Water Footprint Accounting Analysis Of Chemical Products For Chlor-Alkali Production Chain

Shortage of freshwater resources is a major condition in our country. With the further development of industrialization and urbanization and impacts of global climate change, China’s water resources, water ecology and water environment are facing more severe situations. The urgency of water crisis increasingly attracts everyone’s attention. In 2011, Document No.1 of the central government proposed the "three red lines" of water resources management to change the current situation of over-exploitation, waste water and water pollution and ensure community water security.The scientific and rational water management models and methods are the important foundation for achieving sustainable development and utilization of water resources. As water footprint is a multidimensional indicator, showing water consumption volumes by source and polluted volumes by type of pollution. It can provide new ideas and directions for sustainable water resources planning and management industry.In this thesis, taking a chlor-alkali enterprise as the case, the composition of water footprint in the production process is analyzed. water footprint accounting model of chemical products is proposed. And the water footprint of each chlor-alkali chemical product is abtained according to the accounting models. The water footprint of caustic soda and poly vinyl chloride are 15.61m3/t,26.05m3/t, respectively. The results show that water footprint of caustic soda and polyvinyl chloride (PVC) account for the largest proportion in the chlor-alkali industry chain. Further, the thesis make a sustainability assessment for water footprint of chlor-alkali products. The results show that only the unsustainable proportion of caustic soda and polyvinyl chloride accounts for more than 80%.According to the sustainability criteria of the product water footprint, the thesis analyzes the current situation of water resources utilization Basin of Xinjiang and reveals that the caustic soda and PVC water footprint of the company in Xinjiang is not sustainable. In order to achieve automation and simplified of footprint accounting and evaluation, the paper constructs decision support systems of water footprint and implements a preliminary evaluation of water footprint accounting. Finally, combined with accounting data of water footprint and actual operation of the corporate, it presents feasible and effective water conservation programs to improve water efficiency, improve water management and promote sustainable development of the chlor-alkali industry, which is according to the large water and energy consumption sectors.