The long-term operational stability, the water quality of reclaimed water, and the operational cost of a tertiary treatment process of municipal wastewater were investigated in a pilot-scale experiment (2.2 m3/d). It seems that organic matters, nitrogen and phosphorus in the secondary effluent were effectively and stabily removed, which produced quality reclaimed water. On the basis of 39 water quality indexes, the reclaimed water can meet the requirements of industrial uses, scenic environment use, groundwater recharge, urban miscellaneous water consumption and farmland irrigation, and was even comparable with the national surface water II standard. The dried product of spent regeneration contained nitrogen nutrient as high as agricultural fertilizer according to the relative national standards, which realized both pollution control and resource recovery. The operational cost of the tertiary treatment process was approximately 0.2 USD per ton of secondary effluent.

Pilot-scale investigation on the tertiary treatment process of municipal wastewater with nutrient recovery

248th National Meeting (2014)

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