Studies And Countermeasures On Optimization Of Water Cycle Within Shijiazhuang Circular Economy Chemical Demonstrative Base

Shijiazhuang Circular Economy Chemical Demonstration Base ("Shijiazhuang Chemical Base"for short)is a Key Industries Demonstration Zone of Hebei province. 8,000,000 ton refinery project as a leader, forming the"combination of the three chemical"product chain of petrochemical, coal chemical and chlor-alkali chemical and so on, is possessed of very strong market competitiveness. However, the location of Shijiazhuang Chemical Base is of severe water shortage, so the Base's development is facing the contradiction problem of water resources supply and demand that is more prominent. At present, the level of water recycling across the region is not high, simultaneously there is a lack of unified planning and technical support in water resources regulation. As a result, for the water and drainage situation of Shijiazhuang Chemical Base, it is necessary to optimize the allocation of water resources, to propose policies and technical safeguards, to enhance the Base market competitiveness, and to promote the Base sustainable development.This study analyzes the major constraint problem about the utilization of water recycling, which was focusing on the investigation of current water resource situation in Shijiazhuang chemical base. From the perspective of water recycle optimal allocation, the optimization strategy named"three-circulation integration"is proposed in terms of efficient use of water resources. Through the technical and economic feasibility analysis, the best available technology is selected to improve the utilization rate of water recycle, Also the overall optimization plan of Shijiazhuang chemical base water recycle is proposed. At the same time, after the implementation of the overall optimization program, this paper evaluated the expected result, economic benefit, environmental benefit and social benefits and so on.The research results were as follows:(1) By analyzing the current water resources situation of Shijiazhuang Chemical Base, the overall water requirement of enterprises would reach to 108,000 m₃/d and the water discharge of enterprises would reach to 26,000 m₃/d. The shortage of fresh water would be 20,000 m₃/d, so the requirement of sewage treatment load still would be up to 12,000 m₃/d. The main factor of constraint the Base's economical development is water shortage, so it is extremely urgent to find alternative water resources or to increase the utilization rate of water recycle.(2) As for the water resources of Shijiazhuang Chemical Base, this paper proposed the water circulation optimization strategy of"three-circulation integration"from the level of enterprises, base and regional,that is, water recycling of enterprises internal, water reuse of Base water discharge, the water resources development plan in the region and made use of wastewater resources, as well as integrated configuration and management of water resources.(3) As for the water resources of enterprises themselves, it proposed to reduce process water, implemented recycling water conservation and water networks, which would achieve 22,000m₃/d in water conservation. For water situation of enterprises, it proposed technical route that wastewater reuse in cooling water, implemented wastewater reclamation and water quality stability of recycled water and so on,These technologies would achieve 11,000m₃/d in water reclamation and reusing. For the new water situation in the base,it proposed technical route that municipal sewage reuse in industrial cooling water or boiler water,which can conserve consumption of fresh water up to 50,000 m₃/d.(4)After the implementation of recycling water optimization program in Shijiazhuang Chemical Base, it hoped that fresh water consumption would be reduced from 108,000 m₃/d to 25,000 m₃/d, reduction rate up to 76.9%, and wastewater would be reused totally and realize zero discharge. Meanwhile, comparing with prior to implementation, the water resource production rate of Shijiazhuang Chemical Base would raise from 1,320 Yuan/m₃ to 1,848 Yuan/m₃, the quantity of water demand per GDP would reduce from 7.56 m₃ /ten thousands Yuan to 5.4 m₃ /ten thousands Yuan, water consumption of per ton fuel would reduce from 0.57 m₃ to 0.39 m₃ and sewage discharge of per ton fuel would reduce from 0.11 m₃ to 0.05 m₃ in the key products. The implementation of project would bring much more economic, social and environmental benefits.