REMOVAL OF ARSENIC FROM AQUEOUS

SOLUTION BY ADSORPTION WITH

ACTIVATED CARBON

GROUP MEMBERS:

Ajit Singh PatelKuldeep SinghReyad Ranjon Roy

BACKGROUND AND OBJECTIVE:

BACKGROUND:

Sources of arsenic

Why is its removal necessary?

Methods for removal

OBJECTIVE:

Removal of arsenic upto permissible limit.

Comparison of adsorption parameters

Study the effect of modification, pH, temperature and presence of co-ions.

Selection of efficient and economic method

METHODS:The following types of activated carbon were used for :

Adsorption capacity and Isotherm study

Kinetic study

pH change, temperature variation, presence of co-ions

Coal derived activated carbon modified with NZVI

Bituminous based, coconut coal and wood based activated carbon

apricot stone based activated carbon hybrid adsorbents

Activated carbons with iron hydro(oxide) nanoparticles

Biomass waste (bean pods) derived activated carbon

china calgon activated carbon

Darco and norrit activated carbon

Charcoal activated carbon

Activated carbon from fibre cloths

Activated carbon from pine wood sawdust

FINDINGS: modification of AC by iron gives higher removal and reduction in

regeneration frequency.

rapid adsorption and better removal efficiency by modification with Fe+3 than Fe+2.

amount of iron present in water affects adsorption capacity as when amount of Fe increases from 0 to 4.22% only then removal efficiency increases.

Oxidised AC gives very rapid and efficient removal upto less than 10 microgram/L As content.

the activated carbon, with higher value of ash content , was more effective in removing As(V) .

Biomass(bean pods) derived AC provides very cheap removal of As(III). This type of AC have higher efficiency than other for same specific Area .

Generally maximum adsorption capacity is found between pH 6-8 ,but bituminous waste and coconut husk based AC gives maximum adsorption capacity at pH 11.

coal derived AC which is modified with NZVI particles is superior for removal of As(III) in available pH conditions for natural water.

Charcoal based AC is found to be best for the removal of As(V) in pH range from 6 to 8.

SO42- and Cl- have more affinity to AC than arsenic. 

Presence of common divalent cation like Mg+2,Ca+2 and Fe+2 increases the removal % of arsenate whereas presence of Ag+ and Cu+ increases the removal % of As(III) but decreases the removal % of As(V) considerably .

Adsorption by Fe+2 modified AC is endothermic while Adsorption by Fe+3 modified AC is found exothermic in case of apricot based AC. Some AC shows insignificant change in adsorption capacity with temperature variation.

Issues and directions for further research

For economic new waste produced materials such as from nutshell, peat etc. should be used for the production of AC.

New modification method should introduce because Modified activated carbon has more adsorption capacity than virgin activated carbon.

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