CN113860498A - HC-MBBR (hydrogen chloride-moving bed biofilm reactor) process for enhanced nitrogen and phosphorus removal of sewage - Google Patents
HC-MBBR (hydrogen chloride-moving bed biofilm reactor) process for enhanced nitrogen and phosphorus removal of sewage Download PDFInfo
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- CN113860498A CN113860498A CN202111205899.7A CN202111205899A CN113860498A CN 113860498 A CN113860498 A CN 113860498A CN 202111205899 A CN202111205899 A CN 202111205899A CN 113860498 A CN113860498 A CN 113860498A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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Abstract
The invention relates to the technical field of sewage treatment, in particular to an HC-MBBR (hydrocarbon-moving bed biofilm reactor) process for strengthening nitrogen and phosphorus removal of sewage.A specially designed soft biological filler can be suspended in a reaction tank through aeration stirring, liquid reflux or mechanical mixing and forms a fluidized state, an interception net and an air stripping reflux device are arranged at the water outlet end of the reaction tank, the filler is intercepted in the reaction tank for cyclic utilization, and the treated water enters the next unit; the HC-MBBR tank body can be in a concrete structure and steel structure form, and the HC-MBBR process can be divided into three types of tanks according to different requirements for removing pollutants: the anaerobic pool, the anoxic pool and the aerobic pool can remove COD, wherein the anaerobic HC-MBBR mainly removes total phosphorus, the anoxic HC-MBBR removes total nitrogen, the aerobic HC-MBBR removes ammonia nitrogen, and the pool bodies can be designed to operate in parallel; the invention can respectively realize the removal of COD, ammonia nitrogen, total nitrogen and total phosphorus, meets different effluent quality standards including strict denitrification and dephosphorization requirements, and simultaneously ensures higher removal rate of pollutants.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an HC-MBBR (hydrogen chloride-moving bed biofilm reactor) process for enhanced nitrogen and phosphorus removal of sewage.
Background
The MBBR moving bed biofilm reactor moving-bed-bifilm-reactor, MBBR for short, was invented at the end of the 80 s and is applied in Europe quickly, and it absorbs the advantages of the traditional activated sludge process and the biological contact oxidation process to become a novel and efficient composite process. The core part is that suspended filler with specific gravity close to water is directly added into an aeration tank to be used as an active carrier of microorganisms, the active carrier is in a fluidized state under the aeration of the aeration tank and the lifting action of water flow, and when the microorganisms are attached to the carrier, the floating carrier freely moves along with the convolution and turning action of mixed liquid in a reactor, thereby achieving the purpose of sewage treatment. As a process combining an activated sludge method of suspension growth and a biofilm method of attachment growth, the MBBR method has the advantages of the two methods: the occupied area is small, and the device only needs 20-40% of the volume of a common oxidation pond under the same load condition; microorganisms are attached to the carrier and flow along with water flow, so that activated sludge backflow or circulating back washing is not needed; the carrier organisms continuously fall off to avoid blockage; the organic load is high, the impact load resistance is strong, so the effluent quality is stable; the water head loss is small, the power consumption is low, the operation is simple, and the operation and the management are easy; is suitable for new construction and reconstruction engineering of sewage.
The common biological fillers used in the traditional MBBR process comprise polyethylene, polypropylene and modified materials thereof, the shapes of the fillers are mostly flat structures, and the specific surface area of the fillers is not large enough and is usually less than 700m2/m3The affinity to water is poor, so that the film hanging time is long, and the growth and the propagation of microorganisms are not facilitated; and the excessively flat structure determines that the filler resistance is too large in the operation process, the filler is easy to accumulate at the bottom of the tank, and a better fluidization state cannot be formed.
In combination with the actual project operation conditions, the conventional MBBR process has the following problems: the volume load of the tank body is relatively low, the capability of packing and hanging the membrane is poor, the packing is easy to fluidize and accumulate, and the packing is easy to run off and block the blocking net.
Disclosure of Invention
The invention aims to provide an HC-MBBR (hydrocarbon-based moving bed biofilm reactor) process for enhanced nitrogen and phosphorus removal of sewage, which is characterized in that a specially designed soft biological filler is used, the filler can be suspended in a reaction tank through aeration stirring, liquid backflow or mechanical mixing and forms a fluidized state, an interception net and an air-stripping backflow device are arranged at the water outlet end of the reaction tank, the filler is intercepted in the reaction tank for cyclic utilization, and treated water enters the next unit;
the HC-MBBR tank body can be in a concrete structure and steel structure form, and the HC-MBBR process can be divided into three types of tanks according to different requirements for removing pollutants: the anaerobic pool, the anoxic pool and the aerobic pool can remove COD, wherein the anaerobic HC-MBBR mainly removes total phosphorus, the anoxic HC-MBBR pool removes total nitrogen, the aerobic HC-MBBR pool removes ammonia nitrogen, and the pool bodies can be designed to operate in parallel.
Optionally, the anaerobic and anoxic HC-MBBR tank comprises a water inlet pipe, a tank body, a suspended filler, a stirrer, a water outlet intercepting net and purging device, a water outlet channel and a water outlet pipe, wherein the water outlet intercepting net and purging device are located on one side inside the anaerobic and anoxic HC-MBBR tank, the suspended filler is arranged inside the anaerobic and anoxic HC-MBBR tank, and the water outlet channel is arranged on one side, close to the water outlet pipe, of the anaerobic and anoxic HC-MBBR tank.
Optionally, the aerobic HC-MBBR tank comprises a water inlet pipe, a tank body, a suspended filler, an aerator pipe, a water outlet intercepting net and purging device, a water outlet channel and a water outlet pipe, wherein the water outlet intercepting net and purging device are located on one side of the interior of the aerobic HC-MBBR tank, the suspended filler is located in the aerobic HC-MBBR tank, and the water outlet channel is arranged on one side of the aerobic HC-MBBR tank close to the water outlet pipe.
Optionally, the suspended filler is a modified polyurethane-based polymer composite hydrophilic material, and the suspended filler is composed of a combined filler.
Optionally, the combined filler is composed of two parts, the outer part is a spherical suspended filler formed by injection molding of polypropylene or polyethylene, and the interior of the sphere is filled with the modified polyurethane polymer composite hydrophilic filler and the volcanic rock counterweight.
Optionally, a filler intercepting net is designed at the water outlet of the HC-MBBR tank, and a scavenging device of the intercepting net belt adopts air scavenging.
Optionally, the stirrer is arranged at the bottom of the anaerobic HC-MBBR tank/anoxic HC-MBBR tank.
Optionally, the filler intercepting net comprises three water outlet intercepting nets, a blowing device and a suspended filler.
Optionally, the reaction tank comprises a water outlet interception net, a purging device, a suspended filler, a flow impeller and a guide wall.
Optionally, the gas stripping reflux device comprises an effluent interception net, a purging device, a gas stripping device, a filler reflux pipe and a suspended filler.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can be successfully used for carbon oxidation, nitrification and denitrification through HC-MBBR tanks with different configurations, can respectively remove COD, ammonia nitrogen, total nitrogen and total phosphorus, meets different effluent water quality standards including strict requirements on nitrogen and phosphorus removal, is suitable for industrial wastewater such as paper-making wastewater, food industry wastewater, slaughter wastewater, oil refining wastewater and the like, and can also treat urban domestic sewage, mixed sewage of the urban wastewater and the industrial wastewater and upgrade and reconstruction of sewage plants.
2. The modified polyurethane polymer composite hydrophilic filler of HC-MBBR has the specific gravity close to that of water, is easy to form a film, is not agglomerated or blocked and is easy to demould. The filler has high porosity, the specific surface area is about 5-10 times of that of the traditional filler, the biological adhesion is strong, the chemical and biological stability is good, the porosity of the internal carrier is more than 98%, microorganisms can be effectively fixed, the microorganism adhesion amount is increased, the concentration of the microorganisms fixed on the carrier can reach 20-30g/L dry weight, and therefore the high removal rate of pollutants is ensured; under the same load condition, the HC-MBBR only needs 20-40% of the volume of the biochemical pool of the traditional activated sludge method. Even under an aerobic environment, the single carrier sequentially has aerobic, facultative, anoxic and anaerobic environments from outside to inside, and can simultaneously realize the removal of ammonia nitrogen, total nitrogen and COD.
3. According to the invention, the HC-MBBR has stronger impact load resistance, and because part or all of HC-MBBR microorganisms, especially nitrifying bacteria exist in an attached state, the nitrifying bacteria have small impact resistance influence, can resist stronger impact, and can quickly recover the effect after the impact exceeds the designed load.
4. The HC-MBBR process belongs to a mud film mixing method, so that the output of excess sludge is obviously reduced; because the microorganism is attached to the carrier and flows along with the water flow, the sludge backflow or the circular back washing is reduced, and the energy consumption is lower.
Drawings
FIG. 1 is a diagram of the structural form of the anaerobic HC-MBBR tank/anoxic HC-MBBR tank of the present invention;
FIG. 2 is a structural form diagram of an aerobic HC-MBBR tank according to the present invention;
FIG. 3 is a plan view of HC-MBBR of the present invention with a packing interception net inside the reaction tank;
FIG. 4 is a plan view of HC-MBBR with guide walls and a flow driver inside the reaction tank according to the present invention;
FIG. 5 is a sectional view of HC-MBBR in the reactor of the present invention with a filler stripping reflux unit.
The objects, features, and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides an HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage, in which a specially designed soft biological filler is stirred by aeration, liquid reflux or mechanical mixing to make the filler suspended in a reaction tank and form a fluidized state, an interception net and a gas stripping reflux device are arranged at a water outlet end of the reaction tank to intercept the filler in the reaction tank for cyclic utilization, and treated water enters a next unit;
the HC-MBBR tank body can be in a concrete structure and steel structure form, and the HC-MBBR process can be divided into three types of tanks according to different requirements for removing pollutants: the anaerobic pool, the anoxic pool and the aerobic pool can remove COD, wherein the anaerobic HC-MBBR mainly removes total phosphorus, the anoxic HC-MBBR removes total nitrogen, the aerobic HC-MBBR removes ammonia nitrogen, and the pool bodies can be designed to operate in parallel;
the anaerobic HC-MBBR tank, the anoxic HC-MBBR tank and the aerobic HC-MBBR tank are different in that the anaerobic HC-MBBR tank and the anoxic HC-MBBR tank are provided with stirrers, the stirrers are used for fluidizing the filler, and the anoxic HC-MBBR tank and the aerobic HC-MBBR tank are used for fluidizing the filler by blast aeration and simultaneously providing oxygen required by aerobic microorganisms. The HC-MBBR is flexible in operation, and a plurality of reaction sections can be sequentially arranged along the water flow direction to meet various treatment targets of anaerobic treatment, carbon oxidation, nitrification, pre-denitrification or post-denitrification.
Referring to fig. 1, 2 and 3, the anaerobic and anoxic HC-MBBR tank comprises a water inlet pipe, a tank body 1 and a suspended filler 4, the device comprises a stirrer 2, an outlet water interception net and blowing device 3, an outlet channel 5 and an outlet pipe, wherein the outlet water interception net and blowing device 3 is positioned on one side of the inside of an anaerobic and anoxic HC-MBBR pool, a suspended filler 4 is arranged inside the anaerobic and anoxic HC-MBBR pool, the outlet channel 5 is arranged on one side of the anaerobic and anoxic HC-MBBR pool close to the outlet pipe, the suspended filler 4, the suspended filler 8, the suspended filler 11 and the suspended filler 13 are all modified polyurethane-based polymer composite hydrophilic materials, the HC-MBBR suspended filler is usually a modified polyurethane-based polymer composite hydrophilic material, the size of a carrier is 20mm-35mm cube, the density is close to water, the porosity of the carrier is more than 98%, and the specific surface area is more than 4500 m.2/m3The microbial load is 20-30 g/L; the filling rate of the combined filler is determined according to the actual process flow and the water quality of inlet and outlet water, and is generally 15-30%. The suspended filler 4 mainly plays a role of a biological carrier and also has a function of cutting bubbles, so that the retention time of the bubbles can be prolonged, and the utilization rate of oxygen is improved. The suspension filler 4 can also adopt a combined filler, the combined filler 4 is composed of two parts, the external part is a spherical suspension filler formed by injection molding of polypropylene or polyethylene, the diameter of the sphere is 100mm or 80mm, the interior of the sphere is filled with the modified polyurethane polymer composite hydrophilic filler and the volcanic balance weight, the filling rate of the combined filler is usually fluctuated within the range of 15% -50%, the suspension filler 4, the suspension filler 8, the suspension filler 11 and the suspension filler 13 are all made of the combined filler, the combined filler is composed of two parts, the external part is the spherical suspension filler formed by injection molding of polypropylene or polyethylene, and the interior of the sphere is filled with the modified polyurethane polymer composite hydrophilic fillerThe filler and the volcanic rock are weighted, and the stirrer 2 is arranged at the bottom of the anaerobic HC-MBBR pool/anoxic HC-MBBR pool; the filler is fluidized by the plug flow action of the stirrer 2, and the microbial reactor attached to the filler freely moves along with the convolution and turnover action of the mixed liquid, so that the aim of sewage treatment is fulfilled. The bottom of the aerobic HC-MBBR tank can be respectively selected from a perforated aeration pipe, a micropore aerator or a rotational flow aerator according to design requirements, and the filler is fluidized under the action of aeration and water flow lifting. Each aeration pipeline of the lattice tank body is arranged into a loop.
Referring to fig. 2, the aerobic HC-MBBR tank comprises a water inlet pipe, a tank body 6, a suspended filler 8, an aeration pipe, a water outlet interception net and purging device 7, a water outlet channel 9 and a water outlet pipe, wherein the water outlet interception net and purging device 7 is positioned on one side of the interior of the aerobic HC-MBBR tank, the suspended filler 8 is positioned in the aerobic HC-MBBR tank, and the water outlet channel 9 is arranged on one side of the aerobic HC-MBBR tank close to the water outlet pipe.
Referring to fig. 4 and 5, a filler intercepting net and an intercepting net belt blowing device are designed at a water outlet of the HC-MBBR tank, the blowing device adopts air blowing, the filler intercepting net comprises three water outlet intercepting nets and blowing devices 10 and a suspended filler 11, the inside of the reaction tank comprises a water outlet intercepting net and blowing device 12, a suspended filler 13, a flow impeller 14 and a guide wall 15, and the air stripping reflux device comprises a water outlet intercepting net and blowing device 16, an air stripping device 17, a filler reflux pipe 19 and a suspended filler 19; the aperture of the interception net is less than or equal to 5mm, the interception net belt blowing device adopts air blowing to avoid the filler from being accumulated on the screen interception net, and the water passing is ensured to be smooth.
Optimizing and designing a reaction tank:
1, designing a plurality of filler intercepting nets and blowing devices inside the reaction tank, dividing the tank body into a plurality of grids, and controlling the length-width ratio of each grid to be 1: 1-2: 1.
2, designing a flow impeller 14 and a guide wall 15 in a suspension carrier adding area to ensure that the filler circularly flows in the whole tank, and realizing fluidization of the filler under the comprehensive driving of aeration and the flow impeller 14.
3 if the MBBR is an aerobic tank, a gas stripping reflux device can be arranged at the tail end of the reaction tank, so that the filler forms fluidization under the combined action of water flow and the gas stripping device.
The invention adopts high-porosity light biological filler, so the loss of the water head of the filler area is very small, and the energy consumption is low; the HC-MBBR filler modified hydrophilic filler sinks quickly when meeting water and is easy to fluidize; and the bottom of the tank can adopt perforation aeration, thereby effectively avoiding the floating of the filler caused by the attachment of microbubbles of the traditional aerator to the pores of the filler, solving the problems of floating and accumulation of the traditional hydrophobic filler and leading the filler to be in a better fluidization state. Meanwhile, the oxygen utilization rate can be improved by the action of the suspended filler 4 for cutting bubbles, and the problem of low perforating aeration efficiency is solved; the HC-MBBR tank adopts high-porosity light biological packing, so that the water head loss is small, the energy consumption is low, the operation is simple, and the operation and the management are convenient. The filler is always in a fluidized state, so that the filler is not blocked and does not need to be backwashed; the modified biological filler has high durability and strong abrasion resistance, the annual wear rate is less than or equal to 6 percent, the service life is not less than 15 years, and the operation cost is greatly reduced; a filler interception net, a purging device and an air stripping reflux device are designed at the water outlet of the HC-MBBR tank, so that the phenomenon of accumulation or material running of the filler on the screen interception net is avoided, and the uniform distribution of the filler in the reaction tank is ensured; the HC-MBBR process is flexible and simple in design and operation, is suitable for different types of tank types, has strong compatibility with other processes, and can be used for most processes such as A in the established sewage treatment plant2O, AO, SBR, CASS, an oxidation ditch method and the like, and the discharge requirement is met by adding hydrophilic suspended filler into the original active biochemical pool only without greatly changing civil engineering and equipment. Greatly saves the occupied land and the investment cost, and solves the problem of insufficient land for upgrading and transforming the sewage treatment plant.
While the invention has been described in further detail in connection with specific embodiments thereof, it will be understood that the invention is not limited thereto, and that various other modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be considered to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. An HC-MBBR technology for strengthening nitrogen and phosphorus removal of sewage is characterized in that: the method comprises the following steps of (1) suspending a filler in a reaction tank by using a specially designed soft biological filler through aeration stirring, liquid reflux or mechanical mixing, forming a fluidized state, arranging an interception net and a gas stripping reflux device at the water outlet end of the reaction tank, intercepting the filler in the reaction tank for cyclic utilization, and allowing treated water to enter the next unit;
the HC-MBBR tank body can be in a concrete structure and steel structure form, and the HC-MBBR process can be divided into three types of tanks according to different requirements for removing pollutants: the anaerobic pool, the anoxic pool and the aerobic pool can remove COD, wherein the anaerobic HC-MBBR mainly removes total phosphorus, the anoxic HC-MBBR pool removes total nitrogen, the aerobic HC-MBBR pool removes ammonia nitrogen, and the pool bodies can be designed to operate in parallel.
2. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: the anaerobic and anoxic HC-MBBR tank comprises a water inlet pipe, a tank body, a suspended filler, a stirrer, a water outlet interception net and purging device, a water outlet channel and a water outlet pipe, wherein the water outlet interception net and purging device is positioned on one side inside the anaerobic and anoxic HC-MBBR tank, the suspended filler is arranged inside the anaerobic and anoxic HC-MBBR tank, and the water outlet channel is arranged on one side, close to the water outlet pipe, of the anaerobic and anoxic HC-MBBR tank.
3. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: the aerobic HC-MBBR tank comprises a water inlet pipe, a tank body, a suspended filler, an aerator pipe, a water outlet interception net and purging device, a water outlet channel and a water outlet pipe, wherein the water outlet interception net and purging device is positioned on one side of the interior of the aerobic HC-MBBR tank, the suspended filler is positioned in the aerobic HC-MBBR tank, and the water outlet channel is arranged on one side of the aerobic HC-MBBR tank close to the water outlet pipe.
4. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 2, wherein: the suspended filler is a modified polyurethane-based polymer composite hydrophilic material and is formed by combined fillers.
5. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 4, wherein: the combined filler consists of two parts, the outside is spherical suspended filler formed by injection molding of polypropylene or polyethylene, and the interior of the sphere is filled with modified polyurethane polymer composite hydrophilic filler and volcanic rock balance weight.
6. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: a filler interception net is designed at a water outlet of the HC-MBBR tank, and an interception net belt blowing device adopts air blowing.
7. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 2, wherein: the stirrer is arranged at the bottom of the anaerobic HC-MBBR tank/anoxic HC-MBBR tank.
8. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: the filler intercepting net comprises three water outlet intercepting nets, a blowing device and a suspended filler.
9. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: the reaction tank comprises a water outlet interception net, a blowing device, a suspension filler, a flow impeller and a guide wall.
10. The HC-MBBR process for enhanced nitrogen and phosphorus removal of sewage according to claim 1, wherein: the gas stripping reflux device comprises a water outlet interception net, a blowing device, a gas stripping device, a filler reflux pipe and a suspended filler.
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