CN111675381B

CN111675381B - Method for treating rain sewage mixed flowing water

Info

Publication number: CN111675381B
Application number: CN202010564235.9A
Authority: CN
Inventors: 刘睿; 何俊超; 王�琦; 王媛媛; 杨耸
Original assignee: China Urban Construction Design and Research Institute Co Ltd
Current assignee: China Urban Construction Design and Research Institute Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-11-09
Anticipated expiration: 2040-06-19
Also published as: CN111675381A

Abstract

The invention relates to the field of water pollution prevention and control, and provides a method for treating rain and sewage mixed water, which comprises the following steps: continuously monitoring the water flow and the rainfall depth of a water inlet of an intercepting well, and monitoring whether the water level of the mixed rain and sewage flow entering a regulation and storage tank from the intercepting well reaches a pump stopping water level, a medicine preparation water level and a pump starting water level; when a flow condition is met or the water level of the prepared medicine is reached, a medicine barrel in the dispensing room starts to prepare the medicine; when the water level of the rain and sewage mixed water in the regulating and storing tank reaches the pump starting water level, starting a water pump, conveying the rain and sewage mixed water to a reaction tank of a purification system by the water pump, continuously adding a medicament prepared in a dispensing room into the reaction tank, carrying out flocculation reaction in the reaction tank, and when the water level of the rain and sewage mixed water in the regulating and storing tank is equal to or lower than the pump stopping water level, stopping conveying the rain and sewage mixed water by the water pump, and stopping adding the medicament prepared in the dispensing room; and separating the concrete and the liquid after reaction. The method of the invention can automatically and rapidly treat the rain sewage mixed flowing water.

Description

Method for treating rain sewage mixed flowing water

Technical Field

The invention relates to the field of water pollution prevention and control, in particular to a method for treating rain and sewage mixed water.

Background

In recent years, in the urban development and construction process of China, although a newly-built drainage system adopts a split system, due to the reasons of lack of scientific method guidance, insufficient construction supervision and the like, phenomena of mixed connection, misconnection and the like of pipe networks in different degrees generally exist in practice, and due to the complex conditions of mixed connection and misconnection of the pipe networks, the complete distribution of rain and sewage is difficult to achieve in a short time. The mixed connection and the misconnection of the pipe network easily cause the direct drainage of the sewage in dry weather at the discharge port, and the rainwater mixed with a large amount of sewage overflows into the river channel when raining, so that the rainwater becomes an important pollution source of the urban water body and the water environment quality faces serious threats.

At present, when the pollution problem is treated, the traditional method for treating combined flow overflow is to increase the intercepting amount of an intercepting well and construct a distributed regulation and storage tank. The sewage intercepted by the intercepting well flows into the sewage treatment plant through the downstream sewer pipe, and if the intercepting amount of the intercepting well is increased, the load of the downstream sewer pipe and the sewage treatment plant is increased. The regulation pond reduces overflow frequency and overflow volume through temporarily storing the dirty mixed flow of rain with the overflow, but the regulation pond needs to occupy a large amount of lands, and the regulation pond volume of urban construction is often crossed ten thousand cubic meters to the regulation pond needs certain time to empty, if meet the condition of continuous rainfall, the regulation pond can not in time discharge the dirty mixed flow of rain, then will lose effect.

Chinese patent application 201621271119.3 discloses a rain and sewage mixed flow wastewater treatment system, which discharges rain and sewage mixed flow wastewater into an ecological oxidation pond after anaerobic reaction, and the ecological oxidation pond discharges the rain and sewage mixed flow wastewater into a river channel after being degraded by microorganisms. When rainfall is excessive, the mixed rain and sewage flow of the system can be discharged into a municipal sewage pipe well, and the treatment capacity of a sewage treatment plant can be increased. Moreover, the system adopts a biological treatment process for treatment, and has the defects of long hydraulic retention time and limited treatment capacity when the water quantity is large in rainy days.

Chinese patent application 201810359824.6 discloses a multifunctional rainwater storage tank intelligent control method, which discharges water in the storage tank in advance according to the forecasted rainfall, reserves enough volume in advance for accommodating the peak value of the rainstorm, closes a water inlet valve of the storage tank and starts to precipitate when the liquid level in the storage tank reaches a high limit, detects the water quality of the uppermost layer liquid level in the storage tank after precipitating for a certain time (generally about 8 hours), and selects to discharge the water into a sewage pipeline or supply the water to a user according to the detection result. The treatment time by the method is long, and the rainwater cannot be quickly treated if continuous rainstorm occurs.

Chinese patent application 201910800825.4 discloses a rain sewage confluence pipeline sewage collection processing apparatus, and when this processing apparatus purified sewage, earlier blocked rubbish in the sewage, discharged sewage into the sewage treatment pond again, sewage treatment pond handled sewage through coagulating sedimentation, got rid of mud from the bottom of the pool, and the pond bed deep purification district is discharged into to the supernatant, through the absorption of plant, the filtration of filler and the degradation of microorganism, further purified water quality, the river course of discharging into at last. The adoption of the processing device has the following disadvantages: (1) the treatment device adopts a sewage treatment mode, and basically has no function of quickly treating rainwater when the rainfall is large; (2) the preparation of the reagent for coagulation needs long activation time and short shelf life, rainfall has uncertainty, the reagent needs to be prepared in advance according to the rainfall condition of weather forecast, and the whole process needs manual work to adjust the preparation of the reagent according to the rainfall condition, if a quantitative reagent is prepared in advance but the rainfall is insufficient, waste is easy to cause, and when the rainfall is too large, the requirement of water quality treatment cannot be met.

Therefore, it is highly desirable to invent a method for treating rainwater and sewage mixed flow, which can rapidly treat rainwater and sewage mixed flow and can save coagulating agent, while occupying as much as possible of the volume of urban construction.

Disclosure of Invention

Aiming at a plurality of problems in the prior art, the invention provides a method for treating rain and sewage mixed water, which comprises the following steps:

a: continuously monitoring the water flow and the rainfall depth of a water inlet of an intercepting well, and monitoring whether the water level of the mixed rain and sewage flow entering the regulating and storing tank from the intercepting well reaches a pump stopping water level, a medicine preparation water level and a pump starting water level;

b: when a flow condition is met or the water level of the prepared medicine is reached, a medicine preparation barrel in the medicine preparation room starts to prepare the medicine, and the medicine is activated during the medicine preparation, wherein the flow condition is that the water flow at the water inlet of the intercepting well reaches a preset flow and the rainfall depth reaches the runoff depth of the catchment area;

c: when the water level of the rain and sewage mixed water in the regulating and storing tank reaches the pump starting water level, starting a water pump, conveying the rain and sewage mixed water to a reaction tank of a purification system by the water pump, continuously adding a medicament prepared in a dispensing room into the reaction tank, carrying out flocculation reaction in the reaction tank, and when the water level of the rain and sewage mixed water in the regulating and storing tank is equal to or lower than the pump stopping water level, stopping conveying the rain and sewage mixed water by the water pump, and stopping adding the medicament prepared in the dispensing room, wherein the pump starting water level is higher than the medicament preparing water level, and the medicament preparing water level is higher than the pump stopping water level;

d: separating the concrete and the liquid after reaction, discharging the liquid and recovering the concrete.

The mixed rain and sewage flow is the mixture of rain water and sewage. In rainy days, the proportion of rainwater in the rainwater-sewage mixed flow water is large; when the rain and sewage mixed flow does not rain, the sewage in the rain and sewage mixed flow occupies a larger amount or only has sewage. The sewage comprises domestic sewage and water outside the pipeline. The external water of the pipeline refers to external water entering the drainage pipeline from the position not tight in the pipeline, and comprises municipal general water, water poured back from rivers and infiltrated underground water.

According to an example embodiment of the present invention, in step B, the preset flow rate is a maximum intercepting amount of the intercepting well.

According to an exemplary embodiment of the present invention, the maximum intercepting amount is greater than or equal to the maximum flow rate of the intercepting port of the intercepting well for downstream sewage and is not more than 2 times the maximum flow rate of the intercepting port of the intercepting well for downstream sewage.

According to an exemplary embodiment of the present invention, in step B, starting the preparation of a dispensing barrel of the dispensing room comprises: one of the dispensing barrels of the dispensing room starts to prepare the medicine, and when the medicine preparation of one dispensing barrel is completed and the flow condition or the water level condition is also met, the medicine preparation of the other dispensing barrel is started.

According to an exemplary embodiment of the invention, in step B, the time for which one dispensing cartridge supplies medicament to the reaction chamber matches the time for which the medicament prepared by the other dispensing cartridge is sufficiently active.

According to an exemplary embodiment of the present invention, in step B, the amount of the mixed rain and sewage is prepared by one dispensing barrel and is matched with the treatment amount of the mixed rain and sewage in the reaction tank for twenty minutes to one hour.

According to an example embodiment of the present invention, step B further comprises: when satisfying the flow condition, before dirty mixed flow water of rain gets into the regulation pond, intercept the solid in the dirty mixed flow water of rain and retrieve the solid to bars sediment bucket, the solid in the dirty mixed flow water of rain includes rubbish, large granule suspended solid and large granule floater.

According to an exemplary embodiment of the invention, the blockage rate caused by continuous interception of rain and sewage mixed flowing water is sent out, and when the blockage rate exceeds a preset value, an alarm signal is sent out to prompt manual dredging or check whether a device for intercepting solids is damaged or not.

According to an exemplary embodiment of the invention, said preset value is between 40% and 60%.

According to an example embodiment of the present invention, step B further comprises: the amount of the solid in the grid slag barrel is continuously monitored, and when the grid slag barrel is full, an alarm signal is sent out to prompt that the solid in the grid slag barrel is manually transported out.

According to an exemplary embodiment of the present invention, in step C, the continuously adding the prepared drug between the doses to the reaction cell includes: adding the prepared medicament in one dispensing barrel into the reaction tank, and adding the prepared medicament in the other dispensing barrel after the medicament in one dispensing barrel is added.

According to an exemplary embodiment of the invention, in step C, the level of the priming pump water level above the priming water level is determined by simulation of a model that allows sufficient activation of the medicament prepared by the dispensing tank during the rise of the water level in the reservoir from the priming water level to the priming pump water level.

According to an exemplary embodiment of the present invention, in step C, the regulating reservoir further includes an overflow water level not lower than the pump-starting water level, and when the water level of the regulating reservoir is higher than the overflow water level, the high rain and sewage mixed water is discharged out of the regulating reservoir from the overflow port.

According to an exemplary embodiment of the present invention, in step D, the separating the reacted concrete and liquid includes: adopting a supermagnetic separation or coagulating sedimentation process. When the concrete and the liquid are separated, the separation efficiency of the concrete and the liquid can be improved by adopting the ultra-magnetic separation with short hydraulic retention time or the high-efficiency coagulating sedimentation process.

According to an exemplary embodiment of the invention, in step D, the recycled concrete comprises: discharging the concrete into a sludge basin, continuously monitoring whether the water level of the concrete in the sludge basin reaches a sludge clearing water level, and sending an alarm signal to prompt manual clearing of the concrete when the water level exceeds the sludge clearing water level. The mud basin is adopted to bear the separated concrete, liquid can be contained in the concrete, the bearing capacity of the mud basin is limited, and if the concrete in the mud basin is too much, the water level of the mixture can be improved and the concrete can easily exceed the bearing range of the mud basin. And setting a sludge removal water level in the sludge settling tank, and prompting manual removal of the concrete when the water level of the sludge settling tank exceeds the sludge removal water level and the concrete is more in the mixture.

The invention has the beneficial effects that:

the invention determines the time and the dosage of the medicament by continuously monitoring the rainfall, can automatically and quickly treat the mixed rainwater and sewage flow, and can prepare a proper amount of medicament according to the mixed rainwater and sewage flow, and is explained by the following points:

(1) when the rainfall is very big, through the continuous monitoring rainfall, discharge in the vatch basin, obtain the information of the water yield of the dirty mixed flow water of rain that has not got into in the regulation pond, when satisfying the flow condition, there is sufficient reserve time to prepare the medicament in advance between dispensing, make the medicament activation, when water level in the regulation pond reaches the pump starting water level, the medicament activation of preparation is to the best degree of effect of coagulating between dispensing, not only can accomplish the activation of medicament when the pump starting, and can also reach best activation effect, handle the dirty mixed flow water of rain fast.

(2) Under the condition that the discharge at the vatch basin water inlet did not reach preset flow or the rainfall degree of depth did not reach catchment district runoff producing degree of depth, it overflows to the regulation pond to have dirty mixed flow water of rain to last from the vatch basin, as standby measure through setting up the preparation water level, continuously monitor the water level in the regulation pond, when satisfying the water level condition, it prepares the medicament in advance to have sufficient reserve time between dispensing, make the medicament activation, when the water level in the regulation pond reaches the pump starting water level, the medicament activation of preparation to the best degree of coagulation effect between dispensing, not only can accomplish the activation of medicament when the pump starting, and can also reach the best activation effect, the dirty muddy flowing water of rapid processing rain.

(3) Two dispensing barrels for dispensing in turn are arranged between the dispensing chambers, in the process that one dispensing barrel dispenses and continuously adds the medicament into the reaction tank, if the flow condition is still met or the water level of the prepared medicament in the storage tank is still reached, the rain and sewage mixed flow water which needs to be treated still exists, and at the moment, the other dispensing barrel starts to prepare the medicament; when one dispensing barrel finishes adding the medicament into the reaction tank, the other dispensing barrel just finishes preparing the medicament, and the other dispensing barrel starts adding the medicament. The two medicine barrels are matched with each other to feed medicine in turn, so that the medicine is uninterruptedly supplied to the reaction tank, and the efficient and rapid treatment of rain sewage mixed water is ensured.

(4) According to the method, automatic control of medicine preparation and medicine adding is realized by setting the threshold conditions, so that the links of manual monitoring can be reduced, the frequency of manual maintenance is reduced, unattended full-process automatic control is realized to cope with various rainfall situations which are difficult to predict, and the dosage of the medicine is saved. For example: in the prior art, a medicament for one or half a day is prepared in advance through early warning of weather forecast, but rainfall is uncertain, and if the weather forecast is inaccurate and the rainfall is not realized, the medicament prepared in advance can be completely ineffective due to long-time shelf; if the method is adopted to dispense medicines according to the real-time condition, the medicine of one dispensing barrel is wasted at most, and the medicine of one dispensing barrel is about half an hour of the treatment capacity of the reaction tank, so that compared with the medicine of one day or half a day, the method can avoid the waste of a large amount of medicines.

(5) Because the dispensing room can uninterruptedly provide the medicament with the best effect, when the rainfall is large, the rain-sewage mixed flowing water can be quickly treated, and then the treated water is discharged into the tail end inspection well.

(6) When garbage blockage, excessive garbage or excessive sludge occur in the whole treatment process, manual treatment is reminded, and rainwater and sewage mixed flow water can be treated more efficiently.

Drawings

FIG. 1 is a schematic view of a system for treating mixed rainwater and sewage.

The system comprises 1-an inspection well at the upstream of the intercepting well, 2-a flowmeter, 3-a rain measuring cylinder, 4-the intercepting well, 5-an overflow weir, 6-an intercepting port, 7-a duty room, 8-a control device, 9-a grid room, 10-a grid machine, 11-a grid slag barrel, 12-a regulating and storing tank, 13-a dispensing room, 14-a dispensing barrel, 15-a reaction tank, 16-a water pump, 17-an overflowing port, 18-a mud sedimentation tank, 19-a sludge pump, 20-a tail end inspection well and 21-a purified water discharge port.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the invention and are not necessarily drawn to scale.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

According to an aspect of the present invention, there is provided a mixed rainwater and sewage flow treatment system, as shown in fig. 1, comprising: the device comprises a rain measuring cylinder 3, a flowmeter 2, a blockage rate monitoring device, a grid room 9, a regulation and storage tank 12, a purification system, a control device 8 and an alarm device.

The rain gauge 3 is arranged on the ground to receive rain water for monitoring the rainfall. A first water level meter for measuring rainfall is arranged in the rain gauge 3 and adopts a vertical rod type ball float valve and/or an electronic liquid level meter.

The flowmeter 2 is arranged in a pipeline between the inspection well 1 at the upstream of the intercepting well 4 and a water inlet of the intercepting well 4 and is used for measuring the flow of rain and sewage mixed flowing water entering the intercepting well 4, and the rain and sewage mixed flowing water is a mixture of rainwater and sewage. In rainy days, the proportion of rainwater in the rainwater-sewage mixed flow water is large; when the rain and sewage mixed flow does not rain, the sewage in the rain and sewage mixed flow occupies a larger amount or only has sewage. The sewage comprises domestic sewage and water outside the pipeline. The external water of the pipeline refers to external water entering the drainage pipeline from the position not tight in the pipeline, and comprises municipal general water, water poured back from rivers and infiltrated underground water. The flowmeter 2 is used for monitoring the water flow rate at the water inlet of the intercepting well 4, and can be arranged in a pipeline between the inspection well 1 and the intercepting well 4 at the upstream of the intercepting well 4 as shown in figure 1, and also can be arranged at the water inlet of the intercepting well 4.

The blockage rate monitoring device is arranged in the space between the grids 9 and is used for monitoring the blockage condition of rain and sewage mixed water in the space between the grids 9. The blockage rate monitoring device can obtain a value related to the blockage situation by monitoring the flow change of the upstream and the downstream of the grating machine 10 or the water level difference of the upstream and the downstream of the grating machine 10 and then calculating.

The water inlet of the grid room 9 is connected with the water outlet of the intercepting well 4, the water outlet of the grid room 9 is connected with the water inlet of the regulating and storing pool 12, a grid machine 10 for intercepting and conveying solid in the rain and sewage mixed flow water is arranged in the grid room 9, a grid slag barrel 11 is arranged at one end, separated from the solid, of the grid machine 10, and the grid slag barrel 11 is used for collecting the solid conveyed by the grid machine 10. Wherein the solid comprises garbage, large-particle suspended matters and large-particle floating matters.

The water inlet of the storage tank 12 is connected with the water outlet of the grid room 9 and receives rain and sewage mixed flowing water which overflows from the intercepting well 4 and flows through the grid room 9. The regulation pool 12 is also connected to a purification system to which the rain and sewage mixed flow is delivered. The regulation and storage tank 12 has the following three functions: (1) a distribution tank as a reaction tank 15 of the purification system; (2) storing the coagulation medicament to prepare the rain and sewage mixed flow water during the activation period; (3) regulating and storing the rain and sewage mixed flow water which exceeds the treatment capacity of the reaction tank 15. A second water level meter and an overflow port 17 are arranged in the regulating and storing tank 12, the second water level meter adopts a vertical rod type ball float valve and/or an electronic liquid level meter and is used for monitoring the water level in the regulating and storing tank 12; the overflow port 17 is not lower than the pump-starting water level of the regulation and storage tank 12, the downstream of the overflow port 17 is provided with a tail end inspection well 20, and the tail end inspection well 20 discharges water into a river channel through a discharge port.

The purification system comprises a water pump 16, a dispensing room 13, a reaction tank 15, a sludge settling tank 18 and a sludge pump 19. The water pump 16 conveys the mixed flow of rain and sewage in the storage tank 12 to the reaction tank 15. The dispensing room 13 supplies the medicines to the reaction tank 15, and the dispensing room 13 comprises two dispensing barrels 14, namely a dispensing barrel A and a dispensing barrel B. The A dispensing barrel and the B dispensing barrel respectively comprise a dispensing groove, an activation tank and a medicine outlet, the dispensing groove provides quantitative medicines for the activation tank, the medicines are activated in the activation tank, the activation tank is connected with the medicine outlet, and the medicine outlet supplies medicines for the reaction tank 15. The dispensing barrel A and the dispensing barrel B are both connected with the control device 8 in a communication mode and used for receiving a medicine preparation instruction sent by the control device 8. When the A dispensing barrel adds the medicine to the reaction tank 15, the B dispensing barrel can dispense the medicine, and when the medicine of the A dispensing barrel is completely added with the medicine, the B dispensing barrel then adds the medicine to the reaction tank 15, so that the medicine can be continuously provided between the dispensing chamber 13. A separation device and a purified water discharge port 21 are arranged in the reaction tank 15, the separation device is used for separating concrete and liquid after reaction, a tail end inspection well 20 is arranged at the downstream of the purified water discharge port 21, and the tail end inspection well 20 discharges the liquid, namely the clean water, into a river channel through the discharge port. A sludge basin 18 is located downstream of the reaction basin 15 for recovering the concrete. And a third water level meter is arranged in the mud basin 18 and used for monitoring the water level of liquid mixed in the concrete, and the third water level meter adopts a vertical rod type ball float valve and/or an electronic liquid level meter. A sludge pump 19 is provided in the sedimentation tank 18 and discharges sludge to a downstream sludge collection device.

The control device 8 and the alarm device are arranged in the duty room 7, and the control device 8 is in communication connection with the first water level gauge, the flowmeter, the grating machine 10, the second water level gauge, the water pump 16 of the purification system and the dispensing room 13 and is used for controlling the operation of the dispensing barrel 14 in the grating machine 10, the water pump 16 and the dispensing room 13 according to the measurement results of the first water level gauge, the second water level gauge and the flowmeter. The control device 8 also comprises a display and/or a plurality of signal lights which show the operating state of the entire system, for example: starting the grid machine 10, the dispensing room 13 for preparing the medicines, starting the water pump 16, starting the sludge pump 19 and the like.

The alarm device is in communication connection with the blockage rate monitoring device, the grid slag barrel 11 and the third water level meter, and prompts manual treatment when the mixed rainwater and sewage blockage exceeds a preset value, such as 40-60%, and the grid slag barrel 11 is filled with solid garbage or sludge in the sludge settling tank 18 exceeds a sludge removal water level.

Adopt the processing system of rain and sewage mixed flow water, flowmeter 2 and rain graduated flask 3 continue monitoring flow and rainfall, when the great rain and sewage of rainfall mixes flowing water and still flows into regulation pond 12 or when the water level in the great regulation pond 12 of rainfall reaches the preparation water level, controlling means 8 just gives the room 13 of dispensing and issues the instruction and begin to dispense, and adopt two dispensing barrels 14 to dispense in turn, when making the rain and sewage mixed flow water arrive reaction tank 15 under the transport of water pump 16, the medicament of dispensing barrel 14 preparation reaches the best effect, can handle rain and sewage mixed flow water fast, high-efficiently, reduce the volume of the rain and sewage mixed flow water of regulation pond 12 storage, further reduce the shared space of regulation pond 12, reduce the load of sewage treatment plant simultaneously.

According to a second aspect of the present invention, there is provided a method for treating mixed rainwater and sewage, the method using the system for treating mixed rainwater and sewage of the first aspect of the present invention, as shown in fig. 1, comprising the steps of:

a: continuously monitoring the water flow of a water inlet of the intercepting well 4, the rainfall depth of the rain measuring cylinder 3, whether the water level of the mixed rain and sewage water flowing into the regulating and storing tank 12 from the intercepting well 4 reaches a pump starting water level, a medicine preparation water level and a pump stopping water level, continuously monitoring the blocking condition in the grid room 9, the amount of solids in the grid slag barrel 11 and the water level of the sludge settling tank 18.

The regulation pond 12 is established in the low reaches of vatch basin 4, and when the mixed flow volume of rain and sewage is too big, the damming mouth 6 of vatch basin 4 can not be with all mixed flow of rain and sewage water discharge to sewage treatment plant, and the mixed flow of rain and sewage that exceeds overflow weir 5 this moment overflows, flows into regulation pond 12 from the delivery port of vatch basin 4. The rain and sewage mixed flow water enters the purification system for treatment after being regulated and stored in the regulation and storage tank 12.

The water entering from the water inlet of the intercepting well 4 is rainwater and sewage mixed flow water, namely mixed water of rainwater and sewage; the rain gauge 3 monitors rain; the water in the regulation pond 12 mixes flowing water for surpassing the rain and sewage of vatch basin 4 damming capacity, mixes flowing water through three aspect monitoring rainwater and rain and sewage, can obtain more accurate water yield information, makes preparation for handling the dirty mixed flow water of rain in advance.

Because the rainwater and sewage mixed flow of the intercepting well 4 is provided with solids, the grating machine 10 intercepts and transmits the solids, and if the grating machine 10 fails to transmit the solids to the grating slag barrel 11, the rainwater and sewage mixed flow is blocked and the flow of the rainwater and sewage mixed flow is influenced. The rate of blockage in the compartment 9 is calculated from the water flow upstream and downstream of the griller 10. When the blockage rate in the grating room 9 exceeds 40% -60%, an alarm signal is sent out to prompt manual dredging and check whether the grating machine 10 breaks down or not. Wherein the solid comprises garbage, large-particle suspended matters and large-particle floating matters.

B: when the flow condition is met or the water level in the storage tank 12 reaches the medicine preparation water level, the control device 8 in the duty room 7 sends an instruction, the dispensing barrel A of the dispensing room 13 starts medicine preparation, and when the dispensing barrel A finishes medicine preparation and the flow condition is also met or the water level in the storage tank 12 reaches the medicine preparation water level, the dispensing barrel B starts medicine preparation; if the medicine preparation of the B medicine preparation barrel is finished and the flow condition is met or the water level in the regulating and storing pool 12 reaches the medicine preparation water level, the A medicine preparation barrel starts to prepare medicine, and the like. During the preparation period, the medicament is activated, and usually one dispensing barrel 14 is prepared for a dosage which matches the treatment capacity of the reaction cell from 15 minutes to one hour, preferably half an hour.

The flow conditions are that the water flow at the water inlet of the intercepting well 4 reaches the maximum intercepting flow of the intercepting well 4 and the rainfall depth reaches the runoff producing depth of the catchment area. In one embodiment, the maximum intercepting amount of the intercepting well 4 is greater than or equal to the maximum flow of the sewage discharged downstream from the intercepting port 6 of the intercepting well and is not more than 2 times of the maximum flow of the sewage discharged downstream from the intercepting port 6 of the intercepting well, and the maximum intercepting amount is adjusted by the height of the overflow weir 5. The term "runoff depth" refers to the corresponding depth of rainfall at the time of runoff. The flow rate condition is set to monitor the flow rate and the rainfall of the rain-sewage mixed water that does not flow into the storage tank 12 in advance, and if both conditions are satisfied, it indicates that the rainfall is so large that a sufficient amount of water flows into the storage tank 12, and the bearing capacity of the storage tank 12 may be exceeded in a short time. Therefore, the preparation of the medicines is started when the mixed rain and sewage water does not flow into the storage tank 12, and the medicine preparation room 13 has enough time for the medicines to be activated. If the agent cannot be activated in a short time after the mixed rain and sewage flow enters the regulating and storing tank 12 and the agent is prepared again, the agent needs to wait for activation or react by using the insufficiently activated agent. If the medicament is to be activated, the mixed rain and sewage flow exceeding the bearing capacity of the storage tank 12 overflows from the overflow port 17 to pollute the river. If the agent which is not completely activated is used for reaction, the rainwater and sewage mixed flow water with poor treatment effect still pollutes the river channel after being discharged.

The medicine preparation is started when the water level in the regulating and storing tank 12 reaches the medicine preparation water level, and the defects in flow condition monitoring can be overcome. Under the circumstances that the discharge of the water inlet at vatch basin 4 does not reach the maximum damming volume or the rainfall degree of depth does not reach catchment area runoff producing depth, probably there is continuous rain sewage mixed flowing water to spill over to regulation pond 12 from the overflow weir 5 of vatch basin 4, make the water level in the regulation pond 12 rise constantly, if not in time handle the rain sewage mixed flowing water in the regulation pond 12, not only can't realize the regulation effect, still the rain sewage mixed flowing water that the order surpassed the bearing capacity of regulation pond 12 spills over from overflow mouth 17 and pollutes the river course. Therefore, when the flow rate condition is not satisfied, the dispensing booth 13 starts dispensing when the water level in the reservoir 12 reaches the dispensing level, and a sufficient time is allowed for the activation of the medicine.

When the flow condition is met, it is shown that the rainfall and the flow of the rain and sewage mixed water flowing into the catch basin 4 are also sufficiently large at this time, then a large amount of rain and sewage mixed water mixed with solids flows into the storage tank 12, before the rain and sewage mixed water enters the storage tank 12, the control device 8 in the duty room 7 sends an instruction to intercept the solids in the rain and sewage mixed water by starting the grid machine 10 in the grid room 9, and then the grid machine 10 transmits the solids to the grid slag bucket 11.

Meanwhile, the amount of the solid in the grid slag barrel 11 is continuously monitored, and when the solid in the grid slag barrel 11 is enough, an alarm signal is sent out to prompt that the solid in the grid slag barrel 11 needs to be transferred.

The control device 8 is provided with a display and/or a plurality of signal lamps, the water flow of the water inlet of the intercepting well 4 reaches the maximum intercepting flow of the intercepting well 4, the rainfall depth reaches the runoff depth, the water level in the regulating and storing pool 12 reaches the water level of the prepared medicine, the grid machine 10 is started, the water pump 16 is started, the medicine preparation state of the dispensing room 13 and the sludge pump 19 are directly displayed on the display and/or respectively correspond to one signal lamp, and the state of the whole system of the working personnel in the duty room 7 is prompted, for example: starting the grid machine 10, dispensing, starting the water pump, removing sludge, and the like.

C: when the water level of the rain and sewage mixed flow water in the storage tank 12 reaches the pump starting water level, the control device 8 in the duty room 7 sends an instruction to start the water pump 16, and the water pump 16 continuously conveys the rain and sewage mixed flow water to the reaction tank 15 of the purification system.

The medicament prepared by the dispensing barrel A is added into the reaction tank 15. In the process that the A dispensing barrel adds medicines to the reaction tank 15, if the flow condition is met or the water level in the storage tank 12 reaches the medicine preparation water level, the B dispensing barrel starts to prepare medicines, and the time for supplying the medicines to the reaction tank 15 by the A dispensing barrel is matched with the time for sufficiently activating the medicines prepared by the B dispensing barrel. After the medicament in the dispensing barrel A is added, if the preparation of the medicament in the dispensing barrel B is finished, the prepared medicament in the dispensing barrel B is added. In the process that the B dispensing barrel adds medicines to the reaction tank 15, if the flow condition is met or the water level in the storage tank 12 reaches the medicine preparation water level, the A dispensing barrel starts to prepare medicines, and the time for supplying the medicines to the reaction tank 15 by the B dispensing barrel is matched with the time for activating the medicines prepared by the A dispensing barrel sufficiently. After the medicament in the dispensing barrel B is added, if the preparation of the medicament in the dispensing barrel A is finished, the prepared medicament in the dispensing barrel A is added, and the rest is done. By using the medicine preparing and supplying modes of the dispensing barrels A and B in turn, the dispensing room 13 continuously supplies the medicines to the reaction tank 15. During the addition of the chemical, the flocculation reaction is continued in the reaction tank 15.

When the level of the mixed rain and sewage water in the storage tank 12 is equal to or lower than the pump stop level, the water pump 16 is stopped, the mixed rain and sewage water is no longer delivered to the reaction tank 15, and the prepared medicament is no longer added to the reaction tank 15 by the dispensing barrel 14.

Wherein, the water level of the prepared medicine is higher than the water level of the stopped pump, and the water level of the started pump is higher than the water level of the prepared medicine. One of the functions of the regulating and storing tank 12 is to store the rain and sewage mixed flow water during the preparation of the coagulant, and during the period that the water level of the regulating and storing tank 12 is increased from the water level of the prepared medicine to the water level of the starting pump, the dispensing barrel A or the dispensing barrel B of the dispensing room 13 is dispensing medicine. Therefore, the height of the pump starting water level higher than the medicine preparation water level is determined in advance through a model simulation, the model is determined according to local rainfall conditions, the distance of rainwater flowing into the regulating reservoir 12, the runoff coefficient, the area of a water collecting area and other factors, so that during the period that the water level in the regulating reservoir 12 rises from the medicine preparation water level to the pump starting water level, the medicine prepared by the medicine preparation barrel A or the medicine preparation barrel B is sufficiently activated, the activation time is different according to the difference between the medicine and the activating agent, and the activation time of half an hour can be generally selected.

If the rainfall is excessive, the amount of the rain and sewage mixed flow water flowing into the regulation and storage tank 12 per hour exceeds the amount of water conveyed to the reaction tank 15 per hour by the water pump 16, the water level in the regulation and storage tank 12 continuously rises, when the rain and sewage mixed flow water exceeds the overflow water level of the regulation and storage tank 12, the rain and sewage mixed flow water higher than the overflow water level is discharged to the tail end inspection well 20 from the overflow port 17, the tail end inspection well 20 discharges the water into a river channel through the discharge port, and the overflow water level is not lower than the pump starting water level.

D: the separation device of the reaction tank 15 adopts a super-magnetic separation or coagulating sedimentation process with short hydraulic retention time to separate the concrete and the liquid after reaction, the separated concrete is discharged into the mud sedimentation tank 18, the separated liquid is clear water which is discharged to the tail end inspection well 20 through the clear water discharge port 21, and the tail end inspection well 20 discharges the water into the river channel through the discharge port. The sludge in the sludge settling tank 18 is sludge with liquid, and the sludge in the sludge settling tank 18 is discharged to a sludge recovery device through a sludge pump 19. The third water level gauge in the mud basin 18 continuously monitors the water level in the mud basin 18, when the water level in the mud basin 18 exceeds the water level for clearing away the mud, it indicates that a large amount of concrete exists in the mud basin 18, and the water level rises continuously, and if the water level rises, the bearing capacity of the mud basin 18 is possibly exceeded, an alarm signal is sent, and the prompt is given to manually clear away the mud.

The processing method is further explained by specific scenarios as follows:

when the production flow depth and the maximum shutoff amount are simultaneously met:

the rainwater in the rain gauge 3 reaches the runoff yield depth and the flowmeter 2 reaches the maximum shutoff flow, which indicates that a large flow of rain and sewage mixed flow is about to flow into the regulating and storing tank 12, the grid machine 10 is started, the dispensing barrel A of the dispensing room 13 starts to prepare the medicine, the medicine preparation time is half an hour, for example, and the prepared medicine amount is the treatment capacity of the reaction tank 15 for half an hour, for example. Because the rainfall is large, the rain and sewage mixed flow water in the regulation and storage tank 12 reaches the pump starting water level after half an hour, the water pump 16 is started, the A dispensing barrel supplies the medicine to the reaction tank 15, and the medicine supply time is half an hour. At the moment, the rainfall is still large or the water amount in the regulating and storing tank 12 is large, the dispensing barrel B starts to prepare the medicine, when the dispensing barrel A finishes preparing the medicine, the dispensing barrel B starts to supply the medicine, so that the medicine is added to the reaction tank 15 in turn, and the dispensing barrel A and the dispensing barrel B stop preparing the medicine until the rainfall is reduced, the water level in the regulating and storing tank 12 is reduced, and the flow condition is not met and the water level in the regulating and storing tank 12 is lower than the water level for preparing the medicine; until the water level in the regulating reservoir 12 is reduced to the pump stopping water level, the water pump 16 stops running, and the dosing barrels A and B stop dosing.

When the production flow depth and the maximum cut-off flow are not simultaneously met:

the rainwater in the rain gauge 3 does not reach the flow production depth, but the sewage amount may be large, the flow meter 2 reaches the maximum flow stopping amount, and part of the mixed rainwater and sewage flows over the overflow weir 5 and flows into the storage tank 12. If the water level in the storage tank 12 continues to rise, the storage capacity of the storage tank 12 is affected. When the water level in the storage tank 12 reaches the water level of the prepared medicine, it is indicated that the mixed rain and sewage flows into the storage tank 12, the dispensing barrel A of the dispensing room 13 starts to prepare the medicine, the medicine preparation time is half an hour, for example, and the prepared medicine amount is the treatment amount of the reaction tank 15 for half an hour, for example. When the water level in the regulating reservoir 12 reaches the pump starting water level, the water pump 16 is started, the dispensing barrel A supplies the medicine to the reaction tank 15, and the medicine supply time is half an hour. At this time, when the water level in the storage tank 12 is monitored to still reach the water level of the prepared medicine, the dispensing barrel B starts dispensing medicine. After the dispensing barrel A supplies the medicament, the dispensing barrel B completes preparation of the medicament and supplies the medicament to the reaction tank 15. At this time, when the water level in the storage tank 12 is monitored to still reach the water level of the prepared medicine, the dispensing barrel A starts dispensing medicine. After the dispensing barrel B supplies the medicament, the dispensing barrel A completes preparation of the medicament and supplies the medicament to the reaction tank 15. When the flow condition is not satisfied and the water level in the regulation and storage tank 12 is lower than the medicine preparation water level, the medicine preparation is not performed in the medicine barrel B. When the water level in the storage tank 12 drops to the pump stop water level, the water pump 16 stops running, and the medicine dispensing barrel A stops dosing.

According to the two scenes, the treatment method can adjust the amount of the prepared medicament according to the rainfall and the amount of sewage, avoid preparing excessive medicament at one time and reduce the waste of the medicament.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for treating rain and sewage mixed flowing water is characterized by comprising the following steps:

a: continuously monitoring the water flow and the rainfall depth of a water inlet of an intercepting well, and monitoring whether the water level of the mixed rain and sewage flow entering a regulation and storage tank from the intercepting well reaches a pump stopping water level, a medicine preparation water level and a pump starting water level;

b: when a flow condition is met or the water level of the prepared medicine is reached, a medicine preparation barrel in the medicine preparation room starts to prepare the medicine, and the medicine is activated during the medicine preparation, wherein the flow condition is that the water flow at the water inlet of the intercepting well reaches a preset flow and the rainfall depth reaches the runoff depth of the catchment area; the starting of preparing the medicines in one medicine barrel of the dispensing room comprises the following steps: when the medicine preparation of one dispensing barrel is finished and the flow condition or the water level condition is met, the medicine preparation of the other dispensing barrel is started; the dosage prepared by one dispensing barrel is matched with the treatment capacity of the rain and sewage mixed flow water in the reaction tank for twenty minutes to one hour;

2. The method according to claim 1, wherein in step B, the time for supplying the agent from one dispensing barrel to the reaction tank is matched with the time for preparing the agent from another dispensing barrel to be activated sufficiently.

3. The method according to claim 1, wherein the step B further comprises: when satisfying the flow condition, before dirty mixed flow water of rain gets into the regulation pond, intercept the solid in the dirty mixed flow water of rain and retrieve the solid to bars sediment bucket, the solid in the dirty mixed flow water of rain includes rubbish, large granule suspended solid and large granule floater.

4. The method according to claim 3, wherein the step A further comprises: the blocking rate that causes when continuously intercepting the dirty muddy flowing water of rain, when the blocking rate reaches a default, send alarm signal, whether the suggestion carries out artifical mediation or the device of inspection interception solid damages.

5. The method according to claim 3, wherein the step B further comprises: the amount of the solid in the grid slag barrel is continuously monitored, and when the grid slag barrel is full, an alarm signal is sent out to prompt that the solid in the grid slag barrel is manually transported out.

6. The method for treating rainwater and sewage mixed water according to claim 1, wherein in the step C, the continuously adding the prepared chemical in the dispensing room into the reaction tank comprises the following steps: adding the prepared medicament in one dispensing barrel into the reaction tank, and adding the prepared medicament in the other dispensing barrel after the medicament in one dispensing barrel is added.

7. The method according to claim 1, wherein in step C, the level of the priming water level above the priming water level is determined by simulation using a model that allows sufficient activation of the agent prepared by the dispensing tank during the period when the water level in the reservoir rises from the priming water level to the priming water level.

8. The method according to claim 1, wherein in step C, the storage tank further comprises an overflow level not lower than the pump-starting level, and when the water level of the storage tank is higher than the overflow level, the high rain-sewage mixed water is discharged out of the storage tank through the overflow port.

9. The method according to claim 1, wherein the step D of separating the reacted concrete and liquid comprises: adopting a supermagnetic separation or coagulating sedimentation process.

10. The method according to claim 1, wherein in step D, the recycled concrete comprises: discharging the concrete into a sludge basin, continuously monitoring whether the water level of the concrete in the sludge basin reaches a sludge clearing water level, and sending an alarm signal to prompt manual clearing of the concrete when the water level exceeds the sludge clearing water level.