CN115806345B - Composite microorganism system and method for runoff sewage in-situ treatment - Google Patents
Composite microorganism system and method for runoff sewage in-situ treatment Download PDFInfo
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Abstract
The invention relates to the technical field of water environment treatment, in particular to a composite microorganism system and method for in-situ treatment of runoff sewage. The invention provides a composite microbial system for in-situ treatment of runoff sewage, which comprises a regulating reservoir, a microbial reactor and a controller, wherein a drainage pump and a flowmeter which are respectively and correspondingly connected with the controller are arranged on a pipeline between the regulating reservoir and the microbial reactor, the controller can determine drainage flow of the regulating reservoir by utilizing a preset converging-converging model based on latest rainfall data, predicted rainfall data and water storage data of the regulating reservoir, and the drainage pump and the flowmeter are controlled to convey the runoff sewage in the regulating reservoir to the microbial reactor according to the drainage flow so as to enable the drainage period of the regulating reservoir to be suitable for the predicted rainfall period. The composite microbial system can realize that the microbial reactor has uniform water inflow in a rainfall period, so that the activity of internal microorganisms is kept, and the microbial reactor can be ensured to immediately recover to stably operate after rainfall.
Description
Technical Field
The invention relates to the technical field of water environment treatment, in particular to a composite microorganism system and method for in-situ treatment of runoff sewage.
Background
The runoff pollution mainly comprises initial rainwater pollution and combined overflow pollution, a large amount of pollutants are carried in the initial rainwater pollution and combined overflow pollution, and can be directly discharged into water bodies such as river channels and lakes through a drainage pipe network to cause urban water environment pollution, so that the urban water bodies are subjected to phenomena such as 'black and odor prevention' and 'repeated pollution' in rainy days, and the method is an engineering technical problem which needs to be solved in the long time in the current and future.
Current general ideas for runoff pollution control include: source decrement, process regulation and end control. Wherein, terminal control generally adopts the regulation pond to keep in, and rethread pipe network is discharged sewage treatment plant and domestic sewage and is merged the processing, belongs to the ectopic and handles. The ectopic treatment mode is easy to cause impact on the water quantity and water quality of the sewage treatment plant, and affects the stable operation of the sewage treatment plant; meanwhile, the off-site treatment mode means that a conveying pipe network needs to be built again, so that the construction cost is greatly increased, and the construction condition is not met in the area lacking a sewage treatment plant.
In situ treatment overcomes the above problems well compared to ex situ treatment. The in-situ treatment technology of runoff pollution mainly adopts a physical method and a chemical method, such as a suspended filler adsorption technology (CN 101734804A), a high-efficiency coagulation clarification technology (CN 102139946A), a loading coagulation purification technology (CN 109336334A) and the like, and can rapidly and efficiently reduce pollutants such as Suspended Substances (SS), total Phosphorus (TP), insoluble COD and the like in a water body. However, these physical and chemical methods are not effective in removing such as SCOD, NH 3 -soluble contaminants such as N. The treatment methods for plants, ecology and the like, such as a rainwater garden (CN 107288198B), an ecological floating island (CN 215288414U), an ecological oxidation pond (CN 206384982U), an ecological grass planting ditch (CN 209161783U), a sinking green land (CN 106759797B) and the like, have extremely low treatment efficiency and large occupied area compared with the microbial treatment method using activated sludge or a biological film, and are generally difficult to be applied on a large scale as auxiliary treatment means.
The adoption of the microbial treatment method of activated sludge or biological membrane can efficiently and economically remove the soluble pollutants in the runoff sewage. However, the microbial treatment method greatly depends on microbial activity, and runoff pollution is caused by rainfall, and under the condition that no rainfall exists for a long time, the microbial treatment system is easy to maintain microbial activity all the time due to water shortage, and can not respond to the runoff pollution immediately after rainfall to restore stable operation. Some of the prior art discloses that the traditional sewage treatment technology is applied to in-situ treatment of runoff pollution, such as CN109368910A, CN111392964A, CN107522360A, CN215288414U, and although some improvements are made on the aspects of coping with water fluctuation and impact, the essential problems that a microbial treatment system cannot always keep activity due to water shortage in a non-raining period and cannot immediately recover operation stability when runoff is generated due to raining are not fundamentally solved, so that the microbial treatment system cannot realize stable standard-reaching operation under the condition of no water inflow or little water inflow for a long time (> 2 weeks) and is only suitable for being applied to some special scenes.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that the microorganism activity is difficult to maintain under the condition of no rainfall for a long time and the stable operation cannot be recovered by immediately responding to the runoff pollution after rainfall by the runoff pollution microorganism treatment method in the prior art, thereby providing a compound microorganism system and a method for the runoff sewage in-situ treatment.
The invention provides a composite microbial system for in-situ treatment of runoff sewage, which comprises a regulating reservoir, a microbial reactor and a controller, wherein a water outlet of the regulating reservoir is communicated with a water inlet of the microbial reactor through a pipeline, a drainage pump and a flowmeter are arranged on the pipeline, and the controller is correspondingly connected with the drainage pump and the flowmeter respectively;
the controller is used for determining the drainage flow of the regulating reservoir by utilizing a preset yield and confluence model based on the latest rainfall data, the predicted rainfall data and the water storage data of the regulating reservoir, controlling the drainage pump and the flowmeter according to the drainage flow, and conveying the runoff sewage in the regulating reservoir to the microbial reactor so as to enable the drainage period of the regulating reservoir to be suitable for the predicted rainfall period;
The microbial reactor is used for carrying out microbial treatment on the runoff sewage flowing into the microbial reactor and generating activated sludge.
Optionally, the composite microbial system further comprises: a sludge activation tank for storing the activated sludge produced in the microbial reactor;
the inlet of the sludge activation tank is communicated with the sludge outlet of the microbial reactor through a first sludge pump, and the outlet of the sludge activation tank is communicated with the sludge inlet of the microbial reactor through a second sludge pump;
the second sludge pump is correspondingly connected with the controller, and the controller is also used for controlling the second sludge pump to convey the activated sludge stored in the sludge activation tank to the microbial reactor when the water inflow of the microbial reactor in a preset time period is less than a preset value.
Optionally, the sludge activation tank comprises a sludge concentration zone and a sludge activation zone which are communicated with each other, an inlet of the sludge activation tank is positioned on the wall of the sludge concentration zone, and an outlet of the sludge activation tank is positioned on the wall of the sludge activation zone;
optionally, a water skimming device is arranged in the sludge concentration area and used for dehydrating and concentrating the activated sludge in the sludge concentration area;
Optionally, a stirring device is arranged in the sludge activation zone and is used for activating the concentrated sludge in the sludge activation zone.
Optionally, the microbial reactor comprises a sedimentation zone, a facultative adsorption zone and an aerobic reaction zone which are sequentially communicated, wherein the bottom of the facultative adsorption zone is a first sludge bucket, the bottom of the aerobic reaction zone is a second sludge bucket, and the second sludge bucket is communicated with the facultative adsorption zone through a third sludge pump;
the water inlet of the microbial reactor is positioned on the wall of the sedimentation zone, the sludge outlet of the microbial reactor is positioned on the wall of the first sludge bucket, and the sludge inlet of the microbial reactor is positioned on the wall of the second sludge bucket;
optionally, the sedimentation zone is used for sedimentation to remove the granular pollutants in the runoff sewage, an inclined plate for sedimentation attachment of the granular pollutants is arranged in the sedimentation zone, and a fourth sludge pump for discharging the granular pollutants is arranged at the bottom of the sedimentation zone;
optionally, the facultative adsorption zone is used for performing facultative adsorption treatment on the runoff sewage, activated sludge containing microorganisms is suspended in the facultative adsorption zone, and a perforated pipe for aeration and/or stirring is arranged at the bottom of the facultative adsorption zone; optionally, the concentration of suspended solids of the mixed solution in the facultative adsorption zone is 2000-4000 mg/L;
Optionally, the aerobic reaction zone is used for carrying out aerobic reaction treatment on the runoff sewage, the interior of the aerobic reaction zone is filled with carrier materials attached with microorganisms, and an aeration device is arranged at the bottom of the aerobic reaction zone; optionally, the filling volume of the carrier material accounts for 60-80% of the internal volume of the aerobic reaction zone.
Optionally, the last rainfall data includes a last rainfall amount, a last rainfall intensity, and a last rainfall duration; the predicted rainfall data comprises a predicted rainfall amount, a predicted rainfall intensity, a predicted rainfall duration, a predicted rainfall period and a predicted rainfall probability; the regulation pool water storage data comprise regulation pool liquid level and/or regulation pool converging flow.
Optionally, the composite microbial system further comprises: the hydrological weather station is correspondingly connected with the controller and is used for acquiring the latest rainfall data, the predicted rainfall data and the storage water data of the regulating reservoir and sending the latest rainfall data, the predicted rainfall data and the storage water data of the regulating reservoir to the controller;
optionally, the hydrokinetic station comprises: the rain gauge is used for acquiring the latest rainfall data; the communicator is used for acquiring the rainfall prediction data; the regulation and storage Chi Huiliu flowmeter is used for acquiring the confluence flow of the regulation and storage tanks; and the regulation and storage tank water level gauge is used for acquiring the liquid level of the regulation and storage tank.
The invention also provides a method for in-situ treatment of runoff sewage, which comprises the following steps:
determining the drainage flow of the regulating reservoir by utilizing a preset yield converging model based on the latest rainfall data, the predicted rainfall data and the water storage data of the regulating reservoir;
delivering the runoff sewage in the regulating reservoir to a microbial reactor based on the drainage flow rate so as to perform microbial treatment;
and the drainage period of the regulating reservoir is adapted to the predicted rainfall period based on the drainage flow.
Optionally, the method further comprises: the activated sludge generated by the microbial treatment is sent to a sludge activation tank for storage; and
and re-feeding at least part of the activated sludge stored in the sludge activation tank into the microbial reactor when the water inflow of the microbial reactor is less than a preset value in a preset time period.
Optionally, the microbial processor includes a sedimentation zone, a facultative adsorption zone and an aerobic reaction zone, and the step of conveying the runoff sewage in the regulation tank to the microbial reactor for microbial treatment includes:
conveying the runoff sewage in the regulating reservoir to the sedimentation zone, and settling the granular pollutants in the runoff sewage under the action of a flocculating agent;
Enabling the first supernatant fluid after the sedimentation in the sedimentation zone to enter the facultative adsorption zone, and performing facultative adsorption treatment under the action of microorganisms in suspended activated sludge in the facultative adsorption zone;
enabling the second supernatant liquid after the facultative adsorption treatment in the facultative adsorption zone to enter the aerobic reaction zone, and carrying out aerobic reaction treatment under the action of microorganisms in the aerobic reaction zone.
Optionally, the method further comprises: sending the activated sludge generated by the facultative adsorption treatment into a sludge activation tank for storage; and/or discharging the third supernatant after the aerobic reaction treatment into a storage water body; and/or, sending the activated sludge generated by the aerobic reaction treatment into the facultative adsorption zone for the facultative adsorption treatment.
Optionally, in the sedimentation zone, the sedimentation time for the runoff sewage to sediment is 0.3-0.5 h. The type of flocculant used in the sedimentation zone and its concentration may be set as is conventional in the art and will not be described in detail herein.
And/or, in the facultative adsorption zone, the facultative adsorption treatment conditions include at least one of the following a-c:
a. the suspension solid concentration of the mixed solution in the facultative adsorption zone is 2000-4000 mg/L;
b. Maintaining the dissolved oxygen concentration in the facultative adsorption zone to be 0.5-1 mg/L;
c. the facultative adsorption treatment time is 0.5-1.0 h.
And/or, in the aerobic reaction zone, the conditions of the aerobic reaction treatment comprise at least one of the following d to f:
d. the filling volume of the carrier material in the aerobic reaction zone accounts for 60-80% of the internal volume of the aerobic reaction zone;
e. maintaining the concentration of dissolved oxygen in the aerobic reaction zone to be 1.5-3.0 mg/L;
f. the time of the aerobic reaction treatment is 4-6 hours.
Optionally, the determining the drainage flow of the regulation pool by using a preset confluence model based on the latest rainfall data, the predicted rainfall data and the water storage data of the regulation pool includes:
based on the latest rainfall data, a preset yield and confluence model is utilized to determine a predicted confluence amount V to be pooled in the regulation pool 1 Predicting a confluence duration T m ；
Based on the predicted sink volume V 1 Predicting confluence duration T m Predicted rainfall period T 1 Effective capacity V of regulating reservoir 0 Determining the drainage flow Q of the regulating reservoir within a preset time length T 1 ；
Optionally, the preset duration T is a duration from the current time point to the predicted rainfall time point.
Optionally, the method comprises the step of calculating a predicted aggregate flow V based on the prediction 1 Predicting confluence duration T m Predicted rainfall period T 1 Effective capacity V of regulating reservoir 0 Determining the drainage flow Q of the regulating reservoir within a preset time length T 1 Comprising:
at T is less than or equal to T m In the case of Q 1 ＝(V 1 -V 0 )/T m ；
At T m <T≤T 1 In the case of Q 1 ＝V 0 /T 1 。
At T is less than or equal to T m In the case of continuous rainfall, it is indicated that runoff is produced, the primary task is to ensure that no overflow of the storage tank occurs, i.e. that the storage tank is able to fill, and the flow-through wastewater is fed into the microbial reactor, so that Q 1 ＝(V 1 -V 0 )/T m The method comprises the steps of carrying out a first treatment on the surface of the At Tm<T≤T 1 In the case of (1), it is indicated that no rainfall runoff is generated for a long period of time, and the reservoir is already filled with runoff sewage in the last rainfall period, therefore, Q 1 ＝V 0 /T 1 。
The technical scheme of the invention has the following advantages:
1. the invention provides a composite microbial system for in-situ treatment of runoff sewage, which comprises a regulating reservoir, a microbial reactor and a controller, wherein a drainage pump and a flowmeter which are respectively and correspondingly connected with the controller are arranged on a pipeline between the regulating reservoir and the microbial reactor, the controller can determine drainage flow of the regulating reservoir by utilizing a preset converging-converging model based on latest rainfall data, predicted rainfall data and water storage data of the regulating reservoir, and the drainage pump and the flowmeter are controlled to convey the runoff sewage in the regulating reservoir to the microbial reactor according to the drainage flow so as to enable the drainage period of the regulating reservoir to be suitable for the predicted rainfall period.
That is, the controller can regulate and control the drainage time and the drainage amount of the regulating reservoir in real time based on the information data, so that the microbial reactor can uniformly feed water in a rainfall period, the situation that water is lack in the microbial reactor due to long-time (for example, 2-4 weeks) rainfall-free is effectively avoided, microorganisms in the microbial reactor can keep microbial activity under the long-time rainfall-free condition, and further, the microbial reactor can respond to runoff pollution immediately after rainfall to recover stable operation.
2. The invention provides a composite microorganism system for in-situ treatment of runoff sewage, which further comprises a sludge activation tank, wherein an inlet of the sludge activation tank is communicated with a sludge outlet of a microorganism reactor through a first sludge discharge pump, an outlet of the sludge activation tank is communicated with a sludge inlet of the microorganism reactor through a second sludge discharge pump, the second sludge discharge pump is correspondingly connected with a controller, and the controller can control the second sludge discharge pump to convey activated sludge stored in the sludge activation tank into the microorganism reactor under the condition that the water inflow of the microorganism reactor is less than a preset value within a preset time period, and the nutrient is insufficient due to no water inflow or less water inflow within the microorganism reactor for a long time period.
Therefore, the composite microbial system can realize that the activated sludge generated in the microbial reactor is sent into the sludge activation tank for storage in a rainfall period, and when the activity attenuation of the microorganisms in the microbial processor occurs due to lack of nutrient substances caused by no or little water inlet for a long time, the activated sludge stored in the sludge activation tank is re-conveyed into the microbial reactor, and the nutrient substances adsorbed by the activated sludge are used as supplements so as to recover or maintain the activity of the microorganisms, so that the rainfall uncertainty and the influence of the rainfall period uncertainty on the activity of the microorganisms can be reduced to the greatest extent.
3. The composite microorganism system for in-situ treatment of runoff sewage provided by the invention comprises a sludge concentration area and a sludge activation area which are mutually communicated, wherein the sludge concentration area can be used for dewatering and concentrating sludge entering the sludge concentration area so as to be convenient for storage, and the sludge activation area can be used for carrying out activation treatment on the sludge to be discharged from the sludge activation area so as to recover or maintain the activity of the sludge.
Therefore, in the composite microbial system, the sludge activation tank can concentrate and store the activated sludge under the condition that the microbial processor does not need the activated sludge, and the activity of the concentrated sludge is recovered when the microbial reactor needs the activated sludge, so that the activity of the sludge re-discharged into the microbial reactor can be ensured, the storage capacity of the sludge activation tank can be improved, and the occupied area of the sludge activation tank can be reduced.
4. The microbial reactor comprises a sedimentation zone, a facultative adsorption zone and an aerobic reaction zone which are sequentially communicated, wherein the sedimentation zone can sediment and remove granular pollutants in the runoff sewage, microorganisms in suspended sludge in the facultative adsorption zone can adsorb soluble pollutants in the runoff sewage through adsorption and form new activated sludge, and microorganisms in carrier materials in the aerobic reaction zone can remove the soluble pollutants in the runoff sewage through aerobic biological reaction and form the activated sludge.
Therefore, in the composite microorganism system, aiming at the water quality characteristics of the runoff sewage, the microorganism reactor can sequentially carry out sedimentation, facultative adsorption and aerobic biological reaction on the runoff sewage, the treatment efficiency of microorganisms on soluble pollutants is improved by combining a grading composite treatment mode of materialization pretreatment (sedimentation), the biodegradation effect of microorganisms is fully exerted, the materialization pretreatment is enhanced, the residence time of the reactor of the runoff sewage is shortened, the high-efficiency removal of the soluble pollutants is realized while the granular pollutants are removed, and COD and NH are removed 3 The removal rate of the pollutants such as N, TP can reach 90 percent. In addition, by constructing a composite microorganism system of the immobilized carrier and the activated sludge, a hierarchical composite treatment mode is adopted, the reaction procedures are more, and the accommodability of the reactor to water quantity and the adaptability to water quality can be improved, so that the composite microorganism system disclosed by the invention can adapt to and cope with the impact of different water quantities and water quality.
5. The composite microbial system or the method for in-situ treatment of runoff sewage solves the core problem of keeping the microbial activity of the composite microbial treatment system under the condition of no rainfall period and no runoff (for example, 2 weeks) for a long time, can adapt to the condition of continuous no rainfall of 90% days in most cities all year round, and solves the problem that the sludge activity is difficult to maintain in the existing runoff pollution biological treatment technology. The composite microorganism system or the method is specially designed aiming at the characteristics of runoff pollution, the total treatment time of the runoff sewage is only 5-7h, the treatment efficiency is high, the occupied area of the related equipment is small, the occupied area is only 1/10 compared with in-situ ecological treatment, the occupied area is only 1/3-1/2 compared with an ex-situ sewage treatment plant, and the site and equipment investment can be greatly saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 schematically illustrates one embodiment of a composite microbial system for in situ treatment of runoff sewage in accordance with the present invention;
FIG. 2 schematically illustrates another embodiment of a composite microbial system for in situ treatment of runoff sewage according to the present invention;
FIG. 3 schematically illustrates an alternative embodiment of a microbial reactor according to the present invention;
FIG. 4 schematically shows a control logic diagram of the composite microbial system of the present invention.
Reference numerals:
1. regulating reservoir 2, microbial reactor 3, controller 3
4. Sludge activation tank 5, hydrological station 101, and drainage pump
102. Flowmeter 201, first sludge pump 202, second sludge pump
203. A third dredge pump 204, a sedimentation zone 205 and a facultative adsorption zone
206. Aerobic reaction zone 207, first sludge hopper 208, second sludge hopper
209. Swash plate 210, fourth sludge pump 211, perforated pipe
212. Carrier material 213, aeration device 401, sludge concentration zone
402. Sludge activation region 403, skimming device 404, and stirring device
501. Flowmeter for rain gauge 502, communicator 503 and regulation Chi Huiliu
504. Water level gauge of regulating reservoir
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
Fig. 1 schematically shows a specific embodiment of the composite microorganism system for in-situ treatment of runoff sewage, which comprises a regulating reservoir 1, a microorganism reactor 2 and a controller 3, wherein the water outlet of the regulating reservoir 1 is communicated with the water inlet of the microorganism reactor 2 through a pipeline, a drainage pump 101 and a flowmeter 102 are arranged on the pipeline, and the controller 3 is correspondingly connected with the drainage pump 101 and the flowmeter 102 respectively; the controller 3 is configured to determine a drainage flow rate of the regulation tank 1 by using a preset yield and concentration model based on the latest rainfall data, the predicted rainfall data and the regulation tank water storage data, and control the drainage pump 101 and the flowmeter 102 according to the drainage flow rate, so as to convey the runoff sewage in the regulation tank 1 to the microbial reactor 2, so that a drainage period of the regulation tank 1 is adapted to the predicted rainfall period; the microbial reactor 2 is used for carrying out microbial treatment on the runoff sewage flowing into the microbial reactor and generating activated sludge.
In the above composite microbial system, the regulating reservoir 1 is used for storing polluted runoff sewage, the microbial reactor 2 is used for performing microbial treatment on the runoff sewage discharged from the regulating reservoir 1, the controller 3 is used for controlling and regulating the drainage flow of the regulating reservoir 1 discharged into the microbial reactor 2 in real time based on the latest rainfall data, the predicted rainfall data, the water storage data of the regulating reservoir and other data, and the combination of the confluence model and the algorithm, so that the drainage period (such as the emptying period) of the regulating reservoir 1 is identical with one predicted rainfall period, and the situation of water shortage inside the microbial reactor 2 caused by long-time (such as 2-4 weeks) rainfall-free is avoided. In the microbial reactor 2, pollutants in the runoff sewage, such as COD, ammonia Nitrogen (NH) 3 -N), total Phosphorus (TP), suspended Solids (SS), etc., are removed by complex microbial action.
Specifically, the regulation tank 1 can be a conventional water storage tank and can be built according to a common method in the field; the microorganism reactor 2 can be a hollow container with microorganism carriers attached in a suspending way, and can be constructed according to a conventional method in the field; the controller 3 is a model algorithm and a control system, and may specifically be a processor with communication and operation functions.
The yield and confluence model can infer the runoff distribution form and the movement state in the river basin after rainfall output according to the input information such as confluence flow, rainfall duration, runoff coefficient, water collection area and the like, and particularly predicts the quantity of the surface, soil and underground yield and the confluence movement state of the surface, soil and underground yield, so as to respectively predict the confluence flow and the confluence duration. Illustratively, in the present invention, the confluence model may be expressed by the following formula:
in the above formula, V represents a predicted sink amount, m 3 ；Q t Represents the actual measured confluence flow at t, m 3 /s；T 1 Representing a predicted rainfall duration; ψ represents the runoff coefficient; a represents a water collecting area, 10 4 m 2 ；r t The measured rainfall intensity at t is expressed in mm/s; t (T) 2 Representing a predicted confluence duration; 0.001 is the unit conversion factor.
Fig. 2 schematically illustrates another embodiment of the composite microbial system for in situ treatment of runoff sewage according to the present invention, the composite microbial system further comprising: a sludge activation tank 4 for storing the activated sludge produced in the microbial reactor 2; the inlet of the sludge activation tank 4 is communicated with the sludge outlet of the microbial reactor 2 through a first sludge discharge pump 201, and the outlet of the sludge activation tank 4 is communicated with the sludge inlet of the microbial reactor 2 through a second sludge discharge pump 202; the second sludge pump 202 is correspondingly connected to the controller 3, and the controller 3 is further configured to control the second sludge pump 202 to convey the activated sludge stored in the sludge activation tank 4 to the microbial reactor 2 when the water inflow of the microbial reactor 2 in a preset time period is less than a preset value.
In the above-mentioned composite microbial system, when the treated water amount of the microbial reactor 2 is large under different rainfall intensities, a large amount of redundant activated sludge is generated, and is discharged into the sludge activation tank 4 through the first sludge discharge pump 201 for storage, when the microbial reactor 2 is not fed with water or is fed with water little for a long time, and when the efficient treatment cannot be realized due to the attenuation of the activity of the internal microorganisms, the internal sludge is activated by aeration of the sludge activation tank 4 at this time, and then is discharged into the microbial reactor 2 through the second sludge discharge pump 202, and the activity of the microorganisms in the microbial reactor 2 is maintained by using nutrient substances adsorbed by the activated sludge as supplement.
In an exemplary manner, the sludge activation tank 4 includes a sludge concentration zone 401 and a sludge activation zone 402 that are in communication with each other, an inlet of the sludge activation tank 4 being located on a wall of the sludge concentration zone 401, and an outlet of the sludge activation tank 4 being located on a wall of the sludge activation zone 402. Optionally, a water skimming device 403 is disposed in the sludge concentration area 401, and is used for dewatering and concentrating the activated sludge in the sludge concentration area 401. Alternatively, a stirring device 404 is disposed in the sludge activation zone 402, and is used for activating the concentrated sludge in the sludge activation zone 402.
In the composite microorganism system, the sludge activation tank 4 is connected with the microorganism reactor 2, and is divided into two areas of a sludge concentration area 401 and a sludge activation area 402 by an internal baffle plate, and the two areas are communicated through holes at the bottom of the baffle plate. A skimming device 403 is arranged in the sludge concentration area 401 and is used for rapidly dehydrating activated sludge to form high-concentration sludge, and the high-concentration sludge is discharged into the sludge activation area 402 through the static pressure of holes at the bottom of the baffle plate. A stirring device 404 is provided in the sludge activation zone 402 for maintaining or restoring the microbial activity of the sludge. When the regulating reservoir 1 is fed into the microbial reactor 2, adsorbed sludge is formed in the microbial reactor 2 and discharged into a sludge concentration zone 401 in the sludge activation tank 4; when the microbial reactor 2 does not or little water enters for a long time, activated sludge in the sludge activation zone 402 in the sludge activation tank 4 is intermittently discharged into the microbial reactor 2 through the second sludge discharge pump 202 in a mode set by the controller 3, and the basic growth requirement of microorganisms in the microbial reactor 2 is maintained by using nutrients adsorbed in the activated sludge, thereby ensuring the microbial activity in the microbial reactor 2.
In another example manner, the microbial reactor 2 includes a sedimentation zone 204, a facultative adsorption zone 205 and an aerobic reaction zone 206 that are sequentially communicated, wherein the bottom of the facultative adsorption zone 205 is a first sludge bucket 207, the bottom of the aerobic reaction zone 206 is a second sludge bucket 208, and the second sludge bucket 208 is communicated with the facultative adsorption zone 205 through a third sludge pump 203; the water inlet of the microbial reactor 2 is located on the wall of the sedimentation zone 204, the sludge outlet of the microbial reactor 2 is located on the wall of the first sludge hopper 207, and the sludge inlet of the microbial reactor 2 is located on the wall of the second sludge hopper 208.
FIG. 3 schematically illustrates an alternative embodiment of the microbial reactor according to the present invention, as shown in FIG. 3, the sedimentation zone 204 is configured to sediment and remove particulate pollutants in the runoff sewage, an inclined plate 209 is disposed inside for sedimentation and adhesion of the particulate pollutants, and a fourth sludge pump 210 is disposed at the bottom for discharging the particulate pollutants; the facultative adsorption zone 205 is used for performing facultative adsorption treatment on the runoff sewage, activated sludge containing microorganisms is suspended in the facultative adsorption zone, and a perforated pipe 211 for aeration and/or stirring is arranged at the bottom of the facultative adsorption zone; the aerobic reaction zone 206 is used for performing aerobic reaction treatment on the runoff sewage, the interior of the aerobic reaction zone is filled with carrier material 212 attached with microorganisms, and an aeration device 213 is arranged at the bottom of the aerobic reaction zone. Optionally, the mixed liquor suspended solids concentration in the facultative adsorption zone 205 is 2000-4000 mg/L, and the filling volume of the carrier material 212 occupies 60-80% of the internal volume of the aerobic reaction zone 206.
In the above-mentioned composite microorganism system, the water inlet end of the microorganism reactor 2 is a sedimentation zone 204 for rapid sedimentation to remove particulate pollutants in the runoff sewage, an inclined plate 209 is disposed in the sedimentation zone 204, and a fourth sludge pump 210 is disposed at the bottom for discharging the sedimented insoluble pollutants.
The facultative adsorption zone 205 is connected with the sedimentation zone 204, and the interior is refluxed by the aerobic reaction zone 206 and carries microorganismsThe suspended activated sludge, the suspension solid concentration of the mixed solution is 2000-4000mg/L, and a perforated pipe 211 is arranged in the mixed solution for intermittent aeration and stirring, so that the Dissolved Oxygen (DO) in the facultative adsorption zone 205 is kept to be 0.5-1mg/L. The microorganisms in the suspended activated sludge adsorb the dissolved COD and NH in the runoff sewage 3 Contaminants such as N, TP are adsorbed, and are precipitated in the first sludge hopper 207 during intermittent aeration of the perforated pipe 211, and are discharged into the sludge activation tank 4 by the first sludge discharge pump 201.
The aerobic reaction zone 206 is connected with the facultative adsorption zone 205, the aerobic reaction zone 206 is filled with spherical immobilized carrier material 212 attached with microorganisms, the filling ratio is 60-80%, and the bottom is provided with an aeration device 213 (for example, a disc-type microporous aerator). The microorganisms attached to the carrier material 212 undergo an aerobic biological reaction to remove dissolved COD and NH in the runoff sewage 3 N, TP, and the like, the activated sludge is deposited in the second sludge hopper 208 and is periodically discharged into the facultative adsorption zone 205 by the third sludge pump 203, and the clean water purified in the aerobic reaction zone 206 is discharged into the storage water body by the water outlet weir (upper right corner in the drawing).
In the embodiment of the present invention, the last rainfall data may include at least one of a last rainfall amount, a last rainfall intensity, and a last rainfall duration; the predicted rainfall data may include at least one of a predicted rainfall amount, a predicted rainfall intensity, a predicted rainfall duration, a predicted rainfall period, and a predicted rainfall probability; the regulation reservoir water storage data may include regulation reservoir liquid level and/or regulation reservoir sink flow. Wherein, the last rainfall refers to the one closest to the current time point, such as the last rainfall, or the current rainfall.
In another example manner, the composite microbial system may further comprise: and the hydrological weather station 5 is correspondingly connected with the controller 3 and is used for acquiring the latest rainfall data, the predicted rainfall data and the storage tank water storage data and sending the latest rainfall data, the predicted rainfall data and the storage tank water storage data to the controller 3. Alternatively, the hydrokinetic station 5 comprises: a rain gauge 501 for acquiring the latest rainfall data; a communicator 502 for acquiring the predicted rainfall data; a regulation Chi Huiliu flowmeter 503, configured to obtain the flow rate of the mixed flow of the regulation tanks; a reservoir level gauge 504 for obtaining the reservoir level.
In the above-mentioned composite microbial system, the rain gauge 501, the communicator 502, the flow meter 503 for regulation Chi Huiliu, and the water level meter 504 for regulation tank may be respectively connected to the controller 3, and the collected related data may be uploaded to the controller 3 in real time.
In the invention, the controller 3 is used for controlling the operation modes of the microbial reactor 2 and the sludge activation tank 4, and controlling the microbial reactor 2 to operate when the regulation tank 1 is filled with water so that the generated activated sludge is discharged into the sludge activation tank 4; when the microorganism reactor 2 does not enter water or enters water little for a long time to cause insufficient nutrients, the sludge activation tank 4 is controlled to activate sludge and intermittently discharge the activated sludge into the aerobic reaction zone 206 of the microorganism reactor 2, and the nutrients in the discharged activated sludge and microorganisms in the aerobic reaction zone 206 are subjected to biochemical reaction, so that the activity of the microorganisms is maintained. Illustratively, FIG. 4 schematically shows a control logic diagram of the composite microbial system of the present invention.
Example 2
In the case of continuous rainfall confluence, the in-situ treatment of runoff sewage was performed using the composite microbial system described in example 1 as follows:
(1) When continuous rainfall produces runoff, in the hydrological weather station, rainfall data such as rainfall, rainfall intensity, rainfall duration and the like are monitored in real time by utilizing a rainfall gauge, the flow rate of production and convergence flowing into the interior of the regulation and storage tank is monitored in real time by utilizing a regulation and storage tank water level gauge, the liquid level in the regulation and storage tank is monitored in real time by utilizing a communicator, and data such as predicted rainfall, predicted rainfall intensity, predicted rainfall duration, predicted rainfall period, predicted rainfall probability and the like in weather forecast are received by utilizing a communicator, and the data information is transmitted to a controller;
(2) Based on a built-in yield and confluence model, the controller simulates and calculates a predicted confluence rate V to be pooled into the regulation pool under the rainfall condition 1 Predicting a confluence duration T m ；
(3) Controller based on predicted sink volume V 1 Predicting confluence duration T m Prediction ofPeriod T of rainfall 1 Effective capacity V of regulating reservoir 0 Determining the drainage flow Q of the regulating reservoir within a preset time length T 1 ：
Because the continuous rainfall produces runoff, T is less than or equal to T m The primary task is to ensure that the regulation reservoir does not overflow in the full condition, therefore, Q 1 ＝(V 1 -V 0 )/T m ；
(4) The controller controls the flow rate Q according to the water discharge 1 The drainage pump and the flowmeter are controlled to convey the runoff sewage in the regulating reservoir to a sedimentation area of the microbial reactor, the runoff sewage stays in the sedimentation area for 0.5h, and under the action of adding a flocculating agent, the granular pollutants in the runoff sewage are precipitated on the sloping plate, and the granular COD and NH are obtained 3 N, TP, etc. are removed;
(5) After the sedimentation is finished, the first supernatant fluid at the upper part of the sloping plate flows into a facultative adsorption zone (MLSS concentration is 2000-4000mg/L, dissolved oxygen is kept to be 0.5-1 mg/L), and stays in the facultative adsorption zone for 0.5h, and the facultative adsorption treatment is carried out under the action of microorganisms in suspended activated sludge in the facultative adsorption zone, so that partial dissolved COD and NH are obtained 3 N, TP and the like to form new activated sludge, and precipitating in the first sludge hopper during intermittent aeration, wherein the pollutant removal rate can reach 40-60%;
(6) After the facultative adsorption treatment is finished, the remaining second supernatant fluid enters an aerobic reaction zone (carrier material filling ratio is 60-80%, MLSS concentration is 2000-4000mg/L, dissolved oxygen concentration is 1.5-3.0 mg/L) and stays for 4-6h, and the aerobic reaction treatment is carried out on microorganisms in the aerobic reaction zone and the dissolved COD and NH in runoff sewage 3 -N, TP, and the like, to further remove contaminants, to produce an activated sludge precipitate in the bottom second sludge hopper, and to discharge the purified third supernatant into the receiving water body through the effluent weir;
(7) And the activated sludge deposited in the second sludge hopper is periodically discharged into the facultative adsorption area through a third sludge discharge pump, the activated sludge deposited in the first sludge hopper is discharged into a sludge concentration area of a sludge activation tank through the first sludge discharge pump, supernatant is rapidly skimmed by a skimming device, and the obtained high-concentration sludge is discharged into the sludge activation area through static pressure of a bottom through hole, so that the microbial activity is maintained under the action of a stirrer.
Example 3
Under the condition that rainfall runoff is not generated for a long time, the composite microorganism system described in the embodiment 1 is utilized to carry out in-situ treatment of runoff sewage according to the following method:
(1) When rainfall runoff is not generated for a long time, the communicator receives data such as predicted rainfall, predicted rainfall intensity, predicted rainfall duration, predicted rainfall period, predicted rainfall probability and the like in weather forecast, transmits the data to the controller, and calculates the next predicted rainfall period T by the controller 1 Provided T 1 ＝14d；
(2) In the hydrological weather station, rainfall data such as rainfall, rainfall intensity, rainfall duration and the like are monitored in real time by utilizing a rainfall gauge, the flow rate of production and collection flowing into the interior of the regulating reservoir is monitored in real time by utilizing a regulating reservoir flow meter, the liquid level in the regulating reservoir is monitored in real time by utilizing a regulating reservoir water level meter, and the data information is transmitted to a controller;
(3) In the last rainfall period, the controller calculates the confluence V based on the last rainfall data 1 Duration of confluence T m And at T m The operation of the drainage pump and the flowmeter is stopped when the confluence is finished, so that the runoff sewage just fills the effective volume V of the regulating reservoir 0 ；
(4) When the microbial activity in the microbial reactor is monitored to be low at a certain time after the last rainfall period is finished, the controller is based on the predicted rainfall period T 1 Determination T m <T≤T 1 The intermittent operation of the drainage pump and the flowmeter is controlled, and V is conveyed into the microbial reactor every day 0 The runoff sewage of/14 can be intermittently fed for 3-5 times daily, so that uniform water feeding is realized as much as possible, and continuous uniform water feeding can be realized daily;
(5) Closing all sludge pumps of the microbial reactor to ensure that the runoff sewage in the regulating reservoir can reach the aerobic reaction zone, thereby providing growth conditions for microorganisms in the aerobic reaction zone to the maximum extent and maintaining biological activity;
(6) In the aerobic reaction zone, aerobic microorganismsThe microbial wastewater treatment agent is attached to a fixed carrier material, has stronger impact resistance compared with microorganisms in suspended activated sludge, and has smaller discharge amount of the runoff wastewater, and the microorganisms and nutrient substances (COD and NH) in the runoff wastewater 3 N, TP) the main contaminants are removed and most of the microorganisms remain active while the small part of them are gradually attenuated by the lack of nutrients and endogenous digestion;
(7) The concentrated activated sludge in the sludge activation zone is intermittently discharged into the aerobic reaction zone of the microbial reactor by the controller under the control of the second sludge discharge pump due to insufficient nutrients caused by long-time less water inlet of the microbial reactor, and the concentrated activated sludge discharged is concentrated pollutant adsorption sludge with high nutrient concentration, so that the nutrients in the concentrated activated sludge and microorganisms in the aerobic reaction zone are subjected to biochemical reaction, the activity of the microorganisms is improved, and the long-time (T) of the microbial reactor is realized 1 =14d) retains microbial activity.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (9)
1. The composite microbial system for in-situ treatment of runoff sewage is characterized by comprising a regulating reservoir, a microbial reactor and a controller, wherein a water outlet of the regulating reservoir is communicated with a water inlet of the microbial reactor through a pipeline, a drainage pump and a flowmeter are arranged on the pipeline, and the controller is correspondingly connected with the drainage pump and the flowmeter respectively;
the controller is used for determining the drainage flow of the regulating reservoir by utilizing a preset yield and confluence model based on the latest rainfall data, the predicted rainfall data and the water storage data of the regulating reservoir, controlling the drainage pump and the flowmeter according to the drainage flow, and conveying the runoff sewage in the regulating reservoir to the microbial reactor so as to enable the drainage period of the regulating reservoir to be suitable for the predicted rainfall period;
The microbial reactor is used for carrying out microbial treatment on the runoff sewage flowing into the microbial reactor and generating activated sludge;
the microbial reactor comprises a sedimentation zone, a facultative adsorption zone and an aerobic reaction zone which are sequentially communicated, wherein the bottom of the facultative adsorption zone is provided with a first sludge bucket, and a sludge outlet of the microbial reactor is positioned on the wall of the first sludge bucket; the facultative adsorption zone is used for performing facultative adsorption treatment on the runoff sewage, activated sludge containing microorganisms is suspended in the facultative adsorption zone, and a perforated pipe for aeration and/or stirring is arranged at the bottom of the facultative adsorption zone;
the composite microbial system further comprises:
a sludge activation tank for storing the activated sludge generated in the microbial reactor, comprising a sludge concentration zone and a sludge activation zone which are communicated with each other, wherein an inlet of the sludge activation tank is positioned on the wall of the sludge concentration zone, and an outlet of the sludge activation tank is positioned on the wall of the sludge activation zone; a water skimming device is arranged in the sludge concentration area and used for dehydrating and concentrating the activated sludge in the sludge concentration area; a stirring device is arranged in the sludge activation zone and is used for activating the concentrated sludge in the sludge activation zone;
The inlet of the sludge activation tank is communicated with the sludge outlet of the microbial reactor through a first sludge pump, and the outlet of the sludge activation tank is communicated with the sludge inlet of the microbial reactor through a second sludge pump; the second sludge pump is correspondingly connected with the controller, and the controller is also used for controlling the second sludge pump to convey the activated sludge stored in the sludge activation tank to the microbial reactor when the water inflow of the microbial reactor in a preset time period is less than a preset value.
2. The composite microbial system of claim 1, wherein the bottom of the aerobic reaction zone is a second sludge hopper, and the second sludge hopper is communicated with the facultative adsorption zone through a third sludge pump;
the water inlet of the microbial reactor is positioned on the wall of the sedimentation zone, and the sludge inlet of the microbial reactor is positioned on the wall of the second sludge hopper;
the sedimentation zone is used for sedimentation to remove granular pollutants in the runoff sewage, an inclined plate for sedimentation attachment of the granular pollutants is arranged in the sedimentation zone, and a fourth sludge pump for discharging the granular pollutants is arranged at the bottom of the sedimentation zone;
the suspension solid concentration of the mixed solution in the facultative adsorption zone is 2000-4000 mg/L;
The aerobic reaction zone is used for carrying out aerobic reaction treatment on the runoff sewage, carrier materials attached with microorganisms are filled in the aerobic reaction zone, and an aeration device is arranged at the bottom of the aerobic reaction zone; the filling volume of the carrier material accounts for 60-80% of the internal volume of the aerobic reaction zone.
3. The composite microbial system of claim 1 or 2, wherein the last rainfall data comprises last rainfall, last rainfall intensity, and last rainfall duration; the predicted rainfall data comprises a predicted rainfall amount, a predicted rainfall intensity, a predicted rainfall duration, a predicted rainfall period and a predicted rainfall probability; the regulation pool water storage data comprise regulation pool liquid level and/or regulation pool converging flow.
4. The composite microbial system of claim 3, wherein the composite microbial system further comprises:
the hydrological weather station is correspondingly connected with the controller and is used for acquiring the latest rainfall data, the predicted rainfall data and the storage water data of the regulating reservoir and sending the latest rainfall data, the predicted rainfall data and the storage water data of the regulating reservoir to the controller;
the hydrological station comprises:
the rain gauge is used for acquiring the latest rainfall data;
the communicator is used for acquiring the rainfall prediction data;
The regulation and storage Chi Huiliu flowmeter is used for acquiring the confluence flow of the regulation and storage tanks;
and the regulation and storage tank water level gauge is used for acquiring the liquid level of the regulation and storage tank.
5. A method for in situ treatment of runoff sewage of a composite microbial system according to claim 1, comprising the steps of:
determining the drainage flow of the regulating reservoir by utilizing a preset yield converging model based on the latest rainfall data, the predicted rainfall data and the water storage data of the regulating reservoir;
delivering the runoff sewage in the regulating reservoir to a microbial reactor based on the drainage flow rate so as to perform microbial treatment;
wherein, based on the drainage flow, the drainage period of the regulating reservoir is adapted to the predicted rainfall period;
the microbial processor comprises a sedimentation zone, a facultative adsorption zone and an aerobic reaction zone, and the method further comprises:
sending activated sludge generated by facultative adsorption treatment in the facultative adsorption zone into a sludge activation tank for storage; and
and re-feeding at least part of the activated sludge stored in the sludge activation tank into the microbial reactor when the water inflow of the microbial reactor is less than a preset value in a preset time period.
6. The method of claim 5, wherein said delivering the runoff wastewater in the conditioning tank to a microbial reactor for microbial treatment comprises:
conveying the runoff sewage in the regulating reservoir to the sedimentation zone, and settling the granular pollutants in the runoff sewage under the action of a flocculating agent;
enabling the first supernatant fluid after the sedimentation in the sedimentation zone to enter the facultative adsorption zone, and performing facultative adsorption treatment under the action of microorganisms in suspended activated sludge in the facultative adsorption zone;
enabling the second supernatant liquid after the facultative adsorption treatment in the facultative adsorption zone to enter the aerobic reaction zone, and carrying out aerobic reaction treatment under the action of microorganisms in the aerobic reaction zone.
7. The method of claim 6, wherein the method further comprises: discharging the third supernatant after the aerobic reaction treatment into a storage water body;
and/or, sending the activated sludge generated by the aerobic reaction treatment into the facultative adsorption zone for the facultative adsorption treatment.
8. The method according to any one of claims 5 to 7, wherein determining the drainage flow rate of the storage tank using a preset confluence model based on the latest rainfall data, the predicted rainfall data, and the storage tank water storage data, comprises:
Based on the latest rainfall data, a preset yield and confluence model is utilized to determine a predicted confluence amount V to be pooled in the regulation pool 1 Predicting a confluence duration T m ；
Based on the predicted sink volume V 1 Predicting confluence duration T m Predicted rainfall period T 1 Effective capacity V of regulating reservoir 0 Determining the drainage flow Q of the regulating reservoir within a preset time length T 1 ；
The preset duration T is the duration from the current time point to the predicted rainfall time point.
9. The method according to claim 8, wherein the predicting the aggregate flow V based on 1 Predicting confluence duration T m Predicted rainfall period T 1 Effective capacity V of regulating reservoir 0 Determining the drainage flow Q of the regulating reservoir within a preset time length T 1 Comprising:
at T is less than or equal to T m In the case of Q 1 =(V 1 -V 0 )/T m ；
At T m <T ≤ T 1 In the case of Q 1 =V 0 /T。
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