A full decomposing model for industrial water use efficiency

Identifying drivers for industrial water efficiency can provide a scientific basis for industrial water conservation.The added value of water abstraction per ten thousand Yuan industrial outputs was used to measure industrial water use efficiency (IE).A new model was developed to quantitatively identify the drivers of IE using Logarithmic Mean Divisia Index (LMDI) method,including fresh water abstraction,water reuse and production process water use.The change of IE was decomposed into three drivers,i.e.,water reuse rate (P),water use efficiency in production process (IW) and industrial structure(S).The model was then applied to Shandong province and compared with the fresh[JP] water model.These two models were equivalent when water reuse rate did not change.The fresh water model could not reflect the effects of water reuse and cannot accurately attribute the contributions of different drives.In terms of contribution,IW was the dominant driver leading to the increase of IE, while P was the secondary driver and the contribution of S was very limited.The increasing IE during 2005 to 2010 was greatly reduced because the contribution of IW significantly decreased and the contribution of P changed from positive to negative.It should comprehensively increase the water reuse rate for the industrial sector in Shandong province,explore the water saving potential of high water consumption industries,optimize the industrial structure,and continue to reduce the proportion of highwater consumption industries.

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