Based On The Pinch Technology Process Industry Wastewater Minimize Model Development

Industrial water accounts for about a quarter of the total water in China. Industrial water reuse and wastewater minimization technology makes great sense and it is the focus of the world's attention. Process industry not only consume large amounts of fresh water, but emit a considerable amount of wastewater, which is an important source of natural discharges of pollutants. In recent years, increasing pollution and waste of water resources has become a problem of our economic development problems. It also made for industrial process water-saving abatement requirements.Against this background, this paper tries to optimization design to water-using network on the production system. Water system integration, which treats the water utilization processes in an enterprise as an organic whole to consider how to allocate water in a water system, shows remarkable effectiveness in saving water. On the basis of summing up the results of relevant research about process integration technology, water-pinch technology in process integration technology is applied to water-using network of Process industry production. Process integration technology for the study of water conservation abatement provided technical support and systematic approach. It has made some progress in the research process. But in actual industrial production, many problems remain to be to find and solutions to complex system applications that have certain difficulties. Application of water-point technology can effectively conserve fresh water consumption of industrial processes and significantly reduce wastewater emissions. Water pinch technology is one of water system integration technologies which is used in water-using network optimal design to improve the level of wastewater reuse.The main contents of this paper are as follows:1. From the viewpoint of systems engineering, in this model, water conversion, utilization and wastewater reclamation and regeneration have been considered systematically. Based on the quantitative analysis and evaluation for the water utilization process, the direction of integrated optimization and improvement for water use is pointed out. The optimization objectives and corresponding optimization strategies are proposed, which can provide guidance for water-saving and drainage-reduction. Some feasible technologies on water-saving are discussed, which is helpful to optimize water utilization systems as a whole.2. This paper discusses the model reduction of waste water and connection relations between the constraints. Water systems based on the flow structure model, revealing the common law of the process water, as well as the various links (subsystem) and the entire system of water mass balance equation, to clarify the water in every aspect of the composition, characteristics, roles, and between loss of relations linking constraints. On the basis of the process of integration of the basic concepts and related principles are described.3.The principles of water pinch technology is introduced, minimum fresh water consumption pinch can be found with the water pinch technology, and mathematical mothed is brought in to distribute water resource, and design the optimal water-using network. Formulated the C-M figure with water pinch point technique for designing water system, the structuring principle of composite concentration curve , principle of designing water pinch point and the procedure to design water system. The advanced and practical features of the design method of water system pinch point have been perfected and verified through engineering application. Last, the method was applied to analyze an example, the effect was obvious in water saving, and discusses on the main way of water-pinch technology approach.4. Based on the water pinch analysis, a super structure of water utilization networks can be built which involves only feasible and better retrofit options. Then an improved mixed integer nonlinear programming (MINLP) model for the network super structure is proposed which considers the fresh water usage, wastewater discharge and reuse of process. The corresponding mathematic model involved a set of nonlinear equations is solved by the GAMS (general algebra model system) software tool. This method could achieve minimal fresh water use and optimal network assignments simultaneously.