CN115818901A - Underground cavern production wastewater treatment system and method - Google Patents
Underground cavern production wastewater treatment system and method Download PDFInfo
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- CN115818901A CN115818901A CN202310020665.8A CN202310020665A CN115818901A CN 115818901 A CN115818901 A CN 115818901A CN 202310020665 A CN202310020665 A CN 202310020665A CN 115818901 A CN115818901 A CN 115818901A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 title claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 362
- 239000002351 wastewater Substances 0.000 claims abstract description 94
- 238000011001 backwashing Methods 0.000 claims abstract description 83
- 239000010802 sludge Substances 0.000 claims abstract description 70
- 238000005406 washing Methods 0.000 claims abstract description 58
- 238000004062 sedimentation Methods 0.000 claims abstract description 52
- 239000002253 acid Substances 0.000 claims abstract description 30
- 239000000701 coagulant Substances 0.000 claims abstract description 30
- 239000000645 desinfectant Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000008394 flocculating agent Substances 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 9
- 230000018044 dehydration Effects 0.000 claims abstract description 5
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 5
- 239000000706 filtrate Substances 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000011045 prefiltration Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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Abstract
The invention provides a system and a method for treating production wastewater of an underground cavern, wherein the wastewater is lifted to a sedimentation tank by a first wastewater lifting pump after entering an adjusting tank, a submersible mixer is arranged in the adjusting tank, acid and a flocculating agent are added before entering the sedimentation tank, supernatant in the sedimentation tank overflows to an intermediate water tank, the wastewater in the intermediate water tank is lifted to a mechanical filter by a pressure pump before filtration and then is mixed with a disinfectant to enter a clean water tank, the disinfected clean water is recycled to a water using point, and a forward washing unit and a backwashing unit are arranged on a filter material in the mechanical filter. Sludge in the sedimentation tank is conveyed to a sludge tank through gravity flow or pressure flow, supernatant in the sludge tank flows back to the regulating tank, the sludge in the sludge tank is lifted to a plate-and-frame filter press through a sludge lifting pump for dehydration, a coagulant aid is added before entering the sludge lifting pump, filtrate enters the regulating tank, and mud cakes are transported outside. The invention can effectively treat the production wastewater of the underground cavern and has the characteristics of stable system operation, small occupied area and stable effluent quality reaching the standard.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a system and a method for treating production wastewater of an underground cavern.
Background
The underground cavern production wastewater mainly comprises tunnel construction wastewater and cavern seepage water. The production wastewater sources of the tunnel or underground cavern project comprise excavation operation wastewater, water for concrete curing or drilling in a supporting link, water for construction production and mechanical equipment cleaning and the like. In addition, under the influence of geological conditions and underground water levels, underground water easily gushes out from tunnels or underground cavern engineering in excavation and use links, and the water quality of the gushing water is often similar to that of the regional underground water. However, underground water gushing is easy to mix with construction wastewater in the process of excavating the cavern, so that mixed wastewater containing a large amount of suspended matters is formed, main pollutants are suspended matters, and the concentration of the suspended matters is about 2900 mg/L. The drainage point of the cavern waste water changes along with the movement of the construction working surface, the quantity of the waste water is influenced by various uncertain factors such as underground water distribution condition of the area where the project is located, local climate, precipitation and the like, and the change range is large.
With the increasing requirements of water pollution treatment in China in recent years, the production wastewater of underground caverns usually needs to be treated and recycled. At present, the treatment process of the production wastewater of the underground cavern has the problems of unstable operation, large occupied area, substandard effluent quality and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system and a method for treating production wastewater of an underground cavern, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides an underground cavern production wastewater treatment system, which comprises: the device comprises an adjusting tank (1), a sedimentation tank (2), an intermediate water tank (3), a mechanical filter (4), a sludge tank (5), a plate-and-frame filter press (6), a clean water tank (7), a water collecting tank (35), a mechanical filter water inlet (30), a mechanical filter water outlet (31) and auxiliary equipment; wherein the auxiliary equipment comprises a submersible mixer (8), a first wastewater lifting pump (9), a mud scraper or suction dredge (10), a pre-filtration pressurizing pump (11), a clear water lifting pump (12), a sludge lifting pump (14) and a second wastewater lifting pump (15);
a submersible stirrer (8) is arranged in the adjusting tank (1); a water suction pipe is arranged at the bottom of the adjusting tank (1), the water suction pipe is communicated with the water inlet end of the first wastewater lifting pump (9), and the water outlet end of the first wastewater lifting pump (9) is communicated with the sedimentation tank (2) through a pipeline; the water outlet end of the sedimentation tank (2) is communicated with the intermediate water tank (3); the bottom sludge of the sedimentation tank (2) is communicated with the sludge tank (3) through a pipeline or a mud scraper or a mud sucker (10); the bottom of the middle water tank (3) is provided with a pre-filtration pressure pump (11), and the water outlet end of the pre-filtration pressure pump (11) is communicated with the water inlet (30) of the mechanical filter through a pipeline; the water outlet (31) of the mechanical filter is communicated with the clean water tank (7) through a pipeline; a clear water lifting pump (12) is arranged at the bottom of the clear water tank (7);
an overflow port of the sludge tank (5) is communicated with a water inlet end of the adjusting tank (1) through a pipeline; a water suction pipe is arranged at the bottom of the sludge pool (5), the water suction pipe is communicated with the sludge lifting pump (14), and the water outlet end of the sludge lifting pump (14) is communicated with the water inlet end of the plate-and-frame filter press (6) through a pipeline; the water outlet end of the plate-and-frame filter press (6) is communicated with the water collecting tank (35) through a pipeline; and a second wastewater lifting pump (15) is arranged at the bottom of the water collecting tank (35), and the water outlet end of the second wastewater lifting pump (15) is communicated with the adjusting tank (1) through a pipeline.
Preferably, the adjusting tank (1), the sedimentation tank (2), the intermediate water tank (3), the sludge tank (5) and the clean water tank (7) adopt an integrated structure.
Preferably, the device also comprises an acid dosing unit; the acid dosing unit comprises a first pipeline mixer (16A), an acid dosing device (17) and an acid dosing pump (18);
the first pipeline mixer (16A) is arranged on a drainage pipeline from the water outlet end of the first wastewater lifting pump (9) to the sedimentation tank (2); the acid dosing device (17) is connected to the water inlet end of the first pipeline mixer (16A) through the acid dosing pump (18).
Preferably, the device also comprises a flocculating agent dosing unit; the flocculant dosing unit comprises a second pipeline mixer (16B), a flocculant dosing device (19) and a flocculant dosing pump (20);
the second pipeline mixer (16B) is arranged on a water outlet end of the first pipeline mixer (16A) to a water discharge pipeline of the sedimentation tank (2); and the flocculant dosing device (19) is connected to the water inlet end of the second pipeline mixer (16B) through the flocculant dosing pump (20).
Preferably, the device also comprises a unit for performing forward washing and back washing on the filter material in the mechanical filter (4);
a filter material is arranged in the mechanical filter (4); the unit for forward and reverse washing of the mechanical filter (4) comprises: a backwashing water pump (13) of the mechanical filter, an electric valve (25) of a water inlet, an electric valve (26) of a water outlet, an electric valve (27) of a forward washing water outlet, an electric valve (28) of a backwashing water inlet, an electric valve (29) of a backwashing water outlet, a forward washing water outlet (32), a backwashing water inlet (33) and a backwashing water outlet (34);
a forward washing water outlet (32) of the mechanical filter (4) is communicated to a water inlet end of the regulating tank (1) through a forward washing pipeline; a mechanical filter backwashing water pump (13) is arranged at the bottom of the clean water tank (7), and the water outlet end of the mechanical filter backwashing water pump (13) is communicated with a backwashing water inlet (33) of the mechanical filter (4) through a pipeline; a back washing water outlet (34) of the mechanical filter (4) is communicated with a water inlet end of the regulating tank (1) through a back washing pipeline;
wherein the water inlet electric valve (25) is installed in the water inlet pipe of the mechanical filter water inlet (30); the electric valve (26) at the water outlet is arranged in the water outlet pipeline of the water outlet (31) of the mechanical filter; the electric valve (27) for the forward washing water outlet is arranged in a water outlet pipeline of the forward washing water outlet (32) of the mechanical filter (4); the electric valve (28) for the back washing water inlet is arranged in a water inlet pipeline of the back washing water inlet (33) of the mechanical filter (4); the electric valve (29) for the back flush water outlet is arranged in the water outlet pipeline of the back flush water outlet (34) of the mechanical filter (4).
Preferably, the coagulant aid dosing unit is further included; the coagulant aid dosing unit comprises a coagulant aid dosing device (21) and a coagulant aid dosing pump (22);
the coagulant aid dosing device (21) is connected to a water inlet pipe of the sludge lifting pump (14) through the coagulant aid dosing pump (22).
Preferably, the device also comprises a disinfectant dosing unit; the disinfectant dosing unit comprises a third pipeline mixer (16C), a disinfectant dosing device (23) and a disinfectant dosing pump (24);
-mounting said third pipe mixer (16C) in the drain pipe between said mechanical filter outlet (31) to said clean water basin (7); the disinfectant adding device (23) is connected to the water inlet end of the third pipeline mixer (16C) through the disinfectant adding pump (24).
Preferably, the sedimentation tank (2) is a horizontal flow sedimentation tank, a radial flow sedimentation tank, a vertical flow sedimentation tank or an inclined tube sedimentation tank.
The invention also provides a method for the treatment system of the production wastewater of the underground cavern, which comprises the following steps:
step 1, the production wastewater of the underground cavern enters a regulating tank (1) through pressure flow or gravity flow;
step 2, stirring the wastewater in the regulating reservoir (1) through a submersible stirrer (8);
step 3, lifting the uniformly stirred wastewater in the regulating tank (1) by a first wastewater lifting pump (9), flowing into a first pipeline mixer (16A), mixing the wastewater with acid conveyed by an acid dosing pump (18) of an acid dosing device (17), flowing into a second pipeline mixer (16B), mixing the wastewater with a flocculating agent conveyed by a flocculating agent dosing pump (20) of a flocculating agent dosing device (19), and conveying the wastewater to a sedimentation tank (2);
supernatant in the sludge tank (5) flows back to the adjusting tank (1); after sludge in the sludge tank (5) is mixed with coagulant aid delivered by a coagulant aid dosing device (21) through a coagulant aid dosing pump (22), the mixture is lifted to a plate-and-frame filter press (6) through a sludge lifting pump (14) for dehydration; the dewatered mud cake (36) is transported outside, and the filtrate is lifted to the regulating reservoir (1) through a self-flowing or second wastewater lifting pump (15);
step 5, lifting the wastewater in the intermediate water tank (3) to a mechanical filter (4) through a pre-filtration booster pump (11);
step 6, opening an electric valve (25) of a water inlet and an electric valve (26) of a water outlet, closing an electric valve (27) of a forward washing water outlet, an electric valve (28) of a back washing water inlet and an electric valve (29) of a back washing water outlet, enabling wastewater in the mechanical filter (4) to flow in from a water inlet (30) of the mechanical filter, flow out from a water outlet (31) of the mechanical filter, flow into a third pipeline mixer (16C) after being filtered by filter materials from top to bottom, mix with disinfectant flowing in from a disinfectant dosing device (23) through a disinfectant dosing pump (24), and flow into a clean water tank (7) after being disinfected;
and 7, lifting the disinfected clean water in the clean water tank (7) to a recycling point or discharging the disinfected clean water after reaching the standard through a clean water lifting pump (12).
Preferably, the method also comprises the operation of performing forward washing and back washing on the filter material in the mechanical filter (4), and specifically comprises the following steps:
opening an electric water inlet valve (25) and an electric forward washing water outlet valve (27), closing an electric water outlet valve (26), an electric back washing water inlet valve (28) and an electric back washing water outlet valve (29), enabling waste water in the mechanical filter (4) to flow into the mechanical filter from a water inlet (30) of the mechanical filter, enabling washing waste water to flow out of a forward washing water outlet (32) and be discharged to a regulating tank (1) through a pipeline, and performing forward washing on the filter material from top to bottom;
the backwashing water inlet electric valve (28) and the backwashing water outlet electric valve (29) are opened, the water inlet electric valve (25), the water outlet electric valve (26) and the forward washing water outlet electric valve (27) are closed, clean water in the clean water tank (7) is lifted to the backwashing water inlet (33) of the mechanical filter (4) through the backwashing water pump (13) of the mechanical filter, washing wastewater flows out of the backwashing water outlet (34) and is discharged to the regulating tank (1) through a pipeline, and the filter material is backwashed from bottom to top.
The system and the method for treating the production wastewater of the underground cavern have the following advantages that:
the system and the method for treating the production wastewater of the underground cavern can effectively treat the production wastewater of the underground cavern, and have the characteristics of stable system operation, small occupied area and stable and standard effluent quality.
Drawings
FIG. 1 is a block diagram of a system for treating wastewater from underground caverns;
FIG. 2 is a flow chart of a method for treating wastewater produced by an underground cavern provided by the invention.
Wherein:
1-regulating tank, 2-settling tank, 3-intermediate water tank, 4-mechanical filter, 5-sludge tank, 6-plate-and-frame filter press, 7-clean water tank, 8-submersible mixer, 9-first wastewater lift pump, 10-mud scraper or mud sucker, 11-pre-filtration pressurizing pump, 12-clean water lift pump, 13-mechanical filter backwashing water pump, 14-sludge lift pump, 15-second wastewater lift pump, 16A-first pipeline mixer, 16B-second pipeline mixer, 16C-third pipeline mixer, 17-acid dosing device, 18-acid dosing pump, 19-flocculant dosing device, 20-flocculant dosing pump, 21-coagulant aid dosing device, 22-coagulant aid dosing pump, 23-disinfectant dosing device, 24-disinfectant dosing pump, 25-water inlet electrically operated valve, 26-water outlet electrically operated valve, 27-forward washing water outlet, 28-water inlet, 29-water inlet, 30-backwashing mechanical dosing pump, 31-mechanical filter, 32-forward washing filter, 33-forward washing water inlet, 37-sludge water outlet, 37-backwashing water outlet, 37-sludge water collecting tank, and 37-sludge collecting tank.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention aims to solve the technical problem of providing a system and a method for treating the production wastewater of underground caverns, which can effectively treat the production wastewater of the underground caverns and have the characteristics of stable system operation, small occupied area and stable effluent quality reaching the standard. Meanwhile, the technical parameters suitable for producing wastewater in the underground cavern are adopted.
Referring to fig. 1 and 2, the present invention provides an underground cavern production wastewater treatment system, comprising: the system comprises an adjusting tank 1, a sedimentation tank 2, an intermediate water tank 3, a mechanical filter 4, a sludge tank 5, a plate-and-frame filter press 6, a clean water tank 7, a water collecting tank 35, a mechanical filter water inlet 30, a mechanical filter water outlet 31 and auxiliary equipment; wherein the auxiliary equipment comprises a submersible mixer 8, a first wastewater lift pump 9, a mud scraper or suction dredger 10, a pre-filtration pressurizing pump 11, a clear water lift pump 12, a sludge lift pump 14 and a second wastewater lift pump 15;
a submersible mixer 8 is arranged in the adjusting tank 1; the bottom of the adjusting tank 1 is provided with a water suction pipe which is communicated with the water inlet end of the first wastewater lift pump 9, and the water outlet end of the first wastewater lift pump 9 is communicated with the sedimentation tank 2 through a pipeline; the water outlet end of the sedimentation tank 2 is communicated with the middle water tank 3; the sludge at the bottom of the sedimentation tank 2 is communicated with the sludge tank 3 through a pipeline or a sludge scraper or a sludge suction machine 10; the bottom of the middle water tank 3 is provided with a pre-filtration pressure pump 11, and the water outlet end of the pre-filtration pressure pump 11 is communicated with the water inlet 30 of the mechanical filter through a pipeline; the water outlet 31 of the mechanical filter is communicated with the clean water tank 7 through a pipeline; a clear water lifting pump 12 is arranged at the bottom of the clear water tank 7;
an overflow port of the sludge tank 5 is communicated with a water inlet end of the adjusting tank 1 through a pipeline; a water suction pipe is arranged at the bottom of the sludge pool 5 and is communicated with a sludge lift pump 14, and the water outlet end of the sludge lift pump 14 is communicated with the water inlet end of the plate-and-frame filter press 6 through a pipeline; the water outlet end of the plate-and-frame filter press 6 is communicated with the water collecting tank 35 through a pipeline; the bottom of the water collecting tank 35 is provided with a second wastewater lifting pump 15, and the water outlet end of the second wastewater lifting pump 15 is communicated with the adjusting tank 1 through a pipeline.
The underground cavern production wastewater treatment system provided by the invention has the following innovative structural design:
(1) Adjusting tank 1
Equalizing basin 1 has the effect of adjusting quality of water yield, dive mixer 8 has been installed in equalizing basin 1, dive mixer 8 has the waste water that impels the stirring to contain the suspended solid, establish rivers, strengthen the stirring function, prevent sludge sedimentation, the installation is overhauld conveniently, can be under the condition of need not to get rid of sewage in the equalizing basin, can install fast and dismantle dive mixer, and compact structure, small, light in weight, easy operation maintenance, long service life, be fit for underground cavern production waste water and use, 1 dwell time in equalizing basin should take more than 6 hours.
(2) Middle water pool 6
The intermediate water tank 6 is used as a water collecting tank of a pre-filtration pressurizing pump, and the retention time is designed according to 20-29 minutes.
(3) Clean water tank 7
The clean water tank 7 stores clean water and supplies the water to a reuse water point or a discharge point. The residence time was designed to be 2 hours.
(4) Sludge tank 5
The sludge tank 5 stores the sludge discharged from the sedimentation tank 2, the supernatant liquid flows back to the regulating tank 1, and the sludge is lifted to the plate-and-frame filter press 6 by the sludge lifting pump 14 for dehydration. The residence time is designed according to 12 hours of the wet sludge quantity.
(5) In the invention, the adjusting tank 1, the sedimentation tank 2, the intermediate water tank 3, the sludge tank 5 and the clean water tank 7 adopt an integrated structure.
(6) Acid dosing unit
The acid dosing unit comprises a first pipeline mixer 16A, an acid dosing device 17 and an acid dosing pump 18;
a first pipeline mixer 16A is arranged on a drainage pipeline from the water outlet end of the first wastewater lifting pump 9 to the sedimentation tank 2; the acid dosing device 17 is connected to the water inlet end of the first line mixer 16A via an acid dosing pump 18.
(7) Flocculating agent dosing unit
The flocculant dosing unit comprises a second pipeline mixer 16B, a flocculant dosing device 19 and a flocculant dosing pump 20;
a second pipeline mixer 16B is arranged on a water outlet end of the first pipeline mixer 16A to a water discharge pipeline of the sedimentation tank 2; and the flocculant dosing device 19 is connected to the water inlet end of the second pipeline mixer 16B through a flocculant dosing pump 20.
(8) A filter material forward washing and backwashing unit in the mechanical filter 4;
the filtering material is arranged in the mechanical filter 4; the unit for forward and backward washing of the mechanical filter 4 comprises: a backwashing water pump 13 of the mechanical filter, an electric valve 25 of a water inlet, an electric valve 26 of a water outlet, an electric valve 27 of a forward washing water outlet, an electric valve 28 of a backwashing water inlet, an electric valve 29 of a backwashing water outlet, a forward washing water outlet 32, a backwashing water inlet 33 and a backwashing water outlet 34;
the forward washing water outlet 32 of the mechanical filter 4 is communicated to the water inlet end of the regulating tank 1 through a forward washing pipeline; the bottom of the clean water tank 7 is provided with a mechanical filter backwashing water pump 13, and the water outlet end of the mechanical filter backwashing water pump 13 is communicated with a backwashing water inlet 33 of the mechanical filter 4 through a pipeline; the back-washing water outlet 34 of the mechanical filter 4 is communicated with the water inlet end of the regulating tank 1 through a back-washing pipeline;
wherein, a water inlet electric valve 25 is arranged in the water inlet pipeline of the water inlet 30 of the mechanical filter; an electric valve 26 at the water outlet is arranged in a water outlet pipeline of the water outlet 31 of the mechanical filter; a forward washing water outlet electric valve 27 is arranged in a water outlet pipeline of a forward washing water outlet 32 of the mechanical filter 4; a backwashing water inlet electric valve 28 is arranged in a water inlet pipeline of a backwashing water inlet 33 of the mechanical filter 4; a back-washing water outlet electric valve 29 is arranged in a water outlet pipeline of a back-washing water outlet 34 of the mechanical filter 4.
Therefore, in the invention, the filtering material in the mechanical filter 4 has a daily cleaning and maintenance function, the electric valve 25 for the water inlet and the electric valve 27 for the forward washing water outlet are opened, the electric valve 26 for the water outlet, the electric valve 28 for the back washing water inlet and the electric valve 29 for the back washing water outlet are closed, the wastewater in the mechanical filter 4 flows in from the water inlet 30 of the mechanical filter, the washing wastewater flows out from the forward washing water outlet 32 and is discharged to the regulating tank 1 through a pipeline, and the filtering material is subjected to forward washing from top to bottom; and (3) opening the electric valve 28 for the back washing water inlet and the electric valve 29 for the back washing water outlet, closing the electric valve 25 for the water inlet, the electric valve 26 for the water outlet and the electric valve 27 for the forward washing water outlet, lifting the clean water in the clean water tank 7 to the back washing water inlet 33 of the mechanical filter 4 through the back washing water pump 13 of the mechanical filter, discharging the washing wastewater from the back washing water outlet 34 to the regulating tank through a pipeline, and back washing the filter material from bottom to top. The backwashing strength is 15L/(s.m) 2 ) And (5) designing.
(9) Coagulant aid dosing unit
The coagulant aid dosing unit comprises a coagulant aid dosing device 21 and a coagulant aid dosing pump 22;
the coagulant aid dosing device 21 is connected to the water inlet pipe of the sludge lifting pump 14 through a coagulant aid dosing pump 22.
(10) Disinfectant dosing unit
The disinfectant dosing unit comprises a third pipeline mixer 16C, a disinfectant dosing device 23 and a disinfectant dosing pump 24;
in the drain pipe between the outlet 31 of the mechanical filter and the clean water tank 7, a third pipe mixer 16C is installed; the disinfectant adding device 23 is connected to the water inlet end of the third line mixer 16C through a disinfectant adding pump 24.
(11) Sedimentation tank 2
In the invention, the sedimentation tank 2 is a horizontal flow sedimentation tank, a radial flow sedimentation tank, a vertical flow sedimentation tank or an inclined tube sedimentation tank. The surface load of the sedimentation tank is 1.0-2.0m 3 /(m 3 H) design, residence time designed according to 1.0-2.0h。
The invention also provides a method for the underground cavern production wastewater treatment system, which comprises the following steps:
step 1, the production wastewater of the underground cavern enters a regulating tank 1 through pressure flow or gravity flow;
step 2, stirring the wastewater in the regulating reservoir 1 by a submersible stirrer 8;
step 3, lifting the uniformly stirred wastewater in the adjusting tank 1 by a first wastewater lifting pump 9, flowing into a first pipeline mixer 16A, mixing the wastewater with acid delivered by an acid dosing device 17 through an acid dosing pump 18, flowing into a second pipeline mixer 16B, mixing the wastewater with a flocculant delivered by a flocculant dosing device 19 through a flocculant dosing pump 20, and delivering the mixture to a sedimentation tank 2;
supernatant in the sludge tank 5 flows back to the adjusting tank 1; mixing sludge in the sludge pool 5 with a coagulant aid fed by a coagulant aid feeding device 21 through a coagulant aid feeding pump 22, lifting the mixture to a plate-and-frame filter press 6 through a sludge lifting pump 14 for dehydration, transporting a dehydrated sludge cake 36 outwards, and lifting filtrate to an adjusting pool 1 through a self-flowing or second wastewater lifting pump 15;
step 5, lifting the wastewater in the intermediate water tank 3 to a mechanical filter 4 by a pressure pump 11 before filtration;
step 6, opening the electric valve 25 for the water inlet and the electric valve 26 for the water outlet, closing the electric valve 27 for the forward washing water outlet, the electric valve 28 for the back washing water inlet and the electric valve 29 for the back washing water outlet, enabling the wastewater in the mechanical filter 4 to flow into the water inlet 30 of the mechanical filter, flow out of the water outlet 31 of the mechanical filter, flow into the third pipeline mixer 16C after being filtered by filter materials from top to bottom, be mixed with the disinfectant flowing in from the disinfectant dosing device 23 through the disinfectant dosing pump 24, and flow into the clean water tank 7 after being disinfected;
and 7, lifting the sterilized clean water in the clean water tank 7 to a recycling point or discharging the clean water after reaching the standard through a clean water lifting pump 12.
The method also comprises the operation of performing forward washing and back washing on the filter material in the mechanical filter 4, which specifically comprises the following steps:
opening the electric valve 25 at the water inlet and the electric valve 27 at the forward washing water outlet, closing the electric valve 26 at the water outlet, the electric valve 28 at the back washing water inlet and the electric valve 29 at the back washing water outlet, leading the wastewater in the mechanical filter 4 to flow in from the water inlet 30 of the mechanical filter, leading the washing wastewater to flow out from the forward washing water outlet 32 and discharge to the regulating tank 1 through a pipeline, and performing forward washing on the filter material from top to bottom; and (3) opening the electric valve 28 for the back washing water inlet and the electric valve 29 for the back washing water outlet, closing the electric valve 25 for the water inlet, the electric valve 26 for the water outlet and the electric valve 27 for the forward washing water outlet, lifting the clean water in the clean water tank 7 to the back washing water inlet 33 of the mechanical filter 4 through the back washing water pump 13 of the mechanical filter, discharging the washing wastewater from the back washing water outlet 34 to the regulating tank 1 through a pipeline, and back washing the filter material from bottom to top.
The invention has the beneficial effects that: can effectively treat the production wastewater of the underground cavern, and has the characteristics of stable system operation, small occupied area and stable and standard effluent quality.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (10)
1. An underground cavern waste water treatment system, its characterized in that includes: the device comprises an adjusting tank (1), a sedimentation tank (2), an intermediate water tank (3), a mechanical filter (4), a sludge tank (5), a plate-and-frame filter press (6), a clean water tank (7), a water collecting tank (35), a mechanical filter water inlet (30), a mechanical filter water outlet (31) and auxiliary equipment; wherein the auxiliary equipment comprises a submersible mixer (8), a first wastewater lifting pump (9), a mud scraper or suction dredge (10), a pre-filtration pressure pump (11), a clear water lifting pump (12), a sludge lifting pump (14) and a second wastewater lifting pump (15);
a submersible stirrer (8) is arranged in the adjusting tank (1); a water suction pipe is arranged at the bottom of the adjusting tank (1), the water suction pipe is communicated with the water inlet end of the first wastewater lifting pump (9), and the water outlet end of the first wastewater lifting pump (9) is communicated with the sedimentation tank (2) through a pipeline; the water outlet end of the sedimentation tank (2) is communicated with the intermediate water tank (3); the bottom sludge of the sedimentation tank (2) is communicated with the sludge tank (3) through a pipeline or a mud scraper or a mud sucker (10); the bottom of the middle water tank (3) is provided with a pre-filtration pressure pump (11), and the water outlet end of the pre-filtration pressure pump (11) is communicated with the water inlet (30) of the mechanical filter through a pipeline; the water outlet (31) of the mechanical filter is communicated with the clean water tank (7) through a pipeline; a clear water lifting pump (12) is arranged at the bottom of the clear water tank (7);
an overflow port of the sludge tank (5) is communicated with a water inlet end of the adjusting tank (1) through a pipeline; a water suction pipe is arranged at the bottom of the sludge pool (5), the water suction pipe is communicated with the sludge lifting pump (14), and the water outlet end of the sludge lifting pump (14) is communicated with the water inlet end of the plate-and-frame filter press (6) through a pipeline; the water outlet end of the plate-and-frame filter press (6) is communicated with the water collecting tank (35) through a pipeline; and a second wastewater lifting pump (15) is arranged at the bottom of the water collecting tank (35), and the water outlet end of the second wastewater lifting pump (15) is communicated with the adjusting tank (1) through a pipeline.
2. An underground cavern production wastewater treatment system as claimed in claim 1, wherein the adjusting tank (1), the sedimentation tank (2), the intermediate water tank (3), the sludge tank (5) and the clean water tank (7) are of an integrated structure.
3. The underground cavern production wastewater treatment system as claimed in claim 1, further comprising an acid dosing unit; the acid dosing unit comprises a first pipeline mixer (16A), an acid dosing device (17) and an acid dosing pump (18);
the first pipeline mixer (16A) is arranged on a water outlet end of the first wastewater lifting pump (9) to a water drainage pipeline of the sedimentation tank (2); the acid dosing device (17) is connected to the water inlet end of the first pipeline mixer (16A) through the acid dosing pump (18).
4. The underground cavern production wastewater treatment system of claim 1, further comprising a flocculant dosing unit; the flocculant dosing unit comprises a second pipeline mixer (16B), a flocculant dosing device (19) and a flocculant dosing pump (20);
the second pipeline mixer (16B) is arranged on a water outlet end of the first pipeline mixer (16A) to a water discharge pipeline of the sedimentation tank (2); and the flocculant dosing device (19) is connected to the water inlet end of the second pipeline mixer (16B) through the flocculant dosing pump (20).
5. An underground cavern production wastewater treatment system as claimed in claim 1, further comprising a unit for performing forward washing and back washing on filter materials in the mechanical filter (4);
a filter material is arranged in the mechanical filter (4); the unit for forward and reverse washing of the mechanical filter (4) comprises: a backwashing water pump (13) of the mechanical filter, an electric valve (25) of a water inlet, an electric valve (26) of a water outlet, an electric valve (27) of a forward washing water outlet, an electric valve (28) of a backwashing water inlet, an electric valve (29) of a backwashing water outlet, a forward washing water outlet (32), a backwashing water inlet (33) and a backwashing water outlet (34);
a forward washing water outlet (32) of the mechanical filter (4) is communicated to a water inlet end of the regulating tank (1) through a forward washing pipeline; a mechanical filter backwashing water pump (13) is arranged at the bottom of the clean water tank (7), and the water outlet end of the mechanical filter backwashing water pump (13) is communicated to a backwashing water inlet (33) of the mechanical filter (4) through a pipeline; a backwashing water outlet (34) of the mechanical filter (4) is communicated with a water inlet end of the regulating tank (1) through a backwashing pipeline;
wherein the water inlet electric valve (25) is installed in the water inlet pipe of the mechanical filter water inlet (30); the electric valve (26) at the water outlet is arranged in the water outlet pipeline of the water outlet (31) of the mechanical filter; the electric valve (27) for the forward washing water outlet is arranged in a water outlet pipeline of the forward washing water outlet (32) of the mechanical filter (4); the electric valve (28) for the back flush water inlet is arranged in a water inlet pipeline of the back flush water inlet (33) of the mechanical filter (4); the electric valve (29) for the back flush water outlet is arranged in the water outlet pipeline of the back flush water outlet (34) of the mechanical filter (4).
6. The underground cavern production wastewater treatment system as claimed in claim 1, further comprising a coagulant aid dosing unit; the coagulant aid dosing unit comprises a coagulant aid dosing device (21) and a coagulant aid dosing pump (22);
the coagulant aid dosing device (21) is connected to a water inlet pipe of the sludge lifting pump (14) through the coagulant aid dosing pump (22).
7. The underground cavern production wastewater treatment system of claim 1, further comprising a disinfectant dosing unit; the disinfectant dosing unit comprises a third pipeline mixer (16C), a disinfectant dosing device (23) and a disinfectant dosing pump (24);
-mounting said third pipe mixer (16C) in the drain pipe between said mechanical filter outlet (31) to said clean water basin (7); the disinfectant adding device (23) is connected to the water inlet end of the third pipeline mixer (16C) through the disinfectant adding pump (24).
8. A subterranean cavern production wastewater treatment system as claimed in claim 1, wherein the sedimentation tank (2) is a horizontal sedimentation tank, a radial sedimentation tank, a vertical sedimentation tank or a tube settler.
9. A method for the treatment of wastewater from underground cavern production as recited in any of claims 1 to 8, comprising the steps of:
step 1, the production wastewater of the underground cavern enters a regulating tank (1) through pressure flow or gravity flow;
step 2, stirring the wastewater in the regulating reservoir (1) through a submersible stirrer (8);
step 3, lifting the uniformly stirred wastewater in the regulating tank (1) by a first wastewater lifting pump (9), flowing into a first pipeline mixer (16A), mixing the wastewater with acid conveyed by an acid dosing pump (18) of an acid dosing device (17), flowing into a second pipeline mixer (16B), mixing the wastewater with a flocculating agent conveyed by a flocculating agent dosing pump (20) of a flocculating agent dosing device (19), and conveying the wastewater to a sedimentation tank (2);
step 4, overflowing the supernatant in the sedimentation tank (2) to the intermediate water tank (3) through a water collecting tank (37); the sludge in the sedimentation tank (2) is conveyed to a sludge tank (5) through a self-flowing or mud scraper or a mud suction machine (10);
supernatant in the sludge tank (5) flows back to the adjusting tank (1); after sludge in the sludge tank (5) is mixed with coagulant aid delivered by a coagulant aid dosing device (21) through a coagulant aid dosing pump (22), the mixture is lifted to a plate-and-frame filter press (6) through a sludge lifting pump (14) for dehydration; the dewatered mud cake (36) is transported outside, and the filtrate is lifted to the regulating reservoir (1) through a self-flowing or second wastewater lifting pump (15);
step 5, lifting the wastewater in the intermediate water tank (3) to a mechanical filter (4) through a pre-filtration booster pump (11);
step 6, opening an electric valve (25) of a water inlet and an electric valve (26) of a water outlet, closing an electric valve (27) of a forward washing water outlet, an electric valve (28) of a back washing water inlet and an electric valve (29) of a back washing water outlet, enabling wastewater in the mechanical filter (4) to flow in from a water inlet (30) of the mechanical filter, flow out from a water outlet (31) of the mechanical filter, flow into a third pipeline mixer (16C) after being filtered by filter materials from top to bottom, mix with disinfectant flowing in from a disinfectant dosing device (23) through a disinfectant dosing pump (24), and flow into a clean water tank (7) after being disinfected;
and 7, lifting the disinfected clean water in the clean water tank (7) to a recycling point or discharging the disinfected clean water after reaching the standard through a clean water lifting pump (12).
10. A method for an underground cavern production wastewater treatment system as claimed in claim 9, further comprising the operation of forward washing and back washing the filter material in the mechanical filter (4), in particular:
opening an electric water inlet valve (25) and an electric forward washing water outlet valve (27), closing an electric water outlet valve (26), an electric back washing water inlet valve (28) and an electric back washing water outlet valve (29), enabling waste water in the mechanical filter (4) to flow into the mechanical filter from a water inlet (30) of the mechanical filter, enabling washing waste water to flow out of a forward washing water outlet (32) and be discharged to a regulating tank (1) through a pipeline, and performing forward washing on the filter material from top to bottom;
the backwashing water inlet electric valve (28) and the backwashing water outlet electric valve (29) are opened, the water inlet electric valve (25), the water outlet electric valve (26) and the forward washing water outlet electric valve (27) are closed, clean water in the clean water tank (7) is lifted to the backwashing water inlet (33) of the mechanical filter (4) through the backwashing water pump (13) of the mechanical filter, washing wastewater flows out of the backwashing water outlet (34) and is discharged to the regulating tank (1) through a pipeline, and the filter material is backwashed from bottom to top.
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| CN202310020665.8A CN115818901A (en) | 2023-01-06 | 2023-01-06 | Underground cavern production wastewater treatment system and method |
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