(359f) Pilot Scale Evaluation of Nano-Size Adsorbent for Arsenic Contaminated Water Treatment

In order to investigate the arsenic removal by nano-size adsorbent in the pilot scale, a water treatment system with the capacity of 10 tons/d was designed in our study. The nature reservoir water contaminated by arsenic was sequentially treated by adsorption, coagulation, sedimentation and membrane filtration. A novel nanostructured zircomium-manganese binary oxide was added in the adsorption process, and Al₂(SO₄)₃ was chose as the coagulant. When the initial arsenic concentration was 100μg/L, only 2.5 mg/L adsorbent was needed to ensure the effluent safety. This system showed a good stability and the final concentration of arsenic and turbidity meet the WTO drinking water standard. The turbidity increased after the addition of adsorbent and coagulation, while through the sedimentation and membrane filtration the turbidity was decreased to below 1 NTU. Only a slight influence on the removal of As(V) was found in the study with the presence of the co-existing ions such as Cu²⁺, Pb²⁺, HCO₃^- and F^-.  The adsorbent dosage needed to be increased when a certain amount of As(III) existed in the influent. The toxicity of the effluent was analyzed by human cell lines. The results found the samples were cytocompatible without any toxic nature.