Wastewater treatment system for tunnel construction

Abstract

The utility model relates to the technical field of wastewater treatment, and provides a wastewater treatment system for tunnel construction, which comprises a pre-sedimentation tank, an adjusting tank, a neutralization reaction tank, a purification reactor, a clean water tank, a sludge tank, a plate-and-frame filter press and a dosing control room. The pre-sedimentation tank adopts gravity settling to separate large-particle suspended matters, the bottom inclined plane design guides the settled matters to converge into a sedimentation tank, and uniform water distribution is realized through a plurality of equidistant sedimentation through holes between a buffer area and the pre-sedimentation tank, so that turbulence is prevented from interfering the sedimentation efficiency; and the adjusting tank provides stable input for neutralization reaction. After wastewater and sludge are separated by the purification reactor, the wastewater is introduced into a neutralization reaction tank for further treatment, and the sludge is dehydrated by a plate-and-frame filter press to form a mud cake for safe treatment; the neutralization reaction tank adopts COgas to neutralize high-alkalinity wastewater, traditional acid liquor treatment is replaced, corrosion and operation potential safety hazards are eliminated, and treated clear water is reused for greening or discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially a wastewater treatment system for tunnel construction. BACKGROUND

[0002] In recent years, with the rapid development of tunnel engineering construction in China, the environmental pollution problem generated by tunnel construction is increasingly prominent. Tunnel construction wastewater is one of the main sources of environmental pollution, and the wastewater is mainly derived from gushing water when passing through poor geological units, drilling wastewater of construction surface, dust removal wastewater after blasting, shotcrete and grouting wastewater, and bedrock fissure water, etc. These wastewaters usually contain high concentration of suspended solids (SS) and present high alkalinity, and the water quality and water quantity have great volatility. The traditional treatment process has problems of low treatment efficiency, large land occupation, high operation cost, etc., and it is difficult to meet the modern engineering environmental protection requirements.

[0003] Therefore, it is urgent to develop a wastewater treatment system for tunnel construction to overcome the shortcomings of the prior art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the problems of the prior art, and provides a wastewater treatment system for tunnel construction to improve wastewater treatment efficiency and reduce wastewater treatment cost.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A wastewater treatment system for tunnel construction comprises a pre-sedimentation tank, an adjusting tank directly communicated with the pre-sedimentation tank, a clear water tank and a sludge tank arranged on one side of the adjusting tank, a neutralization reactor, a purification reactor, and a plate-and-frame filter press.

[0007] The adjusting tank is communicated with the water inlet of the purification reactor, the water outlet of the purification reactor is communicated with the water inlet of the neutralization reactor, the sludge outlet of the purification reactor is communicated with the sludge tank, the water outlet of the neutralization reactor is communicated with the clear water tank, the sludge tank is communicated with the water inlet of the plate-and-frame filter press, and the water outlet of the plate-and-frame filter press is communicated with the adjusting tank. The wastewater in the adjusting tank is pumped into the purification reactor by a sewage lifting pump. The slurry in the sludge tank is pumped into the plate-and-frame filter press by a slurry pump.

[0008] Preferably, a buffer zone is arranged on one side of the pre-sedimentation tank, one side of the buffer zone is communicated with a water inlet tank, the other side of the buffer zone is communicated with the pre-sedimentation tank, a sedimentation groove is arranged below the side of the pre-sedimentation tank close to the buffer zone, a slurry pump is arranged in the sedimentation groove, the slurry in the sedimentation groove is pumped into the sludge tank by the slurry pump, and the buffer zone and the pre-sedimentation tank are communicated by a plurality of equidistantly and regularly arranged sedimentation through holes.

[0009] Preferably, the bottom of the pre-sedimentation tank is a slope, and the end of the slope is connected with the top of the sedimentation groove.

[0010] Preferably, the pre-sedimentation tank and the equalization tank are connected by an equalization through hole, and a right-angle retaining wall is provided on the side of the through hole near the pre-sedimentation tank.

[0011] Preferably, a pump pit is provided on one side of the regulating pool, the bottom surface of the regulating pool is inclined, and the end of the inclined surface is connected to the top of the pump pit.

[0012] Preferably, the clear water pool is also connected to a water storage pool, and a pump pit is provided on one side of the clear water pool. The bottom surface of the clear water pool is sloping, and the end of the sloping surface is connected to the top of the pump pit. The clear water in the clear water pool is pumped into the water storage pool through a water pump.

[0013] Preferably, the pre-sedimentation tank is divided into two chambers, which are separated by a partition wall, and the partition wall has sludge deposition holes at the sedimentation tank.

[0014] This utility model discloses a wastewater treatment system for tunnel construction, which has the following beneficial effects.

[0015] This utility model includes a pre-sedimentation tank, an equalization tank, a neutralization reaction tank, a purification reactor, a clear water tank, and a sludge tank, equipped with a plate and frame filter press and a chemical dosing control room. The pre-sedimentation tank uses gravity sedimentation to separate large suspended particles. Its sloping bottom design guides the sediment into the sedimentation tank, and multiple equidistant sedimentation holes between the buffer zone and the pre-sedimentation tank ensure uniform water distribution, avoiding turbulence interference with sedimentation efficiency. The equalization tank provides a stable input for the neutralization reaction. After separating wastewater and sludge in the purification reactor, the wastewater is further treated in the neutralization reaction tank, while the sludge is dewatered by the plate and frame filter press to form sludge cake for safe disposal. The neutralization reaction tank uses CO2 gas to neutralize highly alkaline wastewater, replacing traditional acid treatment, eliminating corrosion and operational safety hazards. The treated clear water is reused for landscaping or discharge. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the plan layout of this utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of section AA.

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of section BB.

[0019] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the CC section.

[0020] In the attached diagram: 1. Pre-sedimentation tank; 101. Buffer zone; 102. Sedimentation tank; 103. Sludge sedimentation hole; 104. Partition wall; 105. Main inlet pipe; 106. Sedimentation through hole; 2. Equalization tank; 201. Equalization through hole; 202. Baffle wall; 3. Neutralization reaction tank; 4. Purification reactor; 5. Clear water tank; 6. Sludge tank; 7. Plate and frame filter press; 8. Water storage tank; 9. Dosing and control room; 10. Pump pit; 11. Ground foundation. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example

[0023] Reference Figure 1As shown, a wastewater treatment system for tunnel construction includes: a pre-sedimentation tank 1, an equalization tank 2 directly connected to the pre-sedimentation tank 1, a clear water tank 5 and a sludge tank 6 located on one side of the equalization tank 2, a neutralization reaction tank 3, a purification reactor 4, and a plate and frame filter press 7; the equalization tank 2 and the inlet of the purification reactor 4 are connected by a pipeline, the outlet of the purification reactor 4 and the inlet of the neutralization reaction tank 3 are connected by a pipeline, the sludge outlet of the purification reactor 4 and the sludge tank 6 are connected by a pipeline, the outlet of the neutralization reaction tank 3 and the clear water tank 5 are connected by a pipeline, the sludge tank 6 and the inlet of the plate and frame filter press 7 are connected by a pipeline, and the outlet of the plate and frame filter press 7 and the equalization tank 2 are connected by a pipeline; the wastewater in the equalization tank 2 is pumped into the neutralization reaction tank 3 by a wastewater lift pump; the sludge in the sludge tank 6 is pumped into the plate and frame filter press 7 by a sludge pump, and the water in the outlet of the plate and frame filter press 7 is pumped back to the equalization tank 2. Pre-sedimentation tank 1 is used to initially remove large particulate suspended solids from the wastewater, reducing the load on subsequent treatment equipment through gravity settling. Equalization tank 2 homogenizes the wastewater quality and quantity, providing a stable flow rate and component input for subsequent neutralization treatment. Purification reactor 4 efficiently removes residual suspended solids and impurities from the wastewater. Neutralization reaction tank 3 introduces CO2 gas to neutralize highly alkaline substances in the wastewater, adjusting the pH value to a suitable range, significantly reducing safety hazards caused by corrosion and operational risks in traditional acid treatment technologies. Clear water tank 5 is used to store the purified wastewater. The effluent can be used for greening irrigation, site dust spraying, or discharged into surface water bodies in compliance with standards. The sludge tank 6 and the plate and frame filter press 7 are responsible for treating the sludge generated by the system. The sludge is transported to the filter press by a mud pump. The sludge cake after pressing is collected and disposed of safely to avoid secondary pollution. The effluent from the plate and frame filter press 7 is returned to the equalization tank 2. In this embodiment, a chemical dosing and control room 9 is also provided to store chemicals and control the operation of pipe valves and water pumps. In this embodiment, the pre-sedimentation tank 1, equalization tank 2, clear water tank 5, and sludge tank 6 are all excavated above and below the ground foundation 11.

[0024] The wastewater treatment process in this embodiment is as follows: Wastewater undergoes gravity sedimentation in the pre-sedimentation tank 1, and the supernatant of the wastewater flows into the equalization tank 2. The equalization tank 2 buffers the supernatant and pumps it into the inlet of the neutralization reaction tank 3. The neutralization reaction tank 3 introduces CO2 gas to neutralize the highly alkaline substances in the wastewater. The CO2 is provided by the CO2 storage tank and then flows from the outlet of the neutralization reaction tank 3 into the inlet of the purification reactor 4. The purification reactor 4 can efficiently remove residual suspended solids and impurities in the wastewater, separating the clean water from the impurities. The impurities are pumped into the sludge tank 6 by a mud pump, and the clean water is pumped into the clean water tank 5. The sludge in the sludge tank 6 is pumped into the plate and frame filter press 7 for filtration. The dried sludge cake is collected and disposed of safely.

[0025] The equalization tank 2 buffers the supernatant and pumps it into the inlet of the purification reactor 4. The purification reactor 4 can efficiently remove residual suspended solids and impurities from the wastewater, separating the wastewater from the impurities. The impurities are pumped into the sludge tank 6 via a mud pump, while the wastewater is pumped into the inlet of the neutralization reaction tank 3. The neutralization reaction tank 3 introduces CO2 gas to neutralize the highly alkaline substances in the wastewater. The CO2 is provided by a CO2 storage tank. The clean water is pumped from the outlet of the neutralization reaction tank 3 into the clean water tank 5. The sludge in the sludge tank 6 is pumped into the plate and frame filter press 7 for filtration. The dried sludge cake is collected and disposed of safely.

[0026] In this embodiment, the purification reactor 4 is a commercially available HG high-efficiency purification reactor, model HGJS-500, and the neutralization reaction tank 3 is a commercially available high-alkalinity wastewater treatment device, model HG-GXCQ250. The HG high-efficiency purification reactor used in this embodiment is a high-efficiency integrated coagulation and sedimentation device, divided into four parts: a coagulation zone, a flocculation zone, a pre-sedimentation zone, and an inclined plate sedimentation tank. First, coagulant is added to the raw water, and the coagulant is rapidly mixed with the raw water by the stirring action of the agitator. Then, the water enters the flocculation tank, where more flocculant is added. Under the stirring action of the agitator in the tank, suspended solids in the water are sheared, reforming into larger, easily settling flocs. The water then enters the sedimentation tank, which is divided into a pre-sedimentation zone and an inclined plate sedimentation zone. In the pre-sedimentation zone, easily settling flocs settle rapidly, while small flocs that do not settle quickly are captured by the inclined plates. The sediment exits through the sludge outlet, and then the high-quality effluent is collected through the water collection trough at the top of the tank and discharged through the water outlet to the neutralization reaction tank 3. The high-alkalinity wastewater treatment device used in this embodiment employs carbon dioxide dissolved in the wastewater through a jet device to form carbonic acid, neutralizing the high-alkalinity wastewater. CO2 replaces inorganic acids such as hydrochloric acid and sulfuric acid, making it more environmentally friendly. Furthermore, carbon dioxide is compressible and liquefiable, facilitating transportation and storage. The outlet of the neutralization reaction tank 3 is connected to the clear water tank 5, which can serve as a temporary storage tank for reclaimed water and also as a disinfection contact tank. The effluent from the clear water tank 5 can be reused or discharged in compliance with standards.

[0027] like Figure 2 and Figure 3 As shown, in this preferred embodiment, a buffer zone 101 is provided on one side of the pre-sedimentation tank 1. One side of the buffer zone 101 is connected to the incoming water tank through the main inlet pipe 105. The other side of the buffer zone 101 is connected to the pre-sedimentation tank 1. A sedimentation tank 102 is provided below the side of the pre-sedimentation tank 1 near the buffer zone 101. A mud pump is provided in the sedimentation tank 102. The mud in the sedimentation tank 102 is pumped into the sludge tank 6 through the mud pump. The buffer zone 101 and the pre-sedimentation tank 1 are connected through 224 sedimentation through holes 106 arranged at equal intervals. The sedimentation through holes 106 make the water flow more uniform and avoid the water flow causing turbulence and reducing the sedimentation efficiency of the pre-sedimentation tank 1.

[0028] Preferably, in this embodiment, the bottom of the pre-sedimentation tank 1 is an inclined surface, and the end of the inclined surface is connected to the top of the sedimentation tank 102, which facilitates the entry of sediments into the sedimentation tank 102.

[0029] like Figure 4 As shown, in this embodiment, the pre-sedimentation tank 1 and the equalization tank 2 are connected by an equalization through hole 201. A right-angle baffle 202 is provided on the side of the through hole near the pre-sedimentation tank 1. The right-angle baffle 202 can control the liquid level depth entering the equalization through hole 201, so that the supernatant can be passed to the equalization tank 2.

[0030] Preferably, in this embodiment, a pump pit 10 is provided on one side of the regulating tank 2, the bottom surface of the regulating tank 2 is a slope, and the end of the slope is connected to the top of the pump pit 10.

[0031] As a preferred embodiment, in this embodiment, the clear water tank 5 is also connected to the water storage tank 8 through a pipe. A pump pit 10 is provided on one side of the clear water tank 5. The bottom surface of the clear water tank 5 is a slope, and the end of the slope is connected to the top of the pump pit 10. The clear water in the clear water tank 5 is pumped into the water storage tank 8 through a water pump.

[0032] Preferably, in this embodiment, the pre-sedimentation tank 1 is divided into two chambers, which are separated by a partition wall 104. The partition wall 104 is provided with a sludge deposition hole 103 at the sedimentation tank 102.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Substitutions may include replacements for some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the scope of protection of this utility model.

Claims

1. A wastewater treatment system for tunnel construction, characterized by, The utility model relates to a sewage treatment device, including: a pre-sedimentation tank (1), a regulating tank (2) directly communicated with the pre-sedimentation tank (1), a clear water tank (5) and a sludge tank (6) arranged at one side of the regulating tank (2), a neutralization reaction tank (3), a purification reactor (4), and a plate-and-frame filter press (7); the regulating tank (2) is communicated with an inlet of the purification reactor (4), an outlet of the purification reactor (4) is communicated with an inlet of the neutralization reaction tank (3), a sludge outlet of the purification reactor (4) is communicated with the sludge tank (6), an outlet of the neutralization reaction tank (3) is communicated with the clear water tank (5), the sludge tank (6) is communicated with an inlet of the plate-and-frame filter press (7), and an outlet of the plate-and-frame filter press (7) is communicated with the regulating tank (2); wastewater in the regulating tank (2) is pumped into the purification reactor (4) through a sewage lifting pump; and slurry in the sludge tank (6) is pumped into the plate-and-frame filter press (7) through a slurry pump.

2. A wastewater treatment system for tunnel construction according to claim 1, characterized in that One side of the pre-sedimentation tank (1) is provided with a buffer area (101), one side of the buffer area (101) is communicated with a water inlet tank, the other side of the buffer area (101) is communicated with the pre-sedimentation tank (1), a deposition groove (102) is arranged at the lower side of the pre-sedimentation tank (1) close to the buffer area (101), a slurry pump is arranged in the deposition groove (102), slurry in the deposition groove (102) is pumped into the sludge tank (6) through the slurry pump, and the buffer area (101) and the pre-sedimentation tank (1) are communicated through a plurality of equidistantly and regularly arranged deposition through holes (106).

3. A wastewater treatment system for tunnel construction according to claim 2, characterized in that The bottom of the pre-sedimentation tank (1) is a slope, and the end of the slope is connected with the top of the deposition groove (102).

4. A wastewater treatment system for tunnel construction according to claim 1, characterized in that, The pre-sedimentation tank (1) and the regulating tank (2) are connected through a regulating through hole (201), and a right-angle retaining wall (202) is arranged at the side of the regulating through hole close to the pre-sedimentation tank (1).

5. A wastewater treatment system for tunnel construction according to claim 1, characterized in that, One side of the regulating tank (2) is provided with a pump pit (10), and the bottom surface of the regulating tank (2) is a slope, and the end of the slope is connected with the top of the pump pit (10).

6. A wastewater treatment system for tunnel construction according to claim 1, characterized in that The clear water tank (5) is also communicated with a water storage tank (8), one side of the clear water tank (5) is provided with a pump pit (10), the bottom surface of the clear water tank (5) is a slope, and the end of the slope is connected with the top of the pump pit (10), and clear water in the clear water tank (5) is pumped into the water storage tank (8) through a water pump.

7. A wastewater treatment system for tunnel construction according to claim 2, characterized in that, The pre-sedimentation tank (1) is divided into two chambers, the two chambers are separated by a partition wall (104), and the partition wall (104) is provided with a deposition sludge hole (103) at the deposition groove (102).

Images