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Wu J.,Jiangsu Academy of Environmental Sciences | Wu J.,Province Key Laboratory of Environmental Engineering | Zhao X.,Nanjing University | Zhao X.,State Key Laboratory of Pollution Control and Resource Reuse | And 15 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

A new technology of treatment and reutilization of waste hydrochloric acid containing Fe(II) by an oxidation-adsorption process was proposed. The suitable conditions of the oxidation process and the key parameters of the adsorption unit on the removal rate of iron ions were studied systematically. Experimental results show that using hydrogen peroxide solution as an oxidant will not introduce other pollution factors, and the optimized conditions of oxidation unit are that adding 1.2 times of hydrogen peroxide than Fe2+ concentration in mole, reacting for 2 h. The most of the iron ions in the post-oxidation waste hydrochloric acid was removed by a strong base anion exchange resin NDA900, the removal rate can reach 99.9% if using double-column fixed bed. The effluent can be reused in the pickling unit. Saturated resin can be regenerated using tap water. The concentration of FeCl3 in the regeneration solution is as high as 40~50 g/L, which can be used as a good flocculent in water treatment. This process is expected to achieve the comprehensive utilization of waste hydrochloric acid and Fe(II) contained in it. Source

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