CN111115964B - Wastewater anaerobic biological treatment system for seasonal strain preservation and recovery and application thereof - Google Patents
Wastewater anaerobic biological treatment system for seasonal strain preservation and recovery and application thereof 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
- C02F3/006—Regulation methods for biological 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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/02—Temperature
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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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/42—Liquid level
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Abstract
The anaerobic biological treatment system for waste water for seasonal strain preservation and recovery includes water inlet device for inputting waste water to be treated; the anaerobic biological treatment device is used for anaerobic biological treatment of wastewater to be treated; a subsequent treatment device for further treating the wastewater passing through the anaerobic biological treatment device; the device comprises a monitoring device, a control device and a control device, wherein the monitoring device is used for monitoring and outputting parameters of mixed liquor in the anaerobic biological treatment device, and the control device is used for controlling a servo component in the anaerobic biological treatment device based on signals which are output by the monitoring device and contain parameter values, so that corresponding parameters are adjusted. The process reactor has the advantages of simple structure, convenient maintenance, simple operation logic, simple operation and maintenance, less manual requirements and easy realization of automatic control.
Description
Technical Field
The invention belongs to the technical field of sewage biological treatment, and particularly relates to a wastewater anaerobic biological treatment system for seasonal strain preservation and recovery and application thereof.
Background
Anaerobic digestion can effectively realize synchronous recovery of energy and pollutant removal from high-concentration organic wastewater, is a green sewage recycling technology, and has great potential in the fields of high-concentration organic wastewater treatment and recycling. Industrial wastewater discharge formed by huge industrial volume in China is increasingly and widely focused by the public along with rapid improvement of the online continuous monitoring capability of pollution sources; the seasonal intermittent sewage discharge sources formed by raw material limitation in the agricultural and sideline food processing industry and the like are recently accelerated to be incorporated into a discharge supervision and pollution discharge license management system, and the requirements for stable standard reaching of the seasonal intermittent sewage are rapidly improved. Meanwhile, the continuous extension and interdependence of macroscopic economic development such as industrial chain, periodic surplus local productivity and the like and the pain in the upgrading of the industrial chain also make the problem of intermittent discharge of industrial wastewater increasingly prominent, directly influence the stable standard-reaching discharge of a wastewater treatment system and the supervision of environmental regulations, and make the stable standard-reaching of seasonal intermittent discharge wastewater not only be the local problem of the wastewater of the traditional agriculture and sideline food processing industry, but also become the global environmental constraint problem for restricting the development of industry. Rapid changes in environmental and industrial settings create a great challenge for the conservation of species in seasonal wastewater anaerobic biological treatment devices. Anaerobic digestion is a potential sewage biological treatment technology, and is different from a normal operation stage, and an important target of anaerobic biological treatment in a seasonal wastewater intermittent discharge stage is bacterial conservation rather than standard treatment and sludge reduction, so that the anaerobic digestion can be rapidly adapted to the change of environment and industrial situation, and is a key technology for stabilizing and reaching standards of seasonal wastewater intermittent discharge.
The strain preservation stage is different from the process target of the standard operation stage, and the operation strategy of the strain preservation stage is needed to be optimized aiming at the strain preservation target. Standard operation technology aiming at stable standard and efficient pollutant removal has definite operation strategy and experience value in sewage treatment, but is still unclear in a strain preservation stage, and continuous operation of a seasonal intermittent drainage sewage treatment system is affected, so that the problems of system breakdown, re-inoculation, reduction of standard rate and the like are caused. The sludge proliferation curve in the sewage degradation process is divided into four periods: the lag phase (adaptation phase), log-proliferation phase, meiosis proliferation phase (stationary phase) and endogenous respiration phase (decay phase) are represented by corresponding kinetic phases: a hysteresis phase, a zero-order reaction phase, a first-order reaction phase and a difficult degradation substrate speed limiting phase. In general, seasonal wastewater adopts a long-term low-load strategy to maintain the system operation, so that anaerobic sludge is in an endogenous respiration period for a long time, a large number of anaerobic bacteria are inevitably dormant and decayed, and bacterial species cannot be preserved. According to the four-stage characteristics of the total amount change of anaerobic microorganisms, if the water inflow load of the system can be properly controlled, the intermittent water inflow gives impact load, and the strain is intermittently preserved in the proliferation period-the endogenous respiration period alternately, so that the anaerobic sludge is prevented from continuously dying in the endogenous respiration period for a long time, the strain of the anaerobic biological treatment device for seasonal wastewater can be effectively preserved, and the continuous and stable operation of the anaerobic biological treatment device for seasonal wastewater is realized.
The influent load can effectively control the kinetic phase of anaerobic digestion. The difficulty of seasonal intermittent wastewater load control is that the total load is limited by the water inflow and is difficult to maintain in the anaerobic microorganism proliferation period. For example, the anaerobic reactor operating load during normal operation in the anaerobic sludge proliferation phase should be stabilized at (1-8 kg COD m -3d-1), but the insufficient load during intermittent discharge causes the anaerobic bacteria species to decay in the endogenous respiration phase. Prior studies have shown that this kinetic process is affected by the load of the incoming water, including: water inflow, COD of inflow, inflow strategy, etc. Wherein, the COD of the inflow water is higher in difficulty and cost depending on the condition of the inflow water; the water inflow is greatly influenced by the water inflow condition, and certain adjustment can be performed in the operation range of the adjusting tank; if combined with a water inlet strategy, the regulation range and the regulation capability of the regulation range on the operation load and the dynamics stage can be further effectively expanded. Therefore, there is a need for research and patented methods for load control systems for intermittent wastewater anaerobic treatment influent strategies.
The dynamic stage of anaerobic digestion is judged according to the conventional online monitoring index, and the method is one of core technologies for intermittently improving the dynamic process of anaerobic digestion of seasonal intermittent wastewater to a proliferation stage in the anaerobic digestion process. Key reasons for low load of seasonal intermittent anaerobic wastewater treatment include ① that the quality of influent water fluctuates greatly and ② biomass is low. Due to insufficient load, the sludge concentration of seasonal intermittent wastewater in the off-production stage is often much lower than in the normal operation stage, resulting in maintaining a sufficient amount of anaerobic sludge as a key challenge for anaerobic treatment strain preservation: adequate load is difficult to achieve due to the limitation of water inflow, and too low load causes the sludge of the anaerobic system to enter the endogenous respiratory stage and decay. The strain decay causes difficult restarting of anaerobic treatment and reduced COD removal rate, and further treatment is required to reach the standard, thus preventing continuous operation of anaerobic treatment. Therefore, according to the requirements of the anaerobic treatment and the strain preservation of the seasonal wastewater, the water inflow control strategy suitable for the strain preservation has the following characteristics: the monitoring system is simple, the dynamic stage judgment is accurate, and the load control is accurate.
Disclosure of Invention
Accordingly, it is one of the primary objectives of the present invention to provide a wastewater anaerobic biological treatment system for seasonal strain conservation and application thereof, so as to at least partially solve at least one of the above-mentioned problems.
To achieve the above object, as one aspect of the present invention, there is provided a wastewater anaerobic biological treatment system for seasonal strain conservation recovery, comprising:
a water inlet device for inputting wastewater to be treated;
The anaerobic biological treatment device is used for anaerobic biological treatment of wastewater to be treated;
A subsequent treatment device for further treating the wastewater passing through the anaerobic biological treatment device;
a monitoring device for monitoring and outputting parameters of the mixed liquor in the anaerobic biological treatment device, and
And a control device for controlling a servo component in the anaerobic biological treatment device based on the signal containing the parameter value output by the monitoring device, so as to adjust the corresponding parameter.
As another aspect of the present invention, there is also provided a logic control unit for executing logic of:
when the daily accumulated gas yield or gas yield rate is reduced to be less than 1/3 of the normal operation value or the design value, judging that the wastewater treatment system enters a seasonal intermittent operation stage;
Starting water inflow when the gas production rate of the anaerobic biological treatment device is monitored to be less than 0.5-2.2 m 3CH4/m3 & d or less than 1/2-1/5 of the average value of the gas production rate of the day before the monitoring day;
Stopping water inflow when the pH of the mixed solution is monitored to be less than 6.9 to 7.3 or delta pH is monitored to be more than 0.2 to 0.7, wherein delta pH is the absolute value of pH change in unit time;
When the gas production rate of the anaerobic biological treatment device is monitored to be less than or equal to 0.05-1.5 m 3CH4/m3 & d, the water inflow is increased, the logic judgment of the gas production rate of the anaerobic biological treatment device is carried out again, when the liquid level value of the anaerobic biological treatment device is monitored to be greater than the liquid level protection value, the water level is reduced, and the intermittent operation stage is carried out;
When the gas production rate of the anaerobic biological treatment device is monitored to be more than 0.05 to 1.5m 3CH4/m3·d2, the cycle is ended, and the normal operation stage is returned.
As a further aspect of the present invention there is also provided the use of a wastewater anaerobic biological treatment system as described above in the treatment of wastewater.
Based on the technical scheme, the wastewater anaerobic biological treatment system for seasonal strain preservation and recovery and the application thereof have at least one of the following advantages compared with the prior art:
1. The process reactor has the advantages of simple structure, convenient maintenance, simple operation logic, simple operation and maintenance, less manual requirements and easy realization of automatic control;
2. The dynamic stage monitoring based on the gas production rate and the change rate thereof is convenient to implement, does not need an extra instrument, has low cost for users, is simple and easy to implement, and is convenient to popularize;
3. The anaerobic sludge in the intermittent stage can be kept in the proliferation stage by the gas production rate-pH control mode, so that higher biomass and biological activity are maintained, and the rapid recovery operation is easy to realize;
4. The invention can be used for preserving and recovering strains of anaerobic treatment systems of seasonal waste water such as agricultural and sideline food processing waste water, industrial waste water produced intermittently and the like.
Drawings
FIG. 1 is a schematic flow diagram of a seasonal wastewater biological treatment system in accordance with an embodiment of the invention;
FIG. 2 is a schematic diagram of a control system for a seasonal wastewater biological treatment system in accordance with an embodiment of the invention;
FIG. 3 is a logic diagram of gas production rate versus pH monitoring for a seasonal wastewater biological treatment system in accordance with an embodiment of the invention;
FIG. 4 is a graph showing the recovery effect of COD removal effect at different intermittent times of the biological treatment system for seasonal wastewater according to the embodiment of the invention;
FIG. 5 is a graph showing the COD removal contribution rate of the biological treatment system for seasonal wastewater according to the embodiment of the invention.
Reference numerals:
1-a water inlet pool; 2-anaerobic biological treatment device; 3-a subsequent treatment device; 4-a temperature sensor; a 5-pH sensor; 6-a gas production rate sensor; 7-a water inlet control unit; 8-a water inlet unit; 9-a liquid level sensor;
The symbols: q-total daily flow; q-gas production rate; pH-pH value; delta-change value;
Subscript: biogas-gas production; in-water intake; e-normal value.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The invention discloses a wastewater anaerobic biological treatment system, which comprises:
a water inlet device for inputting wastewater to be treated;
The anaerobic biological treatment device is used for anaerobic biological treatment of wastewater to be treated;
A subsequent treatment device for further treating the wastewater passing through the anaerobic biological treatment device;
a monitoring device for monitoring and outputting parameters of the mixed liquor in the anaerobic biological treatment device, and
And a control device for controlling a servo component in the anaerobic biological treatment device based on the signal containing the parameter value output by the monitoring device, so as to adjust the corresponding parameter.
In some embodiments of the invention, the monitoring device comprises:
The biogas production rate sensor is used for monitoring the biogas production rate of biogas in the anaerobic biological treatment device;
the pH sensor is used for monitoring the pH of the mixed solution in the anaerobic biological treatment device;
The temperature sensor is used for monitoring the temperature of the mixed liquid in the anaerobic biological treatment device; and
And the liquid level sensor is used for monitoring the liquid level of the mixed liquid in the anaerobic biological treatment device.
In some embodiments of the invention, the control means performs the following logic:
when the daily accumulated gas yield or gas yield rate is reduced to be less than 1/3 of the normal operation value or the design value, judging that the wastewater treatment system enters a seasonal intermittent operation stage;
Starting water inflow when the gas production rate of the anaerobic biological treatment device is monitored to be less than 0.5-2.2 m 3CH4/m3 & d or less than 1/2-1/5 of the average value of the gas production rate of the day before the monitoring day;
Stopping water inflow when the pH of the mixed solution is monitored to be less than 6.9 to 7.3 or delta pH is monitored to be more than 0.2 to 0.7, wherein delta pH is the absolute value of pH change in unit time;
When the gas production rate of the anaerobic biological treatment device is monitored to be less than or equal to 0.05-1.5 m 3CH4/m3 & d, the water inflow is increased, the logic judgment of the gas production rate of the anaerobic biological treatment device is carried out again, when the liquid level value of the anaerobic biological treatment device is monitored to be greater than the liquid level protection value, the water level is reduced, and the intermittent operation stage is carried out;
when the gas production rate of the anaerobic biological treatment device is monitored to be more than 0.05 to 1.5m 3CH4/m3·d2, the cycle is ended, and the normal operation stage is returned;
in some embodiments of the invention, the step of lowering the water level is reduced to 1/10 to 1/2 of a level guard value in the anaerobic biological treatment device.
In some embodiments of the invention, the anaerobic biological treatment apparatus comprises a temperature adjustment unit for adjusting the temperature of the reactor;
In some embodiments of the invention, the anaerobic biological treatment device has a temperature of 21 to 39 ℃.
In some embodiments of the invention, the water inlet device comprises a water inlet tank and a water inlet unit, and the control device controls the water inlet unit to convey the wastewater to be treated from the water inlet tank to the anaerobic biological treatment device;
In some embodiments of the invention, the intake pool effective volume meets a maximum hour flow of 2 to 12 hours.
In some embodiments of the invention, the anaerobic biological treatment apparatus is comprised of one or more anaerobic biological treatment units, alone or in combination.
In some embodiments of the invention, the anaerobic biological treatment device is provided with a three-phase separator or membrane separation structure that reduces anaerobic sludge loss.
In some embodiments of the invention, the control device controls the water intake according to the kinetic phase in which the anaerobic biological treatment device is located;
in some embodiments of the invention, the wastewater anaerobic biological treatment system has a cycle of water inlet circulation of 2 to 30 days/time when in a batch operation phase.
The invention also discloses a logic control unit, which is used for executing the following logic:
when the daily accumulated gas yield or gas yield rate is reduced to be less than 1/3 of the normal operation value or the design value, judging that the wastewater treatment system enters a seasonal intermittent operation stage;
Starting water inflow when the gas production rate of the anaerobic biological treatment device is monitored to be less than 0.5-2.2 m 3CH4/m3 & d or less than 1/2-1/5 of the average value of the gas production rate of the day before the monitoring day;
Stopping water inflow when the pH of the mixed solution is monitored to be less than 6.9 to 7.3 or delta pH is monitored to be more than 0.2 to 0.7, wherein delta pH is the absolute value of pH change in unit time;
When the gas production rate of the anaerobic biological treatment device is monitored to be less than or equal to 0.05-1.5 m 3CH4/m3 & d, the water inflow is increased, the logic judgment of the gas production rate of the anaerobic biological treatment device is carried out again, when the liquid level value of the anaerobic biological treatment device is monitored to be greater than the liquid level protection value, the water level is reduced, and the intermittent operation stage is carried out;
when the gas production rate of the anaerobic biological treatment device is monitored to be more than 0.05 to 1.5m 3CH4/m3·d2, the cycle is ended, and the normal operation stage is returned;
In some embodiments of the invention, the step of lowering the water level is reduced to 1/10 to 1/2 of a level guard value in the anaerobic biological treatment device;
In some embodiments of the invention, the logic control unit is a PLC, FPGA, single chip, single board computer, computer or server.
The invention also discloses application of the wastewater anaerobic biological treatment system in sewage treatment.
The technical scheme of the invention is further described below by means of specific embodiments and with reference to the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
As shown in fig. 1, the seasonal wastewater biological treatment system (i.e., the wastewater anaerobic biological treatment system for seasonal strain preservation and recovery) of the invention is composed of a water inlet tank 1, an anaerobic biological treatment device 2, a subsequent treatment device 3, a temperature sensor 4, a pH sensor 5, a gas production rate sensor 6, a water inlet control unit 7, a water inlet unit 8 and a liquid level sensor 9. Under the control of the water inlet control unit 7, the water inlet unit 8 conveys wastewater from the water inlet tank 1 to the anaerobic biological treatment device 2 through a pipeline; after the anaerobic biological treatment device 2 discharges water, the water enters a subsequent treatment device 3 for further treatment.
The online monitoring of the water inlet control unit 7 respectively comprises a temperature sensor 4, a pH sensor 5 and a gas production rate sensor 6; the temperature sensor 4, the pH sensor 5 and the liquid level sensor 9 are arranged in the mixed liquid of the anaerobic biological treatment device 2, the gas production rate sensor 6 is positioned at a methane outlet of the anaerobic biological treatment device 2, and the monitoring result of the sensor is connected into the water inlet control unit 8 through a transmitter. The water inlet unit 8 is connected to the water inlet control unit 7 by a cable.
The water inlet of the anaerobic biological treatment device 2 is controlled by a water inlet control unit 7 according to the dynamics stage of the anaerobic biological treatment device 2. The water inflow control unit 7 judges the dynamics stage of the anaerobic biological system on line in real time based on the monitoring data of the pH sensor 5 and the gas production rate sensor 6, and determines the water inflow strategy of the anaerobic biological treatment device 2 according to the dynamics stage.
The water inlet tank 1 is used for water inlet of the anaerobic biological treatment device and provides certain water quantity buffering and adjusting capacity. This capacity for buffering and regulating the water amount is determined by the difference between the water intake and the capacity of the sewage system, so that the effective volume of the water intake basin is usually designed to be a maximum hour flow of 2 to 12 hours. According to the water quality and water quantity characteristics of the high-concentration organic wastewater, the wastewater enters the water inlet tank 1 after pretreatment.
Anaerobic biological treatment apparatus 2 is composed of one or a plurality of anaerobic biological treatment units, singly or in combination, and connected to each other. The anaerobic biological treatment device 2 adopts measures for preventing or reducing the loss of anaerobic sludge, and the water outlet mode is not limited. Such measures to prevent or reduce anaerobic sludge loss include, but are not limited to, various configurations of three-phase separators, different forms of membrane separation, and the like. For example, membrane separation may be tubular, flat and hollow fiber membranes, or external and submerged (integrated, split).
The post-treatment device 3 further treats the effluent of the anaerobic biological treatment device according to the use of the effluent and the direction of the effluent.
The anaerobic biological treatment device 2 is provided with a temperature adjusting unit, and the temperature adjusting unit is a temperature control system or an external heat preservation structure.
The temperature sensor 4, the pH sensor 5, the gas production rate sensor 6, and the liquid level sensor 9 all reflect the state of the anaerobic biological treatment apparatus 2. Wherein, the temperature sensor 4, the pH sensor 5 and the liquid level sensor 9 are used for monitoring the temperature, the pH value and the liquid level of the mixed liquid in the anaerobic biological treatment device 2 and transmitting the monitoring results to the water inlet control unit 7; the biogas production rate sensor 6 is used for monitoring the biogas production rate of the anaerobic biological treatment device 2 and transmitting the monitoring result to the water inlet control unit 7.
The operation method of the strain preservation and recovery control system of the seasonal wastewater anaerobic biological treatment device is that anaerobic digestion sludge is inoculated to the anaerobic biological treatment device 2; the high-concentration organic wastewater is conveyed to a water inlet tank 1 and sequentially passes through a water inlet unit 8, an anaerobic biological treatment device 2 and a subsequent treatment device 3. When the seasonal wastewater is intermittently interrupted, the anaerobic biological treatment device 2 adopts a gas production rate-pH monitoring mode to judge the kinetic stage of anaerobic sludge in the anaerobic biological treatment device 2 and control the water inflow of the anaerobic biological treatment device 2. The effluent from the anaerobic biological treatment device 2 should have the ability to prevent or reduce anaerobic sludge loss, such as the aforementioned three-phase separation or membrane separation, so that the anaerobic sludge loss rate is less than 30%. The produced gas of the anaerobic biological treatment device 2 is collected at a methane outlet.
The temperature of the mixed solution in the anaerobic biological treatment apparatus 2 is kept at 21 to 39 ℃.
As shown in fig. 3, the gas production rate-pH monitoring mode refers to that according to the water quality and water quantity condition of seasonal wastewater, the daily accumulated gas production rate Q biogas or the gas production rate Q in(Qbiogas is the accumulated total gas production rate monitored on the same day, Q in is the current monitored gas production rate per hour) is reduced to less than 1/3 of the normal operation value Q de (corresponding design value or expected value, such as the expected daily gas production rate or expected hour gas production rate under the current load), it is determined that the wastewater treatment system enters the seasonal intermittent operation stage, the anaerobic biological treatment system is in the intermittent operation stage, and the process equipment such as a water inlet pump is turned to intermittent operation;
The water inflow strategy of the anaerobic biological treatment device 2 is that the gas production rate q biogas＜(0.5-2.2)m3CH4/m3.d (daily gas production rate per unit cell volume), or the water inflow unit 8 is started when 1/2 to 1/5 of the average value of the gas production rate per day before the day is monitored, water inflow is started, and the water inflow is stopped when the pH is less than 6.9-7.3 or the delta pH is more than 0.2-0.7, wherein q biogas is the monitored gas production rate, namely the gas production rate per hour or minute per unit time; Δph is the magnitude of the monitored pH change, i.e., the absolute value of the change in pH per hour or minute per unit time; the gas production rate change rate delta q biogas of the anaerobic biological treatment device 2 after water inflow is more than 0.05-1.5 m 3CH4/m3·d2, otherwise, the water inflow strategy range of the gas production rate-pH monitoring mode is widened so as to increase the single water inflow; in the process of widening the range, liquid level protection is performed based on the monitored value of the liquid level sensor 9, and water inflow is stopped when the monitored liquid level value is greater than or equal to a design value, so that the highest design protection water level of the reactor is avoided.
When the anaerobic biological treatment device 2 is judged to be in an intermittent operation stage by adopting a gas production rate-pH monitoring mode, the liquid level in the anaerobic biological treatment device 2 is reduced to be 1/10-1/2 of a liquid level protection value according to the monitoring result of the liquid level sensor 9.
When the system is in an intermittent operation stage for a long time, after one cycle is finished, the operation interval period of the water inlet strategy is 2-30 days/time.
The strain preservation and recovery control system of the seasonal wastewater anaerobic biological treatment device and the operation method thereof can preserve anaerobically digested strains, achieve the purposes of preserving and recovering strains in the intermittent operation period of seasonal wastewater, and realize the stable anaerobic treatment of continuous and stable operation and reduced inoculation and domestication of the anaerobic wastewater treatment system.
The strain preservation and recovery control system of the anaerobic biological treatment device for seasonal wastewater and the operation method thereof can be applied to seasonal wastewater in industries such as agricultural and sideline food processing industry for producing potato starch and sugarcane sugar, and also can be applied to intermittent wastewater in industries such as fermentation in batch production, and the like, so as to realize strain preservation and recovery and stable standard-reaching treatment of the anaerobic biological treatment device.
The invention can automatically determine the water inflow and the running load according to the water quality and the water quantity of the incoming water and the kinetic stage of the anaerobic sludge. Anaerobic sludge proliferation curve can be divided into adaptation phase, proliferation phase and decay phase, substrate in the proliferation phase can meet the requirements of anaerobic microorganism strain preservation and proliferation, and bacterial activity in the decay phase is reduced and even aging and death affect strain preservation and recovery. The water inflow and the water inflow load are controlled in anaerobic digestion control, and mainly play a role in increasing the concentration and the total amount of the substrate, thereby promoting the division and proliferation of anaerobic bacteria. The anaerobic sludge is intermittently improved to the proliferation period in the intermittent operation stage by adopting the gas production rate-pH to monitor the anaerobic flora seed preservation and proliferation process, so that the anaerobic sludge can be timely judged, the preservation time of anaerobic bacteria seeds is prolonged, the activity of preserved bacteria is improved, and the anaerobic sludge is convenient to recover. Not only avoids insufficient gas production of the substrate caused by a small amount of continuous low-load water inflow, but also prevents anaerobic bacteria species from entering an endogenous respiratory phase (decay phase); the carbon source or nutrient added for preserving the strains is greatly reduced, and the running cost in the intermittent period is reduced; meanwhile, a large amount of unaccounted sludge which is required to be input for re-inoculation is avoided or reduced, the adaptation period required for production recovery is shortened, and quick up-to-standard and stable operation is realized. Compared with the anaerobic system activity monitoring method based on volatile organic acids (VFAs) and the like, the method has the advantages that the instrument required for monitoring the gas production rate is simple and widely applied, the dynamic stage of the anaerobic sludge can be judged through the automatic analysis of monitoring and control logic, and the method has the characteristics of simplicity, easiness and convenience in popularization. By adopting the operation method of the invention, the seasonal waste water anaerobic biological treatment device can effectively prolong the strain preservation period, improve the activity of the preserved strain, realize quick recovery production, reduce the time and cost required by re-inoculation and domestication, reduce the carbon source addition taking strain preservation and recovery as targets, and achieve the purposes of preserving and facilitating recovery of the strain after the existing domestication.
Example 1
Please refer to fig. 1-3. The seasonal wastewater biological treatment system is formed by combining a water inlet tank 1, an anaerobic biological treatment device 2, a subsequent treatment device 3, a temperature sensor 4, a pH sensor 5, a gas production rate sensor 6, a water inlet control unit 7, a water inlet unit 8 and a liquid level sensor 9 and is used for treating potato starch wastewater or ocean vessel black water. The potato starch factory is limited to autumn and winter production due to potato supply, the production stopping time can be as long as several days to several months, and the potato starch factory has strong seasonality; the ocean vessel wastewater can enter intermittent operation stages with different lengths according to the requirements of the discharged sea area.
The seasonal potato starch wastewater enters a water inlet tank after being pretreated by protein extraction, grating, sand sedimentation and the like. Under the control of the water inlet control unit, incoming water is conveyed from a water inlet tank to the anaerobic biological treatment device by a water inlet pump, and after anaerobic treatment, the outgoing water enters the subsequent treatment device 3. After the water inlet control unit judges that the system enters an intermittent operation stage, the anaerobic sludge is in an endogenous respiration period for 5-240 hours, and then the water inlet pump is intermittently started. In the whole operation process, the water inlet control unit 7 intermittently restores anaerobic sludge to the proliferation period; the gas production rate and pH data collected from the reactor are used for controlling the sludge growth stage by adopting the gas production rate-pH monitoring mode to realize the preservation and recovery of the strain. The strain loss rate of the reactor is lower than 50-80%, and the methanogenic bacteria activity is not lower than 40-70%.
The water inlet load is a main technological parameter for anaerobic digestion engineering control, and can effectively preserve strains in a gas production rate-pH monitoring mode, thereby not only reducing the seed preservation cost of an external carbon source, avoiding re-inoculation and domestication, but also realizing rapid recovery of production.
After stopping for 5-20 days by adopting a strain preservation recovery technology, the effluent COD is recovered to stably run within 24 hours, and the contribution rate of the anaerobic treatment system to COD removal is effectively recovered.
As shown in FIG. 4, the recovery effect of COD removal effect of the seasonal wastewater biological treatment system in different intermittent time is shown, and as shown in FIG. 4, the COD of the effluent can be stably recovered to below 300 mg.L -1 required by the second-level discharge standard of GB8978-96 comprehensive discharge Standard for wastewater in the interval period of 5-20 days. Wherein, when the interval is less than 20 days, the standard can be recovered within 12 hours; and when the interval time is more than 20 days, the standard can be recovered within 24 hours. The above results provide a reliable way to borrow from intermittent operation of seasonal wastewater treatment systems. The results shown in FIG. 5 are further illustrative of the excellent recovery of the anaerobic biological treatment system, as shown in FIG. 5, which is a graph of the COD removal contribution rate effect of the seasonal wastewater biological treatment system. Wherein, when the interval period is 5-20 days, the average removal rate of the anaerobic biological process is always more than 80 percent, and is close to 90 percent after 24 hours; the average removal rate of COD of the membrane separation is always more than 65%, and the average removal rate of COD of the membrane separation can be kept more than 75% after 24 hours. The intermittent period has a greater effect on membrane system removal than on biological system removal, possibly due to membrane relaxation; the biological system recovery effect is better than the membrane system recovery effect, and further shows that the seasonal strain preservation recovery system has obvious effect.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (9)
1. An anaerobic biological wastewater treatment system, comprising:
a water inlet device for inputting wastewater to be treated;
The anaerobic biological treatment device is used for anaerobic biological treatment of wastewater to be treated;
A subsequent treatment device for further treating the wastewater passing through the anaerobic biological treatment device;
The monitoring device is used for monitoring parameters of the mixed liquor in the anaerobic biological treatment device and outputting the parameters; and
A control device for controlling a servo part in the anaerobic biological treatment device based on the signal containing the parameter value output by the monitoring device, thereby adjusting the corresponding parameter;
wherein the control device performs the following logic:
when the daily accumulated gas yield or gas yield rate is reduced to be less than 1/3 of the normal operation value or the design value, judging that the wastewater treatment system enters a seasonal intermittent operation stage;
Starting water inflow when the gas production rate of the anaerobic biological treatment device is monitored to be less than 0.5-2.2 m 3CH4/m3 & d or less than 1/2-1/5 of the average value of the gas production rate of the day before the monitoring day;
Stopping water inflow when the pH of the mixed solution is monitored to be less than 6.9 to 7.3 or delta pH is monitored to be more than 0.2 to 0.7, wherein delta pH is the absolute value of pH change in unit time;
When the gas production rate of the anaerobic biological treatment device is monitored to be less than or equal to 0.05-1.5 m 3CH4/m3 & d, the water inflow is increased, the logic judgment of the gas production rate of the anaerobic biological treatment device is carried out again, when the liquid level value of the anaerobic biological treatment device is monitored to be greater than the liquid level protection value, the water level is reduced, and the intermittent operation stage is carried out;
when the gas production rate of the anaerobic biological treatment device is monitored to be more than 0.05 to 1.5m 3CH4/m3·d2, the cycle is ended, and the normal operation stage is returned;
Wherein, in the step of reducing the water level, the water level is reduced to 1/10 to 1/2 of the liquid level protection value in the anaerobic biological treatment device.
2. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The monitoring device includes:
The biogas production rate sensor is used for monitoring the biogas production rate of biogas in the anaerobic biological treatment device;
the pH sensor is used for monitoring the pH of the mixed solution in the anaerobic biological treatment device;
The temperature sensor is used for monitoring the temperature of the mixed liquid in the anaerobic biological treatment device; and
And the liquid level sensor is used for monitoring the liquid level of the mixed liquid in the anaerobic biological treatment device.
3. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The anaerobic biological treatment device comprises a temperature adjusting unit for adjusting the temperature of the reactor;
wherein the temperature of the anaerobic biological treatment device is 21-39 ℃.
4. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The water inlet device comprises a water inlet tank and a water inlet unit, and the control device controls the water inlet unit to convey wastewater to be treated from the water inlet tank to the anaerobic biological treatment device;
Wherein the effective volume of the water inlet pool meets the maximum hour flow rate of 2 to 12 hours.
5. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The anaerobic biological treatment device is composed of one or more anaerobic biological treatment units singly or in combination.
6. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The anaerobic biological treatment device is provided with a three-phase separator or a membrane separation structure for reducing anaerobic sludge loss.
7. The anaerobic biological wastewater treatment system according to claim 1, wherein,
The control device controls water inflow according to the dynamics stage of the anaerobic biological treatment device;
The wastewater anaerobic biological treatment system has a water inlet circulation period of 2 to 30 days/time when in an intermittent operation stage.
8. A logic control unit for a wastewater anaerobic biological treatment system according to any one of claims 1 to 7, wherein the logic control unit is adapted to perform the following logic:
when the daily accumulated gas yield or gas yield rate is reduced to be less than 1/3 of the normal operation value or the design value, judging that the wastewater treatment system enters a seasonal intermittent operation stage;
Starting water inflow when the gas production rate of the anaerobic biological treatment device is monitored to be less than 0.5-2.2 m 3CH4/m3 & d or less than 1/2-1/5 of the average value of the gas production rate of the day before the monitoring day;
Stopping water inflow when the pH of the mixed solution is monitored to be less than 6.9 to 7.3 or delta pH is monitored to be more than 0.2 to 0.7, wherein delta pH is the absolute value of pH change in unit time;
When the gas production rate of the anaerobic biological treatment device is monitored to be less than or equal to 0.05-1.5 m 3CH4/m3 & d, the water inflow is increased, the logic judgment of the gas production rate of the anaerobic biological treatment device is carried out again, when the liquid level value of the anaerobic biological treatment device is monitored to be greater than the liquid level protection value, the water level is reduced, and the intermittent operation stage is carried out;
when the gas production rate of the anaerobic biological treatment device is monitored to be more than 0.05 to 1.5m 3CH4/m3·d2, the cycle is ended, and the normal operation stage is returned;
wherein, in the step of reducing the water level, the water level is reduced to 1/10 to 1/2 of the liquid level protection value in the anaerobic biological treatment device;
wherein the logic control unit is a PLC, an FPGA, a singlechip, a single-board computer, a computer or a server.
9. Use of the wastewater anaerobic biological treatment system according to any one of claims 1 to 7 in wastewater treatment.
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