CN204714625U - Constructing tunnel advanced sewage treatment system - Google Patents

Abstract

The utility model discloses a tunnel sewage advanced treatment system, which is characterized in that: the grit chamber (1) of the system is provided with a tunnel sewage inlet, and the grit chamber (1) exits through the dosing tank (2) and the oil separation tank. The inlet of the sedimentation tank (3) is connected; the oily waste water outlet of the oil-separating sedimentation tank (3) is connected to the inlet of the sand filter tank (5) through the air flotation filter equipment (4), and the oil-separating liner ruler (3) is not The waste water outlet is directly connected to the inlet of the sand filter tank (5); the outlet of the sand filter tank (5) is connected to the inlet of the activated carbon filter tank (6); the outlet of the activated carbon filter tank (6) is connected to the reuse water pool (7). The use of the whole set of system equipment can effectively purify various pollutants in the wastewater discharged from the tunnel, and avoid the pollution of nearby water sources by the sewage discharge during the construction process.

Description

Tunnel Construction Sewage Advanced Treatment System

technical field

The utility model relates to the field of sewage treatment, in particular to an advanced treatment system for tunnel construction sewage.

Background technique

In tunnel construction, tunnel drainage treatment is an important task. In order to avoid pollution of nearby water sources by sewage discharge during construction, a sewage treatment station needs to be added near the tunnel construction site. The treatment capacity of the sewage treatment station mainly considers two aspects: the amount of sewage water and the water quality of sewage.

The water quality of the tunnel is mainly ground water with relatively pure components, and the main pollutants are the solid suspended matter mixed along the way. The water volume of tunnel sewage is relatively complicated, mainly in the following aspects: it is related to the water inflow in the construction tunnel body; it is related to the length of construction footage; it is related to the speed of lining completion follow-up; it can meet the production water required by the construction process; The amount of accumulated water in the rainy season from the entrance of the cave to the treatment station, etc.

Utility model content

The technical problem to be solved by the utility model is: to provide an advanced treatment system for tunnel construction sewage, which comprehensively adopts simple and feasible advanced treatment processes such as sand settling, coagulation sedimentation process, oil separation and air flotation treatment process, sand filter, activated carbon, etc., to realize The virtuous recycling of tunnel wastewater.

The technical problem to be solved by the utility model is achieved through the following technical solutions:

A tunnel sewage advanced treatment system, the grit chamber of the system is provided with a tunnel sewage inlet, and the grit chamber outlet is connected to the oil separation sedimentation tank entrance through the chemical dosing tank; the oily waste water outlet of the oil separation sedimentation tank is passed through the air flotation The filter equipment is connected to the inlet of the sand filter tank, and the outlet of the oil-separating liner ruler that does not contain waste water is directly connected to the inlet of the sand filter tank; the outlet of the sand filter tank is connected to the inlet of the activated carbon filter tank; the outlet of the activated carbon filter tank is connected to the reuse water pool.

The grit chamber adopts an advection type grit chamber, and the grit chamber is divided into two grids. The grit chamber is a facility for the separation of mud and water before the treatment of structures. The separated sediments are mostly sand with large particles. The proportion of sediments is relatively large, the inorganic components are high, and the water content is low. Sewage will inevitably be mixed with mud and sand in the process of migration, flow and collection. If the sand in the sewage is not pre-sedimented and separated, it will affect the operation of subsequent treatment equipment. The most important thing is to wear the machine pump, block the pipe network, interfere or even destroy the biochemical treatment process. The number of seats or divisions of the advection grit chamber should not be less than two, and it should be designed as a parallel series. When the amount of sewage is small, one is reserved and the other is used; when it is large, it should work at the same time. The grid advection grit chamber is a commonly used type of pond, and the sewage flows in the horizontal direction in the pond, which has the advantages of simple structure and good effect of intercepting inorganic particles.

The oil separation sedimentation tank is also provided with an oil outlet, and the oil outlet is externally connected to an oil collecting barrel.

The height of the water outlet of the grit chamber and the oil separation sedimentation tank is lower than that of the water inlet; the height of the water outlet of the sand filter tank is higher than the water inlet.

The oily wastewater inlets of the dosing tank and the oil-separating sedimentation tank are respectively externally connected with a dosing machine.

The technical effect that the utility model adopts above-mentioned technical scheme to have is:

(1) Reasonably determine the processing capacity of the sewage treatment station, properly consider the sudden increase in water inflow, and improve the processing capacity of the sewage station in response to emergencies;

(2) According to the type and content of actual tunnel sewage pollutants, a reasonable treatment process is adopted. For example, for the treatment of tunnel sewage without oil pollutants in general requirements, sand settling + coagulation sedimentation process should be adopted, and oily sewage should be mixed Coagulation sedimentation + air flotation degreasing process, for tunnel sewage treatment with requirements, coagulation sedimentation + advanced treatment (sand filter, activated carbon, etc.) process should be adopted;

(3) Reasonable use of natural topography and landforms, reasonable design of the elevation of each structure, minimizing the power lift in the middle of sewage treatment, so that each structure operates under the hydraulic conditions of gravity flow.

Description of drawings

Below in conjunction with accompanying drawing, the utility model will be further described

Fig. 1 is the utility model processing flowchart

Among them, 1-grit chamber, 2-dosing tank, 3-oil separation sedimentation tank, 4-air flotation filter equipment, 5-sand filter tank, 6-activated carbon filter tank, 7-reuse water tank, 8-oil collection barrel, 9-dosing machine

Detailed ways

A kind of tunnel sewage advanced treatment system as shown in Figure 1, the grit chamber 1 of this system is provided with the tunnel sewage inlet, and the grit chamber 1 outlet communicates with the oil separation sedimentation tank 3 inlets via the dosing tank 2; The oily wastewater outlet of the oil sedimentation tank 3 is connected to the sand filter tank 5 inlet through the air flotation filter equipment 4, and the waste water outlet of the oil-separating liner 3 is directly connected to the sand filter tank 5 inlet; the sand filter tank 5 outlet is connected to the sand filter tank 5 inlet. The inlet of the activated carbon filter tank 6 is communicated; the outlet of the activated carbon filter tank 6 is communicated with the reuse pool 7 . The use of the whole set of system equipment can effectively purify the wastewater discharged from the tunnel, and avoid the pollution of nearby water sources caused by the sewage discharge during the construction process.

Sewage pollutants generated during tunnel construction mainly include the following aspects:

Solid suspended particles SS: Some tunnels are excavated by drill and blast method, and the water quality of the tunnel sewage is mainly due to the excessive content of solid suspended particles SS. The body of the tunnel is mainly composed of maroon, brownish red mudstone and cyan gray, reddish brown sandstone, shale and conglomerate. During the drilling and blasting process of machinery and tools, tiny particles and dust are produced, which are mixed with the tunnel water and passed through the construction machinery. In the design process, the concentration of suspended solids in sewage is 1600mg/L, and the actual concentration of suspended solids in actual construction is 2200-2800mg/L. Therefore, the method of coagulation and sedimentation is mainly considered in the design to remove This part of the pollutant;

Oil pollution: Another item with a relatively high content in sewage is oil pollution, which mainly comes from construction machinery and sudden equipment oil leakage. The actual concentration of oil pollutants is 5-10mg/L, so integrated gas is used in the design Float filtration equipment removes small amounts of oily sewage.

Ph: Since the tunnel excavation is constructed by drilling and blasting method, the main component of the emulsion explosive is ammonium nitrate, which will affect the acidity and alkalinity of the water quality after being dissolved in water. In addition, the concrete construction will also lead to changes in the acidity and alkalinity of the water quality, which can be detected by the water quality test report The Ph value of sewage water quality is generally 9-10. Therefore, the adjustment of the Ph value of the sewage water quality should also be considered in the design of the treatment.

The utility model has a multi-stage classification treatment method for the above-mentioned pollutants, and uses unused treatment links to purify corresponding pollutants respectively.

The grit chamber 1 adopts an advection type grit chamber, and the grit chamber 1 is divided into two compartments, and its main function is to remove larger inorganic particles.

The oil separation sedimentation tank 3 is also provided with an oil outlet, and the oil outlet is externally connected to the oil collecting drum 8 . The main function of the oil-separating sedimentation tank is to remove the sediment and larger particles of mechanical drilling and blasting products in the tunnel construction sewage, and to separate oil and water in the oil-separating mud collection area.

The main function of the air flotation filter equipment 4 is to remove small particles of oil and fine suspended matter in the sewage after the coagulation and sedimentation. Combined with the main performance indicators of the pollutants in the sewage, the oil separation process and the air flotation process are equipped with a coagulant Dosing, polyaluminum chloride (PAC) is selected as the coagulant, which can significantly improve the sewage treatment effect.

The main functions of the sand filter tank 5 and the activated carbon filter tank 6 are the advanced treatment and purification of sewage, in order to achieve a certain reuse water standard so that the sewage can be reused as a water resource for further water treatment in production or life.

The height of the water outlet of the grit chamber 1 and the oil separation sedimentation tank 3 is lower than that of the water inlet; the height of the water outlet of the sand filter tank 5 is higher than that of the water inlet. The overall system of the utility model adopts a straight layout, utilizes the natural terrain, rationally designs the elevation of each structure, minimizes the power lift in the middle of the sewage, and makes each structure operate under the hydraulic condition of gravity flow.

The oily wastewater inlets of the dosing tank 2 and the oil-separating sedimentation tank 3 are respectively connected with a dosing machine 9 . The dosing machine 9 adopts an integrated automatic dosing device, and the dosing pump adopts three functions and one standby, which are used alternately to ensure continuous coagulant preparation and dosing. Two medicine storage barrels are used, and the volume of the medicine cartridge is 2m ³ . PAC is used as the coagulant, and PAM is used as the coagulant aid. The dosage and concentration should be determined according to the amount of treated water and the concentration of suspended solids, and field tests.

It should be noted that the above specific implementations of the present utility model are only used to illustrate or explain the principle of the present utility model, but not to limit the present utility model. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model shall be included in the protection scope of the present utility model. Furthermore, the appended claims are intended to cover all changes and modifications that come within the scope and boundaries of the appended claims, or equivalents of such scope and boundaries.

Claims (5)

1. A tunnel sewage advanced treatment system is characterized in that: the grit chamber (1) of the system is provided with a tunnel sewage inlet, and the grit chamber (1) outlet passes through the dosing tank (2) and the oil separation sedimentation tank ( 3) The inlet is connected; the oily wastewater outlet of the oil-separating sedimentation tank (3) is connected to the inlet of the sand filter tank (5) through the air flotation filter equipment (4), and the outlet of the oil-separating liner (3) does not contain wastewater The inlet of the sand filter tank (5) is directly connected; the outlet of the sand filter tank (5) is communicated with the inlet of the activated carbon filter tank (6); the outlet of the activated carbon filter tank (6) is communicated with the reuse water pool (7). 2. The tunnel sewage advanced treatment system according to claim 1, characterized in that: the grit chamber (1) adopts an advection type grit chamber, and the grit chamber (1) is divided into two compartments. 3. The tunnel sewage advanced treatment system according to claim 1, characterized in that: the oil separation sedimentation tank (3) is also provided with an oil outlet, and the oil outlet is externally connected to an oil collecting barrel (8). 4. The tunnel sewage advanced treatment system according to claim 1, characterized in that: the water outlet height of the grit chamber (1) and the oil separation sedimentation tank (3) is lower than the water inlet height; the sand filter tank (5) The water outlet height is higher than the water inlet. 5. The tunnel sewage advanced treatment system according to claim 1, characterized in that: the entrances of the dosing tank (2) and the oily waste water of the oil-separating sedimentation tank (3) are respectively connected with dosing machines (9).