Introduction: The materials from domestic and industrial effluents are discharged directly or indirectly into the aquatic ecosystem and environmental hazards are caused and it's inevitable to remove them. The adsorption method for removing surfactants using absorbent. The aim of this study was to evaluate the performance of Leca-modified as absorbent for the removal of SDS from wastewater.

Materials & methods: The study was conducted on a laboratory scale and uncontinually. To increase the efficiency of the adsorption, the absorbent was washed with HCl. The effect of parameters such as (3-11) pH, amount of adsorbent (0.5-3g/L), surfactant concentration (25-200mg/L) and contact time (15-120min) on Removal of surfactant was investigated. Then, by experiments on synthetic sample, the optimum conditions with real wastewater sample was performed. Surfactant concentration is measured by a spectrophotometer.

Findings: The maximum adsorption of surfactant by Leca-modified under optimum conditions (contact time of 60 min at pH 3, the amount of 2.5g/L of absorbent and initial concentration of surfactant is 100mg/L) in synthetic solution SDS was obtained in the rate of 77%  and in the same conditions it was 65% at the real sample. Removal efficiency decreased with increasing initial concentration of surfactant. Langmuir Isotherm (R2=0.96) and the first synthetic adsorption  had the most consistency with the results indicated in this study.

Discussion & Conclusion: The results showed that Leca-modified with HCl can be used as a low cost and effective adsorbent for  removal anionic surfactants from aqueous solutions.

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