CN102674640B - Washing bleaching and dyeing wastewater treatment method - Google Patents

Washing bleaching and dyeing wastewater treatment method Download PDF

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Publication number
CN102674640B
CN102674640B CN 201210185137 CN201210185137A CN102674640B CN 102674640 B CN102674640 B CN 102674640B CN 201210185137 CN201210185137 CN 201210185137 CN 201210185137 A CN201210185137 A CN 201210185137A CN 102674640 B CN102674640 B CN 102674640B
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dyeing
water
washing bleaching
pond
bioselection
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CN102674640A (en
Inventor
黄福川
卢誉远
林应强
谭建活
唐春媚
陈宁
杨夏
熊庆明
黎羽中
谢容珍
卢云敏
卢朝霞
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Guangxi Jingce Technical Consulting Service Co Ltd
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Guangxi University
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Abstract

The invention relates to a washing bleaching and dyeing wastewater treatment method. The washing bleaching and dyeing wastewater treatment method comprises the following processing steps of: (1) wastewater pretreatment; (2) physico-chemical precipitation treatment; (3) biological selection treatment; (4) aeration treatment in an improved oxidation ditch; and (5) natural sedimentation treatment. Aiming at the characteristic of large water consumption in washing bleaching and dyeing industries, a physical chemistry technology and a biological technology are used for treating washing bleaching and dyeing wastewater according to the washing bleaching and dyeing wastewater treatment method, and therefore, the washing bleaching and dyeing wastewater treatment method realizes the production recycling of most water while leading the treated wastewater to reach the Discharge Standard of Water Pollutant for Dyeing and Finishing of Textile Industry GB 4287-92. By adopting the washing bleaching and dyeing wastewater treatment method, the discharged wastewater is reduced, resources are saved and environments are protected; and simultaneously, the washing bleaching and dyeing wastewater treatment method has the characteristics of low investment cost, low energy consumption, high treatment efficiency, great capacity of resisting load impact, low sludge yield and high recycling ratio of reclaimed water.

Description

Washing Bleaching and dyeing sewage treatment process
Technical field
The present invention relates to a kind of washing Bleaching and dyeing sewage treatment process.
Background technology
The dye species of at present whole world use reaches tens thousand of kinds, mainly contain dyestuff, slurry, auxiliary agent, finish, soda acid, fiber impurity and inorganic salt etc. in the bleaching and dyeing wastewater, have that complicated component, changeableization, concentration are high, colourity is high, strong toxicity, difficult degradation, characteristics that the water quality mobility scale is large, be one of main organic waste water source of pollution of China; According to the statistics made by the departments concerned, the annual bleaching and dyeing wastewater that produces of China is about 1,600,000,000 tons at present, ranked sixth the position in whole industrial wastewater discharge.In addition, because in recent years development, the rise of Silk and the progress of finishing process in printing and dye-ing technology of chemical industry fabric, the organism of the bio-refractories such as PVA slurry, artificial silk alkaline hydrolysis thing (mainly being O-phthalic acids material), New-type adjuvant enters in the waste water in a large number, the intractability of bleaching and dyeing wastewater is also increasing, use present technique can't process such waste water fully, traditional treatment method is subject to serious challenge.In addition, the traditional technology method is processed and is also had the weak points such as the chemical agent usage quantity is large, processing cost is high, occupation of land is many, complex process, scale of investment is large, wastewater recycle rate is low.Therefore, find a kind of washing Bleaching and dyeing sewage treatment process novel, technology maturation to replace conventional processes just to seem very urgent.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of discharge of wastewater, most of water reuse, protection of the environment, energy consumption is low, processing efficiency is high and cost of investment is low washing Bleaching and dyeing sewage treatment process of reducing.
The present invention solves the problems of the technologies described above with following technical scheme:
The flow process of washing Bleaching and dyeing sewage treatment process comprises following processing step:
(1) sewage pre-treatment: the sewage pre-treatment comprises pretreatment pool and equalizing tank; Washing Bleaching and dyeing sewage by escape canal at first enters the settling pit in the pretreatment pool, successively enter thick, thin 2 grades of grating tank behind the solid weights such as removal sandstone, enter equalizing tank after removing the foreign material such as rope, cloth, fiber floc sedimentation, in equalizing tank, finish the homogeneous of water quality and the water yield and adjusting;
(2) physico-chemical precipitation is processed: the physico-chemical precipitation treatment system comprises preposition reaction tank and physico-chemical precipitation pond, and the washing Bleaching and dyeing sewage quantitatively enters reaction tank by equalizing tank, at first uses Ca (OH) in reaction tank 2The pH value of regulating water quality, adding bodied ferric sulfate makes sewage form the alumen ustum floc sedimentation again, sewage behind the good flocculation of the formation alumen ustum enters the physico-chemical precipitation pond and carries out solid-liquid separation, mud under the precipitation enters sludge thickener by driving scraping and sucking machine device and disposes to carry out press filtration, and supernatant liquor enters the bioselection pond;
(3) bioselection is processed: the supernatant liquor that physico-chemical precipitation obtains after processing and oxidation ditch aeration are processed the active sludge of the natural sedimentation pond backflow at rear, all enter the bioselection pond and carry out the bioselection combination treatment; The bioselection pond is mixed by the diving propelling stirrer, by top water inlet, bottom water outlet; Water outlet directly enters Improvement type oxidation ditch bottom water distributor;
(4) the Improvement type oxidation ditch aeration is processed: the Improvement type oxidation ditch adopts the bottom water intake mode, the strong aeration section that the sewage after bioselection is processed directly enters oxidation ditch; Aeration mode adopts low pressure mixed flow jet-flow aeration, need not plug flow device;
(5) natural sedimentation is processed: contain a large amount of active sludge in the water outlet of Improvement type oxidation ditch, realize solid-liquid separation through natural sedimentation, and with sludge reflux to the bioselection pond; The requirement that the clear liquor water outlet reaches " textile dyeing and finishing industrial water pollution emission standard " GB4287-92 enters water reservoir, but 60%-80% reuse workshop wherein, the 20%-40% qualified discharge.
The waterpower peak value residence time is designed to 3-5h in equalizing tank;
The reaction tank pH value is adjusted to 8.0~9.0, adds bodied ferric sulfate again and makes sewage form alumen ustum floc sedimentation, reaction times 8-12min; Reaction tank inlet velocity 1.5m/s, exit velocity 0.2m/s;
Physico-chemical precipitation pond design current velocity is 6mm/s;
The bioselection tank waterpower residence time is 15~25min.
The mixing reflux ratio of Improvement type oxidation ditch is the 60%-80% of flooding quantity; Organic loading is 0.5KgCOD/m 3.d, dissolved oxygen is controlled at 0.5-2mg/L;
In the bottom of oxidation ditch, the aerating apparatus that is made of external pressurized water pipe, compressed air pipe and ejector is arranged; This device fully mixes backward horizontal direction with the pressurized air of sending into pressurized water and sprays, and forms jet and mix and blend district, and water body is carried out oxygenic aeration.
The flow velocity in natural sedimentation pond is 6mm/s;
Physico-chemical precipitation pond and natural sedimentation pond are horizontal sedimentation tank or radial-flow sedimentation tank or vertical sedimentation tank.
The bioselection pond is that anaerobe is selected or aerobe is selected or the oxygen bioselection type of holding concurrently.
The present invention is directed to washing and bleaching and dyeing the large characteristic of industry water consumption; utilize physical chemistry technology, biotechnology to process the washing Bleaching and dyeing sewage; when the solution sewage disposal reaches the emission standard of " textile dyeing and finishing industrial water pollution emission standard " GB4287-92; realize that most of water satisfies the production reuse; can reduce the discharging of waste water; economize on resources; protection of the environment; it is low to have simultaneously cost of investment; energy consumption is low, and processing efficiency is high, and anti-load impact ability is large; sludge yield is low, but the high characteristics of middle water reclamation rate.
Description of drawings
Fig. 1 is the schema that the present invention washes the Bleaching and dyeing sewage treatment process.
Embodiment
Washing Bleaching and dyeing sewage treatment process of the present invention has been carried out organic combination to technology such as the coagulating sedimentation of maturation, oxidation ditch, oxidative decoloration, bioselections, and has been applied in the production practice.Adopt coagulating sedimentation preposition on the technique, by adding the bodied ferric sulfate with oxidative decoloration, not only realized the precipitation of suspended substance, solve the problem of washing Bleaching and dyeing sewage decolouring, also greatly reduced the load of follow-up biochemical treatment, improved the biodegradability of sewage, for follow-up aerobic reduction energy consumption provides the prerequisite basis, also reduce simultaneously the generation of mud, reduced the reagent cost of sludge press filtration, realized sludge reduction.
The bioselection pond is set before oxidation ditch process, forms dynamic (dynamical) rule and arrange according to the active sludge population.Create suitable microorganism growth condition and select the flocculence thread fungus, improve the stability of biosystem operation, can be fast, a large amount of domesticated strain, the structures of matter such as failure surface promoting agent, be conducive to subsequent oxidation ditch process operation, the bioselection pond also can suppress hyphomycetic amount reproduction effectively, overcomes sludge bulking.
The Improvement type oxidation ditch that the present invention adopts is a kind of complete hybrid-type ring aeration tank, in the aeration tank, by means of the absorption of aerobic microbiological, the effect of decomposing organic matter, makes the BOD of waste water 5, CODcr reduces, and adopts low pressure mixed flow jet Aeration Technology and Its, in the bottom of oxidation ditch, one group of aerating apparatus that is made of external pressurized water pipe, compressed air pipe and ejector arranged.This device fully mixes backward horizontal direction with the pressurized air of sending into pressurized water and sprays, and forms jet and mix and blend district, and water body is carried out oxygenic aeration.This Improvement type oxidation ditch has the characteristics such as cost of investment is low, power configuration is low, and aeration is abundant, and the utilization ratio of oxygen is high in the technique, and running cost is low, and treatment scheme is very simple, and the handiness of operation is more intense, and treatment effect is stable, and effluent quality is good.
In the end use application of the inventive method the treatment process of natural sedimentation, can not only be in time the activity sludge reflux of precipitation to the bioselection pond, also have the advantages such as simple in structure, that cost is low, deposition efficiency is high, simple to operate, convenient management, working cost are low.
The flow process that the present invention washes the Bleaching and dyeing sewage treatment process comprises following concrete steps:
(1) sewage pre-treatment: the sewage pre-treatment comprises pretreatment pool and equalizing tank; Washing Bleaching and dyeing sewage by escape canal at first enters the settling pit in the pretreatment pool, successively enter thick, thin 2 grades of grating tank behind the solid weights such as removal sandstone, enter equalizing tank after removing the foreign material such as rope, cloth, fiber floc sedimentation, in equalizing tank, finish the homogeneous of water quality and the water yield and adjusting; The waterpower peak value residence time is designed to 3-5h in equalizing tank;
(2) physico-chemical precipitation is processed: the physico-chemical precipitation treatment system comprises preposition reaction tank and physico-chemical precipitation pond, and the washing Bleaching and dyeing sewage quantitatively enters the water yield and the water quality of reaction tank when being adjusted in flow rate fluctuation by equalizing tank, at first uses Ca (OH) in reaction tank 2The pH value to 8.0 of regulating water quality~9.0 add bodied ferric sulfate again and make sewage form alumen ustum floc sedimentation, reaction times 8-12min, reaction tank inlet velocity 1.5m/s, exit velocity 0.2m/s; Sewage behind the good flocculation of the formation alumen ustum enters the physico-chemical precipitation pond and carries out solid-liquid separation, and design current velocity is 6mm/s; Mud under the precipitation enters sludge thickener and disposes to carry out press filtration, and supernatant liquor enters the bioselection pond;
(3) bioselection is processed: the supernatant liquor that physico-chemical precipitation obtains after processing and oxidation ditch aeration are processed the active sludge of the natural sedimentation pond backflow at rear, enter together the bioselection pond and carry out the bioselection combination treatment; The bioselection pond is mixed by the diving propelling stirrer, by top water inlet, bottom water outlet; The bioselection tank waterpower residence time is 15~25min; Water outlet directly enters Improvement type oxidation ditch bottom water distributor;
(4) the Improvement type oxidation ditch aeration is processed: the Improvement type oxidation ditch adopts the bottom water intake mode, the strong aeration section that the sewage after bioselection is processed directly enters oxidation ditch; Aeration mode adopts low pressure mixed flow jet-flow aeration, in the bottom of oxidation ditch, the aerating apparatus that is made of external pressurized water pipe, compressed air pipe and ejector is arranged; This device fully mixes backward horizontal direction with the pressurized air of sending into pressurized water and sprays, and forms jet and mix and blend district, and water body is carried out oxygenic aeration, need not plug flow device; The mixing reflux ratio of Improvement type oxidation ditch is the 60%-80% of flooding quantity; Organic loading is 0.5KgCOD/m 3.d, dissolved oxygen is controlled at 0.5-2mg/L;
(5) natural sedimentation is processed: contain a large amount of active sludge in the water outlet of Improvement type oxidation ditch, realize solid-liquid separation through natural sedimentation, and with sludge reflux to the bioselection pond; The flow velocity in natural sedimentation pond is 6mm/s; The requirement that the clear liquor water outlet reaches " textile dyeing and finishing industrial water pollution emission standard " GB4287-92 enters water reservoir, but 60%-80% reuse workshop wherein, the 20%-40% qualified discharge.
The present invention " physico-chemical precipitation pond " and " natural sedimentation pond " include horizontal sedimentation tank, radial-flow sedimentation tank and vertical sedimentation tank and various modification technique thereof.
The present invention " bioselection pond " comprises that anaerobe is selected, aerobe is selected and the oxygen bioselection type process of holding concurrently.
Below be a specific embodiment that adopts the technology of the present invention:
Yulin City of Guangxi Zhuang Autonomous washing bleaching and dyeing house mainly be engaged in clothes washing, bleaching and dyeing the production with technique, the principal pollutant in its waste water have slurry, dyestuff, auxiliary agent, tensio-active agent, resin, fiber foreign material etc.The factory effluent complicated component, pollution load is high, is acid, 30000 tons of day discharging water yields, COD600-1500mg/L, former water BC are than 0.3-0.45, and colourity 800-1200 is doubly.
Collect gravity flow from the washing Bleaching and dyeing sewage in each workshop by escape canal and enter settling pit, enter thick, thin 2 grades of grating tank behind the solid weights such as removal sandstone, grating tank arranges the mechanical grille machine, automatically sewage enters equalizing tank remove the foreign material such as rope, cloth, fiber floc sedimentation by the mechanical grille machine after, equalizing tank arranges pushing flow mixer, make sewage realize the homogeneous of water quality and the water yield and adjusting in equalizing tank, the waterpower peak value residence time of equalizing tank useful volume is designed to 3-5h;
Quantitatively take out sewage by sump pump from equalizing tank and enter reaction tank, add Ca (OH) by volume pump 2The pH value of regulating water quality reaches between the 8.0-9.0, metering adds bodied ferric sulfate again, make sewage form the alumen ustum floc sedimentation, reaction times is controlled to be 8-12min, reaction tank inlet velocity 1.5m/s, exit velocity 0.2m/s, sewage behind the good flocculation of the formation alumen ustum enters settling tank and carries out solid-liquid separation, mud under the precipitation enters sludge thickener and disposes to carry out press filtration, and supernatant liquor enters the bioselection pond, and the settling tank design current velocity is 6mm/s;
The supernatant liquor that physico-chemical precipitation obtains after processing and terminal natural sedimentation are processed the active sludge that refluxes and are carried out the bioselection combination treatment, intake by the top, pond, the bottom water outlet, the diving propelling stirrer is installed at the bottom of the pond, the bioselection tank waterpower residence time is designed to 15-25min, and water outlet directly enters Improvement type oxidation ditch bottom water distributor;
By the strong aeration section that the sewage behind the bioselection directly enters oxidation ditch, aeration mode adopts low pressure mixed flow jet-flow aeration mode, need not plug flow device, and mixing control of reflux ratio is the 60%-80% of flooding quantity, and the entering organic matter of water load is 0.5KgCOD/m 3.d, dissolved oxygen is controlled at 0.5-2mg/L;
Contain a large amount of active sludge in the water outlet of Improvement type oxidation ditch, realize solid-liquid separation through natural sedimentation, and with sludge reflux to the bioselection pond, the settling tank design current velocity is 6mm/s, the clear liquor water outlet reaches the requirement of " textile dyeing and finishing industrial water pollution emission standard " GB4287-92, but 60%-80% reuse workshop wherein, the 20%-40% qualified discharge.

Claims (10)

1. wash the Bleaching and dyeing sewage treatment process for one kind, it is characterized in that adopting following processing step:
(1) sewage pre-treatment: the sewage pre-treatment comprises pretreatment pool and equalizing tank; Washing Bleaching and dyeing sewage by escape canal at first enters the settling pit in the pretreatment pool, successively enter thick, thin 2 grades of grating tank after removing sandstone solid weight, enter equalizing tank after removing rope, cloth, fiber floc sedimentation foreign material, in equalizing tank, finish the homogeneous of water quality and the water yield and adjusting;
(2) physico-chemical precipitation is processed: the physico-chemical precipitation treatment system comprises preposition reaction tank and physico-chemical precipitation pond; The washing Bleaching and dyeing sewage quantitatively enters reaction tank by equalizing tank, at first uses Ca (OH) in reaction tank 2The pH value of regulating water quality, adding bodied ferric sulfate makes sewage form the alumen ustum floc sedimentation again, sewage behind the good flocculation of the formation alumen ustum enters the physico-chemical precipitation pond and carries out solid-liquid separation, and the mud under the precipitation enters sludge thickener and disposes to carry out press filtration, and supernatant liquor enters the bioselection pond;
(3) bioselection is processed: the supernatant liquor that physico-chemical precipitation obtains after processing and oxidation ditch aeration are processed the active sludge of the natural sedimentation pond backflow at rear, all enter the bioselection pond and carry out the bioselection combination treatment; The bioselection pond is mixed by the diving propelling stirrer, by top water inlet, bottom water outlet; Water outlet directly enters Improvement type oxidation ditch bottom water distributor;
(4) the Improvement type oxidation ditch aeration is processed: the Improvement type oxidation ditch adopts the bottom water intake mode, the strong aeration section that the sewage after bioselection is processed directly enters oxidation ditch; Aeration mode adopts low pressure mixed flow jet-flow aeration, need not plug flow device;
(5) natural sedimentation is processed: contain a large amount of active sludge in the water outlet of Improvement type oxidation ditch, realize solid-liquid separation through natural sedimentation, and with sludge reflux to the bioselection pond; The requirement that the clear liquor water outlet reaches " textile dyeing and finishing industrial water pollution emission standard " GB4287-92 enters water reservoir, but 60%-80% reuse workshop wherein, the 20%-40% qualified discharge.
2. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that the waterpower peak value residence time is 3~5h in equalizing tank.
3. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that reaction tank pH value is adjusted to 8.0~9.0, adds bodied ferric sulfate again and makes sewage form alumen ustum floc sedimentation, reaction times 8-12min; Reaction tank inlet velocity 1.5m/s, exit velocity 0.2m/s.
4. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that physico-chemical precipitation pond flow velocity is 6mm/s.
5. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that the bioselection tank waterpower residence time is 15~25min.
6. washing Bleaching and dyeing sewage treatment process as claimed in claim 1, the mixing reflux ratio that it is characterized in that the Improvement type oxidation ditch is the 60%-80% of flooding quantity; Organic loading is 0.5KgCOD/m 3.d, dissolved oxygen is controlled at 0.5-2mg/L.
7. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that in the bottom of Improvement type oxidation ditch the aerating apparatus that is made of external pressurized water pipe, compressed air pipe and ejector being arranged; This device fully mixes backward horizontal direction with the pressurized air of sending into pressurized water and sprays, and forms jet and mix and blend district, and water body is carried out oxygenic aeration.
8. washing Bleaching and dyeing sewage treatment process as claimed in claim 1, the flow velocity that it is characterized in that the natural sedimentation pond is 6mm/s.
9. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that physico-chemical precipitation pond and natural sedimentation pond are horizontal sedimentation tank or radial-flow sedimentation tank or vertical sedimentation tank.
10. washing Bleaching and dyeing sewage treatment process as claimed in claim 1 is characterized in that the bioselection pond is that anaerobe is selected or aerobe is selected or the oxygen bioselection type of holding concurrently.
CN 201210185137 2012-06-06 2012-06-06 Washing bleaching and dyeing wastewater treatment method Expired - Fee Related CN102674640B (en)

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Publication number Priority date Publication date Assignee Title
CN103011521A (en) * 2012-12-25 2013-04-03 绍兴县江滨水处理有限公司 Biological treatment method and biological treatment apparatus for strongly alkaline printing and dyeing wastewater
CN103435233B (en) * 2013-09-10 2015-03-18 北京英特环科水处理工程设备有限公司 Equipment and method for recycling chemical fiber continuous-spinning wastewater
CN103787553A (en) * 2014-02-12 2014-05-14 苏州龙杰特种纤维股份有限公司 Chemical fiber wastewater treatment process
CN108191164A (en) * 2018-01-30 2018-06-22 芜湖富春染织股份有限公司 A kind of dyeing and weaving wastewater treatment decoloring process
CN108529818B (en) * 2018-04-11 2020-11-10 嘉兴市金宇达染整有限公司 Dyeing and finishing waste discharge comprehensive treatment system
CN110983684A (en) * 2019-12-09 2020-04-10 浙江丝绸科技有限公司 Full-process circulating dyeing method and dyeing system for real silk fabric
CN111762938A (en) * 2020-06-27 2020-10-13 无锡夏利达漂染有限公司 Bleaching and dyeing sewage treatment process

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CN101560035A (en) * 2009-05-21 2009-10-21 潍坊金丝达印染有限公司 Printing and dyeing sewage recycling treatment method

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Publication number Priority date Publication date Assignee Title
CN101177316A (en) * 2007-10-18 2008-05-14 梁代福 Bleaching and dyeing sewage treatment water purification agent
CN101560035A (en) * 2009-05-21 2009-10-21 潍坊金丝达印染有限公司 Printing and dyeing sewage recycling treatment method

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