CN110668605A - Thermal power plant wastewater treatment method - Google Patents
Thermal power plant wastewater treatment method Download PDFInfo
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- CN110668605A CN110668605A CN201911021022.5A CN201911021022A CN110668605A CN 110668605 A CN110668605 A CN 110668605A CN 201911021022 A CN201911021022 A CN 201911021022A CN 110668605 A CN110668605 A CN 110668605A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a thermal power plant wastewater treatment method, which comprises a wastewater gradient utilization method and a unorganized discharged wastewater source classification recycling method; the wastewater gradient utilization method comprises the following steps: the treated chemical wastewater is sent to a desulfurization process water tank, and water in the desulfurization process water tank is sent to a desulfurization absorption tower through a water pump; after being treated, the desulfurization wastewater is sent to a coal slime sedimentation tank and a three-level sedimentation tank of a coal slime water treatment system to be used as a water source of coal yard cleaning water; and treating the wastewater generated after the coal yard is cleaned and then discharging the wastewater. The wastewater treatment method provided by the invention classifies and recycles the inorganically discharged wastewater source, improves the utilization rate of water resources, reduces unnecessary waste, and accords with the current environmental protection concept; the treatment process of chemical wastewater, desulfurization wastewater and coal-containing wastewater is improved, wastewater zero discharge is realized through the cascade utilization of the wastewater, the whole treatment process is simple, and the equipment maintenance cost is low.
Description
Technical Field
The invention relates to a thermal power plant wastewater treatment method, in particular to gradient utilization of wastewater, and belongs to the technical field of wastewater treatment.
Background
With the deterioration of the environment and the improvement of the environmental protection consciousness, the call for zero discharge of waste water is rising day by day. The zero release is not the water that does not discharge, but does not discharge the harmful substance through the water to natural environment, and the water resource of power plant's plant use of production finally discharges the environment with the form of steam, perhaps reserves in the inside water circulating system of power plant, has improved water resource utilization ratio like this greatly, avoids natural environment to suffer the pollution of polluting the water simultaneously, guarantees resident water safety. From the perspective of sustainable development, water resources at present and later are always in a relatively deficient state, and zero discharge of sewage is a necessary trend of industrial development. The water resource shortage in China and the requirement on environmental protection are gradually improved, the water resource problem and the environmental problem faced by the power plant are increasingly prominent, the waste water treatment process and technology of the power plant are optimized, the waste water recycling is realized, and the significance of the social benefit and the economic benefit is very far.
The existing mature reclaimed water reuse technology generally combines the traditional technology and the membrane technology, and the treatment process is as follows: the method is characterized in that a suspended growth bioreactor and an ultrafiltration membrane separation system are integrated based on immersion type high-strength hollow fiber membrane separation and biological reaction technology, and a secondary sedimentation tank and a sand filtration system in the traditional activated sludge treatment system are replaced by an ultrafiltration membrane separation method. It is characterized in that the effluent water quality is good, the suspended solid, CODcr, NH3-N, BOD5 and turbidity are low, and the effluent water can be directly reused as industrial water; but the investment cost is high, and a special membrane treatment plant needs to be built, because the wastewater quality is poor, the membrane is easy to block, the operation period is short, the membrane cleaning cost is high, the quality of the power plant desulfurization and coal plant wastewater is extremely poor, and if the wastewater is directly filtered without any treatment, the blockage, scaling and corrosion of a permeable membrane are easily caused.
Disclosure of Invention
The purpose is as follows: the invention provides a method for treating waste water of a thermal power plant, aiming at overcoming the defects in the prior art.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a thermal power plant wastewater treatment method comprises a wastewater gradient utilization method and a classified recycling method of unorganized discharged wastewater sources;
the wastewater gradient utilization method comprises the following steps:
the treated chemical wastewater is sent to a desulfurization process water tank, and water in the desulfurization process water tank is sent to a desulfurization absorption tower through a water pump; after being treated, the desulfurization wastewater is sent to a coal slime sedimentation tank and a three-level sedimentation tank of a coal slime water treatment system to be used as a water source of coal yard cleaning water; and the wastewater generated after the coal yard is cleaned is treated and then recycled and enters the wastewater gradient utilization system again.
Further, the inorganization waste water source comprises circulating pump room rotary filter screen flushing water, sludge sedimentation tank overflow water, sump drainage, domestic sewage overflow water, air compressor drainage, auxiliary machine cooling water in a desulfurization area and chemical sampling room drainage.
Further, the treatment process for each of the sources of unorganized wastewater discharge is as follows:
directly recycling flushing water of a rotary filter screen of the circulating pump room to a front pool of a circulating pump inlet;
treating overflow water of the sludge sedimentation tank as wastewater;
the sump drain is treated as a second type of wastewater;
the overflow water of the domestic sewage is recycled to the waste water storage tank for buffering;
the water drained by the air compressor is recovered to a coal yard and is filtered by a coal pile for incineration;
cooling water of an auxiliary machine in a desulfurization area is recycled to a desulfurization process water tank;
and (3) draining between chemical sampling rooms, comprising purified water and chemical water adding, wherein the purified water is recovered to a sealed water tank, the chemical water adding is recovered to a unit drainage tank, and then the chemical wastewater is discharged.
Further, the desulfurization wastewater treatment process comprises the following steps: the process comprises the steps of overflowing the desulfurization waste water yeast gypsum cyclone, collecting waste water into a waste water collecting tank, pumping water of the waste water collecting tank into the waste water cyclone through a waste water cyclone pump, returning limestone slurry to an underflow, overflowing into a waste water tank into a waste water collecting pool, pumping water of the waste water collecting pool into a triple box through a waste water lifting pump for treatment, wherein the triple box comprises a neutralization box, a settling box and a flocculation box, adding an inorganic efficient adsorbent into the flocculation box for treatment, overflowing treated water into a clarification tank, overflowing into a water outlet box after precipitation, and transferring into a coal yard for comprehensive utilization.
Furthermore, stirrers with the speed of more than 120r/min are arranged in the settling tank and the flocculation tank, and a water washing and pneumatic stirring device is added in the clarification tank.
Further, the coal-containing wastewater treatment process comprises adsorption, dosing flocculation, precipitation and filtration, wherein the adsorption adopts natural adsorption of raw coal, the precipitation adopts a step-by-step natural sedimentation mode, and the precipitation tank comprises a primary precipitation tank, a secondary precipitation tank and a tertiary precipitation tank; the dosing pipeline extends to the outlet of the lift pump of the primary sedimentation tank.
Has the advantages that: the method for treating the waste water of the thermal power plant, provided by the invention, aims at the problem of extensive drainage of a water purification system, a circulating water system and the like in the prior art, provides classification recycling of an unorganized discharged waste water source, improves the utilization rate of water resources, reduces unnecessary waste, and accords with the current environmental protection concept; the treatment process of chemical wastewater, desulfurization wastewater and coal-containing wastewater is improved, wastewater zero discharge is realized through the cascade utilization of the wastewater, the whole treatment process is simple, and the equipment maintenance cost is low.
Drawings
FIG. 1 is a schematic flow diagram of the wastewater cascade treatment of the present invention.
Detailed Description
The present invention will be further described below.
A thermal power plant wastewater treatment method comprises a wastewater gradient utilization method and an unorganized discharged wastewater source classification recycling method.
The inorganization waste water source comprises circulating pump room rotary filter screen flushing water, sludge sedimentation tank overflow water, sump drainage, domestic sewage overflow water, air compressor drainage, cooling water of auxiliary machines in a desulfurization area and chemical sampling room drainage. The recovery treatment method of each unorganized discharged wastewater source comprises the following steps:
(1) the circulating pump room rotates the filter screen to wash water, the amount is large, and the water quality is close to the raw water, directly recycle it to the circulating pump inlet forebay, isolate the drainage ditch to the rainwater system;
(2) the overflow water of the sludge sedimentation tank contains much sludge and can be used as wastewater for treatment;
(3) draining water from a water collecting pit, wherein the drained water of a wastewater acid-base dosing pit pump and a wastewater chemical acid-base dosing pit pump contains substances such as acid and base and is treated as second-class wastewater;
(4) the domestic sewage overflow water has high organic matter content and is recycled to the #5 wastewater storage tank for buffering;
(5) the air compressor is hydrophobic, contains oil and has poor water quality, and the water is recycled to a special water storage tank of the coal yard, sprayed to a coal pile through a pump and filtered for incineration;
(6) cooling water of an auxiliary machine in a desulfurization area is recycled to a desulfurization process water tank through an industrial water belt and is conveyed to a chemical recovery water tank through a pump;
(7) drainage between chemical sampling, quality of water is various, divides into pure water and adds liquid medicine according to quality of water, and the pure water is retrieved to sealed water tank and is carried to the unit condenser again, adds the liquid medicine and retrieves and carry to unit drainage tank to regeneration waste liquid pond again.
In the prior art, the inorganically discharged wastewater sources are all directly discharged to a rainwater well, wherein part of the wastewater sources, such as flushing water of a rotary filter screen of a circulating pump room, purified water discharged from a chemical sampling room and the like, can be recycled and directly discharged to cause waste; and part of waste water sources such as sump drainage, air compressor drainage, liquid medicine adding and the like discharged from a chemical sampling room contain harmful substances, and the direct discharge can increase the environmental pollution. The invention carries out classification and recovery treatment according to different waste water sources and respective characteristics, improves the utilization rate of water sources and saves the cost.
As shown in fig. 1, the wastewater cascade utilization method comprises the following processes:
the treated chemical wastewater is sent to a desulfurization process water tank, and the flow rate is 80-100 tons/hour; conveying water in the desulfurization process water tank to a desulfurization absorption tower through a water pump, wherein the outlet pressure of the water pump is 0.6Mpa, and the water is replenished to the absorption tower by 80-100 tons per hour; after being treated, the desulfurization wastewater is sent to a coal slime sedimentation tank and a three-level sedimentation tank of a coal slime water treatment system to be used as a water source of coal yard cleaning water; and the wastewater generated after the coal yard is cleaned is treated and then recycled to the wastewater storage tank, and enters the wastewater gradient utilization system again.
Chemical waste water collects and carries out desliming to the higher chemical waste water of mud content before the waste water reservoir to improve desliming device, specifically, increase the homogeneity pond system between sludge concentration tank to sludge dewaterer, and add the dilution stirring of water, can stabilize the muddy water concentration who enters into centrifugal sludge dewaterer, effectively prevent that the unsatisfactory or excessive thick hydroextractor of rare desliming from transshipping the problem appearance.
The desulfurization wastewater treatment process comprises the following steps: the process comprises the steps of overflowing the desulfurization waste water yeast gypsum cyclone, collecting waste water into a waste water collecting tank, pumping water of the waste water collecting tank into the waste water cyclone through a waste water cyclone pump, returning limestone slurry to an underflow, overflowing into a waste water tank into a waste water collecting pool, pumping water of the waste water collecting pool into a triple box through a waste water lifting pump for treatment, wherein the triple box comprises a neutralization box, a settling box and a flocculation box, adding an inorganic efficient adsorbent into the flocculation box for treatment, overflowing treated water into a clarification tank, overflowing into a water outlet box after precipitation, and transferring into a coal yard for comprehensive utilization. The settling tank and the flocculation tank are internally provided with stirrers with the speed of more than 120r/min, and a water washing and pneumatic stirring device is added in the clarification tank.
Five traditional Chinese medicines need to be added when the existing desulfurization wastewater treatment system operates, the process is complex, more equipment is needed, and the operation of the whole wastewater system is influenced when a certain medicine adding system fails; the improved desulfurization wastewater system is adopted, only one agent of the efficient inorganic adsorbent is added with water dream, and only one dry type chemical adding machine is additionally arranged at the upper part of the settling tank; the modified dosing system has the advantages of simple addition process, convenience in adjustment, small dosing amount, wide wastewater treatment range and labor and equipment maintenance cost saving.
The coal-containing wastewater treatment process comprises adsorption, dosing flocculation, precipitation and filtration, wherein the adsorption adopts natural adsorption of raw coal, the precipitation adopts a step-by-step natural sedimentation mode, and the precipitation tank comprises a primary precipitation tank, a secondary precipitation tank and a tertiary precipitation tank; the dosing pipeline extends to the outlet of the lift pump of the primary sedimentation tank. The self-priming pump of the flushing water in the coal-containing wastewater treatment system is changed into a variable-frequency centrifugal pump, so that the wastewater is recycled, and the coal-containing wastewater treatment system can continuously and stably operate.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A thermal power plant wastewater treatment method is characterized in that: comprises a waste water cascade utilization method and a method for classifying, recycling and utilizing unorganized discharged waste water sources;
the wastewater gradient utilization method comprises the following steps:
the treated chemical wastewater is sent to a desulfurization process water tank, and water in the desulfurization process water tank is sent to a desulfurization absorption tower through a water pump; after being treated, the desulfurization wastewater is sent to a coal slime sedimentation tank and a three-level sedimentation tank of a coal slime water treatment system to be used as a water source of coal yard cleaning water; and the wastewater generated after the coal yard is cleaned is treated and then recycled and enters the wastewater gradient utilization system again.
2. The thermal power plant wastewater treatment system according to claim 1, characterized in that: the inorganization waste water source comprises circulating pump room rotary filter screen flushing water, sludge sedimentation tank overflow water, sump drainage, domestic sewage overflow water, air compressor drainage, cooling water of auxiliary machines in a desulfurization area and chemical sampling room drainage.
3. The thermal power plant wastewater treatment system according to claim 2, characterized in that: the treatment process for each of the unorganized sources of wastewater was as follows:
directly recycling flushing water of a rotary filter screen of the circulating pump room to a front pool of a circulating pump inlet;
treating overflow water of the sludge sedimentation tank as wastewater;
the sump drain is treated as a second type of wastewater;
the overflow water of the domestic sewage is recycled to the waste water storage tank for buffering;
the water drained by the air compressor is recovered to a coal yard and is filtered by a coal pile for incineration;
cooling water of an auxiliary machine in a desulfurization area is recycled to a desulfurization process water tank;
and (3) draining between chemical sampling rooms, comprising purified water and chemical water adding, wherein the purified water is recovered to a sealed water tank, the chemical water adding is recovered to a unit drainage tank, and then the chemical wastewater is discharged.
4. The thermal power plant wastewater treatment system according to claim 1, characterized in that: the desulfurization wastewater treatment process comprises the following steps: the process comprises the steps of overflowing the desulfurization waste water yeast gypsum cyclone, collecting waste water into a waste water collecting tank, pumping water of the waste water collecting tank into the waste water cyclone through a waste water cyclone pump, returning limestone slurry to an underflow, overflowing into a waste water tank into a waste water collecting pool, pumping water of the waste water collecting pool into a triple box through a waste water lifting pump for treatment, wherein the triple box comprises a neutralization box, a settling box and a flocculation box, adding an inorganic efficient adsorbent into the flocculation box for treatment, overflowing treated water into a clarification tank, overflowing into a water outlet box after precipitation, and transferring into a coal yard for comprehensive utilization.
5. The thermal power plant wastewater treatment system according to claim 4, characterized in that: the settling tank and the flocculation tank are internally provided with stirrers with the speed of more than 120r/min, and a water washing and pneumatic stirring device is added in the clarification tank.
6. The thermal power plant wastewater treatment system according to claim 1, characterized in that: the coal-containing wastewater treatment process comprises adsorption, dosing flocculation, precipitation and filtration, wherein the adsorption adopts natural adsorption of raw coal, the precipitation adopts a step-by-step natural sedimentation mode, and the precipitation tank comprises a primary precipitation tank, a secondary precipitation tank and a tertiary precipitation tank; the dosing pipeline extends to the outlet of the lift pump of the primary sedimentation tank.
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| CN201911021022.5A CN110668605A (en) | 2019-10-25 | 2019-10-25 | Thermal power plant wastewater treatment method |
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| CN201911021022.5A CN110668605A (en) | 2019-10-25 | 2019-10-25 | Thermal power plant wastewater treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111612678A (en) * | 2020-05-28 | 2020-09-01 | 重庆工商大学 | Method for realizing sewage management cloud platform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130036953A1 (en) * | 2011-08-12 | 2013-02-14 | Babcock-Hitachi Kabushiki Kaisha | Wet Type Flue-Gas Desulfurization Apparatus and Thermal Power Plant Having the Same |
| CN103058408A (en) * | 2011-10-20 | 2013-04-24 | 山西安泰集团股份有限公司 | Recovery treatment method and treatment recycling system of power generation industrial wastewater |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
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2019
- 2019-10-25 CN CN201911021022.5A patent/CN110668605A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130036953A1 (en) * | 2011-08-12 | 2013-02-14 | Babcock-Hitachi Kabushiki Kaisha | Wet Type Flue-Gas Desulfurization Apparatus and Thermal Power Plant Having the Same |
| CN103058408A (en) * | 2011-10-20 | 2013-04-24 | 山西安泰集团股份有限公司 | Recovery treatment method and treatment recycling system of power generation industrial wastewater |
| CN103351066A (en) * | 2013-07-22 | 2013-10-16 | 中国大唐集团环境技术有限公司 | Novel wet flue gas desulfurization wastewater treatment method and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111612678A (en) * | 2020-05-28 | 2020-09-01 | 重庆工商大学 | Method for realizing sewage management cloud platform |
| CN111612678B (en) * | 2020-05-28 | 2023-06-09 | 重庆工商大学 | Implementation method of sewage management cloud platform |
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