CN105906127A - Desulfurization wastewater near-zero release treatment system and method - Google Patents
Desulfurization wastewater near-zero release treatment system and method Download PDFInfo
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- CN105906127A CN105906127A CN201610406417.7A CN201610406417A CN105906127A CN 105906127 A CN105906127 A CN 105906127A CN 201610406417 A CN201610406417 A CN 201610406417A CN 105906127 A CN105906127 A CN 105906127A
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- denitration
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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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to a desulfurization wastewater near-zero release treatment system and method. Desulfurization wastewater passes through a purification unit at first, calcium, magnesium, silicon oxide and other scale forming matters and COD and other organic matters are removed, and filtering separation is performed to obtain salty mud; the obtained filtrate enters a reduction unit, the reduction unit adopts EDR or DTRO for performing concentration, recycle water is obtained to be recycled, some concentrated solution is returned to the purification unit, and some concentrated solution enters a denitration unit; sediments generated during a reaction of the denitration unit are filtered through a micro-filtration membrane, clean liquid enters an evaporation crystallization unit, evaporation, crystallization and separation are performed to obtain industrial sodium chloride, condensate water is recycled, and a small amount of crystallization mother solution is drained outwards and returned back to the purification unit and the denitration unit. Sodium chloride and other inorganic salt in desulfurization wastewater are effectively separated and recycled, meanwhile, the obtained recycle water completely meets the requirement for recycling, and the recovery rate is high.
Description
Technical field
The present invention relates to desulfurization wastewater processing technology field, be specifically related to the system and method for a kind of desulfurization wastewater near-zero release.
Background technology
The waste water using wet gypsum method desulfurization to produce contains substantial amounts of chloride ion, sulfate radical, calcium, magnesium plasma, and soluble solid is between 10000～40000 mg/L.If this kind of waste water is without processing and outer row further, it will to environmental danger.
Recycling further to desulfurization wastewater, and during the course the higher sodium chloride of value is separated and recovered, it is met the sodium chloride of industrial level, not only help solution environmental problem and have also obtained economic benefit, the large-scale application of desulfurization wastewater near-zero release is played an important role, is the directions that are continually striving to of those skilled in the art.
Summary of the invention
The technical problem to be solved is to provide a kind of desulfurization wastewater near-zero release processing system and method for above-mentioned prior art.
The present invention solves the technical scheme that the problems referred to above are used: a kind of desulfurization wastewater near-zero release processing system, including set gradually
Clean unit: remove calcium, magnesium, the easy scale forming matter of silicon oxide and COD type organic in desulfurization wastewater；
Minimizing unit: concentrate further desulfurization wastewater to concentrated solution, produce can the recycle-water of reuse, a concentrated solution part returns clean unit, and another part enters denitration unit；
Denitration unit: the sulfate radical in precipitation waste water, filters and separates, clear liquid devaporation crystalline element；
Evaporative crystallization unit: to concentrating clear liquid evaporative crystallization isolated industrial chlorinations sodium, condensed fluid is back to clean unit and denitration unit as recycle-water reuse, a small amount of mother solution of outer row.
Preferably, described minimizing unit is to use pole-reversing electroosmosis EDR, or disc tube reverse osmosis (dt-ro) DTRO, or the combination of aforementioned upgrading unit.
Preferably, described evaporative crystallization unit is to use the outer crystallization mechanism for steam, or the crystallization mechanism of mechanical vapor-compression, and crystallizer uses forced circulation crystallizer, or draft tube baffle crystallizer.
Desulfurization wastewater near-zero release processing method based on said system, including following operation,
Purify: remove calcium, magnesium, the easy scale forming matter of silicon oxide and COD type organic in desulfurization wastewater；
Minimizing: concentrate desulfurization wastewater further to concentrated solution, it is thus achieved that TDS reaches the concentrated solution of more than 90000mg/L, and a concentrated solution part returns clean unit, and another part enters denitration unit, the recycle-water reuse of gained；
Denitration: the sulfate radical in precipitation waste water, filters and separates, clear liquid devaporation crystalline element；
Evaporative crystallization: to concentrated solution evaporative crystallization isolated industrial chlorinations sodium, condensed fluid is as recycle-water reuse, and a small amount of mother solution of outer row is back to purify and denitration operation.
Preferably, cleaning procedure uses Calx+soda, or Caustic soda+soda, or Calx+flue gas, or calcium chloride+soda, or any one combination with activated carbon aforementioned removes the easy scale forming matter of the calcium in desulfurization wastewater, magnesium and silicon oxide, heavy metal substance and COD type organic, then using micro-filtrate membrane filtration separation brine sludge and clear liquid, clear liquid enters next step minimizing operation.
Preferably, minimizing is through disc tube reverse osmosis (dt-ro) DTRO, or pole-reversing electroosmosis EDR, or the combination concentration of aforementioned upgrading unit.
Preferably, denitration uses calcium method denitration, and calcium chloride and sulfate radical react generation Gypsum Fibrosum, and use micro-filtration membrane to filter, clear liquid devaporation Crystallization Procedure.
Preferably, evaporative crystallization unit uses the outer crystallization mode for steam, or mechanical vapor-compression crystallization mode, and crystallizer uses forced circulation crystallizer, or draft tube baffle crystallizer.
Compared with prior art, it is an advantage of the current invention that: the sodium chloride in desulfurization wastewater and other inorganic salts are efficiently separated and reclaimed, and the recycle-water obtained during concurrently separating fully meets reuse requirement.While solving environmental problem, obtain economic benefit, reduce the operating cost of desulfurization wastewater zero discharge treatment.
Accompanying drawing explanation
Fig. 1 is the structural representation of desulfurization wastewater near-zero release processing system in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As it is shown in figure 1, the desulfurization wastewater near-zero release processing system in the present embodiment, the clean unit including setting gradually: remove calcium, magnesium, the easy scale forming matter of silicon oxide and COD type organic in desulfurization wastewater；Minimizing unit: concentrate further desulfurization wastewater to concentrated solution, produce can the recycle-water of reuse, a concentrated solution part returns clean unit, and another part enters denitration unit；Denitration unit: the sulfate radical in precipitation waste water, filters and separates, clear liquid devaporation crystalline element；Evaporative crystallization unit: to concentrating clear liquid evaporative crystallization isolated industrial chlorinations sodium, condensed fluid is back to clean unit and denitration unit as recycle-water reuse, a small amount of mother solution of outer row.
Minimizing unit is to use pole-reversing electroosmosis EDR, or disc tube reverse osmosis (dt-ro) DTRO, or the combination of aforementioned upgrading unit.
Evaporative crystallization unit is to use the outer crystallization mechanism for steam, or the crystallization mechanism of mechanical vapor-compression, and crystallizer uses forced circulation crystallizer, or draft tube baffle crystallizer.
Desulfurization wastewater near-zero release processing method based on said system
Embodiment 1
Certain power plant desulfurization waste water TDS is 20000 mg/L, this waste water is after Calx+flue gas+active carbon purifying, entering minimizing EDR unit and being concentrated into TDS further is 120000 mg/L, dope 10% is back to clean unit, and 90% enters denitration unit, and dope reacts generation precipitation in denitration unit with calcium chloride, after the organic micro-filtrate membrane filtration of tubular type, gained clear liquid enters evaporative crystallization unit, separates and is dried to obtain sodium chloride, Condensate reuse.Through said system, can produce the sodium chloride meeting GB/T 5462-2003 II grade standard, Water Sproading rate reaches 97%.
Embodiment 2
Certain power plant desulfurization waste water TDS is 30000 mg/L, this waste water is after Caustic soda+soda purifies, entering minimizing DTRO unit and being concentrated into TDS further is 100000 mg/L, clear liquid reuse, and dope 20% is back to clean unit, 80% enters denitration unit, dope reacts generation precipitation in denitration unit with calcium chloride, after ceramic micro filter membrane filtration, enters evaporative crystallization unit, crystallization obtains sodium chloride, Condensate reuse.Through said system, can produce the sodium chloride meeting GB/T 5462-2003 II grade standard, Water Sproading rate reaches 96%.
In addition to the implementation, present invention additionally comprises the technical scheme that other embodiments, all employing equivalents or equivalence substitute mode are formed, all should fall within the scope of the hereto appended claims.
Claims (8)
1. a desulfurization wastewater near-zero release processing system, it is characterised in that: include setting gradually
Clean unit: remove calcium, magnesium, the easy scale forming matter of silicon oxide and COD type organic in desulfurization wastewater；
Minimizing unit: concentrate further desulfurization wastewater to concentrated solution, produce can the recycle-water of reuse, a concentrated solution part returns clean unit, and another part enters denitration unit；
Denitration unit: the sulfate radical in precipitation waste water, filters and separates, clear liquid devaporation crystalline element；
Evaporative crystallization unit: to concentrating clear liquid evaporative crystallization isolated industrial chlorinations sodium, condensed fluid is back to clean unit and denitration unit as recycle-water reuse, a small amount of mother solution of outer row.
Desulfurization wastewater near-zero release processing system the most according to claim 1, it is characterised in that: described minimizing unit is to use pole-reversing electroosmosis EDR, or disc tube reverse osmosis (dt-ro) DTRO, or the combination of aforementioned upgrading unit.
Desulfurization wastewater near-zero release processing system the most according to claim 1, it is characterized in that: described evaporative crystallization unit is to use the outer crystallization mechanism for steam, or the crystallization mechanism of mechanical vapor-compression, crystallizer uses forced circulation crystallizer, or draft tube baffle crystallizer.
4. a desulfurization wastewater near-zero release processing method, it is characterised in that: include following operation,
Purify: remove calcium, magnesium, the easy scale forming matter of silicon oxide and COD type organic in desulfurization wastewater；
Minimizing: concentrate desulfurization wastewater further to concentrated solution, it is thus achieved that TDS reaches the concentrated solution of more than 90000mg/L, and a concentrated solution part returns clean unit, and another part enters denitration unit, the recycle-water reuse of gained；
Denitration: the sulfate radical in precipitation waste water, filters and separates, clear liquid devaporation crystalline element；
Evaporative crystallization: to concentrated solution evaporative crystallization isolated industrial chlorinations sodium, condensed fluid is as recycle-water reuse, and a small amount of mother solution of outer row is back to purify and denitration operation.
Desulfurization wastewater near-zero release processing method the most according to claim 4, it is characterized in that: cleaning procedure uses Calx+soda, or Caustic soda+soda, or Calx+flue gas, or calcium chloride+soda, or any one combination with activated carbon aforementioned removes the easy scale forming matter of the calcium in desulfurization wastewater, magnesium and silicon oxide, heavy metal substance and COD type organic, then using micro-filtrate membrane filtration separation brine sludge and clear liquid, clear liquid enters next step minimizing operation.
Desulfurization wastewater near-zero release processing method the most according to claim 4, it is characterised in that: minimizing is through disc tube reverse osmosis (dt-ro) DTRO, or pole-reversing electroosmosis EDR, or the combination concentration of aforementioned upgrading unit.
Desulfurization wastewater near-zero release processing method the most according to claim 4, it is characterised in that: denitration uses calcium method denitration, and calcium chloride and sulfate radical react generation Gypsum Fibrosum, and use micro-filtration membrane to filter, clear liquid devaporation Crystallization Procedure.
Desulfurization wastewater near-zero release processing method the most according to claim 4, it is characterised in that: evaporative crystallization unit uses the outer crystallization mode for steam, or mechanical vapor-compression crystallization mode, and crystallizer uses forced circulation crystallizer, or draft tube baffle crystallizer.
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| CN201610406417.7A CN105906127A (en) | 2016-06-12 | 2016-06-12 | Desulfurization wastewater near-zero release treatment system and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517629A (en) * | 2016-12-28 | 2017-03-22 | 北京国电龙源环保工程有限公司 | Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method |
| CN106517606A (en) * | 2016-11-27 | 2017-03-22 | 杭州水处理技术研究开发中心有限公司 | Treating apparatus capable of realizing zero discharge of desulphurization wastewater from power plant |
| CN108211706A (en) * | 2018-02-12 | 2018-06-29 | 山东大学 | A kind of desulphurization denitration and wastewater zero discharge system and method for steel industry |
| CN108640397A (en) * | 2018-07-20 | 2018-10-12 | 刘柏海 | A kind of heat-engine plant desulfurized waste water treatment process based on inorganic adsorbent technology |
| CN110817925A (en) * | 2019-10-23 | 2020-02-21 | 江苏沙钢集团有限公司 | Method for resource utilization of desulfurized fly ash |
| CN113461233A (en) * | 2021-07-16 | 2021-10-01 | 青岛理工大学 | Composite device for hardness removal of industrial circulating cooling water and control method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517606A (en) * | 2016-11-27 | 2017-03-22 | 杭州水处理技术研究开发中心有限公司 | Treating apparatus capable of realizing zero discharge of desulphurization wastewater from power plant |
| CN106517629A (en) * | 2016-12-28 | 2017-03-22 | 北京国电龙源环保工程有限公司 | Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method |
| CN108211706A (en) * | 2018-02-12 | 2018-06-29 | 山东大学 | A kind of desulphurization denitration and wastewater zero discharge system and method for steel industry |
| CN108640397A (en) * | 2018-07-20 | 2018-10-12 | 刘柏海 | A kind of heat-engine plant desulfurized waste water treatment process based on inorganic adsorbent technology |
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| CN110817925A (en) * | 2019-10-23 | 2020-02-21 | 江苏沙钢集团有限公司 | Method for resource utilization of desulfurized fly ash |
| CN113461233A (en) * | 2021-07-16 | 2021-10-01 | 青岛理工大学 | Composite device for hardness removal of industrial circulating cooling water and control method thereof |
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