteria in the reactor, and strengthen the effect of denitrification. The special sludge scraper stirs through the customized grid, and the incoming water contacts with high-concentration activated sludge, and at the same time plays the role of SS interception (suspended solids in water), denitrification and hydrolysis acidification.

As shown in Figure 1, the following is a specific structural description of the treatment device: the treatment device includes a rectangular sewage treatment tank, the water inlet pipe 1 and the water outlet pipe 9 are respectively located at both ends of the sewage treatment tank, and the effective depth of the tank body is about 5m ; In the sewage treatment tank, the sludge layer 2, the lower buffer layer 11, the lower inclined pipe 3, the upper buffer layer 12, the upper inclined pipe 4 and the outlet channel 5 are arranged successively from bottom to top, and the sludge layer at the bottom of the sewage treatment tank 2 is high-concentration activated sludge with a thickness of about 1m. A special sludge scraper 6 is installed in the sludge layer 2; the lower buffer layer 11 between the sludge layer 2 and the lower inclined pipe 3 has a height of about 0.5m; sludge rich in denitrifying bacteria is attached to the lower inclined pipe 3, and the height is about 0.7m; the height of the upper buffer layer 12 between the lower inclined pipe 3 and the upper inclined pipe 4 is about 0.3m; the upper inclined pipe The sludge rich in denitrifying bacteria is also attached, and the height is about 0.7m; the distance between the top surface of the upper inclined pipe 4 and the liquid surface is about 1m. The water inlet pipe 1 is located above the top of the sludge layer 2; on the central axis of the upper inclined pipe 4, a triangular weir sump 10 is longitudinally arranged, and the outlet channel 5 is connected to the triangular weir sump 10, and is set in the triangular weir sump 10 Water outlet pipe 9 is arranged.

As shown in Figure 1, the mud scraper 6 mainly includes a grid bar 6-1, a mud suction pipe 6-2 and a pump 6-3, and the grid bar 6-1 is arranged in the sludge layer 2, and can perform rotating and stirring motion; The bottom of the mud pipe 6-2 is submerged in the sludge layer 2, and its top is connected to and driven by the pump 6-3. A mud pipe 7 is extended on the upper part of the mud suction pipe 6-2. The mud pipe 7 is connected with the set The mud outlet pipe 8 at the bottom of the triangular weir sump 10 is connected.

As shown in Figure 1, the sewage denitrification treatment process specifically includes the following steps:

① The water inlet pipe 1 of the treatment device is located in the lower layer of the sewage treatment tank. The sewage flowing in from the water inlet pipe 1 mainly includes raw water and the mixed solution of the aerobic tank; the sludge layer 2 is located below the height of the water inlet pipe 1, and mainly passes through the filling area of the lower inclined pipe 3 The sludge layer is formed by free sedimentation, flocculation sedimentation and crowded sedimentation in the sludge area. The properties of these sludges are similar to those of traditional activated sludge. Reaching 10mg/L, there is a very large number of denitrifying bacteria in the activated sludge, which strengthens the denitrification; when the sewage flows in, start the grid 6-1 on the mud scraper 6 to stir, so that the sewage and sewage The mud layer 2 is mixed to play the role of SS interception and denitrification;

② Afterwards, the sewage enters the lower inclined pipe 3 through the lower buffer layer 11, and the denitrification is strengthened through the action of the sludge rich in denitrifying bacteria attached therein. There are more carbon sources in the raw sewage water, while the aerobic pool There is more nitrate nitrogen in the mixed solution, and in the anoxic environment, the denitrification is mainly carried out in the sludge layer 2 and the filling area of the lower inclined pipe 3;

③ After the sewage passes through the filling area of the lower inclined pipe 3, it then enters the filling area of the upper inclined pipe 4 through the upper buffer layer 12. The denitrification in this area continues, but the denitrification rate has been inhibited by the concentration of nitrate nitrogen, and the separated sewage The role of SS in the middle is dominant;

④ After denitrification and mud-water separation in the filling area of the upper inclined pipe 4, the treated sewage enters the outlet channel 5, is collected by the triangular weir sump 10, and then enters the outlet pipe 9;

⑤ After the activated sludge in the sludge layer 2 has passed through for a certain period of time, when the concentration of the activated sludge is higher than 15mg/L, the mud scraper 6 starts to suck the sludge, and part of the activated sludge in the sludge layer 2 is pumped into the pump 6- 3 is sucked out by the mud suction pipe 6-2, and sent to the mud outlet pipe 8 through the mud delivery pipe 7, which is beneficial to the renewal of the activated sludge in the treatment device and ensures that the denitrifying bacteria in the reactor have higher activity.

The process is characterized by high denitrification efficiency and small footprint. Because there are high concentrations of denitrification bacteria in the double-layer inclined tube packing, and the bottom sludge has the denitrification function of ordinary activated sludge method, so the whole pool The denitrification rate of the body is greatly improved, and the residence time of sewage in the pool can be shortened to less than 1 hour. While improving the denitrification efficiency and saving land, it has a good development prospect in terms of saving land.

The remarkable effect of this embodiment is: the removal rate of TN and COD can be improved at the same time, and the treatment device successfully realizes the simultaneous and stable removal of nitrite, nitrate and COD. During this period, the highest removal efficiency of TN and COD in sewage reached 58% and twenty three%. The application of this combination process achieves the advantages and beneficial effects of small floor space, simple operation and management, high load rate, short hydraulic retention time, and good treatment effect.

Claims (5)

1. the waste disposal plant of a denitrification and precipitation integral, described sewage comprises former water and Aerobic Pond mixed solution, it is characterized in that described treatment unit comprises a treatment tank, the bottom of described treatment tank is provided with the sludge blanket that consists of active sludge, in described sludge blanket, mud scraper is installed, the top of described sludge blanket is disposed with bottom breaker, lower floor's inclined tube, upper buffer layer, upper strata inclined tube and outlet canal, is attached with the mud that is rich in denitrifying bacterium in wherein said lower floor inclined tube and upper strata inclined tube.

2. the waste disposal plant of a kind of denitrification according to claim 1 and precipitation integral, is characterized in that the water inlet pipe of described treatment tank is arranged at described sludge blanket top.

3. the waste disposal plant of a kind of denitrification according to claim 1 and precipitation integral, the central axis place that it is characterized in that described upper strata inclined tube is provided with the V-notch weir water leg, and with described outlet canal, be connected, the end of described outlet canal is the rising pipe of described treatment tank.

4. the waste disposal plant of a kind of denitrification according to claim 1 and precipitation integral, it is characterized in that described mud scraper consists of grizzly bar, suction pipe and pump, described grizzly bar is placed in described sludge blanket, the bottom of described suction pipe is arranged in described sludge blanket, and its top is connected with the described pump that is arranged at described outlet canal top.

5. the waste disposal plant of a kind of denitrification according to claim 1 and precipitation integral, the thickness that it is characterized in that described sludge blanket is 0.9～1.1m, described bottom breaker height is 0.4～0.6m, described lower floor inclined tube height is 0.6～0.8m, described upper buffer layer height is 0.2～0.4m, described upper strata inclined tube height is 0.6～0.8m, the 0.9～1.1m of being separated by between described upper strata inclined tube and liquid level.

Images