WO2022183587A1 - Inverted adsorption precipitation system and process based on classification and recovery of carbon sources - Google Patents

Abstract

Disclosed in the present invention are an inverted adsorption precipitation system and process based on classification and recovery of carbon sources. Sewage to be treated first passes through a front-mounted inclined plate precipitation tank to recover particulate carbon sources, and then enters a rear-mounted micro-aerobic aeration activated sludge adsorption tank to adsorb and recover colloids and dissolved carbon sources in the sewage, wherein the sewage to be treated is sewage treated by a grating and a grit chamber to remove garbage and silt therein. In the whole process, the aeration energy consumption of the activated sludge adsorption tank is further reduced in an intermittent operation mode. The front-mounted precipitation tank is mainly used for recovering the particulate carbon sources which are easy to settle in the sewage, and the recovery costs of the particulate carbon sources are reduced to the maximum extent by means of the simplest precipitation mode. The removal of the particulate carbon sources remarkably reduces the load pressure of the rear-mounted activated sludge adsorption tank, such that the rear-mounted activated sludge adsorption tank only recovers the residual colloids and dissolved carbon sources in the sewage, the recovery capacity is greatly improved, and the recovery efficiency is remarkably improved.

Description

An inverted adsorption precipitation system and process based on carbon source classification and recovery technical field

The invention belongs to the technical field of environmental protection and sewage treatment, and in particular relates to an inverted adsorption precipitation system and process based on carbon source classification and recovery.

Background technique

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

The rapid growth of population and the rapid development of urbanization have led to a rapid increase in sewage discharge. Sewage is an effective carrier of resources, which contains a large number of carbon sources. Fully recycling these carbon sources and converting resources is the key to achieving energy neutralization in sewage treatment. important way to sustainable development. Various forms of carbon sources in sewage (particle state (particle size > 12 μm), colloidal state (particle size 0.45-12 μm) and dissolved state (particle size < 0.45 μm)) accounted for 50%, 20% and 50% of the total carbon source, respectively. About 30%, the granular carbon source can be divided into two types: easy to precipitate and difficult to precipitate. The granular carbon source that is easy to precipitate generally has a larger particle size, accounting for about 30% of the carbon source in the sewage, and this part of the carbon source can pass through. Precipitation is directly recycled, and the carbon sources that are not easy to precipitate are colloidal particles and dissolved carbon sources with small particle size in the sewage, accounting for about 70%. source organic carbon for recovery.

The recovery and recycling process of carbon sources in sewage is generally divided into three steps: first, the sewage is treated by grids and grit chambers to remove the garbage and sediment in it, providing a basis for recycling carbon sources in sewage; second, through Different carbon source recovery processes recover the carbon source in the sewage; finally, the recovered carbon source can be converted into resources and energy through anaerobic digestion and other methods. Among them, the recovery process of carbon source is the core of the whole process, and its innovation and improvement are of great significance to the realization of sewage recycling.

The traditional activated sludge method is currently the most widely used sewage treatment technology. It utilizes the metabolism of activated sludge microorganisms to achieve longer sludge retention time (5-7d) and hydraulic retention time (>2h), lower organic Under the conditions of load (0.2-0.4kgBOD ₅ /kgMLSS/d) and sufficient oxygen (DO>2mg/L), a large amount of carbon sources in sewage can be mineralized, and the effective recovery of carbon sources in sewage cannot be realized. "It makes the traditional activated sludge process unsustainable.

The high-load activated sludge method is currently the mainstream process for recycling carbon sources in sewage, which consists of a front adsorption tank and a rear sedimentation tank. After the sewage is pretreated by the grille and the grit chamber, it first enters the adsorption tank to be mixed with the activated sludge, adsorbed or absorbed by the activated sludge, and precipitated and concentrated in the sedimentation tank, and finally discharged through the excess sludge for recycling. The high-load activated sludge method utilizes activated sludge under extremely short sludge retention time (0.3-0.5d), hydraulic retention time (30min) and extremely high organic load (2-6kg BOD ₅ /kgMLSS/d). The biological flocculation adsorption and precipitation concentration realize the enrichment and recovery of carbon sources in sewage, but the inventor found that such a recovery process is a mixed recovery of carbon sources in sewage (that is, various forms of carbon sources in sewage are mixed in sewage. At the same time, it is absorbed or absorbed by the sludge and then recovered), such a recovery method leads to the loss of a large amount of carbon sources (the lost carbon source accounts for about 30-50% of the total carbon source), and the carbon source recovery rate is very low, about 30%.

SUMMARY OF THE INVENTION

Aiming at the technical problems existing in the prior art, the present invention provides an inverted adsorption precipitation system and process based on the classification and recovery of carbon sources. The overall process consists of a pre-sedimentation tank and a rear activated sludge adsorption tank. The pre-sedimentation tank is mainly for the recovery of particulate carbon sources that are easy to precipitate in sewage, and the recycling cost of particulate carbon sources is minimized through the simplest precipitation method. On the one hand, the removal of particulate carbon source significantly reduces the load pressure of the post-activated sludge adsorption tank, and on the other hand, the post-activated sludge adsorption tank can only adsorb and recover the remaining colloidal and dissolved carbon sources in the sewage. Efficiency is significantly improved.

In order to solve the above technical problems, the following one or more embodiments of the present invention provide the following technical solutions:

In the first aspect, the present invention provides an inverted adsorption and sedimentation system based on the classification and recovery of carbon sources, including: a sloping plate sedimentation tank and an activated sludge adsorption tank, wherein,

The bottom of the inclined plate sedimentation tank is funnel-shaped, the lowest end of the bottom is connected with the sludge pipe, the upper part of the middle is provided with a inclined plate, the side is provided with a first water inlet pipe, and the water inlet position is provided with a baffle plate , so that the influent water enters from the middle and lower part of the inclined plate sedimentation tank; a perforated overflow pipe is arranged above the inclined plate;

The activated sludge adsorption tank is filled with activated sludge, one end of the second water inlet pipe is connected with the perforated overflow pipe, and the other end is connected with the lower end of the activated sludge adsorption tank; the lower end of the activated sludge adsorption tank is provided with aeration The bottom is provided with a sludge discharge port, and the water outlet is located in the middle of the activated sludge adsorption tank.

In the second aspect, the present invention provides an inverted adsorption tank precipitation process based on carbon source classification and recovery, comprising the following steps:

The sewage to be treated is first precipitated by the inclined plate sedimentation tank to recover the easy-to-precipitate carbon source, and then the initially purified sewage overflows to the bottom of the activated sludge adsorption tank. Under the adsorption and absorption of the activated sludge, the carbon source in the sewage is recovered. ;

The sewage to be treated is the sewage that has been treated by the grille and the grit chamber to remove the garbage and sediment therein.

Compared with the prior art, the above one or more technical solutions of the present invention have achieved the following beneficial effects:

Aiming at the problems that the existing high-load activated sludge method does not classify and recover various forms of carbon sources, resulting in the loss of a large amount of carbon sources and the low recovery rate of carbon sources in the process, the present invention proposes the concept of classification and recovery of carbon sources in sewage, By adjusting the positions of the sedimentation tank and adsorption tank in the activated sludge process with high load, a pre-sedimentation-post-adsorption process is created to realize the classification and recovery of carbon sources in sewage. After the domestic sewage is treated by the grille and the grit chamber, a large amount of garbage and sediment are removed, and then it enters the pre-sedimentation tank, where the easy-to-precipitate particulate carbon source is precipitated and concentrated at the bottom of the pre-sedimentation tank in the simplest way. Through the discharge and recovery of excess sludge, the colloidal dissolved carbon source that is not easy to precipitate in the effluent of the pre-sedimentation tank occupies the main body, and is mixed with the sludge in the post-adsorption tank and transferred to the sludge phase, which is also discharged in the same way as excess sludge. Recycling, through the innovation of pre-precipitation-post-adsorption process, the classification and recovery of carbon sources can be realized, and the recovery rate of carbon sources in sewage can be effectively improved.

The pre-sedimentation tank recovers the easily precipitated carbon sources in sewage, which can save about 20% of the recovery cost; the post-adsorption tank operates intermittently with micro-oxygen (DO=0.5-1.0mg/L), which can effectively reduce the mineralization of carbon sources by more than 10% , reduce the operating energy consumption by about 30%, and reduce the operating cost by about 15%.

The process uses pre-precipitation-post-adsorption to classify and recover the carbon sources in the sewage under their respective favorable conditions. Compared with the 30%-50% in the prior art, the carbon source recovery rate can be effectively improved by at least 20%.

The process adopts intermittent operation mode, which can effectively reduce aeration energy consumption and reduce operating costs.

Description of drawings

The accompanying drawings forming a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention.

FIG. 1 is a schematic structural diagram of an inverted adsorption precipitation system based on carbon source classification and recovery provided in Example 1 of the present invention.

Among them: 1- Inlet water pump, 2- First water inlet pipe, 3- Inclined plate sedimentation tank, 4- Perforated overflow pipe, 5- Activated sludge adsorption tank, 6- Water outlet pipe, 7- Aeration pump, 8- Micro Hole aeration plate, 9-sludge pump, 10-sludge pipe, 11-outlet pump.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

In the first aspect, the present invention provides an inverted adsorption and sedimentation system based on the classification and recovery of carbon sources, including: a sloping plate sedimentation tank and an activated sludge adsorption tank, wherein,

The bottom of the inclined plate sedimentation tank is funnel-shaped, the lowest end of the bottom is connected with the sludge pipe, the upper part of the middle is provided with a inclined plate, the side is provided with a first water inlet pipe, and the water inlet position is provided with a baffle plate , so that the influent water enters from the middle and lower part of the inclined plate sedimentation tank; a perforated overflow pipe is arranged above the inclined plate;

The activated sludge adsorption tank is filled with activated sludge, one end of the second water inlet pipe is connected with the perforated overflow pipe, and the other end is connected with the lower end of the activated sludge adsorption tank; the lower end of the activated sludge adsorption tank is provided with aeration The bottom is provided with a sludge discharge port, and the water outlet is located in the middle of the activated sludge adsorption tank.

In some embodiments, the aeration pan is a microporous aeration pan.

In some embodiments, the effective volume of the inclined plate sedimentation tank is 40-60% of the activated sludge adsorption tank.

Further, the inclination angle of the inclined plate in the inclined plate sedimentation tank is 50°-70°, preferably 60°.

Further, the distance between the inclined plates in the inclined plate sedimentation tank is 3-5 cm.

Further, the mud bucket volume of the inclined plate sedimentation tank is 15%-25% of the mud bucket volume of the inclined plate sedimentation tank.

In some embodiments, the diameter-to-depth ratio of the activated sludge adsorption tank is 1:6-12, preferably 1:10.

In the second aspect, the present invention provides an inverted adsorption tank precipitation process based on carbon source classification and recovery, comprising the following steps:

The sewage to be treated is first precipitated by the inclined plate sedimentation tank to recover the easy-to-precipitate carbon source, and then the initially purified sewage overflows to the bottom of the activated sludge adsorption tank. Under the adsorption and absorption of the activated sludge, the carbon source in the sewage is recovered. ;

The sewage to be treated is the sewage that has been treated by the grille and the grit chamber to remove the garbage and sediment therein.

The influent of the process of the present invention is ordinary domestic sewage, which has been treated by grids and grit chambers to remove a large amount of garbage and sediment. Colloidal COD is about 35-60mg/L, dissolved COD is about 60-100mg/L, and SS is about 150-200mg/L.

The process of the invention is used for recycling and processing carbon sources in urban domestic sewage, and the recovered carbon sources can be used for anaerobic fermentation production capacity.

The process setting of pre-precipitation-post-adsorption mainly has the following functions: (1) Through the process setting of pre-precipitation-post-adsorption, the easy-to-precipitate carbon source and the difficult-to-precipitate carbon source in the sewage can be separated in their respective advantageous positions. The recovery rate of carbon source can be significantly improved by recycling under the condition of carbon source; (2) the easy-to-precipitate carbon source can be recovered by direct precipitation, which can reduce the carbon source load of the post-adsorption tank while saving the cost of recycling, and free up the post-adsorption The adsorption site of activated sludge in the pool improves the recovery rate of carbon sources that are not easy to precipitate, thereby improving the overall process carbon source recovery rate; (3) The particle size of the carbon source in the sewage after pre-precipitation becomes smaller, and the small particle colloid It can promote activated sludge to convert carbon sources into endogenous organic carbon such as polyhydroxyalkanoates (PHA), and improve the recovery rate of dissolved carbon sources in the process; (4) Improve the recovery rate of carbon sources It can increase the content of carbon sources in excess sludge, thereby increasing the production capacity potential of excess sludge during anaerobic digestion, and promoting the resource and energy conversion of carbon sources in sewage.

Through the pre-precipitation-post-adsorption process setting, the classification and recovery of easy-to-precipitate carbon sources and difficult-to-precipitate carbon sources in sewage are realized. The pre-sedimentation tank greatly reduces the recovery cost of easy-to-precipitate carbon sources. The pool recycles carbon sources that are not easy to precipitate in a targeted manner, which significantly improves the recovery rate of carbon sources in sewage.

In some embodiments, the inoculation concentration of activated sludge in the activated sludge adsorption tank is 4-8 g/L, preferably 6 g/L, and the inoculation volume is half of the effective volume of the activated sludge adsorption tank.

In some embodiments, after aeration, the dissolved oxygen content in the activated sludge adsorption tank is 0.5-2.0 mg/L, preferably 0.5-1.0 mg/L.

In some embodiments, the inverted adsorption tank precipitation process based on carbon source classification and recovery specifically includes the following steps:

Start-up stage: add aerobic activated sludge to the activated sludge adsorption tank, and the sludge is taken from the end of the aerobic tank of the sewage treatment plant; turn on the water, and adopt the SBR operation mode. At this stage, the inclined plate sedimentation tank and the activated sludge The sludge adsorption tank does not discharge excess sludge;

Sludge age debugging stage: using SBR operation mode, the inclined plate sedimentation tank discharges sludge once a day, and the sludge discharge is equivalent to the sludge hopper volume of the sedimentation tank; the activated sludge adsorption tank gradually increases the discharge of excess sludge every day, so that it is Reach the set SRT within 1-2 weeks;

Stable operation stage: When the SRT of the activated sludge adsorption tank reaches the set value stably, it enters the stable operation stage; in this stage, the sewage to be treated is first precipitated in the inclined plate sedimentation tank to recover the easy-to-precipitate carbon source, and then the sewage after preliminary purification It overflows to the bottom of the activated sludge adsorption tank, and under the adsorption and absorption of activated sludge, the carbon source in the sewage is recovered.

Further, the SBR operation of the inclined plate sedimentation tank is divided into two stages: inflow and idle. The inflow stage is 15-25min, and the idle stage is 40-50min.

Further, the SBR operation of the activated sludge adsorption tank is divided into four stages: water inflow, aeration, sedimentation, water effluent and idle. Among them, the water inflow and aeration stages are 15-25min, and the DO is 0.5-1.0mg/L; The precipitation stage is 15-25min; the effluent stage is 15-25min.

Further, the volume exchange rate of the activated sludge adsorption tank is 40-60%, and the idle stage is 4-10min, which is used to discharge excess sludge.

Further, the SRT in the activated sludge adsorption tank is 1-3d.

In some embodiments, the end of the start-up phase is marked when the sludge growth of the activated sludge adsorption tank reaches 0.3-0.5 g/L/d;

In some embodiments, the end of the sludge age debugging phase is marked as the SRT of the continuous 3d activated sludge adsorption tank is 2.5-3.5d, and the sludge concentration in the activated sludge adsorption tank is 2-3 g/L.

In some embodiments, the sludge concentration (MLSS) of the activated sludge adsorption tank is 2-3 g/L, the organic matter concentration in the sludge (MLVSS) is 1.4-2.4 g/L, and the organic matter content in the sludge (MLVSS/MLSS) ) is 0.7-0.8.

The experimental methods described in the examples are conventional methods unless otherwise specified; the reagents and materials can be obtained from commercial sources unless otherwise specified.

Determination method: COD, NH ₃ -N, TN, TP were determined according to standard methods, COD was determined by potassium dichromate method, NH ₃ -N was determined by nano-spectrophotometry, TN was determined by potassium persulfate oxidation-ultraviolet spectrophotometry, TP Molybdenum antimony anti-spectrophotometry was used.

Example 1

As shown in Figure 1, an inverted adsorption and precipitation process based on carbon source classification and recovery, the device composition mainly includes an inlet pump 1, a first water inlet pipe 2, a sloping plate sedimentation tank 3, a perforated overflow pipe 4, and a rear activated sewage Sludge adsorption tank 5, outlet pipe 6, aeration pump 7, microporous aeration plate 8, sludge pump 9, sludge pipe 10 and outlet pump 11.

The front sedimentation tank adopts the inclined plate sedimentation tank 3, and its effective volume is 50% of the effective volume of the rear activated sludge adsorption tank 5. The inclined plate inclination angle is 60°, the distance between the inclined plates is 4 cm, and the volume of the mud bucket is about the same as that of the inclined plate. 20% of the volume of sedimentation tank 3. The effective volume of the rear activated sludge adsorption tank 5 is twice the effective volume of the inclined plate sedimentation tank 3. The diameter-to-depth ratio of the activated sludge adsorption tank 5 is 1:10. The rear activated sludge adsorption tank is an SBR adsorption tank. Entered from the bottom of the pool and discharged from the middle of the pool, the pool contains activated sludge.

An inverted adsorption and precipitation process based on the classification and recovery of carbon sources. It operates intermittently and a cycle lasts 65 minutes: the front inclined plate sedimentation tank is fed for 20 minutes, idle for 45 minutes, and the rear activated sludge adsorption tank is fed with water + aeration for 20 minutes and sedimentation for 20 minutes. , out of water for 20min, idle for 5min. In the water inlet stage, the sewage first enters the inclined plate sedimentation tank to enrich and recycle the carbon sources that are easy to precipitate in the sewage. The effluent from the inclined plate sedimentation tank enters the activated sludge adsorption tank, where it is mixed with the sludge and aerated at the same time. The DO is controlled at 0.5-1 mg. /L, to promote activated sludge adsorption and absorption of carbon sources that are not easy to precipitate in sewage; in the precipitation stage, the mud level of the adsorption tank drops by more than 50% within 20 minutes; in the effluent stage, 50% of the supernatant in the adsorption tank is discharged within 20 minutes; in the idle stage, The excess sludge in the inclined plate sedimentation tank and the adsorption tank is discharged, and the SRT of the inclined plate sedimentation tank is controlled to be 1d, and the SRT of the adsorption tank is 3d. The domestic sewage treated by the process comes from the domestic sewage of a school in the north. The total COD concentration of the influent is 150.3±20.6mg/L, the total COD concentration of the effluent of the inclined plate sedimentation tank is 108.2±14.8mg/L, and the total COD of the effluent of the activated sludge adsorption tank The concentration is 37.5±12.1mg/L. After COD mass balance, the recovery rate of carbon source in the whole process is 60%.

Example 2

An inverted adsorption and precipitation process based on the classification and recovery of carbon sources. It operates intermittently and a cycle lasts 65 minutes: the front inclined plate sedimentation tank is fed for 20 minutes, idle for 45 minutes, and the rear activated sludge adsorption tank is fed with water + aeration for 20 minutes and sedimentation for 20 minutes. , out of water for 20min, idle for 5min. In the water inlet stage, the sewage first enters the inclined plate sedimentation tank to enrich and recycle the carbon sources that are easy to precipitate in the sewage. The effluent from the inclined plate sedimentation tank enters the activated sludge adsorption tank, where it is mixed with the sludge and aerated at the same time. The DO is controlled at 0.5-1 mg. /L, to promote activated sludge adsorption and absorption of carbon sources that are not easy to precipitate in sewage; in the precipitation stage, the mud level of the adsorption tank drops by more than 50% within 20 minutes; in the effluent stage, 50% of the supernatant in the adsorption tank is discharged within 20 minutes; in the idle stage, Discharge the excess sludge in the inclined plate sedimentation tank and the adsorption tank, and control the SRT of the inclined plate sedimentation tank to be 1d and the SRT of the adsorption tank to be 2d. This process treats domestic sewage in a northern city. The total COD concentration of the influent water is 300.6±30.8mg/L, the ammonia nitrogen concentration is 31.8±2.9mg/L, the total nitrogen concentration is 51.6±3.3mg/L, and the total phosphorus concentration is 6.5±1.2 mg/L; the total COD concentration of the effluent of this process is 69.3±15.6mg/L, the ammonia nitrogen concentration is 27.8±2.1mg/L, the total nitrogen concentration is 47.6±2.4mg/L, and the total phosphorus concentration is 5.9±1.3mg/L ; After COD mass balance, the carbon source recovery rate of this process can reach more than 70%.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

An inverted adsorption and sedimentation system based on the classification and recovery of carbon sources, characterized in that it comprises: a sloping plate sedimentation tank and an activated sludge adsorption tank, wherein, The bottom of the inclined plate sedimentation tank is funnel-shaped, the lowest end of the bottom is connected with the sludge pipe, the upper part of the middle is provided with a inclined plate, the side is provided with a first water inlet pipe, and the water inlet position is provided with a baffle plate , so that the influent water enters from the middle and lower part of the inclined plate sedimentation tank; a perforated overflow pipe is arranged above the inclined plate; The activated sludge adsorption tank is filled with activated sludge, one end of the second water inlet pipe is connected with the perforated overflow pipe, and the other end is connected with the lower end of the activated sludge adsorption tank; the lower end of the activated sludge adsorption tank is provided with aeration The bottom is provided with a sludge discharge port, and the water outlet is located in the middle of the activated sludge adsorption tank. The inverted adsorption and sedimentation system based on carbon source classification and recovery according to claim 1, wherein the aeration disk is a microporous aeration disk. The inverted adsorption and sedimentation system based on carbon source classification and recovery according to claim 1, characterized in that: the effective volume of the inclined plate sedimentation tank is 40-60% of the activated sludge adsorption tank; Further, the inclination angle of the inclined plate in the inclined plate sedimentation tank is 50°-70°, preferably 60°; Further, the distance between the inclined plates in the inclined plate sedimentation tank is 3-5cm; Further, the mud bucket volume of the inclined plate sedimentation tank is 15%-25% of the mud bucket volume of the inclined plate sedimentation tank. The inverted adsorption and sedimentation system based on carbon source classification and recovery according to claim 1, characterized in that: the diameter-to-depth ratio of the activated sludge adsorption tank is 1:6-12, preferably 1:10. A kind of inverted adsorption tank precipitation process based on carbon source classification and recovery, is characterized in that: comprises the following steps: The sewage to be treated is first precipitated by the inclined plate sedimentation tank to recover the easy-to-precipitate carbon source, and then the initially purified sewage overflows to the bottom of the activated sludge adsorption tank. Under the adsorption and absorption of the activated sludge, the carbon source in the sewage is recovered. ; The sewage to be treated is the sewage that has been treated by the grille and the grit chamber to remove the garbage and sediment therein. The inverted adsorption tank sedimentation process based on carbon source classification and recovery according to claim 5, characterized in that: the inoculation concentration of activated sludge in the activated sludge adsorption tank is 4-8 g/L, preferably 6 g/L, The inoculation volume is half of the effective volume of the activated sludge adsorption tank. The inverted adsorption tank sedimentation process based on carbon source classification and recovery according to claim 5, characterized in that: after aeration, the dissolved oxygen content in the activated sludge adsorption tank is 0.5-2.0 mg/L, preferably 0.5-2.0 mg/L. 1.0mg/L. The inverted adsorption tank precipitation process based on carbon source classification and recovery according to claim 5, is characterized in that: specifically comprises the following steps: Start-up stage: add aerobic activated sludge to the activated sludge adsorption tank, and the sludge is taken from the end of the aerobic tank of the sewage treatment plant; turn on the water, and adopt the SBR operation mode. At this stage, the inclined plate sedimentation tank and the activated sludge The sludge adsorption tank does not discharge excess sludge; Sludge age debugging stage: using SBR operation mode, the inclined plate sedimentation tank discharges sludge once a day, and the sludge discharge is equivalent to the sludge hopper volume of the sedimentation tank; the activated sludge adsorption tank gradually increases the discharge of excess sludge every day, so that it is Reach the set SRT within 1-2 weeks; Stable operation stage: When the SRT of the activated sludge adsorption tank reaches the set value stably, it enters the stable operation stage; in this stage, the sewage to be treated is first precipitated in the inclined plate sedimentation tank to recover the easy-to-precipitate carbon source, and then the sewage after preliminary purification It overflows to the bottom of the activated sludge adsorption tank, and under the adsorption and absorption of activated sludge, the carbon source in the sewage is recovered; Further, the SBR operation of the inclined plate sedimentation tank is divided into two stages: inflow and idle, the inflow stage is 15-25min, and the idle stage is 40-50min; Further, the SBR operation of the activated sludge adsorption tank is divided into four stages: water inflow, aeration, sedimentation, water effluent and idle. Among them, the water inflow and aeration stages are 15-25min, and the DO is 0.5-1.0mg/L; The precipitation stage is 15-25min; the effluent stage is 15-25min; Further, the volume exchange rate of the activated sludge adsorption tank is 40-60%, and the idle stage is 4-10min, which is used to discharge excess sludge; Further, the SRT in the activated sludge adsorption tank is 1-3d. The inverted adsorption tank sedimentation process based on carbon source classification and recovery according to claim 8, characterized in that: the sign of the end of the start-up stage is that the sludge growth in the activated sludge adsorption tank reaches 0.3-0.5g/L/d, and the sludge The sign of the end of the ageing debugging stage is that the SRT of the continuous 3d activated sludge adsorption tank is 2.5-3.5d, and the sludge concentration in the activated sludge adsorption tank is 2-3g/L. The inverted adsorption tank sedimentation process based on carbon source classification and recovery according to claim 8, characterized in that: the sludge concentration of the activated sludge adsorption tank is 2-3g/L, and the organic matter concentration in the sludge is 1.4-2.4g/L. L, the organic matter content in the sludge is 0.7-0.8.

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