CN114853173A - Method for treating aged landfill leachate by continuous flow fixed bed autotrophic denitrification - Google Patents
Method for treating aged landfill leachate by continuous flow fixed bed autotrophic denitrification Download PDFInfo
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Abstract
A method for treating aged landfill leachate by continuous flow fixed bed autotrophic denitrification relates to a method for treating aged landfill leachate. The method comprises the following steps: firstly, establishing a continuous flow fixed bed autotrophic nitrogen removal system; secondly, adapting the continuous flow fixed bed autotrophic nitrogen removal system; and thirdly, treating the aged landfill leachate. The method of the invention is based on the PN/A autotrophic denitrification sludge containing a large amount of ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, and adopts the PN/A autotrophic denitrification sludge to economically and effectively realize the purpose of a landfill leachate single-stage continuous flow autotrophic denitrification system by controlling the intermittent aeration and the aeration quantity and gradually improving the concentration of the inlet ammonia nitrogen and the concentration of the landfill leachate and other activity recovery strategies.
Description
Technical Field
The invention relates to a treatment method of aged landfill leachate.
Background
According to the data of the national statistical bureau, the daily output of garbage per capita in China is 1.0-1.2 kg, the annual output of garbage per capita in China is 400 kg, and the annual output of household garbage is the first to live in the world of more than four hundred million tons. The types of municipal solid waste vary greatly with living habits and economic levels in various regions. The sanitary landfill is the main mode of the current garbage disposal in China, and researches show that under the conditions that the water content of the garbage is about 50 averagely (the highest water content) and the degradable components are 30-35%, 0.05-0.2 ton of garbage percolate is generated when 1 ton of garbage is buried. The landfill leachate is high-concentration organic wastewater with complex components, mainly comes from water contained in the garbage, water generated in a catabolic process, rain, snow water entering a landfill site and other water, the water quality characteristics of the landfill leachate are mainly determined by the age of the landfill and the type of the landfill, the landfill leachate generated in the landfill period of 0-5 years is generally fresh landfill leachate (fresh land and fill leach), the landfill leachate generated in the landfill period of 5-10 years is called medium-term landfill leachate, and the landfill leachate with the landfill period of more than 10 years becomes old landfill leachate. The total amount of pollutants contained in one hundred tons of municipal sewage per ton of landfill leachate is equivalent, the harm degree of the landfill leachate is far higher than that of the municipal sewage, and serious threats are brought to the natural environment and the human health.
Aiming at the water quality characteristics of old landfill leachate, such as complex components, high concentration of organic matters and ammonia nitrogen, imbalance of proportion of microbial nutrient elements and the like, the leachate cannot be economically and efficiently treated by adopting a single treatment technology. The traditional fully mixed flocculent activated sludge is adopted to treat the aged landfill leachate, so that the defects of sludge loss, direct inhibition of anaerobic ammonium oxidation bacteria by toxic substances in the leachate, low system fault tolerance and the like exist.
Disclosure of Invention
In order to overcome the defects of sludge loss, direct inhibition of anaerobic ammonium oxidation bacteria by toxic substances in leachate, low system fault tolerance and the like of the old landfill leachate method, the invention provides a method for treating the old landfill leachate by continuous flow fixed bed autotrophic denitrification.
A device used in the method comprises a water inlet tank (1), a peristaltic pump (2), a reaction chamber (23), a secondary sedimentation tank (7), a return pipe (10), a connecting pipe (19), an air pump (12), an aeration pipe (13), a water outlet pipe (8) and a water inlet pipe (3);
the water inlet tank (1) is communicated with the peristaltic pump (2), and the peristaltic pump (2) is communicated with the reaction chamber (23) through a water inlet pipe (3);
the reaction chamber (23) is communicated with the secondary sedimentation tank (7) by a connecting pipe (19);
the water outlet pipe (8) is connected with the secondary sedimentation tank (7); a reflux pump (16) is arranged between the secondary sedimentation tank (7) and the water inlet pipe (3), and the secondary sedimentation tank (7) is communicated with the reflux pump (16) and the reflux pump (16) is communicated with the water inlet pipe (3) through a reflux pipe (10);
the reaction chamber (23) is divided into four chambers, namely a chamber A, a chamber B, a chamber C and a chamber D in sequence along the water flow direction; a construction clapboard (26) is arranged between the chambers, and the construction clapboard (26) is provided with holes;
fixed packing module assemblies (25) are arranged in the chamber A, the chamber B, the chamber C and the chamber D;
microporous aeration heads (15) are arranged in the chamber B, the chamber C and the chamber D; the air pump (12) is connected with the microporous aeration head (15) through an aeration pipe (13);
the method comprises the following steps:
establishing stage of continuous flow fixed bed autotrophic nitrogen removal system
Autotrophic denitrification sludge is inoculated on the fixed filler module component (25), then manual water distribution is used as inlet water, and the hydraulic retention time in the reaction chamber (23) is controlled to be 48 h;
firstly, the chamber A of the reaction chamber (23) is not aerated, the chamber B, the chamber C and the chamber D of the reaction chamber (23) are aerated, the aeration flow rates are respectively 30mL/min, 30mL/min and 30mL/min, and the aeration time and the aeration stop time are respectively 120min and 240 min; after the ammonia nitrogen removal rate in the effluent is stably increased and maintained, the aeration flow rates of a chamber B, a chamber C and a chamber D of the reaction chamber (23) are respectively kept at 30mL/min, 30mL/min and 30mL/min, and the aeration time and the aeration stop time are gradually adjusted to 60min and 60 min; after the ammonia nitrogen removal rate in the effluent is stably increased and is maintained to be stable again, the aeration flow rates of a chamber B, a chamber C and a chamber D of the reaction chamber (23) are gradually adjusted to 60mL/min, 60mL/min and 60mL/min, the aeration time and the aeration stop time are kept to be 60min and 60min, the reflux flow rate is reduced to be equal to the water inlet flow rate, and the recovery of the continuous flow fixed bed autotrophic nitrogen removal system is completed until the ammonia nitrogen in the effluent is lower than 10mg/L, the total nitrogen in the effluent is lower than 35mg/L and the total nitrogen removal rate reaches more than 80%;
second, adaptation stage of continuous flow fixed bed autotrophic nitrogen removal system
Changing the inlet water into 10-time diluted landfill leachate, and gradually increasing the aeration amount of a B chamber, a C chamber and a D chamber of a reaction chamber (23) to 120mL/min, 120mL/min and 120 mL/min; until the water in the reaction chamber (23) is clear and no obvious suspended sludge exists, the aeration flow rates of the chamber B, the chamber C and the chamber D of the reaction chamber (23) are increased to 150mL/min, 150mL/min and 150 mL/min; when the ammonia nitrogen of the effluent is lower than 50mg/L, the total nitrogen of the effluent is lower than 70mg/L, and the total nitrogen removal rate reaches more than 80 percent, the adaptation of the continuous flow fixed bed autotrophic nitrogen removal system is realized;
thirdly, treating the aged landfill leachate
Taking old landfill leachate as inlet water, controlling the hydraulic retention time in the reaction chamber (23) to be 48h, not aerating the chamber A of the reaction chamber (23), aerating the chamber B, the chamber C and the chamber D of the reaction chamber (23), wherein the aeration flow rates are 150mL/min, 150mL/min and 150mL/min respectively; the reflux flow rate is equal to the feed water flow rate; namely, the treatment of the aged landfill leachate is realized;
wherein, ammonia nitrogen is 200mg N/L, sodium bicarbonate is 1700mg/L, magnesium sulfate is 200mg/L, calcium chloride is 150mg/L, and monopotassium phosphate is 27mg/L in the artificial water preparation in the step one.
The method is based on the PN/A (nitrosation-anaerobic ammonia oxidation technology) autotrophic denitrification sludge with a large amount of Ammonia Oxidizing Bacteria (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB), and adopts the PN/A autotrophic denitrification sludge to economically and effectively realize the purpose of a landfill leachate single-stage continuous flow autotrophic denitrification system by controlling the intermittent aeration and the aeration quantity and gradually improving the concentration of the inlet ammonia nitrogen and the concentration of the landfill leachate and other activity recovery strategies.
In the first step of the method, the activity of the AOB and the activity of the anammox bacteria are synchronously recovered by low aeration amount (30mL/min) and intermittent aeration.
According to the method, after the ammonia nitrogen removal rate in the effluent water in the first step is stabilized for the first time, the aeration stop time is gradually reduced, the total aeration amount is gradually increased (the aeration flow is kept at 30mL/min, and the aeration time and the aeration stop time are gradually adjusted to 60min and 60min), and half of ammonia nitrogen is converted into nitrite in the process.
According to the method, after the ammonia nitrogen removal rate in the effluent is stabilized for the second time, the aeration time and the aeration stop time are kept unchanged, and the aeration flow rates (60mL/min) of a chamber B, a chamber C and a chamber D of a reaction chamber (23) are increased, so that the activities of anaerobic ammonium oxidation bacteria and ammonium oxidation bacteria are balanced, and the accumulation condition of nitrite is reduced.
In the second step of the method, the ammonia nitrogen concentration of the inlet water is increased to more than 400mg N/L.
The method has the advantages that: (1) under the condition of not adding external carbon source, the difficult problem of the treatment of the garbage leachate at the late stage with high ammonia nitrogen and low carbon nitrogen ratio is realized, the high-efficiency biological denitrification is completed, the carbon source is saved, and the operating cost is greatly reduced.
(2) The fixed bed reaction chamber (23) adopts a mode of culturing autotrophic denitrifying bacteria by adopting a filler biofilm culture to avoid generating excess sludge, thereby solving the difficulty of treating the excess sludge, and simultaneously weakening the inhibition of toxic substances in leachate on anaerobic ammonium oxidation bacteria due to the existence of a biological membrane.
(3) The invention can quickly, economically and effectively realize the single-stage continuous flow autotrophic nitrogen removal system of the landfill leachate by controlling the aeration time, the aeration quantity and the hydraulic retention time, does not depend on adding of extra medicament, and has good application prospect.
(4) The invention can promote the transformation of the traditional biological denitrification sewage plant to a novel high-efficiency low-energy-consumption sewage plant in the future by modifying the existing reaction facility for sewage treatment of the refuse landfill, and simultaneously saves a large amount of capital construction cost.
Drawings
FIG. 1 is a schematic diagram of an apparatus used in one embodiment of a method;
FIG. 2 is a schematic top view of the water bath incubator (22) of the apparatus used in one embodiment of the method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: referring to the embodiment described in fig. 1 and fig. 2, the continuous flow fixed bed autotrophic nitrogen removal method for treating aged landfill leachate in the embodiment includes a water inlet tank 1, a peristaltic pump 2, a reaction chamber 23, a secondary sedimentation tank 7, a return pipe 10, a connecting pipe 19, an air pump 12, an aeration pipe 13, a water outlet pipe 8 and a water inlet pipe 3;
the water inlet tank 1 is communicated with the peristaltic pump 2, and the peristaltic pump 2 is communicated with the reaction chamber 23 through a water inlet pipe 3;
the reaction chamber 23 is communicated with the secondary sedimentation tank 7 through a connecting pipe 19;
the water outlet pipe 8 is connected with the secondary sedimentation tank 7; a reflux pump 16 is arranged between the secondary sedimentation tank 7 and the water inlet pipe 3, and the secondary sedimentation tank 7 is communicated with the reflux pump 16 and the reflux pump 16 is communicated with the water inlet pipe 3 through a reflux pipe 10;
the reaction chamber 23 is divided into four chambers, namely a chamber A, a chamber B, a chamber C and a chamber D in sequence along the water flow direction; a construction clapboard 26 is arranged between the chambers, and the construction clapboard 26 is provided with holes;
fixed packing module assemblies 25 are arranged in the chamber A, the chamber B, the chamber C and the chamber D;
the chambers B, C and D are provided with microporous aeration heads 15; the air pump 12 is connected with the microporous aeration head 15 through an aeration pipe 13; the device also comprises a water bath insulation can 22, and the reaction chamber 23, the water collecting tank 5 and the water outlet tank 6 are all arranged in the water bath insulation can 22;
the method comprises the following steps:
establishing stage of continuous flow fixed bed autotrophic nitrogen removal system
The fixed filler module component 25 is inoculated with autotrophic denitrification sludge, and then manual water distribution is used as inlet water, and the hydraulic retention time in the reaction chamber 23 is controlled to be 48 hours;
firstly, the chamber of the reaction chamber 23A is not aerated, the chamber of the reaction chamber 23B, the chamber C and the chamber D are aerated, the aeration flow rates are respectively 30mL/min, 30mL/min and 30mL/min, the aeration time and the aeration stop time are respectively 120min and 240min, and the initial reflux ratio is 1000%; after the ammonia nitrogen removal rate in the effluent is stably increased and maintained, the aeration flow rates of the chamber 23B, the chamber C and the chamber D are respectively kept at 30mL/min, 30mL/min and 30mL/min, and the aeration time and the aeration stop time are gradually adjusted to 60min and 60 min; after the removal rate of ammonia nitrogen in the effluent is stably increased and is maintained to be stable again, the aeration flow rates of the chamber 23B, the chamber C and the chamber D are gradually adjusted to 60mL/min, 60mL/min and 60mL/min, the aeration time and the aeration stop time are kept to 60min and 60min, the reflux flow rate is reduced to be equal to the inflow rate (namely the reflux ratio is 100 percent), and the recovery of the fixed bed autotrophic nitrogen removal system is completed when the ammonia nitrogen in the effluent is lower than 10mg/L, the total nitrogen in the effluent is lower than 35mg/L and the removal rate of the total nitrogen reaches more than 80 percent;
second, adaptation stage of continuous flow fixed bed autotrophic nitrogen removal system
Changing the water inlet into 10-time diluted landfill leachate ammonia nitrogen concentration to 400mg N/L, and gradually increasing the aeration quantity of a reaction chamber 23B chamber, a reaction chamber C chamber and a reaction chamber D chamber to 120mL/min, 120mL/min and 120 mL/min; until the water quality in the reaction chamber 23 is clear and no obvious suspended sludge exists, the aeration flow rates of the chamber B, the chamber C and the chamber D of the reaction chamber 23 are increased to 150mL/min, 150mL/min and 150 mL/min; when the ammonia nitrogen of the effluent is lower than 50mg/L, the total nitrogen of the effluent is lower than 70mg/L, and the total nitrogen removal rate reaches more than 80 percent, the adaptation of the continuous flow fixed bed autotrophic nitrogen removal system is realized;
thirdly, treating the aged landfill leachate
Taking old landfill leachate as inlet water, controlling the hydraulic retention time in the reaction chamber 23 to be 48h, not aerating the chamber of the reaction chamber 23A, aerating the chamber of the reaction chamber 23B, the chamber C and the chamber D, wherein the aeration flow rates are 150mL/min, 150mL/min and 150mL/min respectively; the reflux flow rate is equal to the feed water flow rate; namely, the treatment of the aged landfill leachate is realized;
wherein, ammonia nitrogen is 200mg N/L, sodium bicarbonate is 1700mg/L, magnesium sulfate is 200mg/L, calcium chloride is 150mg/L, and monopotassium phosphate is 27mg/L in the artificial water preparation in the step one.
The autotrophic nitrogen removal sludge is the autotrophic nitrogen removal sludge used by the original municipal sewage treatment plant for treating sludge digestive juice. The amount of autotrophic denitrification sludge inoculated sludge was 6.8L (MLSS 22.05g/L, MLVSS 9.12g/L), and the reaction chamber 23 had a volume of 6.6L for each of the four chambers.
In the embodiment, raw water in the water inlet tank 1 is input into a reaction chamber 23 of the plug-flow type fixed bed reaction device through the water inlet pipe 3 by the peristaltic pump 2, the inlet water flows among the reaction chambers through holes on the constructed partition plates, the outlet water overflows to a secondary sedimentation tank through an outlet weir on the outlet trough, and the constructed partition plates divide the reaction chamber 23 into four reaction chambers with equal size. The time relay controls the aeration and the aeration stop of the air pump, the gas flowmeter controls the aeration flow of the microporous aeration head, the dissolved oxygen monitoring probe and the pH monitoring probe which are connected with the dissolved oxygen and pH monitor are used for measuring DO and pH in the reaction chamber 23, and the water bath heat preservation box is used for keeping the operating temperature of the reaction chamber 23.
In the present embodiment, the number of holes in each of the constructed partition plates 26 is 2 to 4, and the diameter of each hole is 1 cm.
The device used in the embodiment also comprises a time relay 11, the air pump 12 is controlled by the time relay 11, and an air flow meter 14 is arranged on an aeration pipe 13. The device also comprises a dissolved oxygen monitoring probe 17, a pH monitoring probe 18, a filler fixing screen plate 20 and a dissolved oxygen and pH monitor 24; the dissolved oxygen monitoring probe 17 is arranged in the cavity of the reaction chamber 23A; the pH monitoring probe 18 is arranged in the reaction chamber 23B; the dissolved oxygen monitoring probe 17 and the pH monitoring probe 18 are connected with a dissolved oxygen and pH monitor 24; the fixed packing module assemblies 25 are fixed below the packing retention screen 20.
In the present embodiment, the reaction chamber 23A is set to pre-denitrification without aeration.
In the first step of the embodiment, the ammonia nitrogen removal rate in the effluent is maintained stable again, then the reflux flow is further reduced to be equal to the inflow flow, the running cost is reduced by controlling the rotating speed of the reflux pump, and the concentration of the effluent trinitrogen (ammonia Nitrogen (NH) 3 -N), nitriteNitrogen (NO) 2 -N), nitrate Nitrogen (NO) 3 -N)) is not significantly changed and the nitrate nitrogen remains less than the theoretical stoichiometric ratio.
As can be seen from the analysis of the conversion of the nitrogen along the reaction chamber 23, the total nitrogen removal capacities of the fixed packing module assemblies in different stages of the first step are not greatly different from those in the chamber A, the chamber B, the chamber C and the chamber D, the liquid mixing effects among different chambers are weakened due to the small hole areas among the constructed partition plates in the second step, and the total nitrogen removal capacities are obviously different (for example, when the first step is completed, the concentrations of ammonia nitrogen, nitrite and nitrate nitrogen in the chamber A are 54.03mg N/L, 0.87mg N/L and 12.99mg N/L respectively, and the concentrations of ammonia nitrogen, nitrite and nitrate nitrogen in the chamber B are 50.62mg N/L, 0.585mg N/L and 13.37mg N/L respectively), so that the expected layering effect is achieved.
The second embodiment is as follows: the present embodiment is different from the first embodiment in that: the side stream autotrophic nitrogen removal biomembrane sludge is stored at a low temperature of 4 ℃. The rest is the same as the first embodiment.
Example 1
Introducing the aged landfill leachate into a continuous flow fixed bed autotrophic nitrogen removal system which finishes the adaptation stage (step two) of the continuous flow fixed bed autotrophic nitrogen removal system in the first embodiment, controlling the hydraulic retention time in the reaction chamber 23 to be 48h, not aerating the chamber of the reaction chamber 23A, aerating the chamber of the reaction chamber 23B, the chamber C and the chamber D, wherein the aeration flow rates are 150mL/min, 150mL/min and 150mL/min respectively; the reflux flow rate is equal to the feed water flow rate; thus realizing the treatment of the aged landfill leachate.
The present embodiment utilizes the water bath incubator 22 to control the operating temperature of the reaction chamber 23 within 28 + -2 deg.C.
The water quality components of the actual aged garbage leachate are shown in table 1:
TABLE 1
| Index (I) | Concentration of | Index (I) | Concentration of |
| |
8 | Cr | 7.6*10 -2 |
| SS | 275 | Hg | 6.83*10 -3 |
| NH 4 + | 2100±500 | As | 1.22*10 -3 |
| COD | 4000 | Pb | 2.56*10 -1 |
| TP | 15.1 | Sn | 1.85*10 -2 |
And (3) the autotrophic nitrogen removal system is established at the end of the stage to discharge water and generate three nitrogen: 8.75mg N/L of ammonia nitrogen, 2.56mg N/L of nitrite ammonia nitrogen and 18.03mg N/L of nitrate ammonia nitrogen.
The final effluent of the 10-fold dilution operation stage is trinitrogen: 51.68mg N/L ammonia nitrogen, 2.43mg N/L nitrite ammonia nitrogen and 15.98mg N/L nitrate ammonia nitrogen.
The ammonia nitrogen of the effluent of the actual aged landfill leachate treatment is lower than 50mg/L, the total nitrogen of the effluent is lower than 70mg/L, and the total nitrogen removal rate reaches more than 80%.
Claims (4)
1. The method for treating the aged landfill leachate by continuous flow fixed bed autotrophic denitrification is characterized in that the device used in the method comprises a water inlet tank (1), a peristaltic pump (2), a reaction chamber (23), a secondary sedimentation tank (7), a return pipe (10), a connecting pipe (19), an air pump (12), an aeration pipe (13), a water outlet pipe (8) and a water inlet pipe (3);
the water inlet tank (1) is communicated with the peristaltic pump (2), and the peristaltic pump (2) is communicated with the reaction chamber (23) through a water inlet pipe (3);
the reaction chamber (23) is communicated with the secondary sedimentation tank (7) by a connecting pipe (19);
the water outlet pipe (8) is connected with the secondary sedimentation tank (7); a reflux pump (16) is arranged between the secondary sedimentation tank (7) and the water inlet pipe (3), and the secondary sedimentation tank (7) is communicated with the reflux pump (16) and the reflux pump (16) is communicated with the water inlet pipe (3) through a reflux pipe (10);
the reaction chamber (23) is divided into four chambers, namely a chamber A, a chamber B, a chamber C and a chamber D in sequence along the water flow direction; a construction clapboard (26) is arranged between the chambers, and the construction clapboard (26) is provided with holes;
fixed packing module assemblies (25) are arranged in the chamber A, the chamber B, the chamber C and the chamber D;
microporous aeration heads (15) are arranged in the chamber B, the chamber C and the chamber D; the air pump (12) is connected with the microporous aeration head (15) through an aeration pipe (13);
the method comprises the following steps:
establishing stage of continuous flow fixed bed autotrophic nitrogen removal system
Autotrophic denitrification sludge is inoculated on the fixed filler module component (25), then manual water distribution is used as inlet water, and the hydraulic retention time in the reaction chamber (23) is controlled to be 48 h;
firstly, the chamber A of the reaction chamber (23) is not aerated, the chamber B, the chamber C and the chamber D of the reaction chamber (23) are aerated, the aeration flow rates are respectively 30mL/min, 30mL/min and 30mL/min, and the aeration time and the aeration stop time are respectively 120min and 240 min; after the ammonia nitrogen removal rate in the effluent is stably increased and maintained, the aeration flow rates of a chamber B, a chamber C and a chamber D of the reaction chamber (23) are respectively kept at 30mL/min, 30mL/min and 30mL/min, and the aeration time and the aeration stop time are gradually adjusted to 60min and 60 min; after the ammonia nitrogen removal rate in the effluent is stably increased and is maintained to be stable again, the aeration flow rates of a chamber B, a chamber C and a chamber D of the reaction chamber (23) are gradually adjusted to 60mL/min, 60mL/min and 60mL/min, the aeration time and the aeration stop time are kept to 60min and 60min, the reflux flow rate is reduced to be equal to the inflow water flow rate, and the recovery of the continuous flow fixed bed autotrophic nitrogen removal system is completed until the ammonia nitrogen in the effluent is lower than 10mg/L, the total nitrogen in the effluent is lower than 35mg/L and the total nitrogen removal rate reaches more than 80%;
second, adaptation stage of continuous flow fixed bed autotrophic nitrogen removal system
Changing the inlet water into 10-time diluted landfill leachate, and gradually increasing the aeration amount of a B chamber, a C chamber and a D chamber of a reaction chamber (23) to 120mL/min, 120mL/min and 120 mL/min; until the water quality in the reaction chamber (23) is clear and no obvious suspended sludge exists, the aeration flow of the B chamber, the C chamber and the D chamber of the reaction chamber (23) is increased to 150mL/min, 150mL/min and 150 mL/min; when the ammonia nitrogen of the effluent is lower than 50mg/L, the total nitrogen of the effluent is lower than 70mg/L, and the total nitrogen removal rate reaches more than 80 percent, the adaptation of the continuous flow fixed bed autotrophic nitrogen removal system is realized;
thirdly, treating the aged landfill leachate
Taking old landfill leachate as inlet water, controlling the hydraulic retention time in the reaction chamber (23) to be 48h, not aerating the chamber A of the reaction chamber (23), aerating the chamber B, the chamber C and the chamber D of the reaction chamber (23), wherein the aeration flow rates are 150mL/min, 150mL/min and 150mL/min respectively; the reflux flow rate is equal to the feed water flow rate; namely, the treatment of the aged landfill leachate is realized;
wherein, ammonia nitrogen is 200mg N/L, sodium bicarbonate is 1700mg/L, magnesium sulfate is 200mg/L, calcium chloride is 150mg/L, and monopotassium phosphate is 27mg/L in the artificial water preparation in the step one.
2. The method for continuous flow fixed bed autotrophic anammox treatment of old landfill leachate according to claim 1, wherein the side stream autotrophic anammox biofilm sludge is stored at a low temperature of 4 ℃.
3. The method of claim 1, wherein the initial reflux ratio in step one is 1000%.
4. The continuous flow fixed bed autotrophic nitrogen removal method for treating aged landfill leachate according to claim 1, wherein the number of holes on each construction partition (26) is 2-4, and the diameter of the holes is 1 cm.
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