CN110746050A - Self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy and treatment process - Google Patents

Self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy and treatment process Download PDF

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Publication number
CN110746050A
CN110746050A CN201911119670.4A CN201911119670A CN110746050A CN 110746050 A CN110746050 A CN 110746050A CN 201911119670 A CN201911119670 A CN 201911119670A CN 110746050 A CN110746050 A CN 110746050A
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tank
printing
dyeing
stage
reverse osmosis
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陈永勤
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Suzhou Hongsheng Environmental Protection Technology Co Ltd
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Suzhou Hongsheng Environmental Protection Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—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
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to a self-sufficient cyclic regeneration system and a treatment process for dyeing and desizing wastewater water, which comprises a regulating tank, a UASB reactor, a biological selection tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR tank, an RO reverse osmosis system, a triple-effect evaporator, a comprehensive methane utilization system and a sludge treatment system, wherein the regulating tank, the UASB reactor, the biological selection tank, the hydrolysis acidification tank, the contact oxidation tank, the MBR tank, the RO reverse osmosis system and the triple-effect evaporator are; the system is mainly used for treating the wastewater containing high-concentration COD, so that sufficient biogas can be generated through the reaction treatment of the UASB reactor, sufficient steam is generated through the biogas boiler to realize self-sufficiency of energy, and the treatment cost of the wastewater containing high-concentration COD can be effectively reduced; meanwhile, in order to generate enough methane in the stage of the UASB reactor and ensure enough COD concentration, pretreatment can not be carried out in the early stage.

Description

Self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy and treatment process
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a self-sufficient cyclic regeneration system and a treatment process for dyeing and printing desizing wastewater.
Background
The printing and dyeing industry is an important component of the textile industry and is also a main wastewater source of the textile industry, and the printing and dyeing process comprises desizing, scouring, bleaching, mercerizing, dyeing, printing, finishing and the like, wherein the COD load generated by the printing and dyeing desizing wastewater accounts for about 50% of the total COD of the printing and dyeing wastewater, and organic pollutants such as various size decomposers, acid, fiber scraps and the like account for about half of the total amount; the printing and dyeing desizing wastewater is alkaline, the pH value is 9-13, the average value of the COD concentration of the common printing and dyeing desizing wastewater can reach about 15000mg/L, the COD concentration of a plurality of printing and dyeing desizing wastewater is higher, the waste water is accumulated in a large amount in the environment, so that the foam on the surface of the polluted water body is increased, the viscosity is increased, the activity of aerobic microorganisms is influenced, and the serious environmental protection problem is brought, therefore, the wastewater needs to be strictly treated, the treated wastewater can reach the discharge standard and be directly discharged, and can be further treated for recycling, but because of the relative difficulty in handling, the energy consumption level of the whole system is high, the investment cost is excessive, therefore, the invention develops a self-sufficient type circular regeneration system and a treatment process for the dyeing desizing waste water, the method solves the problems in the prior art, and a technical scheme which is the same as or similar to the method is not found through retrieval.
Disclosure of Invention
The invention aims to: the self-sufficient type circular regeneration system and the treatment process for the dyeing and printing desizing wastewater are provided, so that the problem of overhigh energy consumption in the treatment of high-concentration dyeing and printing desizing wastewater in the prior art is solved, and the restriction of high energy consumption on further recycling of the wastewater is eliminated or reduced.
The technical scheme of the invention is as follows: a self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy comprises a regulating tank, a UASB reactor, a biological selection tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR tank, an RO reverse osmosis system and a triple-effect evaporator which are sequentially connected through pipelines, and further comprises a methane comprehensive utilization system and a sludge treatment system; a return pipeline is arranged between the UASB reactor and the biological selection tank, and a return pump is arranged on the return pipeline; a ventilation pipeline is arranged between the biogas comprehensive utilization system and the UASB reactor, and a steam pipeline is arranged between the adjustment tank and the triple-effect evaporator; the sludge treatment system comprises a sludge tank and a filter press, wherein the sludge tank is communicated with the biological selection tank through a pipeline.
Preferably, the comprehensive methane utilization system comprises a methane tank and a methane boiler connected with the methane tank; the biogas boiler is respectively connected with the regulating tank and the triple-effect evaporator through a steam pipeline.
Preferably, a sludge bed and a three-phase separator are arranged in the UASB reactor, the upper end of the three-phase separator is connected with a vent pipeline, the vent pipeline is communicated with a methane tank, and a primary water-sealed tank and a secondary water-sealed tank are arranged on the vent pipeline; a central guide flow cylinder is arranged in the middle of the biological selection tank, an overflow weir is arranged at the upper end of the side wall, and the lower end of the central guide flow cylinder is trumpet-shaped; the hydrolysis acidification tank and the contact oxidation tank are both internally provided with combined fillers; and an MBR membrane module is arranged in the MBR tank.
Preferably, the RO reverse osmosis system comprises a first-stage RO reverse osmosis membrane module, a first-stage RO concentrated water tank, a second-stage RO reverse osmosis membrane module and a second-stage RO concentrated water tank which are communicated through pipelines.
Preferably, an intermediate tank, a first safety filter and a first high-pressure pump are arranged between the MBR tank and the first-stage RO reverse osmosis membrane module; and a second security filter and a second high-pressure pump are arranged between the first-stage RO concentrated water tank and the second-stage RO reverse osmosis membrane module.
Based on the self-sufficient cyclic regeneration system for the dyeing and printing desizing waste water energy, the invention also develops a treatment process for the self-sufficient cyclic regeneration system for the dyeing and printing desizing waste water energy, and the process comprises the following steps:
(1) collecting each path of printing and dyeing desizing wastewater, feeding the collected printing and dyeing desizing wastewater into an adjusting tank, uniformly mixing, adjusting the pH value of the printing and dyeing desizing wastewater to be 7-8.5, adjusting the alkalinity to be 300-450 mmol/L, controlling the COD concentration of the printing and dyeing desizing wastewater to be 13500-16000 mg/L, and uniformly introducing the printing and dyeing desizing wastewater into the lower part inside the UASB reactor;
(2) printing and dyeing desizing wastewater entering from the lower part of a UASB reactor upwards passes through a sludge bed, organic matters in the printing and dyeing desizing wastewater are converted into biogas through anaerobic reaction, then the organic matters continuously move upwards and are subjected to three-phase separation through a three-phase separator, solid sludge is remained in the UASB reactor, liquid printing and dyeing desizing wastewater subjected to primary treatment enters a biological selection pool, the generated biogas enters a biogas tank along a vent pipeline, and the volume load of COD (chemical oxygen demand) of the UASB reactor is 4-6 kg (COD)/(m)3D), the hydraulic retention time is 60-90 h, and the gas production intensity of the biogas is more than or equal to 1m3/m2H; the marsh gas entering the marsh gas tank enters the marsh gas boilerCombusting, wherein the generated steam is respectively introduced into the regulating tank and the triple-effect evaporator to provide a heating source for the triple-effect evaporator, and simultaneously, the steam is introduced into the regulating tank to raise the temperature of liquid in the regulating tank, wherein the temperature is controlled to be 35-40 ℃;
(3) printing and dyeing desizing wastewater entering the biological selection tank flows in from the central guide cylinder, is uniformly distributed from the lower end of the biological selection tank to the periphery, slowly rises along the whole end surface of the biological selection tank, activated sludge sinks to the bottom of the biological selection tank under the action of gravity, and flows back to the UASB reactor through a reflux pump, the residual activated sludge flows to the sludge tank, is subjected to solid-liquid separation through a filter press, and supernatant of the further-treated printing and dyeing desizing wastewater is discharged from an overflow weir and enters a hydrolysis acidification tank;
(4) hydrolytic acidification bacteria are cultured on the combined filler in the hydrolytic acidification tank, printing and dyeing desizing wastewater entering the hydrolytic acidification tank reacts with the hydrolytic acidification bacteria, insoluble organic matters are hydrolyzed into soluble substances under the anoxic condition in the hydrolytic acidification tank, macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, and then the substances flow to the contact oxidation tank;
(5) aerobic bacteria are cultured on the combined filler in the contact oxidation tank, the printing and dyeing desizing wastewater entering the contact oxidation tank reacts with the aerobic bacteria, organic matters in the printing and dyeing desizing wastewater are catalytically dissolved and oxidized, and are decomposed into water and carbon dioxide, and the further evolved printing and dyeing desizing wastewater enters the MBR tank again;
(6) the printing and dyeing desizing wastewater entering the MBR tank is subjected to interception of internal activated sludge and macromolecular organic matters through an MBR membrane component, then flows into an intermediate tank for uniform and stable subsequent treatment, is filtered through a first security filter, and then enters a first-stage RO reverse osmosis membrane component through a first high-pressure pump;
(7) the printing and dyeing desizing wastewater entering the first-stage RO reverse osmosis membrane component is subjected to reverse osmosis treatment to form fresh water and concentrated water, wherein the fresh water is discharged outside, the concentrated water enters the first-stage RO concentrated water tank, then the concentrated water enters the second-stage RO reverse osmosis membrane component through the second cartridge filter and the second high-pressure pump again for reverse osmosis treatment, the fresh water is discharged continuously, the concentrated water enters the second-stage RO concentrated water tank, and the fresh water recovery rate is 83-88%;
(8) concentrated water in the second-stage RO concentrated water tank enters a three-effect evaporator, a heating source is provided by steam generated by a methane boiler, and the thickness of the steam is 1m3The consumption of the steam required by the concentrated water is 385-420 kg, so that the waste water is continuously evaporated, finally the impurities and the soluble solids are crystallized, and the discharged condensed water is recycled, namely the complete purification treatment of the printing and dyeing desizing waste water is realized.
Preferably, the COD concentration of the printing and dyeing desizing wastewater entering the regulating tank in the step (1) is 15000 mg/L.
Preferably, the UASB reactor in the step (2) has a COD volume load of 5kg (COD)/(m)3D) the hydraulic retention time is 72 h.
Compared with the prior art, the invention has the advantages that:
the system is mainly used for treating the wastewater containing high-concentration COD, so that sufficient biogas can be generated through the reaction treatment of the UASB reactor, sufficient steam is generated through the biogas boiler to realize self-sufficiency of energy, and the treatment cost of the wastewater containing high-concentration COD can be effectively reduced; meanwhile, in order to generate enough methane in the stage of the UASB reactor and ensure enough COD concentration, pretreatment can not be carried out in the early stage.
The UASB reactor is the core of the system in the whole process of the invention, and the removal rate of the UASB reactor and the amount of the generated biogas are directly related to whether the whole system can realize energy self-sufficiency while meeting the requirement of wastewater recycling.
Drawings
The invention is further described with reference to the following figures and examples:
fig. 1 is a schematic diagram of the structure of the present invention.
Wherein: 1. a regulating tank;
2. a UASB reactor 21, a sludge bed 22, a three-phase separator 23, a vent pipeline 24, a first-stage water-sealed tank 25, a second-stage water-sealed tank 26, a return pipeline 27 and a return pump;
3. a biological selection pool 31, a central guide cylinder 32 and an overflow weir;
4. a hydrolysis acidification tank, 5, a contact oxidation tank, 451 and combined filler;
6. (ii) a MBR tank, 61, MBR membrane module, 62 and submersible stirrer;
7. an RO reverse osmosis system 71, a first-stage RO reverse osmosis membrane module 72, a first-stage RO concentrated water tank 73, a second-stage RO reverse osmosis membrane module 74 and a second-stage RO concentrated water tank;
8. a triple effect evaporator;
9. a biogas comprehensive utilization system 91, a biogas tank 92, a biogas boiler 93, a steam pipeline 94, a first valve 95 and a second valve;
10. a sludge treatment system 101, a sludge tank 102 and a filter press;
111. an intermediate pool, 112, a first security filter, 113, a first high pressure pump, 114, a second security filter, 115, a second high pressure pump.
Detailed Description
The present invention will be further described in detail with reference to the following specific examples:
as shown in figure 1, the self-sufficient type circular regeneration system for the dyeing and printing desizing wastewater energy is used for realizing self-sufficient energy in the treatment of wastewater containing high-concentration COD, and comprises an adjusting tank 1, a UASB reactor 2, a biological selection tank 3, a hydrolysis acidification tank 4, a contact oxidation tank 5, an MBR tank 6, an RO reverse osmosis system 7 and a triple-effect evaporator 8 which are sequentially connected through pipelines, and further comprises a methane comprehensive utilization system 9 and a sludge treatment system 10.
The adjusting tank 1 is internally provided with a temperature sensor and a liquid level meter, the temperature sensor is used for detecting and realizing the control of the temperature in the adjusting tank 1, and the liquid level meter is used for detecting the water level in the adjusting tank 1.
A sludge bed 21 and a three-phase separator 22 are arranged in the UASB reactor 2, the sludge bed 21 is arranged at the middle section of the UASB reactor 2, the three-phase separator 22 is arranged at the upper end in the UASB reactor 2, and the upper end of the three-phase separator 22 is connected with a vent pipeline 23; a return pipeline 26 is arranged between the lower end of the UASB reactor 2 and the biological selection tank 3, and a return pump 27 is arranged on the return pipeline 26.
The middle part of the biological selection tank 3 is provided with a central guide cylinder 31, the upper end of the side wall is provided with an overflow weir 32, the central guide cylinder 31 extends downwards from the upper end of the biological selection tank 3, and the lower end is trumpet-shaped.
The hydrolysis acidification tank 4 and the contact oxidation tank 5 are both provided with combined fillers 451, hydrolysis acidification bacteria are cultured on the combined fillers 451 in the hydrolysis acidification tank 4, and aerobic bacteria are cultured on the combined fillers 451 in the contact oxidation tank 5; an MBR membrane module 61 is arranged in the MBR tank 6, and a submersible stirrer 62 is arranged in the MBR tank.
The RO reverse osmosis system 7 comprises a first-stage RO reverse osmosis membrane module 71, a first-stage RO concentrated water tank 72, a second-stage RO reverse osmosis membrane module 73 and a second-stage RO concentrated water tank 74 which are communicated with each other through pipelines, wherein an intermediate tank 111, a first security filter 112 and a first high-pressure pump 113 are arranged between the first-stage RO reverse osmosis membrane module 71 and the MBR tank 6, and a second security filter 114 and a second high-pressure pump 115 are arranged between the first-stage RO concentrated water tank 72 and the second-stage RO reverse osmosis membrane module 73; the intermediate tank 111 mainly plays a role in regulation, ensures the uniformity and stability of subsequent treatment, reduces the impact on the RO reverse osmosis system 7 and ensures normal operation; the first safety filter 112 and the second safety filter 114 are provided to remove fine particles with turbidity of 1FTU or more, so as to meet the requirement of the subsequent process on the inflow water.
The methane comprehensive utilization system 9 comprises a methane tank 91 and a methane boiler 92 connected with the methane tank, the methane tank 91 is connected with the UASB reactor 2 through a vent line 23, and the ventilation pipeline 23 is provided with a primary water-sealed tank 24 and a secondary water-sealed tank 25, the biogas boiler 92 is respectively connected with the regulating tank 1 and the triple-effect evaporator 8 through a steam pipeline 93, the biogas boiler 92 is used for burning biogas to generate steam, the steam pipeline 93 is respectively provided with a first valve 94 and a second valve 95, wherein, the first valve 94 is arranged on the steam pipeline 93 of the biogas boiler 92 connected with the regulating reservoir 1, the second valve 95 is arranged on the steam pipeline 93 of the biogas boiler 92 connected with the triple-effect evaporator 8, the first valve 94 is electrically connected with the temperature sensor, and the on-off of the first valve 94 is realized through the liquid temperature in the regulating reservoir 1 monitored by the temperature sensor, so that the water temperature in the regulating reservoir 1 is relatively and stably controlled within a specific set range; the comprehensive methane utilization system is mainly used for realizing methane combustion to generate steam and realizing self-sufficiency of energy of the whole system.
As the recycling of the biogas can be used for generating electricity and generating steam, and for the system, the utilization efficiency of the biogas electricity generation is 38-42 percent, and the utilization efficiency of the steam generated by biogas combustion is 80-90 percent, the invention burns the recycled biogas through a biogas boiler 92 to generate steam, and does not adopt the biogas to generate electricity; if the wastewater only needs to be partially recycled and partially discharged after reaching the standard, the triple-effect evaporator 8 is not needed, and a large amount of steam is not needed to be consumed at the moment.
The sludge treatment system comprises a sludge tank 101 and a filter press 102, wherein the sludge tank 101 is communicated with the biological selection tank 3 through a pipeline, activated sludge is precipitated in the biological selection tank 3, part of the activated sludge flows back to the UASB reactor 2, and the rest of the activated sludge is discharged into the sludge tank 101 and is subjected to solid-liquid separation through the filter press 102.
In the invention, water pumps are arranged on pipelines connecting the regulating tank 1, the UASB reactor 2, the biological selection tank 3, the hydrolysis acidification tank 4, the contact oxidation tank 5, the MBR tank 6, the intermediate tank 111 and the triple-effect evaporator 8, and sludge pumps are arranged on pipelines connecting the sludge tank 101 and the biological selection tank 3 for realizing the normal operation of the system.
Based on the self-sufficient cyclic regeneration system for the dyeing and printing desizing waste water energy, the invention also discloses a treatment process for the self-sufficient cyclic regeneration system for the dyeing and printing desizing waste water energy, which comprises the following steps:
(1) collecting each path of printing and dyeing desizing wastewater, feeding the collected printing and dyeing desizing wastewater into an adjusting tank, uniformly mixing, adjusting the pH value of the printing and dyeing desizing wastewater to be 7-8.5, adjusting the alkalinity to be 300-450 mmol/L, controlling the COD concentration of the printing and dyeing desizing wastewater to be 13500-16000 mg/L, and uniformly introducing the printing and dyeing desizing wastewater into the lower part inside the UASB reactor;
(2) printing and dyeing desizing wastewater entering from the lower part of the UASB reactor upwards passes through a sludge bed, so that organic matters in the printing and dyeing desizing wastewater are converted into methane through anaerobic reaction, and then continuously upwards move to carry out three-phase separation through a three-phase separatorAnd (2) leaving solid sludge in the UASB reactor, allowing the primarily treated liquid printing, dyeing and desizing wastewater to enter a biological selection tank, allowing the generated biogas to enter a biogas tank along an air pipeline, wherein the volume load of COD of the UASB reactor is 4-6 kg (COD)/(m)3D), the hydraulic retention time is 60-90 h, and the gas production intensity of the biogas is more than or equal to 1m3/m2H; the biogas entering the biogas tank enters a biogas boiler for combustion, the generated steam is respectively introduced into the regulating tank and the triple-effect evaporator to provide a heating source for the triple-effect evaporator, and the steam is introduced into the regulating tank to raise the temperature of the liquid in the regulating tank and control the temperature to be 35-40 ℃;
(3) printing and dyeing desizing wastewater entering the biological selection tank flows in from the central guide cylinder, is uniformly distributed from the lower end of the biological selection tank to the periphery, slowly rises along the whole end surface of the biological selection tank, activated sludge sinks to the bottom of the biological selection tank under the action of gravity, and flows back to the UASB reactor through a reflux pump, the residual activated sludge flows to the sludge tank, is subjected to solid-liquid separation through a filter press, and supernatant of the further-treated printing and dyeing desizing wastewater is discharged from an overflow weir and enters a hydrolysis acidification tank;
(4) hydrolytic acidification bacteria are cultured on the combined filler in the hydrolytic acidification tank, printing and dyeing desizing wastewater entering the hydrolytic acidification tank reacts with the hydrolytic acidification bacteria, insoluble organic matters are hydrolyzed into soluble substances under the anoxic condition in the hydrolytic acidification tank, macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, and then the substances flow to the contact oxidation tank;
(5) aerobic bacteria are cultured on the combined filler in the contact oxidation tank, the printing and dyeing desizing wastewater entering the contact oxidation tank reacts with the aerobic bacteria, organic matters in the printing and dyeing desizing wastewater are catalytically dissolved and oxidized, and are decomposed into water and carbon dioxide, and the further evolved printing and dyeing desizing wastewater enters the MBR tank again;
(6) the printing and dyeing desizing wastewater entering the MBR tank is subjected to interception of internal activated sludge and macromolecular organic matters through an MBR membrane component, then flows into an intermediate tank for uniform and stable subsequent treatment, is filtered through a first security filter, and then enters a first-stage RO reverse osmosis membrane component through a first high-pressure pump;
(7) the printing and dyeing desizing wastewater entering the first-stage RO reverse osmosis membrane component is subjected to reverse osmosis treatment to form fresh water and concentrated water, wherein the fresh water is discharged outside, the concentrated water enters the first-stage RO concentrated water tank, then the concentrated water enters the second-stage RO reverse osmosis membrane component through the second cartridge filter and the second high-pressure pump again for reverse osmosis treatment, the fresh water is discharged continuously, the concentrated water enters the second-stage RO concentrated water tank, and the fresh water recovery rate is 83-88%;
(8) concentrated water in the second-stage RO concentrated water tank enters a three-effect evaporator, a heating source is provided by steam generated by a methane boiler, and the thickness of the steam is 1m3The consumption of the steam required by the concentrated water is 385-420 kg, so that the waste water is continuously evaporated, finally the impurities and the soluble solids are crystallized, and the discharged condensed water is recycled, namely the complete purification treatment of the printing and dyeing desizing waste water is realized.
In order to realize the self-sufficiency of energy of the whole system, the biogas production strength is required to be more than or equal to 1m3/m2H, and the main factors influencing the strength of biogas production are the initial printing and dyeing desizing wastewater COD concentration, the UASB reactor COD volume load and the hydraulic retention time in the UASB reactor, and the following examples are used to further explain step (1) and step (2) of the treatment process of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
(1) Collecting each path of printing and dyeing desizing wastewater, feeding the collected printing and dyeing desizing wastewater into an adjusting tank, uniformly mixing, adjusting the pH value of the printing and dyeing desizing wastewater to be 7-8.5, adjusting the alkalinity to be 300-450 mmol/L, controlling the COD concentration of the printing and dyeing desizing wastewater to be 15000mg/L, and uniformly introducing the printing and dyeing desizing wastewater into the lower part inside the UASB reactor;
(2) printing and dyeing desizing wastewater entering from the lower part of the UASB reactor upwards passes through a sludge bed, so that organic matters in the printing and dyeing desizing wastewater are converted into methane through anaerobic reaction, then the organic matters continuously move upwards to carry out three-phase separation through a three-phase separator, solid sludge is remained in the UASB reactor, liquid printing and dyeing desizing wastewater subjected to primary treatment enters a biological selection pool, generated methane enters a methane tank along a vent pipeline, and the UASB reactor is used for reactingThe COD volume load of the vessel was 4kg (COD)/(m)3D), the hydraulic retention time is 90h, and the gas production intensity of the biogas is 0.81m3/m2H; the biogas entering the biogas tank enters a biogas boiler for combustion, the generated steam is respectively introduced into the regulating tank and the triple-effect evaporator to provide a heating source for the triple-effect evaporator, and the steam is introduced into the regulating tank to raise the temperature of the liquid in the regulating tank, wherein the temperature is controlled to be 35-40 ℃.
Example 2
The present embodiment is different from embodiment 1 in that: the COD concentration of the printing and dyeing desizing wastewater in the step (1) is 15000mg/L, and the COD volume load of the UASB reactor in the step (2) is 5kg (COD)/(m)3D) the hydraulic retention time is 72h, and the gas strength of the finally produced biogas is 1.01m3/m2·h。
Example 3
The present embodiment is different from embodiment 1 in that: the COD concentration of the printing and dyeing desizing wastewater in the step (1) is 15000mg/L, and the COD volume load of the UASB reactor in the step (2) is 6kg (COD)/(m)3D) the hydraulic retention time is 60h, and the gas strength of the finally produced biogas is 1.19m3/m2·h。
The following table is a table of comparative values given for example 1, example 2 and example 3 with respect to the COD concentration of the dye printing desizing wastewater, the COD volume load of the UASB reactor and the strength of the gas evolution influenced by the hydraulic retention time:
COD concentration (mg/L) 15000 15000 15000
COD volume load (kg (COD)/(m)3·d)) 4 5 6
Hydraulic retention time (h) 90 72 60
Strength of gas evolution (m)3/m2·h) 0.81 1.01 1.19
The sufficient gas production intensity is satisfied, and the complete mixing condition in the reactor is satisfied (the gas production intensity is more than or equal to 1 m)3/m2H) the longer the hydraulic retention time, the lower the COD volume load, the better, so example 2 can be selected as the most preferred example for the three examples described above.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, without any reference thereto being construed as limiting the claim concerned.

Claims (8)

1. The self-sufficient type cyclic regeneration system for the dyeing and printing desizing waste water energy is characterized in that: the system comprises an adjusting tank, a UASB reactor, a biological selection tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR tank, an RO reverse osmosis system and a triple-effect evaporator which are sequentially connected through pipelines, and also comprises a methane comprehensive utilization system and a sludge treatment system; a return pipeline is arranged between the UASB reactor and the biological selection tank, and a return pump is arranged on the return pipeline; a ventilation pipeline is arranged between the biogas comprehensive utilization system and the UASB reactor, and a steam pipeline is arranged between the adjustment tank and the triple-effect evaporator; the sludge treatment system comprises a sludge tank and a filter press, wherein the sludge tank is communicated with the biological selection tank through a pipeline.
2. The printing and dyeing desizing waste water self-sufficient type recycling system of claim 1, characterized in that: the methane comprehensive utilization system comprises a methane tank and a methane boiler connected with the methane tank; the biogas boiler is respectively connected with the regulating tank and the triple-effect evaporator through a steam pipeline.
3. The printing and dyeing desizing waste water self-sufficient type recycling system of claim 2, characterized in that: a sludge bed and a three-phase separator are arranged in the UASB reactor, the upper end of the three-phase separator is connected with a vent pipeline, the vent pipeline is communicated with a methane tank, and a primary water-sealed tank and a secondary water-sealed tank are arranged on the vent pipeline; a central guide flow cylinder is arranged in the middle of the biological selection tank, an overflow weir is arranged at the upper end of the side wall, and the lower end of the central guide flow cylinder is trumpet-shaped; the hydrolysis acidification tank and the contact oxidation tank are both internally provided with combined fillers; and an MBR membrane module is arranged in the MBR tank.
4. The printing and dyeing desizing waste water self-sufficient type recycling system of claim 1, characterized in that: the RO reverse osmosis system comprises a first-stage RO reverse osmosis membrane assembly, a first-stage RO concentrated water tank, a second-stage RO reverse osmosis membrane assembly and a second-stage RO concentrated water tank which are communicated through pipelines.
5. The printing and dyeing desizing waste water self-sufficient type recycling system of claim 4, wherein: an intermediate tank, a first safety filter and a first high-pressure pump are arranged between the MBR tank and the first-stage RO reverse osmosis membrane module; and a second security filter and a second high-pressure pump are arranged between the first-stage RO concentrated water tank and the second-stage RO reverse osmosis membrane module.
6. The treatment process of the self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy based on the claims 1-5 is characterized in that: the process comprises the following specific steps:
(1) collecting each path of printing and dyeing desizing wastewater, feeding the collected printing and dyeing desizing wastewater into an adjusting tank, uniformly mixing, adjusting the pH value of the printing and dyeing desizing wastewater to be 7-8.5, adjusting the alkalinity to be 300-450 mmols/L, simultaneously controlling the COD concentration of the printing and dyeing desizing wastewater to be 13500-16000 mg/L, and uniformly introducing the printing and dyeing desizing wastewater into the lower part inside the UASB reactor;
(2) printing and dyeing desizing wastewater entering from the lower part of a UASB reactor upwards passes through a sludge bed, organic matters in the printing and dyeing desizing wastewater are converted into biogas through anaerobic reaction, then the organic matters continuously move upwards and are subjected to three-phase separation through a three-phase separator, solid sludge is remained in the UASB reactor, liquid printing and dyeing desizing wastewater subjected to primary treatment enters a biological selection pool, the generated biogas enters a biogas tank along a vent pipeline, and the volume load of COD (chemical oxygen demand) of the UASB reactor is 4-6 kg (COD)/(m)3D), the hydraulic retention time is 60-90 h, and the gas production intensity of the biogas is more than or equal to 1m3/m2H; the biogas entering the biogas tank enters a biogas boiler for combustion, the generated steam is respectively introduced into the regulating tank and the triple-effect evaporator to provide a heating source for the triple-effect evaporator, and the steam is introduced into the regulating tank to raise the temperature of the liquid in the regulating tank and control the temperature to be 35-40 ℃;
(3) printing and dyeing desizing wastewater entering the biological selection tank flows in from the central guide cylinder, is uniformly distributed from the lower end of the biological selection tank to the periphery, slowly rises along the whole end surface of the biological selection tank, activated sludge sinks to the bottom of the biological selection tank under the action of gravity, and flows back to the UASB reactor through a reflux pump, the residual activated sludge flows to the sludge tank, is subjected to solid-liquid separation through a filter press, and supernatant of the further-treated printing and dyeing desizing wastewater is discharged from an overflow weir and enters a hydrolysis acidification tank;
(4) hydrolytic acidification bacteria are cultured on the combined filler in the hydrolytic acidification tank, printing and dyeing desizing wastewater entering the hydrolytic acidification tank reacts with the hydrolytic acidification bacteria, insoluble organic matters are hydrolyzed into soluble substances under the anoxic condition in the hydrolytic acidification tank, macromolecular and difficultly biodegradable substances are converted into easily biodegradable substances, and then the substances flow to the contact oxidation tank;
(5) aerobic bacteria are cultured on the combined filler in the contact oxidation tank, the printing and dyeing desizing wastewater entering the contact oxidation tank reacts with the aerobic bacteria, organic matters in the printing and dyeing desizing wastewater are catalytically dissolved and oxidized, and are decomposed into water and carbon dioxide, and the further evolved printing and dyeing desizing wastewater enters the MBR tank again;
(6) the printing and dyeing desizing wastewater entering the MBR tank is subjected to interception of internal activated sludge and macromolecular organic matters through an MBR membrane component, then flows into an intermediate tank for uniform and stable subsequent treatment, is filtered through a first security filter, and then enters a first-stage RO reverse osmosis membrane component through a first high-pressure pump;
(7) the printing and dyeing desizing wastewater entering the first-stage RO reverse osmosis membrane component is subjected to reverse osmosis treatment to form fresh water and concentrated water, wherein the fresh water is discharged outside, the concentrated water enters the first-stage RO concentrated water tank, then the concentrated water enters the second-stage RO reverse osmosis membrane component through the second cartridge filter and the second high-pressure pump again for reverse osmosis treatment, the fresh water is discharged continuously, the concentrated water enters the second-stage RO concentrated water tank, and the fresh water recovery rate is 83-88%;
(8) concentrated water in the second-stage RO concentrated water tank enters a three-effect evaporator, a heating source is provided by steam generated by a methane boiler, and the thickness of the steam is 1m3The consumption of the steam required by the concentrated water is 385-420 kg, so that the waste water is continuously evaporated, finally the impurities and the soluble solids are crystallized, and the discharged condensed water is recycled, namely the complete purification treatment of the printing and dyeing desizing waste water is realized.
7. The treatment process of the self-contained printing and dyeing desizing waste water energy recycling system according to claim 6, characterized in that: and (2) the COD concentration of the printing and dyeing desizing wastewater entering the regulating tank in the step (1) is 15000 mg/L.
8. The treatment process of the self-contained printing and dyeing desizing waste water energy recycling system according to claim 6, characterized in that: the UASB reactor in the step (2) has a COD volume load of 5kg (COD)/(m)3D) the hydraulic retention time is 72 h.
CN201911119670.4A 2019-11-15 2019-11-15 Self-sufficient cyclic regeneration system for dyeing and printing desizing waste water energy and treatment process Withdrawn CN110746050A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111533393A (en) * 2020-05-22 2020-08-14 北京工业大学 System and method for purifying aquaculture wastewater and recovering energy and nutrient elements in aquaculture wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111533393A (en) * 2020-05-22 2020-08-14 北京工业大学 System and method for purifying aquaculture wastewater and recovering energy and nutrient elements in aquaculture wastewater

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