CN101318746B - Dyeing and printing, electroplating waste water recycling and processing technique based on membrane technology - Google Patents
Dyeing and printing, electroplating waste water recycling and processing technique based on membrane technology Download PDFInfo
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- CN101318746B CN101318746B CN200810123241XA CN200810123241A CN101318746B CN 101318746 B CN101318746 B CN 101318746B CN 200810123241X A CN200810123241X A CN 200810123241XA CN 200810123241 A CN200810123241 A CN 200810123241A CN 101318746 B CN101318746 B CN 101318746B
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Abstract
The invention relates to a treatment process for recycling dye printing wastewater and electroplating wastewater based on the membrane technology. The process comprises the following steps of (1) filtration and (2) reverse osmosis separation, wherein, in step one: standard wastewater discharged in the dye printing industry is filtered to remove suspended impurities in the wastewater and obtain primary recycling water; in the step two: the primary recycling water is continuously subject to reverse osmosis separation by a reverse osmosis separating system to produce a dialyzate and a concentrated solution; the dialyzate is directly used as water for the dye printing and electroplating processes; one part of the concentrated solution is directly discharged or discharged after treatment; and the other part of the concentrated solution and the primary recycling water are mixed and reenter the reverse osmosis separating system for carrying out reverse osmosis separation. The treatment process for recycling the dye printing wastewater and the electroplating wastewater has low operating cost, high utilization of the wastewater and long service life of a membrane, and water recycled by the process can be repeatedly used in the dye printing process.
Description
Technical field
The invention belongs to waste water treatment, resource recycling technical field, particularly relate to the resource recycling of printing and dyeing industry and electroplating industry waste discharge.
Background technology
China is textile printing and dyeing big country, and according to incompletely statistics, about 300～4,000,000 tons/year of China's dyeing waste water quantity discharged every day accounts for 5% of trade effluent.Because the restriction of gross contamination emission control and the needs of the conserve water energy, printing-dying wastewater recycling are handled and seemed very necessary and important,, become the conditionality factor of dyeing development in certain areas.Therefore, the domestic and international research of all being devoted to printing-dying wastewater recycling.
Membrane sepn since have no phase transformation, less energy-consumption, unit scale according to treatment capacity require changeable and equipment is simple, easy and safe to operate, start soon, advantages such as serviceability is high, free from environmental pollution, less investment, and be widely used in being used in each field the separation and the purification of material.In printing and dyeing, electroplating industry, membrane separation process is can hold back the organism of different molecular weight size by the difference of membrane pore size size, thereby it is removed from water, reduces the COD of water outlet.Therefore, membrane sepn is to decide according to organic molecular weight in different types of film and the waste water to removal effect of organic matter.Though can polluting the film of general material, organism (comprises, microbial contamination that causes because of organism etc.), but,, adopt membrane process to come the practical engineering application of degradation of organic waste water also more and more along with reaching its maturity of advanced membrane techniquies such as special membrane, pollution-resistant membrane.
At present, in the dyeing, the main membrane separation technique that adopts two embrane methods (being ultrafiltration+reverse osmosis).But, owing to added a large amount of polymeric flocculants in a large amount of auxiliary agents (permeate agent, dyeing auxiliaries etc.) that use in printing and dyeing, the electroplating industry processing and the wastewater treatment process, having more than 95% all is trapped in the waste water, the working strength of ultra-fine filter and reverse osmosis membrane is big in the waste water recycling membrane technology, the performance degradation of ultra-fine filter and the cleaning frequency of reverse osmosis membrane have been aggravated, shortened the life-span of ultra-fine filter and reverse osmosis membrane greatly, strengthened the working cost of wastewater treatment equipment on the other hand, final feasible recovery dyeing waste water cost is very high, is unsuitable for applying.
Summary of the invention
Technical problem to be solved by this invention provides printing and dyeing, the electroplating waste-water reutilizing treatment process that a kind of running cost is low, the water reuse rate is high, and the water after this technology reclaims can be recycled and reused in printing and dyeing, the electroplate technology.
For solving above technical problem, the technical solution used in the present invention is:
A kind of printing-dying wastewater recycling treatment process based on membrane technique comprises the steps:
(1), filter: printing and dyeing, electroplating industry emission standards waste water are filtered, and the suspended impurity of removing in the waste water obtains elementary reuse water; (2), reverse osmosis isolation: described elementary reuse water carries out reverse osmosis isolation by the reverse osmosis membrane separation system continuously and gets dialyzate and concentrated solution, this dialyzate directly as printing and dyeing or electroplating water,
Described reverse osmosis membrane separation system comprises fresh feed pump system, reverse osmosis membrane apparatus and dense water circulation system, Waste Water Treatment is directly discharged or partly be back to the part of described concentrated solution, or carry out advanced oxidation and handle the back discharging, another part, reenters reverse osmosis membrane apparatus and carries out reverse osmosis isolation with after elementary reuse water mixes by described dense water circulation system.
Preferably, during filtration, printing and dyeing industry emission standards waste water at first by more medium filter, is removed bigger suspended particle, by fiber ball filter less suspended particle is removed then, described bigger suspended particle is meant that particle diameter is more than or equal to 5 microns particle.
Described fresh feed pump system comprises low-pressure pump and high pressure charging pump, before carrying out reverse osmosis isolation, carry out pre-filling by low-pressure pump to reverse osmosis membrane apparatus and dense water circulation system, when reaching set(ting)value, the high pressure charging pump is started automatically, and this moment, reverse osmosis membrane apparatus transferred out elementary reuse water.
Variable frequency control equipment is set in dense water circulation system, and the amount and the adjustment pressure of control reverse osmosis membrane apparatus internal recycle waste water wash away to guarantee that the film surface energy obtains adhering to specification, and prevent that the quick dirt of film is stifled.
Described reverse osmosis membrane apparatus adopts anti-oxidant reverse osmosis membrane.When film is subjected to organism and bacterium severe contamination, can adopt the purging method of oxidation.
This printing-dying wastewater recycling treatment process also comprises step (3), promptly adopts the back flushing mode that reverse osmosis membrane apparatus is washed.
Most preferred flushing operation is: every interval was just washed reverse osmosis membrane apparatus in 2～3 hours, during flushing, stopped the high pressure charging pump, used low-pressure pump to pump into elementary reuse water in reverse osmosis membrane apparatus, and reverse osmosis membrane apparatus is carried out the low pressure back flushing.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
Concentrated solution after the reverse osmosis isolation is not all directly to be discharged in the environment, but most by the recycle system, after elementary reuse water mixes, carry out reverse osmosis isolation again, first has avoided utilizing in the conventional art water purification to solve membrane pollution problem in the reverse osmosis link, has saved the water purification usage quantity; Secondly improve the concentration of the dense water that discharges; improve the pure water water production rate; also the energy to the waste-water high-pressure discharging has carried out partially recycled; the dirt that has reduced film again is stifled; prolong the work-ing life of film, promptly reduced running cost, when improving the water reuse rate, saved water resources; not only improve the economic benefit of printing and dyeing, electroplating industry, all played promoter action for protection environment, reduction energy consumption, raising social benefit.
Description of drawings
The present invention will be described in detail below in conjunction with accompanying drawing and concrete embodiment:
Accompanying drawing 1 is a process flow sheet of the present invention.
Embodiment
As shown in Figure 1, the primary standard waste water that at first printing and dyeing, electroplating technology is discharged filters.
Waste water passes through more medium filter successively, fiber ball filter, by behind the more medium filter, particle diameter is removed substantially more than or equal to 5 microns suspended substance in the waste water, and fiber ball filter forms with the fiber yarn ligation, has good springiness, acid and alkali-resistance, the non-rising water surface, voidage is big, work period is long, advantages such as the head loss is little, in filtration procedure, the filtering layer space diminishes gradually along water (flow) direction, comparison operators closes on the ideal filtrate big, little down space distributes, the efficient height, filtering velocity is fast, and retaining power is big, to the organic removal rate height, behind fiber ball filter, suspended substance more than 1 micron and partial organic substances in the waste water are removed, and obtain elementary reuse water.
Secondly, above-mentioned elementary reuse water is further carried out reverse osmosis isolation.
After above-mentioned elementary reuse water further separates by the reverse osmosis membrane separation system, see through the requirement that liquid can reach printing and dyeing, electroplating technology water.But reverse osmosis membrane in use, problems such as a series of antiacid alkali that exist, erosion resistance as film pollution, membrane flux, film cleaning and membrane material, cause single membrane separation technique to handle printing and dyeing, electroplating wastewater, reclaim pure dyestuff, also exist a series of problems such as Technological Economy.And in dyeing processes process permeate agent, dyeing auxiliaries, polymeric flocculant etc. by a large amount of uses, and have 95% to be present in the waste water and to be discharged, along with quantity discharged is increasing, strengthened the working load of " film ", the film surface forms " thing mud ", and then influence membrane flux, film system cleaning technique difficulty is big, and the backwash water amount is big, and membrane lifetime shortens, a series of problems have improved the cost of reuse water, also cause the waste at water source.
In order to overcome and to address the above problem, in the wastewater recycling treatment process of present embodiment, the reverse osmosis isolation step has been done following improvement:
Elementary reuse water carries out reverse osmosis isolation by the reverse osmosis membrane separation system continuously and gets dialyzate and concentrated solution, this dialyzate is directly as printing and dyeing, electroplating water, concentrated solution is not directly to be fully discharged in the environment, but increased dense water circulation system, make the part of concentrated solution with after elementary reuse water mixes, reenter the reverse osmosis membrane separation system, when realization is washed away the big flow of reverse osmosis membrane, also improved the rate of recovery, so, first has avoided utilizing in the conventional art water purification to solve membrane pollution problem in the reverse osmosis link, has saved the water purification usage quantity, secondly, improve the concentration of the dense water that discharges, improve the pure water water production rate, promptly saved running cost, when improving the water reuse rate, saved water resources.
In this example, the reverse osmosis membrane separation system comprises fresh feed pump system, reverse osmosis membrane apparatus and dense water circulation system, described fresh feed pump system comprises low-pressure pump and high pressure charging pump, before carrying out reverse osmosis isolation, starts low-pressure pump, when the pressure reduction of reverse osmosis membrane apparatus water inlet water outlet reaches established standards, the recycle system begins to utilize the dense water low-pressure washing of dense water side film, reaches the effect of flushing membrane on the one hand, discharges suitable dense water on the other hand, dilute dense water side concentration, reduce dirt settling.Low pressure recycle is after for some time, and the paramount pressure fresh feed pump of pressure that improves low-pressure pump is activated, and carry elementary reuse water by the high pressure charging pump to reverse osmosis membrane apparatus this moment.
For steadily controlling the pressure of the waste water that enters membrane separation unit, in dense water circulation system, be provided with variable frequency control equipment.So, also can play the use power of the motor that falls elementary reuse water water inlet place driving high pressure charging pump work, the quality of protective membrane.
As mentioned above, the cleaning of film is very crucial, is to have adopted following cleaning way in this example:
Every interval 2 hours, stop the high pressure charging pump, in reverse osmosis membrane apparatus, import elementary reuse water by low-pressure pump, film is washed away, the back flushing mode of Cai Yonging particularly, be that elementary reuse water is imported from the concentrated solution outflow side, discharge that back flushing can effectively solve the mechanicalness of film and stop up from the inlet of reverse osmosis membrane apparatus; Adopt elementary reuse water to replace pure water and clean, can reduce the pure water consumption, save energy and reducing cost.
For adapting to the requirement of printing and dyeing, electroplating wastewater, above-mentioned film is selected the antioxygen reverse osmosis membrane.
The effect that this routine described technology is handled dyeing waste water illustrates as follows;
For example: 10000 tons of/day printing-dying wastewater recycling dispositions such as table 1.
Table 1
| The water quality situation | Dyeing waste water | Reuse water | The condensed water of discharging |
| The water yield | 10000T/D | 6700T/D | 3300T/D |
| CODcr： | ≤100mg/L | ≤5mg/L | ≤400mg/L |
| SS | ≤50mg/L | ≤1mg/L | - |
| Colourity | ≤70 | ≤1 | - |
| Turbidity | - | ≤1 | - |
Owing to use dense water cycle to wash away film, when improving the pure water water production rate, the waste strength of its discharging increases, and COD content is 3～4 times of water into, and saltiness also increases by 3～4 times, discharges after can adopting the method for advanced oxidation to reduce COD.
In sum, avoided cleaning, adopted more medium filter and fiber ball filter cheaply, met of the requirement of follow-up link fully on the one hand, also reduced equipment and running cost the waste water index to ultra-fine filter in water inlet pre-treatment link; In the dense water circulation system that the dense water side of reverse osmosis membrane is installed, joint solves membrane pollution problem, has saved the water purification usage quantity, secondly improve the concentration of the dense water that discharges, improve the pure water water production rate, promptly saved running cost, when improving the water reuse rate, saved water resources.Not only improve the economic benefit of printing and dyeing, electroplating industry,, improve social benefit and all played promoter action for the protection environment.
Claims (8)
1. printing and dyeing based on membrane technique, electroplating waste-water reutilizing treatment process, comprise the steps: (1), filter: printing and dyeing, electroplating industry emission standards waste water are filtered, and the suspended impurity of removing in the waste water obtains elementary reuse water; (2), reverse osmosis isolation: described elementary reuse water carries out reverse osmosis isolation by the reverse osmosis membrane separation system continuously and gets dialyzate and concentrated solution, this dialyzate directly as printing and dyeing or electroplating water,
It is characterized in that: described reverse osmosis membrane separation system comprises fresh feed pump system, reverse osmosis membrane apparatus and dense water circulation system, Waste Water Treatment is directly discharged or partly be back to the part of described concentrated solution, or carry out advanced oxidation and handle the back discharging, another part, reenters reverse osmosis membrane apparatus and carries out reverse osmosis isolation with after elementary reuse water mixes by described dense water circulation system.
2. a kind of printing and dyeing according to claim 1, electroplating waste-water reutilizing treatment process based on membrane technique, it is characterized in that: in the step (1), printing and dyeing, electroplating industry emission standards waste water at first pass through more medium filter, remove bigger suspended particle, by fiber ball filter less suspended particle is removed then, described bigger suspended particle is meant that particle diameter is more than or equal to 5 microns particle.
3. a kind of printing and dyeing according to claim 1, electroplating waste-water reutilizing treatment process based on membrane technique, it is characterized in that: described fresh feed pump system comprises low-pressure pump and high pressure charging pump, before carrying out reverse osmosis membrane separation, pump into elementary reuse water by low-pressure pump to reverse osmosis membrane apparatus, carrying out low pressure recycle washes away, simultaneously under the effect of recycle pump, the requirement that the water yield can reach setting is washed away in circulation, high pressure charging this moment pump is started automatically, and reverse osmosis membrane gives reuse water under the effect of high pressure charging pump.
4. a kind of printing and dyeing based on membrane technique according to claim 3, electroplating waste-water reutilizing treatment process is characterized in that: variable frequency control equipment is set, the amount and the adjustment pressure of control reverse osmosis membrane apparatus internal recycle waste water in dense water circulation system.
5. a kind of printing and dyeing based on membrane technique according to claim 3, electroplating waste-water reutilizing treatment process, it is characterized in that: described reverse osmosis membrane apparatus adopts anti-oxidant reverse osmosis membrane.
6. a kind of printing and dyeing according to claim 1, electroplating waste-water reutilizing treatment process based on membrane technique, it is characterized in that: these printing and dyeing, electroplating waste-water reutilizing treatment process also comprise step (3), promptly adopt regularly the back flushing mode that reverse osmosis membrane is washed.
7. a kind of printing and dyeing based on membrane technique according to claim 6, electroplating waste-water reutilizing treatment process, it is characterized in that: elementary reuse water is used in described flushing.
8. a kind of printing and dyeing according to claim 7, electroplating waste-water reutilizing treatment process based on membrane technique, it is characterized in that: every interval was just washed reverse osmosis membrane in 2～3 hours, during flushing, stop the high pressure charging pump, use low-pressure pump in reverse osmosis membrane apparatus, to pump into elementary reuse water, reverse osmosis membrane apparatus is carried out low-pressure washing.
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| CN101318746B true CN101318746B (en) | 2011-01-19 |
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| CN102086051A (en) * | 2010-12-16 | 2011-06-08 | 北京中兵北方环境科技发展有限责任公司 | Dynamic continuous self-cleaning ultrafiltration device |
| CN103449632A (en) * | 2013-09-02 | 2013-12-18 | 苏州富奇诺水治理设备有限公司 | Treatment method of soy sauce wastewater |
| CN110127938A (en) * | 2019-05-10 | 2019-08-16 | 苏州昌泽环保工程科技有限公司 | Waste water treatment system and processing method |
| CN115367900A (en) * | 2022-09-01 | 2022-11-22 | 无锡东元环境科技有限公司 | Nickel electroplating wastewater recovery process |
| CN117303474A (en) * | 2023-10-07 | 2023-12-29 | 无锡善境环保设备有限公司 | Process for recycling water and nonferrous metal main salt solution and extracting nonferrous metal in water washing tank |
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Owner name: SUZHOU HUACHEN WATER TREAT FACILITIES CO., LTD. Free format text: FORMER NAME: TAICANG HUACHEN WATER TREATMENT FACILITIES CO., LTD. |
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Address after: 215434 No. 16 Hongyun Road, pontoon bridge, Taicang, Jiangsu Patentee after: TAICANG HUACHEN DECONTAMINATE DEVICE CO., LTD. Address before: 215434 Zhongxing Road, Taicang port, Jiangsu Patentee before: Taicang HuaChen Water Treatment Facilities Co., Ltd. |