CN112939263B - Device and method for recycling, activating and recycling sludge for purifying sewage - Google Patents

Device and method for recycling, activating and recycling sludge for purifying sewage Download PDF

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Publication number
CN112939263B
CN112939263B CN202011513452.1A CN202011513452A CN112939263B CN 112939263 B CN112939263 B CN 112939263B CN 202011513452 A CN202011513452 A CN 202011513452A CN 112939263 B CN112939263 B CN 112939263B
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sludge
valve
sewage
wgx
concentration
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CN112939263A (en
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尹志福
刘凌
郭学辉
王小艳
王毓
李永峰
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Xian University
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Xian University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

A recovery activation treatment device and method for purifying sewage by sludge circulation, wherein the device comprises a tank body, and a flotation separation cavity and a sludge collection cavity are arranged in the tank body; an air floatation device, a sludge lifting pump, a sludge feeding pump and a particle feeding pump are arranged in the cavity; the sludge can be recovered from the sludge basin or from the settling tank; the sludge is subjected to heavy treatment and oil removal treatment through floatation, a sludge modifying treatment agent WGX-1 and sludge can be added into a settling tank, after the addition amount is reached, the subsequent sludge is recovered from the sewage discharge process of the settling tank, and the sludge is added into the settling tank after floatation treatment; the adding amount of the sludge modification treatment agent WGX-1 in the initial stage is 1.5% -3%, the adding amount after normal operation is 20 mg/L-50 mg/L, the adding of coagulant aid is stopped in the operation process, and the concentration of other treatment agents is reduced; the invention can effectively reduce the dosage of the treating agent, reduce the output of the sludge, reduce the oil content of the sludge, improve the water quality treatment effect of the sewage, save the cost and is environment-friendly.

Description

Device and method for recycling, activating and recycling sludge for purifying sewage
Technical Field
The invention relates to the technical field of dosing and purifying treatment of oilfield sewage in the oilfield production process, in particular to a device and a method for recycling and activating sludge for purifying sewage.
Background
In the development process of the oil field, along with the development time, the separation water (sewage) of the oil well produced fluid is more and more, the separation water of the oil well produced fluid needs to be purified and treated to reach the standard and then is injected into oil layers of different oil wells, and the problem that the oil layer pressure is reduced in the exploitation process to cause the reduction of the production yield of the oil well of the oil field is solved.
At present, in oilfield production, except that physical methods such as a settling tank, a cyclone, air floatation and the like are used for assisting in settling and purifying, a large amount of chemical agents such as polyaluminium chloride, polymeric ferric sulfate, anionic polyacrylamide and the like are required to be used for purifying, and the use of the chemical agents improves the difference of sewage treatment on one hand, and on the other hand, relates to a series of environmental protection and ecological protection problems in the production link. And how to utilize the settled sludge in the sewage treatment process, the sludge is modified by adding a proper environment-friendly chemical treatment agent and recycled for sewage purification treatment, so that the sewage can be effectively purified, the consumption of the sewage treatment agent is reduced, and the sludge output of the sewage treatment is reduced.
Disclosure of Invention
In order to overcome the problems of the prior art, the invention aims to provide a recovery activation treatment device and a recovery activation treatment method for purifying sewage by using sludge circulation, which solve the problems of large amount of harmful chemical treatment agents, environmental pollution and high purification treatment cost of the prior sewage purification treatment.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the device for purifying sewage by recycling and activating sludge comprises a tank body 1, wherein a flotation separation cavity 2 at the upper part and a sludge collection cavity 3 at the lower part are arranged in the tank body 1;
an inlet flange 4 is arranged at one end of the flotation separation cavity 2, and the inlet flange 4 is connected with a first valve 9; the first valve 9 is connected with an outlet of the sludge lifting pump 10 and the second valve 11 through a tee joint; the inlet of the sludge lifting pump 10 is connected with a third valve 12 and a fourth valve 13 through a tee joint; the third valve 12 is connected with a drain pipeline outlet of the on-site sedimentation device, and the fourth valve 13 is connected with the bottom of the sludge tank;
the other end of the flotation separation cavity 2 is provided with an outlet flange 5, and the bottom of the sludge collection cavity 3 is provided with a bottom outlet flange 6; the bottom outlet flange 6 is connected with a fifth valve 14; the fifth valve 14 is connected with an inlet of a sludge feeding pump 15 and a sixth valve 16 through a tee joint, the sixth valve 16 is connected with an outlet of a particle feeding pump 18, and an inlet of the particle feeding pump 18 is connected with a particle material storage tank 19; the outlet of the sludge charging pump 15 is connected with a seventh valve 17, the seventh valve 17 is connected with the inlet of the mixer 20, and the outlet of the mixer 20 is connected with an inlet pipeline of the on-site sedimentation device;
a first air floatation device 7-1 is arranged in the floatation separation cavity 2; a second air floatation device 7-2 is arranged in the sludge collection cavity 3; the first air floatation device 7-1 and the second air floatation device 7-2 are connected with the air supply device 8.
The volume of the flotation separation cavity 2 is larger than that of the sludge collection cavity 3, and the volume of the flotation separation cavity 2 and the volume of the sludge collection cavity 3 are calculated according to (1)
V Floating cavity ＝F 1 ×V Collecting cavity (1)
V in Floating cavity Volume m of flotation separation chamber 2 3
V Collecting cavity Volume m of sludge collection chamber 3 3
F 1 The coefficients of 1.5 to 4 are preferably 1.5 to 2.5
The volume of the flotation separation chamber 2 is designed to be 0.3m 3 ～1m 3
The first flotation device 7-1 and the second flotation device 7-2 are diaphragm type microporous aerators, the diameters of the diaphragm type microporous aerators are selected to be 215mm, the first flotation device 7-1 is arranged in the middle of the flotation separation cavity 2 and is evenly distributed, and the second flotation device 7-2 is arranged at the bottom of the sludge collection cavity 3 and is evenly distributed.
The outlet flange 5 is higher than the inlet flange 4 by more than 30 mm.
The treatment method of the device for purifying sewage based on the sludge recovery activation treatment cycle comprises the following steps:
the first step: an opening A21 is arranged in front of a coagulant adding port on a sedimentation tank inlet pipeline of an on-site raw sewage treatment process, and an outlet of a mixer 20 of the sludge recovery activation treatment device is connected with the opening A21 and is provided with a valve; an eighth valve 22 of a sedimentation tank sludge discharge pipeline of the on-site raw sewage treatment device is connected with a pipeline connected with a sewage pool, a B opening 23 is arranged on the pipeline, a ninth valve 24 is arranged on the pipeline, and an outlet of a third valve 12 of the sludge recovery activation treatment device is connected with the B opening 23;
and a second step of: when the sludge recycling and activating treatment device starts to operate, the fourth valve 13 and the first valve 9 of the sludge recycling and activating treatment device are opened, and the second valve 11 and the third valve 12 are closed; starting a sludge lifting pump 10 to lift sludge from a sludge tank of the sewage station to the flotation separation chamber 2;
and a third step of: starting the air supply device 8 to supply air to the first flotation device 7-1 and the second flotation device 7-2, wherein the air flow is set to be 0.5m 3 H-3 m 3 H is preferably 2.2m 3 H;
fourth step: after the flotation separation cavity 2 of the sludge recovery activation treatment device is filled with sludge, continuously lifting the sludge and floating for 0.5-2 hours, and optimally 1 hour;
fifth step: stopping the sludge lifting pump 10, opening the eighth valve 22 and the ninth valve 24, closing the valve 12, discharging the sewage of the on-site sedimentation device, stopping the sewage discharge after the discharged liquid is clear, and closing the eighth valve 22 and the ninth valve 24;
sixth step:
starting a sludge feeding pump 15, wherein the displacement of the sludge feeding pump 15 is matched with the displacement or the self-pressure displacement of a sewage lifting pump in front of a site sedimentation device, and the relative sewage (v/v) sludge feeding concentration is 0.1% -1% (optimally 0.2% -0.4%);
seventh step:
opening an outlet valve of the particle feeding pump 18, and starting the particle feeding pump 18 to feed the sludge modification treatment agent WGX-1, wherein the feeding concentration of the sludge modification treatment agent WGX-1 is 0.1% -5%, and optimally 1.5% -3% relative to the feeding amount (m/v) of the sludge;
eighth step: stopping adding coagulant aid by using the original flow adding device, adding flocculant, controlling the adding amount to be 0.5-3 mg/L, and optimally 1.0-1.5 mg/L relative to the sewage; continuously adding coagulant, bactericide, corrosion inhibitor and scale inhibitor by using an original process dosing device, and properly reducing the adding concentration according to the filtered water property;
ninth step: the addition amount of the sludge reaches the required value V Throwing in Then, the sludge lifting pump 10 is shut down, the fourth valve 13 is closed, the third valve 12 is opened, the second valve 11 is opened, the eighth valve 22 is opened, the sludge of the sedimentation device in the field sewage treatment process flow enters the sludge recovery activation treatment device, the third valve 12 is regulated and controlled, and the sludge amount in the sludge recovery activation treatment device is maintained at 2/3 of the total volume;
sludge addition amount V Throwing in Performing calculation according to (2)
V Throwing in ＝F 2 ×S Sinking and sinking (2)
S in Sinking and sinking Area m of the bottom of the settling tank 2
V Throwing in The sludge quantity m to be added 3
F 2 The coefficient is 0.05-0.3 and optimally 0.08-0.15;
tenth step: the addition amount of the sludge reaches the required value V Throwing in Then, the adding concentration of the sludge modification treatment agent WGX-1 is reduced, the adding concentration of the sludge modification treatment agent WGX-1 is set to be 10mg/L to 200mg/L, optimally 20mg/L to 50mg/L, the adding amount of the flocculant is further reduced, and the adding amount of the flocculant is set to be 0.1mg/L to 1mg/L (optimally 0.2mg/L to 0.5 mg/L) relative to the sewage;
eleventh step: adding sludge according to the sludge adding concentration of 0.2-0.4% relative to the sewage quantity (v/v); adding the sludge modifying treatment agent WGX-1 according to the adding concentration of the sludge modifying treatment agent WGX-1 of 20mg/L to 50mg/L relative to the adding amount of the sludge; adding flocculant according to the concentration of the flocculant of 0.2-0.5 mg/L relative to the sewage, and continuously running the sewage according to the unchanged concentration of coagulant, bactericide, corrosion inhibitor and scale inhibitor in the eighth step;
twelfth step: when the suspended matter content in the filtered sewage slightly exceeds the standard requirement value, the concentration of the sludge modification treatment agent WGX-1 is increased to 50 mg/L-200 mg/L relative to the sludge addition amount and added for 30 min-120 min, and the eleventh step of continuous operation is recovered after the optimal 40 min-50 min; when the suspended matter content in the filtered sewage slightly exceeds the standard requirement value, the concentration of the sludge modification treatment agent WGX-1 is increased to 50 mg/L-200 mg/L relative to the sludge addition amount, and the sludge modification treatment agent WGX-1 is added for 30 min-120 min, and is recovered after 40 min-50 min optimally, and is recovered to the eleventh step for continuous operation, and the repeated circulation is performed.
The sludge modification treatment agent WGX-1 is powder, and the composition of the sludge modification treatment agent WGX-1 is a mixture of one or more of the following materials in different proportions according to the mass ratio: 0 to 100 percent of walnut shell powder, 0 to 100 percent of talcum powder, 0 to 100 percent of quartz sand powder, 0 to 100 percent of fly ash powder, 0 to 100 percent of mica powder, 0 to 100 percent of light calcium carbonate powder, 0 to 100 percent of heavy calcium carbonate powder, 0 to 100 percent of barite powder, 0 to 100 percent of other inert powder and the particle diameter of 50 to 2000 meshes.
The sludge modification treatment agent WGX-1 has the optimal composition: 30% of light calcium carbonate powder, 40% of fly ash powder, 30% of walnut shell powder, and the particle diameter is 1200-1500 meshes.
The technical principle and effect of the invention are as follows:
1. the sludge modification treatment agent WGX-1 is added into sludge, mixed with the sludge and wrapped by the sludge, and the WGX-1 utilizes the particle activity of the sludge, so that on one hand, the activity of the sludge is improved, on the other hand, the density of the sludge is improved, suspended matters in the sewage can be more effectively adsorbed after the sludge modification treatment agent WGX-1 is added into the sewage, large particles are formed, the density is increased, the sedimentation speed is increased, and therefore, the efficiency of a sewage treatment sedimentation device is more effectively improved, and the purification effect is improved.
2. The sludge passes through a sludge recovery activation treatment device, a flotation part removes a large amount of dirty oil in the sludge, light sludge floats on the sludge and is discharged from an outlet flange 5 of a flotation separation cavity 2 together with the dirty oil, and heavy sludge containing a sludge modification treatment agent WGX-1 is settled in a sludge collection cavity 3, so that activated sludge with less oil and large density is obtained.
3. The sludge modification treating agent WGX-1 is added into the sludge, so that the formed active particles can replace the polyaluminium chloride of the sewage treating agent, and the dosage of the polyacrylamide treating agent can be reduced.
4. The calcium carbonate can properly improve the pH value of the sewage in the slightly acidic sewage to form calcium bicarbonate without causing scale formation, the walnut shell powder can generate certain biochemical action in the sewage, and the surface of the particles continuously generate biochemical reaction to enable the particles to have certain activity, so that the sludge formed by the sludge modification treatment agent WGX-1 can be recycled.
5. The water absorption rate of the calcium carbonate powder, the fly ash powder and the walnut shell powder is very small, the water content of the formed sludge is low, the water content of the general sludge is over 99 percent, the water content of the sludge formed by the sludge modification treatment agent WGX-1 can be lower than 75 percent, the produced sludge is easy to filter press treatment, the treatment difficulty of the sludge is reduced, and the treatment cost is reduced.
6. The sludge formed by the sludge modification treatment agent WGX-1 has low oil content and high flotation removal rate, and reduces the waste of oil and the pollution of oil.
7. After oil is removed from the sludge formed by the sludge modification treatment agent WGX-1, walnut shells and fly ash in the sludge can be applied to fertilizer, and calcium carbonate has a loosening effect on soil, so that a way of harmless utilization of the sludge is improved.
8. The utilization of the fly ash widens the way for harmless utilization of the fly ash of the power plant and plays a certain role in environmental protection.
9. The sludge modification treatment agent WGX-1 replaces polyaluminium chloride, simultaneously greatly reduces the use amount of flocculant, reduces the production and operation costs, simultaneously reduces a series of environmental destruction and pollution problems related to the production links, and reduces the dependence on earth resources.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 shows the connection mode of the device of the invention and a settling tank of the field original sewage treatment process flow.
FIG. 3 is a flow chart of an on-site raw sewage treatment process according to the first embodiment.
FIG. 4 shows an embodiment of the present invention of a connection of the apparatus to a settling tank of an in situ raw sewage treatment process.
FIG. 5 is a flow chart of an example two-site raw sewage treatment process.
FIG. 6 shows a settling tank connection of the apparatus of the present invention to an in situ raw sewage treatment process.
FIG. 7 is a flow chart of an on-site raw sewage treatment process according to the third embodiment.
FIG. 8 shows a third embodiment of the present invention of a settling tank connection to an in situ raw sewage treatment process.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a recovery activation treatment device for purifying sewage by sludge circulation comprises a tank 1, wherein a flotation separation chamber 2 at the upper part and a sludge collection chamber 3 at the lower part are arranged in the tank 1;
an inlet flange 4 is arranged at one end of the flotation separation cavity 2, and the inlet flange 4 is connected with a first valve 9; the first valve 9 is connected with an outlet of the sludge lifting pump 10 and the second valve 11 through a tee joint; the inlet of the sludge lifting pump 10 is connected with a third valve 12 and a fourth valve 13 through a tee joint; the third valve 12 is connected with a drain pipeline outlet of the on-site sedimentation device, and the fourth valve 13 is connected with the bottom of the sludge tank;
the other end of the flotation separation cavity 2 is provided with an outlet flange 5, and the bottom of the sludge collection cavity 3 is provided with a bottom outlet flange 6; the bottom outlet flange 6 is connected with a fifth valve 14; the fifth valve 14 is connected with an inlet of a sludge feeding pump 15 and a sixth valve 16 through a tee joint, the sixth valve 16 is connected with an outlet of a particle feeding pump 18, and an inlet of the particle feeding pump 18 is connected with a particle material storage tank 19; the outlet of the sludge feeding pump 15 is connected with a seventh valve 17, the seventh valve 17 is connected with a mixer 20, and the mixer 20 is connected with an inlet pipeline of the on-site sedimentation device;
a first air floatation device 7-1 is arranged in the floatation separation cavity 2; a second air floatation device 7-2 is arranged in the sludge collection cavity 3; the first air floatation device 7-1 and the second air floatation device 7-2 are connected with the air supply device 8.
The volume of the flotation separation cavity 2 is larger than that of the sludge collection cavity 3, and the volume of the flotation separation cavity 2 and the volume of the sludge collection cavity 3 are calculated according to (1)
V Floating cavity ＝F 1 ×V Collecting cavity (1)
V in Floating cavity Volume m of flotation separation chamber 2 3
V Collecting cavity Volume m of sludge collection chamber 3 3
F 1 The coefficients of 1.5 to 4 are preferably 1.5 to 2.5
The volume of the flotation separation chamber 2 is designed to be 0.3m 3 ～1m 3 。
The first flotation device 7-1 and the second flotation device 7-2 are diaphragm type microporous aerators, the diameters of the diaphragm type microporous aerators are selected to be 215mm, the first flotation device 7-1 is arranged in the middle of the flotation separation cavity 2 and is evenly distributed, and the second flotation device 7-2 is arranged at the bottom of the sludge collection cavity 3 and is evenly distributed.
The outlet flange 5 is higher than the inlet flange 4 by more than 30 mm.
The treatment method based on the recovery activation treatment device for purifying sewage by using the sludge circulation is described in detail by combining the embodiments. Sludge modification treatment agent WGX-1 described in the following three examples: 30% of light calcium carbonate powder, 40% of fly ash powder, 30% of walnut shell powder, and the particle diameter is 1200-1500 meshes.
Example 1
1. Original sewage treatment process flow and effect on site
1. The process flow of the on-site raw sewage treatment is shown in figure 3.
2. Bottom area of inclined plate sedimentation tank
The inclined plate sedimentation tank is a round tank, the bottom diameter is 6m, and the bottom area is 28.26m 2 。
3. Sewage treatment capacity
The standard modulus of sewage treatment is 120m 3 /h
4. Chemical adding process for on-site raw sewage treatment process flow
The coagulant dosing concentration is 63mg/L, the coagulant dosing concentration is 137mg/L, the coagulant dosing concentration is 8.5mg/L, the bactericide dosing concentration is 160mg/L, the corrosion inhibitor dosing concentration is 120mg/L, and the scale inhibitor dosing concentration is 17mg/L.
5. Running effect of field original sewage treatment process flow (running process sampling test average value)
The content of suspended matters in filtered sewage is more than or equal to 4.6mg/L (standard requirement is less than or equal to 3 mg/L), the content of oil is more than or equal to 16.3mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is more than or equal to 3.2mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is more than or equal to 45 SRB/mL (standard requirement is less than or equal to 10/mL), the corrosion rate is more than or equal to 0.067mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 1.4mg/L (standard requirement is 2.6 mg/L).
All the other indexes exceed the standard requirement value except that the corrosion rate and the scaling amount reach the requirement indexes.
2. Application and effect of treatment method for purifying sewage by applying the invention
1. Parameters of sludge recovery activation treatment device
The volume of the flotation separation chamber 2 was set to 0.6m 3 。
The volume of the sludge collection chamber 3 is calculated according to (1), parameter F 1 Selected to be 2.0, the volume of the sludge collection chamber 3 was 0.3m 3 。
2. Treatment method for purifying sewage by sludge recovery activation treatment device
The first step: the sludge recovery activation treatment device is connected with the on-site original process flow, and an opening A21 is arranged in front of a dosing port of a coagulant aid on an inlet pipeline of a settling tank of the on-site original sewage treatment process flow, and an outlet of a mixer 20 of the sludge recovery activation treatment device is connected with the opening 21 and is provided with a valve; an eighth valve 22 of a sedimentation tank sludge discharge pipeline of the on-site raw sewage treatment device is connected with a sewage tank, a B opening 23 is arranged on the pipeline, a ninth valve 24 is arranged on the pipeline, and an outlet of a third valve 12 of the sludge recovery activation treatment device is connected with the B opening 23. Referring to fig. 4, two mixers are employed in this embodiment based on the other apparatus referred to in fig. 2;
and a second step of: when the device starts to operate, a fourth valve 13 of the sludge recovery activation treatment device is opened, a first valve 9 is closed, a second valve 11 and a third valve 12 are closed, and a sludge lifting pump 10 is started to lift sludge from a sludge tank of a sewage station to the flotation separation cavity 2;
and a third step of: starting the air supply device 8 to supply air to the first flotation device 7-1 and the second flotation device 7-2, wherein the air flow is set to be 2.2m 3 H;
fourth step: after the flotation separation cavity 2 of the sludge recovery activation treatment device is filled with sludge, continuously lifting the sludge and carrying out flotation for 1 hour;
fifth step: opening the valve 22 and the valve 24, closing the valve 12, discharging the sewage of the on-site sedimentation device, and stopping discharging the sewage after the discharged liquid is clear;
sixth step: starting a sludge feeding pump 15, wherein the discharge capacity of the sludge feeding pump is matched with the discharge capacity (or self-pressure discharge capacity) of a sewage lifting pump of a site sedimentation tank, and the feeding concentration of the sludge is 0.2% (relative sewage volume v/v);
seventh step: starting a particle feeding pump 18 to feed the sludge modification treatment agent WGX-1, wherein the feeding concentration of the sludge modification treatment agent WGX-1 is 1.8% (relative to the feeding amount of the sludge m/v);
eighth step: stopping adding coagulant aid by using the original flow dosing device, adding flocculant, wherein the adding concentration of the flocculant is set to be 1.2mg/L (relative to sewage); the dosing concentration of the coagulant is reduced to 57mg/L, the dosing concentration of the bactericide is reduced to 140mg/L, the dosing concentration of the corrosion inhibitor is reduced to 105mg/L, and the dosing concentration of the scale inhibitor is reduced to 15mg/L;
ninth step: the addition amount of the sludge reaches the required value V Throwing in After that, the sludge lifting pump 10 is shut down, the fourth valve 13 is closed, the third valve 12 is opened, the second valve 11 is opened, the eighth valve 22 is opened, and in the field sewage treatment process flowThe sludge of the sedimentation device enters a sludge recycling and activating treatment device, a third valve 12 is regulated and controlled, and the sludge amount in the sludge recycling and activating treatment device is maintained to be about 2/3 of the total volume;
sludge addition amount V Throwing in Calculation according to (2), F 2 Coefficient is 0.1, and the addition amount of sludge is V Throwing in 2.826m 3 ；
Tenth step: the adding amount of the sludge reaches 2.826m 3 Then, the adding concentration of the sludge modification treatment agent WGX-1 is reduced, the adding amount of the flocculant is set to be 30mg/L (relative to the adding amount of the sludge), and the adding amount of the flocculant is set to be 0.35mg/L (relative to the sewage amount);
eleventh step: adding sludge according to the concentration of the sludge of 0.2 percent (relative sewage volume v/v), adding a sludge modification treatment agent WGX-1 according to the concentration of a sludge modification treatment agent WGX-1 of 30mg/L (relative sludge addition volume m/v), adding a flocculating agent according to the concentration of a flocculating agent of 0.35mg/L (relative sewage volume v/v), and continuously running according to the requirement of the eighth step, wherein the adding concentration of the flocculating agent, the bactericide, the corrosion inhibitor and the scale inhibitor is unchanged;
twelfth step: in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 120mg/L (relative to the sludge addition amount), and the continuous operation is recovered to the eleventh step after the addition time is 40min under the concentration;
in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 120mg/L (relative to the sludge addition amount), and the continuous operation is recovered to the eleventh step after the addition time is 40min under the concentration.
3. The effect of this example on purifying sewage (running process sampling test average)
The content of suspended matters in filtered sewage is less than or equal to 2.7mg/L (standard requirement is less than or equal to 3 mg/L), the content of oil is less than or equal to 8.4mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is less than or equal to 0.2mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is less than or equal to 2.5 pieces/mL (standard requirement is less than or equal to 10 pieces/mL), the corrosion rate is less than or equal to 0.062mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 0.2mg/L (standard requirement is 2.6 mg/L).
Example two
1. On-site raw sewage treatment process flow and effect
1. On-site raw sewage treatment process flow
The field raw sewage treatment process flow is shown in figure 5.
2. Bottom area of inclined plate sedimentation tank
The inclined plate sedimentation tank is a square tank, the bottom is 2.5m wide and 6.6 m long, and the bottom area is 16.5m 2 。
3. Sewage treatment capacity
The standard modulus of sewage treatment is 40m 3 /h
4. On-site original medicine adding process
The coagulant dosing concentration is 87mg/L, the coagulant dosing concentration is 183mg/L, the coagulant dosing concentration is 10.2mg/L, the bactericide dosing concentration is 196mg/L, the corrosion inhibitor dosing concentration is 145mg/L, and the scale inhibitor dosing concentration is 32mg/L.
5. Running effect of field original sewage treatment process flow (running process sampling test average value)
The content of suspended matters in filtered sewage is more than or equal to 3.1mg/L (standard requirement is less than or equal to 2 mg/L), the content of oil is more than or equal to 12.7mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is more than or equal to 1.4mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is more than or equal to 30 SRB/mL (standard requirement is less than or equal to 10/mL), the corrosion rate is more than or equal to 0.082mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 1.7mg/L (standard requirement is 3.5 mg/L).
Except that the scale formation reaches the required index, all the other indexes exceed the standard required value.
2. Application and effect of treatment method for purifying sewage by sludge recovery activation treatment device
1. Parameters of sludge recovery activation treatment device
The volume of the flotation separation chamber 2 was set to 0.4m 3 。
The volume of the sludge collection chamber 3 is calculated according to (1), parameter F 1 Selected to be 2.0, the volume of the sludge collection chamber 3 is 0.2m 3 。
2. Treatment method for purifying sewage by sludge recovery activation treatment device
The first step: the sludge recovery activation treatment device is connected with the on-site original process flow, and an opening A21 is arranged in front of a dosing port of a coagulant aid on an inlet pipeline of a settling tank of the on-site original sewage treatment process flow, and an outlet of a mixer 20 of the sludge recovery activation treatment device is connected with the opening 21 and is provided with a valve; an eighth valve 22 of a sedimentation tank sludge discharge pipeline of the on-site raw sewage treatment device is connected with a pipeline connected with a sewage pool, a B opening 23 is arranged on the pipeline, a ninth valve 24 is arranged on the pipeline, and an outlet of a third valve 12 of the sludge recovery activation treatment device is connected with the B opening 23; referring to fig. 6, a dissolved air flotation device is employed based on the other device referred to in fig. 2;
and a second step of: when the device starts to operate, a fourth valve 13 of the sludge recovery activation treatment device is opened, a first valve 9 is closed, a second valve 11 and a third valve 12 are closed, and a sludge lifting pump 10 is started to lift sludge from a sludge tank of a sewage station to the flotation separation cavity 2;
and a third step of: starting the air supply device 8 to supply air to the first flotation device 7-1 and the second flotation device 7-2, wherein the air flow is set to be 2.2m 3 H;
fourth step: after the flotation separation cavity 2 of the sludge recovery activation treatment device is filled with sludge, continuously lifting the sludge and carrying out flotation for 1 hour;
fifth step: opening the valve 22 and the valve 24, closing the valve 12, discharging the sewage of the on-site sedimentation device, and stopping discharging the sewage after the discharged liquid is clear;
sixth step: starting a sludge feeding pump 15, wherein the discharge capacity of the sludge feeding pump is matched with the discharge capacity (or self-pressure discharge capacity) of a sewage lifting pump of a site sedimentation tank, and the feeding concentration of the sludge is 0.25% (relative sewage volume v/v);
seventh step: starting a particle feeding pump 18 to feed the sludge modification treatment agent WGX-1, wherein the feeding concentration of the sludge modification treatment agent WGX-1 is 2% (relative to the feeding amount of the sludge m/v);
eighth step: stopping adding coagulant aid by using the original flow dosing device, adding flocculant, wherein the adding concentration of the flocculant is set to be 1.4mg/L (relative to sewage); the coagulant dosing concentration is reduced to 72mg/L, the bactericide dosing concentration is reduced to 165mg/L, the corrosion inhibitor dosing concentration is reduced to 120mg/L, and the scale inhibitor dosing concentration is reduced to 28mg/L;
ninth step: the addition amount of the sludge reaches the required value V Throwing in Then, the sludge lifting pump 10 is shut down, the fourth valve 13 is closed, the third valve 12 is opened, the second valve 11 is opened, the eighth valve 22 is opened, the sludge of the sedimentation device in the field sewage treatment process flow enters the sludge recovery activation treatment device, the third valve 12 is regulated and controlled, and the sludge amount in the sludge recovery activation treatment device is maintained to be about 2/3 of the total volume;
sludge addition amount V Throwing in Calculation according to (2), F 2 Coefficient 0.12, sludge addition amount V Throwing in 1.98m 3 ；
Tenth step: the adding amount of the sludge reaches 1.98m 3 Then, the adding concentration of the sludge modification treatment agent WGX-1 is reduced, the adding amount of the flocculant is set to be 35mg/L (relative to the adding amount of the sludge), and the adding amount of the flocculant is set to be 0.3mg/L (relative to the sewage amount);
eleventh step: adding sludge according to the concentration of the sludge of 0.25% (relative sewage volume v/v), adding a sludge modification treatment agent WGX-1 according to the concentration of a sludge modification treatment agent WGX-1 of 35mg/L (relative sludge addition volume m/v), adding a flocculating agent according to the concentration of a flocculating agent of 0.3mg/L (relative sewage volume v/v), and continuously running according to the requirement of the eighth step, wherein the adding concentration of the flocculating agent, the bactericide, the corrosion inhibitor and the scale inhibitor is unchanged;
twelfth step: in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 140mg/L (relative to the sludge addition amount), and the continuous operation is recovered to the eleventh step after the addition time is 50min under the concentration;
in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 140mg/L (relative to the sludge addition amount), the addition time is 50min at the concentration, and the operation is recovered to the eleventh step for continuous operation, and the repeated circulation is performed.
3. The effect of this example on purifying sewage (running process sampling test average)
The content of suspended matters in filtered sewage is less than or equal to 1.7mg/L (standard requirement is less than or equal to 2 mg/L), the content of oil is less than or equal to 7.8mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is less than or equal to 0.05mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is less than or equal to 3.5 pieces/mL (standard requirement is less than or equal to 10 pieces/mL), the corrosion rate is less than or equal to 0.056mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 0.1mg/L (standard requirement is 3.5 mg/L).
Example III
1. On-site raw sewage treatment process flow and effect
1. The field raw sewage treatment process flow is shown in figure 7
2. Bottom area of tube settler
The inclined plate sedimentation tank is a square tank, the bottom is 2.7m wide and 9.3 m long, and the bottom area is 25.11m 2 。
3. Sewage treatment capacity
The standard modulus of sewage treatment is 65m 3 /h
4. On-site original medicine adding process
The coagulant dosing concentration is 105mg/L, the coagulant dosing concentration is 154mg/L, the coagulant dosing concentration is 8.4mg/L, the bactericide dosing concentration is 175mg/L, the corrosion inhibitor dosing concentration is 130mg/L, and the scale inhibitor dosing concentration is 26mg/L.
5. Running effect of field original sewage treatment process flow (running process sampling test average value)
The content of suspended matters in filtered sewage is more than or equal to 2.7mg/L (standard requirement is less than or equal to 2 mg/L), the content of oil is more than or equal to 12.2mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is more than or equal to 0.9mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is more than or equal to 30 SRB/mL (standard requirement is less than or equal to 10/mL), the corrosion rate is more than or equal to 0.085mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 0.8mg/L (standard requirement is 1.6 mg/L).
Except that the scale formation reaches the required index, all the other indexes exceed the standard required value. 2. The invention relates to the application and effect of the treatment method for purifying sewage
1. Parameters of sludge recovery activation treatment device
The volume of the flotation separation chamber 2 was set to 0.5m 3 。
The volume of the sludge collection chamber 3 is calculated according to (1), parameter F 1 Selected to be 2.0, the volume of the sludge collection cavity 3 is 0.25m 3 。
2. Treatment method for purifying sewage by sludge recovery activation treatment device
The first step: the sludge recovery activation treatment device is connected with the on-site original process flow, and an opening A21 is arranged in front of a dosing port of a coagulant aid on an inlet pipeline of a settling tank of the on-site original sewage treatment process flow, and an outlet of a mixer 20 of the sludge recovery activation treatment device is connected with the opening 21 and is provided with a valve; an eighth valve 22 of a sedimentation tank sludge discharge pipeline of the on-site raw sewage treatment device is connected with a pipeline connected with a sewage pool, a B opening 23 is arranged on the pipeline, a ninth valve 24 is arranged on the pipeline, and an outlet of a third valve 12 of the sludge recovery activation treatment device is connected with the B opening 23; referring to fig. 8, the present embodiment employs an induced flotation cell based on the other apparatus indicated in fig. 2;
and a second step of: when the device starts to operate, a fourth valve 13 of the sludge recovery activation treatment device is opened, a first valve 9 is closed, a second valve 11 and a third valve 12 are closed, and a sludge lifting pump 10 is started to lift sludge from a sludge tank of a sewage station to the flotation separation cavity 2;
and a third step of: starting the air supply device 8 to supply air to the first flotation device 7-1 and the second flotation device 7-2, wherein the air flow is set to be 2.2m 3 H;
fourth step: after the flotation separation cavity 2 of the sludge recovery activation treatment device is filled with sludge, continuously lifting the sludge and carrying out flotation for 1 hour;
fifth step: opening the valve 22 and the valve 24, closing the valve 12, discharging the sewage of the on-site sedimentation device, and stopping discharging the sewage after the discharged liquid is clear;
sixth step: starting a sludge feeding pump 15, wherein the discharge capacity of the sludge feeding pump is matched with the discharge capacity (or self-pressure discharge capacity) of a sewage lifting pump of a site sedimentation tank, and the feeding concentration of the sludge is 0.22% (relative sewage volume v/v);
seventh step: starting a particle feeding pump 18 to feed the sludge modification treatment agent WGX-1, wherein the feeding concentration of the sludge modification treatment agent WGX-1 is 1.6% (relative to the feeding amount of the sludge m/v);
eighth step: stopping adding coagulant aid by using the original flow dosing device, adding flocculant, wherein the adding concentration of the flocculant is set to be 1.1mg/L (relative to sewage); the coagulant dosing concentration is reduced to 72mg/L, the bactericide dosing concentration is reduced to 165mg/L, the corrosion inhibitor dosing concentration is reduced to 120mg/L, and the scale inhibitor dosing concentration is reduced to 21mg/L;
ninth step: the addition amount of the sludge reaches the required value V Throwing in Then, the sludge lifting pump 10 is shut down, the fourth valve 13 is closed, the third valve 12 is opened, the second valve 11 is opened, the eighth valve 22 is opened, the sludge of the sedimentation device in the field sewage treatment process flow enters the sludge recovery activation treatment device, the third valve 12 is regulated and controlled, and the sludge amount in the sludge recovery activation treatment device is maintained to be about 2/3 of the total volume;
sludge addition amount V Throwing in Calculation according to (2), F 2 Coefficient 0.11, sludge addition amount V Throwing in Is 2.76m 3 ；
Tenth step: the adding amount of the sludge reaches 2.76m 3 Then, the adding concentration of the sludge modification treatment agent WGX-1 is reduced, the adding amount of the flocculant is set to be 28mg/L (relative to the adding amount of the sludge), and the adding amount of the flocculant is set to be 0.23mg/L (relative to the sewage amount);
eleventh step: adding sludge according to the concentration of the sludge of 0.22 percent (relative sewage volume v/v), adding a sludge modification treatment agent WGX-1 according to the concentration of a sludge modification treatment agent WGX-1 of 28mg/L (relative sludge addition volume m/v), adding a flocculating agent according to the concentration of a flocculating agent of 0.23mg/L (relative sewage volume v/v), and continuously running according to the requirement of the eighth step, wherein the adding concentration of the flocculating agent, the bactericide, the corrosion inhibitor and the scale inhibitor is unchanged;
twelfth step: in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 95mg/L (relative to the sludge addition amount), and the continuous operation is recovered to the eleventh step after the addition time is 50min under the concentration;
in the continuous operation process, the suspended matter content exceeds the standard, the concentration of the sludge modification treatment agent WGX-1 is increased to 95mg/L (relative to the sludge addition amount), the addition time is 50min at the concentration, and the operation is recovered to the eleventh step for continuous operation, and the repeated circulation is performed.
3. The effect of this example on purifying sewage (running process sampling test average)
The content of suspended matters in filtered sewage is less than or equal to 1.4mg/L (standard requirement is less than or equal to 2 mg/L), the content of oil is less than or equal to 6.7mg/L (standard requirement is less than or equal to 10 mg/L), the total iron content is less than or equal to 0.02mg/L (standard requirement is less than or equal to 0.5 mg/L), the SRB content is less than or equal to 7.5 pieces/mL (standard requirement is less than or equal to 10 pieces/mL), the corrosion rate is less than or equal to 0.065mm/a (standard requirement is less than or equal to 0.076 mm/a), and the scaling amount is 0mg/L (standard requirement is 1.6 mg/L).
Effect analysis of particular embodiments
1. Comparison of sewage treatment index effects
The effect of the treated and filtered sewage of the raw sewage treatment process of the first, second and third embodiments and the effect of the filtered sewage treated by the treatment method for purifying sewage by using the sludge recovery activation treatment device are counted, and the statistical data are shown in table 1. Data from table 1 reflect: the scale removal amount of the filtered sewage after the treatment of the original sewage treatment process can reach the standard requirement value, and other indexes can not reach the standard requirement value; after the sludge recovery activation treatment device is used for the treatment method of the sludge purified sewage, all indexes of the filtered sewage can reach standard requirement values.
Table 1 post-treatment filtered sewage test data
2. Comparison of sludge output in sewage treatment
Counting the output of the sludge after the treatment of the raw sewage treatment process of the first embodiment, the second embodiment and the third embodiment and the output of the sludge after the treatment of the sewage purified by adopting the treatment method of the sludge recovery activation treatment device; the reagents for generating sludge in the sewage treatment agent mainly comprise flocculant, coagulant aid and sludge modification treatment agent, and the statistical data are shown in Table 2.
Data from table 2 reflect: compared with the original field process, the sludge reduction amount of the invention reaches more than 79 percent.
TABLE 2 sludge output from different treatments
3. Comparison of the usage amount of sewage treatment agent
The statistics of the dosage of the agent used in the raw sewage treatment process of the first embodiment, the second embodiment and the third embodiment and the dosage of the agent used in the treatment method for purifying sewage by adopting the sludge recovery activation treatment device are shown in table 3.
Data from table 3 reflect: compared with the original technical method on site, the invention reduces the drug adding cost by more than 30 percent.
TABLE 3 different treatments, run procedure dosing of the agent
4. Conclusion(s)
Compared with the original field process method, the treatment method saves more than 30 percent of cost; greatly reduces the output of the sludge, and the reduction rate of the output of the sludge reaches more than 79 percent; can ensure that the filtered sewage stably reaches the standard requirement value, and has good economic benefit, social benefit and environmental protection benefit.

Claims (7)

1. A treatment method of a device for purifying sewage by recycling and activating sludge, the device comprises a tank body (1), a flotation separation cavity (2) at the upper part and a sludge collection cavity (3) at the lower part in the tank body (1);
one end of the flotation separation cavity (2) is provided with an inlet flange (4), and the inlet flange (4) is connected with a first valve (9); the first valve (9) is connected with an outlet of the sludge lifting pump (10) and the second valve (11) through a tee joint; the inlet of the sludge lifting pump (10) is connected with a third valve (12) and a fourth valve (13) through a tee joint; the third valve (12) is connected with a drain pipeline outlet of the on-site sedimentation device, and the fourth valve (13) is connected with the bottom of the sludge tank;
an outlet flange (5) is arranged at the other end of the flotation separation cavity (2), and a bottom outlet flange (6) is arranged at the bottom of the sludge collection cavity (3); the bottom outlet flange (6) is connected with a fifth valve (14); the fifth valve (14) is connected with an inlet of a sludge feeding pump (15) and a sixth valve (16) through a tee joint, the sixth valve (16) is connected with an outlet of a particle feeding pump (18), and an inlet of the particle feeding pump (18) is connected with a particle material storage tank (19); the outlet of the sludge feeding pump (15) is connected with a seventh valve (17), the seventh valve (17) is connected with the inlet of the mixer (20), and the outlet of the mixer (20) is connected with an inlet pipeline of the on-site sedimentation device;
a first air floatation device (7-1) is arranged in the floatation separation cavity (2); a second air floatation device (7-2) is arranged in the sludge collection cavity (3); the first air floatation device (7-1) and the second air floatation device (7-2) are connected with the air supply device (8);
the method is characterized by comprising the following steps of:
the first step: an opening A (21) is arranged in front of a dosing port of a coagulant aid on an inlet pipeline of a settling tank of an on-site raw sewage treatment process, and an outlet of a mixer (20) of the sludge recycling and activating treatment device is connected with the opening A (21) and is provided with a valve; an eighth valve (22) of a sedimentation tank sludge discharge pipeline of the on-site raw sewage treatment device is provided with a B opening (23) and a ninth valve (24) on a pipeline connected with a sewage tank, and an outlet of a third valve (12) of the sludge recovery activation treatment device is connected with the B opening (23);
and a second step of: when the device starts to operate, a fourth valve (13) and a first valve (9) of the sludge recovery activation treatment device are opened, a second valve (11) and a third valve (12) are closed, and a sludge lifting pump (10) is started to lift sludge from a sludge tank of a sewage station to a flotation separation cavity (2);
and a third step of: starting an air supply device (8) to supply air to the first air floatation device (7-1) and the second air floatation device (7-2), wherein the air flow is set to be 0.5m 3 H-3 m 3 H;
fourth step: after the flotation separation cavity (2) of the sludge recovery activation treatment device is filled with sludge, continuously lifting the sludge and floating for 0.5-2 hours;
fifth step: stopping the sludge lifting pump (10), opening an eighth valve (22) and a ninth valve (24), closing the valve (12), discharging the sewage to the site sedimentation device, stopping the sewage discharge after the discharged liquid is clear, and closing the eighth valve (22) and the ninth valve (24);
sixth step: starting a sludge feeding pump (15), wherein the discharge capacity of the sludge feeding pump (15) is matched with the discharge capacity (or self-pressure discharge capacity) of a sewage lifting pump in front of a site sedimentation device, and the sludge feeding concentration is 0.1% -1% relative to the sewage quantity (v/v);
seventh step: opening an outlet valve of a particle feeding pump (18), and starting the particle feeding pump (18) to feed the sludge modification treatment agent WGX-1, wherein the feeding concentration of the sludge modification treatment agent WGX-1 is 0.1% -5% relative to the feeding amount (m/v) of the sludge;
eighth step: stopping adding coagulant aid by using the original flow adding device, adding flocculant, and controlling the adding amount to be 0.5-3 mg/L relative to the sewage; continuously adding coagulant, bactericide, corrosion inhibitor and scale inhibitor by using an original process dosing device, and properly reducing the adding concentration according to the filtered water property;
ninth step: the addition amount of the sludge reaches the required value V Throwing in Then, the sludge lifting pump (10) is stopped, the fourth valve (13) is closed, the third valve (12) is opened, the second valve (11) is opened, the eighth valve (22) is opened, the sludge of the sedimentation device in the field sewage treatment process flow enters the sludge recovery activation treatment device, and the third valve (12) is regulated and controlled, so that the sludge amount in the sludge recovery activation treatment device is maintained at 2/3 of the total volume;
sludge addition amount V Throwing in Performing calculation according to (2)
V Throwing in ＝F 2 ×S Sinking and sinking (2)
S in Sinking and sinking Area m of the bottom of the settling tank 2
V Throwing in The sludge quantity m to be added 3
F 2 Coefficient of 0.05 to 0.3
Tenth step: the addition amount of the sludge reaches the required value V Throwing in Then, the adding concentration of the sludge modification treatment agent WGX-1 is reduced, the adding concentration of the sludge modification treatment agent WGX-1 is set to be 10 mg/L-200 mg/L relative to the adding amount of the sludge, the adding amount of the flocculant is further reduced, and the adding amount of the flocculant is set to be 0.1 mg/L-1 mg/L relative to the sewage;
eleventh step: adding sludge according to the sludge adding concentration of 0.2-0.4% relative to the sewage quantity (v/v); adding the sludge modifying treatment agent WGX-1 according to the adding concentration of the sludge modifying treatment agent WGX-1 of 20mg/L to 50mg/L relative to the adding amount of the sludge; adding flocculant according to the concentration of the flocculant of 0.2-0.5 mg/L relative to the sewage, and continuously running the sewage according to the unchanged concentration of coagulant, bactericide, corrosion inhibitor and scale inhibitor in the eighth step;
twelfth step: when the suspended matter content in the filtered sewage slightly exceeds the standard required value, the concentration of the sludge modification treatment agent WGX-1 is increased to 50 mg/L-200 mg/L relative to the sludge addition amount and added for 30 min-120 min, and the eleventh step of continuous operation is recovered; when the suspended matter content in the filtered sewage slightly exceeds the standard required value, the concentration of the sludge modification treatment agent WGX-1 is increased to 50 mg/L-200 mg/L relative to the sludge addition amount and added for 30 min-120 min, and the process returns to the eleventh step to be continuously carried out, and the process is repeatedly carried out in a circulating way;
the sludge modification treatment agent WGX-1 is powder, and the composition of the sludge modification treatment agent WGX-1 is a mixture of one or more of the following materials in different proportions according to the mass ratio: 0 to 100 percent of walnut shell powder, 0 to 100 percent of talcum powder, 0 to 100 percent of quartz sand powder, 0 to 100 percent of fly ash powder, 0 to 100 percent of mica powder, 0 to 100 percent of light calcium carbonate powder, 0 to 100 percent of heavy calcium carbonate powder, 0 to 100 percent of barite powder, 0 to 100 percent of other inert powder and the particle diameter of 50 to 2000 meshes.
2. A treatment method of an apparatus for purifying sewage by a sludge recovery activation treatment cycle according to claim 1, wherein,
and a third step of: the gas flow rate was set to 2.2m 3 H;
fourth step: lifting sludge and floating for 1 hour;
sixth step: starting a sludge feeding pump (15), wherein the discharge capacity of the sludge feeding pump (15) is matched with the discharge capacity (or self-pressure discharge capacity) of a sewage lifting pump in front of a site sedimentation device, and the sludge feeding concentration is optimally 0.2% -0.4%;
seventh step: the adding concentration of the sludge modification treatment agent WGX-1 is 1.5% -3% relative to the adding amount (m/v) of the sludge;
eighth step: adding flocculant, controlling the adding amount to be 1.0 mg/L-1.5 mg/L relative to the sewage amount
Ninth step: f (F) 2 The coefficient is 0.08 to 0.15
Tenth step: the adding concentration of the sludge modification treatment agent WGX-1 is set to be 20 mg/L-50 mg/L, the adding amount of the flocculant is further reduced, and the adding amount of the flocculant is set to be 0.2 mg/L-0.5 mg/L relative to the sewage;
twelfth step: the concentration of the sludge modification treatment agent WGX-1 is 50 mg/L-200 mg/L, and the sludge modification treatment agent is added for 40 min-50 min and then returns to the tenth step for continuous operation; when the content of suspended matters in the filtered sewage slightly exceeds the standard required value, the concentration of the sludge modification treatment agent WGX-1 is increased to 50 mg/L-200 mg/L, and the sludge modification treatment agent WGX-1 is recovered after being added for 40 min-50 min, and the recovery is continued to the tenth step, and the repeated circulation is carried out.
3. The method for treating a sewage treatment apparatus by a sludge recovery activation treatment cycle according to claim 1, wherein the sludge modifying treatment agent WGX-1 comprises: 30% of light calcium carbonate powder, 40% of fly ash powder, 30% of walnut shell powder, and the particle diameter is 1200-1500 meshes.
4. The method according to claim 1, wherein the volume of the flotation separation chamber (2) is larger than the volume of the sludge collection chamber (3), and the volumes of the flotation separation chamber (2) and the sludge collection chamber (3) are calculated according to (1)
V Floating cavity ＝F 1 ×V Collecting cavity (1)
V in Floating cavity Volume m of flotation separation chamber (2) 3
V Collecting cavity Volume m of sludge collection chamber (3) 3
F 1 The coefficient is preferably 1.5 to 4 and more preferably 1.5 to 2.5.
5. A treatment method of an apparatus for purifying sewage by a sludge recovery activation treatment cycle according to claim 1, wherein,the volume of the flotation separation cavity (2) is designed to be 0.3m 3 ～1m 3 ；F 1 The coefficient is 1.5-2.5.
6. The method for treating the sewage purifying device by the sludge recycling and activating treatment cycle according to claim 1, wherein the first air flotation device (7-1) and the second air flotation device (7-2) are membrane type microporous aerators, the diameter of each membrane type microporous aerator is 215mm, the first air flotation device (7-1) is arranged in the middle of the flotation separation cavity (2) and is uniformly distributed, and the second air flotation device (7-2) is arranged at the bottom of the sludge collection cavity (3) and is uniformly distributed.
7. The method for treating a device for purifying sewage by recycling sludge, activating treatment according to claim 1, wherein the outlet flange (5) is positioned more than 30mm higher than the inlet flange (4).
CN202011513452.1A 2020-12-17 2020-12-17 Device and method for recycling, activating and recycling sludge for purifying sewage Active CN112939263B (en)

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