CN212403912U - Effluent treatment system of water works - Google Patents
Effluent treatment system of water works Download PDFInfo
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- CN212403912U CN212403912U CN202020963907.9U CN202020963907U CN212403912U CN 212403912 U CN212403912 U CN 212403912U CN 202020963907 U CN202020963907 U CN 202020963907U CN 212403912 U CN212403912 U CN 212403912U
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Abstract
The utility model relates to a waste water treatment technical field provides a water works effluent disposal system, include: the production wastewater optimized discharge unit is used for precipitating sludge discharge water and filtering backwashing water; the sludge water discharging adjusting unit is communicated with the production wastewater optimized discharging unit; the sludge water concentration unit is communicated with the sludge water adjusting unit; the sludge dewatering unit is communicated with the sludge water concentration unit; the drying unit is communicated with the sludge dewatering unit; and the recovery unit is communicated with the production wastewater optimized discharge unit, the sludge water discharge regulating unit and the sludge water discharge concentrating unit. The utility model effectively combines the waterline process and the mud line process, reduces the volume of the structure of the mud drainage system, has small occupied area and less investment, and is suitable for the reconstruction of the mud drainage facility of the old waterworks; the utility model discloses can carry out the retrieval and utilization to back flush water and supernatant, practice thrift the water resource to improve the solid rate that contains of muddy water, improve sludge treatment efficiency under the condition that does not influence quality of water.
Description
Technical Field
The utility model relates to a waste water treatment technical field especially relates to a water works effluent disposal system.
Background
The tap water plant produces a large amount of domestic and production water, and simultaneously produces a large amount of sludge, the sludge mainly comes from sludge discharge of a sedimentation tank and backwashing wastewater of a filter tank, and the water amount is about 4-7% of the total purified water amount of the tap water plant. At present, the water supply plants in China almost all directly discharge sludge to nearby water bodies such as rivers, lakes and the like, and serious pollution is caused to the water bodies. Along with the implementation of policies of saving water resources and accelerating recycling, the sludge discharge of the reaction sedimentation tank and the backflushing wastewater of the filter tank in the production of the water works are comprehensively and effectively recycled. However, the wastewater treatment process in the prior art not only needs to occupy a large amount of land resources, but also has low solid content of discharged muddy water, thereby causing low sludge treatment efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model provides a water works effluent disposal system to the problem that exists among the prior art for waste water treatment process needs to occupy a large amount of land resources among the solution prior art, and the technical problem that the solid rate of containing of mud water leads to sludge treatment inefficiency is low.
The utility model discloses technical scheme as to above-mentioned technical problem and propose as follows:
a waterworks wastewater treatment system comprising:
the production wastewater optimized discharge unit is used for precipitating sludge discharge water and filtering backwashing water;
the sludge water adjusting unit is communicated with the production wastewater optimized discharging unit and is used for collecting the sludge water and pre-concentrating the sludge water;
the sludge water concentration unit is communicated with the sludge water adjusting unit and is used for carrying out sludge-water separation and concentration treatment on the sludge water subjected to preconcentration;
the sludge dewatering unit is communicated with the sludge discharge water concentration unit and is used for dewatering the separated sludge to form a sludge cake;
the drying unit is communicated with the sludge dewatering unit and is used for deeply dewatering the sludge cake formed after dewatering treatment;
the recovery unit, with the production wastewater optimizes the discharge unit arrange the muddy water regulating unit arrange the muddy water unit that the muddy water concentration unit all communicates, is used for retrieving the production wastewater optimizes the backwash water of discharge unit, retrieves arrange the supernatant that muddy water regulating unit preconcentrated the gained, retrieve arrange the supernatant of muddy water unit that concentrates and be used for with the sediment bed mud in the backwash water arrange the muddy water regulating unit extremely.
According to the above-mentioned tap water plant wastewater treatment system, the production wastewater optimal discharge unit includes a precipitation unit for precipitating sludge water and a filtration unit for filtering backwash water;
the external raw water is communicated with the sedimentation unit, the sedimentation unit is communicated with the sludge water discharge regulating unit, the sedimentation unit is communicated with the filtering unit, and the filtering unit is communicated with the recovery unit;
the sludge discharge period of the precipitation unit and the back flush period of the filtering unit are arranged in a staggered mode so as to realize wastewater discharge in a staggered mode.
According to the above wastewater treatment system of the water works, the precipitation unit comprises a plurality of sludge discharge areas, each sludge discharge area is provided with a sludge discharge valve, each sludge discharge valve can be independently controlled through an electromagnetic valve, the electromagnetic valve is connected with a central control system through a programmable controller, and the central control system realizes independent sludge discharge in different sludge discharge areas by setting sludge discharge parameters of the different sludge discharge areas.
According to foretell water works effluent disposal system, sediment unit includes that anterior segment mud discharging is regional, middle section mud discharging is regional and the back end mud discharging is regional, through carrying out sample detection to the suspended solid of the mud discharging water in each mud discharging section region to its concentration of analysis, and then confirm the mud discharging duration and the mud discharging cycle, and the mud discharging parameter that passes through the central control system setting according to the operation needs realizes automatic subregion mud discharging.
According to the wastewater treatment system of the waterworks, the bottom of the sludge water adjusting unit is provided with the first sludge scraper for scraping bottom sludge to the sludge bucket, the upper part of the sludge water adjusting unit is provided with the floating device, and the floating device is used for drawing out supernatant liquid to be discharged or recycled to the recovery unit so as to achieve the effect of preconcentration of sludge water;
or the bottom of the sludge discharge water adjusting unit is provided with a second sludge scraper for scraping bottom sludge to a sludge hopper, the upper part of the sludge discharge water adjusting unit is provided with a decanter, and supernatant can be reused after the sludge discharge water and the sediment sludge in the backwash water enter the sludge discharge water adjusting unit and are statically precipitated for a preset time, so that the sludge discharge water preconcentration effect is achieved.
According to the above-mentioned tap water plant wastewater treatment system, the sludge water concentration unit comprises a gravity concentration tank;
an inclined plate used for increasing the sedimentation area is filled in the gravity concentration tank, and the inclined plate is supported and fixed through a first supporting beam;
or the gravity concentration tank is internally filled with an inclined pipe used for increasing the sedimentation area, and the inclined pipe is supported and fixed through a second supporting beam.
According to the tap water plant wastewater treatment system, the sludge water discharge concentration unit comprises a sludge lifting pump, an automatic control part, a polyacrylamide feeding system, a supernatant turbidity detector and a sludge inlet and outlet solid content detector;
the sludge lifting pump, the polyacrylamide feeding system, the supernatant turbidity detector and the sludge inlet and outlet solid content detector are all connected with the automatic control part, and the automatic control part is connected with the hollow system.
According to the wastewater treatment system of the water plant, the wastewater treatment system of the water plant further comprises a sludge storage tank unit, the sludge discharge water concentration unit is communicated with the sludge storage tank unit and is used for storing the sludge separated from the sludge discharge water concentration unit, the sludge storage tank unit is communicated with the sludge dehydration unit, the sludge stored in the sludge storage tank unit is discharged into the sludge dehydration unit for dehydration treatment to form a sludge cake, and the sludge cake with the unqualified solid content returns to the sludge storage tank unit after the dehydration treatment;
the tap water plant wastewater treatment system further comprises a dehydrated sludge temporary storage unit, the sludge dehydrated unit is connected with the dehydrated sludge temporary storage unit, the sludge cake with the solid content up to the standard after the dehydrated treatment is temporarily stored in the dehydrated sludge temporary storage unit, and the dehydrated sludge temporary storage unit is connected with the drying unit.
According to the above-mentioned wastewater treatment system of a waterworks, the dewatering equipment in the sludge dewatering unit is a stack screw dewatering machine or a centrifugal dewatering machine or a plate and frame dewatering machine or a belt filter press for dewatering.
According to the tap water plant wastewater treatment system, the drying unit deeply dehydrates the sludge through the low-temperature heat drying equipment.
According to above-mentioned scheme the utility model discloses, its beneficial effect lies in at least:
(1) the utility model discloses effectively combine waterline technology and mud line technology, simple process satisfies system water quality requirement while minimize sludge drainage system structures volume, and area is little, and the small investment is applicable to old waterworks sludge drainage facility transformation.
(2) The utility model discloses effectively combine waterline technology and mud line technology, can carry out the retrieval and utilization to back flush water and supernatant, practiced thrift the water resource, will carry out the retrieval and utilization to back flush water and supernatant and can improve the solid rate that contains of muddy water, improved sludge treatment efficiency under the condition that does not influence quality of water.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram I of a wastewater treatment system of a waterworks according to an embodiment of the present invention;
FIG. 2 is a block diagram II of the wastewater treatment system of the waterworks according to the embodiment of the present invention;
fig. 3 is a schematic sectional view of a precipitation unit provided in an embodiment of the present invention;
fig. 4 is a schematic structural view of a sloping plate arranged in a sludge water concentrating unit provided by the embodiment of the present invention;
FIG. 5 is a block diagram of a wastewater treatment system of a waterworks according to an embodiment of the present invention;
FIG. 6 is a flow chart of the wastewater treatment method of the waterworks according to this embodiment;
fig. 7 is a flow chart illustrating a mud feeding signal determination of the mud discharging water concentration unit according to this embodiment.
Wherein, in the figures, the respective reference numerals:
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
Referring to fig. 1, the present embodiment provides a wastewater treatment system for a waterworks, comprising: the optimized discharge unit 10 of the production wastewater is used for precipitating and discharging the muddy water and filtering back washing water; the sludge water adjusting unit 20 is communicated with the production wastewater optimized discharging unit 10 and is used for collecting sludge water and pre-concentrating the sludge water; the sludge water concentration unit 30 is communicated with the sludge water adjusting unit 20 and is used for carrying out sludge-water separation and concentration treatment on the pre-concentrated sludge water; the sludge dewatering unit 40 is communicated with the sludge water concentration unit 30 and is used for dewatering the separated sludge to form a sludge cake; the drying unit 50 is communicated with the sludge dewatering unit 40 and is used for deeply dewatering the sludge cake formed after dewatering treatment; the recovery unit 60 is communicated with the production wastewater optimized discharge unit 10, the sludge discharge regulating unit 20 and the sludge discharge concentrating unit 30, and is used for recovering backwash water of the production wastewater optimized discharge unit 10, recovering supernatant obtained by pre-concentrating the sludge discharge regulating unit 20, recovering supernatant of the sludge discharge concentrating unit 30 and discharging sediment bottom sludge in the backwash water to the sludge discharge regulating unit 20.
The working principle of the wastewater treatment system of the water plant provided by the embodiment can be as follows:
in the wastewater treatment system of the water plant provided by the embodiment, after raw water enters the production wastewater optimized discharge unit 10, the production wastewater optimized discharge unit 10 precipitates and filters backwash water for the raw water, and the filtered backwash water is recycled to the recovery unit 60, so that water resources can be saved, and the hydraulic load of a subsequent sludge water treatment system can be reduced; the precipitated mud water is discharged into a mud water adjusting unit 20, the precipitated bottom mud of the backwashing water in the recovery unit 60 can also be discharged into the mud water adjusting unit 20, the mud water adjusting unit 20 pre-concentrates the precipitated bottom mud of the mud water and the backwashing water, and the supernatant obtained after pre-concentration is recovered to the recovery unit 60, so that stable mud water with high solid content is provided for a subsequent processing mud water treatment system; the sludge water after pre-concentration is discharged into a sludge water concentration unit 30, the sludge water concentration unit 30 performs sludge-water separation and concentration treatment on the sludge water after pre-concentration, supernatant liquid after the treatment of the sludge water concentration unit 30 is recovered to a recovery unit 60, the sludge after concentration treatment is discharged into a sludge dewatering unit 40, the sludge dewatering unit 40 performs dewatering treatment on the separated sludge to form a sludge cake, and the sludge cake after dewatering treatment is transferred to a drying unit 50 for deep dewatering treatment.
The beneficial effect of the effluent disposal system of water works that this embodiment provided lies in at least:
(1) the embodiment effectively combines the waterline process and the mud line process, has simple process, meets the water quality requirement of water production, simultaneously reduces the volume of the structures of the mud drainage system as much as possible, has small occupied area and less investment, and is suitable for the reconstruction of the mud drainage facility of the old waterworks.
(2) The embodiment effectively combines the waterline process and the mud line process, can recycle the backwash water and the supernatant, saves water resources, can improve the solid content of sludge water by recycling the backwash water and the supernatant, and improves the sludge treatment efficiency under the condition of not influencing water quality.
Specifically, referring to fig. 2, the production wastewater optimized discharge unit 10 includes a precipitation unit 11 for precipitating sludge water and a filtering unit 12 for filtering backwash water; the external raw water is communicated with the precipitation unit 11, the precipitation unit 11 is communicated with the sludge water discharge regulating unit 20, the precipitation unit 11 is communicated with the filtering unit 12, the filtering unit 12 is communicated with the recovery unit 60, and after the backwashing water is recovered, the hydraulic load of a subsequent sludge water treatment system can be reduced.
Optionally, the sludge discharge period of the precipitation unit 11 and the back flush period of the filtration unit 12 are set in a staggered peak mode, so that wastewater is discharged in a staggered peak mode, time-sharing collection is achieved, back flush water is recycled independently, and the volume of a sludge discharge water treatment facility is reduced.
Specifically, sediment unit 11 includes a plurality of row mud regions, and every row mud region is equipped with the mud valve, and every mud valve accessible solenoid valve carries out the independent control, and the solenoid valve passes through programmable controller and is connected with central control system, and central control system is through setting up the row mud parameter in different row mud regions to realize the independent row mud of subregion of sediment unit 11. Optionally, the sludge discharge parameters include opening and closing time, sludge discharge period and sludge discharge duration of corresponding electromagnetic valves in different sludge discharge areas, so that automatic partition independent sludge discharge is realized. Optionally, the mud valve is a hydraulic mud valve, and the flow of pressure water is controlled by opening and closing the battery valve, so as to control the opening and closing of the mud valve.
Specifically, referring to fig. 3, the settling unit 11 includes a front-stage sludge discharge area 111, a middle-stage sludge discharge area 112, and a rear-stage sludge discharge area 113, and samples and detects suspended substances of sludge discharge water in each sludge discharge area to analyze the concentration of the suspended substances, so as to determine the duration and period of sludge discharge, and realize automatic partition sludge discharge and improve the solid content of the sludge discharge water according to the sludge discharge parameters set by the central control system according to the operation requirements. In one embodiment, the sediment unit is partitioned to avoid low solid content of the sludge water caused by excessive sludge discharge, and the suspended substances of the sludge water in each area are sampled and detected every 5s for one minute continuously to analyze the concentration of the suspended substances; the highest value of suspended matters in the whole sludge discharge period of the front-section sludge discharge area 111 is 321mg/L, and the average value is 77.2mg/L, which shows that the sludge amount of the front-section sludge discharge area 111 is very small; the suspended matter value of the middle section sludge discharge area 112 in 10s is lower than 50mg/L, the discharge concentration between 10s and 30s is high, the highest concentration is 1774mg/L when 15s is reached, the suspended matter is reduced to below 70mg/L after 35s, and the average value is 480.6 mg/L; the 10s before the sludge is discharged from the rear-section sludge discharge area 113 is basically lower than 50mg/L, the discharge concentration between 10 and 35s is higher, the maximum concentration is 2830mg/L when the discharge concentration is reached at 20s, suspended matters are reduced to be below 30mg/L after 35s, and the average value is 645.2 mg/L; the solid content of the discharged muddy water after mixing in the front section mud discharging area 111, the middle section mud discharging area 112 and the rear section mud discharging area 113 is only 0.040%. Based on the detection results, when the discharge solid content of the sludge discharge is high, the optimal discharge duration of the front-stage sludge discharge region 111, the middle-stage sludge discharge region 112 and the rear-stage sludge discharge region 113 is respectively 25s, 20s and 35 s. The sludge discharge period is respectively adjusted to 24h in the front-section sludge discharge area 111, 12h in the middle-section sludge discharge area 112 and 12h in the rear-section sludge discharge area 113.
It should be understood that, due to the difference of the water distribution system of the sedimentation unit 11, a part of the sedimentation unit 11 may have a large amount of front-end sludge accumulation and a small amount of rear-end sludge accumulation, and when the partition is set, the setting is performed according to specific situations, and the setting is not limited to the front-stage sludge discharge area 111, the middle-stage sludge discharge area 112, and the rear-stage sludge discharge area 113, and may also be other partitions, which are not limited herein.
In one embodiment, the bottom of the sludge water adjusting unit 20 is provided with a first mud scraper for scraping the bottom mud to a mud bucket, and the first mud scraper is arranged to facilitate lifting of the suction pump to the sludge water concentration tank; the upper part of the sludge water adjusting unit 20 is provided with a floating device which is used for pumping out the supernatant to be discharged or recycled to the recovery unit 60 so as to achieve the effect of sludge water preconcentration, and after the sludge water adjusting unit 20 preconcentrates the sludge water, the solid content of the sludge water can be doubled, thereby greatly saving the volume of the sludge water adjusting unit 20 and the subsequent treatment process.
In another embodiment, the bottom of the sludge water adjusting unit 20 is provided with a second mud scraper for scraping the bottom mud to a mud bucket, and the second mud scraper is arranged to facilitate lifting of the suction pump to the sludge water concentration tank; the upper part of the sludge water adjusting unit 20 is provided with a decanter, and after the sludge water and the sediment in the backwash water enter the sludge water adjusting unit 20, supernatant can be recycled after static sedimentation for a preset time, so as to achieve the effect of pre-concentrating the sludge water. Optionally, the supernatant can be recycled after the sludge water is generally settled for 30min, so that the sludge water preconcentration effect is achieved, the solid content of the sludge water can be doubled after the sludge water is preconcentrated by the sludge water adjusting unit 20, and the volumes of the sludge water adjusting unit 20 and a subsequent treatment process are greatly saved.
Optionally, in the algae-laden period, a pre-oxidant (sodium hypochlorite or potassium permanganate and the like) is added into the sludge water regulating unit 20 before sludge feeding to inhibit algae breeding in the sludge water regulating unit 20, and simultaneously sludge fermentation floating is avoided. And before the supernatant is recovered, adding a pre-oxidant before the recovery.
Alternatively, the volume of the sludge water adjusting unit 20 satisfies the volume of the sediment of the highest daily sludge water and the backwashing water, and is constructed in two divisions to be mutually reserved for the overhaul period.
Specifically, referring to fig. 4, the sludge water concentrating unit 30 includes a gravity concentrating tank; in one embodiment, the gravity concentration tank is filled with an inclined plate 31 for increasing a settling area, and the inclined plate 31 is supported and fixed by a first support beam 32.
In another embodiment, the gravity concentration tank is filled with an inclined pipe for increasing the sedimentation area, and the inclined pipe is supported and fixed by a support beam.
Specifically, the sludge water concentration unit 30 includes a sludge lift pump, an automatic control part, a polyacrylamide feeding system, a supernatant turbidity detector, and a sludge inlet and outlet solid content detector; the sludge lifting pump, the polyacrylamide feeding system, the supernatant turbidity detector and the sludge inlet and outlet solid content detector are all connected with the automatic control part, and the automatic control part is connected with the hollow system. The supernatant of the sludge water concentration unit 30 is recycled to the recovery unit 60, food-grade anionic polyacrylamide needs to be added into the polyacrylamide feeding system through the automatic control part for tempering, and optionally, the adding rate of the polyacrylamide is 0.8 per mill (0.8 kilogram of polyacrylamide is added into each ton of sludge), so that the sludge can be concentrated from 99.0-99.5% to 97-98%. The automatic control part controls the supernatant turbidity detector to detect turbidity signals of the supernatant concentrated by the muddy water concentrating unit 30, and the turbidity signals are used for assisting the settling time to control automatic mud feeding. The automatic control part controls the mud inlet and outlet solid content detector to detect the solid content of the mud flowing in and out of the mud water concentration unit 30, so that the solid content of the mud can be known at any time, and the automatic control system controls the mud lift pump to enter a pump starting state or a pump stopping state.
Specifically, referring to fig. 5, the wastewater treatment system of the waterworks further includes a sludge storage tank unit 70, the sludge discharge concentration unit 30 is communicated with the sludge storage tank unit 70 and is used for storing the sludge separated from the sludge discharge concentration unit 30, the sludge storage tank unit 70 is communicated with the sludge dewatering unit 40, the sludge stored in the sludge storage tank unit 70 is discharged into the sludge dewatering unit 40 for dewatering treatment to form a sludge cake, and the sludge cake with the lower solid content rate than the standard after the dewatering treatment flows back to the sludge storage tank unit 70; the waterworks wastewater treatment system further comprises a dehydrated sludge temporary storage unit 80, the sludge dehydration unit 40 is connected with the dehydrated sludge temporary storage unit 80, the sludge cake with the solid content up to the standard after dehydration is temporarily stored in the dehydrated sludge temporary storage unit 80, and the dehydrated sludge temporary storage unit 80 is connected with the drying unit 50. The solid content of the dewatered mud cake is not up to standard when the dewatering equipment in the sludge dewatering unit 40 is started for about one hour before the dewatering equipment is started, the part of the sludge flows back to the sludge storage tank unit 70 through a bypass, and the solid content of the dewatered mud cake is up to standard after the dewatering equipment is stably operated, and the part of the sludge enters the temporary dewatered sludge storage unit 80 for temporary storage.
Optionally, the dewatering equipment in the sludge dewatering unit 40 is a stacked screw dewatering machine, a centrifugal dewatering machine, a plate and frame type dewatering machine or a belt filter press for dewatering, sludge entering the sludge dewatering unit 40 is dewatered by the stacked screw dewatering machine, the centrifugal dewatering machine, the plate and frame type dewatering machine or the belt filter press to form a sludge cake, and the water content of the sludge cake reaches 70-80%. Optionally, polyacrylamide is added for tempering in the sludge dewatering stage.
Preferably, the drying unit 50 deeply dehydrates the sludge to 10% -60% by using a low-temperature heat drying device.
Referring to fig. 6, the present embodiment further provides a method for treating wastewater from a waterworks, comprising:
step S100: controlling the production wastewater optimized discharge unit 10 to precipitate sludge discharge water and filter backwash water, and recovering the filtered backwash water to the recovery unit 60;
step S200: independently controlling the opening and closing of each group of mud valves, the mud discharging period and the duration of mud discharging in the production wastewater optimized discharge unit 10 according to the operation effect of the production wastewater optimized discharge unit 10 and the mud accumulation condition of each region, and discharging the mud discharging water to a mud discharging water regulating unit 20;
step S300: controlling a sludge water adjusting unit 20 to collect sludge water, collecting bottom sludge through a sludge scraper at the bottom of the sludge water adjusting unit 20 to realize sludge water preconcentration, and recovering a supernatant of the sludge water adjusting unit 20 to a recovery unit 60;
step S400: controlling the sludge water concentrating unit 30 to perform sludge-water separation and concentration treatment on the pre-concentrated sludge water, storing the concentrated sludge in the sludge storage tank unit 70, and recovering the supernatant of the sludge water concentrating unit 30 to the recovering unit 60;
step S500: discharging the sludge stored in the sludge storage tank unit 70 into the sludge dewatering unit 40, controlling the sludge dewatering unit 40 to dewater the sludge to form a sludge cake, and storing the sludge cake with the solid content up to the standard after dewatering into the dewatered sludge temporary storage unit 80;
step S600: and transferring the sludge cake stored in the dewatered sludge temporary storage unit 80 to the drying unit 50, and controlling the drying unit 50 to perform deep dewatering treatment on the sludge cake.
The method for treating the wastewater of the water works provided by the embodiment has the beneficial effects that:
(1) the embodiment effectively combines the waterline process and the mud line process, has simple process, meets the water quality requirement of water production, simultaneously reduces the volume of the structures of the mud drainage system as much as possible, has small floor area and less investment, and is suitable for the reconstruction of the mud drainage facility of the old waterworks.
(2) The embodiment effectively combines the waterline process and the mud line process, can recycle the backwash water and the supernatant, saves water resources, can improve the solid content of sludge water by recycling the backwash water and the supernatant, and improves the sludge treatment efficiency under the condition of not influencing water quality.
The step S500 further includes returning the dewatered sludge cake with the solid content not meeting the standard to the sludge storage tank unit 70.
Referring to fig. 7, in step S400, the confirming of the sludge inlet signal of the sludge water concentrating unit 30 according to the supernatant turbidity signal and the concentrating time of the sludge water concentrating unit 30 specifically includes:
step S401, reading a supernatant turbidity signal once every first preset time interval in a pump stop state; optionally, the first preset time is 5 s.
Step S402, determining whether the turbidity is less than a first preset Nephelometric Turbidity Unit (NTU), optionally, the first preset Nephelometric Turbidity Unit (NTU) is 8 NTU. If so, step S403 is performed, and if not, step S404 is performed.
Step S403, determining whether the concentration time is greater than a second preset time, optionally, the second preset time is 20 min. If yes, go to step S405.
Step S404: and judging whether the concentration time is greater than a third preset time, wherein optionally the third preset time is 60 min. If yes, the process proceeds to step S405, otherwise, the process enters a pump stop state, and the process returns to step S401.
Step S405, sending a pump starting signal, wherein the pump is in a pump starting state;
step S406, reading a supernatant turbidity signal once every fourth preset time in a pump-on state; optionally, the fourth preset time is 5 s.
Step S407, determining whether the turbidity is greater than a second preset Nephelometric Turbidity Unit (NTU), optionally, the second preset Nephelometric Turbidity Unit (NTU) is 20 NTU. If yes, go to step S408, otherwise, go back to step S406.
Step S408, determining whether the concentration time is greater than a fifth preset time, optionally, the fifth preset time is 10S. If yes, a pump stopping signal is sent out, a pump stopping state is immediately entered, the step S401 is returned, and if not, the step S406 is returned.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A waterworks wastewater treatment system, comprising:
the optimized discharge unit (10) of the production wastewater is used for precipitating and discharging the muddy water and filtering back washing water;
the sludge water adjusting unit (20) is communicated with the production wastewater optimized discharging unit (10) and is used for collecting the sludge water and pre-concentrating the sludge water;
the sludge water concentrating unit (30) is communicated with the sludge water adjusting unit (20) and is used for carrying out sludge water separation and concentration treatment on the pre-concentrated sludge water;
the sludge dewatering unit (40) is communicated with the sludge water concentrating unit (30) and is used for dewatering the separated sludge to form a sludge cake;
the drying unit (50) is communicated with the sludge dewatering unit and is used for carrying out deep dewatering treatment on the sludge cake formed after the dewatering treatment;
recovery unit (60), with the production wastewater optimizes discharge unit (10) sludge water regulating unit (20) sludge water concentration unit (30) all communicates, is used for retrieving the backwashing water of production wastewater optimizes discharge unit (10), retrieves sludge water regulating unit (20) preconcentration gained supernatant, recovery sludge water concentration unit (30) supernatant and be used for with the sediment bed mud in the backwashing water arrange sludge water regulating unit (20).
2. The waterworks wastewater treatment system of claim 1, wherein: the production wastewater optimized discharge unit (10) comprises a precipitation unit (11) for precipitating the sludge water and a filtration unit (12) for filtering the backwash water;
the external raw water is communicated with the sedimentation unit (11), the sedimentation unit (11) is communicated with the sludge water regulating unit (20), the sedimentation unit (11) is communicated with the filtering unit (12), and the filtering unit (12) is communicated with the recovery unit (60);
the sludge discharge period of the precipitation unit (11) and the back wash period of the filtering unit (12) are arranged in a staggered mode, so that wastewater is discharged in a staggered mode.
3. The waterworks wastewater treatment system of claim 2, wherein: the sedimentation unit (11) comprises a plurality of sludge discharge areas, each sludge discharge area is provided with a sludge discharge valve and each sludge discharge valve can be independently controlled through an electromagnetic valve, the electromagnetic valve is connected with a central control system through a programmable controller, and the central control system is used for independently discharging sludge through setting sludge discharge parameters of different sludge discharge areas so as to realize the independent sludge discharge of the sedimentation unit (11).
4. The waterworks wastewater treatment system of claim 3, wherein: sediment unit (11) are including anterior segment mud discharging region (111), middle section mud discharging region (112) and back end mud discharging region (113), through carry out sample detection to the suspended solid of the mud discharging water in each mud discharging section region to its concentration of analysis, and then confirm the mud discharging duration and the mud discharging cycle, and the mud discharging parameter that sets up through central control system according to the operation needs realizes automatic subregion mud discharging.
5. The waterworks wastewater treatment system of claim 1, wherein:
the bottom of the sludge discharge water adjusting unit (20) is provided with a first sludge scraper for scraping bottom sludge to a sludge hopper, the upper part of the sludge discharge water adjusting unit (20) is provided with a floating device, and the floating device is used for drawing out supernatant to be discharged or recycled to the recycling unit (60) so as to achieve the effect of pre-concentrating sludge discharge water;
or the bottom of the sludge discharge water adjusting unit (20) is provided with a second sludge scraper for scraping bottom sludge to a sludge hopper, the upper part of the sludge discharge water adjusting unit (20) is provided with a decanter, and after the sludge discharge water and the back flush water precipitate the bottom sludge and enter the sludge discharge water adjusting unit (20), supernatant can be reused after standing and settling for a preset time, so that the sludge discharge water preconcentration effect is achieved.
6. The waterworks wastewater treatment system of claim 1, wherein:
the sludge water concentration unit (30) comprises a gravity concentration tank;
an inclined plate (31) used for increasing the sedimentation area is filled in the gravity concentration tank, and the inclined plate (31) is supported and fixed through a first supporting beam (32);
or the gravity concentration tank is internally filled with an inclined pipe used for increasing the sedimentation area, and the inclined pipe is supported and fixed through a second supporting beam.
7. The waterworks wastewater treatment system of claim 1, wherein: the sludge water concentration unit (30) comprises a sludge lifting pump, an automatic control part, a polyacrylamide feeding system, a supernatant turbidity detector and a sludge inlet and outlet solid content detector;
the sludge lifting pump, the polyacrylamide feeding system, the supernatant turbidity detector and the sludge inlet and outlet solid content detector are all connected with the automatic control part, and the automatic control part is connected with the hollow system.
8. The waterworks wastewater treatment system of claim 1, wherein: the tap water plant wastewater treatment system further comprises a sludge storage tank unit (70), the sludge water concentration unit (30) is communicated with the sludge storage tank unit (70) and is used for storing sludge separated from the sludge water concentration unit (30), the sludge storage tank unit (70) is communicated with the sludge dewatering unit (40), the sludge stored in the sludge storage tank unit (70) is discharged into the sludge dewatering unit (40) for dewatering treatment to form a sludge cake, and the sludge cake with the lower solid content rate than the standard after the dewatering treatment flows back to the sludge storage tank unit (70);
the tap water plant wastewater treatment system further comprises a dehydrated sludge temporary storage unit (80), the sludge dehydration unit (40) is connected with the dehydrated sludge temporary storage unit (80), sludge cakes with the solid content up to the standard after dehydration are temporarily stored in the dehydrated sludge temporary storage unit (80), and the dehydrated sludge temporary storage unit (80) is connected with the drying unit (50).
9. The waterworks wastewater treatment system of claim 8, wherein:
and the dewatering equipment in the sludge dewatering unit (40) is a stacked screw dewatering machine or a centrifugal dewatering machine or a plate-frame type dewatering machine or a belt filter press for dewatering.
10. The waterworks wastewater treatment system of claim 8, wherein: the drying unit (50) deeply dehydrates the sludge through a low-temperature heat drying device.
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