You can also try ozonation.

There are many ways in waste water treatment technologies. The most common is use of carbon black, but the emulsion can cause a problem. Second type of technologies used iron sulfate with hydrogen peroxide (Fenton reaction) for decolorisation and simultaneous floculation. Recently, there are developed new advanced oxidation technologies where colorised waters are anodically oxidated.

Hi

As publications literature showed, may be the flocculation/ coagulation, advanced oxidation, and adsorption are useful.

Use adsorbents which has mostly micropores.

Colour usually is generated by double bonds (C=C). In those cases, ozone is a good option to break those bonds. If the BOD also is very high, it should be consider the combination of ozone and some biological treatment to reduce operative costs.

Depends on the volume of water, the costs of chemicals and the involvement of the plant.

Generally speaking:

a) mititgation. If there is colour in the waste wter someone is not holding back things that might be of value

b) ozonisation destroying most compounds a follow up bioreactor usually makes sense

c) reverse osmosis with the chance to up concentrated things and eventually re-use. -- have fun

Basically, you'd better to know how the color comes from. this is the first step. then you can make the choice for your method to decolor.

1. Adding flocctant

2. oxidization to destroy the color component, Ozone, H2O2 and other additives.

3. adsoprtion+filtration

4. other possible method like NF,ED, RO and so on

Thanks for all your replies.

Volume is around 1500mklto 2000kld.

I heard that by evaporating or treating with some acid that might be used in some adhesives. Is some have any idea of it???

Why you want to remove the color from waste? Usually if it is a waste you cannot throw away as it is even if you decolorate it. And if you do not know how to remove the colour from the water it means that you are not qualified to manage the waste...

The most common industrial method is adsorption. and also the compound can be removed by microbial method and oxidation method.

why not we opt for Enaaopration technique?? and please give me more detail on microbial method??

You could consider Advanced Fenton using zero-valent iron in place of ferrous with, if necessary, ultrasound/hydrocavitation or hydrocavitation produced by high-shear stirring. First though, try filtering through carbon granules. In the past those made from peat by Norit-Clydesdale have proved to be particularly effective.

You could try activated carbon. Activated carbon can be used to remove impurities and color from water. A link is provided for your information.

http://www.norit.com/

Upon my experience, althought you can try activated carbon like a "reference adsorbent", you should know if your colours are positively or negatively charged.

What is really effective at a very low/no at all cost, it's to use dried agroindustrial wastes (such as spent coffee grounds, spent tea leaves, exausted lemon peels.....) as adsorbent or your pollutants.

If you can provide more information about your colourants, I can suggest you the best cheap adsorbent for your case.

I looked at using activated carbon or oxidation to treat wastewater from polymer manufacturing. It is difficult to remove a specific compound in a high TOC mixture using AC. I also had problems with ozone generating foam. I expect that you would have the same experience. UV/H2O2 oxidation worked the best and increased the biodegradability as well. The results were published in Water Environ. Res. 80(4), 373, 2008, you can get a copy from RG page if you are interested.

I think reverse osmosis would be a good choice however the membrane used would get damaged very easily by the chemicals present in the water and this could increase the running cost of the equipment. A good membrane could however give a long life time. The exact nature of chemicals present in the water will have to be known to find the right membrane material to use for reverse osmosis.

Greg is right, if you don't want to adsorb, you can try UV/H2O2 oxidation.

For some references (azo dyes from the Reactive series), you can see:

DOI:10.1016/j.jenvman.2013.04.023 and DOI:10.1080/19443994.2013.787553

Article Evaluation of UV/H2O2 advanced oxidation process (AOP) for t...

And the other one.

Don't hesitate if you need something more.

Article Response surface methodology (RSM) analysis of photodegradat...

Without knowing anything about the source of the color, try in the lab a column packed with ground bagasse. Be sure to slurry pack the column because if dry packed, the bagasse will swell in water so much that there is almost no flow. You should be able to get bagasse for almost free because it is an agricultural waste product. Also try chitin, another waste product. If you want to try something a bit more expensive but that might have better dye adsoprtion capacity, try chitosan.

I would try filtering through activated carbon or peat granules first. It will most likely not remove all the colour but it will be a good starting point. From there you will need further treatment but this further treatment will be less intense and cheaper since you have essentially pre-treated the water with carbon.

Http://www.ias.ac.in/matersci/bmsoct2009/499.pdf

You may consider using coal as a sorbent. A key aspect, as mentioned by others, is the charge of the dye. Coal can either be negatively charged or it can be negatively charged below pH 6-7 and positively charged above pH 7. This depends on the availability of carboxylic functional groups. Subbituminous coal tends to be negatively charged and a good adsorbent for positively charged ions (e.g. crystal violet). Our experience with Crystal Violet is that the ion diffuses into the coal and becomes irreversibly removed from solution. This is not necessarily the case with other sorbents. Coal can be combusted as a final step to incinerate the waste and generate energy. Finally coal is widely available and much cheaper than activated carbon.

If you have an emulsion, electro-coagulation works best to break it up. The hydrogen gas micro bubbles will promote flotation. See the attached paper.

you can easily try Nanofiltration and/or Ozone (O3).

You can try water in supercritical conditions.

The practical solution at commercial level in Asian countries is chemical coagulation combined with carbon/s and filtration. The final stage can be membrane technology, if required.

You can try using agricultural waste as sorbent to remove the color

Going almost blind try the use of adsorbents such as MOFs activated carbon or zeolites. Otherwise try ozone. Hope this helps.

Some oxidation processes like ozonation can be an option followed by adsorption. http://www.yarbis.yildiz.edu.tr/web/userPubFiles/ukurt_ae155d878f4953b4e6ef1cf8ee9ad1be.pdf

I had some good results with electrocoagulation to destroyed some biological dyes (smirnoff A dye). I suggest you look more into this technique. Try a tabletop unit first and see what it can do for your effluent.

Many treatment alternatives available for the treatment of wastewater containing colour from polymer/emulsion. Chemical and physical methods such as coagulation, adsorption, reverse osmosis and ultra filtration were effective; however, these treatment methods requires post-treatment of solid wastes. Advanced oxidation processes (AOP) involving O3, O3/H2O2, O3/UV, UV/H2O2, O3/UV/H2O2 and Fe2+/H2O2 have been considered as an emerging technology. Unfortunately, AOP alone demanding higher chemicals that eventually induced higher costs of wastewater treatment operation. I suggest using the combination of AOP and biological treatment. In this combination, AOP increase the biodegradability of the colourant,, which eventually degrading in biological treatment.

There is a novel method we are developing at UAB that combines the efficiencies of AOPs and low cost of coagulation. Please do not hesitate to contact me if you may be interested...

Adsorptive removal of direct azo dye from aqueous phase onto coal based sorbents: a kinetic and mechanistic study.

Venkata Mohan S, Chandrasekhar Rao N, Karthikeyan J.

Source

Biochemical and Environmental Engineering Group, Indian Institute of Chemical Technology, Hyderabad-500007, India. [email protected]

This reference using a chemisorption technique appears to have the required properties.

Try water hyacinth ash. reported to effectively adsorb phenol

1) photo Fenton + Activated sludge or 2) coagulation + flocculation w/jar tests on TOC, and color

Any simple operation cannot treat your waste water completely. from the information given in question, i assume that your sample contains water soluble lower hydrocarbons and water insoluble higher hydrocarbons(fragments of polymer). so you can design a two step treatment plant, where in step-I you can remove higher hydrocarbons from water by passing through adsorption column (filled with sand/fly ash/sawdust/coal etc). The water obtained from step-I contains smaller hydrocarbons like formaldehyde, soluble starch etc ., which you can oxidize by simple addition KMnO4. After one or two days you can see clear water on the top and black oxidized product at the bottom. The sand/fly ash from adsorption column containing higher hydrocarbons can be used as fuel after proper drying.

Advances oxidation process of course, with these you can degradate a lot of organical matter...

Enzymatic reaction can degrade polymer or oil and the polymer will separate in two layer aqoues oil phase at the same time colour change.

Homogeneous or heterogeneous catalytic ozonation can provide a rapid way to remove the color and organic matters.

I would add to the previous answer.... that it is possible to use an "homogeneus-like" catalytic ozonation.... by implementation of magnetic nanoparticles where the catalytic reaction take place.

For better understanding about this process and all the advantages, see our recent works or feel free to ask here.

Hi,

Just pass through a charcoal filter. It is an old fashion way but worked for me most of time in the lab..

I have developed resins with both polar and non polar ends you can use it for column sorption for all types of contaminants.

Hi

Firstly, you should make analysis of the effluent to determine the major pollutants , also you should know the quantity of effluent per hr or per day after that you can choose the proper method depending on the coast, time and easy to treet

Adsorption of color by activated carbon is the most effective process to remove color from wastewater. There are several low-cost adsorbents that can be used for this purpose as kaolin, sewage sludge, and activated carbon from several agricultural solid waste.

Youy can opt for adavance oxidation process followed by adsorption on activated charcoal/ fly ash column

Membrane ultra-filtration. If micron-sized particles are present then pre-treat with a membrane micro-filtration. As to the membrane material, I am not sure, maybe a ceramic membrane.

You can subject your waste water to Membrane Distillation process, it will reject all contaminants and give you fresh water. See my publications.

Color removal of dyes could be made using several methods including adsorption, advanced oxidation and coagulation. The choice of the method depends on the nature of the dyes and the presence of other pollutants

Try electrogoagulation which is an effective , cheap method of removing color from waste water . It has another advantages that it removes suspended matter , some impurities and does not add any chemical to the water. compares with chlorination for example .

i agree with Khorfan but it is not a cheap method. its economical part must be considered by local energy costs and technical feasibility. for example it is good method for treatment in Russia due to environmental parameter

For me your question can not be completely answered just by posting on this networking system . What you have asked can be a research title.But just to contribute what I have for the question. The first step is to charachterize the wastewater this helps you for example to know the pH and the presence of other similar substances in the wastewater . Knowing the property of the color is also very important . Then come choosing the method based on the facility you have . Currently there are many techenologies for color removal . For example adsorption using activated carbon or diffrent locally available materials is forwarded by many researchers. Five years before during my masters thesis for example , I found the by product of sulfuric acid and alum manufacturing indsutry , which is found in Ethiopia is effecient for removal of color . Similarly the others also proved this for diffrent types of colors. In general a research approach is required here .

good luck with your work

You can also try ozonation.

Please notice you can find Ozone, ClO2 and other methods to De-color. If you want remove dyes, you'd better combine other method.

As others mentioned, activated carbon is the most effective method, however sometimes it may be too expensive to be feasible in scales larger than lab scale. Another effective way is membrane filtration, however you need to know the MW of the coloring compound, and also membranes need to be protected from severe fouling.

De-Color is not exactly same as remove the dye. Depend on your requirement, you can choose the process: Absorption-Membrane filtration-Ozone or other combinanation.

Adsorption with different adsorbents can remove the color from wastewater. There are several adsorbents as activated carbon, clay, kaolin, bentonite, fly ash and others from agricultural wastes. All are of low cost of adsorption technique. You can load my book at the website http://www.intechopen.com/books/organic-pollutants-monitoring-risk-and-treatment .

Agree with Chaoyang Feng. If you only want to decolorize the dye waste then ozonation may work.

I have worked with wastewater from textile industry using three stages treatment starting with SBR system followed by fenton reagent and finally coagulation. I found that coagulation was the most effective in removing the colour.

Try Poly-aluminium chloride (PAC) as coagulant for color removal.

I agree with Hooshyar

If energy is cheap in your region you can use electrochemistry (such as electro coagolation or electro fenton) if not you can use adsorption or coagolation

I agree with Mahdi. You can try also peroxicoagulation, a process combining Electro-Fenton and coagulation in a single step, which is described in some of our papers...

Cost effective method is activated charcoal. Other methods you can try are with ozone,hypochlorides and coagulation with poly halides.

Colour or COD removal? Colour removal from dye-house is different from polymers emulsion manufacturers. We must ensure that the method(s) being proposed must really remove not only colour but other components also. Chances for colour causing dye molecules to get attached(Adsorbed -partially or fully) to these emulsions need to be observed and then methods are to be planned. Second aspect is Single method may not be helpful or economical. Hence try to consider electrochemical, microbial, etc etc methods.

Removal of dye from waste waters can be achieved by using adsorption methodology which is highly effective and economical and may involve low cost adsorbents derived mainly from locally available waste materials especially agricultural waste, such as, coir pith, pine tree bark, meranti wood, Moringa oleifera bark, M. oleifera leaves powder, Candida albicans biomass, tea factory waste, dehydrated wheat bran carbon, dehydrated peanut hull etc.

By adsorption techniques using Activated Carbon

The color can be changed by changing PH of the solution. Decoloration is also possible with some bacterial species biochemistry & Microbial Depts. will help you..

You can use activated carbon followed by ozonation and uv irradiation

Functional polymer adsorbents we have developed via radiation grafting process have been found to be very effective for removal of ionic dyes from industrial effluents...

i Agree with Badal Bhattacharya colors can be removed by activated charcoal or  with ozone, hypochlorides and coagulation with poly halides. 

Thanks for supporting my answer. Sharing of knowledge will help young researcher. With best regard.

Prof. Badal Bhattacharya

In my opinion you can use polyurethane as a solid phase extractor  in column mode.

Advance oxidation processes (AOP) like ozonation, hydrogen peroxide, UV may help to remove the color of wastewater.

Percolation of the water sample through homogeneous packed column filled with solid adsorbent at reasonable flow rate may do the jop