Notice of RetractionEffect of diatomite on enhanced coagulation for micro-polluted water from Huaihe river

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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Conventional coagulation is not an effective treatment method to remove natural organic matter (NOM) and ammonia nitrogen (NH₃-N) in water at low temperature. For this type of water, enhanced coagulation is currently proposed as one of the feasible treatment methods and is implemented by coagulant optimization based on raw water characteristics and the coagulant aids. NOM and NH₃-N removal from Huaihe river water have been studied through an enhanced coagulation process with polyaluminum chloride (PAC), polyacrylamide (PAM) and diatomite (100-120μm) in this work. The effectiveness of the tested coagulants was evaluated by measurements of turbidity, COD_Mn UV₂₅₄ and NH₃-N. The diatomite, PAC and PAM combination of enhanced coagulation was presented, and results showed that: when 100 mg/L diatomite, 30 mg/L PAC and 0.6 mg/L PAM were added, the removal efficiency of turbidity, NH₃-N, COD_Mn and UV₂₅₄ were respectively 98.5%, 35.9%, 48.8% and 49.4%, and the removal rates were increased by 3.7%, 14.2%, 14.3% and 19.1% compared with single dosing PAC (30 mg/L). The experiment results can act as a reference for the optimization of the process of coagulation.