CN111348803A - High-difficulty wastewater treatment method and device with zero concentrated solution and zero solid waste - Google Patents

High-difficulty wastewater treatment method and device with zero concentrated solution and zero solid waste Download PDF

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CN111348803A
CN111348803A CN202010206031.8A CN202010206031A CN111348803A CN 111348803 A CN111348803 A CN 111348803A CN 202010206031 A CN202010206031 A CN 202010206031A CN 111348803 A CN111348803 A CN 111348803A
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王惠丰
王富民
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Aiximu Liaoning Environmental Technology Co ltd
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    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • C—CHEMISTRY; METALLURGY
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    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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    • 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
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
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    • C02F2101/30—Organic compounds
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    • 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
    • C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
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Abstract

A method and a device for treating high-difficulty wastewater with zero concentrated solution and zero solid waste, belonging to the field of high-difficulty wastewater treatment. The method is to carry out biochemical treatment and LROT treatment on high-difficulty wastewater, and discharge the water reaching the standard; adding coagulant into the obtained organic concentrated waste liquid, concentrating the concentrated solution for the second time to obtain high-concentration concentrated solution, spray drying with hot air,the obtained tail gas is used for drying sludge generated after biological treatment, and the spray-dried organic matter and the dried sludge after sludge treatment are subjected to incineration treatment to obtain CO2+H2And O. The device comprises a biochemical treatment unit, an LROT treatment unit, a sludge drying unit, a secondary concentration unit, a spray drying unit and an incineration unit; the method reduces equipment investment and operation cost on the basis of ensuring that all indexes are superior to the industrial standard, does not generate concentrated water discharge or concentrated water crystallization, can fully utilize the discharged pollutants as resources, saves a large amount of energy and has obvious economic advantages.

Description

High-difficulty wastewater treatment method and device with zero concentrated solution and zero solid waste
Technical Field
The invention relates to the field of water treatment, in particular to the field of high-difficulty wastewater treatment, and particularly relates to a high-difficulty wastewater treatment device and method with zero concentrated solution and zero solid waste.
Background
With the development of economy and increase of the number of cities in China, the development of various industries obtains remarkable results. However, with the increasingly strict national water resource management system, the control of waste water in industries such as landfill leachate, coal chemical industry waste water, pharmaceutical waste water and the like is receiving wide attention. The industrial wastewater belongs to high-difficulty wastewater, wherein the landfill leachate belongs to high-concentration refractory organic wastewater and has the characteristics of complex components, high pollutant concentration, unbalanced biological nutrition proportion, high chromaticity, large odor and poor biodegradability; the coal chemical wastewater is typical high-difficulty industrial wastewater, is derived from coal coking, coal gasification, coal liquefaction and other coal gasification processes, has complex components, mainly comprises phenols, ammonia nitrogen, cyanides and other toxic and harmful substances, and has great harm to people and environment. Therefore, the treatment of high-difficulty waste water is always faced with some technical difficulties which are difficult to solve.
At present, the core of the traditional treatment process for high-difficulty wastewater is a membrane treatment technology, and the main process flow is shown in figure 1:
as shown in the flow chart of fig. 1, the high-difficulty wastewater is subjected to biochemical treatment, the biochemical tail water enters tubular ultrafiltration, and then enters Reverse Osmosis (RO) after being subjected to Nanofiltration (NF) separation, and the effluent reaches the standard and is discharged.
However, because the traditional treatment process adopts a membrane process, a certain amount of concentrated solution is necessarily generated. The concentrated solution contains a large amount of organic matters which are difficult to degrade, ammonia nitrogen, total nitrogen, high-valence salt and the like, and can greatly influence the environment and a biochemical treatment system. The problem of concentrate becomes a bottleneck in the use of membrane technology.
At present, in the membrane treatment process of high-difficulty wastewater, the treatment mode of the generated concentrated solution faces the following problems:
(1) the concentrated solution is directly returned to a biochemical system. In the prior art, concentrated solution is usually directly returned to a biochemical treatment system, and the concentrated solution contains a large amount of humic acid which is difficult to degrade biochemically in the system and can be gradually accumulated, thereby finally influencing the treatment capacity of the whole treatment system.
(2) In waste incineration plants, large volumes of concentrate are usually subjected to back-spray incineration. However, in the back-spraying incineration process, not only the heat energy loss is large, but also great corrosion can be caused to the incineration equipment, the service life of the incineration equipment is shortened, the overhaul cost of the furnace body is increased, and great economic loss can be caused to the incineration plant by the mode.
(3) And (5) carrying out chemical oxidation treatment on the concentrated solution. Some enterprises use chemical oxidation methods, such as ozone oxidation and catalytic oxidation, to treat the concentrated solution. The method has the advantages of high humic acid treatment speed and high humic acid treatment efficiency, and the products (carbon dioxide and water) do not pollute the environment, but have large medicament consumption and high cost.
(4) Evaporating and crystallizing to process the concentrated solution. The evaporation process is thorough in treatment, can directly form most of pollutants into crystals, and is convenient to operate and stable in operation. However, this process requires a solution to the problem of corrosion fouling of the evaporator and is relatively expensive to operate.
(5) And (5) carrying out wet catalytic oxidation treatment on the concentrated solution. When the wet catalytic oxidation technology is used for treatment, the operation cost is low, energy recovery can be carried out, the treatment efficiency is high, the treated waste liquid can be returned to a biochemical system for biochemical treatment, but the investment cost is high, the treatment effect is unstable, and the possibility of ammonia nitrogen exceeding is high.
Disclosure of Invention
The invention provides a high-difficulty wastewater treatment method and device with zero concentrated solution and zero solid waste, aiming at the defects of the existing high-difficulty wastewater treatment process. The method reduces equipment investment and operation cost on the basis of ensuring that all indexes are superior to industrial standards such as ' domestic garbage landfill pollution control standard ' (GB16889-2008) ' coking chemical industry pollutant emission standard ' (GB16171-2012) ' chemical synthesis pharmaceutical industry water pollutant emission standard ' (GB21904-2008) ', and the like, does not generate the problem of concentrated water emission or concentrated water crystallization, can fully utilize discharged pollutants generated by the conventional process as resources, saves a large amount of energy, and has great technical and economic advantages compared with the traditional membrane process.
The invention relates to a high-difficulty wastewater treatment method with zero concentrated solution and zero solid waste, which comprises the following steps:
step 1: biochemical treatment
Performing biochemical treatment on the high-difficulty wastewater, and removing degradable organic matters, ammonia nitrogen and total nitrogen in the high-difficulty wastewater through anaerobic, aerobic, nitrification-denitrification processes to obtain biochemically treated biochemical tail water;
step 2: LROT processing
Carrying out LROT treatment on the biochemical tail water after biochemical treatment to obtain standard water discharge meeting the national discharge standard;
the LROT treatment is that the biochemical tail water after biochemical treatment is subjected to filtration, resin adsorption and electrocatalytic oxidation treatment;
carrying out resin regeneration treatment on saturated resin after resin adsorption, and carrying out alkali recovery treatment on alkali liquor generated in the resin regeneration treatment process to generate organic concentrated waste liquor;
and step 3: second concentration
Adding a coagulant into the organic concentrated waste liquid, and uniformly stirring to ensure that organic matters in the organic concentrated waste liquid and the coagulant fully react to obtain a concentrated solution;
carrying out secondary concentration treatment on the concentrated solution, carrying out high concentration to obtain a high-concentration concentrated solution and clear solution, and refluxing the clear solution for carrying out LROT treatment again;
and 4, step 4: spray drying
Carrying out spray drying treatment on the high-concentration concentrated solution, and fully contacting with high-temperature hot air to obtain dried organic matters and generate tail gas;
and 5: sludge drying
The tail gas discharged after the spray drying treatment can be used for carrying out sludge drying treatment on excess sludge generated after biological treatment to obtain dried sludge;
step 6: incineration of
The burning treatment is carried out on the dried organic matters and the dried sludge, and CO is finally formed after the burning treatment because the main component of the sludge is humic acid organic matters2+H2O。
In the step 1, the high-difficulty wastewater is one of landfill leachate, coal chemical wastewater or pharmaceutical wastewater.
In the step 2, the filtration is one of coagulation filtration, cartridge filter and tubular ultrafiltration.
In the resin adsorption, the resin is one of macroporous polystyrene or poly-phenolic resin, and the adsorption volume multiplying power is 100-150 times; the resin adsorption filtration rate is set to be 2-5 BV/h according to the COD value of the filtered biochemical tail water.
In the electrocatalytic oxidation, the current density can be set to be 50-200 mA/cm according to the COD value of the resin adsorbed effluent2And after electrolysis, stirring and reacting for 1-2 h.
The resin regeneration process parameters are as follows: the regeneration liquid is 2 wt.% to 4 wt.% of sodium hydroxide aqueous solution, and the regeneration liquid comprises the following components in percentage by volume: (3-5): 1, setting the regeneration filtering speed to be 1-3 BV/h;
the alkali recovery is nanofiltration membrane alkali recovery, the alkalinity can be recovered by 80%, the recovered alkali liquor flows back to carry out resin regeneration, and the obtained organic concentrated waste liquid is subjected to subsequent treatment.
In the step 3, the coagulant is one or more of Fe oxide, Co oxide, Ni oxide, Cu oxide and Zn oxide, or one or more of Fe salt, Co salt, Ni salt, Cu salt and Zn salt, or a mixture of one or more of Fe oxide, Co oxide, Ni oxide, Cu oxide and Zn oxide and C; such as Cu (NO)3)3A composite oxide of CuO-C (CuO: C: 1:19, in molar ratio) and Fe-Co (Fe: Co: 1:2, in molar ratio). Wherein, the adding amount of the coagulant is determined according to the COD content of the concentrated solution and the type of the coagulant.
In the step 3, the time for stirring evenly is preferably 10-15min,
in the step 3, the COD concentration in the high-concentration concentrated solution can be concentrated to be more than 100000 mg/L.
In the step 4, the spray drying treatment comprises the following steps: pumping the high-concentration concentrated solution into an atomizer in a spray drying unit through a feed pump, spraying the high-concentration concentrated solution into a drying tower through the atomizer, fully contacting high-temperature hot air in the drying tower with the atomized concentrated solution, vaporizing and evaporating water in the high-concentration concentrated solution, recovering organic condensate contained in the high-concentration concentrated solution through a primary dust collector and a secondary dust collector to obtain dried organic matters, introducing the generated hot air into a wet dust collector through an induced draft fan, further filtering out solid particles contained in the air, and conveying the solid particles by the fan for discharging to form tail gas;
in the step 4, the temperature in the drying tower is 150-220 ℃;
the water content of the dried organic matters is 5% +/-1%.
In the step 6, the hot air generated by the burning unit passes through the air exhaust chamber of the furnace, is conveyed by the fan to be discharged outside, is sent to the spray drying unit and serves as heat energy required to be consumed during drying.
In order to realize the high-difficulty wastewater treatment of the zero concentrated solution and the zero solid waste, a high-difficulty wastewater treatment device of the zero concentrated solution and the zero solid waste is adopted, and comprises a biochemical treatment unit, an LROT treatment unit, a sludge drying unit, a secondary concentration unit, a spray drying unit and an incineration unit;
the biochemical treatment unit is provided with a water inlet of high-difficulty wastewater, a water outlet of the biochemical treatment unit is connected with a water inlet of the LROT treatment unit, the LROT treatment unit is provided with a standard water discharge port and an organic concentrated waste liquid discharge port, the organic concentrated waste liquid discharge port of the LROT treatment unit is connected with the secondary concentration unit, a high-concentration concentrated liquid outlet of the secondary concentration unit is connected with the spray drying unit, and a dried organic matter outlet of the spray drying unit is connected with the incineration unit.
Furthermore, the secondary concentration unit is provided with a clear liquid outlet, and the clear liquid outlet of the secondary concentration unit is connected with the water inlet of the LROT processing unit through a pipeline.
Furthermore, a residual sludge outlet of the biochemical treatment unit is connected with the sludge drying unit, and a dried sludge outlet of the sludge drying unit is connected with the incineration unit.
Furthermore, a hot air outlet of the incineration unit is connected with a spray drying unit, and a tail gas outlet of the spray drying unit is connected with a sludge drying unit.
Furthermore, the LROT processing unit is a Low cost Refractory organic Treatment process, the Chinese full text is a Low cost Refractory organic Treatment process, and the LROT processing unit is a non-membrane method, Low cost high difficulty wastewater Treatment technology and comprises a filtering subunit, a resin adsorption subunit, an electrocatalytic oxidation subunit, a resin regeneration subunit and an alkali recovery subunit, wherein the filtering subunit, the resin adsorption subunit and the electrocatalytic oxidation subunit are sequentially connected, and the electrocatalytic oxidation subunit is provided with a standard water discharge port; the resin adsorption subunit is provided with a resin regeneration subunit and an alkali recovery subunit bypass, the alkali recovery subunit is provided with an alkali liquor recovery outlet and an organic concentrated waste liquor discharge port, the alkali liquor recovery outlet of the alkali recovery subunit is connected with the front end of the resin regeneration subunit, and the organic concentrated waste liquor discharge port is connected with the secondary concentration unit through a pipeline provided with a coagulant.
Further, the secondary concentration unit adopts a material membrane.
Further, the spray drying unit mainly comprises an atomizer, a drying tower, a first-stage dust collector, a second-stage dust collector and a wet dust collector, the atomizer is arranged in the drying tower, the first-stage dust collector and the second-stage dust collector are sequentially connected to the bottom of the drying tower, and a gas outlet of the second-stage dust collector is connected with the wet dust collector through an induced draft fan.
Furthermore, the incineration unit comprises an incinerator and a grate air chamber, wherein the grate air chamber is arranged at the upper part of the incinerator.
Compared with the prior art, the high-difficulty wastewater treatment device and method with zero concentrated solution and zero solid waste have the advantages that:
(1) the method of the invention has no discharge of concentrated solution and solid waste on the premise of ensuring that the effluent quality is stable and meets the discharge standards of various industries, and solves the problems of poor stability, high energy consumption, high treatment cost and easy corrosion of traditional technologies such as simple incineration, evaporation-crystallization and the like;
(2) compared with the conventional spray drying technology, the technology adopts the coagulant, improves the effect of the material membrane on continuously concentrating the organic matters in the concentrated solution, and can improve the COD concentration in the secondary concentrated solution from 50000-60000mg/L to 100000 mg/L. The volume of the concentrated solution is reduced, the organic matters are fully enriched, and the energy consumption and the operating cost of spray drying are reduced.
(3) The tail gas discharged by spray drying can be used for drying excess sludge in biochemical treatment, and the dried sludge and hot air generated during the incineration of dried organic matters can be reused in a spray drying system. The energy is fully utilized in such a circulating way, the operation cost of the whole process is reduced, and the method has great technical and economic advantages compared with the traditional technology.
Drawings
FIG. 1 is a schematic view of a conventional membrane treatment process for high-difficulty wastewater;
FIG. 2 is a schematic flow diagram of a process for treating highly difficult waste water with zero concentrate and zero solid waste;
FIG. 3 is a schematic view of a high-difficulty wastewater treatment apparatus with zero concentrated solution and zero solid waste;
wherein, 1 is a biochemical treatment unit, 2 is an LROT treatment unit, 3 is a secondary concentration unit, 4 is a sludge drying unit, 5 is a spray drying unit, and 6 is an incineration unit;
a is high-difficulty wastewater, B is standard water, C is concentrated solution, D is dried organic matter, E is clear liquid, F is excess sludge, G is dried sludge, H is CO2And H2O and K are coagulants, M is hot air, and N is tail gas;
FIG. 4 is a schematic diagram of an LROT processing unit;
in the figure, I is a filtering subunit, II is a resin adsorption subunit, III is an electrocatalytic oxidation subunit, IV is a resin regeneration subunit, and V is an alkali recovery subunit.
FIG. 5 is a schematic diagram of the structure of a spray drying unit used;
in the drawing, 501 denotes a filter, 502 denotes a blower, 503 denotes a heater, 504 denotes a trough, 505 denotes a feed pump, 506 denotes an atomizer, 507 denotes a drying tower, 508 denotes a primary dust collector, 509 denotes a secondary dust collector, 510 denotes an induced draft fan, and 511 denotes a wet dust collector.
Detailed Description
The present invention will be described in further detail with reference to examples.
In this embodiment, 2017111728586 a process apparatus and method for treating landfill leachate by a non-membrane method is adopted in the LROT treatment unit process.
Example 1
A high-difficulty wastewater treatment device with zero concentrated solution and zero solid waste has a structural schematic diagram shown in figure 3, and comprises a biochemical treatment unit 1, an LROT treatment unit 2, a sludge drying unit 4, a secondary concentration unit 3, a spray drying unit 5 and an incineration unit 6;
the LROT treatment unit of the embodiment has a schematic structural diagram shown in fig. 4, and mainly comprises a filtering subunit I, a resin monkshood absorbing unit II, an electrocatalytic oxidation subunit III, a resin regeneration subunit IV, and an alkali recovery subunit V, wherein the filtering subunit I, the resin monkshood absorbing unit II, and the electrocatalytic oxidation subunit III are connected in sequence, and the electrocatalytic oxidation subunit III is provided with a standard water discharge port; the resin absorption aconite unit II is connected with a resin regeneration subunit IV and an alkali recovery subunit V bypass, the alkali recovery subunit V is provided with an alkali liquor recovery outlet and an organic concentrated waste liquor discharge port, the alkali liquor recovery outlet of the alkali recovery subunit V is connected with the front end of the resin regeneration subunit, and the organic concentrated waste liquor discharge port is connected with a secondary concentration unit through a pipeline provided with a coagulant.
The secondary concentration unit of this example employs a feed membrane.
The spray drying unit V of this embodiment, a schematic structural diagram of which is shown in fig. 5, mainly includes an atomizer 506, a drying tower 507, a primary dust collector 508, a secondary dust collector 509, and a wet dust collector 510, the atomizer 506 is disposed in the drying tower 507, the primary dust collector 508 and the secondary dust collector 509 are sequentially connected to the bottom of the drying tower 507, and a gas outlet of the secondary dust collector 509 is connected to the wet dust collector 511 through an induced draft fan 510.
The biochemical treatment unit 1 is provided with a water inlet for high-difficulty wastewater, a water outlet of the biochemical treatment unit 1 is connected with a water inlet of the LROT treatment unit 2, the LROT treatment unit 2 is provided with a standard water discharge port and an organic concentrated waste liquid discharge port, the organic concentrated waste liquid discharge port of the LROT treatment unit is connected with the secondary concentration unit 3 through a pipeline provided with a coagulant addition port, a high-concentration concentrated liquid outlet of the secondary concentration unit 3 is connected with the spray drying unit 5, and a dried organic matter outlet of the spray drying unit 5 is connected with the incineration unit 6;
wherein, the secondary concentration unit 3 is provided with a clear liquid outlet, and the clear liquid outlet of the secondary concentration unit 3 is connected with the water inlet of the LROT processing unit 2 through a pipeline;
the residual sludge outlet of the biochemical treatment unit 1 is connected with the sludge drying unit 4, and the dried sludge outlet of the sludge drying unit 4 is connected with the incineration unit 6.
The hot air outlet of the incineration unit 6 is connected with the spray drying unit 5, and the tail gas outlet of the spray drying unit 5 is connected with the sludge drying unit 4.
In this embodiment, the above apparatus is adopted, and the adopted high-difficulty wastewater is landfill leachate, and the high-difficulty wastewater treatment method for zero concentrated solution and zero solid waste is performed, and the process flow schematic diagram is shown in fig. 2, and includes the following steps:
step 1: biochemical treatment
The high-difficulty wastewater A enters a biochemical treatment unit 1, and is subjected to anaerobic, aerobic, nitrification-denitrification processes through the biochemical treatment unit 1 to remove degradable organic matters, ammonia nitrogen and total nitrogen in the high-difficulty wastewater A, so as to obtain biochemically treated biochemical tail water; wherein, the effluent standard is shown in table 1.
Step 2: LROT processing
Feeding the biochemically treated biochemical tail water into an LROT treatment unit for coagulation filtration, resin adsorption and electrocatalytic oxidation treatment to obtain standard water B which reaches the national discharge standard;
wherein, in the resin adsorption, the resin is one of macroporous polystyrene resin, and the adsorption volume multiplying power is 120 times; the resin adsorption filtration rate is set to be 3BV/h according to the COD value of the filtered biochemical tail water.
In electrocatalytic oxidation, water is adsorbed according to the resinThe COD value is set to 100mA/cm of current density2After electrolysis, the reaction was stirred for 1 hour.
Carrying out resin regeneration treatment on saturated resin after resin adsorption, and carrying out alkali recovery treatment on alkali liquor generated in the resin regeneration treatment process to generate organic concentrated waste liquor;
the resin regeneration process parameters are as follows: the regeneration liquid is 3 wt.% sodium hydroxide aqueous solution, and the regeneration liquid comprises the following components in percentage by volume: resin 4: 1, setting the regeneration filtering speed to be 2 BV/h;
and when the alkali recovery is the nanofiltration membrane alkali recovery, the alkalinity can be recovered by 80%, and the recovered alkali liquor flows back to carry out resin regeneration to obtain the organic concentrated waste liquid.
The effluent standards at the LROT treatment unit are shown in table 1.
And step 3: second concentration
Adding a coagulant K into the organic concentrated waste liquid, and stirring for 10min to ensure that organic matters in the organic concentrated waste liquid fully react with the coagulant to obtain a concentrated liquid C; wherein the coagulant K is a mixture of CuO-C, and the molar ratio of CuO: c is 1: 19;
the concentrated solution C enters a secondary concentration unit 3 for high concentration to obtain high-concentration concentrated solution and clear solution, and the clear solution E flows back to the front end of the LROT processing unit for LROT processing;
the COD concentration in the obtained high-concentration concentrated solution can be concentrated to 100000 mg/L.
And 4, step 4: spray drying
Pumping the high-concentration concentrated solution into an atomizer 506 in the spray drying unit 5 through a feed pump, spraying the high-concentration concentrated solution into a drying tower 507 through the atomizer 506, controlling the temperature in the drying tower 507 to be 200 ℃, fully contacting high-temperature hot air in the drying tower 507 with the atomized concentrated solution, vaporizing and evaporating the water of the high-concentration concentrated solution, recovering organic condensate contained in the high-concentration concentrated solution through a first-stage dust collector 508 and a second-stage dust collector 509 to obtain dried organic matter D, controlling the water content of the dried organic matter D to be 5%, and enabling the generated hot air to enter a wet dust collector 511 through an induced draft fan 510 to further filter solid particles contained in the air and be discharged outside through the fan to form tail gas N;
the spray drying unit of this example consumed an average of 1.75kW per kg of high concentrate, with 1.5kW for thermal energy and 0.25kW for mechanical energy.
And 5: sludge drying
Tail gas N discharged by the spray drying unit 5 enters the sludge drying unit 4, and residual sludge F generated by a biological treatment unit at the front end of the sludge drying unit 4 can be dried to obtain dried sludge G;
step 6: incineration of
The dried organic matter D and the dried sludge G enter the incineration unit 6, and CO is finally formed after incineration treatment because the main component of the dried organic matter D and the dried sludge G are humic acid organic matter2+H2O。
The hot air M generated by the burning unit 6 passes through the air exhaust chamber of the furnace, is conveyed by the fan to be discharged outside, and is sent to the spray drying unit 5 to serve as heat energy required to be consumed during drying.
Through the treatment of the scheme, the discharge of standard water and the formed CO are formed in the process of treating high-difficulty wastewater2And H2And O, other intermediate products are recycled, and no concentrated solution or solid waste is discharged.
In the treatment process, the coagulant is added, so that the effect of the material membrane on the continuous concentration of the organic matters in the concentrated solution is improved, and the COD concentration in the secondary concentrated solution is improved from 50000-60000mg/L to 100000 mg/L.
Table 1 main process inlet and outlet water quality:
Figure BDA0002421149070000081

Claims (9)

1. a high-difficulty wastewater treatment method with zero concentrated solution and zero solid waste is characterized in that the high-difficulty wastewater is subjected to biochemical treatment in the step 1 and LROT treatment in the step 2 in sequence to obtain standard water discharge meeting the national discharge standard, and organic concentrated waste liquid generated in the LROT treatment is subjected to subsequent treatment;
the method is characterized by further comprising the following steps:
and step 3: second concentration
Adding a coagulant into the organic concentrated waste liquid, and uniformly stirring to ensure that organic matters in the organic concentrated waste liquid and the coagulant fully react to obtain a concentrated solution;
carrying out secondary concentration treatment on the concentrated solution, carrying out high concentration to obtain a high-concentration concentrated solution and clear solution, and refluxing the clear solution for carrying out LROT treatment again;
and 4, step 4: spray drying
Carrying out spray drying treatment on the high-concentration concentrated solution, and fully contacting with high-temperature hot air to obtain dried organic matters and generate tail gas;
and 5: sludge drying
Carrying out sludge drying treatment on residual sludge generated after biological treatment by using tail gas discharged after spray drying treatment to obtain dried sludge;
step 6: incineration of
The burning treatment is carried out on the dried organic matters and the dried sludge, and CO is finally formed after the burning treatment because the main component of the sludge is humic acid organic matters2+H2O。
2. The method for treating high-difficulty wastewater with zero concentrate and zero solid waste according to claim 1, wherein the high-difficulty wastewater is one of landfill leachate, coal chemical wastewater and pharmaceutical wastewater.
3. The method for treating highly difficult waste water with zero concentrated solution and zero solid waste according to claim 1, wherein in the step 3, the coagulant is one or more of Fe oxide, Co oxide, Ni oxide, Cu oxide and Zn oxide, or one or more of Fe salt, Co salt, Ni salt, Cu salt and Zn salt, or a mixture of one or more of Fe oxide, Co oxide, Ni oxide, Cu oxide and Zn oxide and C; wherein, the adding amount of the coagulant is determined according to the COD content of the concentrated solution and the type of the coagulant.
4. The method as claimed in claim 1, wherein the drying temperature in the spray drying process in step 4 is 150-220 ℃; the water content of the dried organic matters is 5% +/-1%.
5. The method for treating waste water with high difficulty and without concentrated solution and solid waste of claim 1, wherein in the step 6, the hot air generated by the burning unit passes through a furnace exhaust chamber, is conveyed by a fan to be discharged outside, is sent to the spray drying unit and serves as heat energy to be consumed during drying.
6. The high-difficulty wastewater treatment device is characterized by comprising a biochemical treatment unit, an LROT treatment unit, a sludge drying unit, a secondary concentration unit, a spray drying unit and an incineration unit;
the biochemical treatment unit is provided with a water inlet of high-difficulty wastewater, a water outlet of the biochemical treatment unit is connected with a water inlet of the LROT treatment unit, the LROT treatment unit is provided with a standard water discharge port and an organic concentrated waste liquid discharge port, the organic concentrated waste liquid discharge port of the LROT treatment unit is connected with the secondary concentration unit, a high-concentration concentrated liquid outlet of the secondary concentration unit is connected with the spray drying unit, and a dried organic matter outlet of the spray drying unit is connected with the incineration unit.
7. The zero concentrate and zero solid waste high difficulty wastewater treatment plant of claim 6, wherein the secondary concentration unit is provided with a clear liquid outlet, and the clear liquid outlet of the secondary concentration unit is connected to the water inlet of the LROT treatment unit through a pipeline.
8. The zero-concentrated-liquid and zero-solid-waste high-difficulty wastewater treatment device according to claim 6, wherein a residual sludge outlet of the biochemical treatment unit is connected with the sludge drying unit, and a dried sludge outlet of the sludge drying unit is connected with the incineration unit.
9. The zero-concentrated-liquid and zero-solid-waste high-difficulty wastewater treatment device according to claim 6, wherein a hot air outlet of the incineration unit is connected with the spray drying unit, and a tail gas outlet of the spray drying unit is connected with the sludge drying unit.
CN202010206031.8A 2020-03-23 2020-03-23 High-difficulty wastewater treatment method and device with zero concentrated solution and zero solid waste Pending CN111348803A (en)

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