CN209890336U

CN209890336U - Device for enhancing gas stripping plug flow type oxidation ditch effect by using suspension carrier

Info

Publication number: CN209890336U
Application number: CN201920577235.5U
Authority: CN
Inventors: 牛学义; 牛卉; 于萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-01-03
Anticipated expiration: 2029-04-25

Abstract

The utility model relates to a device for strengthening the effect of an air-stripping plug-flow type oxidation ditch by using a suspension carrier, which comprises a sludge anoxic zone, an arc-shaped guide wall, a vertical separation guide wall, an air-stripping plug-flow zone, a sludge film strengthening nitrification zone, a post-positioned sludge denitrification zone and a post-positioned oxygenation zone, wherein the sludge anoxic zone is communicated with the air-stripping plug-flow zone through a water through hole at the bottom of a front partition wall of the air-stripping zone; the air stripping thrust zone is provided with an air stripping air supply vertical pipe and an air stripping aerator system which are required by mud-water mixed liquid thrust; the sludge film enhanced nitrification area is communicated with the sludge anoxic area through a circular water through hole on a partition wall behind the drum screen. The utility model can be applied to the upgrading and reconstruction of the sewage treatment facility which adopts the oxidation ditch process or the newly-built facility with strict requirements on nitrogen and phosphorus removal.

Description

Device for enhancing gas stripping plug flow type oxidation ditch effect by using suspension carrier

Technical Field

The utility model relates to a device for strengthening air stripping plug flow type oxidation ditch effect by using a suspension carrier, belonging to the field of sewage treatment.

Background

The basic form of the most important structure of the oxidation ditch biological sewage treatment process is a closed ditch shape, and the shape and the structure of the ditch are various. The ditch can be round, oval and other shapes, can be a single ditch or a plurality of ditches, can also be a group of ditches which are parallel to each other and have the same size, and comprises oxidation ditches which are separately built with the secondary sedimentation tank and combined oxidation ditches.

After decades of use, research, development and improvement, the oxidation ditch is greatly developed in the aspects of pool type structure, operation mode, aeration device, treatment scale, application range and the like. Theoretically, the reactor has the characteristics of plug flow biochemical reaction and the advantages of complete mixing reaction, wherein the former makes the reactor have excellent water outlet conditions, and the latter makes the reactor have the capability of resisting impact load. Because of the circulation and the energy division, the device has a plurality of advantages possessed by other sewage biological treatment technologies, wherein the most remarkable advantage is stable and reliable operation.

The biological phosphorus and nitrogen removal function of the reinforced oxidation ditch is the development direction of the oxidation ditch, for example, the biological membrane theory can be used for reference, the total amount of microorganisms of a unit reactor is improved, and the sludge membrane mixing process for mixing the biological membrane and the activated sludge on the biological membrane carrier is developed, so that the toxic impact resistance of the microorganisms in the oxidation ditch can be improved while the nitrogen and phosphorus removal function of the sludge membrane mixing process is reinforced.

The MBBR moving bed biofilm process increases the biomass and the biological species in a reactor by adding a certain amount of suspension carriers into the reactor, thereby improving the treatment efficiency of the reactor. As the density of the filler is close to that of water, the filler is completely mixed with the water during aeration, and the environment for the growth of microorganisms is three phases of gas, liquid and solid. The collision and shearing action of the carrier in water makes air bubbles finer, and the utilization rate of oxygen is increased. In addition, each carrier has different biological species inside and outside, anaerobic bacteria or facultative bacteria grow inside, and aerobic bacteria grow outside, so that each carrier is a micro-reactor, nitrification reaction and denitrification reaction exist simultaneously, and the treatment effect is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of current circulation ditch type oxidation ditch in the aspect of the degree of depth denitrogenation processing, provide a strengthen the device that air stripping pushes away STREAMING oxidation ditch effect with the suspension carrier, can be applied to the upgrading transformation that has built the sewage treatment facility that adopts the oxidation ditch technology, also can be applied to the newly-built sewage treatment facility that has higher requirement to the nitrogen and phosphorus removal.

The technical scheme of the utility model is that:

a device for enhancing the effect of a gas stripping plug-flow type oxidation ditch by using a suspended carrier comprises a sludge anoxic zone, an arc-shaped guide wall, a vertical separation guide wall, a gas stripping plug-flow zone, a sludge film enhanced nitrification zone, a rear sludge denitrification zone and a rear oxygen charging zone, wherein the sludge anoxic zone is communicated with the gas stripping plug-flow zone through a water through hole at the bottom of a front partition wall of the gas stripping zone, and the sludge anoxic zone is provided with a water inlet pipe orifice, a return sludge pipe orifice and an anoxic zone plug-flow device of a hoisting device arranged on a walkway plate; the arc-shaped guide wall is positioned at the end of the circulating flow channel of the biochemical treatment device; the vertical separation guide wall is positioned in the middle of the circulating flow channel of the biochemical treatment device; the air-lifting thrust zone is communicated with the sludge anoxic zone through a water hole at the bottom of the front partition wall of the air-lifting zone, is also communicated with the sludge membrane enhanced nitrification zone through a water hole at the top of the rear partition wall of the air-lifting zone, and is provided with an air-lifting air supply vertical pipe and an air-lifting aerator system required by mud-water mixed liquid thrust; the sludge membrane enhanced nitrification area is communicated with the sludge anoxic area through a circular water through hole on a partition wall behind the drum screen, the sludge membrane enhanced nitrification area is also communicated with the post-positioned sludge denitrification area through a rectangular water through hole on a partition wall behind the upright flat screen, and an aerator system and a suspension carrier are arranged in the sludge membrane enhanced nitrification area; the post-sludge denitrification area is communicated with the post-oxygenation area through a water through hole at the bottom of the outer end of the middle partition wall, and a stirrer and a carbon source feeding pipe orifice are arranged in the post-sludge denitrification area; an aerator system and a water outlet pipe orifice are arranged in the post-positioned oxygen charging area.

Further, the stripping aerator system is arranged in a ring shape.

Furthermore, the sludge membrane enhanced nitrification area is simultaneously provided with a roller screen through which most of nitrification liquid can flow and enter the sludge anoxic area, and a vertical flat screen through which the rest of nitrification liquid can flow and enter the post-positioned sludge denitrification area.

The utility model has the advantages that:

1) when quality of water variation, the water yield of intaking increases or when the play water index requirement to ammonia nitrogen, TN, total phosphorus is stricter, adopt the utility model discloses can change the lower situation of mud concentration in the traditional activated sludge oxidation ditch, the biomass in the multiplicable processing system unit volume of combination that the mud membrane mixes guarantees a water quality of water.

2) The increase of the suspended filler in the sludge film enhanced nitrification area can correspondingly increase the volume of the sludge anoxic area while reducing the aerobic ammonia nitrogen nitrification volume, so that the preposed denitrification capability in the biochemical treatment system is enhanced, and the burden of the postposition denitrification deep denitrification is reduced.

3) The utility model has the advantages that the air stripping thrust area is arranged in front of the water inlet end of the side of the sludge membrane enhanced nitrification area, the air stripping aeration system is arranged between the front partition wall of the air stripping area and the rear partition wall of the air stripping area, the air stripping aeration system provides pressure air through the air stripping air supply vertical pipe, when the pressure air is aerated into the area, the liquid level difference between the inside and the outside of the air stripping thrust area can be caused, the mixed muddy water is pushed to flow, and the flowing speed of the muddy water can be controlled by adjusting the air supply amount of the air stripping thrust area; in addition, in the water treatment process, the top end of the rear partition wall of the gas stripping area is lower than the top end of the front partition wall of the gas stripping area and lower than the liquid level of the sludge film enhanced nitrification area, so that under the action of the bottom gas stripping aeration system, the density of the sludge-water mixed liquid in the gas stripping thrust area is lower than that of the sludge-water mixed liquid in the sludge film enhanced nitrification area behind the rear partition wall of the gas stripping area, and under the action of water pressure, the sludge-water mixed liquid enters the sludge film enhanced nitrification area through the top end of the rear partition wall of the gas stripping area to form a; the result is that the sludge water in the air stripping thrust zone is pre-aerated and oxygenated, and the damage to the suspended carrier caused by the flow impeller arranged in the sludge membrane enhanced nitrification zone is overcome.

4) Because the sludge membrane enhanced nitrification area is simultaneously provided with the roller screen through which most of the nitrified liquid can flow into the sludge anoxic area and the upright flat screen through which the rest of the nitrified liquid can flow into the post-positioned sludge denitrification area, the muddy water mixed liquid entering the circulating ditch system and the muddy water mixed liquid entering the post-positioned sludge denitrification area flow out from the sludge membrane enhanced nitrification area in a reverse direction, the flow is reduced mutually, and the hydraulic load of the screen is reduced mutually.

5) The reasonable arrangement mode of the post-sludge denitrification area and the post-oxygenation area ensures that the total nitrogen in the effluent reaches the higher standard of the national standard.

Drawings

Fig. 1 is a schematic view of the planar structure of the present invention.

Fig. 2 is a sectional view a-a of the schematic plan structural layout of the present invention.

Wherein: 1. the device comprises a sludge anoxic zone, 2, arc-shaped guide walls, 3, vertical separation guide walls, 4, a gas stripping push flow zone, 5, a sludge membrane enhanced nitrification zone, 6, a rear sludge denitrification zone, 7, a rear oxygen charging zone, 8, a water inlet pipe orifice, 9, a return sludge pipe orifice, 10, a walkway plate, 11, an anoxic zone impeller, 12, a gas stripping gas supply vertical pipe, 13, a gas stripping aerator system, 14, a gas stripping zone front partition wall, 15, a gas stripping zone rear partition wall, 16, an aerator system, 17, a suspension carrier, 18, a roller screen, 19, a vertical flat screen, 20, a stirrer, 21, a water outlet pipe orifice, 22 and a carbon source feeding pipe orifice.

Detailed Description

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

As shown in fig. 1 and 2.

A device for enhancing the effect of a gas stripping plug-flow type oxidation ditch by using a suspended carrier comprises a sludge anoxic zone 1, an arc-shaped guide wall 2, a vertical separation guide wall 3, a gas stripping plug-flow zone 4, a mud film enhanced nitrification zone 5, a post-positioned sludge denitrification zone 6 and a post-positioned oxygenation zone 7, wherein the sludge anoxic zone 1 is communicated with the gas stripping plug-flow zone 4 through a water through hole at the bottom of a front partition wall of the gas stripping zone, and the sludge anoxic zone 1 is provided with a water inlet pipe orifice 8, a return sludge pipe orifice 9 and an anoxic zone plug-flow device 11 of which a hoisting device is arranged on a walkway plate 10; the arc-shaped guide wall 2 is positioned at the end of a circulating flow channel of the biochemical treatment device; the vertical separation guide wall 3 is positioned in the middle of a circulating flow channel of the biochemical treatment device; the air-lifting thrust zone 4 is communicated with the sludge anoxic zone 1 through a water through hole at the bottom of a front partition wall 14 of the air-lifting zone, the air-lifting thrust zone 4 is also communicated with the sludge membrane enhanced nitrification zone 5 through a water through hole at the top of a rear partition wall 15 of the air-lifting zone, and the air-lifting thrust zone 4 is provided with an air-lifting air-supplying vertical pipe 12 and an air-lifting aerator system 13 required by mud-water mixed liquid thrust; the sludge membrane enhanced nitrification area 5 is communicated with the sludge anoxic area 1 through circular water passing holes on a partition wall behind the drum screen 18, the sludge membrane enhanced nitrification area 5 is also communicated with the post-sludge denitrification area 6 through rectangular water passing holes on a partition wall behind the vertical flat screen 19, and an aerator system 16 and a suspension carrier 17 are arranged in the sludge membrane enhanced nitrification area 5; the post-sludge denitrification area 6 is communicated 7 with the post-oxygenation area through a water through hole at the bottom of the outer end of the middle partition wall, and a stirrer 20 and a carbon source feeding pipe orifice 22 are arranged in the post-sludge denitrification area 6; an aerator system 16 and a water outlet pipe orifice 21 are arranged in the post-aeration zone 7.

The stripping aerator system 13 is arranged in a ring.

The sludge membrane enhanced nitrification area 5 is simultaneously provided with a roller screen 18 through which most of nitrification liquid can flow and enter the sludge anoxic area 1, and a vertical flat screen 19 through which the rest of nitrification liquid can flow and enter the post-sludge denitrification area 6.

The technical scheme of the utility model includes following step:

1) the influent water enters the sludge anoxic zone through the water inlet pipe orifice and the return sludge enters the sludge anoxic zone through the return sludge pipe orifice respectively, and after the influent water is mixed with the sludge water from the sludge membrane enhanced nitrification zone, the biochemical denitrification is realized in the sludge anoxic zone.

2) Muddy water in the sludge anoxic zone enters the air stripping thrust zone through water holes at the bottom of the front partition wall of the air stripping zone, and muddy water mixed liquor enters the sludge membrane enhanced nitrification zone through the top end of the rear partition wall of the air stripping zone under the aeration action of the air stripping aerator system.

3) In the sludge membrane enhanced nitrification area, under the pushing of the aerator system and the action of the aerator system, the biological membrane growing on the suspension carrier and microorganisms in the activated sludge carry out sufficient biochemical nitrification on the ammonia nitrogen in the sewage; most of the nitrified liquid enters the sludge anoxic zone through the roller screen to be mixed with the inlet water and the return sludge, and the other part of the nitrified liquid enters the post-sludge denitrification zone through the vertical flat screen.

4) Adding an external carbon source into the post-sludge denitrification area through a carbon source adding pipe orifice arranged on the post-sludge denitrification area, and further denitrifying and removing nitrate in the mud water flowing into the post-sludge denitrification area, so that the total nitrogen of the effluent water quality meets a higher standard; muddy water in the rear sludge denitrification area flows into the rear oxygenation area through the water passing holes at the bottom of the outer side end of the middle partition wall, so that residual carbon sources possibly added in the muddy water in the rear sludge denitrification area are further removed, COD (chemical oxygen demand) and BOD (biochemical oxygen demand) of the discharged water are ensured to reach the standard, and the muddy water with enough dissolved oxygen can be ensured to enter a subsequent treatment facility.

Example one:

the treatment scale of a municipal sewage plant in a certain city is 10000 tons/day, sewage enters the process system after primary treatment, the COD concentration of the inlet water is 330mg/L, the BOD concentration is 110mg/L, the ammonia nitrogen concentration is 35mg/L, the total nitrogen is 50mg/L, the total phosphorus concentration is 5mg/L, by adopting the scheme of the utility model, the HRT of the sludge anoxic zone is 3.5h, the HRT of the air stripping thrust zone is 15min, the HRT of the sludge membrane enhanced nitrification zone is 3.0h, the HRT of the post-sludge denitrification zone is 1.0h, the HRT of the post-aeration zone is 0.5h, the suspension carrier added in the MBBR aerobic zone has the diameter of 25mm and the height of 10mm, is made of HDPE material, the effective specific surface area is not less than 500 square meters/m, the BOD of the outlet water after four months of cylindrical operation is not more than 5mg/L, the COD of the outlet water is not more than 40mg/L, the ammonia nitrogen is not more than 1mg/L, the ammonia nitrogen and the total phosphorus in the effluent of the system always keep stable and reach the standard.

The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.

Claims

1. A device for enhancing the effect of a gas stripping plug-flow type oxidation ditch by using a suspended carrier is characterized by comprising a sludge anoxic zone, an arc-shaped guide wall, a vertical separation guide wall, a gas stripping plug-flow zone, a mud film enhanced nitrification zone, a post-positioned sludge denitrification zone and a post-positioned oxygenation zone, wherein the sludge anoxic zone is communicated with the gas stripping plug-flow zone through a water through hole at the bottom of a front partition wall of the gas stripping zone, and the sludge anoxic zone is provided with a water inlet pipe orifice, a return sludge pipe orifice and an anoxic zone plug-flow device of which a hoisting device is arranged on a walkway plate; the arc-shaped guide wall is positioned at the end of the circulating flow channel of the biochemical treatment device; the vertical separation guide wall is positioned in the middle of the circulating flow channel of the biochemical treatment device; the air-lifting thrust zone is communicated with the sludge anoxic zone through a water hole at the bottom of the front partition wall of the air-lifting zone, is also communicated with the sludge membrane enhanced nitrification zone through a water hole at the top of the rear partition wall of the air-lifting zone, and is provided with an air-lifting air supply vertical pipe and an air-lifting aerator system required by mud-water mixed liquid thrust; the sludge membrane enhanced nitrification area is communicated with the sludge anoxic area through a circular water through hole on a partition wall behind the drum screen, the sludge membrane enhanced nitrification area is also communicated with the post-positioned sludge denitrification area through a rectangular water through hole on a partition wall behind the upright flat screen, and an aerator system and a suspension carrier are arranged in the sludge membrane enhanced nitrification area; the post-sludge denitrification area is communicated with the post-oxygenation area through a water through hole at the bottom of the outer end of the middle partition wall, and a stirrer and a carbon source feeding pipe orifice are arranged in the post-sludge denitrification area; an aerator system and a water outlet pipe orifice are arranged in the post-positioned oxygen charging area.

2. The apparatus for enhancing the effect of a gas stripping plug flow type oxidation ditch by using suspension carriers as claimed in claim 1, wherein the sludge membrane enhanced nitrification zone is simultaneously provided with a roller screen through which most of the nitrification liquid can flow into the sludge anoxic zone and a vertical flat screen through which the rest of the nitrification liquid can flow into the post-positioned sludge denitrification zone.