Metal Removal from Process Wastewater
Metal Removal from Process Wastewater
(OP)
Dear members,
I have been given an assignment to design a process for the following water condition and requirements. I don't have much experience in this field so any help about the overall process and equipment required would be highly appreciated.
Wastewater to be treated includes:
Average TSS: 250 mg/L
Maximum TSS: 500 mg/L
pH: 7.5
Dissolved Copper: 2.5 mg/L
Dissolved Zinc: 3.6 mg/L
Discharge requirement:
TSS: <300 mg/L
Total Copper: <1 mg/L
Total Zinc: <2 mg/L
Assume reduction of TDS is not required in order to meet the discharge requirements.
Thank you in advance for your cooperation.
I have been given an assignment to design a process for the following water condition and requirements. I don't have much experience in this field so any help about the overall process and equipment required would be highly appreciated.
Wastewater to be treated includes:
Average TSS: 250 mg/L
Maximum TSS: 500 mg/L
pH: 7.5
Dissolved Copper: 2.5 mg/L
Dissolved Zinc: 3.6 mg/L
Discharge requirement:
TSS: <300 mg/L
Total Copper: <1 mg/L
Total Zinc: <2 mg/L
Assume reduction of TDS is not required in order to meet the discharge requirements.
Thank you in advance for your cooperation.





RE: Metal Removal from Process Wastewater
There is no selective method to remove the metals without removal of the TSS.
RE: Metal Removal from Process Wastewater
Thank you for your response. I was wondering if you could give me a little more details about the process. For example what type of clarifier to be used and what chemicals to be added? Would a lime softener work in this case? Also isn't TSS too high to be handled with a media filter? Based on the research I did, typical TSS level to be handled by media filter is <100ppm. If that is true, can we use IGF/DAF instead of media filter?
Thanks again!
RE: Metal Removal from Process Wastewater
A gravity plate settler will provide satisfactory service as a clarifier. The effluent from any type of clarifier should typically be less than 10 mg/L.
Generally, the metal concentration in the effluent is the total of the dissolved metals and the metals contained in the TSS. It is essential to remove all of the TSS to produce a good effluent. For that reason, a multimedia filter is normally used.
RE: Metal Removal from Process Wastewater
First you can coagulate the TSS using some coagulant like PAC, and then you just have to give some floculant on it, Let it settle for 10 minutes. Do a quick filtration, using filter papper. And you will see the result.
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RE: Metal Removal from Process Wastewater
for pH correction Lime is cost effective but it produces too much of sludge and Caustic will be another option for sludge reduction.
Krunal Bhosale
http://waterengineer.co.in
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