CN214528643U - Preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge - Google Patents
Preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge Download PDFInfo
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Abstract
The utility model provides a preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge, which consists of a water inlet aeration unit, an activated sludge reaction unit and a temperature control unit; the water inlet aeration unit can keep the anaerobic condition of water inlet required by the process for a long time; the activated sludge reaction unit is provided with a stirring device and a three-phase separator, so that the activated sludge can be fully mixed with inlet water, the sludge, water and gas of outlet water can be separated, the activated sludge is prevented from flowing out along with the outlet water, and the sludge is effectively retained; the water bath interlayer arranged on the temperature control unit and the super constant temperature water bath can meet the reaction temperature condition. Meanwhile, in the reaction process, the mature and stable Feammox functional sludge can be cultured by continuously changing the concentration of the iron ions in the inlet water when the fed water is acclimated for about 70 days, and the seed sludge is taken from an anaerobic pool of a sewage plant, so that the cost is low and the materials are easy to obtain. The utility model discloses a mud source has higher cost advantage, and the acclimatization time is with traditional technology phase difference not much.
Description
Technical Field
The utility model relates to a sewage treatment technical field, in particular to domesticate anaerobic digestion mud to preparation facilities of Feammox function mud.
Background
China is in the development stage of industrialization and urbanization, and environmental problems caused by huge incremental pressure of pollutant emission are difficult to ignore. After the 'source control and emission reduction' is implemented nationwide, the organic pollution of the wastewater is effectively treated, the nitrogen and phosphorus pollution is increased to be a main environmental problem, the caused water eutrophication is the most typical and basically irreversible water environmental pollution problem, the health and the safety of human beings and other living bodies are seriously threatened, and the problem of water resource shortage caused by the pollution becomes one of important factors which seriously influence and restrict the high-speed development of the economy of China. The traditional biological denitrification process with high energy consumption and low efficiency can not meet the actual requirements, and the development of a sewage autotrophic biological denitrification treatment technology with low energy consumption, high efficiency and stable sustainable development is urgently needed.
Anaerobic Ammonium Oxidation (Feammox) is a microorganism-mediated anaerobic Ammonium Oxidation under iron reduction conditions, and is a newly discovered nitrogen circulation mode in recent years, which is a combination of earth nitrogen circulation and iron circulation and is commonly found in river banks, wetlands, paddy fields and other environments. The anaerobic iron ammoxidation process is used as an autotrophic biological denitrification process, accords with the future development direction of sewage treatment, and has a relatively high application prospect. At present, the application of an anaerobic iron ammoxidation process in sewage treatment is still in an incomplete test stage, anaerobic ammoxidation (Anammox) sludge is generally adopted in the selection of sludge, the anaerobic ammoxidation process is easily influenced by environmental factors, and the defect of long multiplication time of Anammox bacteria exists, so that the defects of high acclimation cost, long preparation period and the like of Anammox sludge are caused, and the method is not suitable for being used as the optimal selection of the Feammox sludge; meanwhile, the UASB reactor which is commonly adopted in the selection of the reaction device has the problems of insufficient mixing of muddy water, easy blockage of a three-phase separator and incapability of keeping the water inlet anaerobic condition for a long time, and causes unsatisfactory starting and running processes of the process.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model aims to provide a preparation device for acclimating anaerobic digestion sludge into Feammox functional sludge; the specific technical scheme is as follows:
a preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge comprises a water inlet aeration unit, an activated sludge reaction unit and a temperature control unit;
the water inlet aeration unit consists of a nitrogen cylinder, a gas flowmeter, an aeration disc, a water inlet barrel, a gas collecting bag, a gas washing bottle and a water inlet pump;
the nitrogen cylinder is connected with the gas flowmeter, then enters the water inlet barrel through the small hole through the pneumatic PU pipe, and is connected with the aeration disc;
the air collecting bag and the air washing bottle are connected with the water inlet barrel through a three-way ball valve and are respectively arranged at two ends of the three-way ball valve;
one end of the water inlet pump is connected with the water inlet barrel, and the other end of the water inlet pump is connected with the activated sludge reaction unit.
The preparation device for acclimating anaerobic digestion sludge into Feammox functional sludge has the preferred scheme that the active sludge reaction unit consists of a CSTR reactor, a three-phase separator, a speed regulator and a water outlet pool;
the CSTR reactor comprises a top cover, a bottom cover, a motor and a stirring paddle, and the main material is organic glass;
the top cover, the bottom cover and the motor are all connected by flanges, and the stirring paddle is connected to the lower end of the motor by a stainless steel coupler;
a water inlet and a sludge discharge port are arranged below the CSTR reactor, 3 sampling ports are arranged in the middle effective reaction area, a water outlet is arranged at the middle upper part, an exhaust port is arranged above the middle upper part, a check valve is arranged at the water inlet, and ball valves are arranged at the sludge discharge port, the sampling ports and the water outlet; the ball valve on the water outlet is connected with the PVC hose, and the outlet water flows into the water outlet pool through the PVC hose;
the motor drives the stirring paddle to stir the muddy water, and the speed regulator is connected with the motor and used for controlling the stirring speed;
the three-phase separator is bonded to the bottom of the CSTR cover.
The preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge has the preferable scheme that the temperature control unit comprises a water bath interlayer and a super constant-temperature water bath;
the water bath interlayer wraps the outer side of an effective reaction area of the CSTR reactor, two ball valves are arranged at the upper part and the lower part and are connected with the super constant temperature water bath through PVC hoses, warm water enters the water bath interlayer from the lower ball valve from the super constant temperature water bath, then flows back through the upper ball valve, and the temperature is controlled through circulating flow.
The preferable scheme of the preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge is that the three-phase separator is cylindrical, is made of organic glass and has an inner diameter of 170 mm.
The preferable scheme of the preparation device for acclimatizing the anaerobic digestion sludge into the Feammox functional sludge is that the CSTR reactor is mainly made of organic glass, the effective volume is about 5L, the inner diameter is 140mm, the effective height-diameter ratio is about 2.3: 1, and a water passing mode of downward entering and upward exiting is adopted.
The utility model has the advantages that: the gas collecting bag arranged in the water inlet aeration unit in the reactor device can store nitrogen, can feed water at the beginning of the process, and can carry out nitrogen recharging on the space in the water inlet barrel in the reaction process, thereby maintaining the anaerobic condition of water inlet required by the process for a longer time; the selected CSTR reactor can fully mix the activated sludge and the inlet water, and the added cylindrical three-phase separator can realize the separation of the sludge, water and gas of the outlet water, prevent the activated sludge from flowing out along with the outlet water and effectively retain the sludge; the water bath interlayer arranged on the temperature control unit and the super constant temperature water bath can meet the reaction temperature condition. Meanwhile, in the reaction process, the mature and stable Feammox functional sludge can be cultured by continuously changing the concentration of the iron ions in the inlet water when the fed water is acclimated for about 70 days, and the seed sludge is taken from an anaerobic pool of a sewage plant, so that the cost is low and the materials are easy to obtain. Compare as the seed mud source with traditional Anammox reactor mud, the utility model discloses a mud source has higher cost advantage, and the acclimation time is with traditional technology phase difference not much.
Drawings
FIG. 1 is a schematic structural diagram of a reaction device for an anaerobic iron ammoxidation process;
FIG. 2 is a graph of the change in trinitrogen content of a Feammox reactor;
FIG. 3 is a graph showing the change in iron ion content in the Feammox reactor.
In the figure: 1. a nitrogen gas cylinder; 2. a gas flow meter; 3. a water inlet barrel; 4. an aeration disc; 5. an air collecting bag; 6. a gas washing bottle; 7. a water inlet pump; 8. a stirring paddle; 9. a three-phase separator; 10. a motor; 11. a speed regulator; 12. a water outlet pool; 13. water bath interlayer; 14. super constant temperature water bath; 15. A CSTR reactor; 16. a water inlet; 17. a sludge discharge port; 18. a sampling port; 19. a water outlet; 20. an exhaust port; 21. an effective reaction zone; 22. a top cover; 23. a bottom cover.
Detailed Description
The following further description of the present invention will be made with reference to the drawings, but it should not be understood that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications can be made without departing from the spirit of the invention and the scope of the invention as defined by the appended claims.
As shown in fig. 1-3, the utility model aims to provide a reaction device for an anaerobic iron ammoxidation process, which comprises a water inlet aeration unit, an activated sludge reaction unit and a temperature control unit;
the water inlet aeration unit consists of a nitrogen cylinder 1, a gas flowmeter 2, an aeration disc 4, a water inlet barrel 3, a gas collecting bag 5, a gas washing bottle 6 and a water inlet pump 7;
the nitrogen cylinder 1 is connected with the gas flowmeter 2, then enters the water inlet barrel 3 through the small hole by a pneumatic PU pipe, and is connected with the aeration disc 4;
the gas collecting bag 5 and the gas washing bottle 6 are connected with the water inlet barrel 3 through a three-way ball valve and are respectively arranged at two ends of the three-way ball valve;
one end of the water inlet pump 7 is connected with the water inlet barrel 3, and the other end is connected with the activated sludge reaction unit.
The activated sludge reaction unit consists of a CSTR reactor 15, a three-phase separator 9, a speed regulator 11 and a water outlet pool 12;
the CSTR reactor 15 comprises a top cover 22, a bottom cover 23, a motor 10 and a stirring paddle 8, and the main material is organic glass;
the top cover 22, the bottom cover 23 and the motor 10 are all connected by flanges, and the stirring paddle 8 is connected to the lower end of the motor 10 by a stainless steel coupler;
a water inlet 16 and a sludge discharge port 17 are arranged below the CSTR reactor 15, 3 sampling ports 18 are arranged in a middle effective reaction area 21, a water outlet 19 is arranged at the middle upper part, an exhaust port 20 is arranged above the middle effective reaction area, a check valve is arranged at the water inlet 16, and ball valves are arranged at the sludge discharge port 17, the sampling ports 18 and the water outlet 19; the ball valve on the water outlet 19 is connected with a PVC hose, and the outlet water flows into the water outlet pool 12 through the PVC hose;
the motor 10 drives the stirring paddle 8 to stir the muddy water, and the speed regulator 11 is connected with the motor 10 and used for controlling the stirring speed;
the three-phase separator 9 is bonded to the underside of the CSTR header.
The temperature control unit comprises a water bath interlayer 13 and a super constant temperature water bath 14;
the water bath interlayer 13 is wrapped outside an effective reaction area of the CSTR reactor, two ball valves are respectively arranged at the upper part and the lower part and are connected with the super constant temperature water bath 14 through PVC hoses, warm water enters the water bath interlayer 13 from the lower ball valve from the super constant temperature water bath 14 and then flows back through the upper ball valve, and the temperature is controlled through circulating flow.
The three-phase separator 9 is cylindrical, made of organic glass and has an inner diameter of 170 mm.
The CSTR reactor main material is organic glass, and effective volume is about 5L, and internal diameter 140mm, effective height-diameter ratio are about 2.3: 1, adopt the water mode of crossing of going into down going up and going out.
The domestication method of the Feammox functional sludge mainly comprises the operation process of a reaction device and the changing and adding process of the concentration of the iron ions in the inlet water;
the operation process of the reaction device is mainly divided into four main steps:
(1) selecting seed sludge: the inoculated sludge of the reactor is taken from anaerobic digested sludge treated by Fenton process in a sewage plant of a marine city. 1.5L-2L of sludge is inoculated into a reactor, and the hydraulic retention time is initially set to 8 h.
(2) Water inflow and aeration: firstly, placing the wastewater in a water inlet barrel, adding an iron ion solution, opening a nitrogen cylinder, adjusting a gas flow meter to control the nitrogen flow rate to be about 600L/h, leading a three-way ball valve to a gas washing cylinder, leading nitrogen into the water inlet barrel, removing dissolved oxygen in water, and discharging gas through the gas washing cylinder; after aerating for about 15min, measuring that the dissolved oxygen in the water reaches about 0.1mg/L, adjusting the pH value of the inlet water, then adjusting a three-way ball valve to lead the inlet water to an air collecting bag, and continuing aerating; when the gas collection bag is fully aerated, the aeration is stopped, and the three-way ball valve stays in the direction leading to the gas collection bag; the water inlet pump is closed before water distribution.
(3) The reaction mode is as follows: the continuous flow mode is adopted for operation, the water inlet pump is started to feed water, the water flows through the lower water inlet and the upper water outlet, and flows out of the upper water outlet ball valve and flows into the water outlet pool. In the reaction process, the liquid level in the water inlet bucket is reduced, and the nitrogen in the gas collection bag replenishes the space of the water inlet bucket and keeps the anaerobic condition for a long time; the stirring device is not closed after long-term operation.
(4) A temperature control mode: the temperature of the super constant temperature water bath is set at about 32 ℃, a submersible pump is arranged in the super constant temperature water bath, warm water enters a water bath interlayer from a lower ball valve from the super constant temperature water bath and then flows back by an upper ball valve, the temperature of an effective reaction area of the reactor is controlled by circulating flow, and the reactor is not closed after long-term operation.
The change of the concentration of the iron ions in the inlet water is mainly divided into five main stages:
(1) stage one: 1-15 days, NH in the inlet water4 +The concentration of N is controlled between 30 and 50mg/L, and the concentration of Fe (III) is controlled to be about 10 mg/L;
(2) and a second stage: controlling the concentration of Fe (III) in inlet water to be about 20mg/L and keeping the concentration of other elements unchanged within 16-26 days;
(3) and a third stage: controlling the concentration of Fe (III) in inlet water to be about 50mg/L and keeping the concentration of other elements unchanged within 27-31 days;
(4) and a fourth stage: controlling the concentration of Fe (III) in the inlet water to be about 70-80mg/L and keeping the concentration of other elements unchanged for 32-123 days;
(5) and a fifth stage: and the concentration of the Fe (III) of the inlet water is controlled to be about 40mg/L after 130 days, and the concentrations of other elements are unchanged.
Example 1
In the embodiment, the change of the trinitrogen content of the Feammox reactor is shown in FIG. 2, in the operation process of 130 days, the ammonia nitrogen removal rate can reach as high as 24.76%, and the ammonia nitrogen removal rate is as high as 0.057 kgN/(m) at most3D), the nitrite nitrogen content of the effluent at the later stage is almost 0mg/L, and the effluent products are mainly nitrate nitrogen and nitrogen, which shows that the process of the utility model successfully acclimates anaerobic digestion sludge into Feammox functional sludge.
The change of the iron ion content of the Feammox reactor in this example is shown in FIG. 3, with the different stages of the reactor operating, Fe in the fourth stage3+The ion concentration is increased to 70-80mg/L, and Fe in the system2+The ion concentration is also increasing, Fe2+The highest generated amount can reach 22mg/L, which indicates that the Fe added into the reactor3+Part of the iron is involved in the ammoxidation reaction of the iron and is converted into Fe2+The successful acclimation of the Feammox functional sludge in the reactor of the utility model is also illustrated.
Claims (5)
1. A preparation device for acclimatizing anaerobic digestion sludge into Feammox functional sludge is characterized in that: comprises a water inlet aeration unit, an activated sludge reaction unit and a temperature control unit;
the water inlet aeration unit consists of a nitrogen cylinder, a gas flowmeter, an aeration disc, a water inlet barrel, a gas collecting bag, a gas washing bottle and a water inlet pump;
the nitrogen cylinder is connected with the gas flowmeter, then enters the water inlet barrel through the small hole through the pneumatic PU pipe, and is connected with the aeration disc;
the air collecting bag and the air washing bottle are connected with the water inlet barrel through a three-way ball valve and are respectively arranged at two ends of the three-way ball valve;
one end of the water inlet pump is connected with the water inlet barrel, and the other end of the water inlet pump is connected with the activated sludge reaction unit.
2. The apparatus for producing sludge for acclimatization of anaerobically digested sludge into Feammox function sludge according to claim 1, wherein: the activated sludge reaction unit consists of a CSTR reactor, a three-phase separator, a speed regulator and a water outlet pool;
the CSTR reactor comprises a top cover, a bottom cover, a motor and a stirring paddle, and the main material is organic glass;
the top cover, the bottom cover and the motor are all connected by flanges, and the stirring paddle is connected to the lower end of the motor by a stainless steel coupler;
a water inlet and a sludge discharge port are arranged below the CSTR reactor, 3 sampling ports are arranged in the middle effective reaction area, a water outlet is arranged at the middle upper part, an exhaust port is arranged above the middle upper part, a check valve is arranged at the water inlet, and ball valves are arranged at the sludge discharge port, the sampling ports and the water outlet; the ball valve on the water outlet is connected with the PVC hose, and the outlet water flows into the water outlet pool through the PVC hose;
the motor drives the stirring paddle to stir the muddy water, and the speed regulator is connected with the motor and used for controlling the stirring speed;
the three-phase separator is bonded to the bottom of the CSTR cover.
3. The apparatus for producing sludge for acclimatization of anaerobically digested sludge into Feammox function sludge according to claim 2, wherein: the temperature control unit comprises a water bath interlayer and a super constant-temperature water bath;
the water bath interlayer wraps the outer side of an effective reaction area of the CSTR reactor, two ball valves are arranged at the upper part and the lower part and are connected with the super constant temperature water bath through PVC hoses, warm water enters the water bath interlayer from the lower ball valve from the super constant temperature water bath, then flows back through the upper ball valve, and the temperature is controlled through circulating flow.
4. The apparatus for producing sludge for acclimatization of anaerobically digested sludge into Feammox function sludge according to claim 2, wherein: the three-phase separator is cylindrical, is made of organic glass and has an inner diameter of 170 mm.
5. The apparatus for producing sludge for acclimatization of anaerobically digested sludge into Feammox function sludge according to claim 2, wherein: the CSTR reactor main material is organic glass, and effective volume is about 5L, and internal diameter 140mm, effective height-diameter ratio are about 2.3: 1, adopt the water mode of crossing of going into down going up and going out.
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