It depends on the nature of wastewater you deal with.

Did u performed any experiment on any type of wastewater?

Adsorption batch experiments

Adsorption batch experiments were carried out by shaking a series of bottles containing various amounts of each of the low-cost adsorbents and heavy metal ions at different pH. The pH of the slurry should be adjusted to the desired value in the range of 2–10 and then agitated in a shaking bath at (25 ± 3 °C) for 20 min until the pH was stabilised. Then, the nickel, iron and copper ions in the form of CuSO4·5H2O, (NiNO3)2·6H2O, FeSO4·7H2O were added to the bottles to make initial concentrations of 5–30 mg/L and the bottles were further agitated for 2 or 2.5 h until equilibrium was obtained. The residual concentration of heavy metals was determined by an atomic absorption spectrometer. In addition to adsorption tests, a set of blank tests of low cost were conducted in order to evaluate the removal by metal hydroxide precipitation at various pH’s.

You can try microbial remediation of heavy metal removal from waste water by using Filamentous Fungi, bacteria.

If only physical adsorption is aimed then trying out adsorbents like activated carbon could help in pilot scales, also regeneration of AC is a simpler process.

Did you used living biomass or dead biomass for experiment?

Mr. Anuj, Is it an industrial effluent? what is the pH of the waste water? What are the constituent your expecting from the sample? have a look on this question then go for the acid digestion. In my view it is necessary to do the acid digestion to avoid the precipitation of certain elements. We have done such kind of analysis in our lab.

If you do acid digestion to your sample it is good to get better results. Before that you have to consider the constituent of your sample i.e for ex. if your having Pb in your sample, then if you use HCL you will get error results. So, keep this things in you mind then proceed. Is it a

Biomass or dead biomass is not a good idea to deal with industrial fluent. The secondary pollutant will cost much more. Renewable adsorbent material, including powder, resin and membrane, has a better performance on removal metal ions.

The answer depends whether you want to determine total or dissolved metal concentration. If you digest your sample (dissolve solids with acid and possibly heating) you get total metal amount. If you filter your sample with 0.45 micrometer membrane filter, you get dissolved metals. After filtration, you should add small amount of analytical grade acid to keep metals from precipitating.

I studied emergent macrophyte (Phragmites and Spartina genus) for tertiary removal of heavy metals from sludges and wastewaters.    The various parts of the plant will concentrate different metals in their tissues (seeds, roots, tassels, stems) that can then be extracted (digested) to recover the metals or simply sanitary landfill them to remove metals.  Have a whole Masters Thesis on this process.

It is depend upon type of waste water and  type of metals of interest.

Hi,

I performed batch mode in real wastewater for removal of boron by using zeolite as adsorbent material, the result was good. Removal percentage was 50% in my work, so i expect that batch mode gives good results.

I agree with Naveen Answer

1. Adsorption and desorption  Performance of Acacia nilotica for the Removal of Cobalt(II) by Column and Batch Mode Study from Aqueous Phase and its

I agree with  Prof .Vernidra Kumar it surly depend on the type of wasted  water and tgpe of pollutants