CN216890310U - Sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device - Google Patents
Sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device Download PDFInfo
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Abstract
The utility model belongs to the technical field of low C/N ratio sewage treatment, sludge treatment and recycling, and relates to a sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and recycling device which comprises a residual sludge storage tank, a chemical tank I, an anaerobic fermentation reactor, a chemical tank II, a sedimentation tank, a mixing tank, a recycling tank, a middle water tank and a nitrogen and phosphorus removal integrated reactor. The device can stably realize the deep denitrification and dephosphorization of the low C/N sewage, simultaneously realize the reutilization of organic resources of excess sludge and the recycling of ammonia nitrogen and phosphorus of inorganic resources, does not need to add an external carbon source, does not need to arrange a secondary sedimentation tank, has simple operation control, and realizes the low C/N sewage treatment with high efficiency and low consumption.
Description
Technical Field
The utility model belongs to the technical field of low C/N ratio sewage treatment, sludge treatment and recycling, and particularly relates to a sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and recycling device.
Background
The resource treatment of the excess sludge and the treatment of the high-nitrogen wastewater are very important for protecting the environment, particularly the phosphorus-containing low C/N ratio high-nitrogen industrial wastewater is difficult to denitrify, the traditional sludge treatment mode not only causes secondary pollution to the environment, meanwhile, the waste of resources caused by substances such as protein, polysaccharide, organic nitrogen, organic phosphorus and the like in the excess sludge, the removal of nitrogen and phosphorus can be realized only by adding a large amount of external carbon sources such as glucose, acetic acid and the like in the traditional treatment process of the low C/N sewage, the operation cost is increased, but also easily causes secondary environmental pollution, the anaerobic fermentation treatment of the sludge not only realizes the reutilization of the resources in the sludge as an external carbon source for the low C/N sewage, meanwhile, inorganic resources in the sludge can be recovered by a chemical method, so that the sludge is recycled, and the running cost of a sewage treatment plant due to the addition of an external carbon source is reduced.
At present, the sludge anaerobic fermentation mainly adopts NaOH type strong base fermentation, and has the characteristics of high organic matter extraction rate and good sludge reduction effect, but the method has low acetic acid content in the fermentation liquor, and has poor sludge-water separation effect, thereby being not beneficial to the application of the fermentation liquor in the later period.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device, which realizes the application of sludge anaerobic fermentation and integrated nitrogen and phosphorus removal equipment to the nitrogen and phosphorus removal of low C/N sewage and solves the problem of treatment and disposal of excess sludge.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a sludge fermentation enhanced low C/N sewage nitrogen and phosphorus removal and resource recovery device comprises a sludge anaerobic fermentation reactor, wherein an outlet of the anaerobic fermentation reactor is communicated with a sedimentation tank, an outlet of the sedimentation tank is communicated with an ammonia nitrogen and phosphate recovery system, an outlet of the ammonia nitrogen and phosphate recovery system is communicated with an intermediate water tank, an outlet of the intermediate water tank is communicated with an inlet at the bottom of the nitrogen and phosphorus removal integrated reactor, the nitrogen and phosphorus removal integrated reactor sequentially comprises an anaerobic sludge area, an anoxic suspension area, a first solid-liquid separation area, a nitrification and denitrification area and a second solid-liquid separation area from bottom to top, a steel wire mesh is arranged between the nitrification and denitrification area and the first solid-liquid separation area, a high-medium biological filler and an aeration component are filled in the nitrification and denitrification area, a first return pipe is arranged outside the anaerobic sludge area and the anoxic suspension area, and a first return pump is arranged on the first return pipe, the anoxic suspension region and the nitrification-denitrification regionThe bottom of the integrated reactor is refluxed through a second reflux pump, the anoxic suspension zone and the top of the nitrification and denitrification zone are refluxed through a third reflux pump, and the bottom of the integrated reactor for nitrogen and phosphorus removal is also provided with a raw water inlet3 -And N is an electron acceptor to absorb excessive phosphorus to realize nitrogen and phosphorus removal, and the arranged reflux pump is used for refluxing sludge in the anoxic zone to the anaerobic sludge zone so as to improve the sludge concentration and the strain abundance in the anaerobic sludge zone. The reflux pump is arranged to reflux the sludge in the anoxic sludge area to the nitrification and denitrification area so as to improve the microbial species in the nitrification and denitrification area and enrich the strain loaded on the biological membrane. The high-medium biological filler in the nitrification and denitrification zone is used as a reaction medium in the nitrification and denitrification zone, an aerobic environment and an anoxic environment can be formed, nitrification and denitrification reaction can be realized in the zone, short-range denitrification reaction can also be realized, COD and TN in water are further removed, and raw water refers to sewage with C/N < 4 to be treated, such as municipal sewage and the like.
Further, still include excess sludge and store up mud case and chemical tank I, be equipped with mud import and dosing mouth on the anaerobic fermentation reactor, excess sludge stores up in the mud case passes through the sludge pump and sends mud to the anaerobic fermentation reactor, and chemical tank I links to each other with the anaerobic fermentation reactor through the chemical pump, sets up agitator and pH/DO apparatus in the anaerobic fermentation reactor.
Further, ammonia nitrogen and phosphate recovery system includes the tank, the tank import is linked together with sedimentation tank zymotic fluid export, and the tank export is linked together through pump and recovery pond inlet, still includes chemical tank II, and chemical tank II is equipped with about two chemical tanks, and left side chemical tank is MgCl2∙6H2O medicament, the right medicament pool is Na2HPO4∙6H2O medicament, and MgCl is also arranged on the recovery tank2∙6H2O agent import and Na2HPO4∙6H2An O medicament inlet and a recovery tank outlet are communicated with the middle water tank.
Furthermore, be equipped with the funnel-shaped separator of inverting in first solid-liquid separation district and the second solid-liquid separation district, funnel-shaped separator includes cone funnel portion and the pipe portion of giving vent to anger, and the pipe portion length of giving vent to anger of first solid-liquid separation district is less than the pipe portion of giving vent to anger of second solid-liquid separation district, still overlaps on the pipe portion of giving vent to anger of second solid-liquid separation district to be equipped with net heavy pipe, and anaerobism mud district bottom still is equipped with surplus sludge outlet.
The device for performing nitrogen and phosphorus removal and resource recovery by utilizing the sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device comprises the following operation steps:
1) starting a sludge anaerobic fermentation system: adding the residual sludge into a sludge storage pool, wherein the sludge concentration MLSS is 10000-15000 mg/L; 1mol/L of Ca (OH)2Adding the solution into a chemical box I, pumping the solution into an anaerobic fermentation reactor through a sludge pump and a chemical pump, starting a stirrer at the same time, controlling the pH to be 9-9.5, and pumping a mud-water mixture into a sedimentation tank through a sludge pump for mud-water separation;
2) starting an ammonia nitrogen and phosphate recovery system: the supernatant of the sedimentation tank is pumped to a water storage tank through a sewage pump, the sewage pump is started to convey the fermentation liquid to a recovery tank, and a stirring paddle and a medicament pump are started to convey MgCl2∙6H2O and Na2HPO4∙6H2O is sent to a recovery tank for nitrogen and phosphorus recovery, supernatant fluid is discharged, and precipitation is recovered;
3) starting the denitrification and dephosphorization integrated reactor: starting a sewage pump to deliver fermentation liquor and raw water to an anaerobic sludge area according to a ratio, wherein the sludge concentration MLSS of the anaerobic sludge area is 6000mg/L, sewage enters an anoxic sludge area, the sludge concentration of the anoxic sludge area is 3000 mg/L, the sludge pump is started to deliver sludge of the anoxic sludge area to the anaerobic sludge area, sludge-water mixture of the anoxic sludge area is subjected to first sludge-water separation in a first solid-liquid separation area, separated liquid enters a nitrification-denitrification area, a reflux pump reflows mixed liquid of the nitrification-denitrification area to the anoxic sludge area, sludge enters a second solid-liquid separation area to be subjected to second sludge-water separation, sludge is subjected to third sludge-water separation in a clear settling pipe, gas in water is discharged, and sludge and a biological membrane are settled to the nitrification-denitrification area;
4) and (3) operation control:
(1) the excess sludge in the sludge storage box enters an anaerobic fermentation reactor through a sludge pump, and Ca (OH) in a chemical box I2Pumping the mixture into an anaerobic fermentation reactor by a medicament pump, starting a stirrer, controlling the pH value in the reactor to be 9-9.5 and the sludge age to be 7 days, and selecting Ca (OH)2As a sludge treatment agent, Ca (OH)2The alkalescent fermentation can optimize the acid production type of the sludge, improve the proportion of acetic acid in the fermentation liquor, increase the particle size of the sludge and promote the separation of sludge and water, adopts the control within the range of pH =9-9.5, can extract the organic matters in the sludge to the maximum extent, is beneficial to the subsequent recovery of ammonia nitrogen and phosphate by the weak-base fermentation liquor, and does not need to regulate the pH again;
(2) carrying out sludge-water separation on the sludge-water mixture discharged by the anaerobic fermentation reactor in a sedimentation tank, pumping the sludge-water mixture to a water storage tank, delivering the fermentation liquor to a recovery tank through a sewage pump, and simultaneously pumping MgCl through a medicament pump2∙6H2O and Na2HPO4∙6H2O is as Mg2+：NH4+：PO4 3-The addition is carried out in a ratio of 1:1:1, and MgCl is selected in the utility model2∙6H2O and Na2HPO4∙6H2O and NH in fermentation liquor4+-N and PO4 3-P reaction to MgNH4PO4∙6H2O to NH4+-N and PO4 3-P is recycled, so that the increase of the running load of a subsequent reactor when the fermentation liquor is used as an external carbon source is avoided;
(3) and (3) storing the fermentation liquor after nitrogen and phosphorus removal in an intermediate water tank, starting a sewage pump to convey the fermentation liquor and the low C/N sewage to the nitrogen and phosphorus removal integrated reactor, wherein the fermentation liquor is: raw water enters the denitrification and dephosphorization integrated reactor according to the flow rate of 1:20-1:50, the anaerobic sludge zone reacts for 30-60min, sewage enters the anoxic sludge zone to react for 60-120min, the sewage after solid-liquid separation enters the nitrification and denitrification zone to react for 120-240min, sludge in the anoxic sludge zone is refluxed to the anaerobic sludge zone according to the reflux ratio of 200 percent in 100-fold, liquid in the nitrification and denitrification zone is refluxed to the anoxic sludge zone according to the reflux ratio of 300 percent in 200-fold by starting the reflux pump, and the sludge is refluxed to the nitrification and denitrification zone according to 20-30 percent by starting the reflux pump.
The process principle of the utility model is as follows: the excess sludge is firstly fermented to produce acid in a sludge fermentation device, and is separated from mud and water and then is mixed with MgCl2∙6H2O and Na2HPO4∙6H2Mixing O together in a recovery tank to form MgNH4PO4∙6H2O, performing sludge-water separation to realize efficient recovery of ammonia nitrogen and phosphate, purifying fermentation liquor, enabling supernatant to automatically flow into an intermediate water tank, enabling the supernatant to simultaneously enter nitrogen and phosphorus removal integrated equipment with raw water, converting an external carbon source into an internal carbon source in a reaction zone by denitrifying phosphorus removal bacteria and performing phosphorus release, and enabling the denitrifying phosphorus removal bacteria to utilize NO in a mixed solution of nitrification and denitrification backflow in an anoxic suspension zone3 -And (4) denitrifying and dephosphorizing by using the N to achieve the aim of denitrifying and dephosphorizing, and then introducing the sewage into a nitrification and denitrification area to carry out nitrification treatment and partial denitrification treatment to further remove TN in the water. The device can stably realize the deep nitrogen and phosphorus removal of the low C/N sewage, simultaneously realize the reutilization of the organic resources of the excess sludge and the recycling of ammonia nitrogen and phosphate, does not need to add an external carbon source in the nitrogen and phosphorus removal process, saves the aeration rate, has simple operation control, and realizes the high-nitrogen wastewater treatment with high efficiency and low consumption.
The utility model has the advantages that:
1. the utility model adopts an integrated nitrogen and phosphorus removal reactor, an anaerobic zone, an anoxic zone and an aerobic zone are formed in the integrated reactor by controlling hydraulic retention time, sludge reflux and mixed liquor reflux of a nitrification and denitrification zone, a granular sludge bed is formed in the anaerobic zone, denitrifying phosphorus removal bacteria utilize an external carbon source to carry out phosphorus release reaction, the sludge concentration in the anoxic zone is lower and is in a suspension state, and the denitrifying phosphorus removal bacteria in the anoxic sludge zone utilize NO in the mixed liquor of the nitrification and denitrification zone which is refluxed3 -N is an electron acceptor to absorb excessive phosphorus to realize nitrogen and phosphorus removal, and a reflux pump is arranged to reflux sludge in an anoxic zone to an anaerobic sludge zoneThe sludge concentration and the strain abundance in the anaerobic sludge area are improved. The reflux pump is arranged to reflux the sludge in the anoxic sludge area to the nitrification and denitrification area so as to improve the microbial species in the nitrification and denitrification area and enrich the strain loaded on the biological membrane. The high-medium biological filler in the nitrification and denitrification zone is used as a reaction medium in the nitrification and denitrification zone pool and can form an aerobic environment and an anoxic environment, nitrification and denitrification can be realized in the zone, short-range denitrification can also be realized, and COD and TN in water are further removed;
2. the utility model carries out the slightly alkaline fermentation of the excess sludge, not only can realize the sludge reduction and reduce the sludge yield, but also can carry out the high-efficiency conversion of organic matters, and simultaneously can easily separate sludge and water to carry out NH in the sludge fermentation liquor4+-N and PO4 3-P is efficiently recycled, the sludge recycling effect is improved, and carbon source contention of phosphorus microorganisms in the subsequent nitrogen and phosphorus removal process is reduced;
3. the utility model respectively locates the nitrifying bacteria and the denitrifying phosphorus removal bacteria with great difference in growth environment requirements in different sludge systems, thus being beneficial to the coordination and the high-efficiency operation of each system;
4. the high-efficiency biological medium filler adopted by the utility model contains an anoxic zone inside, and can further remove NO in water3 -N, improving the denitrification effect, arranging high-medium biological filler in the nitrification and denitrification region, carrying out nitrification and denitrification reactions in a biological membrane mode, and realizing sludge-water separation through solid-liquid separation without arranging a sedimentation tank, thereby saving investment.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
As shown in figure 1, the sludge fermentation enhanced low C/N sewage nitrogen and phosphorus removal and resource recovery device comprises a sludge anaerobic fermentation reactor 1, wherein an outlet of the anaerobic fermentation reactor 1 is communicated with a sedimentation tank 4, an outlet of the sedimentation tank 4 is communicated with an ammonia nitrogen and phosphate recovery system, an outlet of the ammonia nitrogen and phosphate recovery system is communicated with an intermediate water tank 8, and an outlet of the intermediate water tank 8 is communicated with an inlet at the bottom of a nitrogen and phosphorus removal integrated reactor;
sludge anaerobismThe fermentation reactor 1 is a closed box body provided with a stirrer 1-1 and a pH/DO tester 1-2, the sludge storage box 2 and the chemical box I3 are non-sealed box bodies, and 1mol/L Ca (OH) is arranged in the chemical box I32The residual sludge in the solution, the sedimentation tank 4 and the sludge storage tank 2 enters the anaerobic fermentation reactor 1 through a sludge pump 2-1 according to the sludge feeding requirement, simultaneously, a stirrer 1-1 and a medicament pump I1-2 are started, and Ca (OH) is added2Sending the mixture into an anaerobic fermentation reactor, and controlling the pH value in the reactor on line through the pH/DO; discharging the fermented sludge in the anaerobic fermentation reactor to a sedimentation tank 4 for water inlet mud-water separation;
the ammonia nitrogen and phosphate recovery system comprises: MgCl in kit II 62∙6H2O (left) and Na2HPO4∙6H2O (right) solution, a recovery tank 7 and a stirring paddle 7-1, wherein fermentation liquor in the water storage tank 5 is sent into the recovery tank 7 through a sewage pump, and meanwhile, a medicament pump is started to enable MgCl in a medicament box II 62∙6H2O (left) and Na2HPO4∙6H2And (4) conveying the O into a recovery tank 7 according to a certain proportion, and starting a stirring paddle 7-1 to improve the reaction speed.
5 areas are arranged in the denitrification and dephosphorization integrated reactor 9, namely an anaerobic sludge area 9-1, an anoxic suspension area 9-2, a first solid-liquid separation area 9-3, a nitrification and denitrification area 9-4 and a second solid-liquid separation area 9-5, and the device also comprises a net sedimentation pipe 9-6, an aeration component 9-7, a first reflux pump 9-10, a second reflux pump 9-9 and a third reflux pump 9-8, wherein fermentation liquor with recovered nitrogen and phosphorus is stored in an intermediate water tank 8, the fermentation liquor is delivered to the anaerobic sludge area 9-1 through a sewage pump 8-1, raw water is delivered to the anaerobic sludge area 9-1 through the pump, enters the anoxic suspension area 9-2 along with the propulsion of water flow, then enters the nitrification and denitrification area 9-4 after passing through the first solid-liquid separation area 9-3, and then the sludge first reflux pump 9-10 is started to enable sludge in the anoxic area 9-2 to flow back to the anaerobic area 9-1. And (3) starting an aeration component 9-7 to control DO concentration in the aeration zone, enabling the sewage to enter a second solid-liquid separation zone 9-5 for solid-liquid separation after passing through the nitrification and denitrification zone, starting a third reflux pump 9-8 to enable mixed liquid in the nitrification and denitrification zone to reflux to an anoxic sludge zone 9-2, discharging treated effluent, discharging gas through a gas guide pipe, separating residual sludge and biomembranes in water in a net sedimentation pipe 9-6, and returning to the nitrification and denitrification zone.
To sum up, the provided sludge fermentation reinforced low C/N sewage nitrogen and phosphorus removal and resource recovery device comprises the following processes: the excess sludge is firstly fermented and acidogenic treated in a sludge fermentation device, and is separated from the sludge and the MgCl2∙6H2O and Na2HPO4∙6H2Mixing O together in a recovery tank to form MgNH4PO4∙6H2O, performing sludge-water separation to realize efficient recovery of ammonia nitrogen and phosphate, purifying fermentation liquor, enabling supernatant to automatically flow into an intermediate water tank, enabling the supernatant to simultaneously enter nitrogen and phosphorus removal integrated equipment with raw water, converting an external carbon source into an internal carbon source in a reaction zone by denitrifying phosphorus removal bacteria and performing phosphorus release, and enabling the denitrifying phosphorus removal bacteria to utilize NO in a mixed solution of nitrification and denitrification backflow in an anoxic suspension zone3 -And carrying out denitrification dephosphorization by N to achieve the aim of denitrification dephosphorization. Then the sewage enters a nitrification and denitrification area for nitrification and partial denitrification, and TN in the water is further removed. The device can stably realize the deep nitrogen and phosphorus removal of the low C/N sewage, simultaneously realize the reutilization of the organic resources of the excess sludge and the recycling of ammonia nitrogen and phosphate, does not need to add an external carbon source in the nitrogen and phosphorus removal process, saves the aeration rate, has simple operation control, and realizes the high-nitrogen wastewater treatment with high efficiency and low consumption.
Claims (3)
1. The utility model provides a sludge fermentation reinforces low C/N sewage nitrogen and phosphorus removal and resource recovery unit which characterized in that: the anaerobic fermentation reactor comprises a sludge anaerobic fermentation reactor, wherein an outlet of the anaerobic fermentation reactor is communicated with a sedimentation tank, an outlet of the sedimentation tank is communicated with an ammonia nitrogen and phosphate recovery system, an outlet of the ammonia nitrogen and phosphate recovery system is communicated with an intermediate water tank, an outlet of the intermediate water tank is communicated with an inlet at the bottom of the denitrification and dephosphorization integrated reactor, the denitrification and dephosphorization integrated reactor sequentially comprises an anaerobic sludge zone, an anoxic suspension zone, a first solid-liquid separation zone, a nitrification and denitrification zone and a second solid-liquid separation zone from bottom to top, a steel wire mesh is arranged between the nitrification and denitrification zone and the first solid-liquid separation zone, high-medium biological filler and an aeration component are filled in the nitrification and denitrification zone, a first reflux pump is arranged outside the anaerobic sludge zone and the anoxic suspension zone, the anoxic suspension zone and the nitrification and denitrification zone are refluxed by a second reflux pump, and the anoxic suspension zone and the denitrification zone are refluxed by a third reflux pump, the bottom of the denitrification and dephosphorization integrated reactor is also provided with a raw water inlet.
2. The sludge fermentation enhanced low C/N sewage nitrogen and phosphorus removal and resource recovery device of claim 1, which is characterized in that: the anaerobic fermentation reactor is characterized by further comprising an excess sludge storage tank and a chemical tank I, wherein a sludge inlet and a chemical adding port are formed in the anaerobic fermentation reactor, the excess sludge storage tank conveys sludge into the anaerobic fermentation reactor through a sludge pump, the chemical tank I is connected with the anaerobic fermentation reactor through a chemical pump, and a stirrer and a pH/DO tester are arranged in the anaerobic fermentation reactor.
3. The sludge fermentation enhanced low C/N sewage nitrogen and phosphorus removal and resource recovery device of claim 2, which is characterized in that: ammonia nitrogen and phosphate recovery system includes the tank, the tank import is linked together with sedimentation tank zymotic fluid export, and the tank export is linked together through pump and recovery pond inlet, still includes chemical tank II, and two chemical tanks about chemical tank II is equipped with, and left side chemical tank is MgCl2∙6H2O medicament, the right medicament pool is Na2HPO4∙6H2O medicament, and MgCl is also arranged on the recovery tank2∙6H2O agent import and Na2HPO4∙6H2An O medicament inlet and a recovery tank outlet are communicated with the middle water tank.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893644A (en) * | 2022-11-05 | 2023-04-04 | 北京工业大学 | Device and method for strengthening sewage nitrogen and phosphorus removal by combining SRT (reduced surface temperature) and HRT (high resolution transformation) with denitrification phosphorus removal coupled anaerobic ammonia oxidation |
| CN116621339A (en) * | 2023-07-26 | 2023-08-22 | 湖南三友环保科技有限公司 | Fine control denitrification control method and control device for sewage processor |
| CN115893644B (en) * | 2022-11-05 | 2024-04-19 | 北京工业大学 | Device and method for constructing denitrification dephosphorization coupled anaerobic ammonia oxidation enhanced sewage denitrification dephosphorization by SRT and HRT combined regulation and control |
-
2021
- 2021-12-28 CN CN202123326911.8U patent/CN216890310U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893644A (en) * | 2022-11-05 | 2023-04-04 | 北京工业大学 | Device and method for strengthening sewage nitrogen and phosphorus removal by combining SRT (reduced surface temperature) and HRT (high resolution transformation) with denitrification phosphorus removal coupled anaerobic ammonia oxidation |
| CN115893644B (en) * | 2022-11-05 | 2024-04-19 | 北京工业大学 | Device and method for constructing denitrification dephosphorization coupled anaerobic ammonia oxidation enhanced sewage denitrification dephosphorization by SRT and HRT combined regulation and control |
| CN116621339A (en) * | 2023-07-26 | 2023-08-22 | 湖南三友环保科技有限公司 | Fine control denitrification control method and control device for sewage processor |
| CN116621339B (en) * | 2023-07-26 | 2023-12-01 | 湖南三友环保科技有限公司 | Fine control denitrification control method and control device for sewage processor |
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