CN114644398A - Garbage leachate collecting and processing system - Google Patents
Garbage leachate collecting and processing system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/40—Liquid flow rate
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Abstract
The invention relates to the technical field of landfill leachate treatment, in particular to a landfill leachate collection treatment system, which comprises: the vacuum collection unit is used for collecting the percolate in the refuse landfill; the collecting and detecting unit is used for carrying out corresponding parameter detection on various collected parameters of the percolate; the treatment unit is used for carrying out various biochemical and microbial treatments on the collected percolate; and the processing detection unit is used for carrying out relevant detection on various parameters of the percolate processed by the processing unit. And the central control unit is used for judging whether the system has faults or controlling a related device to adjust the flow according to the dissolved oxygen concentration detected by the collecting and detecting unit and the flow of the output percolate, judging whether the ammonia nitrogen conversion is finished according to the nitrogen content of the percolate detected by the processing and detecting unit and adjusting the rotating speed of the blower so as to change the concentration of the dissolved oxygen. The invention realizes the pretreatment of the percolate in the collection stage and improves the collection and treatment efficiency.
Description
Technical Field
The invention relates to the technical field of garbage leachate treatment, in particular to a garbage leachate collection and treatment system.
Background
The landfill leachate has complex components, contains toxic and harmful substances, and has the characteristics of heavy odor, strong corrosivity, serious environmental pollution, sanitation and the like. Most of the existing garbage transfer stations are discharged through a drainage open ditch, and volatile gas in garbage percolate contains toxic substances, so that the quality of the air environment in and around the garbage transfer stations is seriously influenced. The garbage transfer stations are old, garbage percolate is discharged at will under the condition that no collection measure is taken, so that garbage compression equipment is easily polluted and corroded, and serious secondary pollution is easily caused by sewage crossflow, bad environmental sanitation and mosquito and fly breeding in the garbage transfer stations; if leachate on the ground is permeated for a long time, the groundwater source can be polluted. The landfill leachate gravity collection system has the advantages of deep pipe ditch, complex excavation, large collection pipe diameter, high construction difficulty, need of heavy mechanical equipment and difficulty in maintenance and repair.
The leachate sewage of the refuse transfer station is generally brown to brown black, has similar properties with the leachate of a refuse landfill, has complex components and high pollutant concentration, emits extremely unpleasant odor, and has the characteristic of extremely unstable sewage quality.
Chinese patent publication No.: CN 205917126U. Discloses a garbage leachate collecting and treating system, which comprises a vacuum collecting subsystem and a leachate treating subsystem; the garbage leachate treatment subsystem comprises a leachate pretreatment mechanism, a hydrolysis acidification machine, an anaerobic reaction mechanism, an A/O mechanism, a membrane biological reaction mechanism, a membrane separation mechanism and a Fenton oxidation mechanism which are sequentially connected along the flowing direction of leachate. The system collects the percolate in a vacuum collection mode, can prevent the percolate from polluting garbage compression equipment and the surrounding environment, ensures the physical health of workers and reduces the labor capacity of the workers; the method for treating the landfill leachate by combining the traditional biochemical membrane method and the Fenton oxidation method can effectively reduce the treatment energy consumption, and the quality of the treated effluent can reach the primary standard of Integrated wastewater discharge Standard, so that the high-efficiency and harmless treatment of the landfill leachate is realized, and the environmental protection of a refuse transfer station is improved. Therefore, the garbage leachate collecting and treating system has the problems that the change of the concentration of the dissolved oxygen in the collecting process affects the vacuum environment and the collecting and treating efficiency is influenced.
Disclosure of Invention
Therefore, the invention provides a garbage leachate collecting and treating system which is used for overcoming the influence of the change of the concentration of dissolved oxygen on the vacuum environment and the influence on the collecting and treating efficiency in the collecting process in the prior art.
In order to achieve the above object, the present invention provides a garbage leachate collection and treatment system, comprising: the vacuum collection unit is used for collecting the percolate in the refuse landfill; the collection detection unit is connected with the vacuum collection unit and is used for carrying out corresponding parameter detection on various collected parameters of the percolate; the processing unit is connected with the collecting and detecting unit and is used for carrying out various biochemical and microbial treatments on the collected percolate; the processing detection unit is connected with the processing unit and is used for detecting various parameters of the percolate processed by the processing unit; and the central control unit is respectively connected with the vacuum collection unit, the collection detection unit, the treatment unit and the treatment detection unit, and is used for judging whether a system has faults or controlling to adjust the flow of a vacuum collection device or a sewage pump according to the concentration of the dissolved oxygen detected by the collection detection unit and the flow of the output percolate, and judging whether ammonia nitrogen conversion is finished according to the nitrogen content of the percolate detected by the treatment detection unit and adjusting the rotating speed of a blower so as to change the concentration of the dissolved oxygen.
Furthermore, a preset dissolved oxygen concentration D0 is arranged in the central control unit, when the central control unit determines that the dissolved oxygen concentration exceeds the preset dissolved oxygen concentration D0, the central control unit adjusts the flow ratio of the air supply and the liquid supply according to the comparison result of the actual dissolved oxygen concentration and the preset dissolved oxygen concentration of the landfill leachate conveyed to the vacuum collection tank,
if D is less than D0, the central control unit judges that the flow ratio of air supply and liquid supply does not meet the requirement, and controls the sewage pump to reduce the conveying flow of the percolate to the treatment unit and increase the air supply flow;
if D is more than D0, the central control unit judges that the flow ratio of the air supply and the liquid supply meets the requirement, and controls the sewage pump to increase the conveying flow of the percolate to the treatment unit and simultaneously reduce the air supply flow.
Further, in the process of adjusting the flow ratio of air supply and liquid supply, the central control unit is provided with a preset critical flow ratio interval [ K1, K2], [ K2, K3] and [ K3, K4], wherein K1 is more than 0 and less than K2 and less than 1 and less than K3 and less than K4, the central control unit judges whether to adjust the flow of the percolate output by the vacuum collection device according to the actual interval where the adjusted flow ratio K is located, and the flow ratio K = air supply flow/liquid supply flow is set,
if K belongs to [ K1, K2], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and reduces the output percolate flow of the vacuum collection device;
if K belongs to [ K2, K3], the central control unit judges that the actual flow ratio meets the requirement, and does not adjust the flow of the output percolate of the vacuum collection device;
and if K belongs to the [ K3, K4], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and increases the output percolate flow to the vacuum collection device.
Further, when the central control unit judges that the flow of the percolate output by the vacuum collection device needs to be regulated, the central control unit judges whether the percolate collection device has a problem or not according to the deviation of the actual flow value Q and the preset flow value Q0,
if Q is larger than or equal to Q0, the central control unit judges that the system operates normally;
if Q < Q0, the central control unit determines that there is a possible fault problem with the system leachate collection device and calculates the flow rate difference to determine the specific fault type.
Further, the central control unit is provided with a first preset flow difference delta Q1 and a second preset flow difference delta Q2, when Q is less than Q0, the central control unit judges the problem in the pipeline according to the section where the actual flow difference is located, the actual flow difference delta Q = Q0-Q, 0 < deltaQ 1 < deltaQ 2 is set,
if the delta Q is less than or equal to the delta Q1, the central control unit judges that no fault problem exists in the pipeline;
if the delta Q is more than delta Q1 and less than or equal to delta Q2, the central control unit preliminarily judges that a problem exists in the pipeline and controls the dissolved oxygen concentration sensor to detect the dissolved oxygen concentration so as to search the cause of the problem;
if DeltaQ >. DeltaQ 2, the central control unit preliminarily judges that a problem exists in the pipeline and adjusts the preset flow value Q0 to find the cause of the problem.
Further, when the central control unit preliminarily judges that a problem exists in the pipeline and controls the dissolved oxygen concentration sensor to detect the dissolved oxygen concentration so as to search the reason, the central control unit determines the fault reason according to the comparison result of the dissolved oxygen concentration and the preset dissolved oxygen concentration,
if D is larger than D0, the central control unit judges that the vacuum collection conveying device is blocked and sends out a blockage alarm;
if D is less than D0, the central control unit judges that the gas-water separation degree is better and does not give out corresponding alarm.
Further, when the central control unit preliminarily determines that a problem exists in the pipeline and adjusts the preset flow value Q0 to find a cause of the problem, the central control unit correspondingly selects a flow adjustment coefficient to adjust the preset flow value Q0 according to an interval where the actual flow Q is located, wherein the central control unit is provided with a preset first standard flow Q1, a preset second standard flow Q2, a preset third standard flow Q3, a preset first flow adjustment coefficient α 1 and a preset second flow adjustment coefficient α 2, wherein α 1 is greater than 0 and less than α 2, Q1 is greater than 0 and less than Q2,
if Q ∈ [0, Q1], the central control unit controls to reduce the flow rate output by the vacuum collection device, and records the adjusted flow rate as Q', and sets Q = Q0 × α 1;
if Q belongs to [ Q1, Q2], the central control unit judges that the interval meets the requirement and does not adjust the flow output by the vacuum collection device;
and if Q ∈ [ Q2, Q3], the control unit controls to increase the flow rate output by the vacuum collection device, and sets Q ″ = Q0 × α 2, assuming that the adjusted flow rate is Q ″.
Further, when the preset flow value is adjusted, the central control unit records the adjusted preset standard flow as Q0 ', and controls the liquid flowmeter to detect the adjusted actual flow Q',
if Q ' is less than Q0 ' and delta Q1 ' is less than delta Q2, the central control unit judges that the internal pressure of the vacuum collection tank is too low to cause dissolved oxygen separation, and controls the air supply port to increase the air supply flow;
if Q ' is < Q0 ' and Δ Q ' is > - Δ Q2, the central control unit determines that the pipe of the vacuum collection system is blocked,
the central control unit sends out a blockage alarm;
if Q 'is < Q0' and Δ Q ≦ Δ Q1, the central control unit determines that there is no fault, the central control unit does not regulate the flow and does not issue an alarm.
Further, the central control unit is also used for controlling the ammonia nitrogen sensor to detect the nitrogen content of the landfill leachate before entering the A/O mechanism and after being processed by the A/O mechanism, setting the content of liquid nitrogen of the landfill leachate before entering the A/O mechanism to be N1, setting the nitrogen content of the landfill leachate after being processed by the A/O mechanism to be N2, judging whether the ammonia nitrogen conversion is finished or not according to the comparison result of N1 and N2,
if N1 is more than 100 XN 2, the central control unit preliminarily judges that the ammonia nitrogen conversion is finished, and controls the vacuum collection unit to not change the air supply quantity and the liquid supply quantity at the vacuum collection pool;
if N1 is less than N2, the central control unit judges that the ammonia nitrogen conversion is not finished and gives out a machine fault alarm.
Further, when the intermediate control unit preliminarily judges that the ammonia nitrogen conversion is finished, the intermediate control unit further judges whether the ammonia nitrogen conversion is finished according to a comparison result of a difference value between the N1 and the N2 and a preset nitrogen content difference value, sets N = N1-N2, wherein the intermediate control unit is provided with a preset first nitrogen content difference value N1, a preset second nitrogen content difference value N2, a first preset blower rotating speed adjusting coefficient beta 1 and a second preset blower rotating speed adjusting coefficient beta 2, wherein N1 is less than N2, 1 < beta 2,
if the Δ N is less than N1, the middle control unit judges that the ammonia nitrogen conversion is finished;
if the Δ N1 is less than N > -N2, the central control unit judges that the ammonia nitrogen conversion is not finished, selects a first blower rotating speed adjusting coefficient beta 1 to adjust the rotating speed of the blower, and sets the adjusted rotating speed of the blower as V.prime.V.beta.1;
if Δ N >. N2, the central control unit judges that ammonia nitrogen conversion is unfinished and controls the blower to adjust the rotating speed of the blower, and the adjusted rotating speed of the blower is recorded as V' and V.beta.2 is set.
Compared with the prior art, the garbage leachate treatment system has the advantages that the vacuum collection unit, the collection detection unit, the treatment detection unit and the central control unit are arranged, the collection unit and the treatment unit form a linkage system, the treatment efficiency of the subsequent treatment process can be obviously improved by detecting and adjusting the relevant dissolved oxygen concentration of the collection module, and zero treatment of the garbage leachate in the vacuum collection stage and improvement of the collection treatment efficiency are realized.
Furthermore, the system of the invention can adjust the flow ratio of the air supply and the liquid supply according to the preset dissolved oxygen concentration by setting the preset dissolved oxygen concentration, thereby realizing zero treatment of the landfill leachate in the vacuum collection stage and improving the collection treatment efficiency.
Furthermore, the system of the invention can judge whether to adjust the flow of the percolate output by the vacuum collection device according to the actual interval of the adjusted flow ratio by setting the preset critical flow ratio interval, thereby further realizing zero treatment of the landfill percolate at the vacuum collection stage and improving the collection treatment efficiency.
Furthermore, the system can judge whether the leachate collecting device has problems by setting the flow of the preset output leachate, further realizes zero treatment of the landfill leachate in a vacuum collecting stage and improves the collecting and treating efficiency.
Furthermore, the system of the invention can judge the problems in the pipeline according to the section of the actual difference value by setting the first preset flow difference value and the second preset flow difference value, thereby further realizing zero treatment of the landfill leachate in the vacuum collection stage and improving the collection treatment efficiency.
Furthermore, the system of the invention can realize that the central control unit controls the dissolved oxygen concentration sensor to detect the dissolved oxygen concentration so as to search the reason and send out corresponding prompt alarm by setting the preset standard dissolved oxygen concentration, thereby further realizing the zero treatment of the garbage percolate in the vacuum collection stage and improving the collection treatment efficiency.
In a further aspect, the system provided by the invention can adjust the preset flow value by using the adjustment coefficient according to the section of the actual flow through setting the preset first standard flow, the preset second standard flow, the preset third standard flow, the preset first flow adjustment coefficient and the preset second flow adjustment coefficient, so that zero treatment of the landfill leachate in the vacuum collection stage is further realized and the collection treatment efficiency is improved.
Furthermore, after the system of the invention adjusts the preset flow, the central control unit controls the liquid flowmeter to detect the adjusted actual flow and accordingly judges whether the system has a fault or needs to make corresponding adjustment, thereby further realizing zero treatment of the landfill leachate in a vacuum collection stage and improving the collection treatment efficiency.
Furthermore, the system can judge the degree and completion of ammonia nitrogen conversion according to the change of the nitrogen content by setting the preset nitrogen content, thereby further realizing zero treatment of the landfill leachate in a vacuum collection stage and improving the collection treatment efficiency.
Furthermore, the system can judge the ammonia nitrogen conversion degree and control the air blower to adjust the dissolved oxygen concentration by setting the preset first nitrogen content difference value, the preset second nitrogen content difference value, the first preset air blower rotating speed adjusting coefficient and the second preset air blower rotating speed adjusting coefficient, so that zero treatment of the garbage percolate in the vacuum collection stage is further realized, and the collection treatment efficiency is improved.
Drawings
Fig. 1 is a block diagram of a landfill leachate collection and treatment system according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a landfill leachate collecting and treating system includes:
the vacuum collection unit 9 is used for collecting the percolate in the refuse landfill;
the collection detection unit is connected with the vacuum collection unit 9 and is used for carrying out corresponding parameter detection on various collected parameters of the percolate;
the processing unit 8 is connected with the collecting and detecting unit and is used for carrying out various biochemical and microbial treatments on the collected percolate;
the processing detection unit is connected with the processing unit and is used for detecting various parameters of the percolate processed by the processing unit;
and the central control unit is respectively connected with the vacuum collection unit, the collection detection unit, the treatment unit and the treatment detection unit, and is used for judging whether a system has faults or controlling to adjust the flow of the vacuum collection device 1 or the sewage pump 4 according to the dissolved oxygen concentration detected by the collection detection unit and the flow of the output percolate, and judging whether ammonia nitrogen conversion is finished according to the nitrogen content of the percolate detected by the treatment detection unit and adjusting the rotating speed of the blower 10 so as to change the concentration of the dissolved oxygen.
Referring to fig. 1, the central control unit is provided with a preset dissolved oxygen concentration D0, and when the central control unit determines that the dissolved oxygen concentration exceeds the preset dissolved oxygen concentration D0, the central control unit adjusts the flow ratio of the gas and the liquid according to the comparison result between the actual dissolved oxygen concentration and the preset dissolved oxygen concentration of the landfill leachate delivered to the vacuum collection tank 2,
if D is less than D0, the central control unit judges that the flow ratio of the air supply and the liquid supply does not meet the requirement, and controls the sewage pump 4 to reduce the conveying flow of the percolate to the treatment unit and increase the air supply flow;
if D is more than D0, the central control unit judges that the flow ratio of air supply and liquid supply meets the requirement, and controls the sewage pump 4 to increase the conveying flow of the percolate to the treatment unit and simultaneously reduce the air supply flow.
As shown in fig. 1, in the process of adjusting the flow ratio of the air supply and the liquid supply, the central control unit is provided with a preset critical flow ratio interval [ K1, K2], [ K2, K3] and [ K3, K4], wherein 0 < K1 < K2 < 1 < K3 < K4, the central control unit determines whether to adjust the flow of the leachate output by the vacuum collection device 1 according to the actual interval of the adjusted flow ratio K, and sets the flow ratio K = air supply flow/liquid supply flow,
if K belongs to [ K1, K2], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and reduces the output percolate flow of the vacuum collection device;
if K belongs to [ K2, K3], the central control unit judges that the actual flow ratio meets the requirement, and the central control unit does not adjust the flow of the output percolate of the vacuum collection device;
and if K belongs to the [ K3, K4], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and increases the output percolate flow to the vacuum collection device.
With reference to fig. 1, when the central control unit determines that the flow rate of the leachate outputted from the vacuum collection device needs to be adjusted, the central control unit determines whether the leachate collection device has a problem according to the deviation between the actual flow rate Q and the preset flow rate Q0,
if Q is larger than or equal to Q0, the central control unit judges that the system operates normally;
if Q < Q0, the central control unit determines that there is a possible failure problem in the system leachate collecting device and calculates the flow difference to determine the specific failure type.
Continuing to refer to fig. 1, the central control unit is provided with a first preset flow rate difference Δ Q1 and a second preset flow rate difference Δ Q2, when Q is less than Q0, the central control unit determines the problem in the pipeline according to the section where the actual flow rate difference is located, sets the actual flow rate difference Δ Q = Q0-Q, 0 < [ delta ] Q1 < [ delta ] Q2,
if the delta Q is less than or equal to the delta Q1, the central control unit judges that no fault problem exists in the pipeline;
if the delta Q is more than delta Q1 and less than or equal to delta Q2, the central control unit preliminarily judges that a problem exists in the pipeline and controls the dissolved oxygen concentration sensor 3 to detect the dissolved oxygen concentration so as to search the cause of the problem;
if delta Q > -delta Q2, the central control unit preliminarily judges that a problem exists in the pipeline and adjusts the preset flow rate value Q0 to find the cause of the problem.
Referring to fig. 1, when the central control unit preliminarily determines that there is a problem in the pipeline and controls the dissolved oxygen concentration sensor to detect the dissolved oxygen concentration to find the cause, the central control unit determines the cause of the fault according to the comparison result between the dissolved oxygen concentration and the preset dissolved oxygen concentration,
if D is larger than D0, the central control unit judges that the vacuum collection conveying device is blocked and sends out a blockage alarm;
if D is less than D0, the central control unit judges that the gas-water separation degree is better and does not give out corresponding alarm.
As shown in fig. 1, when the central control unit preliminarily determines that there is a problem in the pipeline and adjusts the preset flow value Q0 to find the cause of the problem, the central control unit correspondingly selects a flow adjustment coefficient to adjust the preset flow value Q0 according to the interval where the actual flow Q is located, wherein the central control unit is provided with a preset first standard flow Q1, a preset second standard flow Q2, a preset third standard flow Q3, a preset first flow adjustment coefficient α 1 and a preset second flow adjustment coefficient α 2, where α 1 is greater than 0 and less than α 2, Q1 is greater than 0 and less than Q2,
if Q ∈ [0, Q1], the central control unit controls to reduce the flow rate output by the vacuum collection device, and records the adjusted flow rate as Q', and sets Q = Q0 × α 1;
if Q belongs to the group of [ Q1, Q2], the central control unit judges that the interval meets the requirement and does not adjust the flow output by the vacuum collection device;
and if Q ∈ [ Q2, Q3], the control unit controls to increase the flow rate output by the vacuum collection device, and sets Q ″ = Q0 × α 2, assuming that the adjusted flow rate is Q ″.
Continuing to refer to fig. 1, when the preset flow value is adjusted, the central control unit records the adjusted preset standard flow as Q0 ', and controls the liquid flowmeter to detect the adjusted actual flow Q' ″,
if Q ' is less than Q0 ' and delta Q1 ' is less than delta Q2, the central control unit judges that the internal pressure of the vacuum collection tank is too low to cause dissolved oxygen separation, and controls the air supply port to increase the air supply flow;
if Q ' is < Q0 ' and Δ Q ' is > - Δ Q2, the central control unit determines that the pipe of the vacuum collection system is blocked,
the central control unit sends out a blockage alarm;
if Q 'is less than Q0' and Δ Q ≦ Δ Q1, the central control unit determines that there is no fault, and the central control unit does not regulate the flow and does not issue an alarm.
Continuing to refer to fig. 1, the central control unit controls the ammonia nitrogen sensor 6 to detect the nitrogen content of the landfill leachate before entering the a/O mechanism 5 and after being processed by the a/O mechanism 5, sets the nitrogen content of the landfill leachate before entering the a/O mechanism to be N1, sets the nitrogen content of the landfill leachate after being processed by the a/O mechanism to be N2, determines whether the ammonia nitrogen conversion is completed according to the comparison result between N1 and N2,
if N1 is more than 100 XN 2, the central control unit preliminarily judges that the ammonia nitrogen conversion is finished, and controls the vacuum collection unit to not change the air supply quantity and the liquid supply quantity at the vacuum collection pool;
if N1 is less than N2, the central control unit judges that the ammonia nitrogen conversion is not finished and gives out a machine fault alarm.
Please continue to refer to fig. 1, when the central control unit preliminarily determines that the ammonia nitrogen conversion is completed, the central control unit further determines whether the ammonia nitrogen conversion is completed according to a comparison result of a difference between the N1 and the N2 and a preset nitrogen content difference, sets Δ N = N1-N2, wherein the central control unit is provided with a preset first nitrogen content difference N1, a preset second nitrogen content difference N2, a first preset blower speed adjustment coefficient β 1 and a second preset blower speed adjustment coefficient β 2, wherein 0 < N1 < N2, 1 < β 2, the blower 10 is arranged in the ammonia nitrogen conversion unit 7,
if the Δ N is less than N1, the middle control unit judges that the ammonia nitrogen conversion is finished;
if the Δ N1 is less than N > -N2, the central control unit judges that the ammonia nitrogen conversion is not finished, selects a first blower rotating speed adjusting coefficient beta 1 to adjust the rotating speed of the blower, and sets the adjusted rotating speed of the blower as V.prime.V.beta.1;
if Δ N >. N2, the central control unit judges that ammonia nitrogen conversion is unfinished and controls the blower to adjust the rotating speed of the blower, and the adjusted rotating speed of the blower is recorded as V' and V.beta.2 is set.
Referring to fig. 1, when the pressure in the collection unit is decreased, the solubility of the gas is decreased, which causes bubbles in the leachate, and thus the vacuum environment is impure, or the actual delivery flow deviates from the expected delivery flow to affect the collection efficiency.
With continued reference to fig. 1, when the collecting unit collects the landfill leachate, the concentration of the dissolved oxygen is monitored during the collecting process, so as to achieve the pretreatment process of the leachate, and further improve the reaction efficiency of the leachate in the anaerobic reactor.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A landfill leachate collection treatment system, comprising:
the vacuum collection unit is used for collecting the percolate in the refuse landfill;
the collection detection unit is connected with the vacuum collection unit and is used for carrying out corresponding parameter detection on various collected parameters of the percolate;
the processing unit is connected with the collecting and detecting unit and is used for carrying out various biochemical and microbial treatments on the collected percolate;
the processing detection unit is connected with the processing unit and is used for detecting various parameters of the percolate processed by the processing unit;
and the central control unit is respectively connected with the vacuum collection unit, the collection detection unit, the treatment unit and the treatment detection unit, and is used for judging whether a system has faults or controlling the flow of the vacuum collection device or the sewage pump according to the concentration of the dissolved oxygen detected by the collection detection unit and the flow of the output percolate so as to regulate the flow of the vacuum collection device or the sewage pump, and judging whether ammonia nitrogen conversion is finished according to the nitrogen content of the percolate detected by the treatment detection unit and regulating the rotating speed of the blower so as to change the concentration of the dissolved oxygen.
2. The landfill leachate collection and treatment system of claim 1, wherein the central control unit is provided with a predetermined dissolved oxygen concentration D0, and when the central control unit determines that the dissolved oxygen concentration exceeds the predetermined dissolved oxygen concentration D0, the central control unit adjusts the flow ratio of the gas supply and the liquid supply according to the comparison result between the actual dissolved oxygen concentration of the landfill leachate supplied to the vacuum collection tank and the predetermined dissolved oxygen concentration,
if D is less than D0, the central control unit judges that the flow ratio of air supply and liquid supply does not meet the requirement, and controls the sewage pump to reduce the conveying flow of the percolate to the treatment unit and increase the air supply flow;
if D is more than D0, the central control unit judges that the flow ratio of the air supply and the liquid supply meets the requirement, and controls the sewage pump to increase the conveying flow of the percolate to the treatment unit and simultaneously reduce the air supply flow.
3. The landfill leachate collecting and processing system of claim 2, wherein during the adjustment of the flow ratio for the supply air and the supply liquid, the central control unit is provided with preset critical flow ratio intervals [ K1, K2], [ K2, K3] and [ K3, K4], wherein 0 < K1 < K2 < 1 < K3 < K4, the central control unit determines whether to adjust the flow of the leachate output by the vacuum collection device according to the actual interval where the adjusted flow ratio K is located, and sets the flow ratio K = supply air flow/supply liquid flow,
if K belongs to [ K1, K2], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and reduces the output percolate flow of the vacuum collection device;
if K belongs to [ K2, K3], the central control unit judges that the actual flow ratio meets the requirement, and does not adjust the flow of the output percolate of the vacuum collection device;
and if K belongs to the [ K3, K4], the central control unit judges that the actual flow ratio does not meet the requirement, and the central control unit controls and increases the output percolate flow 3 of the vacuum collection device.
4. The landfill leachate collection and treatment system of claim 3, wherein when the central control unit determines that the flow rate of the leachate output by the vacuum collection device needs to be adjusted, the central control unit determines whether the leachate collection device has a problem according to the deviation between the actual flow rate Q and the preset flow rate Q0,
if Q is larger than or equal to Q0, the central control unit judges that the system operates normally;
if Q < Q0, the central control unit determines that there is a possible failure problem in the system leachate collecting device and calculates the flow difference to determine the specific failure type.
5. The landfill leachate collecting and processing system of claim 4, wherein the central control unit is provided with a first preset flow rate difference Δ Q1, a second preset flow rate difference Δ Q2, when Q < Q0, the central control unit determines the problem in the pipeline according to the section where the actual flow rate difference is located, the actual flow rate difference Δ Q = Q0-Q, 0 < [ delta ] Q1 < [ delta ] Q2 is set,
if the delta Q is less than or equal to the delta Q1, the central control unit judges that no fault problem exists in the pipeline;
if the delta Q is more than delta Q1 and less than or equal to delta Q2, the central control unit preliminarily judges that a problem exists in the pipeline and controls the dissolved oxygen concentration sensor to detect the dissolved oxygen concentration so as to search the cause of the problem;
if DeltaQ >. DeltaQ 2, the central control unit preliminarily judges that a problem exists in the pipeline and adjusts the preset flow value Q0 to find the cause of the problem.
6. The landfill leachate collection and treatment system of claim 5, wherein the central control unit determines the cause of the fault according to the comparison result between the dissolved oxygen concentration and the preset dissolved oxygen concentration when it is determined that there is a problem in the pipeline initially and the dissolved oxygen concentration sensor is controlled to detect the dissolved oxygen concentration for finding the cause,
if D is larger than D0, the central control unit judges that the vacuum collection conveying device is blocked and sends out a blockage alarm;
if D is less than D0, the central control unit judges that the gas-water separation degree is better and does not give out corresponding alarm.
7. The landfill leachate collecting and processing system of claim 5, wherein when the central control unit preliminarily determines that there is a problem in the pipeline and adjusts the preset flow value Q0 to find the cause of the problem, the central control unit correspondingly selects a flow regulating coefficient to adjust the preset flow value Q0 according to the interval where the actual flow Q is located, wherein the central control unit is provided with a preset first standard flow Q1, a preset second standard flow Q2, a preset third standard flow Q3, a preset first flow regulating coefficient α 1 and a preset second flow regulating coefficient α 2, wherein α 1 is greater than 0 and less than α 2, Q1 is greater than 0 and less than Q2,
if Q ∈ [0, Q1], the central control unit controls to reduce the flow rate output by the vacuum collection device, and records the adjusted flow rate as Q', and sets Q = Q0 × α 1;
if Q belongs to [ Q1, Q2], the central control unit judges that the interval meets the requirement and does not adjust the flow output by the vacuum collection device;
and if Q ∈ [ Q2, Q3], the control unit controls to increase the flow rate output by the vacuum collection device, and sets Q ″ = Q0 × α 2, assuming that the adjusted flow rate is Q ″.
8. The landfill leachate collection and treatment system of claim 7, wherein the central control unit records the adjusted preset standard flow as Q0 'when the preset flow value is adjusted, and controls the liquid flowmeter to detect the adjusted actual flow Q',
if Q ' is less than Q0 ' and delta Q1 ' is less than delta Q2, the central control unit judges that the internal pressure of the vacuum collection tank is too low to cause dissolved oxygen separation, and controls the air supply port to increase the air supply flow;
if Q ' is < Q0 ' and Δ Q ' is > - Δ Q2, the central control unit determines that the pipe of the vacuum collection system is blocked,
the central control unit sends out a blockage alarm;
if Q 'is < Q0' and Δ Q ≦ Δ Q1, the central control unit determines that there is no fault, the central control unit does not regulate the flow and does not issue an alarm.
9. The landfill leachate collection and treatment system of claim 1, wherein the central control unit is further configured to control the ammonia nitrogen sensor to detect the nitrogen content of the landfill leachate before entering the A/O mechanism and after being treated by the A/O mechanism, set the nitrogen content of the landfill leachate before entering the A/O mechanism to be N1, set the nitrogen content of the landfill leachate after being treated by the A/O mechanism to be N2, and determine whether the ammonia nitrogen conversion is completed according to the comparison result between N1 and N2,
if N1 is more than 100 XN 2, the central control unit preliminarily judges that the ammonia nitrogen conversion is finished, and controls the vacuum collection unit to not change the air supply quantity and the liquid supply quantity at the vacuum collection pool;
if N1 is less than N2, the central control unit judges that the ammonia nitrogen conversion is not finished and gives out a machine fault alarm.
10. The landfill leachate collecting and treating system of claim 9, wherein the central control unit further determines whether the ammonia nitrogen conversion is completed according to a comparison result of a difference between the N1 and the N2 and a preset nitrogen content difference when the primary determination of the ammonia nitrogen conversion is completed, sets a preset first nitrogen content difference N = N1-N2, wherein the central control unit is provided with a preset first nitrogen content difference N1, a preset second nitrogen content difference N2, a first preset blower speed adjustment coefficient β 1 and a second preset blower speed adjustment coefficient β 2, wherein 0 < N1 < N2, 1 < β 2,
if the Δ N is less than N1, the middle control unit judges that the ammonia nitrogen conversion is finished;
if the Δ N1 is less than N > -N2, the central control unit judges that the ammonia nitrogen conversion is not finished, selects a first blower rotating speed adjusting coefficient beta 1 to adjust the rotating speed of the blower, and sets the adjusted rotating speed of the blower as V.prime.V.beta.1;
if Δ N >. N2, the central control unit judges that ammonia nitrogen conversion is unfinished and controls the blower to adjust the rotating speed of the blower, and the adjusted rotating speed of the blower is recorded as V' and V.beta.2 is set.
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