CN109748394B - Landfill leachate SBBR-SBR deep denitrification combined treatment process - Google Patents
Landfill leachate SBBR-SBR deep denitrification combined treatment process Download PDFInfo
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a landfill leachate SBBR-SBR deep denitrification combined treatment process. The sewage enters an SBBR to be stirred, filler and activated sludge begin to absorb carbon sources to form internal carbon sources, then the activated sludge in the SBBR is pumped into an SBR2 reactor to be aerated and nitrified, at the moment, the sludge after the nitrification of SBR1 is pumped into the SBBR to generate internal denitrification, a large amount of internal carbon sources are adsorbed by a biological membrane in the filler at the last stage and are used for denitrification, after the denitrification is finished, precipitation and drainage are carried out, the next cycle is carried out, and the functions of SBR1 and SBR2 are exchanged; the deep denitrification of the landfill leachate is realized by the treatment process without adding any carbon source; the biological filler in the SBBR adsorbs a large amount of internal carbon sources, and the endogenous denitrification rate is high; the nitrification process and the denitrification process are separated, the internal carbon source is not consumed in an aerobic stage, and compared with the traditional endogenous denitrification, the speed is much higher; and finally, the total nitrogen of the effluent of the SBBR is lower than 50mg/L and directly reaches the national emission standard.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a landfill leachate SBBR-SBR deep denitrification combined treatment process.
Background
After the refractory nitrogenous organic wastewater such as coking, chemical engineering, petrifaction, printing and dyeing, papermaking, medicines, pesticides, garbage leachate and the like is subjected to secondary biochemical treatment, ammonia nitrogen and most organic matters can be effectively removed, but the wastewater still contains refractory organic matters with certain concentration, nitrate nitrogen, organic nitrogen and ammonia nitrogen, the biodegradability of secondary biochemical effluent is extremely poor, and the requirements of discharge and reuse can be met only by advanced treatment. The traditional landfill leachate denitrification technology mainly comprises an A/O process, an oxidation ditch, SBR and the like. Although the A/O process has a single anoxic zone for denitrification and has a high denitrification rate, the denitrification rate is difficult to reach more than 90 percent due to the preposed denitrification; the oxidation ditch process is not very efficient either because it has no distinct nitrification and denitrification zones. The traditional SBR process generally adopts a post denitrification method to realize the deep denitrification of the percolate, but needs an additional carbon source and has high treatment cost.
Disclosure of Invention
The invention aims to provide a landfill leachate SBBR-SBR deep denitrification combined treatment process, which overcomes the defects of the conventional landfill leachate denitrification technology, realizes deep denitrification of landfill leachate and does not need to add any carbon source.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a landfill leachate SBBR-SBR deep denitrification combined treatment process comprises a Sequencing Batch Biofilm Reactor (SBBR) and two sequencing batch activated sludge reactors (SBR1 and SBR2), and comprises the following steps:
(1) the SBBR and SBR1 reactors are respectively filled with sewage to be treated, anaerobic stirring is carried out after the SBBR enters water, and aeration nitrification is carried out after the SBR1 reactor enters water;
(2) after the anaerobic stirring in the SBBR in the step (1) is finished, all the activated sludge in the SBBR is injected into an SBR2 reactor, and aeration nitrification is carried out in an SBR2 reactor;
(3) after the SBBR discharges all the activated sludge into the SBR2 reactor in the step (2), the activated sludge after nitration of the SBR1 reactor is received, internal source denitrification is carried out by stirring, stirring is stopped after the internal source denitrification, and precipitation and drainage are carried out;
(4) after the SBBR drains water in the step (3), the SBBR re-feeds water to carry out anaerobic stirring, after the anaerobic stirring in the SBBR is finished, all the activated sludge in the SBBR is pumped into the SBR1 reactor to carry out aeration nitrification, after the activated sludge is completely discharged into the SBR1 reactor by the SBBR, the activated sludge after the nitrification in the SBR2 reactor is received, internal source denitrification is carried out through stirring, stirring is stopped after internal source denitrification, and precipitation drainage is carried out;
(5) and (4) after the SBBR drains, the SBBR re-enters water to carry out anaerobic stirring, and the roles of the SBR1 reactor and the SBR2 reactor are exchanged and are sequentially circulated.
Preferably, in the initial state, the water discharge ratio of the SBBR, the SBR1 reactor and the SBR2 reactor is 30 percent, the sludge concentration is 6-8g/L, and the filling ratio of the SBBR filler is 30 percent.
Preferably, the stirring time of the anaerobic stirring is 0.8-1.5h,
preferably, in the aeration nitration process, the dissolved oxygen is controlled to be 2-4 mg/L.
Preferably, during the aeration nitrification, the change of the pH and the dissolved oxygen of the SBR1/SBR2 reactor is detected, when the pH is changed from a descending inflection point to an ascending inflection point and the dissolved oxygen is greatly increased, the nitrification is finished, and the aeration is stopped.
Preferably, during the endogenous denitrification, the ORP value of the SBBR is observed to judge the endpoint of the endogenous denitrification, and when the ORP value drops greatly and is-300 mv-500 mv, the endogenous denitrification is finished.
The inventor of the invention finds out in the experimental process that: the denitrifying bacteria have the characteristic of storing carbon sources, namely, when the sewage is in an anaerobic state and contains a large amount of organic matters, the denitrifying bacteria can absorb and absorb the organic matters in the sewage into the body to form an internal carbon source; when the sewage contains no organic matter but nitrate nitrogen or nitrite nitrogen, the denitrifying bacteria can utilize internal carbon source stored in the body to make anoxic respiration to obtain energy, i.e. produce endogenous denitrification. Meanwhile, the denitrifying bacteria are facultative bacteria, which can breathe under aerobic or anoxic conditions, but can utilize oxygen as an electron donor to breathe under aerobic conditions, and consume carbon sources (in sewage or in vivo); in the middle and later half of the nitrification process, the organic matters in the sewage are almost completely consumed, and under the condition, the denitrifying bacteria can utilize oxygen to carry out endogenous respiration and consume internal carbon sources in the body. Therefore, if the endogenous denitrification effect is good, the respiration of the denitrifying bacteria in the aerobic stage needs to be reduced. When the nitrification is finished, the more the residual internal carbon source in the denitrifying bacteria is, the better the subsequent endogenous denitrification rate and effect are. Due to this, the invention adopts a method of SBBR combining two SBRs. When water is fed, organic matters in the sewage are adsorbed and absorbed by denitrifying bacteria on the filler and in the sludge. After the carbon source is absorbed, the activated sludge is pumped into SBR for aeration nitrification. The sludge on the SBBR filler does not participate in the aeration process, so that the internal carbon source is retained to the maximum extent. After SBR aeration is finished, activated sludge is returned to the SBBR for internal denitrification. By adopting the mode, the endogenous denitrification effect can be improved to the maximum extent, and the denitrification effect and the denitrification efficiency of the SBBR-SBR deep denitrification combined treatment process are improved.
The invention has the beneficial effects that: compared with the prior art, the landfill leachate SBBR-SBR deep denitrification combined treatment process is realized by a group of SBBR-SBR1-SBR2 reactors, sewage enters the SBBR, then the SBBR is stirred, filler and activated sludge begin to absorb carbon sources to form internal carbon sources, then the activated sludge in the SBBR is pumped into the SBR2 reactor to be aerated and nitrified, at the moment, the sludge after the nitrification of the SBR1 is pumped into the SBBR, then the SBBR is stirred to generate internal source denitrification, and as a large amount of internal carbon sources are adsorbed by a biological membrane in the filler at the last stage, the biological membrane is used for denitrification, and after the denitrification is finished, precipitation drainage is carried out to enter the next period, and the functions of the SBR1 and the SBR2 are exchanged; the deep denitrification of the landfill leachate is realized by the treatment process without adding any carbon source; because the biological filler in the SBBR adsorbs a large amount of internal carbon sources, the endogenous denitrification rate is high; because the nitrification process and the denitrification process are separated, the internal carbon source is not consumed in the aerobic stage, and the speed is much higher than that of the traditional endogenous denitrification; and finally, the total nitrogen of the effluent of the SBBR is lower than 50mg/L and directly reaches the national discharge standard of the landfill leachate.
Drawings
FIG. 1 is a flow chart of the SBBR-SBR deep denitrification combined treatment process of the invention;
FIG. 2 is a diagram showing denitrification effect in one cycle of the SBBR-SBR advanced denitrification combined treatment process of the present invention;
FIG. 3 shows the variation of SBBR substrates in one cycle of the present invention
FIG. 4 is a variation of the substrates of SBR2 in one cycle of the present invention;
Detailed Description
A landfill leachate SBBR-SBR deep denitrification combined treatment process comprises a Sequencing Batch Biofilm Reactor (SBBR) and two sequencing batch activated sludge reactors (SBR1 and SBR2), wherein the water discharge ratio of the SBBR, the SBR1 reactor and the SBR2 reactor is 30%, the sludge concentration is 6-8g/L, and the filling ratio of SBBR fillers is 30%; the SBBR-SBR advanced denitrification combined treatment process is adopted to treat the landfill leachate, the COD of the leachate is 3700mg/L +/-200 mg/L, and the ammonia nitrogen concentration of the leachate is 900mg/L +/-100 mg/L.
The treatment process comprises the following steps:
(1) the method comprises the following steps that sewage to be treated (namely landfill leachate) enters the SBBR and the SBR1 reactors respectively, anaerobic stirring is carried out after the SBBR enters water, the stirring time of the anaerobic stirring is 1h, and aeration nitrification is carried out after the SBR1 reactor enters water;
(2) after the anaerobic stirring in the SBBR in the step (1) is finished, all the activated sludge in the SBBR is injected into an SBR2 reactor, and aeration nitrification is carried out in an SBR2 reactor;
(3) after the SBBR discharges all the activated sludge into the SBR2 reactor in the step (2), the activated sludge after nitration of the SBR1 reactor is received, internal source denitrification is carried out by stirring, stirring is stopped after the internal source denitrification, and precipitation and drainage are carried out;
(4) after the SBBR drains water in the step (3), the SBBR re-feeds water to carry out anaerobic stirring, the stirring time of the anaerobic stirring is 1h, after the anaerobic stirring in the SBBR is finished, all the activated sludge in the SBBR is injected into the SBR1 reactor to carry out aeration nitrification, after the activated sludge is completely discharged into the SBR1 reactor by the SBBR, the activated sludge after the nitrification in the SBR2 reactor is received, internal source denitrification is carried out through stirring, stirring is stopped after the internal source denitrification, and precipitation and drainage are carried out;
(5) and (4) after the SBBR drains, the SBBR re-enters water to carry out anaerobic stirring, and the roles of the SBR1 reactor and the SBR2 reactor are exchanged and are sequentially circulated.
In the aeration nitration process, the dissolved oxygen is controlled to be 2-4 mg/L.
In the aeration nitrification process, the change of the pH value and the dissolved oxygen of the SBR1/SBR2 reactor is detected, when the pH value is at an inflection point from descending to ascending and the dissolved oxygen is greatly ascended, nitrification is finished, and aeration is stopped.
And in the endogenous denitrification process, observing the ORP value of the SBBR to judge the endpoint of the endogenous denitrification, and indicating that the endogenous denitrification is finished when the ORP value drops greatly and is-300 mv-500 mv.
And when the aeration nitrification process is finished and the water inlet stirring process or the endogenous denitrification process is not finished, the SBR reactor for aeration nitrification is only started to have a stirring function to wait for the completion of the reaction in the SBBR.
As can be seen from FIG. 1, the treatment period was 80 days. The invention has relatively stable removal rate of COD in the leachate, the COD in the effluent is always stabilized at 700mg/L +/-20 mg/L, and the removal rate of the COD is more than 85 percent. The method has very stable removal effect on ammonia nitrogen in the leachate, the concentration of the ammonia nitrogen in the effluent is lower than 5mg/L, and the removal rate is stabilized to be more than 99%. In the first 24 days of leachate treatment, the total nitrogen of the effluent is high and reaches 302mg/L at most, mainly because nitrifying bacteria and denitrifying bacteria are not enriched and only denitrification is carried out by preposed denitrification. Along with the continuous processing, the action of endogenous denitrification is continuously enhanced, the total nitrogen of effluent is continuously reduced, and the total nitrogen removal rate is continuously increased. By the 24 th day, the total nitrogen content of the effluent is lower than 40mg/L, and the removal rate of the total nitrogen reaches more than 95 percent. After that, the removal rate of the total nitrogen of the leachate is always very stable, and the total nitrogen of effluent is always lower than 40mg/L, which shows that the method has good denitrification effect on the leachate.
The change of the substrate in one cycle of the SBBR of the present invention is shown in FIG. 2. As can be seen from FIG. 2, in the anaerobic stirring stage after water feeding, the COD in the system was greatly reduced from 850mg/L after water feeding to 730mg/L after the stirring was completed. The main reason for the reduction of COD is the adsorption and absorption of carbon sources by the filler and suspended sludge. During the stirring period, no aeration and nitrification are carried out, so that ammonia nitrogen is not obviously changed. And then, the SBBR receives the mud-water mixture after the nitration of the SBR1 reactor, and starts endogenous denitrification. In the endogenous denitrification process, the COD and ammonia nitrogen concentration changes little, but the total nitrogen concentration is continuously reduced. After 12 hours of internal denitrification, the total nitrogen of the system is reduced to be within 40mg/L, and the system realizes deep denitrification of the leachate.
The matrix change in one cycle of SBR2 of the present invention is shown in FIG. 3. As can be seen from FIG. 3, the total reaction time was 5 hours. The change in COD during the reaction was very small, indicating that the anaerobic reaction of SBBR had absorbed COD completely from the system. Aeration is started immediately after SBR2 enters water, and ammonia nitrogen continuously descends subsequently. After 5 hours of reaction, the ammonia nitrogen concentration of the system is reduced to be within 5 mg/L. During the aeration process, the system also has a synchronous nitrification and denitrification process, so the total nitrogen of the system also has a tendency of decreasing along with the nitrification. By the end of aeration, the total nitrogen of the system had dropped to 186mg/L, with a total nitrogen removal of 43%.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A landfill leachate SBBR-SBR deep denitrification combined treatment process is characterized by comprising the following steps: the treatment process comprises a sequencing batch biofilm reactor SBBR, sequencing batch activated sludge reactors SBR1 and SBR2, and comprises the following steps:
(1) the SBBR and SBR1 reactors are respectively filled with sewage to be treated, anaerobic stirring is carried out after the SBBR enters water, and aeration nitrification is carried out after the SBR1 reactor enters water;
(2) after the anaerobic stirring in the SBBR in the step (1) is finished, all the activated sludge in the SBBR is injected into an SBR2 reactor, and aeration nitrification is carried out in an SBR2 reactor;
(3) after the SBBR discharges all the activated sludge into the SBR2 reactor in the step (2), the activated sludge after nitration of the SBR1 reactor is received, internal source denitrification is carried out by stirring, stirring is stopped after the internal source denitrification, and precipitation and drainage are carried out;
(4) after the SBBR drains water in the step (3), the SBBR re-feeds water to carry out anaerobic stirring, after the anaerobic stirring in the SBBR is finished, all the activated sludge in the SBBR is pumped into the SBR1 reactor to carry out aeration nitrification, after the activated sludge is completely discharged into the SBR1 reactor by the SBBR, the activated sludge after the nitrification in the SBR2 reactor is received, internal source denitrification is carried out through stirring, stirring is stopped after internal source denitrification, and precipitation drainage is carried out;
(5) and (4) after the SBBR drains, the SBBR re-enters water to carry out anaerobic stirring, and the roles of the SBR1 reactor and the SBR2 reactor are exchanged and are sequentially circulated.
2. The landfill leachate SBBR-SBR deep denitrification combined treatment process of claim 1, which is characterized in that: in the initial state, the drainage ratio of SBBR is 30%, the sludge concentration of the SBBR, the SBR1 reactor and the SBR2 reactor is 6-8g/L, and the filling ratio of SBBR filler is 30%.
3. The landfill leachate SBBR-SBR deep denitrification combined treatment process of claim 1, which is characterized in that: the stirring time of the anaerobic stirring is 0.8-1.5 h.
4. The landfill leachate SBBR-SBR deep denitrification combined treatment process of claim 1, which is characterized in that: in the aeration nitration process, the dissolved oxygen is controlled to be 2-4 mg/L.
5. The landfill leachate SBBR-SBR deep denitrification combined treatment process of claim 1, which is characterized in that: in the aeration nitrification process, the change of the pH value and the dissolved oxygen of the SBR1/SBR2 reactor is detected, when the pH value is at an inflection point from descending to ascending and the dissolved oxygen is greatly ascended, the aeration nitrification is finished, and the aeration is stopped.
6. The landfill leachate SBBR-SBR deep denitrification combined treatment process of claim 1, which is characterized in that: and in the endogenous denitrification process, observing the ORP value of the SBBR to judge the endpoint of the endogenous denitrification, and indicating that the endogenous denitrification is finished when the ORP value drops greatly and ranges from-300 mv to-500 mv.
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