CN111762930A - Economical recycling treatment system and method for circulating water and sewage - Google Patents
Economical recycling treatment system and method for circulating water and sewage Download PDFInfo
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- CN111762930A CN111762930A CN202010652609.2A CN202010652609A CN111762930A CN 111762930 A CN111762930 A CN 111762930A CN 202010652609 A CN202010652609 A CN 202010652609A CN 111762930 A CN111762930 A CN 111762930A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 384
- 239000010865 sewage Substances 0.000 title claims abstract description 77
- 238000004064 recycling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 31
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 104
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000001179 sorption measurement Methods 0.000 claims abstract description 56
- 230000003647 oxidation Effects 0.000 claims abstract description 47
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 47
- 238000007872 degassing Methods 0.000 claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims description 48
- 238000005554 pickling Methods 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 44
- 238000005406 washing Methods 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 20
- 238000011001 backwashing Methods 0.000 claims description 15
- 238000005273 aeration Methods 0.000 claims description 14
- 238000006477 desulfuration reaction Methods 0.000 claims description 14
- 230000023556 desulfurization Effects 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 description 9
- 230000008901 benefit Effects 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013497 data interchange Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- C02F1/001—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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
-
- 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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
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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)
- Water Treatment By Sorption (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses an economical recycling treatment system and method for circulating sewage, wherein a circulating sewage inlet pipeline is communicated with an inlet of a circulating sewage pool, an outlet of the circulating sewage pool is communicated with an inlet of an ozone oxidation reactor, a water outlet of the ozone oxidation reactor is communicated with an inlet of a degassing pool, a water outlet of the degassing pool is communicated with an inlet of a biological activated carbon filter, an outlet of the biological activated carbon filter is communicated with an inlet of a middle pool, an outlet of the middle pool is communicated with an inlet of an electro-adsorption module through a security filter system, a water outlet of the electro-adsorption module is communicated with an inlet of a water generating pool, the system and the method can efficiently recycle the circulating water and sewage of the power plant at low cost, realize zero emission of the circulating water and sewage of the power plant, ensure safe and stable operation of a circulating water system, and do not cause secondary pollution to the environment.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to an economical recycling treatment system and method for circulating water and sewage.
Background
The national water pollution prevention and control action plan (ten items of water for short) provides that the environment benefit, the economic benefit and the social benefit win more according to the principles of water saving priority, space balance, system management and two-hand force development by taking the improvement of the water environment quality as a core. In order to meet the national requirements on water pollution treatment and water resource protection, high-water-consumption enterprises must vigorously push forward water-saving recycling, greatly reduce fresh water consumption and wastewater discharge, and gradually advance to zero wastewater discharge. Wherein, the water consumption of the power plant accounts for about 20 percent of the total industrial water consumption, and the circulating cooling water system needs to consume 60 to 80 percent of water. The main pollutants influencing the recycling of the circulating water sewage are inorganic salts, so that the zero discharge of the wastewater of the power plant is realized fundamentally, the water treatment work of the power plant is mainly focused on the recycling treatment of the circulating cooling water, and the key for realizing water saving and emission reduction is to select an economic, reliable and efficient inorganic salt removal technical route.
At present, two circulating water recycling ways exist, wherein one way is to use the circulating water as make-up water for a coal conveying, body removing and wet desulphurization system; the other is to further desalt and concentrate the water through reverse osmosis treatment, the fresh water produced by the desalination can replace the fresh water to return to the upstream of the water chain of the whole plant, the concentrated drainage is used for downstream water systems such as desulfurization and the like, but the usage is more complex and the cost is higher, and because organic matters, suspended matters, bacteria, silicic acid compounds and various chemicals added in the circulating water treatment process have stronger pollution to the reverse osmosis membrane, the system is difficult to operate, and the high-efficiency recycling of the circulating water sewage is difficult to realize.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an economical recycling treatment system and method for circulating water and sewage, which can efficiently recycle the circulating water and sewage of a power plant at low cost, realize zero emission of the circulating water and sewage of the power plant, ensure safe and stable operation of a circulating water system and avoid secondary pollution to the environment.
In order to achieve the aim, the economical recycling treatment system for the circulating sewage comprises a circulating sewage inlet pipeline, a circulating sewage pool, an ozone oxidation reactor, a degassing pool, a biological activated carbon filter, an intermediate pool, an electric adsorption module, a water production pool and a security filter system;
the inlet of the circulating sewage water tank is communicated with the inlet of the circulating sewage water tank, the outlet of the circulating sewage water tank is communicated with the inlet of the ozone oxidation reactor, the water outlet of the ozone oxidation reactor is communicated with the inlet of the degassing water tank, the water outlet of the degassing water tank is communicated with the inlet of the biological activated carbon filter, the outlet of the biological activated carbon filter is communicated with the inlet of the middle water tank, the outlet of the middle water tank is communicated with the inlet of the electric adsorption module through the security filter system, and the water outlet of the electric adsorption module is communicated with the inlet of the water generating tank.
The device also comprises a pickling solution return pipe, a pickling water tank, a pickling water pump, a pickling water inlet main pipe, a pickling solution inlet valve, a concentrated water outlet valve, a flushing sewage draining pipe and a desulfurization process water tank; the water outlet of the electric adsorption module is communicated with the inlet of the pickling water tank through a pickling solution return pipe, the outlet of the pickling water tank is communicated with the inlet of the electric adsorption module through a pickling water pump, a pickling water inlet main pipe and a pickling solution inlet valve, and the outlet of the electric adsorption module is communicated with the inlet of the desulfurization process water tank through a concentrated water outlet valve and a flushing sewage discharge pipe.
The outlet of the circulating sewage water tank is communicated with the ozone oxidation reactor through a water inlet pump, the ozone oxidation reactor is communicated with the degassing water tank through an ozone oxidation water outlet pipeline, and the gas outlet of the degassing water tank is communicated with a degassing water exhaust pipeline.
The ozone tail gas destructor, the ozone generator and the ozone inlet valve are also included; the outlet of the ozone generator is communicated with an ozone inlet at the bottom of the ozone oxidation reactor through an ozone inlet valve, an ozone concentration detector is communicated with a pipeline between the ozone generator and the ozone inlet valve, an air outlet at the top of the ozone oxidation reactor is communicated with an ozone tail gas destructor, and an ozone tail gas monitor is arranged at an air outlet at the top of the ozone oxidation reactor.
The outlet of the aeration fan is communicated with one end of the air blowing-off inlet pipe and one end of the backwashing air inlet pipe through the air inlet pipe main pipe, the other end of the air blowing-off inlet pipe is connected with the aeration device at the bottom of the degassing water tank and passes through the aeration device, and the other end of the backwashing air inlet pipe is communicated with the backwashing air inlet hole at the bottom of the biological activated carbon filter.
The air blowing-off inlet pipe is provided with an air blowing-off inlet valve, and the backwashing air inlet pipe is provided with a backwashing inlet valve.
The water outlet of the degassing water tank is communicated with the inlet of the biological activated carbon filter through the raw water pump, and the outlet of the biological activated carbon filter is communicated with the middle water tank through the water outlet pipeline of the activated carbon filter.
The security filtering system comprises a water producing pump, #1 security filter, a water producing inlet pipe, a water producing inlet valve, a flushing water pump, #2 security filter, a flushing water inlet pipe and a flushing water inlet valve;
the water outlet of the intermediate water tank is communicated with the inlet of the electric adsorption module through a water producing pump, #1 security filter, a water producing water inlet pipe and a water producing water inlet valve, and the flushing water outlet of the intermediate water tank is communicated with the inlet of the electric adsorption module through a flushing water pump, #2 security filter, a flushing water inlet pipe and a flushing water inlet valve.
The outlet of the electro-adsorption module is communicated with the inlet of the water producing pool through a water producing outlet valve and a water producing outlet pipe, and the outlet of the water producing pool is communicated with a water supplementing pipeline of a circulating water system through a water producing recycling water pump.
The economical recycling treatment method of the circulating water sewage comprises the following steps:
1) circulating sewage is discharged into a circulating sewage pool through a circulating sewage inlet pipeline to be collected, buffered and stood, then enters an ozone contact oxidation column at the bottom of an ozone oxidation reactor through a water inlet pump, the ozone contact oxidation column adopts a mode that gas and water flow upwards in the same direction, ozone prepared by an ozone generator is used for aerating wastewater through a titanium plate micropore gas distribution plate on a support plate in the ozone oxidation reactor, and then is discharged into an ozone tail gas destructor from the top of the ozone oxidation reactor to be treated and then is discharged harmlessly;
2) the effluent output by the ozone generator enters a degassing water tank, the bottom of the degassing water tank is provided with a disc aeration head, and air is blown into the water through the disc aeration head to blow off residual ozone in the wastewater and reduce dissolved oxygen of the ozone effluent;
3) the water output by the degassing water tank enters the biological activated carbon filter from the bottom of the biological activated carbon filter, overflows from a clean water area at the upper part of the biological activated carbon filter and enters a middle water tank for collection;
when water is produced, a water production pump is started, a water production inlet valve is opened, a flushing water inlet valve and a pickling solution inlet valve are closed, water in an intermediate water tank is input into a #1 security filter to be filtered and then enters an electro-adsorption module through the water production inlet valve, wastewater to be treated flows between a positive electrode and a negative electrode in the electro-adsorption module, and finally, desalted water enters the water production tank through a water production outlet pipe; the produced water in the water producing pool is supplemented back to a water supplementing pipeline of a circulating water system through a produced water recycling water pump to be used as supplemented water for recycling;
when sewage is discharged, a flushing water inlet valve is opened, a produced water inlet valve and a pickling solution inlet valve are closed, a positive electrode and a negative electrode in the electric adsorption module are in short circuit, a direct current electric field disappears, a flushing water pump is started, water in the middle water tank is sent into a #2 security filter to be filtered and then enters the electric adsorption module through the flushing water inlet valve, flushing water flows between the positive electrode and the negative electrode, desorbed particles in a channel are flushed out to generate concentrated water, and the concentrated water enters a desulfurization process water tank through a flushing sewage discharge pipe through a concentrated water outlet valve to be subjected to gradient utilization;
when in acid washing, the water inlet valve of the acid washing solution is opened, the water inlet valve of the flushing water and the water inlet valve of the produced water are closed, the acid washing water pump is started, the acid washing solution in the acid washing water tank enters the electric adsorption module through the water inlet valve of the acid washing solution to wash the water flow passage of the electric adsorption module, and the waste liquid after washing returns to the acid washing water tank through the water return valve of the acid washing solution and the water return pipe of the acid washing solution to be recycled.
The invention has the following beneficial effects:
the economical recycling treatment system and method for the circulating water sewage firstly remove organic matters from the circulating water sewage by adopting an ozone-biological activated carbon process, and then desalt and recycle the circulating water sewage through an electric adsorption module. Wherein, there are three main effects in the ozone oxidation stage: on one hand, the organic matter is directly degraded, and the organic load entering an active carbon pool is reduced; on the other hand, macromolecular organic matters are degraded into micromolecular organic matters, the molecular weight distribution of the organic matters in water is changed, the biodegradability of the organic matters in water is improved, and the subsequent activated carbon process is favorable for enhancing the adsorption degradation of the middle and small molecular weight organic matters; the last function is to oxygenate the subsequent active carbon process, ensure sufficient dissolved oxygen in water, and be beneficial to the growth of aerobic microorganisms of the active carbon; in the active carbon adsorption stage, the active carbon has the functions of adsorption, catalyst and chemical reaction active multiple carriers, so that aerobic biocenosis can be dispersed on the surface of the active carbon, and biological active carbon is formed by coating to fully play the synergistic effect of biochemical and physicochemical treatment, thereby prolonging the working period of the active carbon, greatly improving the treatment efficiency and improving the effluent quality. In addition, the ozone-biological activated carbon process is used as pretreatment of the electric adsorption module, so that the content of organic matters in concentrated water in the subsequent electric adsorption module can be effectively reduced, and the safety and feasibility of recycling the concentrated water to the water for the desulfurization process are ensured. In addition, the circulating water sewage treated by the ozone-activated carbon process enters the electric adsorption module through the security filter system to remove inorganic salts, compared with the traditional membrane method and desalting processes such as ion exchange and EDI (electronic data interchange), the electric adsorption has wider salt content adaptation range to the coming water quality, and in actual operation, the design of desalination rate can be carried out according to the recycling requirement of produced water, so that the produced water quality is stable, the industrial circulating reuse water index is met, the water production rate is higher than that of the existing traditional desalination process, the concentrated water quantity is very small, and concentrated water measurement does not concentrate organic matters, and the normal operation of a desulfurization system can be ensured not to be influenced when the concentrated water is used as desulfurization process water.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a circulating sewage inlet pipe, 2 is a circulating sewage pool, 3 is a water inlet pump, 4 is an ozone oxidation reactor, 5 is an ozone oxidation outlet pipe, 6 is a degassing pool, 7 is an ozone generator, 8 is an ozone concentration detector, 9 is an ozone inlet valve, 10 is an ozone tail gas monitor, 11 is an ozone tail gas destructor, 12 is an aeration fan, 13 is an inlet pipe main pipe, 14 is a blow-off inlet pipe, 15 is a blow-off inlet valve, 16 is a degassing water exhaust pipe, 17 is a raw water pump, 18 is a biological activated carbon filter, 19 is an activated carbon filter outlet pipe, 20 is an intermediate pool, 21 is a water production pump, 22 is a #1 security filter, 23 is a water production inlet pipe, 24 is a water production inlet valve, 25 is an electro-adsorption module, 26 is a water production outlet valve, 27 is a water production outlet pipe, 28 is a water production pool, 29 is a water production recycling water pump, 30 is a circulating water system water replenishing pipe, and, 31 is a rinse water pump, 32 is a #2 cartridge filter, 33 is a rinse water inlet pipe, 34 is a rinse water inlet valve, 35 is a concentrate outlet valve, 36 is a rinse sewage drain pipe, 37 is a desulfurization process water tank, 38 is a pickling tank, 39 is a pickling water pump, 40 is a pickling water inlet main pipe, 41 is a pickling water inlet valve, 42 is a pickling water return valve, 43 is a pickling water return pipe, 44 is a backwash air inlet pipe, and 45 is a backwash air inlet valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the economical recycling treatment system for circulating sewage of the present invention comprises a circulating sewage incoming water pipeline 1, a circulating sewage pool 2, an ozone oxidation reactor 4, a degassing pool 6, a biological activated carbon filter 18, an intermediate pool 20, an electro-adsorption module 25, a water production pool 28 and a security filter system; the circulating sewage inlet pipeline 1 is communicated with an inlet of a circulating sewage pool 2, an outlet of the circulating sewage pool 2 is communicated with an inlet of an ozone oxidation reactor 4, a water outlet of the ozone oxidation reactor 4 is communicated with an inlet of a degassing pool 6, a water outlet of the degassing pool 6 is communicated with an inlet of a biological activated carbon filter 18, an outlet of the biological activated carbon filter 18 is communicated with an inlet of an intermediate pool 20, an outlet of the intermediate pool 20 is communicated with an inlet of an electro-adsorption module 25 through a security filter system, and a water outlet of the electro-adsorption module 25 is communicated with an inlet of a water production pool 28.
The invention also comprises a pickling solution return pipe 43, a pickling water tank 38, a pickling water pump 39, a pickling water inlet main pipe 40, a pickling solution inlet valve 41, a concentrated water outlet valve 35, a flushing sewage discharge pipe 36 and a desulfurization process water tank 37; the water outlet of the electric adsorption module 25 is communicated with the inlet of the pickling water tank 38 through a pickling solution return pipe 43, the outlet of the pickling water tank 38 is communicated with the inlet of the electric adsorption module 25 through a pickling water pump 39, a pickling water inlet main pipe 40 and a pickling solution inlet valve 41, and the outlet of the electric adsorption module 25 is communicated with the inlet of the desulfurization process water tank 37 through a concentrated water outlet valve 35 and a flushing sewage discharge pipe 36.
The outlet of the circulating sewage water tank 2 is communicated with an ozone oxidation reactor 4 through a water inlet pump 3, the ozone oxidation reactor 4 is communicated with a degassing water tank 6 through an ozone oxidation water outlet pipeline 5, and the gas outlet of the degassing water tank 6 is communicated with a degassing water exhaust pipeline 16.
The invention also comprises an ozone tail gas destructor 11, an ozone generator 7 and an ozone inlet valve 9; the outlet of the ozone generator 7 is communicated with the ozone inlet at the bottom of the ozone oxidation reactor 4 through an ozone inlet valve 9, the pipeline between the ozone generator 7 and the ozone inlet valve 9 is communicated with an ozone concentration detector 8, the gas outlet at the top of the ozone oxidation reactor 4 is communicated with an ozone tail gas destructor 11, and the gas outlet at the top of the ozone oxidation reactor 4 is provided with an ozone tail gas monitor 10.
The outlet of the aeration fan 12 is communicated with one end of a stripping air inlet pipe 14 and one end of a backwashing air inlet pipe 44 through an air inlet pipe main pipe 13, the other end of the stripping air inlet pipe 14 is connected with an aeration device at the bottom of the degassing water tank 6 for passing through, and the other end of the backwashing air inlet pipe 44 is communicated with a backwashing air inlet hole at the bottom of the biological activated carbon filter 18.
The air stripping air inlet pipe 14 is provided with an air stripping air inlet valve 15, and the backwashing air inlet pipe 44 is provided with a backwashing air inlet valve 45; the water outlet of the degassing water tank 6 is communicated with the inlet of a biological activated carbon filter 18 through a raw water pump 17, and the outlet of the biological activated carbon filter 18 is communicated with an intermediate water tank 20 through an activated carbon filter water outlet pipeline 19.
The security filtering system comprises a water producing pump 21, #1 security filter 22, a water producing inlet pipe 23, a water producing inlet valve 24, a flushing water pump 31, #2 security filter 32, a flushing water inlet pipe 33 and a flushing water inlet valve 34; the water outlet of the intermediate reservoir 20 is communicated with the inlet of the electro-adsorption module 25 through a water production pump 21, #1 cartridge filter 22, a water production inlet pipe 23 and a water production inlet valve 24, and the flushing water outlet of the intermediate reservoir 20 is communicated with the inlet of the electro-adsorption module 25 through a flushing water pump 31, #2 cartridge filter 32, a flushing water inlet pipe 33 and a flushing water inlet valve 34.
The outlet of the electro-adsorption module 25 is communicated with the inlet of a water producing pool 28 through a water producing outlet valve 26 and a water producing outlet pipe 27, and the outlet of the water producing pool 28 is communicated with a water replenishing pipeline 30 of a circulating water system through a water producing reuse water pump 29.
The economical recycling treatment method of the circulating water sewage comprises the following steps:
1) circulating sewage is discharged into a circulating sewage pool 2 through a circulating sewage inlet pipeline 1 to be collected, buffered and kept stand, and then enters an ozone contact oxidation column at the bottom of an ozone oxidation reactor 4 through a water inlet pump 3, the ozone contact oxidation column adopts a mode of upward and cocurrent flow of gas and water, ozone prepared by an ozone generator 7 is used for aerating wastewater through a titanium plate micropore gas distribution plate on a support plate in the ozone oxidation reactor 4, and then is discharged into an ozone tail gas destructor 11 from the top of the ozone oxidation reactor 4 to be treated and then discharged harmlessly;
2) the effluent output by the ozone generator 7 enters a degassing water tank 6, a disc aeration head is arranged at the bottom of the degassing water tank 6, and air is blown into the water through the disc aeration head to blow off residual ozone in the wastewater and reduce dissolved oxygen of the ozone effluent;
3) the water output from the degassing water tank 6 enters the biological activated carbon filter 18 from the bottom of the biological activated carbon filter 18, overflows from a clean water area at the upper part of the biological activated carbon filter 18 and enters an intermediate water tank 20 for collection;
when water is produced, the water production pump 21 is started, the water production inlet valve 24 is opened, the flushing water inlet valve 34 and the pickling solution inlet valve 41 are closed, water in the intermediate water tank 20 is input into the #1 security filter 22 to be filtered and then enters the electro-adsorption module 25 through the water production inlet valve 24, wastewater to be treated flows between the anode and the cathode in the electro-adsorption module 25, and finally, desalted water enters the water production tank 28 through the water production outlet pipe 27; the produced water in the water producing tank 28 is supplemented back to a water supplementing pipeline 30 of the circulating water system through a produced water recycling water pump 29 to be used as supplemented water for recycling;
when sewage is discharged, a flushing water inlet valve 34 is opened, a water production inlet valve 24 and a pickling solution inlet valve 41 are closed, a positive electrode and a negative electrode in the electric adsorption module 25 are in short circuit, a direct current electric field disappears, a flushing water pump 31 is started, water in the intermediate water tank 20 is sent into a #2 security filter 32 to be filtered and then enters the electric adsorption module 25 through the flushing water inlet valve 34, flushing water flows between the positive electrode and the negative electrode, desorbed particles in a channel are flushed out to generate concentrated water, and the concentrated water enters a desulfurization process water tank 37 through a flushing sewage discharge pipe 36 through a concentrated water outlet valve 35 for gradient utilization;
when in acid washing, the acid washing liquid inlet valve 41 is opened, the flushing water inlet valve 34 and the water production inlet valve 24 are closed, the acid washing water pump 39 is started, acid washing liquid in the acid washing water tank 38 enters the electric adsorption module 25 through the acid washing liquid inlet valve 41 to wash a water flow channel of the electric adsorption module 25, and waste liquid after washing returns to the acid washing water tank 38 through the acid washing liquid return valve 42 and the acid washing liquid return pipe 43 to be recycled.
The raw materials used by the active carbon are wide, the price is low, the removal rate of organic pollutants is more than 50%, the removal rate is improved by 15-20% compared with the conventional treatment, and the removal of chromaticity, odor, ammonia nitrogen, P, iron and manganese can be realized simultaneously.
The invention can effectively remove salts in the sewage of the circulating water, has simple process route and higher pollution resistance, improves the recycling capability of the sewage of the circulating water, greatly reduces the fresh water consumption and the waste water discharge amount of the thermal power plant, solves the key problem for realizing the zero discharge of the waste water of the whole thermal power plant, and has larger economic and social benefits.
Claims (10)
1. An economical recycling treatment system for circulating sewage, which is characterized by comprising a circulating sewage inlet pipeline (1), a circulating sewage pool (2), an ozone oxidation reactor (4), a degassing pool (6), a biological activated carbon filter (18), an intermediate pool (20), an electric adsorption module (25), a water production pool (28) and a security filter system;
the circulating sewage inlet pipeline (1) is communicated with the inlet of a circulating sewage pool (2), the outlet of the circulating sewage pool (2) is communicated with the inlet of an ozone oxidation reactor (4), the water outlet of the ozone oxidation reactor (4) is communicated with the inlet of a degassing pool (6), the water outlet of the degassing pool (6) is communicated with the inlet of a biological activated carbon filter (18), the outlet of the biological activated carbon filter (18) is communicated with the inlet of a middle pool (20), the outlet of the middle pool (20) is communicated with the inlet of an electric adsorption module (25) through a security filter system, and the water outlet of the electric adsorption module (25) is communicated with the inlet of a water production pool (28).
2. The economical recycling treatment system for sewage from circulating water of claim 1, further comprising a pickling solution return pipe (43), a pickling water tank (38), a pickling water pump (39), a pickling water inlet main pipe (40), a pickling solution water inlet valve (41), a concentrated water outlet valve (35), a flushing sewage pipe (36) and a desulfurization process water tank (37); the water outlet of the electric adsorption module (25) is communicated with the inlet of the pickling water tank (38) through a pickling solution return pipe (43), the outlet of the pickling water tank (38) is communicated with the inlet of the electric adsorption module (25) through a pickling water pump (39), a pickling water inlet main pipe (40) and a pickling solution inlet valve (41), and the outlet of the electric adsorption module (25) is communicated with the inlet of the desulfurization process water tank (37) through a concentrated water outlet valve (35) and a flushing sewage discharge pipe (36).
3. The economical recycling treatment system for the recycled sewage of claim 1, wherein the outlet of the recycled sewage pool (2) is communicated with the ozone oxidation reactor (4) through the water inlet pump (3), the ozone oxidation reactor (4) is communicated with the degassing pool (6) through the ozone oxidation water outlet pipeline (5), and the gas outlet of the degassing pool (6) is communicated with the degassing water exhaust pipeline (16).
4. The economical recycling treatment system for sewage from circulating water as in claim 1, further comprising an ozone tail gas destructor (11), an ozone generator (7) and an ozone inlet valve (9); an outlet of the ozone generator (7) is communicated with an ozone inlet at the bottom of the ozone oxidation reactor (4) through an ozone inlet valve (9), an ozone concentration detector (8) is communicated on a pipeline between the ozone generator (7) and the ozone inlet valve (9), an air outlet at the top of the ozone oxidation reactor (4) is communicated with an ozone tail gas destructor (11), and an ozone tail gas monitor (10) is arranged at an air outlet at the top of the ozone oxidation reactor (4).
5. The economical recycling treatment system for sewage discharged from circulating water according to claim 1, wherein the outlet of the aeration fan (12) is communicated with one end of the air blowing-off inlet pipe (14) and one end of the backwashing air inlet pipe (44) through the air inlet pipe main pipe (13), the other end of the air blowing-off inlet pipe (14) is communicated with the aeration device at the bottom of the degassing water tank (6), and the other end of the backwashing air inlet pipe (44) is communicated with the backwashing air inlet hole at the bottom of the biological activated carbon filter (18).
6. The economical recycling treatment system for sewage discharged from circulating water according to claim 1, wherein the air inlet pipe (14) is provided with an air inlet valve (15) for blowing, and the air inlet pipe (44) for backwashing is provided with an air inlet valve (45) for backwashing.
7. The economical recycling treatment system for sewage discharged from circulating water according to claim 1, wherein the water outlet of the degassing water tank (6) is communicated with the inlet of the biological activated carbon filter (18) through the raw water pump (17), and the outlet of the biological activated carbon filter (18) is communicated with the intermediate water tank (20) through the water outlet pipeline (19) of the activated carbon filter.
8. The economical recycling treatment system for sewage from circulating water according to claim 1, wherein the security filter system comprises a water producing pump (21), #1 security filter (22), a water producing inlet pipe (23), a water producing inlet valve (24), a flushing water pump (31), #2 security filter (32), a flushing water inlet pipe (33) and a flushing water inlet valve (34);
the water production outlet of the intermediate water tank (20) is communicated with the inlet of the electric adsorption module (25) through a water production pump (21), #1 cartridge filter (22), a water production inlet pipe (23) and a water production inlet valve (24), and the flushing water outlet of the intermediate water tank (20) is communicated with the inlet of the electric adsorption module (25) through a flushing water pump (31), #2 cartridge filter (32), a flushing water inlet pipe (33) and a flushing water inlet valve (34).
9. The economical recycling treatment system for sewage discharged from circulating water according to claim 1, wherein the outlet of the electro-adsorption module (25) is communicated with the inlet of the water production tank (28) through a water production outlet valve (26) and a water production outlet pipe (27), and the outlet of the water production tank (28) is communicated with a water replenishing pipeline (30) of the circulating water system through a water production recycling pump (29).
10. An economical recycling treatment method for circulating water sewage, which is characterized in that the economical recycling treatment system for circulating water sewage based on any one of claims 1 to 9 comprises the following steps:
1) circulating sewage is discharged into a circulating sewage pool (2) through a circulating sewage inlet pipeline (1) to be collected, buffered and stood, and then enters an ozone contact oxidation column at the bottom of an ozone oxidation reactor (4) through a water inlet pump (3), the ozone contact oxidation column adopts a mode of upward and cocurrent flow of gas and water, ozone prepared by an ozone generator (7) aerates wastewater through a titanium plate micropore gas distribution plate on a support plate in the ozone oxidation reactor (4), and then is discharged into an ozone tail gas destructor (11) from the top of the ozone oxidation reactor (4) to be treated and then discharged harmlessly;
2) effluent output by the ozone generator (7) enters a degassing water tank (6), a disc aeration head is arranged at the bottom of the degassing water tank (6), air is blown into the water through the disc aeration head to blow off residual ozone in the wastewater, and dissolved oxygen of the ozone effluent is reduced;
3) the water output by the degassing water tank (6) enters the biological activated carbon filter (18) from the bottom of the biological activated carbon filter (18), overflows from a clear water area at the upper part of the biological activated carbon filter (18) and enters an intermediate water tank (20) for collection;
when water is produced, a water production pump (21) is started, a water production inlet valve (24) is opened, a flushing water inlet valve (34) and a pickling solution inlet valve (41) are closed, water in an intermediate water tank (20) is input into a #1 security filter (22) to be filtered and then enters an electro-adsorption module (25) through the water production inlet valve (24), wastewater to be treated flows through the electro-adsorption module (25) between a positive electrode and a negative electrode, and finally desalted water enters a water production tank (28) through a water production outlet pipe (27); the produced water in the water producing pool (28) is supplemented into a water supplementing pipeline (30) of the circulating water system through a produced water recycling water pump (29) to be used as supplemented water for recycling;
when sewage is discharged, a flushing water inlet valve (34) is opened, a water production inlet valve (24) and a pickling solution inlet valve (41) are closed, a positive electrode and a negative electrode in an electric adsorption module (25) are in short circuit, a direct current electric field disappears, a flushing water pump (31) is started, water in an intermediate water tank (20) is sent into a #2 security filter (32) to be filtered and then enters the electric adsorption module (25) through the flushing water inlet valve (34), flushing water flows between the positive electrode and the negative electrode, desorbed particles in a channel are flushed out to generate concentrated water, and the concentrated water enters a desulfurization process water tank (37) through a flushing sewage discharge pipe (36) through a concentrated water outlet valve (35) to be subjected to gradient utilization;
when in acid washing, the acid washing liquid inlet valve (41) is opened, the flushing water inlet valve (34) and the water production inlet valve (24) are closed, the acid washing water pump (39) is started, acid washing liquid in the acid washing water tank (38) enters the electric adsorption module (25) through the acid washing liquid inlet valve (41) to wash a water flow channel of the electric adsorption module, and waste liquid after washing returns to the acid washing water tank (38) through the acid washing liquid return valve (42) and the acid washing liquid return pipe (43) to be recycled.
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