Disclosed are efficient municipal wastewater treatment apparatus and process characterized in that the nitrogen is removed by nitrification and denitrification reaction in the cyclic aeration reactor wherein Anaerobic state, Anoxic state and Oxic state are change into time concept in a single reactor, and the untreated organic materials are further removed by the 24-hour-continuous reactor.

 
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> Packings for liquid chromatography, process for preparing and usage

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