CN111875180A - Coal chemical industry wastewater zero-discharge integrated treatment system and method - Google Patents

Coal chemical industry wastewater zero-discharge integrated treatment system and method Download PDF

Info

Publication number
CN111875180A
CN111875180A CN202010782263.8A CN202010782263A CN111875180A CN 111875180 A CN111875180 A CN 111875180A CN 202010782263 A CN202010782263 A CN 202010782263A CN 111875180 A CN111875180 A CN 111875180A
Authority
CN
China
Prior art keywords
unit
coal chemical
chemical industry
wastewater
water outlet
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
CN202010782263.8A
Other languages
Chinese (zh)
Inventor
左剑恶
曾凡付
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.)
Tsinghua University
Original Assignee
Tsinghua University
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 Tsinghua University filed Critical Tsinghua University
Priority to CN202010782263.8A priority Critical patent/CN111875180A/en
Publication of CN111875180A publication Critical patent/CN111875180A/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
    • 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
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
    • C01D5/16—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
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/26—Treatment of water, waste water, or sewage by extraction
    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • 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
    • C02F2101/34—Organic compounds containing oxygen
    • C02F2101/345—Phenols
    • 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
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • 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
    • C02F3/02—Aerobic processes
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • C02F3/28—Anaerobic digestion processes
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • 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
    • C02F3/302—Nitrification and denitrification treatment
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • 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
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

Abstract

The invention discloses a coal chemical wastewater zero-discharge integrated treatment system which comprises an oil removal unit, an air flotation turbidity removal unit, a phenol ammonia recovery unit, a biochemical unit, an ozone catalytic oxidation unit, a hard removal silicon removal unit, an ultrafiltration turbidity removal unit, a membrane method concentration unit and a salt separation crystallization unit which are sequentially connected. The invention discloses a zero-discharge integrated treatment method for coal chemical industry wastewater by adopting the treatment system.

Description

Coal chemical industry wastewater zero-discharge integrated treatment system and method
Technical Field
The invention relates to the technical field of coal chemical wastewater treatment, in particular to a zero-discharge integrated treatment system and method for coal chemical wastewater.
Background
Coal chemical industry produces a large amount of waste water every year while consuming a large amount of fresh water. For areas with serious shortage of water resources, the current situation of coal chemical production is not optimistic. The coal chemical wastewater mainly comes from the processes of coal gasification, coal liquefaction, coal coking and the like, and has large water volume, complex water quality, large amount of organic pollutants, phenol, sulfur, ammonia and the like, and large amount of toxic pollutants such as biphenyl, pyridine, indole, quinoline and the like, and high toxicity. With the increasingly prominent environmental problems and the increasingly severe shortage of energy sources, the sewage treatment of coal chemical enterprises becomes the key point of remediation, so that the coal chemical enterprises must optimize the wastewater discharge technology to solve the problems of high water consumption, large wastewater discharge amount and high pollutant concentration content. Under the background, the zero discharge technology of the coal chemical industry wastewater is developed.
The zero discharge of the coal chemical industry wastewater is realized, namely, the wastewater, sewage, clean sewage and the like generated in the coal chemical industry production process are treated and then all recycled, and the wastewater is not discharged to the outside. The zero discharge of the waste water solves the problem of water resource shortage, does not cause pollution and damage to local environment and ecology, and has very important practical significance and profound historical significance for coal chemical engineering projects under construction and proposed construction.
The current situation of zero discharge of coal chemical industry wastewater and the outstanding problems that the process operation cost is high, the standard discharge and the recycling are difficult to reach, the fouling and the scaling of membrane systems are serious, the concentrated brine is concentrated step by step in the multi-process trial stage, the abnormal operation of the system, the set concentrated salt content can not be reached, the evaporation, crystallization and scaling influence the salt discharge of the system and the like occur. The problems cause potential risks of water pollution and seriously affect the healthy and rapid development of the coal chemical industry.
Disclosure of Invention
Therefore, it is necessary to provide a zero-discharge integrated treatment system and method for wastewater in coal chemical industry aiming at the problem of pollution of wastewater after treatment in coal chemical industry.
A coal chemical industry wastewater zero-discharge integrated treatment system comprises an oil removal unit, an air flotation turbidity removal unit, a phenol ammonia recovery unit, a biochemical unit, an ozone catalytic oxidation unit, a hard removal silicon removal unit, an ultrafiltration turbidity removal unit, a membrane method concentration unit and a salt separation crystallization unit which are sequentially connected;
the oil removing unit is used for removing oil in the coal chemical industry wastewater;
the air floatation turbidity removal unit is used for removing suspended matters and colloidal particle substances in the coal chemical wastewater through aeration;
the phenol ammonia recovery unit is used for recovering H2S、NH3And phenols are removed from the coal chemical industry wastewater and recovered;
the biochemical unit and the ozone catalytic oxidation unit are used for removing organic matters in the coal chemical industry wastewater;
the hardness and silicon removal unit is used for reducing hardness in the coal chemical industry wastewater and removing soluble silicon;
the ultrafiltration turbidity removal unit is used for reducing the turbidity in the coal chemical industry wastewater through an ultrafiltration membrane;
the membrane method concentration unit is used for concentrating the produced water of the ultrafiltration turbidity removal unit to obtain recycled water and concentrated water;
and the salt separation crystallization unit is used for separating sodium chloride and sodium sulfate in the concentrated water to obtain a sodium chloride aqueous solution and a sodium sulfate aqueous solution, and crystallizing to obtain sodium chloride crystals, sodium sulfate crystals and reuse water.
In one embodiment, the oil removing unit comprises an oil separation tank, a demulsifying device and an oil-water separator which are connected in sequence.
In one embodiment, the phenol-ammonia recovery unit comprises a stripping tower and a phenol extraction device, wherein the stripping tower comprises a top feeding hole, a middle feeding hole and a discharging hole, and the discharging hole is connected with the phenol extraction device.
In one embodiment, the biochemical unit comprises a homogeneous quantity-equalizing regulation tank, an anaerobic acidification tank and a moving bed biofilm reactor in sequence.
In one embodiment, the coal chemical industry wastewater zero-discharge integrated treatment system comprises a secondary sedimentation tank for carrying out mud-water separation, wherein the secondary sedimentation tank is arranged between the hard-removing and silicon-removing unit and the ultrafiltration and turbidity-removing unit.
In one embodiment, the salt separation and crystallization unit comprises a nanofiltration membrane salt separation device, a first electrodialysis device, a first crystallization device, a second electrodialysis device and a second crystallization device, wherein the nanofiltration membrane salt separation device is provided with a nanofiltration water production outlet and a nanofiltration concentrated water outlet which are sequentially connected with the first electrodialysis device and the first crystallization device and used for separating and crystallizing the sodium chloride aqueous solution; and the nanofiltration concentrated water outlet is sequentially connected with the second electrodialysis device and the second crystallization device and is used for separating and crystallizing the sodium sulfate aqueous solution.
In one embodiment, the inlet of the second electrodialysis device is connected with the nanofiltration membrane salt separation device, the outlet of the second electrodialysis device comprises a second electroosmosis concentrated water outlet and a second electroosmosis produced water outlet, the second electroosmosis produced water outlet is connected with the membrane concentration unit, and the second electroosmosis concentrated water outlet is connected with the second crystallization device.
In one embodiment, the inlet of the first electrodialysis device is connected with the nanofiltration membrane salt separation device, the outlet of the first electrodialysis device comprises a first electroosmosis concentrated water outlet and a first electroosmosis produced water outlet, the first electroosmosis produced water outlet is connected with the membrane concentration unit, and the first electroosmosis concentrated water outlet is connected with the first crystallization device.
In one embodiment, the coal chemical industry wastewater zero-discharge integrated treatment system comprises a reuse water tank, the membrane method concentration unit is provided with a concentrated water outlet and a produced water outlet, the first crystallization device is provided with a first crystallization produced water outlet, the second crystallization device is provided with a second crystallization produced water outlet, and the produced water outlet, the first crystallization produced water outlet and the second crystallization produced water outlet are respectively connected with the reuse water tank.
Zero-discharge integrated treatment method for coal chemical industry wastewater, and zero-discharge integrated treatment method for coal chemical industry wastewaterAn emissions integrated treatment system, the treatment method comprising in sequence: oil removal process, air flotation turbidity removal process and H removal2S、NH3And a phenol process, a biochemical organic matter removal process, an ozone catalytic oxidation process, a hard and silicon removal process, an ultrafiltration turbidity removal process, a membrane concentration process and a salt separation crystallization process.
In one embodiment, the method comprises the step of adjusting the pH of the coal chemical industry waste to 5.5-6.5 before the oil removal process is carried out.
In one embodiment, except for H2S、NH3And the step of the phenolic process comprises:
two feeds of coal chemical industry waste water are respectively fed from the top and the middle of a stripping tower, so that H is obtained2S and NH3Respectively stripping from the stripping tower step by step;
use of an extractant pair for H removal2S and NH3The coal chemical industry wastewater is extracted, so that phenols are separated from the coal chemical industry wastewater into an extraction phase.
The invention provides a coal chemical industry wastewater zero-discharge integrated treatment system and process with reliable technology, economy and stability by combining process sections of an oil removal unit, an air flotation turbidity removal unit, a phenol ammonia recovery unit, a biochemical unit, an ozone catalytic oxidation unit, a hardness removal silicon removal unit, an ultrafiltration turbidity removal unit, a membrane method concentration unit and a salt separation crystallization unit for coal chemical industry terminal wastewater.
Drawings
Fig. 1 is a flow chart of a zero discharge integrated treatment method for coal chemical wastewater according to an embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides a zero-discharge integrated treatment system for coal chemical wastewater, which sequentially comprises an oil removal unit, an air flotation turbidity removal unit, a phenol ammonia recovery unit, a biochemical unit, an ozone catalytic oxidation unit, a hard removal silicon removal unit, an ultrafiltration turbidity removal unit, a membrane method concentration unit and a salt separation crystallization unit;
the oil removing unit is used for removing oil in the coal chemical industry wastewater;
the air floatation turbidity removal unit is used for removing suspended matters and colloidal particle substances in the coal chemical wastewater through aeration;
the phenol ammonia recovery unit is used for recovering H2S、NH3And phenols are removed from the coal chemical industry wastewater and recovered;
the biochemical unit and the ozone catalytic oxidation unit are used for removing organic matters in the coal chemical industry wastewater;
the hardness and silicon removal unit is used for reducing hardness in the coal chemical industry wastewater and removing soluble silicon;
the ultrafiltration turbidity removal unit is used for reducing the turbidity in the coal chemical industry wastewater through an ultrafiltration membrane;
the membrane method concentration unit is used for concentrating the produced water of the ultrafiltration turbidity removal unit to obtain recycled water and concentrated water;
and the salt separation crystallization unit is used for separating sodium chloride and sodium sulfate in the concentrated water to obtain a sodium chloride aqueous solution and a sodium sulfate aqueous solution, and crystallizing to obtain sodium chloride crystals, sodium sulfate crystals and reuse water.
The embodiment of the invention also provides a zero discharge integrated treatment method for the coal chemical industry wastewater, which adopts the zero discharge integrated treatment system for the coal chemical industry wastewater, and the treatment method sequentially comprises the following steps: oil removal process, air flotation turbidity removal process and H removal2S、NH3And a phenol process, a biochemical organic matter removal process, an ozone catalytic oxidation process, a hard and silicon removal process, an ultrafiltration turbidity removal process, a membrane concentration process and a salt separation crystallization process.
The coal chemical industry wastewater zero-discharge integrated treatment system and the method have the following beneficial effects:
1. after the coal chemical industry wastewater zero-discharge integrated treatment system and the method are used for treatment, resources can be recovered, the resources mainly comprise oil, sulfur, phenol, ammonia water, methane, crystalline salt and the like, and the purpose of maximizing the resource recovery is achieved. The treated coal chemical industry end wastewater can be finally and completely reused in a production system, so that the consumption of fresh water by enterprises is reduced, and the operation cost is reduced.
2. After the coal chemical industry wastewater zero-discharge integrated treatment system and the method are used for treatment, pollution can be radically treated, and harmless treatment of the coal chemical industry wastewater is realized. Discharged gas, miscellaneous salt and sludge can be effectively treated, no harmful substance is produced, the environment can be well protected, and the method has obvious social benefit.
3. After the coal chemical industry wastewater zero-discharge integrated treatment system and the method are used for treatment, the coal chemical industry wastewater can be harmlessly and resourcefully treated, and the healthy development of the industry is protected.
The zero discharge integrated treatment system and the treatment method for the coal chemical wastewater are mainly divided into three process sections: a pretreatment process section, a recovery concentration process section and a brine separation process section.
In one embodiment, the coal chemical wastewater of the present invention is mainly coal-to-liquid wastewater.
In some embodiments, the oil removal unit comprises an oil separation tank, a demulsifying device and an oil-water separator which are connected in sequence. The oil in the coal chemical wastewater is mainly tar, the existing form of the tar in the water is related to the emulsifier, water and the properties of the tar, and the tar mainly exists in physical states of floating oil, dispersed oil, emulsified oil, dissolved oil, oil-solid and the like. The system adopts a closed oil separation tank to remove petroleum substances with the density less than 1 in the floating and coarse dispersion states in the wastewater, and the oil separation tank simultaneously has measures of oil collection and sludge discharge. And (3) the wastewater treated by the oil separation tank enters a demulsifying device, a demulsifying agent and a reverse demulsifying agent are added into the demulsifying device, and the demulsified wastewater passes through a high-precision oil-water separator so as to remove residual oil in the wastewater.
In some embodiments, a step of adjusting the pH of the coal chemical industry waste to 5.5-6.5 before performing the oil removal process is included.
The effluent of the oil removal unit enters an air floatation turbidity removal unit to remove suspended matters and colloidal particle substances in the wastewater. The effect of the air floatation method in the pretreatment of the coal chemical wastewater is to carry out the pollutants out along with the gas, thereby achieving the purpose of degrading the pollutants and playing the role of pre-aeration for the subsequent treatment.
Generally, tail-end wastewater of coal chemical enterprises contains H2S、CO2、NH3And harmful substances such as phenol, cyanide, and hydrocarbon. The content of hydrogen sulfide is about 5000mg/L, the content of ammonia nitrogen is about 3000mg/L, and the content of phenol is about 4500 mg/L. The wastewater treated by the air floatation turbidity removal unit enters a phenol-ammonia recovery unit for treatment, the ammonia and the acid gas are respectively separated from the wastewater by utilizing the different solubility of hydrogen sulfide and ammonia in water at different temperatures, and phenols are separated from the wastewater by utilizing an extraction method. In some embodiments, the phenol ammonia recovery unit comprises a stripping column and a phenol extraction plant, the stripping column comprising a top feed port, a middle feed port, and a discharge port, the discharge port being connected to the phenol extraction plant. In some embodiments, except for H2S、NH3And the step of the phenolic process comprises: two feeds of coal chemical industry waste water are respectively fed from the top and the middle of a stripping tower, so that H is obtained2S and NH3Respectively stripping from the stripping tower step by step; use of an extractant pair for H removal2S and NH3The phenol is extracted from the coal chemical industry wastewater to an extraction phase, and is rectified and the likeThe coarse powder and the extractant are recovered by the process, so that most of the extractant flows back to the extraction process section for recycling. In one embodiment, the extractant may be selected from one or more of methyl tert-amyl ether, methyl (iso) propyl ketone, and methyl propyl ketone.
In some embodiments, the biochemical unit comprises, in order, a homogeneous homogenization and equalization conditioning tank, an anaerobic acidification tank, and a moving bed biofilm reactor. Removal of H2S、NH3And after phenol, the wastewater enters a homogeneous uniform regulating tank and then enters a hydrolysis acidification tank, the wastewater enters an anaerobic acidification tank after pH regulation, and the effluent of the anaerobic tank enters a Moving Bed Biofilm Reactor (MBBR). In one embodiment, the nitrified mixed liquid in the aerobic section treated by the MBBR can flow back to the anaerobic acidification tank through internal circulation, and the organic carbon in the raw wastewater is used as an electron donor for denitrification, so that the aim of denitrification is fulfilled. The biochemical unit of the system has stronger impact resistance. In one embodiment, the integrated treatment system for zero discharge of coal chemical wastewater comprises a tubular anaerobic membrane filtering device, wherein the coal chemical wastewater treated by a biochemical unit can be conveyed to the tubular anaerobic membrane filtering device to remove COD in the wastewater, the COD in the wastewater is converted into methane, and the methane can be used as fuel to supplement the energy consumption of the treatment system, so that the purpose of resource output and recovery is achieved; meanwhile, the sludge and the organic matters which are difficult to degrade of the anaerobic device are intercepted through the tubular membrane filtration effect, and the sludge concentration and the COD removal rate of the anaerobic device are ensured.
The ozone catalytic oxidation unit can comprise a catalytic oxidation device, wherein biochemical method is used for removing most of biochemical organic matters, and residual small amount of non-biochemical pollutants are treated by O3Oxidizing to improve the effluent quality. Ozone has a strong oxidizing power and, once dissolved, undergoes two reactions: one is direct oxidation; the other is that under the induction of hydroxyl, hydrogen peroxide, organic matter, humus and high-concentration hydroxyl radical, the other is decomposed into hydroxyl radical, which reacts with benzene ring, -OH, etc. to indirectly oxidize organic matter, microbe, ammonia, etc. to eliminate chroma and partial oxidized organic matter.
Ca contained in coal chemical wastewater2+、Mg2+、Ba2+Scale-forming ions such as soluble silicon, etc., will smooth the membrane systemThe operation brings about a serious influence. In one embodiment, the hardness-removing silicon-removing unit is provided with a hardness-removing silicon-removing agent, a flocculating agent and a coagulant aid, and the hardness-removing silicon-removing agent is matched with the flocculating agent and the coagulant aid to perform hardness-removing silicon-removing treatment on the wastewater, so that the hardness and the content of soluble silicon in the wastewater can be effectively removed. In an embodiment, the de-hardening silicon agent, flocculant, coagulant aid may comprise one or more of lime water, silicon remover, fluorine remover, sodium carbonate, PAC, PFS, PAM, and magnesium.
In some embodiments, the coal chemical industry wastewater zero discharge integrated treatment system comprises a secondary sedimentation tank for performing sludge-water separation, wherein the secondary sedimentation tank is arranged between the hard removal and silicon removal unit and the ultrafiltration and turbidity removal unit. The wastewater after the hard removal and silicon removal treatment sequentially enters a secondary sedimentation tank for filtration and clarification, and the generated sludge is dewatered and then sent out for landfill treatment.
The recycling of the coal chemical wastewater into reverse osmosis membranes and the like has strict requirements on the inlet water turbidity. In one embodiment, the ultrafiltration and turbidity removal unit comprises an ultrafiltration membrane device. In addition, mechanical filtration and an ultrafiltration membrane can be combined, and ultrafiltration turbidity removal is a new turbidity removal process, so that the removal effect of dissolved organic matters, ammonia nitrogen and chlorine disinfection by-product precursors can be improved to a certain extent, and the pollution blockage of a subsequent membrane system is reduced.
The ultrafiltration turbidity-removing produced water enters a membrane method concentration unit. The membrane concentration is an indispensable means for reducing the scale of subsequent evaporation crystallization treatment and reducing the operation cost of zero discharge of wastewater. In one embodiment, the membrane concentration unit comprises a normal pressure reverse osmosis device and a high pressure reverse osmosis device, and is used for concentrating the pretreated ultrafiltration turbidity removal produced water. Under the condition that the salt content of the wastewater is 20000mg/L-50000mg/L, the ultrafiltration produced water directly enters a high-pressure reverse osmosis membrane treatment device for concentration; when the salt content is less than or equal to 20000mg/L, the ultrafiltration produced water enters a normal pressure reverse osmosis device for concentration, and then enters a high pressure reverse osmosis membrane treatment device for concentration.
In some embodiments, the membrane process concentration unit has a concentrate water outlet and a product water outlet. In some embodiments, the salt separation crystallization unit has a concentrate water inlet. The concentrated water outlet of the membrane method concentration unit is connected with the concentrated water inlet of the salt separation crystallization unit. And (3) forming concentrated water by salts such as sodium chloride, sodium sulfate and the like, and entering a salt separation crystallization unit through a concentrated water outlet to perform salt separation crystallization. The desalted produced water enters a reuse water tank through a produced water outlet, and in some embodiments, concentrated water is subjected to chemical softening or resin softening according to hardness before entering a salt separation crystallization unit to remove turbidity.
In some embodiments, the salt separation crystallization unit comprises a nanofiltration membrane salt separation device having a concentrated water inlet, a nanofiltration water outlet, and a nanofiltration concentrated water outlet, a first electrodialysis device, a first crystallization device, a second electrodialysis device, and a second crystallization device. And the nanofiltration membrane salt separation device is used for separating sodium sulfate from sodium chloride, the sodium chloride enters nanofiltration water production, and the sodium sulfate enters nanofiltration concentrated water.
In some embodiments, the nanofiltration water production outlet is connected to the first electrodialysis device and the first crystallization device in sequence for separating and crystallizing the sodium chloride aqueous solution; and the nanofiltration concentrated water outlet is sequentially connected with the second electrodialysis device and the second crystallization device and is used for separating and crystallizing the sodium sulfate aqueous solution. The first electrodialysis device and the second electrodialysis device concentrate the salt-containing water to ensure that the salt content of the water entering the crystallizer is higher, such as more than 100000mg/L, and the investment, treatment scale and operation cost of crystallization are reduced.
In some embodiments, the inlet of the second electrodialysis device is connected with the nanofiltration membrane salt separation device, and the outlet of the second electrodialysis device comprises a second electroosmotic concentrated water outlet and a second electroosmotic water outlet. And the second electroosmosis concentrated water outlet is connected with the second crystallizing device and is used for crystallizing to obtain sodium sulfate crystals and reuse water. And the second electroosmosis produced water outlet is connected with the membrane concentration unit, and electroosmosis produced water flows back into the membrane concentration unit for circular treatment.
In some embodiments, the inlet of the first electrodialysis device is connected with the nanofiltration membrane salt separation device, and the outlet of the first electrodialysis device comprises a first electroosmotic concentrated water outlet and a first electroosmotic water outlet. And the first electroosmosis concentrated water outlet is connected with the first crystallization device and is used for crystallizing to obtain sodium chloride crystals and reuse water. And the first electroosmosis produced water outlet is connected with the membrane concentration unit, and electroosmosis produced water flows back into the membrane concentration unit for circular treatment.
In one embodiment, the first crystallization device is an evaporative crystallizer for evaporative crystallization to form sodium chloride crystals. Sodium chloride crystals with the purity of more than 99.5 percent can be obtained after the crystallization treatment of the salt separation crystallization unit.
In one embodiment, the second crystallizing device comprises a freezing crystallizer and a dehydrating device which are connected in sequence and are used for evaporating and crystallizing to form sodium sulfate crystals. Sodium sulfate crystals with the purity of more than 99 percent can be obtained after the treatment of the salt separation crystallization unit.
In some embodiments, the coal chemical wastewater zero discharge integrated treatment system comprises a reuse water tank. The membrane process concentration unit has a concentrated water outlet and a produced water outlet. The first crystallization device is provided with a first crystallization water production outlet, the second crystallization device is provided with a second crystallization water production outlet, and the water production outlet, the first crystallization water production outlet and the second crystallization water production outlet are respectively connected with the reuse water pool. The water produced by the membrane method concentration unit and the water produced by the first and second crystallization devices are both used as reuse water to flow into a reuse water tank, and the water in the reuse water tank can be directly used in industrial production, such as coal chemical production.
The following are specific examples.
Example (b):
this example uses coal to prepare oil 300m3And taking the wastewater/h as an example, carrying out an application test, carrying out water quality detection after stable operation for 7 days, and carrying out a treatment process by referring to a method shown in figure 1 and the following method. The quality of the inlet and outlet water is shown in Table 1.
S1: firstly, adjusting the pH value of the coal-to-liquid wastewater to about 6, removing coal-to-liquid tar, tar residues, floating oil and suspended matters from the wastewater by using a closed oil separation tank, feeding the wastewater treated by the oil separation tank into a demulsification dosing mixer, adding a demulsifier and a reverse demulsifier to destroy the stability of emulsified oil in water, and feeding the wastewater subjected to demulsification into a high-precision oil-water separator to finish the removal of residual oil in the wastewater.
S2: air is introduced into the wastewater to form micro-bubbles, suspended particles in the wastewater are adhered to the micro-bubbles to form water-gas-particle three-phase mixed gas, and the system floats to the surface to form scum, so that the suspended substances are removed from the wastewater.
S3: the ammonia concentration in the coal chemical industry wastewater is high, and most ammonia exists in a free state, so the recovery of ammonia in the wastewater is mainly steam stripping. The wastewater is divided into two feeds, one of which enters from the top of the stripping tower and the other enters from the middle of the stripping tower. The cold feed at the top of the tower enters the tower to perform mass transfer with the ascending gas, and then the H in the sewage is treated2S and NH3And are removed step by step in two towers respectively. The pH value of the purified water extracted from the tower bottom is about 6, the purified water is weakly acidic, and the purified water enters the subsequent extraction treatment and enters the tower top. The methyl tert-amyl ether as extractant is introduced into the tower still and counter-current extracted with purified water to obtain phenol.
S4: the wastewater treated by the treatment unit enters an anaerobic acidification tank, pH is adjusted, macromolecule nondegradable organic matters in the wastewater can be subjected to ring opening or chain breaking by anaerobic hydrolytic acidification bacteria, and then decomposed into organic matters with smaller molecular weight, toxic substances in the wastewater can be partially degraded, meanwhile, easily-degradable organic matters in the wastewater can provide nutrients such as C, N, P necessary for growth and metabolism of hydrolytic acidification bacteria, and the biodegradability of the wastewater is remarkably improved. Then the wastewater enters a fluidized bed membrane bioreactor (MBBR), nitrate nitrogen and nitrite nitrogen in the wastewater are reduced to generate gaseous nitrogen, meanwhile, the acid production effect in the microbial metabolic reaction promotes some complex compounds with large molecular weight to be converted into organic matters with small molecular weight, and aerobic microorganisms in the wastewater can further degrade the organic matters in the wastewater. And (4) conveying the treated coal chemical wastewater to a tubular anaerobic membrane filtering device to remove COD in the wastewater.
S5: most organic matters can be got rid of to tubular anaerobic membrane filter equipment, but a small amount of non-biochemical pollutant is difficult to get rid of in addition, combine coal chemical industry enterprise's waste water quality of water characteristics, the comprehensive consideration crystal salt quality standard and the economic cost problem of enterprise, introduce new impurity ion in avoiding the system, select ozone catalytic oxidation technique, utilize ozone to produce more peroxidation intermediate product under the catalyst effect and accelerate ozonolysis, the peroxide also has strong oxidizing property and is unselective to the removal of organic matter, and then can degrade the organic matter that independent ozone can't degrade fast, reach the effect of getting rid of aquatic organic matter. Conveying the treated coal chemical wastewater to a tubular membrane anaerobic membrane filtering device, removing COD in the wastewater, converting the COD in the wastewater into methane, and supplementing energy consumption of a treatment system by using the methane as fuel to achieve the purpose of resource output and recovery; meanwhile, the sludge and the organic matters which are difficult to degrade of the anaerobic device are intercepted through the tubular membrane filtration effect, and the sludge concentration and the COD removal rate of the anaerobic device are ensured.
S6: and (3) enabling the wastewater to enter a high-efficiency flocculation sedimentation tank, adjusting the pH value of the wastewater by adding alkali, and adding lime water, a silicon removal agent, a fluorine removal agent, sodium carbonate, PAC, PFS, PAM and a magnesium agent to fully stir and react with the wastewater. In this process, most of Ca in the raw water2+、Mg2+Is removed, and part of HCO is removed by synchronous reaction3 -The effluent is softened and the alkalinity is reduced; while Fe in the wastewater2+、SiO2And the generated precipitate through chemical reaction or the generated precipitate is removed through flocculation and sedimentation, so that the scaling and fouling of a subsequent treatment unit are reduced. The wastewater after the hardness and silicon removal is treated by medium filtration, and chlorine dioxide is introduced into the wastewater for disinfection, so that the wastewater meets the water inlet requirement of a membrane concentration system, and the stable operation of the system is ensured.
S7: most suspended matters in the water can be removed through the treatment unit, but the waste water still contains a small amount of fine suspended matters which cannot be removed, and the membrane system is polluted and blocked due to concentration in a subsequent membrane concentration unit. The process selects a mechanical filtration and ultrafiltration membrane device to treat the wastewater, improves the removal effect of dissolved organic matters, ammonia nitrogen and chlorine disinfection by-product precursors to a certain extent, and reduces the pollution blockage of a subsequent membrane system. The ultrafiltration produced water enters a reverse osmosis system to carry out membrane method step-by-step concentration on the wastewater.
S8: and (3) conveying the treated wastewater to a reverse osmosis device and a high-pressure reverse osmosis device, wherein the salt content of the wastewater is less than 20000mg/L, and the ultrafiltration product water firstly enters the reverse osmosis device for concentration and then enters the high-pressure reverse osmosis membrane treatment device for concentration. And the desalted produced water enters a reuse water tank, and the concentrated water enters a salt separation crystallization unit.
S9: and (3) separating the sodium chloride and the sodium sulfate by feeding the concentrated water of the treatment unit into a refined nanofiltration membrane salt separation device, and feeding the obtained high-purity sodium chloride solution and the sodium sulfate solution into a first electrodialysis device and a second electrodialysis device respectively for concentration so as to ensure that the water salt content of an evaporative crystallization system is more than 100000 mg/L. And (4) returning electrodialysis produced water to a reverse osmosis membrane treatment device for circular treatment, and respectively allowing concentrated water to enter a sodium chloride evaporative crystallization system and a sodium sulfate freezing crystallization system.
S10: sodium chloride waste water is subjected to evaporative crystallization treatment to obtain sodium chloride crystals with the purity of more than 99.5%, frozen crystallization mother liquor is subjected to evaporative crystallization unit to obtain sodium chloride with the purity of more than 99%, the yield of miscellaneous salts is reduced, and sodium sulfate waste water is subjected to frozen crystallization treatment to obtain sodium sulfate crystals with the purity of more than 99%. The produced water is completely recycled to the production system.
TABLE 1 Water quality in and out table
Detecting items Unit of Quality of system inlet water Quality of system effluent
pH value — 6.5-9.5 6.75-7.60
COD mg/L 18000-20000 20-40
TDS mg/L 1200-1600 5-10
HCO3 - mg/L 900-1100 10-30
Ca2+ mg/L 2000-2300 50-80
Mg2+ mg/L 450-500 20-30
NH3-N mg/L 2500-3000 3-5
Total phenols mg/L 4000-5000 0.03-0.1
Oils, their preparation and their use mg/L 1500-2000 0.5-1
SS mg/L 2600-3000 -
Cl- mg/L 5000-6000 30-45
SO4 2- mg/L 2500-3500 10-20
SiO2 mg/L 100-150 1-1.5
As shown in Table 1, by adopting the integrated process of the embodiment of the invention, the effluent can completely meet the water quality requirement of the production water, the purity of the generated sodium chloride can reach the high-grade standard of industrial dry salt in refined industrial salt in GB/T5462-2015 Industrial salt, and the purity of the generated sodium sulfate can reach the I-type standard in GB/T6009-.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. The zero-discharge integrated treatment system for the coal chemical wastewater is characterized by comprising an oil removal unit, an air flotation turbidity removal unit, a phenol ammonia recovery unit, a biochemical unit, an ozone catalytic oxidation unit, a hard removal silicon removal unit, an ultrafiltration turbidity removal unit, a membrane method concentration unit and a salt separation crystallization unit which are sequentially connected;
the oil removing unit is used for removing oil in the coal chemical industry wastewater;
the air floatation turbidity removal unit is used for removing suspended matters and colloidal particle substances in the coal chemical wastewater through aeration;
the phenol ammonia recovery unit is used for recovering H2S、NH3And phenols are removed from the coal chemical industry wastewater and recovered;
the biochemical unit and the ozone catalytic oxidation unit are used for removing organic matters in the coal chemical industry wastewater;
the hardness and silicon removal unit is used for reducing hardness in the coal chemical industry wastewater and removing soluble silicon;
the ultrafiltration turbidity removal unit is used for reducing the turbidity in the coal chemical industry wastewater through an ultrafiltration membrane;
the membrane method concentration unit is used for concentrating the produced water of the ultrafiltration turbidity removal unit to obtain recycled water and concentrated water;
and the salt separation crystallization unit is used for separating sodium chloride and sodium sulfate in the concentrated water to obtain a sodium chloride aqueous solution and a sodium sulfate aqueous solution, and crystallizing to obtain sodium chloride crystals, sodium sulfate crystals and reuse water.
2. The coal chemical industry wastewater zero-discharge integrated treatment system as claimed in claim 1, wherein the oil removal unit comprises an oil separation tank, a demulsifying device and an oil-water separator which are connected in sequence.
3. The coal chemical industry wastewater zero-discharge integrated treatment system as claimed in claim 1, wherein the phenol-ammonia recovery unit comprises a stripping tower and a phenol extraction device, the stripping tower comprises a top feed port, a middle feed port and a discharge port, and the discharge port is connected with the phenol extraction device.
4. The coal chemical industry wastewater zero discharge integrated treatment system of claim 1, wherein the biochemical unit comprises a homogeneous uniform quantity regulating tank, an anaerobic acidification tank and a moving bed biofilm reactor in sequence.
5. The coal chemical industry wastewater zero discharge integrated processing system of claim 1, comprising a secondary sedimentation tank for performing sludge-water separation, wherein the secondary sedimentation tank is arranged between the hard silicon removal unit and the ultrafiltration turbidity removal unit.
6. The coal chemical industry wastewater zero-discharge integrated treatment system as claimed in claim 1, wherein the salt separation and crystallization unit comprises a nanofiltration membrane salt separation device, a first electrodialysis device, a first crystallization device, a second electrodialysis device and a second crystallization device, the nanofiltration membrane salt separation device is provided with a nanofiltration water production outlet and a nanofiltration concentrated water outlet, and the nanofiltration water production outlet is connected with the first electrodialysis device and the first crystallization device in sequence and used for separating and crystallizing the sodium chloride aqueous solution; and the nanofiltration concentrated water outlet is sequentially connected with the second electrodialysis device and the second crystallization device and is used for separating and crystallizing the sodium sulfate aqueous solution.
7. The coal chemical industry wastewater zero-discharge integrated treatment system as claimed in claim 6, wherein the inlet of the second electrodialysis device is connected with the nanofiltration membrane salt separation device, the outlet of the second electrodialysis device comprises a second electroosmosis concentrated water outlet and a second electroosmosis produced water outlet, the second electroosmosis produced water outlet is connected with the membrane concentration unit, and the second electroosmosis concentrated water outlet is connected with the second crystallization device.
8. The coal chemical industry wastewater zero-discharge integrated treatment system as claimed in claim 6, wherein the inlet of the first electrodialysis device is connected with the nanofiltration membrane salt separation device, the outlet of the first electrodialysis device comprises a first electroosmosis concentrated water outlet and a first electroosmosis produced water outlet, the first electroosmosis produced water outlet is connected with the membrane concentration unit, and the first electroosmosis concentrated water outlet is connected with the first crystallization device.
9. The coal chemical industry wastewater zero discharge integrated processing system according to claim 6, comprising a reuse water tank, wherein the membrane concentration unit has a concentrated water outlet and a produced water outlet, the first crystallization device has a first crystallized produced water outlet, the second crystallization device has a second crystallized produced water outlet, and the produced water outlet, the first crystallized produced water outlet and the second crystallized produced water outlet are respectively connected with the reuse water tank.
10. A zero discharge integrated treatment method for wastewater in coal chemical industry, which is characterized in that the zero discharge integrated treatment system for wastewater in coal chemical industry as claimed in any one of claims 1 to 9 is adopted, and the treatment method sequentially comprises the following steps: oil removal process, air flotation turbidity removal process and H removal2S、NH3And a phenol process, a biochemical organic matter removal process, an ozone catalytic oxidation process, a hard and silicon removal process, an ultrafiltration turbidity removal process, a membrane concentration process and a salt separation crystallization process.
11. The coal chemical industry wastewater zero-discharge integrated treatment method as claimed in claim 10, comprising the step of adjusting the pH of the coal chemical industry wastewater to 5.5-6.5 before the oil removal process.
12. The coal chemical industry wastewater zero-discharge integrated treatment method as claimed in claim 10, characterized in that H is removed2S、NH3And the step of the phenolic process comprises:
two feeds of coal chemical industry waste water are respectively fed from the top and the middle of a stripping tower, so that H is obtained2S and NH3Respectively stripping from the stripping tower step by step;
use of an extractant pair for H removal2S and NH3The coal chemical industry wastewater is extracted, so that phenols are separated from the coal chemical industry wastewater into an extraction phase.
CN202010782263.8A 2020-08-06 2020-08-06 Coal chemical industry wastewater zero-discharge integrated treatment system and method Pending CN111875180A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010782263.8A CN111875180A (en) 2020-08-06 2020-08-06 Coal chemical industry wastewater zero-discharge integrated treatment system and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010782263.8A CN111875180A (en) 2020-08-06 2020-08-06 Coal chemical industry wastewater zero-discharge integrated treatment system and method

Publications (1)

Publication Number Publication Date
CN111875180A true CN111875180A (en) 2020-11-03

Family

ID=73211828

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010782263.8A Pending CN111875180A (en) 2020-08-06 2020-08-06 Coal chemical industry wastewater zero-discharge integrated treatment system and method

Country Status (1)

Country Link
CN (1) CN111875180A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590975A (en) * 2022-04-06 2022-06-07 成都硕特科技股份有限公司 Zero-discharge treatment method and treatment system for phenol-containing coal gas wastewater
CN115057582A (en) * 2022-06-19 2022-09-16 中石化石油工程技术服务有限公司 Process and device for reducing drilling wastewater treatment cost
CN115196836A (en) * 2022-08-02 2022-10-18 达斯玛环境科技（北京）有限公司 Method and system for treating coal gasification industrial grey water

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102887596A (en) * 2011-12-20 2013-01-23 辽宁华孚环境工程有限公司 Method and device for treating oil-containing emulsified wastewater or waste emulsion
CN104230124A (en) * 2014-09-30 2014-12-24 深圳能源资源综合开发有限公司 Coal chemical industry wastewater zero emission technology and special equipment thereof
CN104250050A (en) * 2013-06-26 2014-12-31 李相昆 Application of A/MBBR/A to nitrogen and phosphorus removal of municipal sewage with low carbon-nitrogen ratio
CN104478173A (en) * 2014-12-22 2015-04-01 新疆环境工程技术有限责任公司 Wastewater treatment and recycling integrated treatment process for coal chemical enterprise
CN105217872A (en) * 2015-11-06 2016-01-06 北京沃特尔水技术股份有限公司 A kind for the treatment of process of coal chemical industrial waste water
CN105502782A (en) * 2015-12-07 2016-04-20 湖南湘牛环保实业有限公司 Technology for recovering water resources and salt from coking wastewater in coal chemical industry
CN106116011A (en) * 2016-01-18 2016-11-16 中煤鄂尔多斯能源化工有限公司 A kind of coal chemical wastewater treating technique
CN108128969A (en) * 2017-12-19 2018-06-08 德蓝水技术股份有限公司 A kind of five embrane method combined treatment integrated approaches for coal chemical industry wastewater zero emission

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102887596A (en) * 2011-12-20 2013-01-23 辽宁华孚环境工程有限公司 Method and device for treating oil-containing emulsified wastewater or waste emulsion
CN104250050A (en) * 2013-06-26 2014-12-31 李相昆 Application of A/MBBR/A to nitrogen and phosphorus removal of municipal sewage with low carbon-nitrogen ratio
CN104230124A (en) * 2014-09-30 2014-12-24 深圳能源资源综合开发有限公司 Coal chemical industry wastewater zero emission technology and special equipment thereof
CN104478173A (en) * 2014-12-22 2015-04-01 新疆环境工程技术有限责任公司 Wastewater treatment and recycling integrated treatment process for coal chemical enterprise
CN105217872A (en) * 2015-11-06 2016-01-06 北京沃特尔水技术股份有限公司 A kind for the treatment of process of coal chemical industrial waste water
CN105502782A (en) * 2015-12-07 2016-04-20 湖南湘牛环保实业有限公司 Technology for recovering water resources and salt from coking wastewater in coal chemical industry
CN106116011A (en) * 2016-01-18 2016-11-16 中煤鄂尔多斯能源化工有限公司 A kind of coal chemical wastewater treating technique
CN108128969A (en) * 2017-12-19 2018-06-08 德蓝水技术股份有限公司 A kind of five embrane method combined treatment integrated approaches for coal chemical industry wastewater zero emission

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
全国勘察设计注册工程师环保专业管理委员会 等: "《注册环保工程师专业考试复习教材 水污染防治工程技术与实践》", 31 March 2017, 中国环境出版社 *
李小明 等: "《部队急进高原卫生防病指南》", 30 September 2014, 人民军医出版社 *
梁吉艳等: "《环境工程学》", 31 October 2014, 中国建材工业出版社 *
武汉水利电力学院电厂化学教研室: "《热力发电厂水处理 上册 修订本》", 31 December 1987, 水利电力出版社 *
赵通林: "《浮选》", 31 August 2018, 冶金工业出版社 *
陈观文 等: "《分离膜应用与工程案例》", 30 November 2007, 国防工业出版社 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590975A (en) * 2022-04-06 2022-06-07 成都硕特科技股份有限公司 Zero-discharge treatment method and treatment system for phenol-containing coal gas wastewater
CN115057582A (en) * 2022-06-19 2022-09-16 中石化石油工程技术服务有限公司 Process and device for reducing drilling wastewater treatment cost
CN115057582B (en) * 2022-06-19 2024-03-05 中石化石油工程技术服务有限公司 Process and device for reducing drilling and production wastewater treatment cost
CN115196836A (en) * 2022-08-02 2022-10-18 达斯玛环境科技（北京）有限公司 Method and system for treating coal gasification industrial grey water

Similar Documents

Publication Publication Date Title
CN103288309B (en) Coal gasification wastewater zero-emission treatment method, and application thereof
CN102452750B (en) Method for oil refinery sewage classification control and grading treatment
CN111875180A (en) Coal chemical industry wastewater zero-discharge integrated treatment system and method
CN104276711A (en) Reverse osmosis membrane treatment process for recycling industrial sewage and realizing zero release
CN105481168B (en) Coal gasification wastewater integrated conduct method
CN107032561A (en) A kind of coal chemical industry wastewater zero emission treatment method and system
CN105565581B (en) Coal ethylene wastewater integrated conduct method
CN102167477A (en) Recycle system and recycle method of coked wastewater
CN107739124B (en) Zero-discharge treatment method for coking wastewater
CN105330110A (en) Direct coal liquefaction sewage treatment system and method
CN102616987A (en) System and method for treatment and recycling of coking phenol-cyanogen wastewater
CN114105412A (en) Method for integrally treating coking wastewater
CN108117223B (en) Zero-discharge treatment method for salt-containing wastewater
CN205328797U (en) Direct liquefaction of coal sewage treatment system
CN110342740B (en) Method and system for purifying organic wastewater containing salt
CN110563232A (en) Mineral recovery and zero discharge process for high-salinity high-organic-matter wastewater
CN113072228A (en) Method and system for treating salt-containing wastewater
CN206033470U (en) High salt sewage treatment system
CN114075011B (en) Treatment method and system for clean wastewater of coal-to-methanol process
CN214457507U (en) Tar deep-processing wastewater recycling treatment system
CN115340253A (en) Zero-discharge treatment system and treatment method for coking wastewater
CN210419644U (en) Contain clean system of salt organic waste water
CN113912251A (en) Treatment process of high-concentration degradation-resistant pickling wastewater
CN114906973A (en) Coking sewage advanced treatment zero-discharge process
CN112707593A (en) Synthetic ammonia wastewater treatment system and treatment method

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
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20201103