CN113461237A - Zero discharge system for salt wastewater treatment - Google Patents

Zero discharge system for salt wastewater treatment Download PDF

Info

Publication number
CN113461237A
CN113461237A CN202110848889.9A CN202110848889A CN113461237A CN 113461237 A CN113461237 A CN 113461237A CN 202110848889 A CN202110848889 A CN 202110848889A CN 113461237 A CN113461237 A CN 113461237A
Authority
CN
China
Prior art keywords
tank
water
wastewater
calcium
nanofiltration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110848889.9A
Other languages
Chinese (zh)
Inventor
蒋路漫
于连涛
殷航
王�华
李颖
仲旭
陈国锋
胡敏娴
费晓韵
朱小龙
刘美芝
袁兰华
王小春
戴君
刘姣女
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hai Rong Thermal Energy Environmental Engineering Co ltd
Original Assignee
Jiangsu Hai Rong Thermal Energy Environmental Engineering Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Hai Rong Thermal Energy Environmental Engineering Co ltd filed Critical Jiangsu Hai Rong Thermal Energy Environmental Engineering Co ltd
Priority to CN202110848889.9A priority Critical patent/CN113461237A/en
Publication of CN113461237A publication Critical patent/CN113461237A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/14—Alkali metal compounds
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/24—Halogens or compounds thereof
    • C25B1/26—Chlorine; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/081—Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor
    • 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
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • 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
    • C02F1/66—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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • C02F2103/08—Seawater, e.g. for desalination
    • 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
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (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)

Abstract

The invention discloses a salt wastewater treatment zero-discharge system, which belongs to the field of water treatment of thermal power plants and comprises a pretreatment system, a salt separation and purification system, a regeneration system and a production system; the pretreatment system comprises a calcium and sulfur removal fluidized bed, a magnesium removal tank, a calcium removal tank, an ultrafiltration device and a neutralization decarburization tank, and the invention takes the reduction of salt introduction from the outside as a starting point, realizes the internal circulation treatment process of salt in the water treatment system of the power plant, and realizes the harmless treatment and resource recycling of the sewage and waste of the thermal power plant. The method has the advantages of obtaining environmental benefits and social benefits, obtaining economic benefits and realizing 'sustainability, emission reduction, consumption reduction and efficiency improvement' of the thermal power plant.

Description

Zero discharge system for salt wastewater treatment
Technical Field
The invention relates to the field of water treatment of thermal power plants, in particular to a salt wastewater treatment zero-discharge system.
Background
In order to meet the environmental protection requirements of the state on thermal power plants, domestic thermal power plants develop 'zero emission' engineering practices for treating tail-end wastewater (high-salinity wastewater mainly comprising desulfurized wastewater) at a time, and the engineering practices have both successful cases and failed teaching and training.
The overall route of the desulfurization wastewater zero-discharge treatment can be basically summarized as the combination of three parts of pretreatment → concentration and decrement → solid-liquid separation. There are three specific forms, the first: pretreatment → membrane concentration → evaporative crystallization process; and the second method comprises the following steps: pretreatment → membrane concentration → flue evaporation process; and the third is that: low-temperature flue gas flash evaporation → concentrated solution drying process. The three modes uniformly have certain defects; for example, a large amount of salt needs to be added in the treatment process for reaction treatment, so that the treatment cost is increased, meanwhile, a large amount of other salt is generated in the treatment process, secondary treatment is needed, the enterprise burden is increased, and the zero emission requirement cannot be completely met.
Based on the above, the invention designs a salt wastewater treatment zero-discharge system to solve the above problems.
Disclosure of Invention
Solves the technical problem
Aiming at the defects in the prior art, the invention provides a salt wastewater treatment zero-discharge system.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a salt wastewater treatment zero-discharge system comprises a pretreatment system, a salt separation and purification system, a regeneration system and a production system; the pretreatment system comprises a calcium-removing and sulfur-removing fluidized bed, a magnesium-removing tank, a calcium-removing tank, an ultrafiltration device and a neutralization decarbonization tank.
Further, the calcium and sulfur removing fluidized bed comprises: the wastewater circularly flows in the calcium-removing and sulfur-removing fluidized bed, lime milk and a flocculating agent are added in the calcium-removing and sulfur-removing fluidized bed, and calcium ions in the lime milk and SO in the wastewater are mixed by the lime milk and the flocculating agent4 2-Calcium sulfate precipitation is generated through reaction, and the precipitated calcium sulfate flows into a limestone slurry tank.
Further, the magnesium removal tank: removal of SO4 2-The wastewater enters a magnesium removal pool, alkaline water and Mg are added into the magnesium removal pool2+With OH in alkaline water-Reaction to form Mg (OH)2。
Further, the decalcification tank: removal of Mg2+The wastewater enters a calcium removal tank, and then sodium carbonate solution and Ca in the wastewater are added into the calcium removal tank2+With CO3 2-Reaction to form CaCO3Precipitation, CaCO3The precipitated calcium sulfate flows into the limestone slurry tank.
Further, the ultrafiltration device removes Ca2+The wastewater enters an ultrafiltration device to filter small particle impurities, alkaline water or acidic water is added into the ultrafiltration device to adjust the pH value to 8-10 before filtration, and a strong oxidant is added to remove organic matters.
Further, the neutralization and decarbonization tank: the wastewater after ultrafiltration enters a neutralization decarburization pool, and then acidic water enters the neutralization decarburization pool, H+With trace CO in the waste water3 2-Reaction to CO2A gas.
Further, the salt separation and purification system consists of a chelating bed and a filtering device, wherein the chelating bed: the wastewater without ions enters a chelating bed for chelating treatment, and resin is adopted to adsorb multivalent cations in the water.
Furthermore, the chelated waste water enters the filtering device, and the filtering device comprises a nanofiltration device, a nanofiltration concentrated water tank, a nanofiltration water production tank, a sea fresh device, a sodium sulfate solution tank and a sodium chloride solution tank.
Furthermore, the wastewater enters a reducing agent and a scale inhibitor before entering the nanofiltration device.
Furthermore, the produced water passing through the nanofiltration device enters a nanofiltration water production tank, the produced water not subjected to nanofiltration device enters a nanofiltration concentrated water tank, the nanofiltration water production tank and the nanofiltration concentrated water tank respectively enter a sea-fresh device, the water in the nanofiltration concentrated water tank passes through the sea-fresh device to generate RO produced water and a sodium sulfate solution, the sodium sulfate solution is stored in a sodium sulfate solution tank, the produced water in the nanofiltration water production tank passes through the sea-fresh device to generate a RO produced water and a sodium chloride mixed solution, and the sodium chloride is easily mixed and stored in the sodium chloride solution tank.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
the invention takes the 'reduction of salt introduction from the outside' as the starting point, realizes the 'internal circulation' treatment process of salt in the water treatment system of the power plant, and realizes the harmless treatment and resource recycling of the sewage and waste of the thermal power plant. The method has the advantages of obtaining environmental benefits and social benefits, obtaining economic benefits and realizing 'sustainability, emission reduction, consumption reduction and efficiency improvement' of the thermal power plant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Example 1
As shown in FIG. 1, the zero discharge system for the quality-based treatment of the high-salinity wastewater of the power plant comprises a pretreatment system, a salt separation and purification system, a regeneration system and a production system;
the pretreatment system comprises a calcium-removing and sulfur-removing fluidized bed, a magnesium-removing tank, a calcium-removing tank, an ultrafiltration device and a neutralization decarbonization tank;
the wastewater circularly flows in the calcium-removing and sulfur-removing fluidized bed, lime milk and a flocculating agent are added in the calcium-removing and sulfur-removing fluidized bed, and calcium ions in the lime milk and SO in the wastewater are mixed by the lime milk and the flocculating agent4 2-Calcium sulfate precipitation is generated through reaction, and the precipitated calcium sulfate flows into a limestone slurry tank;
removal of SO4 2-The wastewater enters a magnesium removal pool, alkaline water and Mg are added into the magnesium removal pool2+With OH in alkaline water-Reaction to form Mg (OH)2Mixing of Mg (OH)2Adding the coal-containing wastewater into a coal-containing wastewater system for use as a decolorizing agent and a flocculating agent, and simultaneously, adding Mg (OH)2The flame retardant can also be added into the fire-fighting field to be used as a flame retardant;
removal of Mg2+The wastewater enters a calcium removal tank, and then sodium carbonate solution and Ca in the wastewater are added into the calcium removal tank2+With CO3 2-Reaction to form CaCO3Precipitation, CaCO3The precipitated calcium sulfate flows into a limestone slurry tank, and CaCO is added3Converted into crystal calcium carbonate, sent to a desulfurizing tower to be reused as a desulfurizing agent, and simultaneously CO is removed3 2-The system is recycled, so that scaling, fouling and blockage of the system are avoided;
removal of Ca2+The wastewater enters an ultrafiltration device to filter small particle impurities, alkaline water or acidic water is added into the ultrafiltration device to adjust the pH to 8-10 before filtration, and a strong oxidant is added to remove organic matters;
the wastewater after ultrafiltration enters a neutralization decarburization pool, and then acidic water enters the neutralization decarburization pool, H+With trace CO in the waste water3 2-Reaction to CO2Gas of CO3 2-The method is complete, so that the scale and dirt blockage of the system is further avoided, the cleanliness of the system is favorably improved, and the system is favorably used for continuous treatment; discharged CO2Absorbing gas with alkaline water to generate sodium carbonate, adding into a calcium removal tank, and adding CO2And when the gas is insufficient, part of the flue gas is extracted for supplement.
The salt separation and purification system consists of a chelating bed and a filtering device, the wastewater with ions removed enters the chelating bed for chelating treatment, and resin can be adopted to adsorb multivalent cations in the water so as to reduce the content of residual heavy metals in the wastewater to 100 ppb;
the wastewater after chelation treatment enters a filtering device, and the filtering device comprises a nanofiltration device, a nanofiltration concentrated water tank, a nanofiltration water production tank, a sea-fresh device, a sodium sulfate solution tank and a sodium chloride solution tank;
before the wastewater enters a nanofiltration device, a reducing agent and a scale inhibitor are added into the wastewater, wherein the reducing agent is NaHSO with the mass concentration of 12%3Adding a 12-fold concentrated solution of reverse osmosis scale inhibitor PTP-0100 with the adding concentration of 5-10mg/L into the solution of 3-6 mg/L;
the method takes the 'reduction of salt introduction from the outside' as the starting point, realizes the 'internal circulation' treatment process of salt in the water treatment system of the power plant, and realizes the harmless treatment and resource recycling of the sewage and waste of the thermal power plant. The method has the advantages that the method obtains environmental benefits and social benefits, obtains economic benefits and realizes 'sustainability, emission reduction, consumption reduction and efficiency improvement' of the thermal power plant;
the water produced by the nanofiltration device enters a nanofiltration water production tank, the water produced by the nanofiltration device enters a nanofiltration concentrated water tank, the nanofiltration water production tank and the nanofiltration concentrated water tank respectively enter a sea fresh water device, the water in the nanofiltration concentrated water tank passes through the sea fresh water device to generate RO water and a sodium sulfate solution, the sodium sulfate solution is stored in a sodium sulfate solution tank, the water produced in the nanofiltration water production tank passes through the sea fresh water device to generate a mixed solution of RO water and sodium chloride, and the sodium chloride is easily mixed and stored in a sodium chloride solution tank;
the regeneration system comprises a bipolar membrane electrodialysis device, an acidic water storage tank, an alkaline water storage tank, an electrolysis chlorine production device and a sodium hypochlorite storage tank;
the regeneration system is composed of acid solution, alkali solution and sodium hypochlorite solution which are formed by mutual coupling of a bipolar membrane electrodialysis device and a sodium hypochlorite generator
In a production system of an acid solution, an alkali solution and a sodium hypochlorite solution which are formed by mutually coupling a bipolar membrane electrodialysis device and a sodium hypochlorite generator, the sodium sulfate solution enters the bipolar membrane electrodialysis, the bipolar membrane electrodialysis carries out electrolysis on the sodium sulfate solution to form acidic (sulfuric acid) water and alkaline (sodium hydroxide) water, the acidic (sulfuric acid) water is stored in an acidic (sulfuric acid) water storage tank, the alkaline water is stored in an alkaline water storage tank, and the sodium sulfate solution after being electrolyzed and diluted is rolled into a sea fresh device again for re-concentration;
the sodium chloride solution enters a bipolar membrane electrodialysis, the bipolar membrane electrodialysis carries out electrolysis on the sodium chloride solution to form acidic (hydrochloric acid) water, alkaline water and a sodium chloride diluted solution (4%), the sodium chloride diluted solution is added into an electrolytic chlorine preparation device to be electrolyzed into a hypochlorous acid solution, and the hypochlorous acid solution is stored in a sodium hypochlorite storage tank;
electrodialysis is carried out through bipolar membrane electrodialysis of a regeneration system to obtain acidic water and alkaline water, and the alkaline water can be used for regeneration of a high-speed mixed bed plasma exchanger, a magnesium removal tank and an ultrafiltration device, and pH value adjustment of a flocculating agent for reutilization; the acidic (sulfuric) water is mainly used as industrial circulating water for acid-adding treatment. Cl in sodium chloride solution－The bipolar membrane is used for producing acid water and hypochlorous acid solution, the acid (hydrochloric acid) water is used as a pH value regulator of systems such as a high-integrity mixed bed regenerant, industrial circulating water, industrial wastewater, deionized water and the like necessary for a power plant, and the hypochlorous acid solution can be used as an oxidation biocide for treating the industrial circulating water and domestic sewage.
The alkaline water can be used for regenerating a high-speed mixed bed plasma exchanger, adjusting the pH value of a magnesium removal pool and an ultrafiltration device and a flocculating agent for reutilization; the acidic (sulfuric) water is mainly used as industrial circulating water for acid-adding treatment. Cl in sodium chloride solution－The bipolar membrane is used for producing acid water and hypochlorous acid solution, the acid (hydrochloric acid) water is used as a pH value regulator of systems such as a high-integrity mixed bed regenerant, industrial circulating water, industrial wastewater, deionized water and the like necessary for a power plant, and the hypochlorous acid solution can be used as an oxidation biocide for treating the industrial circulating water and domestic sewage.
A coagulant production system consisting of a magnesium agent flocculant and a polyferric chloride generator and a production system consisting of a carbon dioxide adsorption tower;
adding acidic (hydrochloric acid) water electrolyzed by sodium chloride solution electrodialysis into a flocculating agent generator, reacting with scrap iron under a circulating condition to generate ferrous chloride, oxidizing with sodium hypochlorite generated in an electrolytic chlorine preparation device, and aging and polymerizing to form a polymeric chloride (sulfuric acid) ferric chloride flocculating agent which can be used as a flocculating agent in systems such as thermal power plant clear water pretreatment, coal-containing wastewater treatment, desulfurization wastewater treatment and the like; simultaneously, compounding magnesium hydroxide generated by a magnesium removal tank and a polymeric chloride (sulfuric acid) ferric oxide flocculant to serve as a flocculation decolorizing agent of the coal-containing wastewater; the carbon dioxide discharged from the neutralization decarbonizer and the carbon dioxide in the extracted part of the flue gas are absorbed by alkaline water to prepare sodium carbonate, the sodium carbonate is added into a calcium removal pool to reduce the hardness of water, and the main component of discharged mud is calcium carbonate which is sent to a desulfurizing tower to be used as a desulfurizing agent. The whole zero emission reduces the addition of external raw materials and reduces the treatment cost.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A zero discharge system of salt waste water treatment which characterized in that: comprises a pretreatment system, a salt separation and purification system, a regeneration system and a production system; the pretreatment system comprises a calcium-removing and sulfur-removing fluidized bed, a magnesium-removing tank, a calcium-removing tank, an ultrafiltration device and a neutralization decarbonization tank.
2. The saline wastewater treatment zero-emission system as claimed in claim 1, wherein the calcium and sulfur removal fluidized bed is: the wastewater circularly flows in the calcium-removing and sulfur-removing fluidized bed, lime milk and a flocculating agent are added in the calcium-removing and sulfur-removing fluidized bed, and calcium ions in the lime milk and SO in the wastewater are mixed by the lime milk and the flocculating agent4 2-Calcium sulfate precipitation is generated through reaction, and the precipitated calcium sulfate flows into a limestone slurry tank.
3. According to claimThe salt wastewater treatment zero-discharge system of claim 2, characterized in that the magnesium removal tank: removal of SO4 2-The wastewater enters a magnesium removal pool, alkaline water and Mg are added into the magnesium removal pool2+With OH in alkaline water-Reaction to form Mg (OH)2。
4. The saline wastewater treatment zero-discharge system according to claim 3, wherein the decalcifying tank: removal of Mg2+The wastewater enters a calcium removal tank, and then sodium carbonate solution and Ca in the wastewater are added into the calcium removal tank2+With CO3 2-Reaction to form CaCO3Precipitation, CaCO3The precipitated calcium sulfate flows into the limestone slurry tank.
5. The saline wastewater treatment zero-discharge system of claim 4, wherein the ultrafiltration device removes Ca2 +The wastewater enters an ultrafiltration device to filter small particle impurities, alkaline water or acidic water is added into the ultrafiltration device to adjust the pH value to 8-10 before filtration, and a strong oxidant is added to remove organic matters.
6. The saline wastewater treatment zero-emission system of claim 5, wherein the neutralization and decarbonization tank is characterized in that: the wastewater after ultrafiltration enters a neutralization decarburization pool, and then acidic water enters the neutralization decarburization pool, H+With trace CO in the waste water3 2-Reaction to CO2A gas.
7. The zero-emission salt wastewater treatment system of any one of claims 1 to 6, wherein the salt separation and purification system comprises a chelating bed and a filtering device, and the chelating bed: the wastewater without ions enters a chelating bed for chelating treatment, and resin is adopted to adsorb multivalent cations in the water.
8. The saline wastewater treatment zero-discharge system according to claim 7, wherein the chelated wastewater enters the filtering device, and the filtering device comprises a nanofiltration device, a nanofiltration concentrated water tank, a nanofiltration water production tank, a desalination device, a sodium sulfate solution tank and a sodium chloride solution tank.
9. The saline wastewater treatment zero-discharge system as claimed in claim 8, wherein the wastewater enters the reducing agent and the scale inhibitor before entering the nanofiltration device.
10. The system of claim 9, wherein the water produced by the nanofiltration device enters a nanofiltration water tank, the water produced by the nanofiltration device enters a nanofiltration concentrated water tank, the nanofiltration water tank and the nanofiltration concentrated water tank respectively enter a desalination device, the water in the nanofiltration concentrated water tank passes through the desalination device to produce RO water and a sodium sulfate solution, the sodium sulfate solution is stored in the sodium sulfate solution tank, the water produced in the nanofiltration water tank passes through the desalination device to produce RO water and a sodium chloride mixed solution, and the sodium chloride mixed solution is easily stored in the sodium chloride solution tank.
CN202110848889.9A 2021-07-27 2021-07-27 Zero discharge system for salt wastewater treatment Pending CN113461237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110848889.9A CN113461237A (en) 2021-07-27 2021-07-27 Zero discharge system for salt wastewater treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110848889.9A CN113461237A (en) 2021-07-27 2021-07-27 Zero discharge system for salt wastewater treatment

Publications (1)

Publication Number Publication Date
CN113461237A true CN113461237A (en) 2021-10-01

Family

ID=77882574

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110848889.9A Pending CN113461237A (en) 2021-07-27 2021-07-27 Zero discharge system for salt wastewater treatment

Country Status (1)

Country Link
CN (1) CN113461237A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114632787A (en) * 2022-05-18 2022-06-17 中化(浙江)膜产业发展有限公司 Industrial salt carbon trapping process

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106396233A (en) * 2016-11-22 2017-02-15 盛发环保科技（厦门）有限公司 Device capable of realizing zero discharge of desulfurization wastewater
CN106995246A (en) * 2017-04-18 2017-08-01 江苏京源环保股份有限公司 Accessory substance realizes the desulfurization wastewater Zero discharging system and technique of disposal of resources in factory
CN108249646A (en) * 2018-03-20 2018-07-06 厦门嘉戎技术股份有限公司 Can resource recycling power plant desulfurization wastewater Zero-discharge treating process and device
US20190077686A1 (en) * 2016-05-31 2019-03-14 Jiangsu Jingyuan Environmental Protection Co., Ltd. Zero-discharge technique for separating sludge and salt from desulfurization wastewater
CN110104851A (en) * 2019-06-04 2019-08-09 北京赛科康仑环保科技有限公司 One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method
CN112875824A (en) * 2021-01-25 2021-06-01 江苏海容热能环境工程有限公司 Desulfurization wastewater zero-discharge system and method based on self-crystallization fluidized bed

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190077686A1 (en) * 2016-05-31 2019-03-14 Jiangsu Jingyuan Environmental Protection Co., Ltd. Zero-discharge technique for separating sludge and salt from desulfurization wastewater
CN106396233A (en) * 2016-11-22 2017-02-15 盛发环保科技（厦门）有限公司 Device capable of realizing zero discharge of desulfurization wastewater
CN106995246A (en) * 2017-04-18 2017-08-01 江苏京源环保股份有限公司 Accessory substance realizes the desulfurization wastewater Zero discharging system and technique of disposal of resources in factory
CN108249646A (en) * 2018-03-20 2018-07-06 厦门嘉戎技术股份有限公司 Can resource recycling power plant desulfurization wastewater Zero-discharge treating process and device
CN110104851A (en) * 2019-06-04 2019-08-09 北京赛科康仑环保科技有限公司 One kind being used for magnesium oxide method power plant desulfurization wastewater Zero discharge treatment method
CN112875824A (en) * 2021-01-25 2021-06-01 江苏海容热能环境工程有限公司 Desulfurization wastewater zero-discharge system and method based on self-crystallization fluidized bed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114632787A (en) * 2022-05-18 2022-06-17 中化(浙江)膜产业发展有限公司 Industrial salt carbon trapping process

Similar Documents

Publication Publication Date Title
CN108529802B (en) Zero-discharge process for discharging high-salt-content wastewater in titanium dioxide production
CN105565573B (en) The device and method of desulfurization wastewater zero discharge treatment
KR102093004B1 (en) Method for comprehensive recovery of magnesium-containing smelting wastewater
CN108623050B (en) Desulfurization wastewater treatment method and system
US9056784B2 (en) High efficiency water-softening process
CN106430786B (en) Desulfurization wastewater treatment method and device
CN110668540A (en) High-salinity wastewater precipitation desalination recycling process
CN113461236A (en) Zero discharge system that high salt waste water of power plant divides matter to handle
CN106630343B (en) A kind of method for treating desulfurized wastewater and system
CN104355473A (en) Method for carrying out desalination and zero-discharge processing of power plant desulphurization wastewater by adopting electrodialysis technology
CN105439341B (en) A kind of brine waste processing system and processing method
CN105621776B (en) A kind of processing method of fire coal boiler fume wet desulphurization waste water
CN101708911A (en) Desulfuration waste water treatment process with membrane method
CN107915354A (en) A kind of desulfurization wastewater zero-emission and resource utilization device and method
CN103288236A (en) Treatment method for salt-containing wastewater
CN106746059B (en) Terminal high salt wastewater treatment system of economical coal fired power plant
CN112794500B (en) Coking wastewater strong brine near-zero emission treatment system and treatment method thereof
CN105481179A (en) Concentrated salt sewage zero-discharge treatment method
CN105502765A (en) System and method for treating desulfurization wastewater and recycling resources cooperatively
CN111170516A (en) Treatment process and treatment system for desulfurization wastewater
CN113461237A (en) Zero discharge system for salt wastewater treatment
CN112573720A (en) Thermal power plant desulfurization wastewater zero-discharge system and method
CN114349207B (en) Zero-emission-oriented high-salinity and high-fluorine mine water purification system and process
CN215975294U (en) Processing apparatus of concentrated water and sodium chloride evaporation mother liquor receive filtering
CN115745279A (en) Desulfurization wastewater hardness removal system and process

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20211001