CN112010513A - High-salt-content organic wastewater recycling treatment system and treatment method - Google Patents

High-salt-content organic wastewater recycling treatment system and treatment method Download PDF

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Publication number
CN112010513A
CN112010513A CN202011034710.8A CN202011034710A CN112010513A CN 112010513 A CN112010513 A CN 112010513A CN 202011034710 A CN202011034710 A CN 202011034710A CN 112010513 A CN112010513 A CN 112010513A
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wastewater
unit
salt
tank
communicated
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麻晓越
刘海洋
谷小兵
白玉勇
崔焕民
李叶红
李飞
荆亚超
杨言
高阳
彭思伟
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Datang Environment Industry Group Co Ltd
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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
    • 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
    • C01D3/14—Purification
    • 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
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

The invention provides a resourceful treatment system and a resourceful treatment method for high-salt-content organic wastewater, wherein the treatment system comprises: the device comprises a regulating tank, a high-density sedimentation tank, an electro-Fenton unit, a clarification tank, an ultrafiltration unit, a nanofiltration unit and a first evaporative crystallization unit which are sequentially connected; the water outlet of the high-density sedimentation tank is communicated with the water inlet of the electro-Fenton unit, the water outlet of the clarification tank is communicated with the water inlet of the ultrafiltration unit, the high-salt-content wastewater outlet of the ultrafiltration unit is communicated with the water inlet of the nanofiltration unit, and the monovalent salt wastewater outlet of the nanofiltration unit is communicated with the water inlet of the first evaporative crystallization unit. The method improves the treatment effect of the high-salt organic wastewater and realizes the resource utilization of the wastewater.

Description

High-salt-content organic wastewater recycling treatment system and treatment method
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high-salt organic wastewater recycling treatment system and a treatment method.
Background
Nowadays, high-salt-content organic wastewater generated in industrial production of food, chemical industry, pharmacy, leather, textile, printing and dyeing and the like has the characteristics of high salt content, difficult biodegradation, high toxicity and the like. If the fertilizer is directly discharged into the environment, the problems of serious pollution of water, rising of salt content of the water, salinization of soil and the like can be caused, and serious threats are brought to human health and the survival of animals and plants in water. At present, the main methods for treating the high-salt organic wastewater include a physicochemical method, a thermal concentration method, a membrane separation method, a biochemical method and the like.
The traditional physical and chemical method mainly comprises the technologies of precipitation, flocculation, adsorption, advanced oxidation and the like, and can remove part of pollutants such as organic matters, ammonia nitrogen, heavy metal ions and the like; the heat concentration and the membrane separation are effective methods for realizing the brine separation, high-quality fresh water can be obtained, but high-concentration organic matters and impurities can cause pollution blockage of membrane materials and damage to heat concentration equipment; the biochemical method is a common method for treating organic wastewater, can decompose and convert organic matters into harmless gas, liquid or solid products, but has the inhibiting and poisoning effects on microorganisms due to the high-concentration salt content, so that the application of the biochemical method in the wastewater with high salt content is limited. Therefore, the integration and combination of a plurality of technologies form the complementary advantages of various technologies, improve the treatment effect of the high-salt organic wastewater, and realize the resource utilization of the wastewater, which becomes a technical problem to be solved in the field.
Disclosure of Invention
Therefore, the invention provides a high-salt-content organic wastewater recycling treatment system and a treatment method, which can improve the treatment effect of high-salt-content organic wastewater and realize the recycling of wastewater.
The invention provides a high-salt organic wastewater resourceful treatment system, which comprises: the device comprises a regulating tank, a high-density sedimentation tank, an electro-Fenton unit, a clarification tank, an ultrafiltration unit, a nanofiltration unit and a first evaporative crystallization unit which are sequentially connected; the water outlet of the high-density sedimentation tank is communicated with the water inlet of the electro-Fenton unit, the water outlet of the clarification tank is communicated with the water inlet of the ultrafiltration unit, the high-salt-content wastewater outlet of the ultrafiltration unit is communicated with the water inlet of the nanofiltration unit, and the monovalent salt wastewater outlet of the nanofiltration unit is communicated with the water inlet of the first evaporative crystallization unit.
In the using process of the invention, the high-salt organic wastewater is introduced into the regulating tank, the stability of water quality and water quantity is realized in the regulating tank, the pH value of the wastewater is regulated, and the effluent is conveyed to the high-density sedimentation tank; the wastewater is flocculated, precipitated and clarified in a high-density sedimentation tank, and the effluent is conveyed to an electro-Fenton unit; the wastewater is decomposed by the electrochemical-Fenton synergistic action in the electro-Fenton unit, and effluent is conveyed to a clarification tank; settling and clarifying the wastewater in a clarification tank, separating and removing most organic matters and impurities, and conveying effluent to an ultrafiltration unit; conveying the filtered high-salt-content wastewater of the ultrafiltration unit to a nanofiltration unit; the high-salt-content wastewater is separated from monovalent salt in the nanofiltration unit, and the monovalent salt wastewater after being filtered by the nanofiltration unit is conveyed to the first evaporative crystallization unit: and the monovalent salt wastewater is evaporated and crystallized to produce NaCl industrial salt with the quality of more than two levels, and the steam generated in the evaporation and crystallization process is condensed to produce fresh water for recycling. The method improves the treatment effect of the high-salt organic wastewater and realizes the resource utilization of the wastewater.
The high-concentration organic matter wastewater outlet of the ultrafiltration unit is communicated with the water inlet of the biochemical treatment unit, and the water outlet of the biochemical treatment unit is communicated with the water inlet of the clarification tank.
And the device further comprises a second evaporative crystallization unit, wherein a high-valence salt wastewater outlet of the nanofiltration unit is communicated with a water inlet of the second evaporative crystallization unit, and a water outlet of the second evaporative crystallization unit is communicated with a water inlet of the biochemical treatment unit.
Further, the sludge treatment device also comprises a sludge treatment unit, wherein the sludge outlet of the high-density sedimentation tank and the sludge outlet of the clarification tank are communicated with the sludge inlet of the sludge treatment unit.
Further, a medicament feeding device and an aeration device are arranged in the adjusting tank and the electro-Fenton unit.
Furthermore, the biochemical treatment unit comprises an anaerobic biological filter module and an aerobic biological filter module.
The invention also provides a resource treatment method of the high-salt organic wastewater, which comprises the following steps:
step S1, the wastewater enters a regulating reservoir, acid-base regulating agent is added into the regulating reservoir through an agent adding device to regulate the pH value of the wastewater to a target pH value, and the wastewater is uniformly mixed through an aeration device;
step S2, the wastewater treated by the adjusting tank enters a high-density sedimentation tank, a softening agent, a flocculating agent and a coagulant aid are added into the high-density sedimentation tank, and the wastewater is coagulated, precipitated and clarified to remove suspended matters, partial organic matters and impurities in the wastewater;
step S3, the wastewater treated by the high-density sedimentation tank enters an electro-Fenton unit, an acid-base adjusting agent is added into the electro-Fenton unit through an agent adding device to adjust the pH value of the wastewater to a target pH value, a ferrite agent is added, and aeration is carried out on a cathode through an aeration device to decompose part of organic matters in the wastewater;
step S4, the wastewater treated by the electro-Fenton unit enters a clarification tank to carry out sedimentation and clarification on the wastewater;
step S5, the wastewater treated by the clarification tank enters an ultrafiltration unit to respectively obtain high-salt-content wastewater and high-concentration organic wastewater;
step S6, the high-salt-content wastewater enters a nanofiltration unit to respectively obtain high-salt-content wastewater and monovalent-salt-content wastewater;
and step S7, allowing the monovalent salt wastewater to enter a first evaporative crystallization unit to respectively obtain fresh water and industrial salt.
The method comprises the steps of introducing high-salt organic wastewater into an adjusting tank, stabilizing the quality and quantity of water in the adjusting tank, adjusting the pH value of the wastewater, and conveying effluent to a high-density sedimentation tank; the wastewater is flocculated, precipitated and clarified in a high-density sedimentation tank, and the effluent is conveyed to an electro-Fenton unit; the wastewater is decomposed by the electrochemical-Fenton synergistic action in the electro-Fenton unit, and effluent is conveyed to a clarification tank; settling and clarifying the wastewater in a clarification tank, separating and removing most organic matters and impurities, and conveying effluent to an ultrafiltration unit; conveying the filtered high-salt-content wastewater of the ultrafiltration unit to a nanofiltration unit; the high-salt-content wastewater is separated from monovalent salt in the nanofiltration unit, and the monovalent salt wastewater after being filtered by the nanofiltration unit is conveyed to the first evaporative crystallization unit: and the monovalent salt wastewater is evaporated and crystallized to produce NaCl industrial salt with the quality of more than two levels, and the steam generated in the evaporation and crystallization process is condensed to produce fresh water for recycling. The method improves the treatment effect of the high-salt organic wastewater and realizes the resource utilization of the wastewater.
And step S8, the high-concentration organic wastewater enters a biochemical treatment unit, the biochemical treatment unit adopts an immobilized biological filter technology, the high-concentration organic wastewater is treated by an anaerobic biological filter module and an aerobic biological filter module, organic matters and impurities in the high-concentration organic wastewater are degraded, and the treated wastewater is introduced into a clarification tank.
Further, step S9 is included, the high-valence salt wastewater enters a second evaporative crystallization unit to respectively obtain low-concentration organic wastewater and mixed salt, and the low-concentration organic wastewater is introduced into a biochemical treatment unit.
Further, step S10 is included, the sludge settled in the high-density sedimentation tank and the clarification tank is passed to a sludge disposal unit for subsequent treatment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram showing a high-salt organic wastewater recycling treatment system.
In the drawings are labeled:
1 regulating tank
2 high-density sedimentation tank
3 electro-Fenton unit
4 clarification tank
5 Ultrafiltration Unit
6 nanofiltration unit
7 first evaporative crystallization unit
8 Biochemical treatment unit
9 second evaporative crystallization Unit
10 sludge disposal unit
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a resourceful treatment system for high-salt organic wastewater, which comprises the following components in percentage by weight as shown in figure 1: the device comprises a regulating tank 1, a high-density sedimentation tank 2, an electro-Fenton unit 3, a clarification tank 4, an ultrafiltration unit 5, a nanofiltration unit 6 and a first evaporative crystallization unit 7 which are connected in sequence. Wherein, the high-density sedimentation tank 2 is provided with three interfaces comprising a water inlet, a water outlet and a sludge outlet; the clarification tank 4 is provided with three interfaces comprising a water inlet, a water outlet and a sludge outlet; the ultrafiltration unit 5 is provided with three interfaces, including a water inlet, a high-salt-content wastewater outlet and a high-concentration organic matter wastewater outlet; the nanofiltration unit 6 is provided with three interfaces, including a water inlet, a monovalent salt wastewater outlet and a high-valent salt wastewater outlet. The water outlet of the high-density sedimentation tank 2 is communicated with the water inlet of the electro-Fenton unit 3, the water outlet of the clarification tank 4 is communicated with the water inlet of the ultrafiltration unit 5, the high-salt-content wastewater outlet of the ultrafiltration unit 5 is communicated with the water inlet of the nanofiltration unit 6, and the monovalent salt wastewater outlet of the nanofiltration unit 6 is communicated with the water inlet of the first evaporative crystallization unit 7.
Preferably, the invention also comprises a biochemical treatment unit 8, wherein a high-concentration organic matter wastewater outlet of the ultrafiltration unit 5 is communicated with a water inlet of the biochemical treatment unit 8, and a water outlet of the biochemical treatment unit 8 is communicated with a water inlet of the clarification tank 4.
Further preferably, the invention further comprises a second evaporative crystallization unit 9, wherein a high-valence salt wastewater outlet of the nanofiltration unit 6 is communicated with a water inlet of the second evaporative crystallization unit 9, and a water outlet of the second evaporative crystallization unit 9 is communicated with a water inlet of the biochemical treatment unit 8.
Optionally, the invention further comprises a sludge disposal unit 10, and the sludge outlet of the high-density sedimentation tank 2 and the sludge outlet of the clarification tank 4 are both communicated with the sludge inlet of the sludge disposal unit 10.
In the using process of the invention, the high-salt organic wastewater is introduced into the regulating tank 1, the stability of water quality and water quantity is realized in the regulating tank 1, the pH value of the wastewater is regulated, and the effluent is conveyed to the high-density sedimentation tank 2; the wastewater is flocculated, precipitated and clarified in the high-density sedimentation tank 2, and the effluent is conveyed to an electro-Fenton unit 3; the wastewater is decomposed by the electrochemical-Fenton synergistic action in the electro-Fenton unit 3, and effluent is conveyed to a clarification tank 4; the wastewater is settled and clarified in a clarification tank 4, most organic matters and impurities are separated and removed, and effluent is conveyed to an ultrafiltration unit 5; conveying the high-salt-content wastewater filtered by the ultrafiltration unit 5 to a nanofiltration unit 6; the high-salt wastewater is separated from monovalent salt in the nanofiltration unit 6, and the monovalent salt wastewater filtered by the nanofiltration unit 6 is conveyed to the first evaporative crystallization unit 7: and the monovalent salt wastewater is evaporated and crystallized to produce NaCl industrial salt with the quality of more than two levels, and the steam generated in the evaporation and crystallization process is condensed to produce fresh water for recycling. The method improves the treatment effect of the high-salt organic wastewater and realizes the resource utilization of the wastewater. High-valence salt wastewater filtered by the nanofiltration unit 6 is conveyed to a second evaporative crystallization unit 9, the high-valence salt wastewater is evaporated and crystallized to produce mixed salt, low-concentration organic wastewater produced by condensing steam in the second evaporative crystallization unit 9 is conveyed to a biochemical treatment unit 8, and in addition, high-concentration organic wastewater filtered by the ultrafiltration unit 5 is conveyed to the biochemical treatment unit 8, treated by the biochemical treatment unit 8 and then flows back to the clarification tank 4 to enter circulation again. The biochemical treatment unit 8 comprises an anaerobic biological filter module and an aerobic biological filter module, and organic matters and impurities in the wastewater are degraded by adopting an immobilized biological filter technology.
The adjusting tank 1 is internally provided with a medicament adding device and an aeration device, the medicament adding device adds acid and alkali medicaments into the adjusting tank 1 to adjust the pH value of the wastewater, and the aeration device is used for uniformly mixing the wastewater to stabilize the quality and quantity of the wastewater. The electro-Fenton unit 3 is also provided with a medicament adding device and an aeration device, the medicament adding device adds medicaments such as acid, alkali and the like into the electro-Fenton unit 3 to adjust the pH value of the wastewater to 3-4, and ferrous salt is added to adjust Fe in the wastewater2+And (4) carrying out aeration on the cathode through an aeration device, and decomposing the organic matters under the electrochemical action.
The invention also provides a resource treatment method of the high-salt organic wastewater, which comprises the following steps:
and step S1, the wastewater enters the adjusting tank 1, an acid-base adjusting medicament is added into the adjusting tank 1 through a medicament adding device to adjust the pH value of the wastewater to a target pH value, and the wastewater is uniformly mixed through an aeration device. Wherein the acid-base regulating agent is H2SO4HCl, NaOH or Ca (OH)2And any one or more of acid-base agents.
And step S2, the wastewater treated by the adjusting tank 1 enters the high-density sedimentation tank 2, and a softening agent, a flocculating agent and a coagulant aid are added into the high-density sedimentation tank 2 to coagulate, precipitate and clarify the wastewater so as to remove suspended matters, partial organic matters and impurities in the wastewater. The high-density sedimentation tank 2 comprises a mixing zone, a flocculation zone, a sedimentation zone, a softening agent, a flocculating agent, a coagulant aid adding module and a sludge conveying device which work independently, wherein the softening agent and the flocculating agent adding module are connected to the mixing zone; the coagulant aid adding module is connected to the flocculation area; the bottom of the settling zone returns a part of the sludge to the flocculation zone through a pipeline, and the rest sludge is discharged to the sludge disposal unit 10 through a pipeline.
Step S3, the wastewater treated by the high-density sedimentation tank 2 enters an electro-Fenton unit 3, an acid-base adjusting agent is added into the electro-Fenton unit 3 through an agent adding device to adjust the pH value of the wastewater to a target pH value, a ferrite agent is added, and aeration is performed on a cathode through an aeration device to decompose part of organic matters in the wastewater. Adding acid, alkali and other agents into the electro-Fenton unit 3 by an agent adding device to adjust the pH value of the wastewater to 3-4, and adding ferrous salt to adjust Fe in the wastewater2+And (4) carrying out aeration on the cathode through an aeration device, and decomposing the organic matters under the electrochemical action.
And step S4, the wastewater treated by the electro-Fenton unit 3 enters a clarification tank 4 to carry out sedimentation and clarification on the wastewater. The clarification tank 4 removes substances such as sludge and impurities generated by the electro-Fenton unit 3 and the biochemical treatment unit 8 through precipitation, the water inlet quality requirement of the subsequent ultrafiltration unit 5 is ensured, and the sludge of the clarification tank 4 is discharged to the sludge disposal unit 10 through a pipeline.
And step S5, the wastewater treated by the clarification tank 4 enters an ultrafiltration unit 5 to respectively obtain high-salt wastewater and high-concentration organic wastewater. Ultrafiltration unit 5 can get rid of most organic matters in the waste water, and the high salt waste water of output is carried to nanofiltration unit 6, and the high concentration organic matter waste water that produces is carried to biochemical treatment unit 8.
And step S6, the high-salt-content wastewater enters a nanofiltration unit 6 to respectively obtain high-salt-content wastewater and monovalent-salt-content wastewater. The nanofiltration unit 6 can realize the separation of monovalent salt, and monovalent salt wastewater generated after being filtered by a nanofiltration membrane is a solution mainly containing sodium chloride; the high-valence salt wastewater generated by the nanofiltration unit 6 is conveyed to a second evaporative crystallization unit 9.
And step S7, the monovalent salt wastewater enters a first evaporative crystallization unit 7 to respectively obtain fresh water and industrial salt. The monovalent salt wastewater is treated by the first evaporative crystallization unit 7 to produce industrial salt with quality more than two levels, and can be sold; and fresh water produced after steam condensation in the evaporative crystallization unit is recycled to the power plant.
And step S8, the high-concentration organic wastewater enters a biochemical treatment unit 8, the biochemical treatment unit 8 adopts an immobilized biological filter technology, the high-concentration organic wastewater is treated by an anaerobic biological filter module and an aerobic biological filter module, organic matters and impurities in the high-concentration organic wastewater are degraded, and the treated wastewater is introduced into a clarification tank 4.
And step S9, the high-valence salt wastewater enters a second evaporative crystallization unit 9 to respectively obtain low-concentration organic wastewater and mixed salt, and the low-concentration organic wastewater is introduced into a biochemical treatment unit 8. The high-valence salt wastewater is treated by a second evaporative crystallization unit to produce mixed salt for outward transportation; and (3) conveying the low-concentration organic wastewater generated after the steam is condensed in the evaporation and crystallization process to a biochemical treatment unit 8.
And step S10, the sludge precipitated in the high-density sedimentation tank 2 and the clarification tank 4 is introduced into the sludge disposal unit 10 to carry out subsequent treatment on the sludge, so that the pollution of the sludge to the external environment is reduced.
In a specific embodiment, the quality of the phenolic high-salt organic wastewater is as follows: COD is approximately equal to 3500-4000mg/L, SS is approximately equal to 220mg/L, TDS is approximately equal to 20000-25000mg/L, pH is approximately equal to 9-10, and the content of phenols is approximately equal to 420 mg/L. The treatment is carried out by the following steps:
(1) the wastewater enters an adjusting tank 1, acid liquor is added into the wastewater, and the pH value is adjusted to 5-8.
(2) The wastewater enters a high-density sedimentation tank 2 from an adjusting tank 1, a softening agent and a polyferric flocculant are added into a mixing area of the high-density sedimentation tank 2, and the wastewater is rapidly stirred; then the mixture flows into a flocculation area, 0.3 percent of coagulant aid PAM is added into the flocculation area, and the mixture is stirred at a low speed to form large alum floc; the wastewater flows into a settling zone, and the wastewater is clarified and sludge-concentrated in the settling zone; the bottom of the settling zone returns a part of sludge to the flocculation zone through a return pipe, and the rest sludge is discharged to the sludge disposal unit 10 through a pipe.
(3) The wastewater enters an electro-Fenton unit 3 from a high-density sedimentation tank 2, the pH is adjusted to 3-4, and FeSO is added4The dosage form of the medicament,generation of H under energized and aerated conditions2O2With Fe2+Reaction to form hydroxyl radical (. OH) and Fe3+Decomposing organic substances such as phenols by the strong oxidizing property of hydroxyl radicals, Fe3+And reduced to Fe at the cathode2+So that the oxidation reaction is circularly carried out.
(4) The wastewater enters a clarification tank 4 from the electro-Fenton unit 3 for sedimentation and clarification, and the generated sludge is discharged to a sludge disposal unit 10 through a pipeline.
(5) The wastewater enters an ultrafiltration unit 5 from a clarification tank 4, most organic matters and other impurities are removed from the wastewater through the separation of a multi-stage nanofiltration membrane component, the generated high-concentration organic wastewater enters a biochemical treatment unit 8, and the generated high-salt-content wastewater enters a nanofiltration unit 6.
(6) And (3) the high-salt-content wastewater discharged from the ultrafiltration unit 5 enters a nanofiltration unit 6, monovalent salt is separated from the wastewater through a multistage nanofiltration membrane component, and monovalent salt wastewater and high-salt-content wastewater are generated.
(7) The monovalent salt wastewater enters a first evaporative crystallization unit 7 to respectively obtain fresh water and industrial salt. The monovalent salt wastewater is treated by the first evaporative crystallization unit 7 to produce industrial salt with quality more than two levels, and can be sold; and fresh water produced after steam condensation in the evaporative crystallization unit is recycled to the power plant.
(8) The high-concentration organic wastewater enters a biochemical treatment unit 8, the biochemical treatment unit 8 adopts an immobilized biological filter technology, the high-concentration organic wastewater is treated by an anaerobic biological filter module and an aerobic biological filter module, organic matters and impurities in the high-concentration organic wastewater are degraded, and the treated wastewater is introduced into a clarification tank 4.
(9) The high-valence salt wastewater is treated by a second evaporative crystallization unit 9 to produce mixed salt for outward transportation; and (3) conveying the low-concentration organic wastewater generated after the steam is condensed in the evaporation and crystallization process to a biochemical treatment unit 8.
(10) The sludge precipitated in the high-density sedimentation tank 2 and the clarification tank 4 is introduced into the sludge treatment unit 10, and the sludge treatment unit 10 performs subsequent treatment on the sludge, so that the pollution of the sludge to the external environment is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a high salt organic waste water resourceful treatment system that contains which characterized in that includes:
the device comprises a regulating tank, a high-density sedimentation tank, an electro-Fenton unit, a clarification tank, an ultrafiltration unit, a nanofiltration unit and a first evaporative crystallization unit which are sequentially connected;
the water outlet of the high-density sedimentation tank is communicated with the water inlet of the electro-Fenton unit, the water outlet of the clarification tank is communicated with the water inlet of the ultrafiltration unit, the high-salt-content wastewater outlet of the ultrafiltration unit is communicated with the water inlet of the nanofiltration unit, and the monovalent salt wastewater outlet of the nanofiltration unit is communicated with the water inlet of the first evaporative crystallization unit.
2. The recycling treatment system for organic wastewater with high salt content according to claim 1, further comprising:
and the high-concentration organic matter wastewater outlet of the ultrafiltration unit is communicated with the water inlet of the biochemical treatment unit, and the water outlet of the biochemical treatment unit is communicated with the water inlet of the clarification tank.
3. The recycling treatment system for organic wastewater with high salt content as claimed in claim 2, further comprising:
and the high-valence salt wastewater outlet of the nanofiltration unit is communicated with the water inlet of the second evaporative crystallization unit, and the water outlet of the second evaporative crystallization unit is communicated with the water inlet of the biochemical treatment unit.
4. The recycling treatment system for organic wastewater with high salt content according to claim 1, further comprising:
and the sludge outlet of the high-density sedimentation tank and the sludge outlet of the clarification tank are communicated with the sludge inlet of the sludge disposal unit.
5. The recycling treatment system for organic wastewater with high salt content according to any one of claims 1 to 4,
and a medicament feeding device and an aeration device are arranged in the adjusting tank and the electro-Fenton unit.
6. The recycling treatment system for organic wastewater with high salt content according to claim 2 or 3,
the biochemical treatment unit comprises an anaerobic biological filter module and an aerobic biological filter module.
7. A resource treatment method for high-salt-content organic wastewater is characterized by comprising the following steps:
step S1, the wastewater enters a regulating reservoir, acid-base regulating agent is added into the regulating reservoir through an agent adding device to regulate the pH value of the wastewater to a target pH value, and the wastewater is uniformly mixed through an aeration device;
step S2, the wastewater treated by the adjusting tank enters a high-density sedimentation tank, a softening agent, a flocculating agent and a coagulant aid are added into the high-density sedimentation tank, and the wastewater is coagulated, precipitated and clarified to remove suspended matters, partial organic matters and impurities in the wastewater;
step S3, the wastewater treated by the high-density sedimentation tank enters an electro-Fenton unit, an acid-base adjusting agent is added into the electro-Fenton unit through an agent adding device to adjust the pH value of the wastewater to a target pH value, a ferrite agent is added, and aeration is carried out on a cathode through an aeration device to decompose part of organic matters in the wastewater;
step S4, the wastewater treated by the electro-Fenton unit enters a clarification tank to carry out sedimentation and clarification on the wastewater;
step S5, the wastewater treated by the clarification tank enters an ultrafiltration unit to respectively obtain high-salt-content wastewater and high-concentration organic wastewater;
step S6, the high-salt-content wastewater enters a nanofiltration unit to respectively obtain high-salt-content wastewater and monovalent-salt-content wastewater;
and step S7, allowing the monovalent salt wastewater to enter a first evaporative crystallization unit to respectively obtain fresh water and industrial salt.
8. The method for recycling the organic wastewater with high salt content as claimed in claim 7, further comprising:
and step S8, the high-concentration organic wastewater enters a biochemical treatment unit, the biochemical treatment unit adopts the immobilized biological filter technology, the high-concentration organic wastewater is treated by an anaerobic biological filter module and an aerobic biological filter module, organic matters and impurities in the high-concentration organic wastewater are degraded, and the treated wastewater is introduced into a clarification tank.
9. The method for recycling the organic wastewater with high salt content as claimed in claim 8, further comprising:
and step S9, the high-valence salt wastewater enters a second evaporative crystallization unit to respectively obtain low-concentration organic wastewater and mixed salt, and the low-concentration organic wastewater is introduced into a biochemical treatment unit.
10. The resource treatment method for the organic wastewater with high salt content according to any one of claims 7 to 9, further comprising the following steps:
and step S10, the sludge precipitated in the high-density sedimentation tank and the clarification tank is led into a sludge disposal unit to carry out subsequent treatment on the sludge.
CN202011034710.8A 2020-09-27 2020-09-27 High-salt-content organic wastewater recycling treatment system and treatment method Pending CN112010513A (en)

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