LU503889B1 - A desulfurization wastewater treatment system and process - Google Patents
A desulfurization wastewater treatment system and process Download PDFInfo
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- LU503889B1 LU503889B1 LU503889A LU503889A LU503889B1 LU 503889 B1 LU503889 B1 LU 503889B1 LU 503889 A LU503889 A LU 503889A LU 503889 A LU503889 A LU 503889A LU 503889 B1 LU503889 B1 LU 503889B1
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 title claims description 3
- 230000023556 desulfurization Effects 0.000 title claims description 3
- 239000002351 wastewater Substances 0.000 claims abstract description 108
- 239000010802 sludge Substances 0.000 claims abstract description 96
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 238000005352 clarification Methods 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 11
- 239000000701 coagulant Substances 0.000 claims description 11
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 11
- 238000005273 aeration Methods 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 238000011001 backwashing Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000005189 flocculation Methods 0.000 claims description 7
- 230000016615 flocculation Effects 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000008267 milk Substances 0.000 claims description 6
- 210000004080 milk Anatomy 0.000 claims description 6
- 235000013336 milk Nutrition 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005864 Sulphur Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 230000032258 transport Effects 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003830 anthracite Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 125000001741 organic sulfur group Chemical group 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims 1
- 230000003472 neutralizing effect Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 5
- 238000009418 renovation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
-
- 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
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The application discloses a desulphurisation wastewater treatment system and process, said system comprises: a DCS control system and a wastewater buffer tank, said wastewater buffer tank is connected to a triple tank system, a clarifier, a neutralisation tank and a filtration system in turn through pipes; said process comprises: wastewater treatment, sedimentation treatment, clarification treatment, neutralisation treatment, filtration treatment and sludge dewatering treatment. The application improves the quality of treated desulphurisation wastewater, incorporates a DCS control system to control the dosing of the system, automates the dosing and improves the precise control of the dosing quantity, and is able to monitor the data of each component of the system.
Description
A desulfurization wastewater treatment system and process
The present invention relates to a treatment process and relates to the technical field of wastewater treatment, in particular to a desulphurisation wastewater treatment system and process.
Background technology
Coal-fired power generation has long been a major source of energy supply in China due to the country's abundant coal resources and the reliable and mature operation of coal-fired power generation technology. However, the operation of coal-fired power plants produces a variety of wastewater, including desulphurisation wastewater, circulating cooling system effluent, acid and alkaline wastewater and domestic sewage.
Desulphurisation wastewater is one of the most difficult wastewaters to treat in coal-fired power plants due to its complex composition and variety of pollutants. Desulphurisation wastewater is produced in the wet flue gas desulphurisation system and is weakly acidic, containing a large number of salts and heavy metal ions. The main substances targeted by the desulphurisation wastewater treatment device are heavy metal ions, fluoride and suspended matter, etc. At present, the triplex tank process is generally used, i.e. the neutralisation tank, sedimentation tank and coagulation tank are used for PH adjustment, heavy metal ion reaction and coagulation respectively before entering the clarification thickener for clarification treatment, the treated clear water is discharged and the resulting sludge is sent to the dewatering system for dewatering treatment. Due to the short reaction stay time of the desulphurisation system triplex tank and clarifier design, the flocculation reaction is poor, resulting in poor sludge separation, high turbidity and suspended matter content of the effluent, poor water body, as well as the internal tank and pipes are prone to corrosion after a long time of immersion in acid and alkaline wastewater.
The renovation project of the FGD wastewater standard treatment system in this application still adopts the existing triple tank treatment process and the design wastewater treatment capacity is 14m? /h. Through the renovation of some equipment in the system, the quality of the treated FGD wastewater is improved and it can solve the problem of realizing the automatic control of the system and getting the feedback of the status of the system components in time.
The present application provides a desulphurisation wastewater treatment system and process to solve a technical problem in the prior art.
A desulphurisation wastewater treatment system comprising a DCS control system andl4/503889 wastewater buffer tank, said wastewater buffer tank being connected to a triplex tank system, a clarifier, a neutralisation tank and a filtration system in turn via piping, said clarifier being connected to a sludge dewatering system at one end via piping, said sludge dewatering system being connected to the wastewater buffer tank at the other end via piping, said filtration system being connected to the wastewater buffer tank via piping. specifically, said wastewater buffer tank is provided with an aeration fan and a flow meter; said wastewater buffer tank and the tank and pipes in the triplex tank system are protected by paint, said triplex tank system is provided with a dosing tank, a pressure gauge, and a pH meter; said clarifier is provided with a pressure gauge; said neutralization tank is provided with a pH meter said filtration system is provided with a dual media filter and said filtration system is provided with a turbidity meter in the outlet pipe said sludge dewatering system comprises a sludge buffer tank and a sludge dewatering machine, said sludge buffer tank and sludge dewatering machine are connected in turn by pipes, said sludge buffer tank is provided with a sludge mixing pump and a sludge transfer pump, said sludge buffer tank and sludge dewatering machine are provided with a mud level meter respectively.
Specifically, said DCS control system is used to achieve program control of the process system equipment, with LED and keypad as monitoring and control means, to complete the collection, processing and recording of data information on the flow meter, pressure meter, pH meter, turbidity meter and mud level meter, to alarm and automatically print abnormal working conditions and to precisely control the dosing of the dosing tank; wherein the DCS system monitors the flow meter and pH meter in said wastewater buffer tank and the triple tank system, and controls the amount of sodium hypochlorite added to the dosing tank in the wastewater buffer tank according to the values of the flow meter and pH meter in the wastewater buffer tank; controls the dosing tank in the triple tank system according to the values of the flow meter and pH meter in the triple tank system to add in turn lime milk, poly iron, organic sulfur and coagulant for neutralization, precipitation and flocculation; according to the value displayed by the pH meter in the neutralization tank, control the addition of sodium hypochlorite to the dosing tank in the neutralization tank to adjust the pH value and control the pH value of the wastewater at 9-11; according to the value of the turbidity meter on the outlet pipe of said filtration system to judge, when the differential pressure between the import and export of the filtration system or the working time reaches the set value, the control system starts backwashing.
Specifically, said aeration fan provided in the wastewater buffer tank is connected to a pipe, which is connected to the bottom of the wastewater buffer tank through said pipe, sald/503889 aeration fan drums gas into the wastewater buffer tank, which is used to provide sufficient oxygen to neutralise the wastewater.
Specifically, the tank and pipes in said wastewater buffer tank triplex system are coated with ZS-1034 acid and alkali resistant anti-corrosion coating on the inner walls of the tank and pipes for preventing physical and chemical reactions to acid and alkali corrosive media.
Specifically, said clarifier is used to discharge the sludge from the wastewater by settling it into a sludge buffer tank, which in turn conveys the wastewater to the neutralisation tank.
Specifically, said neutralisation tank is used to dose the wastewater to adjust the pH of the wastewater to 9-11.
Specifically, said dual media filter in said filtration system uses a multi-layer filter media of anthracite and quartz sand for ensuring that when the wastewater passes through the filter layer, the suspended matter is largely intercepted and adsorbed, enhancing the quality of the effluent; wherein said turbidity meter fitted to the outlet pipe of the filtration system is used for the DCS system to judge according to the value of the turbidity meter, and when the differential pressure between the inlet and outlet of the filtration system or the working time reaches the set value, the system starts backwashing to ensure that the filter media is clean and effective.
Specifically, said sludge dewatering system is used for dewatering the sludge settled in the clarifier, transporting the water in the sludge to the wastewater buffer tank and discharging the treated absolute dry sludge; wherein said sludge mixing pump in said sludge buffer tank is used for mixing the sludge evenly and said sludge transfer pump is used for accelerating the transport of the sludge to the sludge dewatering machine; said sludge dewatering machine uses a plate and frame filter press for filtering out the sludge from the wastewater The filtered wastewater is piped into said wastewater buffer tank and the sludge is discharged as sludge cake.
A desulphurisation wastewater treatment process comprising wastewater treatment, sedimentation treatment, clarification treatment, neutralisation treatment, filtration treatment and sludge dewatering treatment, said process specifically comprising:
Wastewater treatment: addition of sodium hypochlorite for the decomposition of organic COD in the wastewater as well as the destruction of heavy metal ion complexes, which are fully reflected into the triplex tank;
Sedimentation treatment: after wastewater treatment, the wastewater goes to the triplex tank, where lime milk, poly iron, organic sulphur and coagulant are added to the dosirk#503889 tank according to the control of the DCS control system for neutralization, sedimentation and flocculation, which is fully reflected and then enters the clarifier;
Clarification: the wastewater from the sedimentation process is fed into the clarifier, so that the larger suspended particles in the wastewater precipitate down into the sludge buffer tank and the wastewater goes into the neutralisation tank;
Neutralisation treatment: the clarified wastewater enters the neutralisation tank and the pH of the wastewater is adjusted to 9-11 by controlling the dosing according to the DCS control system;
Filtration: After neutralisation, the wastewater enters the double media filter to filter and remove solids and flocs in the water as well as residual impurities in the wastewater; when the differential pressure between the import and export of the filter system or the working time reaches a set value, the system starts backwashing to ensure that the filter media is clean and effective.
Wastewater desliming treatment: according to the clarifier treated sludge enters into the sludge buffer tank with sufficient agitation, enters into the sludge dewatering machine through the sludge transfer pump, discharges the absolutely dry sludge after dehydration, and then transports the separated filtrate into the wastewater buffer tank.
The application improves the quality of treated FGD wastewater by adding facilities such as aeration fans in the wastewater buffer tank, double media filters and plate and frame filter presses, and adds a DCS control system to control the system dosing, which automates the dosing and improves the precise control of the dosing amount, as well as being able to monitor the data of each component in the system and get timely feedback on the status of the FGD wastewater system.
Description of attached figures
In order to illustrate more clearly the technical solutions in the example of the present application, the following is a brief description of the accompanying drawings to be used in the description of the example , which are obviously only some of the example of the present application and from which other drawings can be obtained without creative work by those skilled in the art.
Figure 1 illustrates a knotted sketch of a desulphurization wastewater treatment system;
Figure 2 illustrates an overall flow diagram of a desulphurization wastewater treatment process;
Wherein, wastewater buffer tank 1, triplex tank 2 clarifier 3, neutralisation tank 4, dual media filter 5, sludge buffer tank 6, sludge dewaterer 7. LU503889
Specific embodiments
The technical solutions in the example of this application will be clearly and completely described below in conjunction with the accompanying drawings in the example of this 5 application. Obviously, the example described are only a part of the example of this application, and not all of them. Based on the example in this application, all other example obtained without creative labour by a person of ordinary skill in the art fall within the scope of protection of this application.
Many specific details are set out in the following description to facilitate a full understanding of the application, but the application may be implemented in other ways than those described herein, and similar extensions may be made by those skilled in the art without being inconsistent with the application, so that the application is not limited by the specific example disclosed below.
Example of implementation I:
Considering the uncertainty of the incoming FGD wastewater and the safety and reliability of the system, the selection of all equipment for FGD wastewater renovation and addition should be designed according to 14m? /h.
A desulphurisation wastewater treatment system comprising a DCS control system and a wastewater buffer tank 1, said wastewater buffer tank 1 being connected to a triplex tank system 2, a clarifier 3, a neutralisation tank 4 and a filtration system in turn via pipes, said clarifier 3 being connected to a sludge dewatering system at one end via a pipe, said sludge dewatering system being connected to the wastewater buffer tank 1 at the other end via a pipe, said filtration system being connected to the wastewater buffer tank 1 via said filtration system is connected to the wastewater buffer tank 1 via piping.
Specifically, said wastewater buffer tank 1 is provided with an aeration fan and a flow meter; said wastewater buffer tank 1 and the tank and pipes in the triplex tank system 2 are protected by paint, said triplex tank system 2 is provided with a dosing tank, a pressure gauge, and a pH meter; said clarifier 3 is provided with a pressure gauge; said neutralization tank 4 is provided with a pH meter said filtration system is provided with a dual media filter 5, and said filtration system is provided with a turbidity meter in the outlet pipe at said sludge dewatering system comprises a sludge buffer tank 6 and a sludge dewatering machine 7, said sludge buffer tank 6 and sludge dewatering machine 7 are connected in turn by pipes, said sludge buffer tank 6 is provided with a sludge mixing pump and a sludge transfer pump, said sludge buffer tank 6 and sludge dewatering machine 7 are provided with a mud level meter respectively. LU503889 specifically, said DCS control system is used to realize program control of the process system equipment, using LED and keypad as monitoring and control means, completing the collection, processing and recording of data information on the flow meter, pressure meter, pH meter, turbidity meter, mud level meter, alarming and automatic printing of abnormal working conditions as well as precise control of the dosage of dosing of the dosing tank;
Wherein, when the DCS, by monitoring the flow meter and pH meter in said wastewater buffer tank 1 and the triplex tank system 2, determines the dosage to be added according to the values of the flow meter and pH meter in the wastewater buffer tank 1, and controls the dosing tank in the wastewater buffer tank 1 to add sodium hypochlorite; according to the values of the flow meter and pH meter in the triplex tank system 2, determines the dosage to be added, and controls the dosing tank in the triplex tank system 2 to sequentially add lime milk, poly iron, organic sulphur and coagulant for neutralisation, precipitation and flocculation; according to the value displayed by the pH meter in the neutralisation tank 4, control the dosing tank in the neutralisation tank 4 to add sodium hypochlorite to adjust the pH value and control the pH value of the waste water at 9-11; judge according to the value of the turbidity meter on the outlet pipe of the said filtration system, when the differential pressure between the inlet and outlet of the filtration system or the working time reaches the set value, the system starts backwashing to ensure that the filter media is clean and effective.
The following table shows the main equipment specifications for the FGD wastewater treatment system renovation project (all equipment at least but not limited to, subject to meeting all the functions of the project as listed in the technical specifications). 1) Wastewater buffer tank 200m’ 8mx8mx3.5m, with top cover,
Volume reinforced all around, thickness not less than 12mm pon ee
Anti-corrosion mm
Other meter 2) Aeration fans 3) Motor power/protection class/insulation class 3) Dual media filters bums
4) Sludge buffer tanks
5) Filter backwash pumps en” m
Contact medium wastewater treatment 6) Sludge mixing pumps 7) Sludge transfer pumps
8) Plate and frame filter presses pistons |p m m
Material of overflow parts polypropylene
In order to monitor water quality and control operation, the system is equipped with necessary monitoring instruments such as flow meter, thermometer, pressure meter, pH meter,
turbidity meter, mud level meter, etc. This application uses a set of DCS control system, thé/503889 control system to achieve program control of the process system equipment, LED and keyboard as a means of monitoring and control, complete the collection of system information, processing and recording, alarm and automatic printing of abnormal working conditions, automatic, semi-automatic, in situ manual and control room keyboard microcomputer operation.
Example of implementation II:
A process for treating desulphurization wastewater, said process specifically comprising:
Step S101 Wastewater treatment: addition of sodium hypochlorite for decomposing the organic COD in the wastewater as well as for destroying the complexes of heavy metal ions, which are fully reflected into the triplex tank, wherein said device for adding sodium hypochlorite is specified as follows: 1) Sodium hypochlorite dosing unit en ne
Installation conditions tank mann | SST 5) Materials of construction
Smm thick
Magnetic flaps / float material / production plant) 2 units pumps
2 units pumps
Step S102 Sedimentation treatment: After wastewater treatment, the wastewater goes to the triplex tank, where the dosing tank is controlled according to the DCS control system to add lime milk, poly iron, organic sulphur and coagulant for neutralization, sedimentation and flocculation, which is fully reflected and then enters the clarifier;
Specifically, said coagulant aid dosing device uses a 4% liquid coagulant stock solution, the specific coagulant aid device being specified as follows: 2) Coagulant aid device mea en
Installation conditions tank
RTE
Step S103 Clarification: the wastewater from the sedimentation process enters the clarifier, where the larger suspended particles in the wastewater settle out to form sludge in the sludge buffer tank and the wastewater enters the neutralisation tank;
Step S104 Neutralisation: the clarified wastewater is fed into the neutralisation tank for dosing to adjust the pH of the wastewater to 9 - 11;
Step S105 Filtration: The neutralised wastewater enters the dual media filter for filtration to remove solids and flocs in the water and residual impurities in the wastewater, when the differential pressure between the inlet and outlet of the filtration system or the working time reaches a set value, the system starts backwashing to ensure that the filter media is clean and effective;
Step S106 Wastewater desludging treatment: The sludge treated according to the clarifier is fed into the sludge buffer tank with sufficient agitation, and through the sludge transfer pump into the sludge dewatering machine, where the absolutely dry sludge after dewatering is discharged, and the separated filtrate is then transported to the wastewater buffer tank. wherein the specific chemical composition of the drug used in said process is shown in the following table:
Table of chemical specification parameters
Configuratio
Serial Chemical |Concentratio n Dosing
Name number composition | n (purity) |concentratio| amount n
Polymerised Determined 1 Flocculants ferric 10% by sulphate commissioni
. LU503889
Coagulant |Polyacrylami ng 2 Solids 0.05% aid de
Hydrochloric
HCI 31% acid
Organosulph
TMT-15 15% ur
Claims (10)
1. A desulphurisation wastewater treatment system comprising a DCS control system and a wastewater buffer tank, said wastewater buffer tank being connected to a triplex tank system, a clarifier, a neutralisation tank and a filtration system in turn by pipes, said clarifier being connected to a sludge dewatering system at one end by pipes, said sludge dewatering system being connected to a wastewater buffer tank at the other end by pipes, said filtration system being connected to a wastewater buffer tank by pipes, characterised by in that said wastewater buffer tank is provided with an aeration fan and a flow meter; said wastewater buffer tank and triplex tank system are protected by coatings on the tank and pipes, and said wastewater buffer tank and triplex tank system are provided with a dosing tank, a flow meter and a pH meter; said clarifier is provided with a flow meter and a pressure meter; said neutralization tank is provided with a dosing tank and a pH meter; said filtration system is provided with a dual media filter, and said said filter system is equipped with a turbidity meter at the outlet pipe of the filter system; said sludge dewatering system includes a sludge buffer tank and a sludge dewatering machine, said sludge buffer tank and sludge dewatering machine are connected in turn by pipes, said sludge buffer tank is equipped with a sludge mixing pump and a sludge transfer pump, said sludge buffer tank and sludge dewatering machine are equipped with a pressure gauge and a mud level meter respectively.
2. A desulphurization wastewater treatment system as claimed in claim 1, wherein said aeration fan provided in said wastewater buffer tank is connected to a pipe, which is connected to the bottom of the wastewater buffer tank through said pipe, said aeration fan drums gas into the wastewater buffer tank for neutralizing and providing sufficient oxygen to the wastewater.
3. A desulphurization wastewater treatment system as claimed in claim 1, wherein said wastewater buffer tank triple tank system in which the tank and pipes are coated with ZS-1034 acid and alkali resistant anti-corrosion coating on the inner wall of the tank and pipes for preventing physical and chemical reactions of acid and alkali corrosive media.
4. A desulphurization wastewater treatment system as claimed in claim 1, wherein said dual media filter uses a multi-layer filter media of anthracite and quartz sand for ensuring that when the wastewater passes through the filter layer, the suspended matter is substantially intercepted and adsorbed, enhancing the water quality of the effluent.
5. A desulphurization wastewater treatment system as claimed in claim 1, wherein said turbidity meter fitted to the outlet pipe of the filtration system is used for the DCS system to determine, based on the value of the turbidity meter, that when the differential pressure between the inlet and outlet of the filtration system or the working time reachesld/503889 set value, the system starts backwashing to ensure that the filter media is clean and effective.
6. A desulphurization wastewater treatment system as claimed in claim 1, wherein said filtration system is connected to the wastewater buffer tank by piping and said filter backwash pump is installed at the mouth of the filtration system piping for powering the system backwash.
7. A desulphurization wastewater treatment system as claimed in claim 1, wherein said sludge mixing pump in said sludge buffer tank is placed in the centre of the sludge buffer tank for homogenizing and mixing the sludge in said sludge buffer tank to prevent sludge deposition in the tank; said sludge transfer pump is placed at the outlet of the sludge buffer tank discharge pipe for accelerating the discharge of sludge to a sludge dewatering machine.
8. A desulphurization wastewater treatment system as claimed in claim 1, wherein said sludge dewatering machine is a plate and frame filter press for filtering out the sludge from the wastewater, and the filtered wastewater is piped into said wastewater buffer tank and the sludge is discharged as sludge cake.
9. A desulfurization wastewater treatment system as claimed in claim 1, wherein said DCS control system controls the amount of sodium hypochlorite added to the dosing tank in the wastewater buffer tank according to the value of the flow meter and pH meter in the wastewater buffer tank; controls the dosing tank in the triple tank system according to the value of the flow meter and pH meter in the triple tank system to add lime milk, poly iron, organic sulfur and coagulant in turn for neutralization, precipitation and flocculation amount; according to the value displayed by the pH meter in the neutralisation tank, control the addition of sodium hypochlorite to the dosing tank in the neutralisation tank to adjust the pH value and control the pH value of the waste water at 9-11; according to the value of the turbidity meter on the discharge pipe of said filtration system, judge, when the differential pressure between the import and export of the filtration system or the working time reaches the set value, the control system starts backwashing.
10. A desulphurisation wastewater treatment process comprising wastewater treatment, sedimentation treatment, clarification treatment, neutralisation treatment, filtration treatment and sludge dewatering treatment, characterised in that said process specifically comprises: (1) Wastewater treatment: addition of sodium hypochlorite for decomposing organic
COD in the wastewater as well as for destroying the complexes of heavy metal ions, whid#}503889 are fully reflected into the triplex tank;
(2) Sedimentation treatment: after wastewater treatment, the wastewater goes to the triplex tank, where lime milk, poly iron, organic sulphur and coagulant are added to the dosing tank according to the control of the DCS control system for neutralization, sedimentation and flocculation, which is fully reflected and then enters the clarifier;
(3) Clarification treatment: the wastewater enters the clarifier after the sedimentation treatment, the larger suspended particles in the wastewater settle down in the vessel to form sludge into the sludge buffer tank and the wastewater enters the neutralisation tank;
(4) Neutralisation: the clarified wastewater enters the neutralisation tank for dosing to adjust the pH of the wastewater to 9 - 11;
(5) Filtration: after neutralization, the wastewater enters the dual media filter to filter and remove solids and flocs in the water as well as residual impurities in the wastewater.
When the differential pressure between the inlet and outlet of the filter system or the working time reaches the set value, the system starts backwashing to ensure that the filter media is clean and effective;
(6) Wastewater desliming treatment: according to the clarifier treated sludge enters into the sludge buffer tank with sufficient agitation, enters into the sludge dewatering machine through the sludge transfer pump, discharges the absolutely dry sludge after dehydration, and then transports the separated filtrate into the wastewater buffer tank.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211033385.2A CN115403182B (en) | 2022-08-26 | 2022-08-26 | Desulfurization wastewater treatment system and process |
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| Publication Number | Publication Date |
|---|---|
| LU503889B1 true LU503889B1 (en) | 2023-10-09 |
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ID=84161637
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| LU503889A LU503889B1 (en) | 2022-08-26 | 2023-04-08 | A desulfurization wastewater treatment system and process |
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| CN (1) | CN115403182B (en) |
| LU (1) | LU503889B1 (en) |
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|---|---|---|---|---|
| CN203474565U (en) * | 2013-09-23 | 2014-03-12 | 浙江东发环保工程有限公司 | Novel desulfurization wastewater treatment system |
| CN104150669B (en) * | 2014-08-22 | 2016-02-03 | 国家电网公司 | Heat-engine plant desulfurized waste water purification system and purifying method |
| CN105110510A (en) * | 2015-09-16 | 2015-12-02 | 山东电力工程咨询院有限公司 | Desulfurization waste water treatment system and treatment method capable of preventing sewage blocking |
| CN106430781B (en) * | 2016-11-04 | 2023-05-12 | 山东华特环保科技有限公司 | Desulfurization wastewater zero-emission treatment system and treatment method for recycling sludge |
| CN108046478A (en) * | 2018-01-15 | 2018-05-18 | 华电莱州发电有限公司 | A kind of power plant desulfurization wastewater treatment system and technique |
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| CN115403182A (en) | 2022-11-29 |
| CN115403182B (en) | 2024-02-02 |
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