CN112850894B - Device and method for advanced denitrification of industrial wastewater through anaerobic ammonia oxidation - Google Patents
Device and method for advanced denitrification of industrial wastewater through anaerobic ammonia oxidation Download PDFInfo
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Abstract
The invention provides a device and a method for advanced denitrification of anaerobic ammonia oxidation of industrial wastewater, and relates to the technical field of sewage treatment. The device provided by the invention comprises a preposed inhibition area, an anaerobic ammonia oxidation system and O1AO2A denitrification area and a single sludge sedimentation tank system; the preposed inhibition area is provided with a first aeration system, an alkali adding system, an online pH determinator and an online ammonia nitrogen determinator; the anaerobic ammonia oxidation system is provided with a second aeration system and an immobilized filler layer; said O is1AO2The denitrification area comprises a first aeration area, an anoxic area and a second aeration area which are sequentially communicated in series; the single sludge sedimentation tank system comprises a sedimentation tank, a sludge outlet arranged at the bottom of the sedimentation tank and a water outlet arranged at the upper part of the sedimentation tank. The device provided by the invention is a single sludge sedimentation system, and can ensure the stability of the system while reducing the process complexity and the operation cost. The device provided by the invention is used for carrying out anaerobic ammonia oxidation deep denitrification on industrial wastewater, and the total nitrogen removal rate is more than 97%.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a device and a method for advanced denitrification of anaerobic ammonia oxidation of industrial wastewater.
Background
The anaerobic ammonia oxidation process utilizes NO2 -Oxidation of NH by N (nitrous nitrogen)4 +-N (Ammonia Nitrogen) to form N2And NO3 -N (nitrate nitrogen) is the most economic biological denitrification process at present, can save aeration energy consumption by 62.5 percent, does not need additional carbon source for removing TN (total nitrogen), reduces the discharge amount of greenhouse gases, and belongs to a novel energy-saving clean production technology of high ammonia nitrogen wastewater. However, the anammox denitrification process theoretically produces part of NO3 -And N, the theoretical denitrification efficiency is 88.7%, the actual engineering is lower than 80%, and in order to meet the discharge standard, a deep denitrification unit is required to be added after the anaerobic ammonia is oxidized to produce water, so that TN (ammonia nitrogen, nitrite nitrogen and nitrate nitrogen) is further removed. The existing treatment process is generally shown in figure 1, a deep denitrification unit 3 and an anaerobic ammonia oxidation unit 1 are required to be a double-sludge system (sedimentation tanks, namely a sedimentation tank 2 and a sedimentation tank 4, are required to be respectively arranged on the deep denitrification unit after anaerobic ammonia oxidation), sludge of the anaerobic ammonia oxidation system is short-cut nitrification sludge and anaerobic ammonia oxidation bacteria, anaerobic ammonia oxidation effluent enters a post-positioned deep denitrification system, and sludge in the deep denitrification system is traditional nitrification denitrificationSludge (the deep denitrification system is divided into a nitrification area 3.1 and a denitrification area 3.2, namely an AO system). Just because the anaerobic ammonia oxidation system needs to maintain the shortcut nitrification and the anaerobic ammonia oxidation, the sludge is a shortcut nitrification and anaerobic ammonia oxidation strain; the deep denitrification system is the traditional nitrification and denitrification system, and the sludge is the traditional activated sludge, so the deep denitrification unit 3 and the anaerobic ammonia oxidation unit 1 are required to be a double-sludge system, and the sludge and the strains are respectively retained in respective reaction systems.
The arrangement of the double-sludge system needs two sets of sedimentation tanks, sludge reflux pumps, matched pipelines, valves and control systems, increases the process complexity, increases the investment and the operation cost, and reduces the technical advantages of the process in practical application.
Disclosure of Invention
In view of the above, the present invention aims to provide an apparatus and a method for advanced denitrification of anaerobic ammonia oxidation of industrial wastewater, wherein the apparatus provided by the present invention is a single sludge precipitation system, and can ensure the stability of the system while reducing the process complexity and the operation cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a device for advanced denitrification of anaerobic ammonia oxidation of industrial wastewater, which comprises:
the device comprises a preposed inhibition zone 1, wherein the preposed inhibition zone 1 comprises a water inlet end 1.5 and a water outlet end 1.6, a first aeration system 1.1 is arranged at the bottom in the preposed inhibition zone 1, and the preposed inhibition zone 1 is communicated with an alkali adding system 1.2; the preposed inhibition area 1 is also provided with an online pH determinator 1.3 and an online ammonia nitrogen determinator 1.4, and the online pH determinator 1.3 is simultaneously connected with the alkali adding system 1.2 through a signal line;
the anaerobic ammonia oxidation system 2 is characterized in that a water inlet end of the anaerobic ammonia oxidation system 2 is communicated with a water outlet end 1.6 of the preposed inhibition area 1, a second aeration system 2.1 and an immobilized filler layer 2.2 are sequentially arranged in the anaerobic ammonia oxidation system 2 from bottom to top, and anaerobic ammonia oxidizing bacteria are attached to the immobilized filler layer 2.2;
o with water inlet end communicated with water outlet end of anaerobic ammonia oxidation system 21AO2Denitrification zone 3, said O1AO2The denitrification area 3 comprises a first aeration area 3.1, an anoxic area 3.2 and a second aeration area 3.3 which are sequentially communicated in series; the first aeration zone 3.1 is communicated with the water outlet end of the anaerobic ammonia oxidation system 2, and the bottom parts in the first aeration zone 3.1 and the second aeration zone 3.3 are respectively provided with a third aeration system 3.4 and a fourth aeration system 3.6; the anoxic zone 3.2 is communicated with a carbon source adding system 3.7; the second aeration area 3.3 is provided with a water outlet;
the water inlet and the single sludge sedimentation tank system 4 of the delivery port intercommunication of aeration two district 3.3, single sludge sedimentation tank system 4 includes sedimentation tank 4.1, sets up sludge outlet 4.2 and the delivery port 4.3 on upper portion in sedimentation tank 4.1 bottom, sludge outlet 4.2 branch is mud backward flow mouth and mud discharge port, mud backward flow mouth and leading suppression district 1 intake end intercommunication.
Preferably, an agitator 3.5 is also arranged in the anoxic zone 3.2.
Preferably, the immobilized filler layer 2.2 is a polyurethane filler and/or a polypropylene filler; the filling amount of the immobilized filler layer 2.2 is 40-60% of the effective volume of the anaerobic ammonia oxidation system 2.
Preferably, the second aeration zone 3.3 is further provided with a water outlet backflow port, and the water outlet backflow port is communicated with the water inlet end of the preposed inhibition zone 1; and a reflux pump 6 is arranged on a connecting pipeline of the water outlet reflux port and the preposed inhibition area 1, and the reflux pump 6 is connected with an online ammonia nitrogen determinator 1.4 through a signal line.
Preferably, the pipelines of the sludge return port and the sludge discharge port are respectively provided with a sludge return pump 7 and a sludge discharge pump 8; the sludge reflux pump 7 is connected with the on-line ammonia nitrogen determinator 1.4 through a signal line.
The invention provides a method for deep denitrification of anaerobic ammonia oxidation of industrial wastewater, which comprises the following steps:
(1) the method comprises the steps that industrial wastewater to be treated enters a pre-inhibition area 1, the industrial wastewater is mixed with return sludge which flows back to the pre-inhibition area 1 from a sedimentation tank 4.1 through a sludge return port under the action of a first aeration system 1.1, alkaline substances are added through an alkali adding system 1.2 to adjust the pH value in the pre-inhibition area 1 to be 7.5-8.2, the flow of the return sludge adjusts the ammonia nitrogen concentration in the pre-inhibition area 1 to be 200-500 mg/L, and the pH value and the ammonia nitrogen concentration are monitored by an online pH meter 1.3 and an online ammonia nitrogen meter 1.4 in real time respectively;
(2) the wastewater treated by the preposed inhibition area 1 enters an anaerobic ammonia oxidation system 2, and NH in the wastewater is treated by ammonia oxidizing bacteria under the action of a second aeration system 2.14 +Conversion of-N to NO2 -N, NH utilization by anaerobic ammonium oxidizing bacteria attached to the immobilized packing layer 2.24 +-N and NO2 -Nitrogen and NO after N reaction3 --N；
(3) The wastewater treated by the anaerobic ammonia oxidation system 2 enters O1AO2The denitrification area 3 is used for removing the residual NH in the anaerobic ammonia oxidation system 2 under the action of a third aeration system 3.4 in the first aeration area 3.14 +Nitration of-N to NO2 --N；
The wastewater treated and flowing out of the aeration first zone 3.1 enters an anoxic zone 3.2, an organic carbon source is added into the anoxic zone 3.2 through a carbon source adding system 3.7, and NO is added2 --N and NO3 --denitrification of N to nitrogen;
the treated wastewater flowing out of the anoxic zone 3.2 enters an aeration second zone 3.3, and the residual organic carbon source in the anoxic zone 3.2 is removed under the action of a fourth aeration system 3.6;
(4) the wastewater treated by the second aeration zone 3.3 enters a single sludge sedimentation tank system 4, sludge-water separation is carried out in a sedimentation tank 4.1, the separated sludge part reflows to the preposed inhibition zone 1, the rest is discharged from a sludge discharge port, and the separated supernatant is discharged from a water outlet 4.3.
Preferably, the wastewater treated by the second aeration zone 3.3 also flows back to the prepositive suppression zone 1 through a water outlet return opening part.
Preferably, the hydraulic retention time of the preposed inhibition zone 1 in the step (1) is 30-60 min; the temperature in the pre-inhibition zone 1 is 28-32 ℃.
Preferably, the dissolved oxygen in the anammox system 2 in step (2) is 0.5mg/L or less.
Preferably, the ammonia nitrogen concentration in the aeration zone 3.1 in the step (3) is less than or equal to 5 mg/L; the organic carbon source added in the anoxic zone 3.2 comprises sodium acetate and/or methanol; the dissolved oxygen in the second aeration zone 3.3 is less than or equal to 2.0 mg/L.
The invention provides a device for deep denitrification of anaerobic ammonia oxidation of industrial wastewater, which comprises a preposed inhibition area 1, an anaerobic ammonia oxidation system 2 and O1AO2A denitrification area 3 and a single sludge sedimentation tank system 4; the preposed inhibition area 1 is provided with a first aeration system 1.1, an alkali adding system 1.2, an online pH determinator 1.3 and an online ammonia nitrogen determinator 1.4; the anaerobic ammonia oxidation system 2 is provided with a second aeration system 2.1 and an immobilized filler layer 2.2; said O is1AO2The denitrification area 3 comprises a first aeration area 3.1, an anoxic area 3.2 and a second aeration area 3.3 which are sequentially communicated in series; the single sludge sedimentation tank system 4 comprises a sedimentation tank 4.1, a sludge outlet 4.2 arranged at the bottom of the sedimentation tank 4.1 and a water outlet 4.3 arranged at the upper part. The invention has the following beneficial effects:
short-cut nitrification of single sludge system is difficult to control (NH)4 +-N is difficult to convert stably to NO2 -N), so the conventional systems are all double sludge systems; the front end of the anaerobic ammonia oxidation system is provided with the preposed inhibition area, microorganisms are inhibited and elutriated by coupling ammonia nitrogen in inlet water with pH value regulation, non-denitrification functional bacteria are inhibited, the proliferation of ammonia oxidizing bacteria is maintained, the strains are continuously purified, the stable short-cut nitrification effect of the anaerobic ammonia oxidation system is realized, the system stability is effectively improved, the anaerobic ammonia oxidation system does not need to be provided with a sludge precipitation system, and only O is used1AO2The denitrification area is provided with 1 set of precipitation system, so that the effect of deep denitrification can be realized. Compared with the traditional double-sludge system, the device provided by the invention can save a sedimentation tank, a sludge backflow, sludge discharge and water distribution system matched with the sedimentation tank, a matched water pump, a pipeline, a control system, an instrument and other equipment.
In addition, the traditional double-sludge system, deep denitrification, relies on the traditional nitrification and denitrification for denitrification, generally an AO system, and the nitrification process of the system is NH4 +Conversion of-N to NO3 -N, denitrification of NO3 --N is reduced to nitrogen; setting O in the invention1AO2A denitrification area, which is a short-cut nitrification denitrification process for removing NH4 +Conversion of-N to NO2 -N, denitrification of NO2 -And N is reduced into nitrogen, and compared with the traditional nitrification and denitrification process, the method can save 25% of aeration energy consumption and 40% of carbon source.
The invention also provides a method for deep denitrification of the industrial wastewater by anaerobic ammonia oxidation, the deep denitrification and anaerobic ammonia oxidation are carried out on the industrial wastewater by adopting the device provided by the invention, the removal rate of Total Nitrogen (TN) is more than 97%, and most of industrial wastewater can meet the discharge standard after being treated by the device.
Drawings
FIG. 1 is a schematic diagram of a conventional deep denitrification anammox apparatus; in FIG. 1, 1 is an anaerobic ammonia oxidation system, 2 is a sedimentation tank, 3 is a deep denitrification unit, 3.1 is a nitrification zone, 3.2 is a denitrification zone, and 4 is a sedimentation tank;
FIG. 2 is a schematic view of the deep denitrification anaerobic ammonium oxidation apparatus provided by the invention, wherein in FIG. 2, 1-a preposed inhibition area, 1.1-a first aeration system, 1.2-an alkali adding system, 1.3-an online pH meter, 1.4-an online ammonia nitrogen meter, 1.5-a water inlet end of the preposed inhibition area, and 1.6-a water outlet end of the preposed inhibition area; 2-anaerobic ammonia oxidation system, 2.1-second aeration system, 2.2-immobilized filler layer and 3-O1AO2The system comprises a denitrification area, a first aeration area, a second aeration area, a third aeration system, a stirrer, a fourth aeration system, a carbon source adding system, a 4-single sludge sedimentation tank system, a 4.1-sedimentation tank, a 4.2-sludge outlet, a 4.3-water outlet, a 5-water inlet pump, a 6-reflux pump, a 7-sludge reflux pump and an 8-sludge discharge pump, wherein the first aeration area is 3.1, the second anoxic area is 3.2, the third aeration system is 3.4, the stirrer is 3.5, the fourth aeration system is 3.7, the carbon source adding system is 3.7, the single sludge sedimentation tank system is 4.1, the sedimentation tank is 4.2, the sludge outlet is 4.3, the water outlet is 5, the water inlet pump is 6, the reflux pump is 7, and the sludge reflux pump is 8.
Detailed Description
The invention provides a device for advanced denitrification of anaerobic ammonia oxidation of industrial wastewater, which comprises:
the device comprises a preposed inhibition zone 1, wherein the preposed inhibition zone 1 comprises a water inlet end 1.5 and a water outlet end 1.6, a first aeration system 1.1 is arranged at the bottom in the preposed inhibition zone 1, and the preposed inhibition zone 1 is communicated with an alkali adding system 1.2; the pre-inhibition zone 1 is also provided with an online pH tester 1.3 and an online ammonia nitrogen tester 1.4, and the online pH tester 1.3 is simultaneously connected with the alkali adding system 1.2 through a signal line;
the anaerobic ammonia oxidation system 2 is characterized in that a water inlet end of the anaerobic ammonia oxidation system 2 is communicated with a water outlet end 1.6 of the preposed inhibition area 1, a second aeration system 2.1 and an immobilized filler layer 2.2 are sequentially arranged in the anaerobic ammonia oxidation system 2 from bottom to top, and anaerobic ammonia oxidizing bacteria are attached to the immobilized filler layer 2.2;
o with water inlet end communicated with water outlet end of anaerobic ammonia oxidation system 21AO2Denitrification zone 3, said O1AO2The denitrification area 3 comprises a first aeration area 3.1, an anoxic area 3.2 and a second aeration area 3.3 which are sequentially communicated in series; the first aeration zone 3.1 is communicated with the water outlet end of the anaerobic ammonia oxidation system 2, and the bottom parts in the first aeration zone 3.1 and the second aeration zone 3.3 are respectively provided with a third aeration system 3.4 and a fourth aeration system 3.6; the anoxic zone 3.2 is communicated with a carbon source adding system 3.7; the second aeration area 3.3 is provided with a water outlet;
the water inlet and the single sludge sedimentation tank system 4 that the delivery port of the second district 3.3 of aeration is connected, single sludge sedimentation tank system 4 includes sedimentation tank 4.1, sets up sludge outlet 4.2 and the delivery port 4.3 on upper portion in sedimentation tank 4.1 bottom, sludge outlet 4.2 branch is mud backward flow mouth and mud discharge port, mud backward flow mouth and leading suppression zone 1's the end intercommunication of intaking.
The device for the anaerobic ammonia oxidation and deep denitrification of the industrial wastewater provided by the invention is shown in figure 2.
The device for the advanced denitrification of the anaerobic ammonia oxidation of the industrial wastewater comprises a preposed inhibition area 1; the pre-inhibition zone 1 comprises a water inlet end 1.5 and a water outlet end 1.6, and the pre-inhibition zone 1 is provided with a first aeration system 1.1, an alkali adding system 1.2, an online pH determinator 1.3 and an online ammonia nitrogen determinator 1.4. In the present invention, the water inlet end of the pre-suppression zone 1 is preferably provided with a water inlet pump 5, and the water inlet pump 5 is not particularly required in the present invention, and a water inlet pump well known to those skilled in the art can be adopted. In the present invention, the first aeration system 1.1 is disposed at the bottom of the pre-suppression zone 1, and the aeration system known to those skilled in the art may be used without particular limitation to the first aeration system 1.1. In the present invention, the alkali adding system 1.2 is preferably arranged above the pre-suppression zone 1, and the outlet of the alkali adding system 1.2 is connected into the pre-suppression zone 1; the invention has no special requirements on the structure of the alkali adding system 1.2, and can realize the addition of alkali. In the invention, the preposed inhibition zone 1 is also provided with an online pH determinator 1.3 and an online ammonia nitrogen determinator 1.4, the online pH determinator 1.3 and the online ammonia nitrogen determinator 1.4 have no special requirements, and the pH determinator and the ammonia nitrogen determinator which are well known by the technicians in the field can be adopted; the online pH tester 1.3 is simultaneously connected with the alkali adding system 1.2 through a signal line, the alkali adding amount of the alkali adding system 1.2 is adjusted in real time through the monitoring data of the online pH tester 1.3, and the pH value is controlled within a set range; and the on-line ammonia nitrogen determinator 1.4 monitors the ammonia nitrogen concentration in the preposed inhibition area 1 in real time.
In the invention, the preposed inhibition area 1 is used for optimizing the strain of the suspended sludge which flows back to the preposed inhibition area in the sedimentation tank by controlling the pH value and the ammonia nitrogen concentration in the preposed inhibition area, inhibiting the activity of non-denitrifying functional bacteria (NOB) and promoting the growth of denitrifying functional bacteria (AOB).
The device for deep denitrification of the industrial wastewater by the anaerobic ammonia oxidation comprises an anaerobic ammonia oxidation system 2, wherein the water inlet end of the anaerobic ammonia oxidation system 2 is communicated with the water outlet end 1.6 of a preposed inhibition area 1. In the invention, the water outlet end of the preposed inhibition area 1 is preferably provided with a plurality of water distribution holes, and the water outlet of the preposed inhibition area 1 directly enters the anaerobic ammonia oxidation system 2 through the water distribution holes; the invention has no special requirements on the arrangement of the water distribution holes and can ensure that the water flow is smooth. In the invention, a second aeration system 2.1 and an immobilized filler layer 2.2 are sequentially arranged in the anaerobic ammonia oxidation system 2 from bottom to top; anaerobic ammonia oxidizing bacteria are attached to the immobilized filler layer 2.2. The present invention does not require any particular second aeration system 2.1, as long as aeration systems known to the person skilled in the art are used. In the present invention, the immobilized filler layer 2.2 is preferably a polyurethane filler and/or a polypropylene filler, and in the embodiment of the present invention, the immobilized filler layer 2.2 is a polyurethane filler, specifically a sponge filler; the loading amount of the immobilized filler layer 2.2 is preferably 40-60% of the effective volume of the anaerobic ammonia oxidation system 2; the anammox bacteria are preferably one or more of Ca, Brocadia, Ca, Kuenenia and Ca, Anamoxoglobus.
In the present invention, the anammox system 2 functions to remove NH from wastewater by using denitrifying functional bacteria (AOB)4 +Conversion of-N to NO2 -N, NH is generated by anaerobic ammonia oxidizing bacteria attached to an immobilized filler layer4 +-N and NO2 -Nitrogen gas is generated after the-N reaction.
The device for the anaerobic ammonia oxidation and deep denitrification of the industrial wastewater comprises O1AO2Denitrification zone 3, said O1AO2The water inlet end of the denitrification area 3 is communicated with the water outlet end of the anaerobic ammonia oxidation system 2. In the invention, the water outlet end of the anammox system 2 is preferably provided with a plurality of water distribution holes, and the outlet water of the anammox system 2 directly enters O through the water distribution holes1AO2A denitrification area 3. In the present invention, said O1AO2The denitrification area 3 comprises a first aeration area 3.1, an anoxic area 3.2 and a second aeration area 3.3 which are sequentially communicated in series; the first aeration zone 3.1 is communicated with the water outlet end of the anaerobic ammonia oxidation system 2; the water outlet ends of the first aeration zone 3.1 and the anoxic zone 3.2 are preferably provided with a plurality of water distribution holes, and the first aeration zone 3.1, the anoxic zone 3.2 and the second aeration zone 3.3 are communicated in series through the water distribution holes. In the present invention, the bottom of the first aeration zone 3.1 and the second aeration zone 3.3 are respectively provided with a third aeration system 3.4 and a fourth aeration system 3.6, and the present invention has no special requirement for the third aeration system 3.4 and the fourth aeration system 3.6, and can adopt aeration systems well known to those skilled in the art. In the invention, the anoxic zone 3.2 is communicated with a carbon source adding system 3.7; the carbon source adding system 3.7 is preferably arranged above the anoxic zone 3.2, and an outlet of the carbon source adding system 3.7 is connected into the anoxic zone 3.2; the invention has no special structure for the carbon source adding system 3.7The requirement (2) is that the addition of the carbon source can be realized; an agitator 3.5 is also preferably provided in the anoxic zone 3.2. In the invention, the second aeration zone 3.3 is provided with a water outlet; the second aeration zone 3.3 is also preferably provided with a water outlet backflow port, and the water outlet backflow port is connected with the water inlet end of the preposed inhibition zone 1; a reflux pump 6 is preferably arranged on a connecting pipeline between the water outlet reflux port and the prepositive inhibition area 1, and the reflux pump 6 is connected with an online ammonia nitrogen determinator 1.4 through a signal line. In the invention, the reflux pump 6 is linked with the on-line ammonia nitrogen determinator 1.4, and the reflux amount of the mixed liquid flowing out of the second aeration zone 3.3 can be adjusted through the reflux pump 6, so that the ammonia nitrogen concentration in the preposed inhibition zone is further controlled within a set range.
In the present invention, said O1AO2The aeration zone 3.1 in the denitrification zone 3 is used for aerating the residual NH in the anaerobic ammonia oxidation system 24 +Conversion of-N to NO2 -N, the anoxic zone 3.2 is used for adding a carbon source to NO2 --N and NO3 -N is denitrified into nitrogen, and the aeration zone II 3.3 is used for removing the residual carbon source in the anoxic zone 3.2 through aeration to complete the deep denitrification of the system.
The device for the advanced denitrification of the anaerobic ammonia oxidation of the industrial wastewater comprises a single sludge sedimentation tank system 4, wherein a water inlet of the single sludge sedimentation tank system 4 is communicated with a water outlet of a second aeration zone 3.3. In the invention, the single sludge sedimentation tank system 4 comprises a sedimentation tank 4.1, a sludge outlet 4.2 arranged at the bottom of the sedimentation tank 4.1 and a water outlet 4.3 arranged at the upper part, wherein the sludge outlet 4.2 is branched into a sludge return port and a sludge discharge port, the sludge return port is connected with the water inlet end of the preposed inhibition zone 1, and the sludge discharge port discharges sludge. The invention does not require any particular construction of the sedimentation basin 4.1, and sedimentation basins known to the person skilled in the art may be used. In the invention, the pipelines of the sludge return port and the sludge discharge port are preferably provided with a sludge return pump 7 and a sludge discharge pump 8 respectively; the sludge reflux pump 7 is preferably connected with the on-line ammonia nitrogen determinator 1.4 through a signal line. The present invention has no particular requirements for the sludge recirculation pump 7 and the sludge discharge pump 8, and pumps well known to those skilled in the art may be used.
In the invention, the sedimentation tank system 4 is used for dissolving O1AO2And the effluent of the denitrification area 3 is subjected to sludge-water separation.
The invention provides a method for deep denitrification of anaerobic ammonia oxidation of industrial wastewater, which comprises the following steps:
(1) the method comprises the steps that industrial wastewater to be treated enters a pre-inhibition area 1, the industrial wastewater is mixed with return sludge which flows back to the pre-inhibition area 1 from a sedimentation tank 4.1 through a sludge return port under the action of a first aeration system 1.1, alkaline substances are added through an alkali adding system 1.2 to adjust the pH value in the pre-inhibition area 1 to be 7.5-8.2, the flow of the return sludge adjusts the ammonia nitrogen concentration in the pre-inhibition area 1 to be 200-500 mg/L, and the pH value and the ammonia nitrogen concentration are monitored by an online pH meter 1.3 and an online ammonia nitrogen meter 1.4 in real time respectively;
(2) the wastewater treated by the preposed inhibition area 1 enters an anaerobic ammonia oxidation system 2, and NH in the wastewater is treated by ammonia oxidizing bacteria under the action of a second aeration system 2.14 +Conversion of-N to NO2 -N, NH utilization by anaerobic ammonium oxidizing bacteria attached to the immobilized packing layer 2.24 +-N and NO2 -Nitrogen and NO after N reaction3 --N；
(3) The wastewater treated by the anaerobic ammonium oxidation system 2 enters O1AO2The denitrification area 3 is used for removing the residual NH in the anaerobic ammonia oxidation system 2 under the action of a third aeration system 3.4 in the first aeration area 3.14 +Nitration of-N to NO2 --N；
The wastewater treated and flowing out of the aeration first zone 3.1 enters an anoxic zone 3.2, an organic carbon source is added into the anoxic zone 3.2 through a carbon source adding system 3.7, and NO is added2 --N and NO3 --denitrification of N to nitrogen;
the treated wastewater flowing out of the anoxic zone 3.2 enters an aeration second zone 3.3, and the residual organic carbon source in the anoxic zone 3.2 is removed under the action of a fourth aeration system 3.6;
(4) the wastewater treated by the second aeration zone 3.3 enters a single sludge sedimentation tank system 4, sludge-water separation is carried out in a sedimentation tank 4.1, the separated sludge part reflows to the preposed inhibition zone 1, the rest is discharged from a sludge discharge port, and the separated supernatant is discharged from a water outlet 4.3.
The method comprises the steps of enabling industrial wastewater to be treated to enter a preposed inhibition area 1, mixing the industrial wastewater with return sludge which flows back to the preposed inhibition area 1 from a sedimentation tank 4.1 through a sludge return port under the action of a first aeration system 1.1, adding an alkaline substance through an alkali adding system 1.2 to adjust the pH value in the preposed inhibition area 1 to be 7.5-8.2, adjusting the ammonia nitrogen concentration in the preposed inhibition area 1 to be 200-500 mg/L through the flow of the return sludge, and monitoring the pH value and the ammonia nitrogen concentration in real time through an online pH meter 1.3 and an online ammonia nitrogen meter 1.4 respectively to inhibit nitrite oxidizing bacteria in the return sludge and proliferate ammonia oxidizing bacteria. In the invention, the industrial wastewater to be treated is preferably high ammonia nitrogen sewage, and the ammonia nitrogen concentration of the high ammonia nitrogen sewage is preferably more than or equal to 500 mg/L. In the invention, the alkaline substance is preferably sodium hydroxide, and the pH value in the pre-inhibition zone 1 is preferably 7.8-8.0; the ammonia nitrogen concentration of the preposed inhibition zone 1 is preferably 300-400 mg/L; the invention optimizes the strain of the suspended sludge refluxed by the sedimentation tank by controlling the pH value and the ammonia nitrogen concentration in the preposed inhibition area 1, inhibits the activity of NOB (NOB), and promotes the growth of denitrifying functional bacteria (AOB).
In the present invention, when the flow rate of the returned sludge from the sludge return port to the pre-positioned inhibition zone 1 is not enough to dilute the ammonia nitrogen concentration of the industrial wastewater to be treated to be within the range value, the present invention preferably also partially returns the wastewater treated by the aeration zone two 3 to the pre-positioned inhibition zone 1 through the water outlet return port, i.e. the ammonia nitrogen concentration in the pre-positioned inhibition zone 1 is adjusted by the return of the sludge and the return of the mixed liquid treated by the aeration zone two 3.3.
In the invention, the hydraulic retention time of the pre-suppression zone 1 is preferably 30-60 min, and more preferably 40-50 min; the temperature in the pre-suppression zone 1 is preferably 28-32 ℃, and more preferably 29-31 ℃.
In the invention, the Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) are inoculated into the system (such as the pre-inhibition zone 1 or the anoxic zone 3.2) from the outside (such as activated sludge of a common municipal sewage plant or other industrial wastewater) at the initial stage of the operation of the system, and are gradually enriched and cultured and optimized in the system.
After the treatment of the preposed inhibition area 1 is finished, the invention leads the wastewater treated by the preposed inhibition area 1 to enter an anaerobic ammonia oxidation system 2, and under the action of a second aeration system 2.1, ammonia oxidizing bacteria lead NH in the wastewater4 +Conversion of-N to NO2 -N, attachment of anammox bacteria on the layer of immobilized packing 2.2 by NH4 +-N and NO2 -Nitrogen and NO after N reaction3 --N(NO3 -N is generated in small quantity, anaerobic ammonia oxidation generates about 11 percent of NO3 --N). In the present invention, the dissolved oxygen in the anammox system 2 is preferably 0.5mg/L or less. The anammox system 2 can remove 80-85% of TN (total nitrogen) by autotrophic denitrification.
Short-cut nitrification of single sludge system is difficult to control (NH)4 +-N is difficult to convert stably to NO2 --N), so the conventional systems are all double sludge systems; the front end of the anaerobic ammonia oxidation system is provided with the preposed inhibition area, microorganisms are inhibited and elutriated through substances in inlet water, non-denitrification functional bacteria are inhibited, the proliferation of ammonia oxidizing bacteria is maintained, the stable partial nitrification effect of the anaerobic ammonia oxidation system is realized, and the anaerobic ammonia oxidation system does not need to be provided with a sludge precipitation system.
After the anaerobic ammonia oxidation system 2 finishes the treatment, the invention leads the wastewater treated by the anaerobic ammonia oxidation system 2 to enter O1AO2The denitrification area 3 is used for removing the residual NH in the anaerobic ammonia oxidation system 2 under the action of a third aeration system 3.4 in the first aeration area 3.14 +Nitration of-N to NO2 --N. In the invention, the ammonia nitrogen concentration in the aeration zone 3.1 is preferably less than or equal to 5 mg/L.
After the treatment of the first aeration zone 3.1 is finished, the invention leads the treatment wastewater flowing out of the first aeration zone 3.1 to enter the anoxic zone 3.2, adds an organic carbon source into the anoxic zone 3.2 through a carbon source adding system 3.7, and adds NO into the anoxic zone 3.22 --N andNO3 -n is denitrified to nitrogen. In the invention, the organic carbon source preferably comprises sodium acetate and/or methanol, and the organic carbon source provides a carbon source for the denitrification process and is used as an electron donor of denitrifying bacteria; the addition amount of the organic carbon source is preferably NO2 -1.71 times the amount of N removed (amount of concentration) or NO3 -2.86 times the amount of N removed.
After the treatment in the anoxic zone 3.2 is finished, the invention makes the treated wastewater flowing out of the anoxic zone 3.2 enter the aeration second zone 3.3, and removes the residual organic carbon source in the anoxic zone 3.2 under the action of the fourth aeration system 3.6. In the present invention, the Dissolved Oxygen (DO) of the aerated second zone 3.3 is preferably 2.0mg/L or less.
The traditional double-sludge system relies on the traditional nitrification and denitrification for deep denitrification, generally an AO system, and NH is generated in the nitrification process of the traditional double-sludge system4 +Conversion of-N to NO3 -N, denitrification process to NO3 --N is reduced to nitrogen; the invention is provided with O1AO2A denitrification area which is a short-cut nitrification denitrification process, wherein the short-cut nitrification process is used for removing NH4 +Conversion of-N to NO2 -N, denitrification of NO2 --N is reduced to nitrogen.
After the treatment of the second aeration area 3.3 is finished, the wastewater treated by the second aeration area 3.3 enters a single sludge sedimentation tank system 4, sludge-water separation is carried out in a sedimentation tank 4.1, the separated sludge partially flows back to the preposed inhibition area 1, the rest is discharged from a sludge discharge port, and the separated supernatant is discharged from a water outlet 4.3. In the present invention, the reflux ratio of the sludge is preferably 0.5 to 1. In the invention, the mixed liquor treated by the second aeration zone 3.3 also partially flows back to the preposed inhibition zone 1 through the water outlet reflux port to further adjust the ammonia nitrogen concentration in the preposed inhibition zone 1. Compared with the traditional double-sludge system, the invention can save the sedimentation tank, the sludge reflux, sludge discharge and water distribution system matched with the sedimentation tank, the matched water pump, the pipeline, the control system, the instrument and other equipment, and can realize deep denitrification only by 1 set of sedimentation system.
The invention provides a method for deep denitrification of industrial wastewater by anaerobic ammonia oxidation, which is used for deep denitrification of industrial wastewater by anaerobic ammonia oxidation, the removal rate of Total Nitrogen (TN) is more than 97%, and most of industrial wastewater can meet the discharge standard after being treated by the device.
The apparatus and method for deep denitrification of industrial wastewater by anammox according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The water content of the wastewater generated in the process of preparing the glycol from certain coal is 4000m3And d, the ammonia nitrogen concentration is 500-1000 mg/L, the COD concentration is 500-1500 mg/L, and the wastewater belongs to typical low C/N process wastewater.
The coal chemical wastewater firstly enters a high-load aeration tank, the removal of refractory organic matters is realized in the high-load aeration tank, the effluent of the high-load aeration tank is subjected to deep denitrification anaerobic ammonia oxidation by adopting the device shown in FIG. 2, and the process is as follows:
the inlet water (namely the outlet water of the high-load aeration tank) and the return sludge flowing out of the sedimentation tank 4.1 enter the preposed inhibition area 1 to be mixed under the action of the first aeration system 1.1, and the sludge return flow is 4000-8000 m3D, controlling the ammonia nitrogen concentration of the preposed inhibition area 1 to be 200mg/L, not setting a nitrifying liquid reflux system (namely adjusting the ammonia nitrogen concentration of the preposed inhibition area only through refluxing sludge), setting an automatic alkali adding system 1.2 in the preposed inhibition area 1, controlling the pH value in the preposed inhibition area 1 to be about 8.0 by adding sodium hydroxide into the alkali adding system 1.2, and controlling the hydraulic retention time to be 30min and the temperature to be 30-32 ℃;
the mixed liquor of the preposed inhibition area flows through an anaerobic ammonia oxidation system 2, the area is provided with an immobilized filler layer 2.2, anaerobic ammonia oxidation bacteria (mainly Ca, Brocadia, Ca, Kuenenia and Ca, Anamoxoglobus, Ca, Brocadia) are attached and grown on the filler, the area is provided with a second aeration system 2.1, DO (dissolved oxygen) is controlled below 0.5mg/L, and NH (NH) in the mixed liquor is treated by ammonia oxidation bacteria (Nitrosomonas )4 +Conversion of-N to NO2 --N, anaerobic ammonia oxygen attached to the layer of immobilized packing 2.2Utilization of NH by bacteria4 +-N and NO2 -Nitrogen and small amounts of NO are formed after the-N reaction3 --N；
The mixed liquid of the anaerobic ammonia oxidation system 2 enters O1AO2A denitrification area 3 for adding the residual NH of the anaerobic ammonia oxidation system 2 in an aeration area 3.14 +Conversion of-N to NO2 --N, controlling the ammonia nitrogen concentration to be less than 5 mg/L; a small amount of external carbon source (methanol) is added into an anoxic zone 3.2 to add NO2 --N and NO3 --denitrification of N to nitrogen; finally, removing the carbon source which is excessively added in the second aeration zone 3.3 through aeration, and controlling the dissolved oxygen to be less than 2.0mg/L to complete the deep denitrification of the system;
O1AO2the effluent of the denitrification area 3 enters a sedimentation tank 4.1 for mud-water separation, part of the separated sludge flows back to the preposed inhibition area 1, the rest is discharged from a sludge discharge port, and the separated clear water is discharged from a clear water outlet 4.3.
Nitrosomonas (ammonia oxidizing bacteria, Nitrosomonas) is AOB (ammonia oxidizing bacteria) which is also a main functional bacterium of a short-cut nitrification process, and the main function of AOB is to remove NH4 +Conversion of-N to NO2 -N, AOB is a system of dominant bacteria, which shows that the system has good short-cut nitrification effect. Through detecting microorganisms in the running stable system, the abundance of Nitrosomonas in the suspended sludge sample in the preposed inhibition zone 1 is 8.3-10.6%, and the average abundance is 9.5%; the abundance of Nitrosomonas on the immobilized filler layer 2.2 is far less than 1%. The result shows that the enrichment of the Nitrosomonas in the suspended sludge sample is far greater than that of the immobilized filler layer, and the result shows that the proliferation of NOB (nitrite oxidizing bacteria) in the system is effectively elutriated through the arrangement of the preposed inhibition area, the stable proliferation of dominant flora such as Nitrosomonas in the system is promoted, and the stable short-cut nitrification effect is realized.
Meanwhile, the abundance of Ca.Brocadia on the immobilized filler layer of the anaerobic ammonia oxidation system of the system is 1.9-23.2%, the average abundance is 9.1%, and in the process of treating the wastewater containing the coal glycol, the Ca.Brocadia of the anaerobic ammonia oxidation bacteria is enriched on the sponge filler to form dominant bacteria, and the content of the suspended sludge is less. The abundance of Ca.Kuenenia in the suspended mud sample is 0.9-2.5%, and the average abundance is 1.9%; the abundance of Ca.Kuenenia on the immobilized filler layer is 1.6-10.5%, and the average abundance is 5.0%; the distribution of the Anmmoxoglobus in the suspended mud and the filler has no obvious difference, the abundance is 1.1-13.2%, the representative anaerobic ammonium oxidation bacteria such as Ca, Brocadia, Ca, Kuenenia, Ca, Anmmoxoglobus and the like are greatly enriched in the system, and ammonia nitrogen and nitrite nitrogen are converted into nitrogen through an anaerobic ammonium oxidation path, so that the autotrophic nitrogen removal of the system is realized.
During the stable operation of the system, the concentration of the ammonia nitrogen in the inlet water is 500-1000 mg/L, and the load of the anaerobic ammonia oxidation denitrification is 0.3-0.5 kg/m3/d，ΔNO3 --N/ΔNH4 +N is always lower than 0.11, the ammonia nitrogen concentration of the mixed liquor at the anaerobic ammonia oxidation end is lower than 30mg/L, the nitrate nitrogen concentration is 50-80 mg/L, and the nitrite nitrogen concentration is 30-50 mg/L; deep denitrification unit (i.e. O)1AO2Denitrogenation area) effluent ammonia nitrogen concentration is less than 5mg/L, nitrate nitrogen concentration is less than 5mg/L, nitrite nitrogen concentration is less than 3mg/L, TN is less than 15mg/L, average total nitrogen removal rate is more than 97%.
The embodiment shows that the device provided by the invention is a single sludge sedimentation system, the process complexity and the operation cost are reduced, the stability of the system can be ensured, the deep denitrification anaerobic ammonia oxidation is carried out on the industrial wastewater by adopting the device provided by the invention, and the Total Nitrogen (TN) removal rate is over 97 percent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides an industrial waste water anammox advanced denitrification's device which characterized in that includes:
the device comprises a preposed inhibition zone (1), wherein the preposed inhibition zone (1) comprises a water inlet end (1.5) and a water outlet end (1.6), a first aeration system (1.1) is arranged at the bottom in the preposed inhibition zone (1), and the preposed inhibition zone (1) is communicated with an alkali adding system (1.2); the pre-inhibition zone (1) is also provided with an online pH determinator (1.3) and an online ammonia nitrogen determinator (1.4), and the online pH determinator (1.3) is simultaneously connected with the alkali adding system (1.2) through a signal line;
the anaerobic ammonia oxidation system (2) is communicated with a water outlet end (1.6) of the preposed inhibition area (1) at a water inlet end, a second aeration system (2.1) and an immobilized filler layer (2.2) are sequentially arranged in the anaerobic ammonia oxidation system (2) from bottom to top, and anaerobic ammonia oxidizing bacteria are attached to the immobilized filler layer (2.2);
o with water inlet end communicated with water outlet end of anaerobic ammonia oxidation system (2)1AO2Denitrification zone (3), said O1AO2The denitrification area (3) comprises a first aeration area (3.1), an anoxic area (3.2) and a second aeration area (3.3) which are sequentially communicated in series; the first aeration zone (3.1) is communicated with the water outlet end of the anaerobic ammonia oxidation system (2), and the inner bottoms of the first aeration zone (3.1) and the second aeration zone (3.3) are respectively provided with a third aeration system (3.4) and a fourth aeration system (3.6); the anoxic zone (3.2) is communicated with a carbon source adding system (3.7); the second aeration area (3.3) is provided with a water outlet;
the water inlet with single sludge sedimentation tank system (4) of the delivery port intercommunication in two areas of aeration (3.3), single sludge sedimentation tank system (4) include sedimentation tank (4.1), set up in sludge outlet (4.2) and the delivery port (4.3) on upper portion of sedimentation tank (4.1) bottom, sludge outlet (4.2) branch is mud backward flow mouth and mud discharge port, mud backward flow mouth and the end intercommunication of intaking of leading suppression district (1).
2. The apparatus according to claim 1, characterized in that an agitator (3.5) is also provided in the anoxic zone (3.2).
3. The device according to claim 1, characterized in that the layer of immobilized filler (2.2) is a polyurethane filler and/or a polypropylene filler; the filling amount of the immobilized filler layer (2.2) is 40-60% of the effective volume of the anaerobic ammonia oxidation system (2).
4. The device according to claim 1, characterized in that the aeration zone two (3.3) is further provided with a water outlet return port which is communicated with the water inlet end of the prepositive inhibition zone (1); and a reflux pump (6) is arranged on a connecting pipeline of the water outlet reflux port and the preposed inhibition area (1), and the reflux pump (6) is connected with an online ammonia nitrogen determinator (1.4) through a signal line.
5. The device according to claim 1, characterized in that the sludge return port and the sludge discharge port are respectively provided with a sludge return pump (7) and a sludge discharge pump (8); the sludge reflux pump (7) is connected with the online ammonia nitrogen determinator (1.4) through a signal line.
6. The method for deep denitrification of industrial wastewater by anaerobic ammonia oxidation is characterized by comprising the following steps:
(1) the method comprises the steps that industrial wastewater to be treated enters a pre-inhibition area (1), is mixed with return sludge which flows back to the pre-inhibition area (1) from a sedimentation tank (4.1) through a sludge return port under the action of a first aeration system (1.1), alkaline substances are added through an alkali adding system (1.2) to adjust the pH value in the pre-inhibition area (1) to be 7.5-8.2, the ammonia nitrogen concentration in the pre-inhibition area (1) is adjusted to be 200-500 mg/L by the flow of the return sludge, and the pH value and the ammonia nitrogen concentration are respectively monitored by an online pH determinator (1.3) and an online ammonia nitrogen determinator (1.4) in real time;
(2) the wastewater treated by the preposed inhibition area (1) enters an anaerobic ammonia oxidation system (2), and NH in the wastewater is treated by ammonia oxidizing bacteria under the action of a second aeration system (2.1)4 +Conversion of-N to NO2 -N, NH utilization by anammox bacteria attached to the layer of immobilized packing (2.2)4 +-N and NO2 -Nitrogen and NO after N reaction3 --N；
(3) The wastewater treated by the anaerobic ammonia oxidation system (2) enters O1AO2The denitrification area (3) is used for removing the residual NH in the anaerobic ammonia oxidation system (2) under the action of a third aeration system (3.4) in the first aeration area (3.1)4 +N nitrationIs NO2 --N；
The wastewater treated from the aeration zone I (3.1) enters an anoxic zone (3.2), and organic carbon source is added into the anoxic zone (3.2) through a carbon source adding system (3.7) to add NO2 --N and NO3 --N is denitrified to nitrogen;
the treated wastewater flowing out of the anoxic zone (3.2) enters an aeration second zone (3.3), and the residual organic carbon source in the anoxic zone (3.2) is removed under the action of a fourth aeration system (3.6);
(4) the wastewater treated by the aeration second zone (3.3) enters a single sludge sedimentation tank system (4), sludge and water are separated in a sedimentation tank (4.1), the separated sludge partially flows back to the preposed inhibition zone (1), the rest is discharged from a sludge discharge port, and the separated supernatant is discharged from a water outlet (4.3).
7. A method according to claim 6, characterized in that the wastewater treated by the aerated second zone (3.3) is also partially returned to the pre-suppression zone (1) through the outlet water return.
8. The method according to claim 6, characterized in that the hydraulic retention time of the pre-suppression zone (1) in the step (1) is 30-60 min; the temperature in the preposed inhibition zone (1) is 28-32 ℃.
9. The method according to claim 6, wherein the dissolved oxygen in the anammox system (2) in step (2) is 0.5mg/L or less.
10. The method according to claim 6, characterized in that the ammonia nitrogen concentration in the aeration zone (3.1) in the step (3) is less than or equal to 5 mg/L; the organic carbon source added in the anoxic zone (3.2) comprises sodium acetate and/or methanol; the dissolved oxygen in the second aeration zone (3.3) is less than or equal to 2.0 mg/L.
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| CN114560595A (en) * | 2022-03-01 | 2022-05-31 | 北京坦思环保科技有限公司 | Treatment method and treatment system for kitchen waste biogas slurry |
| CN115108690A (en) * | 2022-08-09 | 2022-09-27 | 北京交通大学 | Anaerobic ammonia oxidation treatment system for treating high ammonia nitrogen and high COD wastewater |
| CN115253387B (en) * | 2022-08-12 | 2023-12-08 | 中原环保股份有限公司 | Ammonia blowing cabinet and ammonia blowing method |
| CN115557611A (en) * | 2022-11-02 | 2023-01-03 | 无锡马盛环境能源科技有限公司 | Denitrification system for treating high ammonia nitrogen wastewater of kitchen |
| CN116102166A (en) * | 2022-12-14 | 2023-05-12 | 北京城市排水集团有限责任公司 | Enhanced integrated autotrophic nitrogen removal method based on addition of miniature suspension carrier |
| CN115806371A (en) * | 2022-12-19 | 2023-03-17 | 中蓝连海设计研究院有限公司 | Biological denitrification method for high-salinity high-calcium epoxy propane wastewater |
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