Abstract
The treatment of industrial wastewater containing Fe3+ by the new high efficiency compound flocculant MD-816 was discussed. The effects of flocculant dosage, pH value and stirring rate on the removal of COD, ammonia nitrogen and Fe3+ were discussed. The results show that when the dosage of flocculant is 200 mg.L-1, the pH of waste-water is 5, and the stirring rate is 250r/min, the removal efficiency of Fe3+ in industrial iron containing waste-water is better, the removal rate of Fe3+ is 99.99%, the mass concentration of Fe3+ is 0.043 mg.L-1, the removal rate of COD is 76.27%, the lowest is 51.16 mg.L-1, the removal rate of ammonia nitrogen is 93.28%, the lowest is 7.92 mg.L-1. The treatment effect meets the requirements of the maximum allowable discharge mass concentration (Fe3+ ≤ 0.1mg.L-1, COD ≤ 100mg.L-1, ammonia nitrogen ≤ 10mg.L-1) in the integrated waste-water discharge standard (GB 8978-1996).
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