CN-122010302-A - Self-screening concentration continuous flow aerobic granular sludge reactor and control method thereof

CN122010302ACN 122010302 ACN122010302 ACN 122010302ACN-122010302-A

Abstract

The invention discloses a self-screening concentration continuous flow aerobic granular sludge reactor and a control method thereof, wherein the sludge reactor comprises an anaerobic tank, an aeration concentration tank, a sludge separator, a secondary sedimentation tank and a reactor control system; the reactor and the control method thereof construct a set of reactor control system of intelligent monitoring, prediction and control, which is used for realizing screening of aerobic granular sludge in the sludge separator, so that the aerobic granular sludge is separated from flocculent sludge more efficiently and accurately.

Inventors

CAO TIANYU
FANG ZHOU
WANG YANG
LIU RUIYANG
ZHENG PINGPING
JIA SIYAO

Assignees

北京华益德环境科技有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The self-screening concentration continuous flow aerobic granular sludge reactor is characterized by comprising an anaerobic tank, an aeration concentration tank, a sludge separator, a secondary sedimentation tank and a reactor control system, wherein the anaerobic tank, the aeration concentration tank, the sludge separator and the secondary sedimentation tank are sequentially connected, and the sludge separator is arranged in the aeration concentration tank; the aeration concentration tank comprises a first sludge reflux system, wherein the first sludge reflux system comprises a first sludge reflux pipe and an air pipe, and two ends of the first sludge reflux pipe are respectively connected with the bottom of the aeration concentration tank and the anaerobic tank; The sludge separator comprises a sludge separator water inlet system and a sludge separator water outlet system, wherein the sludge separator is provided with a sludge separator outlet, the sludge separator water inlet system comprises a water distribution tank, a separator air pipe and a water inlet rectifying plate, and the separator air pipe is provided with a second valve and is connected with a separator blower; the secondary sedimentation tank comprises a second sludge reflux system and a surplus sludge discharge system, the second sludge reflux system comprises a second sludge reflux pipe and a second sludge reflux pump, two ends of the second sludge reflux pipe are respectively connected with the bottom of the secondary sedimentation tank and the aeration tank, and the second sludge reflux pump is arranged on the second sludge reflux pipe; The excess sludge discharge system comprises an excess sludge discharge pump and an excess sludge discharge pipe, wherein two ends of the excess sludge discharge pipe are respectively connected with the bottom of the secondary sedimentation tank and a sludge dewatering machine room; The reactor control system comprises a monitoring system and an intelligent control system, wherein the monitoring system is arranged at the anaerobic tank, the aeration concentration tank, the sludge separator and the secondary sedimentation tank, the intelligent control system judges according to data detected by the monitoring system, and adjusts the opening and closing of the first valve and the second valve and the opening and closing of the second valve according to judging results, and adjusts the opening and closing of the second sludge reflux pump and the residual sludge discharge pump and pump frequency.
2. The sludge reactor as claimed in claim 1, wherein the upper portion of the sludge separator is a rectangular box, and the bottom portion of the sludge separator is contracted to a sludge separator outlet.
3. The sludge reactor as claimed in claim 1, wherein the anaerobic tank comprises an anaerobic tank body and a first agitator; The aeration tank comprises an aeration tank body and a first aeration system, the first aeration system comprises a first aeration pipe and a first aeration disc, the first aeration pipe is arranged at the bottom of the aeration tank body, and the first aeration disc is arranged on the first aeration pipe; The aeration concentration tank further comprises an aeration concentration tank body and a second aeration system, wherein the second aeration system comprises a second aeration pipe and a second aeration disc, the second aeration disc is arranged on the second aeration pipe, and the second aeration system is arranged at the bottom of the aeration concentration tank.
4. The sludge reactor as claimed in claim 1, wherein the secondary sedimentation tank has a secondary sedimentation tank outlet pipe for discharging supernatant out of the secondary sedimentation tank.
5. The sludge reactor as claimed in claim 1, wherein the monitoring system comprises a suspended matter concentration meter, an electromagnetic flowmeter, a dissolved oxygen meter, a sludge concentration meter, an oxidation-reduction potentiometer, an ammonia nitrogen/nitrate analyzer, a total nitrogen analyzer, an ammonia nitrogen meter, a chemical oxygen demand meter, and a laser particle sizer.
6. A control method of a self-screening concentrated continuous flow aerobic granular sludge reactor is used for controlling the self-screening concentrated continuous flow aerobic granular sludge reactor according to claim 1, and is characterized in that, The method comprises the following steps: S1, continuously acquiring past operation characteristic data in a sludge reactor by using a monitoring system; s2, inputting past operation characteristic data in the sludge reactor into a pre-trained support vector machine model based on an improved sigmoid function, and obtaining a classification judgment result of a predicted future operation state of the sludge reactor; S3, according to the classification judgment result, a control instruction aiming at least one operation parameter of the sludge reactor is generated by combining a preset control rule; s4, according to the control instruction, corresponding operation parameters of the sludge reactor are adjusted.
7. The control method according to claim 6, further comprising, before the step S2, a training step of a support vector machine model based on an improved sigmoid function, by which a support vector machine model based on an improved sigmoid function trained in advance can be obtained, the support vector machine model being: ; Wherein, the In order to support the input of the vector machine model, To output the final support vector machine model, The sign function is represented by a sign function, Representing a natural exponential function of the sign, As a logarithm of the empirical data, Is that For the first of the empirical data In the case of a pair of the two, To support iterative valuing of normal vector parameters of the vector machine model, Is that Is the first of (2) The number of components of the composition, To support the iterative valued of the intercept parameters of the vector machine model, The value of the next iteration of the gaussian kernel function parameter is taken, , Is the number of iterations.
8. The control method of claim 7, wherein the training step based on the support vector machine model that improves the sigmoid function comprises: (1) Determination of sludge reactor correlation Past operating characteristics, order Indicating this The values of the past operating characteristics, i.e. the inputs to the support vector machine model, Is that A dimension real space; (2) Determination of sludge reactor correlation A future operating state class; (3) The sigmoid function is designed as follows: ; Wherein, the In order to improve the sigmoid function, In order to improve the input of the sigmoid function, Is a natural constant which is used for the production of the high-temperature-resistant ceramic material, Parameters for improving the sigmoid function; (4) Support vector machine model training algorithm is designed based on Gaussian kernel function and improved sigmoid function, for The first of the categories Class and number The class of the product, Respectively training, and then obtaining the predicted classification judgment result of the future running state of the sludge reactor.
9. The control method according to claim 8, wherein the classification judgment result of the predicted future operation state of the sludge reactor includes: The ideal screening method comprises the steps of (1) ideal screening, namely, the sludge reactor runs while meeting the following conditions that the ratio of the concentration of the sludge at the upper part to the concentration of the sludge at the middle part in a sludge separator is less than 0.3, the concentration of the effluent of the sludge separator is less than 300 mg/L, and the concentration of the sludge in an aeration concentration tank is stable and does not have continuous descending trend; The screening is insufficient, namely the sludge reactor runs under any condition that the ratio of the sludge concentration of the upper part to the sludge concentration of the middle part in the sludge separator is more than 0.7, the concentration of the middle part and the lower part continuously rises for more than 4 hours, and the inflow water flow rate of the sludge separator is lower than 80 percent of the corresponding flow rate of the design surface load; The type 3 is excessive in screening, namely the sludge reactor runs while meeting the following conditions that the sludge concentration of an aeration concentration tank continuously drops for more than 72 hours, the daily drop amplitude is more than 3 percent, no sludge discharge is increased, the water outlet concentration of the sludge separator has intermittent peaks, namely the peak value is more than 2 times of the normal value, or the water inlet flow rate of the sludge separator is higher than 120 percent of the corresponding flow rate of the design surface load; The type 4 is impacted, namely the operation of the sludge reactor meets any condition that the change rate of the inflow water flow of the sludge separator within 10 minutes is more than 30 percent, the concentration of the middle upper part and the concentration of the middle lower part of the sludge separator synchronously and severely fluctuate, the fluctuation range is more than 20 percent, and the outflow water concentration of the sludge separator is temporarily and rapidly risen, namely the peak value is more than 3 times of the normal value.
10. The control method according to claim 9, wherein S3 and S4 are specifically: when the classification judgment result of the predicted future running state of the sludge reactor is that: The control rule is that the current operation parameters are maintained, the switching degree of the first valve and the switching degree of the second valve are kept unchanged, the operation frequency of the separator blower is kept unchanged, and the pump frequencies of the second sludge reflux pump and the residual sludge discharge pump are kept unchanged; In the category 2, the control rule is that the ascending flow rate of the sludge separator is improved, the control instruction is that the second valve is opened, the opening is increased by 5-10%, the running frequency of the blower of the separator is improved, the frequency is increased by 5-10%, and the opening is increased by 5-10% when the first valve is opened; In the category 3, the control rule is that the rising flow rate of the sludge separator is reduced, the control instruction is that the opening of the second valve is reduced by 5-15%, the running frequency of a blower of the separator is reduced by 5-15%, and the pump frequency of the second sludge reflux pump is increased by 5-10%; And in the category 4, the control rule is that the anti-impact protection mode is entered, the control instruction is that the opening of the second valve is reduced by 10-15%, the running frequency of the separator blower is reduced by 5-15%, and the first valve, the second sludge reflux pump and the residual sludge discharge pump are closed.

Description

Self-screening concentration continuous flow aerobic granular sludge reactor and control method thereof Technical Field The invention belongs to the field of sewage treatment, and particularly relates to a self-screening concentration continuous flow aerobic granular sludge reactor and a control method thereof. Background The activated sludge process is one of the most widely used technologies in municipal wastewater treatment, and since 1914 was invented by british scientists Arden and Lockett, it has become the dominant process for treating municipal wastewater. The technology degrades organic pollutants in sewage through microorganism groups (activated sludge), and the basic flow comprises partitions with different dissolved oxygen concentrations to provide a proper biochemical reaction environment, a secondary sedimentation tank to realize sludge-water separation, a sludge reflux system to maintain biomass balance and a residual sludge discharge system. In the course of over one hundred years of development, the activated sludge process has undergone a technological evolution from simple organic removal to efficient nitrogen and phosphorus removal to meet increasingly stringent water quality emission standards. In recent years, the problem of exceeding total nitrogen concentration frequently occurs, and the traditional process cannot meet the increasingly strict emission standard gradually. The aerobic granular sludge is granular biological aggregate formed by self-coagulation of microorganisms in a specific environment, and has regular appearance shape, compact structure and excellent sedimentation performance compared with the traditional flocculent activated sludge. The inside of the granular sludge is layered by aerobic, facultative and anaerobic microorganisms, the structure provides ideal microenvironment for synchronous nitrification and denitrification and dephosphorization, and in addition, the continuous flow aerobic granular sludge technology is more suitable for in-situ upgrading and capacity expansion of current sewage treatment plants, so that the continuous flow aerobic granular sludge technology has a huge application prospect. Currently, the application of aerobic granular sludge technology in practical engineering mainly depends on Sequencing Batch Reactors (SBR). The SBR is controlled by operation in time sequence to create the required selective pressure for forming the aerobic granular sludge, and a Sequencing Batch Reactor (SBR) is an intermittently operated activated sludge treatment system, integrates the working procedures of aeration, precipitation, drainage and the like which are finished by different structures in the traditional continuous flow process into a reaction tank and periodically performs time sequence. One complete operating cycle of SBR typically includes five phases of water intake, aeration, precipitation, drainage and idling, although SBR has been successful in aerobic granular sludge culture, there are some inherent limitations to the intermittent operating mode. In addition, SBR has a low reactor volume utilization because the reactor needs to perform multiple functions in sequence during the same cycle. Furthermore, the discontinuous water outlet characteristics require that the subsequent processing units have a large buffer capacity and are difficult to connect in series with conventional continuous flow processing processes. These limitations have prompted researchers to explore technological pathways for culturing and using aerobic granular sludge in a continuous flow mode. The continuous flow aerobic granular sludge treatment technology is still in a research and development stage, has a large research direction, but has few engineering application cases. The technology still needs to be continuously optimized to improve the sludge screening and separating efficiency, so that the treatment effect is further improved, the energy consumption is reduced, and the conversion problem from pilot scale test and pilot scale test to engineering is solved. Disclosure of Invention In order to explore engineering application of a continuous flow aerobic granular sludge treatment technology and improve screening and separating efficiency of aerobic granular sludge (also called granular sludge) in the continuous flow aerobic granular sludge treatment technology, the invention provides a self-screening concentration continuous flow aerobic granular sludge reactor and a control method thereof, and the specific technical scheme is as follows: The invention discloses a self-screening concentration continuous flow aerobic granular sludge reactor which comprises an anaerobic tank, an aeration concentration tank, a sludge separator, a secondary sedimentation tank and a reactor control system, wherein the anaerobic tank, the aeration concentration tank, the sludge separator and the secondary sedimentation tank are sequentially connected, and the sludge separator is arranged