Volume No. 7 Issue No.: 2A Page No.: 851-862 Oct. - Dec. 2012

 

REMOVAL OF ANIONIC SURFACTANT SODIUM DODECYL SULPHATE (SDS) FROM AQUEOUS SOLUTION BY USING ALUMINA

 

Raval Priti V.* and Desai Hemangi H.

TIFAC Centre of Relevance and Exellence in Environmental Engineering, Sarvajanik College of Engineering and Technology, Athwalines, Surat (INDIA)

 

Received on : July 10, 2012

 

ABSTRACT

 

Surfactants are harmful to human beings, fishes and vegetation when present in water resources. They cause foaming in the aquatic media like river, ETP/CETP/STP. Surfactant also reduces the quality of water by giving high COD. In the present scenario, recycle and reuse of squander resources would be the best option to eradicate pollution from the surrounding environment. Adsorption is the best cost effective, less energy consuming, environment friendly technique when proper adsorbent is used to remove pollutants from the water/wastewater. In the present investigation, alumina was used as an adsorbent for the removal of anionic surfactant Sodium Dodecyl Sulphate from aqueous solution. The optimum SDS% removal (99.32% at 2000 ppm SDS ) and adsorption capacity (197 .7mg/gm at 20,000 ppm SDS) was found at pH 4, contact time 2 hr, adsorbent (i.e. alumina) dosage 100 gm/L. Adsorption phenomena were studied to interpret the adsolubilization pattern along with Thermodynamics and Chemical Kinetics studies. At 30°C temperature 98.9% removal of SDS and adsorption capacity 197.8 mg/gm was obtained at agitation time of 1 hr. Chemical Kinetic studies showed that the whole adsorption process follows pseudo second order kinetic with the calculated value of qe (196.07 mg/gm). Pseudo second order model is in good agreement with experimental qe value (197.7 mg/gm) with value of correlation coefficient R2 = 1 at agitation time of 1 hr. The value of intercept C i.e. 197.02 was found from intra particle diffusion model which also confirms the thickness of the SDS adsorption onto Alumina. Thus, from experiment results of the four techniques it is confirmed that Alumina exhibits adsorption capacity for SDS i.e. >197mg/gm. The data may be useful in designing and fabrication of an economic treatment plant for the removal of anionic surfactant from wastewaters in the detergent/soap manufacturing industries. By applying this technology we can prevent the introduction of surfactant into adjacent water resources. The natural water/wastewater/effluent can be treated by adding suitable dose of low-cost, adsorbent Alumina powder and by application of flocculator/other instrument with >100 rpm. Maintain pH 2-4, agitation time 1 hr and adsorbent dosage 50-100 gm for optimum results. The settled residue of SMA remained at the bottom of clarifier can be taken out by rotating scrapper with pump. Surfactant modified alumina, produced such as above mentioned way can adsolubilize toxic dyes, phenol, halogenated organics, etc. and can be removed from aqueous media without consuming much energy. The adsorbent can be recovered by giving NaOH treatment to the treated water.

 

Keywords : Adsolubilization, SMA, Anionic surfactant, Toxic pollutants, NaOH treatment

 

 

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