How to Treat Electroplating Waste at Source?

Published on by in Technology

I am interested in reducing high levels of total dissolved solids (TDS) from electroplating waste. Is there a method which does not cost too much, other than dilution, to reduce TDS?

How can we separate the metals from waste water? What is the best method to recover them efficiently? 

Taxonomy

18 Answers

  1. With vacuum evaporation you can reach very high solid concentration and great amount of water saved. If Electrical consumption per liter seems higher in comparison to other filtration system, you have to consider the extremely different time and cost necessary for spare parts and maintenance stop. 


    There are no parts which required periodical stop for substituton, or expensive cleaning procedure and chemicals. Typical electrical consumption is 100-130 Wh/liter but it can be reduce to only 10-20 Wh/liter according to effluent amount, availability of hot-cold water in your factory.

    With more details of your request we can suggest proper solution.

  2. Usually membrane technology can help to resolve this problem. If NF or RO needs to be used, maybe with UF as pre-treatment, depends on the kind of components in this wastewater. So as first, beside the specification of the volume to be treated, a reliable analysis is necessary that needs to address all dissolved components, pH, temperature and electrical conductivity. Based on this information the solution has to be developed step by step, maybe leading to a zero liquid discharge (ZLD) process that allows to recover valuable components and clean water contributing thus to create an added value and avoid further pollution.

    Best regards

    Dr. Thomas Peters

  3. You may try Phytoremediation methods,

    First run the waste water through PH stablisation tanks.

    Next run this over a bioswale trench using concrete or HDPE liners to prevent leaching.

    There should be about 1000 mm gravel base and about 300-500 mm rootzone.

    Collect the treated wastewater and run the same in another bioswale.

    Repeat the treatment in third and fourth bioswale.

    You may use locally available fast growing plants that have fibrous roots and some tubers.

    Collect all the biomass and send it to a biogas chamber.

    Collect the sludge and incinerate.

    You shall be able to collect most of the metal lost and prevent the enviornmental damage.

    Hope you have the land and workforce available at low cost in your area.

     

  4. my friend,you are the best. i listen all your result ,struggling, etc in the issue of Water crises critic & their solution. if you now wants no wastage of time listen my one word stopped your all practice & see my Global scientist Development /Mazhar Hussain Syed Face Book .i do the best. we all shared this important issue only you stand as a silent mood no sound no etc, only you are my back bone and i will handled all issues & their result satisfied in my hand. i will give and take policy follower through International Research Centers ,i will proved the all 100% correct and in future my invention succeed to All Global Development countless Dollars Rupees growth in our hand & International level finance position growth well in strong high level ,no poor no handicap, all are never hungry thirsty through out this Global ,if homeless i will allot the home to all Global person. so do the best registered my Name in the List Of International Research Centers. & i want to attend conferences debates, meetings, etc but i want returned flight etc stay ,food ,breed, etc from International research centers . we will attend the same & moved to Global hit to global within a moment ,through my invention i will solved the many issues of Historical politics Issues also like Border issues all countries Border issues, no islamic Law&Order bind no any person bind any country allowed to all reason if any person do any anti Law&Order of that country that country allowed punished him but no blocked any person of any country reason if we all wants Global Development  all Countries all human Beings as a humanity Law&Order wants allowed to attend country as per any person desired. ther are countless progress i want like all Global Countries in one Palm.no separated from each & another all Blood are One no different Blood all Are Our home Members so all are our Blood  i wants these Worldwide Population ,Public Now-a-days enjoying in the womb ob Global are   1000 Millions numbers Blood  X  7 Liters  = 7000 Liters Blood In One Bottle meaning our total Blood are 7000Million Litters all are stored in one jar. no separated i wants satanic molecules Blood electrified through my Electrical process electrocution molecules pushed away & life molecules attracted in our all Global hand not for one moment but also lifetime of Global Lifetime.are you understand my quality,personality.you are my  Blood i am your Blood all are stored in one Body Language Blood Pure. so love are perfect make body perfect satanic molecules i will be electrufied through my process pushed away from our Blood quality,personality.

  5. my friend,you are the best. i listen all your result ,struggling, etc in the issue of Water crises critic & their solution. if you now wants no wastage of time listen my one word stopped your all practice & see my Global scientist Development /Mazhar Hussain Syed Face Book .i do the best. we all shared this important issue only you stand as a silent mood no sound no etc, only you are my back bone and i will handled all issues & their result satisfied in my hand. i will give and take policy follower through International Research Centers ,i will proved the all 100% correct and in future my invention succeed to All Global Development countless Dollars Rupees growth in our hand & International level finance position growth well in strong high level ,no poor no handicap, all are never hungry thirsty through out this Global ,if homeless i will allot the home to all Global person. so do the best registered my Name in the List Of International Research Centers. & i want to attend conferences debates, meetings, etc but i want returned flight etc stay ,food ,breed, etc from International research centers . we will attend the same & moved to Global hit to global within a moment ,through my invention i will solved the many issues of Historical politics Issues also like Border issues all countries Border issues, no islamic Law&Order bind no any person bind any country allowed to all reason if any person do any anti Law&Order of that country that country allowed punished him but no blocked any person of any country reason if we all wants Global Development  all Countries all human Beings as a humanity Law&Order wants allowed to attend country as per any person desired. ther are countless progress i want like all Global Countries in one Palm.no separated from each & another all Blood are One no different Blood all Are Our home Members so all are our Blood  i wants these Worldwide Population ,Public Now-a-days enjoying in the womb ob Global are   1000 Millions numbers Blood  X  7 Liters  = 7000 Liters Blood In One Bottle meaning our total Blood are 7000Million Litters all are stored in one jar. no separated i wants satanic molecules Blood electrified through my Electrical process electrocution molecules pushed away & life molecules attracted in our all Global hand not for one moment but also lifetime of Global Lifetime.are you understand my quality,personality.you are my  Blood i am your Blood all are stored in one Body Language Blood Pure. so love are perfect make body perfect satanic molecules i will be electrufied through my process pushed away from our Blood quality,personality.

  6. In electroplating industry the waste contains mainly metals and some undesired anions. Metals can be precipetated in an alkaline environment as all metal hydroxides are insoluble except the alkali group. If you've got cyanides then you need to oxidise them to cyanates which are harmless using NaClO at a pH around 10 and an ORP around 900mv. This is the basic method but it does depend on the concentration of the various pollutants in your waste water. If you've got a detailed analysis it would help a great deal.  

  9. Hi Mahesh!

    Practice of the resource efficient cleaner production (RECP) approach is proven to reduce the quantity as well as the toxicity of waste water in electroplating processes. Check out our project website www.acidloop.in wherein we report the approach, case studies and results from a EU SWITCH Asia project that ran from 2012 to 2016 at 6 locations in India - covering more than 100 metal finishing industries.  Please reach out to me if you need more information.

    Best,

    Rajat

  10. hi Mahesh, what is the pH of the electroplating wastewater. membrane technology can be used to reduce the TDS , directly with minimum pretreatment.

  11. hi Mahesh, what is the pH of the electroplating wastewater. membrane technology can be used to reduce the TDS , directly with minimum pretreatment.

  12. hi Mahesh, what is the pH of the electroplating wastewater. membrane technology can be used to reduce the TDS , directly with minimum pretreatment.

  13. Dear Mahesh,

    Electroplating industry consumes and discharge large volumes of wastewater.Use of various chemicals and metal salt creates pollution problems.Major pollution caused by rinse water, spray losses and solution dumping and leakages. Valuable metals and cyanide along with different chemicals used arelost in wastewater. The amount may be 2-20% of the chemicals used. Thereforegreater efforts shall be required to reduce the pollution problems. The effluent concentration depends on various factors such as surface area, shape of article thickness of solution, speed of removal, drain time etc. 

    Following method to minimise electroplating waste,

    1. COAGULATION AND PRECIPITATION
    2. Treatment with ferrous sulphate
    3. Treatment with sulphur dioxide
    4. Treatment with sulphuric acid
    5. Treatment with barium chromate
    6. Alkaline chlorination treatment
    7. Electrolytic decomposition method
    8. Evaporation
    9. Treatment with ozone

    The applicability of all these techniques depends on the type and scale ofoperationAll these methods of recovery are directly related to economy ofthe system in certain cases it is economical to treat the effluent rather than try to recover the metal. 

  14. You must isolate the process and not allow the electroplating waste to mix with water/ liquids of other processes. Once you isolate the batch process waste or effluent, opt for guaranteed specialised treatment with recovery of metals and lowering of TDS levels.. then only water can be recirculated or disposed off with other waste waters for usual treatment

  15. You can use our Capacitivie Deionization system to concentrate the nickel rinse water, feed back to plating bath, and use the clean water generated to supplement rinse water.  www.atlantis-water.com

  17. Physical/chemical treatment of plating wastes is a fairly common way to treat. Depending on they metals you want to remove, the pH will need to be monitored. ORP will be needed to feed in precipitant aids such as DTC or Sulfide. A polymer for building floc and a filter for solid removal will be needed as well. Generally speaking, we can get metals down from over a 1000ppm to under 1ppm with this process.