CN112079487B - Intermittent tunnel wastewater treatment system and treatment process - Google Patents

Abstract

The invention discloses an intermittent tunnel wastewater treatment system, wherein the upper part of a coagulation air flotation tank is provided with a water inlet and is connected with a water collecting tank through a water inlet pipe, a stirring and membrane filtration integrated component, a dosing tank, an air distribution pipe and a dissolved air releaser are installed in the coagulation air flotation tank, the stirring and membrane filtration integrated component comprises a paddle, an ultrafiltration membrane, a rotary motor, a vacuum pumping pump and a water outlet pipe, the rotary motor is used for driving the paddle to rotate, the vacuum pumping pump is used for vacuumizing the inner cavity of the ultrafiltration membrane, one end of the water outlet pipe extends into the inner cavity of the ultrafiltration membrane, and the other end of the water outlet pipe vertically penetrates through the ultrafiltration membrane and extends out of the coagulation air flotation tank; the gas distribution pipe is annular and is positioned below the stirring and membrane filtering integrated component, and the dissolved gas releasers are circumferentially and uniformly distributed on the gas distribution pipe. Meanwhile, the invention also discloses an intermittent tunnel wastewater treatment process, which aims to solve the problems that the existing tunnel wastewater treatment system occupies a large area, has low automation degree and can not reach the standard of effluent quality.

Description

Intermittent tunnel wastewater treatment system and treatment process

Technical Field

The invention belongs to the technical field of tunnel wastewater treatment, and particularly relates to an intermittent tunnel wastewater treatment system and a treatment process.

Background

With the continuous development of traffic facility construction in China, a highway is one of the most common facilities, and tunnel engineering is also adopted more and more widely in mountains or hills. In the process of tunnel construction, certain influence is inevitably generated on local water environment, the problem of environmental pollution caused by the influence is increasingly attracted by people, and tunnel construction wastewater is considered as one of main pollution sources. Therefore, in recent years, the investment of treating the tunnel construction wastewater is gradually increased in China, and the water ecological environment around the tunnel is effectively protected.

At present, the main sources of tunnel construction wastewater are: the water gushes generated when the tunnel passes through the unfavorable geological units, the tunnel construction usually encounters the unfavorable geological units such as faults, underground rivers and the like, and the underground water and surface water sources in the pores gush out under the action of pressure to form water gushes; waste water generated by tunnel construction machinery and used large machinery are easy to enter gushing water to cause pollution during discharge due to reasons of grease leakage and the like; the aim of dust reduction is achieved by spraying water on a working surface in the blasting process of settled wastewater after blasting, and the SS of the wastewater is high; according to the source of the wastewater, the main pollutants in the tunnel construction wastewater are suspended matters and petroleum.

At present, the tail end treatment technology taking coagulation, precipitation and filtration as the core is mostly adopted. The prior art has unreasonable technical design: (1) the retention time is short, the volume is small, and the effluent is unstable or unqualified due to overlarge load; (2) the existing process equipment has low automation degree, and a plurality of processes need manual operation, so that the effluent is unstable, and the potential safety hazard is large; (3) the construction site is usually limited, large-scale complete equipment cannot enter the site, and the installation difficulty is high. With the coming of sewage discharge standard policy, the prior art is difficult to meet the discharge requirement after the standard is raised. The main reasons are: a. the fluctuation of the water quantity of the wastewater inlet water is large; b. the device is limited by the site, the volume of the device is small, the load is too high, and the treatment is incomplete; c. some tunnels pass through a water source and cannot treat micropollutants in tunnel wastewater.

Disclosure of Invention

Aiming at the problems, the invention aims to provide an intermittent tunnel wastewater treatment system to solve the problems that the existing tunnel wastewater treatment system occupies a large area, has low automation degree and can not reach the standard of effluent quality.

Therefore, the technical scheme adopted by the invention is as follows: an intermittent tunnel wastewater treatment system comprises a coagulation air flotation tank, a water collecting tank, a slag collecting tank and a control cabinet, wherein a water inlet is formed in the upper portion of the coagulation air flotation tank and is connected with the water collecting tank through a water inlet pipe, a stirring and membrane filtering integrated assembly, a dosing tank, an air distribution pipe and a dissolved air releaser are installed in the coagulation air flotation tank, the stirring and membrane filtering integrated assembly comprises a paddle, an ultrafiltration membrane, a rotating motor, a vacuum pumping pump and a water outlet pipe, the paddle is arranged outside the ultrafiltration membrane in a surrounding mode, the rotating motor is used for driving the paddle to rotate, the vacuum pumping pump is used for vacuumizing the inner cavity of the ultrafiltration membrane, so that water outside the ultrafiltration membrane enters the inner cavity after being filtered by the ultrafiltration membrane, one end of the water outlet pipe extends into the inner cavity of the ultrafiltration membrane, and the other end of the water outlet pipe vertically penetrates through the ultrafiltration membrane and extends out of the coagulation air flotation tank for discharging the water filtered by the ultrafiltration membrane; the gas distribution pipe is annular and is positioned below the stirring and membrane filtering integrated component, and the dissolved gas releasers are uniformly distributed on the gas distribution pipe in a circumferential manner; the bottom of the coagulation air floatation tank is provided with a sludge and sand discharge pipe, the upper part of the coagulation air floatation tank is provided with an overflow port and is connected with the slag collecting tank through an overflow pipe, and the water inlet pipe, the water outlet pipe, the sludge and sand discharge pipe and the overflow pipe are respectively provided with an automatic control valve;

the number of the blades is four, and the blades are uniformly distributed outside the ultrafiltration membrane in a circumferential manner;

the top in the air supporting pond of coagulating is provided with the apron and is used for installing rotating electrical machines and evacuation pump, and the outlet pipe is worn out the bottom in the air supporting pond of coagulating downwards.

More preferably, the coagulation air flotation tank and the slag collecting tank are built together.

Preferably, the dissolved air releasers are six in total, vertical pipes corresponding to the dissolved air releasers one to one are arranged below the air distribution pipe, the vertical pipes are communicated with the air distribution pipe, and one dissolved air releaser is arranged at the tail end of each vertical pipe.

Meanwhile, the invention also discloses an intermittent tunnel wastewater treatment process, which comprises the intermittent tunnel wastewater treatment system and comprises the following steps:

s1, controlling an automatic control valve on a water inlet pipe of the coagulation air flotation tank to be opened by a control cabinet, and controlling the water inlet time of the system; after water inflow is finished, the dissolved air releaser starts to work, supersaturated air is released to form micro bubbles, the micro bubbles are quickly attached to suspended matters, the suspended matters are lifted to the surface of the coagulation air floatation tank to form a sludge floating layer, the control cabinet controls an automatic control valve on an overflow pipe to be opened, the sludge floating layer is discharged into a slag collecting tank, and the first-stage reaction is finished;

s2, the control cabinet controls the dosing tank to dose coagulant into the coagulation air flotation tank, and meanwhile, the rotating motor starts to work, and the blades start to rotate, so that the coagulant is fully mixed with the water body; after the coagulation reaction is finished, the control cabinet opens an automatic control valve on a sludge and sand discharge pipe at the bottom of the coagulation air floatation tank to discharge sludge and grit out of the system, and the second-stage reaction is finished;

s3, controlling the vacuum pump to start running by the control machine room and simultaneously opening the automatic control valve of the water outlet pipe to generate negative pressure in the ultrafiltration membrane, starting filtering the water body in the coagulation air flotation tank, finally discharging the treated tunnel wastewater through the water outlet pipe, finishing the reaction in the third stage and finishing one-time intermittent tunnel wastewater treatment;

and S4, repeating S1-S3, and carrying out the next batch type tunnel wastewater treatment.

The invention has the beneficial effects that:

(1) the stirring and membrane filtering integrated component, the dosing tank and the air flotation device are integrated in the coagulation air flotation tank, and three processes of air flotation, coagulation and filtration are integrated in one treatment unit, so that the floor area of a treatment system is greatly reduced, and the possibility of installing wastewater treatment equipment on occasions with limited sites in tunnels is increased;

(2) the dissolved air releaser arranged annularly can ensure that micro bubbles are fully contacted with suspended matters in raw water and adhered to form a sludge floating layer, thereby greatly shortening the air floatation treatment time and achieving the purpose of improving the treatment efficiency; stirring and membrane filtration integrative subassembly can stir the water and realize fully coagulating, improves and thoughtlessly congeals efficiency, can filter the micro pollutant through the milipore filter again, has greatly promoted the quality of water that the system goes out water, to the characteristic pollutant of getting rid of in the tunnel waste water: the oil substances and SS have particularly remarkable effects;

(3) the wastewater treatment is carried out quantitatively and in different times by adopting an intermittent water inlet mode, and is combined with the staged treatment in each wastewater treatment process, so that the tunnel wastewater can meet the current comprehensive wastewater discharge standard after being treated by the system, and the treated water quality is stable and safer;

(4) the whole system has high automation degree and simple and convenient operation, and reduces the manual operation of a construction site.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a plan view of the dissolved air releaser mounted on the air distribution pipe.

Detailed Description

The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in fig. 1, the intermittent tunnel wastewater treatment system mainly comprises a coagulation air flotation tank 1, a water collecting tank 2, a slag collecting tank 3, an automatic control valve 4, an air distribution pipe 5, a dissolved air releaser 6, a rotating motor 7, a vacuum pump 8, blades 9, an ultrafiltration membrane 10, a dosing tank 11, a control cabinet 12, a water outlet pipe 13 and a sludge and sand discharge pipe 14.

The upper part of the coagulation air flotation tank 1 is provided with a water inlet and is connected with the water collecting tank 2 through a water inlet pipe. The tunnel wastewater firstly converges in the water collecting tank 2 and then is intermittently sent into the coagulation air floatation tank 1 for treatment, so that the water volume treated by the coagulation air floatation tank 1 is ensured to be constant, and the situation that new tunnel wastewater continuously flows in the treatment process can not occur; intermittent water feeding is adopted, so that the water quantity treated each time is constant, and the water quality stably reaches the standard; because the water quantity treated each time is controllable, the whole system can adopt a miniaturized design, occupies small space and is particularly suitable for occasions with limited sites in tunnels.

The coagulation air flotation tank 1 is internally provided with a stirring and membrane filtration integrated component, a dosing tank 11, an air distribution pipe 5 and a dissolved air releaser 6. The stirring and membrane filtration integrated component integrates stirring and filtration functions and comprises a paddle 9, an ultrafiltration membrane 10, a rotating motor 7, a vacuum pump 8 and a water outlet pipe 13. The paddle 9 is arranged outside the ultrafiltration membrane 10 in a surrounding mode, and the rotating motor 7 is used for driving the paddle 9 to rotate and stirring the water body. The vacuum pumping pump 8 is used for vacuumizing the inner cavity of the ultrafiltration membrane 10, so that water outside the ultrafiltration membrane 10 enters the inner cavity after being filtered by the ultrafiltration membrane 10 under the action of negative pressure. One end of the water outlet pipe 13 extends into the inner cavity of the ultrafiltration membrane 10, and the other end vertically penetrates through the ultrafiltration membrane 10 and extends out of the coagulation air flotation tank 1, so as to discharge water filtered by the ultrafiltration membrane 10. The dosing box 11 is connected with the control cabinet 12, and the control cabinet 12 controls the dosing amount.

Referring to fig. 1 and 2, the air distribution pipe 5 is annular and located below the stirring and membrane filtration integrated assembly, and mounting support legs are arranged on the left side and the right side of the air distribution pipe 5 and used for being fixedly mounted on the coagulation air flotation tank 1. The dissolved air releasers 6 are uniformly distributed on the air distribution pipe 5 in a circumference way. The dissolved air releaser 6 is preferably six, but not limited to 6. Vertical tubes 5a which are in one-to-one correspondence with the dissolved air releasers 6 are arranged below the air distribution tube 5, the vertical tubes 5a are communicated with the air distribution tube 5, and the tail end of each vertical tube 5a is provided with one dissolved air releaser 6

The bottom of the coagulation air flotation tank 1 is provided with a sludge and sand discharge pipe 14 for discharging flocculates and gravel to a sludge discharge and collection tank. The upper part of the coagulation air flotation tank 1 is provided with an overflow port and is connected with the slag collecting tank 3 through an overflow pipe, and the water inlet pipe, the water outlet pipe 13, the sludge and sand discharge pipe 14 and the overflow pipe are respectively provided with an automatic control valve 4.

Preferably, the number of the blades 9 is four, and the blades are circumferentially and uniformly distributed outside the ultrafiltration membrane 10, but is not limited to four.

The top of the coagulation air flotation tank 1 is provided with a cover plate for installing a rotating motor 7 and a vacuum pumping pump 8, and a water outlet pipe 13 downwards penetrates out of the bottom of the coagulation air flotation tank 1. The rotary motor 7, the vacuum pumping pump 8 and the water outlet pipe 13 are arranged in a vertically staggered manner, and arrangement is facilitated.

The coagulation air flotation tank 1 and the slag collecting tank 3 are combined, and the arrangement position of the water collecting tank 2 is determined according to the waste water generation position and the waste water yield.

An intermittent tunnel wastewater treatment process comprises the following steps:

s1, controlling the opening of an automatic control valve 4 on a water inlet pipe of the coagulation air flotation tank 1 by the control cabinet 12, and controlling the water inlet time of the system; after the water inlet is finished, the dissolved air releaser 6 starts to work, supersaturated air is released to form micro bubbles, the micro bubbles are rapidly attached to suspended matters, the suspended matters are lifted to the surface of the coagulation air flotation tank 1 to form a sludge floating layer, the automatic control valve 4 on the control cabinet 12 controls the overflow pipe to be opened, the sludge floating layer is discharged into the slag collecting tank 3, and the first-stage reaction is finished.

S2, the control cabinet 12 controls the dosing tank 11 to dose the coagulant into the coagulation air flotation tank 1, meanwhile, the rotating motor 7 starts to work, and the blades 9 start to rotate, so that the coagulant is fully mixed with the water body; after the coagulation reaction is finished, the control cabinet 12 opens the automatic control valve 4 on the sludge and sand discharge pipe 14 at the bottom of the coagulation air flotation tank 1, discharges sludge and gravel out of the system, and the second stage reaction is finished.

And S3, controlling the vacuum pump 8 to start running by the control machine room 12 and simultaneously opening the automatic control valve 4 of the water outlet pipe 13 to generate negative pressure in the ultrafiltration membrane 10, starting filtering the water body in the coagulation air flotation tank 1, finally discharging the treated tunnel wastewater through the water outlet pipe 13, finishing the reaction in the third stage and finishing one-time intermittent tunnel wastewater treatment.

And S4, repeating S1-S3, and carrying out the next batch type tunnel wastewater treatment.

Claims (4)

1. The utility model provides an intermittent type formula tunnel effluent disposal system, includes coagulation air supporting pond (1), catch basin (2), collection sediment pond (3) and switch board (12), its characterized in that: the upper part of the coagulation air flotation tank (1) is provided with a water inlet and is connected with the water collecting tank (2) through a water inlet pipe, the coagulation air flotation tank (1) is internally provided with a stirring and membrane filtering integrated assembly, a dosing tank (11), an air distribution pipe (5) and a dissolved air releaser (6), the stirring and membrane filtering integrated assembly comprises a paddle (9), an ultrafiltration membrane (10), a rotating motor (7), a vacuum-pumping pump (8) and a water outlet pipe (13), the paddle (9) is arranged outside the ultrafiltration membrane (10) in a surrounding manner, the rotating motor (7) is used for driving the paddle (9) to rotate, the vacuum-pumping pump (8) is used for vacuumizing the inner cavity of the ultrafiltration membrane (10), so that water outside the ultrafiltration membrane (10) enters the inner cavity after being filtered by the ultrafiltration membrane (10), one end of the water outlet pipe (13) extends into the inner cavity of the ultrafiltration membrane (10), and the other end vertically penetrates out of the ultrafiltration membrane (10) and extends out of the coagulation air flotation tank (1), used for discharging the water filtered by the ultrafiltration membrane (10); the gas distribution pipe (5) is annular and is positioned below the stirring and membrane filtering integrated component, and the dissolved gas releasers (6) are uniformly distributed on the gas distribution pipe (5) in a circumferential manner; a sludge and sand discharge pipe (14) is arranged at the bottom of the coagulation air floatation tank (1), an overflow port is arranged at the upper part of the coagulation air floatation tank (1) and is connected with the slag collecting tank (3) through an overflow pipe, and automatic control valves (4) are respectively arranged on the water inlet pipe, the water outlet pipe (13), the sludge and sand discharge pipe (14) and the overflow pipe;

the four blades (9) are uniformly distributed outside the ultrafiltration membrane (10) in a circumferential manner;

the top of the coagulation air flotation tank (1) is provided with a cover plate for installing a rotating motor (7) and a vacuum pumping pump (8), and a water outlet pipe (13) penetrates out of the bottom of the coagulation air flotation tank (1) downwards.

2. The batch tunnel wastewater treatment system according to claim 1, characterized in that: the coagulation air flotation tank (1) and the slag collecting tank (3) are jointly built.

3. The batch tunnel wastewater treatment system according to claim 1, characterized in that: dissolved air releaser (6) totally six, be provided with below gas distribution pipe (5) with dissolved air releaser (6) one-to-one vertical pipe (5a), vertical pipe (5a) communicate with each other with gas distribution pipe (5), and dissolved air releaser (6) are installed to the end of every vertical pipe (5 a).

4. A batch type tunnel wastewater treatment process, characterized by comprising the batch type tunnel wastewater treatment system according to any one of claims 1 to 3, and comprising the steps of:

s1, controlling an automatic control valve (4) on a water inlet pipe of the coagulation air flotation tank (1) to open by a control cabinet (12), and controlling the water inlet time of the system; after water inflow is finished, the dissolved air releaser (6) starts to work, supersaturated air is released to form micro bubbles, the micro bubbles are quickly attached to suspended matters, the suspended matters are lifted to the surface of the coagulation air flotation tank (1) to form a sludge floating layer, the control cabinet (12) controls the automatic control valve (4) on the overflow pipe to be opened, the sludge floating layer is discharged into the slag collecting tank (3), and the first-stage reaction is finished;

s2, the control cabinet (12) controls the dosing tank (11) to dose coagulant into the coagulation air flotation tank (1), meanwhile, the rotating motor (7) starts to work, and the blades (9) start to rotate, so that the coagulant is fully mixed with the water body; after the coagulation reaction is finished, the control cabinet (12) opens an automatic control valve (4) on a sludge and grit discharge pipe (14) at the bottom of the coagulation air floatation tank (1) to discharge sludge and grit out of the system, and the second-stage reaction is finished;

s3, controlling a vacuum pump (8) to start running by a control machine room (12) and simultaneously opening an automatic control valve (4) of a water outlet pipe (13) to generate negative pressure in an ultrafiltration membrane (10), starting filtering a water body in a coagulation air flotation tank (1), finally discharging the treated tunnel wastewater through the water outlet pipe (13), finishing the reaction in the third stage and finishing one-time intermittent tunnel wastewater treatment;

and S4, repeating S1-S3, and carrying out the next batch type tunnel wastewater treatment.

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